The application and market status of talc
The molecular formula of talc is Mg3Si4O10(OH)2, and the chemical name is hydrated magnesium metasilicate, monoclinic system. The theoretical composition of pure talc is 63.47% SiO2, MgO 31.68%, H2O 4.75%.
The properties of talc: pure talc is white or slightly yellowish, pink, and light green; generally dense block, leaf-like, fibrous or radial aggregates; glassy, translucent; hardness 1.0, specific gravity 2.58~ 2.83, melting point 800°C. Because talc is white in color, soft, odorless, tasteless, stable in chemical properties, it has high stability, low conductivity, fine particles, and has the advantages of flake structure and large specific surface area.
Types of talc deposits
According to the geological origin, it is mainly divided into carbonate hydrothermal metamorphic type, contact metamorphic type, sedimentary dynamic metamorphic type and ultra-basic hydrothermal metamorphic type.
According to the type of ore-forming parent rock, it can be divided into four types: magnesia carbonate, serpentinite, siliceous rock/aluminous rock and magnesia sedimentary rock.
According to the type of ore, it can be divided into four types: lump talc, flaky soft talc, tremolite talc and mixed talc.
The prospective reserves of talc in the world are more than 2 billion tons, and the proven reserves are about 800 million tons. Global talc (including pyrophyllite) deposits are distributed in more than 40 countries and regions, mainly in the United States, Brazil, China, India, France, Finland and Russia.
The main application of talc
- Papermaking
Talcum powder has a special layered structure with softness, hydrophobicity, strong adsorption and other characteristics. The addition of talcum powder in the paper industry can help increase filler retention and improve paper transparency, smoothness and printability, and make paper Has high ink absorption. It is lipophilic and can absorb organic substances to keep the white water and slurry system clean. As a filler, it also has the effect of eliminating resin barriers.
- Plastic
Talc is an important filler for plastics. It can improve the chemical resistance, heat resistance, impact strength, dimensional stability, firmness, hardness, thermal conductivity, tensile strength, creep resistance and electrical insulation of plastics. . At the same time, it is also a reinforcing agent for many thermoplastics, which can control the rheology of the melt, reduce the creep of molded products, increase the cycle of molding, and improve the heat deflection temperature and dimensional stability. When flake talc was used at that time, it had a good lubrication effect on the parts of the molding press.
- Ceramics
The reason why ceramics show different colors is that talc powder is added to them. Different proportions and different composition ratios can make the ceramics show different colors. At the same time, it can make the ceramics have uniform density, smooth surface and good gloss after calcination.
- Coating
Talcum powder has good suspension and dispersibility, and low corrosiveness. Therefore, in coatings, talc powder can be used as a filler and a skeleton function, which reduces manufacturing costs, and at the same time can increase product shear strength, pressure strength and Tensile strength reduces its deformation strength, elongation and thermal expansion coefficient.
- Cosmetic
Talc is a high-quality filler in the cosmetics industry. Due to its high content of silicon, it has the effect of blocking infrared rays, enhancing the sun protection and anti-infrared properties of cosmetics. In addition, because talc powder has the properties of lubrication, softness, and hydrophilicity, various emollient powders, beauty powders, talcum powders, etc. are commonly used.
- Cable
In the wire industry, special talc powder is mainly divided into two types: rubber sheathed cable-filled talc powder and special peeling talc powder for sheathed insulated wires. Lubrication and insulation.
- Roofing, waterproof material
Talc can be used not only as a filler for roofing materials, but also as a surface material for roofing materials. When used as a filler, talc acts as a stabilizer in the molten asphalt component, which can increase the stability of the roofing material and the ability to resist weathering. When talc is sprayed on the surface of asphalt shingles or rolled roofing materials, it can prevent the materials from sticking during production and storage.
- Textile
Superfine ground talcum powder is often used as a filler and bleaching agent in some textiles, such as tarps, fireproof cloths, wheat flour bags, rope nylon, etc., which can enhance the compactness of plants, and enhance heat resistance and acid and alkali resistance Performance.
- Medicine and Food
Talc powder is often used in medicine and food because of its non-toxic, tasteless, good solubility, high whiteness, strong smoothness, and soft taste. For example, it can be used as pharmaceutical tablets, sugar coatings, Chinese medicine prescriptions, prickly heat powder, and food additives. , Release agent, etc.
- Other apps
Treatment of oily wastewater to reduce water pollution hazards. It can also be used in metal smelting, building material modification, pesticide absorbents, making overall foamy latex boards, and manufacturing floor waxes, bleaches, anti-corrosion compounds, and lubricants , Joining fillers, etc.
