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Ground calcium carbonate manufacturing processPosted: 2020-04-03

  • Ground calcium carbonate, referred to as heavy calcium carbonate, is a white powder processed from high-quality calcite as a raw material. Its main component is CaCO3, which is insoluble in water and ethanol. There are two types of ground calcium carbonate manufacturing process. 
    ground calcium carbonate


    Production process of ground calcium carbonate


    1. Dry production process

    First, manually select calcite, limestone, chalk, shells, etc. from the quarry to remove the gangue; then use a crusher to coarsely crush the limestone, and then use a Raymond mill (pendulum) to grind to obtain fine limestone powder. Finally, the classifier is used to classify the milling powder, and the powder that meets the particle size requirements is packaged into the warehouse as a product, otherwise it is returned to the milling machine and ground again.
    Raymond mill for ground calcium carbonate powder making
    Raymond Mill

    2. Wet production process

    Firstly, the dry fine powder is made into a suspension and pulverized in a mill. After dehydration and drying, ultra-fine ground calcium carbonate is prepared.


    The role and use of heavy calcium carbonate


    At present, with the improvement of the technology of making powder by the mill. Calcium carbonate has been widely used in papermaking, plastics, plastic films, chemical fiber, rubber, adhesives, sealants, daily chemicals, cosmetics, building materials, coatings, paints, inks, putty, sealing wax, putty, felt packaging, medicine, food (Such as chewing gum, chocolate), feed, its role is to increase product volume, reduce costs, improve processing properties (such as adjusting viscosity, rheological properties, vulcanization properties), improve dimensional stability, reinforce or semi-reinforcing, improve Printing performance, improve physical properties (such as heat resistance, matting, abrasion resistance, flame resistance, whiteness, gloss), etc.

    Ground calcium carbonate is widely used in resins such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and acrylonitrile-styrene copolymer (ABS). The addition of calcium carbonate has a certain effect on improving and improving certain properties of plastic products to expand its application range. In plastic processing, they can reduce the shrinkage of resin, improve rheology, and control viscosity. It can also play the following roles:

    1. Improve the dimensional stability of plastic products

    The addition of calcium carbonate plays a skeleton role in plastic products, and has a great effect on the stability of plastic products.

    2. Improve the hardness and rigidity of plastic products

    In plastics, especially soft polyvinyl chloride, the hardness gradually increases with the addition of calcium carbonate, and the elongation decreases with increasing hardness. Calcium carbonate with fine particles and large oil absorption value has a large growth rate of hardness. On the contrary, calcium carbonate with a small particle coarse oil absorption value has a small increase in the hardness of the plastic. Among soft polyvinyl chlorides, the hardness growth rate of ground calcium carbonate is the smallest, and precipitated calcium carbonate (light) is the second.

    3. As a pulp material, make full use of the characteristics of high whiteness, good hydrophilicity and high impact strength of ground calcium.
     

    What is the difference between ground calcium carbonate and precipitated calcium carbonate


    1. Different acquisition methods

    Precipitated calcium carbonate is a calcium carbonate product obtained by chemical methods, and ground calcium carbonate is a calcium carbonate product obtained by physical methods.

    2. Different raw material content

    Ground calcium carbonate generally uses high-purity limestone, and precipitated calcium carbonate can choose low-purity limestone.

    3. Different raw material properties

    Precipitated calcium carbonate usually has higher whiteness, the national standard for whiteness is above 90, and the sedimentation volume is higher, generally above 2.5. The density of ground calcium carbonate is heavier than that of precipitated calcium carbonate. Generally, the whiteness is low, the sedimentation volume is low, and the particle size is difficult to be finer.
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