Calcium carbonate, CaCO₃, is an inorganic compound, also known as limestone, marble, etc. Calcium carbonate is neutral, basically insoluble in water, soluble in hydrochloric acid. It is one of the common substances on the earth, found in rocks such as aragonite, calcite, chalk, limestone, marble, etc., and is also the main component of animal bones or shells. Calcium carbonate is an important building material, widely used in industries such as papermaking, metallurgy, glass, alkali making, rubber, medicine, pigment, organic chemical industry, etc.
Rubber
Calcium carbonate is one of the earliest and largest fillers used in the rubber industry. Calcium carbonate is filled in a large amount in rubber products, which can not only increase the volume of products, but also save expensive natural rubber or synthetic rubber, so as to reduce costs. Due to its ultra-fine and ultra-pure characteristics, nano-scale ultra-fine calcium carbonate has effectively controlled the crystal shape and particle size in the production process, and has carried out surface modification, so it has a three-dimensional structure in rubber and good dispersion. It can improve the reinforcing effect of the material.
Papermaking
Calcium carbonate is mainly used as a paper filler in papermaking. Adding a large amount of calcium carbonate to paper can ensure a certain strength and whiteness of paper and reduce costs at the same time. The extensive use of calcium carbonate in the paper industry is based on the fact that the international paper industry has shifted from an acidic papermaking process to an alkaline or neutral papermaking process, so that a large amount of cheap calcium carbonate can be used to replace the previous talc and china clay.
Calcium carbonate as a paper filler has the following advantages: ① high whiteness; ② bulkiness; ③ durability; ④ air permeability; ⑤ can be used as a supplement for titanium dioxide; ; ⑨ low absorption of ultraviolet light; ⑩ can control flammability.
Ink Paint
Stearic acid modified calcium carbonate is used in the ink industry. The prepared ink has good viscosity, good printing performance, and high stability. The fine particles are easily compatible with other raw materials, so the printed product is smooth. , Complete dots, strong hiding power, high gloss. As a filler, heavy calcium can improve the gloss and brightness of the ink.
Calcium carbonate can be used as a white pigment in paint, which acts as a skeleton, and calcium carbonate can be used as an extender pigment in the paint industry. Because the color of calcium carbonate is white, compared with latex in paint, the price of solvent is cheaper, and the particles are fine, which can be evenly dispersed in paint, so it is a large amount of extender pigment. Due to the improvement of environmental protection awareness, a large number of water-based coatings have been used in architectural coatings. Since calcium carbonate is white, hydrophilic, and cheap, it has a wide application prospect.
Plastic
Calcium carbonate is widely used in filling polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), acrylonitrile butadiene-styrene copolymer (ABS) and other resins. Adding calcium carbonate has a certain effect on improving some properties of plastic products to expand their application range. In plastic processing, they can reduce resin shrinkage, improve rheological state, control viscosity, and can also improve the dimensional stability of plastic products, improve plastic Improve the hardness and rigidity of the product, improve the processing performance of plastics, improve the heat resistance of plastic products, improve the astigmatism of plastics, and reduce the cost of plastic products.
Cosmetic
Adding nano-scale calcium carbonate in cosmetics can make the product delicate and smooth, and improve the performance and product grade of the product. It is used as an additive to make makeup setting powder, which can eliminate the brightness of the foundation powder, protect the adhesion of the skin, and has moderate oil absorption and anti-perspiration effects. It can also be used for smooth powder, which does not irritate the skin, has uniform color and certain covering power. At present, the development trend of cosmetics at home and abroad is curative effect, functionality and naturalness. Nano-scale calcium carbonate has reached food and pharmaceutical grade standards. It meets the special requirements of cosmetics and is expected to be fully applied in more and more high-end cosmetics.
Food
As a food additive, calcium carbonate should be added in a small amount, usually no more than 2%, to ensure the calcium intake necessary for the human body. In some foods (such as chewing gum, chocolate), calcium carbonate is used as a strengthening agent, which not only reduces the cost, but also acts as a matrix material.
Building Decoration
Calcium carbonate plays an important role in concrete in the construction industry, not only to reduce production costs, but also to increase the toughness and strength of the product.
Calcium carbonate is mainly used in the production process of fireproof ceiling, which can improve the whiteness, brightness and fireproof performance of the product.
Pure and impurity-free calcium carbonate is used in the floor tile industry to increase the whiteness and tensile strength of the product, improve the toughness of the product, and reduce production costs at the same time.
Breathable Membrane
Calcium carbonate material can be added to the breathable membrane as a breathable material. It is one of the important components in the production and processing of the breathable membrane material. The breathable membrane is also called “waterproof and breathable microporous membrane”. The carrier is formed by adding a certain proportion of calcium carbonate and stretched, so that the breathable membrane has unique, high-density distribution, and countless interconnected micropores with a special structure.
In the field of non-metallic minerals such as calcium carbonate, ALPA will provide you with more options, including ball milling and classification technology, steam milling technology, jet milling technology and other different methods for non-metallic ore treatment, which can achieve multi- A variety of non-metallic ores of different materials are processed. And the surface modification technology can be used to achieve the highest coverage effect with the least amount of modifiers. In the field of high-end calcium carbonate applications, ALPA occupies 70% of the market.
Large-scale and low-cost production can be realized by adopting the ball mill classification process. Taking calcium carbonate as an example, the annual output of D97:μm products in a single production line can reach 100,000 tons, and the energy consumption per ton of products is 150 kwh. The surface modification technology meets the application of minerals in the rubber and plastic industry, such as three-roll continuous modification process and eddy current mill continuous modification process. The continuous modification process of pin-disc mill, the intermittent modification process of high agitator, etc., can adopt different modification processes and modifiers according to different materials, and achieve the highest coating rate with the least amount of modifiers. The amount of modifier added is about 0.8~1.2%, and the coating rate can reach about 98%.