The market status of talc
The annual output of talc in the world in recent years is about 6 million tons. From 2016 to 2018, the international trade volume was 2.87 million tons, 3 million tons, and 2.98 million tons, accounting for about 50% of the total output.
From the perspective of the export market, China is the world's largest exporter of talc. However, in recent years, due to the impact of environmental protection and rising labor costs, the export price of talc has increased year by year. The Netherlands, Germany, the United States, Japan, and South Korea are the largest importers. The United States, China, Austria, and Italy are importing countries as well as producing and exporting countries.
Consumption profile of talc
In recent decades, the formulation of tiles and sanitary ware and the technology of burning tiles have changed, reducing the amount of talc required for the manufacture of ceramic products. In coatings, the industry has shifted its focus from oil-based coatings to water-based coatings. Talc is hydrophobic and not suitable for the production of this product.
In the 1990s, papermaking began to decrease, and some talcum powder used for pitch adjustment was replaced by chemicals. In cosmetics, talcum powder manufacturers have shifted the production of some products from talcum powder to corn starch.
The paper industry used to be the world's largest consumer market for talc. As paper mills used a large amount of calcium carbonate instead of talc for papermaking, the global talc consumption structure center gradually shifted from the papermaking market to the plastics market. It is expected that in the next few years, the world's talc production and demand will grow steadily. The consumption of talc in the plastics sector will exceed that of the paper industry. As the automotive industry develops in the direction of lighter weight, the demand for automotive plastics will further increase in the future. Thereby driving the growth of the amount of talcum powder used in automobiles.
Article source: China Powder Network
The role and types of grinding media of ball mill
The function of the grinding body in the ball mill is to crush and grind the bulk materials fed into the mill into fine powder. The particle size of the material that has just entered the mill is about 20mm, and it will eventually be ground into a fine powder below 0.08mm (generally, the sieve residue should not exceed 15%). The grinding body mainly impacts the newly fed bulk materials (in the coarse grinding chamber), and grinds them as a supplement. During this period, collisions between the grinding bodies are unavoidable. The strong sound when the mill is running mainly comes from the coarse grinding chamber. As the particle size of the material decreases, it will flow to the next silo, the grinding body will turn to be mainly grinding, the sound will gradually weaken, and it will be sent out of the grinding mill after being finely ground. Different types and specifications of grinding bodies are used in different grinding chambers.
①Steel ball: a kind of grinding body widely used in ball mills. It comes into contact with the material during the grinding process and has a large impact on the material. It is mainly used in a warehouse (the feed end is also a coarse grinding warehouse) and a double warehouse. Two chambers (coarse and fine grinding chambers) for closed-circuit mills, one and two chambers for tube mills. The diameter of the steel ball is between Ф15~125mm. According to the requirements of the grinding process, the coarse grinding chamber generally selects Ф50~110mm, and the fine grinding chamber uses various specifications of Ф20~50mm.
②Steel section: In the fine grinding chamber of the mill, the material is mainly ground. The steel (iron) section can replace the steel ball. Its shape is short cylindrical or truncated cone. It has line contact with the material and has a strong grinding effect. But the impact is small, so it is more suitable for the fine grinding chamber.
③Steel rod: Steel rod is a kind of grinding body commonly used in wet grinding, with a diameter of Ф40~90mm, and the length of the rod is 50~100mm shorter than the length of the grinding chamber.
Regardless of the type of abrasive body, it has high requirements for its material: it must have high wear resistance and impact resistance. The quality of its material affects the grinding efficiency and the operation rate of the mill. The material is required to be hard, wear-resistant and not easy to break. For example, high chromium cast iron is an alloy white cast iron with high chromium content, which is characterized by wear resistance, heat resistance, corrosion resistance, and considerable toughness. Low chromium cast iron contains less chromium elements, and has higher toughness. Chromium cast iron is poor, but has good wear resistance. It is suitable for use as the liner of small balls, iron sections and fine grinding chambers.
Factors affecting the efficiency of cyclone dust collector
The cyclone dust collector enters the dust collector from the tangential inlet. The airflow rotates in the dust collector. The dust particles in the airflow move to the outer wall under the action of centrifugal force, reach the wall surface, and move along the wall under the action of the airflow and gravity. The wall falls into the ash hopper to achieve separation. There are several factors that affect the dust removal efficiency of the dust collector:
1. Air inlet area: The air inlet is an important part of the dust collector, and it also affects the efficiency of dust removal. The smaller the air inlet area, the higher the air velocity and the higher the dust removal efficiency, which is beneficial to the separation of dust and other things;
2. Inlet wind speed: Generally, the inlet wind speed is maintained at 12-25m/s. When it is lower than 12m/s, the dust removal efficiency will decrease. When it is higher than 25m/s, the dust removal efficiency will not increase significantly, but the resistance loss will increase and energy consumption will increase. . The higher the wind speed in this range, the greater the resistance and the higher the dust removal efficiency;
3. The diameter and height ratio of the cyclone cylinder affect the efficiency of the dust collector: at the same tangential speed, the smaller the diameter of the cylinder, the greater the centrifugal force and the higher the dust removal efficiency. If the diameter of the cylinder is too small, the particles will easily escape, and the dust removal efficiency will be lower. Therefore, the diameter of the air inlet of the dust collector is not easy to be too large, just appropriate, and the near air port cannot be too small. When the dust particles are large, it is easy to block the air inlet;
4. Properly lengthening the cone of the cyclone dust collector is also beneficial to improving the dust removal efficiency;
5. The influence of the diameter and depth of the ash discharge port: the smaller the diameter of the ash discharge port, the smaller the airflow, and the greater the difficulty of dust discharge, so the speed and diameter of the outlet air discharge should be accelerated;
6. Tightness of the lower part of the dust collector: Generally, there are two types of double flap valves or star-shaped unloaders for the air lock device at the lower part of the dust collector. The static pressure inside the precipitator gradually decreases from the outer wall to the center. Even if the precipitator is under positive pressure, the bottom of the cone may be under negative pressure. Air leakage from the lower part of the dust collector will take away the dust falling into the ash hopper again, which will significantly reduce the dust removal efficiency. When the air leakage reaches 15% of the air volume processed by the dust collector, the dust removal efficiency is almost reduced to zero;
7. Gas temperature: The gas viscosity increases as the temperature rises, so that the centripetal force on the dust particles increases, and the separation efficiency decreases. Therefore, the dust collector efficiency of the cyclone dust collector decreases with the increase of the gas temperature or viscosity.
Introduction & advantages of ball mill
The ball mill is the key equipment for grinding materials after being crushed. This type of grinding machine is equipped with a certain number of steel balls as grinding media in its cylinder.
It is widely used in the production of cement, silicate products, new building materials, refractory materials, fertilizers, ferrous or non-ferrous metal beneficiation, and glass ceramics. The ball mill is suitable for grinding various ores and other materials. It is widely used in mineral processing, building materials and chemical industries. It can be divided into dry and wet grinding methods. According to different ways of discharging, it can be divided into grid type and overflow type.
The ball mill is mainly composed of a cylindrical barrel, an end cover, a bearing, a large transmission gear ring and other components. The barrel is filled with steel balls or steel bars with a diameter of 25-150mm, which is called a grinding medium, and its loading is the entire barrel. 25%-50% of effective volume. There are end caps at both ends of the cylinder. The end caps are connected with the flange at the end of the cylinder by bolts. There is a hole in the middle of the end cap, which is called a hollow shaft. The hollow shaft is supported on bearings and the cylinder can rotate. A large gear ring is also fixed on the cylinder. In the drive system, the electric motor drives the large gear ring and the cylinder through the coupling, reducer and pinion to rotate slowly. When the cylinder rotates, the grinding medium rises to a certain height with the cylinder wall, and then falls in a parabola or cascade down. Because there is a hollow shaft on the end cover, the material is fed into the cylinder from the hollow shaft on one side, and gradually spreads and moves to the other side. During the movement of the material, the rotating cylinder brings the steel ball to a certain height and falls to hit the material. While a part of the steel balls in the cylinder body in a cascading state have a grinding effect on the material, the entire movement process is also the grinding process of the material.
The advantages of the ball mill are:
1. Stable operation and reliable work;
2. The use of materials and processing techniques with excellent performance extends the service life of main components;
3. Use three-dimensional design and simulation to optimize the design to make the equipment more cost-effective;
4. A variety of equipment types to meet the needs of different production processes.
Types and materials of ball mill steel balls
The ball mill is the key equipment for grinding after the materials are crushed. It is the core machine in many industries such as cement and chemical industry. The steel ball components occupies an important position in the ball mill equipment, which drives the operation of the whole machine and affects the production volume.
Types of ball mill steel balls
1. Forged steel balls: use better wear-resistant materials, such as 60Mn, 65Mn, which have the characteristics of good quality, good impact resistance, strong toughness, and good wear resistance.
2. Cast steel balls: The production of cast steel balls is relatively simple, and the production investment is small. It has the characteristics of low energy consumption, high impact toughness, flexibility, etc., and because the operation is easy to master, it has won the favor of the majority of users.
3. Hot-rolled ball-milled steel ball: It has the characteristics of good forming, small geometric tolerance and stable quality. The wear rate is low, the service life is 2 to 5 times that of the existing cast iron balls and forged steel balls, and the price is moderate.
Ball mill steel ball material
1. High manganese steel: This material has good toughness, good manufacturability, and low price. Its main feature is that under the action of greater impact or contact stress, the surface layer will quickly produce work hardening, and its work hardening index is higher than other materials 5-7 times, the wear resistance is greatly improved.
2. Low-carbon alloy steel ball: The steel ball made of low-carbon alloy has good toughness and low price. Under the same conditions, its service life is more than twice as long as that of low-chromium cast balls.
3. High chromium cast iron: a wear-resistant material with excellent abrasion resistance, but low toughness, brittle fracture, and expensive.
4. High-carbon and high-manganese alloy steel: The material is mainly alloy structural steel containing chromium, molybdenum and other elements, with high hardness and good toughness. Under the same working conditions, its service life is more than twice that of high manganese steel balls.
Daily maintenance and dust removal of bag pulse dust collector
During the trial operation of the new bag filter, special attention should be paid to check the following points:
1) The direction of rotation, speed, bearing vibration and temperature of the fan.
2) Whether the disposal air volume and the pressure and temperature of each test point are consistent with the design.
3) The device status of the filter bag, whether there is any occurrence of bag drop, loose mouth, abrasion, etc. after use, can be judged by visual inspection of the discharge status of the chimney after it is put into operation.
4) Pay attention to whether there is condensation in the bag room and whether the ash discharge system is unblocked. Avoid infarction and corrosion attacks. When the fouling is serious, it will affect the efficiency of the host.
5) Adjustment of the cleaning cycle and cleaning time. This work is an important factor affecting the performance and operation of dust collection.
6) If the cleaning time is too long, the attached dust layer will be removed, which will be the cause of leakage and damage of the filter bag. If the dust removal time is too short and the dust on the filter bag has not yet been removed, the filter operation will be resumed. The resistance will quickly recover and gradually increase, which will ultimately affect the application effect. At the beginning of the operation, some unexpected conditions are often present, for example, abnormal temperature, pressure, moisture, etc. will cause damage to the new installation.
The test operation of the equipment directly affects whether it can be put into normal operation. If it is not handled properly, the bag filter may quickly lose its efficacy. Therefore, it is necessary to be careful and cautious to do a good job in the test operation of the equipment.
- Frequently check the operation status of control valves, pulse valves and timers, etc.
The failure of the impulse valve rubber diaphragm is a common phenomenon, which directly affects the cleaning effect. This equipment belongs to the external filter type, and the bag is equipped with a skeleton. It is necessary to check whether the parts fixing the filter bag are loose, whether the tension of the filter bag is appropriate, and whether the supporting frame is smooth to avoid abrasion of the filter bag. Compressed air is used for dust removal, so oil mist and water droplets need to be removed, and the oil-water separator must be cleaned frequently.
- Avoid condensation
During use, it is necessary to prevent the gas from cooling below the dew point in the bag chamber, especially when using the bag filter under negative pressure. Because the shell often leaks air, the air temperature in the bag room is lower than the dew point, and the filter bag will be damp, causing dust to adhere to the filter bag, blocking the fabric holes, resulting in a cleaning failure, and causing a pressure drop in the dust collector If it is too large, it cannot continue to operate, and some generate paste bags and cannot remove dust.
To avoid condensation, the temperature of the gas in the dust collector and its system must be 25～35℃ higher than the dew point (such as the dew point temperature of the kiln-grinding integrated machine is 58℃, and the operating temperature should be above 90℃) to ensure Good use effect of filter bag.
Maintenance measures of ball mill
The maintenance of the ball mill is a must for the operator. The formulation of reasonable maintenance measures is the key method to prolong the service life of the ball mill, increase the production capacity and reduce the failure rate, and it is also a direct method.
- Keep the equipment clean
Cleaning work is a must for the ball mill. Only by removing all the impurities inside and outside the machine can the normal operation of the equipment be ensured. If there are too many impurities, not only will it be difficult to start the equipment, but also the phenomenon of grinding and poor output will occur. The key is to cause damage to the equipment to a certain extent. It is recommended to clean the ball mill regularly, such as the base. When there are too many impurities in the base, it is easy to rust. Therefore, the impurities should be removed first, and the base should be cleaned.
- Reasonable lubrication
After the ball mill is used for the first time and continuously operated for one month, the lubricating oil must be replaced once (select the correct lubricating oil). When replacing, all lubricating oil must be removed, and the ball mill should be cleaned, and then replaced with new lubricating oil. In the subsequent use of the ball mill, the lubricating oil must be replaced every six months of operation. When it is found that there is too much oil shortage, the cause should be analyzed in time. At the same time, the lubrication of each lubrication point should be strengthened. It is recommended to add grease to the lubrication point every week during the running-in period, except for special requirements.
- Periodic inspection
Regularly check and repair all parts of the ball mill, so that not only the abnormalities and problems of the machine can be found in time, but also the occurrence of failures can be prevented. At the same time, the ball mill will be maintained. For example, check whether there is oil leakage on the joint surface, whether there is water leakage and whether there is a leakage phenomenon, and determine the use state of the fastener. Especially for some vulnerable parts, the frequency of inspection and timely maintenance and repair should be strengthened to extend the service life of the parts and increase the service life of the ball mill.
Factors affecting the output of ball mill
Ball mill is a commonly used grinding equipment, and the output is an important indicator to measure the quality of the ball mill. So what are the factors that affect the output of the ball mill?
1. The volume of the mill. Under normal circumstances, the larger the volume of the mill, the greater the processing capacity.
2. What is the water content of the material? If the water content of the material is too high, it will affect the uniformity of the feeding and make the feeding time too long. Secondly, if the wet material is fed too much, it may cause the phenomenon of "sticky grinding". Therefore, the moisture of the feed is usually required.
3. Loading capacity of grinding body. After the mill runs for a period of time, the output will become lower and lower. This is because with the impact and grinding of the grinding body in the cylinder, the grinding body will wear out, so the grinding body must be refilled in time. But it is not that the more abrasives, the better. If the steel balls accumulate too high, the impact of the steel balls on the material will be slowed down, and on the contrary, the grinding output will be reduced.
4. Grinding time. If the grinding time is too short, it will cause insufficient grinding of the material. In addition, starting the mill frequently will shorten the service life of the equipment. If the grinding time is too long, the temperature in the cylinder will increase, which will affect the grinding efficiency.
5. The ball mill is "full grinding". After the ball mill has been running for a period of time, due to the excessive feed of the ball mill or the increase in the particle size of the material, or the excessive moisture of the material entering the mill, the grate gap of the grate plate will be blocked, which will cause the material in the mill to be unable to be discharged out of the mill in time, and "saturated grinding" "The phenomenon affects the output of ball mills. In this case, it is necessary to adjust the materials, clean the grate seams, and increase the ventilation in the mill.
6. Adding ratio of grinding aid. Grinding aids can promote the grinding of materials, but most of the grinding aids are substances with strong surface activity and are not suitable for all materials, so the amount of grinding aids added should meet a certain proportion.
When the output of the ball mill is found to be lower and lower during the production process, it should be investigated in turn to find out the problem and resume production as soon as possible.
Why should talcum powder be surface modified
Talc has a wide range of applications in various industries. As an inorganic filler, it can improve the rigidity, strength, hardness, and lubricity of products. With the development and needs of modern industry, higher and higher requirements are put forward for the performance of talc, especially the demand for ultra-fine talc in the domestic and foreign markets.
Why should talcum powder be surface modified?
Like other non-metallic mineral powder materials, the surface organic treatment of talc is very necessary. This is because the surface of talc powder contains hydrophilic groups and has high surface energy. As inorganic fillers and organic polymer molecular materials, there are great differences in chemical structure and physical form, lack of affinity, and need Surface treatment of talc particles is carried out to improve the interfacial bonding force between the talc powder and the polymer, and to improve the uniform dispersion and compatibility of the talc powder particles and the polymer.
In addition, when ultrafine talc is applied to coatings, due to its large surface area, more wetting dispersions are needed, which is difficult to disperse and affects the performance of coatings. Nowadays, some talcum powders with high oil absorption in latex paints are not processed by many manufacturers or only simple surface treatments, so its application is greatly restricted.
Surface modification method of talcum powder
The mechanism of talc modification is to use some small molecules or polymer compounds with amphoteric groups to modify the surface of one or two of the materials to be composited, with the purpose of better combining the two materials.
Product features of talc modifier
Talc modifier is a low molecular weight polymer, which integrates the functions of grinding aid, modification, lubrication, coupling, dispersion, etc. Each molecule has multiple amphiphilic groups, and its adsorption on the surface of inorganic powder is Part of the amphiphilic group faces the surface of the inorganic powder, and the other part faces the oily solution, and associates with the solution through intermolecular force or hydrogen bond, thereby forming a three-dimensional barrier to prevent particle contact and agglomeration, and play a role in inter-particle dispersion.
Talc modifier has excellent modification, grinding aid, dispersion and coupling effects, which can greatly reduce the oil absorption of the powder, and make the powder have hydrophilic and lipophilic characteristics, and improve the compatibility with the resin system, so as to achieve Low-viscosity processing requirements in plastic and rubber production.
(1) Surface coverage modification method
The surface coating modification method is to cover the surface of the particles with a surfactant or talc modifier, so that the surfactant or talc modifier is combined with the particle surface by adsorption or chemical bond, giving the particles new properties and making the particles The compatibility with the polymer is improved.
(2) Mechanochemical method
This method uses grinding, friction and other methods to make relatively large particles smaller, so that the surface activity of the particles becomes larger, that is, the surface adsorption capacity is enhanced, the process is simplified, the cost can be reduced, and the quality of the product is easier to control.
Why should calcium carbonate be surface modified
Surface modification is an important means necessary to improve the application performance of calcium carbonate, improve applicability, expand the market and consumption. In the future, functionalization and specialization will become the main trend of calcium carbonate development, and the market demand for various surface modification special calcium carbonate The amount will get bigger and bigger.
Why should calcium carbonate undergo surface modification?
- Improve the dispersibility of calcium carbonate
Ultra-fineness is an important way to improve the quality of calcium carbonate, but the smaller the particle size of calcium carbonate, the higher the surface energy, the stronger the adsorption, and the more serious the agglomeration phenomenon.
Through surface modification, the modifier can be oriented to adsorb on the surface of calcium carbonate, so that the surface has charge characteristics. Due to the repulsion of the same kind of charge, calcium carbonate is not easy to agglomerate, thereby achieving good dispersion in the matrix.
- Improve the compatibility of calcium carbonate
Through surface modification, the interface compatibility and affinity between calcium carbonate and organisms can be increased, thereby improving its product performance with rubber or plastic composite materials.
- Reduce the oil absorption value of calcium carbonate
Surface modification is an important means to reduce the oil absorption value of powder. After the surface modification of calcium carbonate, the aggregated particles are reduced, the degree of dispersion is improved, and the gap between the particles is reduced. At the same time, the coverage of the surface of the calcium carbonate by the modified molecules reduces the voids in the particles, and this coverage also changes the calcium carbonate. Its surface properties weaken its surface polarity, the friction between particles becomes smaller, and the lubricity becomes better, so the packing becomes tighter, the packing density increases, and the oil absorption value decreases.
- Broaden the high-end application market of calcium carbonate
Calcium carbonate without surface modification has poor compatibility, is easy to agglomerate, and has poor application effects, and these shortcomings become more obvious as the dosage increases.
Through surface modification, calcium carbonate has good interface affinity and reduced oil absorption. It can be better applied to high-end fields such as plastics, coatings, rubber, paper making, sealants, and breathable membranes to improve product quality and further reduce application companies’ Cost of production.
- Give calcium carbonate more functional properties
Calcium carbonate without surface modification can only be used as a traditional filling material, and its application field and dosage will be subject to certain restrictions. Through surface modification, calcium carbonate becomes a multifunctional modifier.
Calcium carbonate coated with silica on the surface can partially replace white carbon black and supplement the shortcomings of white carbon black in certain properties; light calcium carbonate coated with metal on the surface can improve certain special properties of rubber products; The calcium carbonate composite material coated with titanium dioxide can replace titanium dioxide to a certain extent; it can be treated with phosphate, aluminate, silicate or barium salt to prepare acid-resistant calcium carbonate.
- Increase the added value of calcium carbonate products
At present, my country's ordinary calcium carbonate has overcapacity, and competition for low-price products is fierce. After surface modification of calcium carbonate, the use effect is significantly improved, the user experience is good, and the product price naturally increases.