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Introduction

Calcium carbonate is an inorganic compound, the main component of limestone and calcite. It is divided into two categories: heavy calcium carbonate and precipitated calcium carbonate. Due to the differences of the particle size, crystal form, and the nature of interface between heavy calcium carbonate and precipitated calcium carbonate, their features are vastly different.

And benefit from its properties, calcium carbonate are widely used in many industries, such as it can be used in paper making, plastric production, medicines, chmical industries, nano calcium industry and coating industry, etc.

Processing technology

Dry production technology of heavy calcium carbonate

Firstly, limestones from the quarry are selected by hands, clearing the gangue. Next, limestones are fed to crushers and be crushed to small particles. Then calcium carbonate grinding mill is used to produce fine limestone powder. Finally qulified products are separated from the mill and are collected by the collecter installed at the end of the production line.

The main production technologies of light calcium carbonate at home

Carbonation method

Calcining the raw materials such as limestone to generate lime (ingredient for calcium oxide); then adding water to digest lime to generate lime milk (ingredient for calcium hydroxide) and then passing into the carbon dioxide carbide lime milk for calcium carbonate precipitation; lastly, the calcium carbonate precipitation by dehydration, drying and crushing system to get light calcium carbonate.

Causticizing alka line

In the process of producing caustic soda (NaOH), can be a by-product of light calcium carbonate. Adding lime hydrate in soda ash aqueous calcium carbonate can generate precipitation, and get the caustic soda solution at the same time, lastly the precipitation of calcium carbonate by dehydration, drying and crushing system to get light calcium carbonate.

Soda ash (Na2CO3) calcium chloride method

In the soda ash adding calcium chloride aqueous solution, the calcium carbonate can generate precipitation.

Method of Solvay

In the process of producing soda ash, by-product light calcium carbonate can be obtained. Saturated salt water with carbon dioxide for carbonation after inhaling ammonia, and then get the heavy alkali (sodium bicarbonate) precipitation and ammonium chloride solution. Light calcium carbonate production technology is mainly divided into the following steps: 1.the limestone calcinations 2.quick lime digestion 3.lime water carbonated 4.sedimentation and filtration 5.drying and crushing.

Equipment needed

MTW Series Trapezium Mill

The mills is integrant machines in the processing of calcium carbonate and their properties directly deside the production costs. Well, one good mill usually has advantages as follows: stable performance, convenient operation, low energy consumption, adjustable and controllable final size, widely used grinding materials , equipped with special dust collector. And dust emission concentration is lower than the national environmental regulations completely.

Take SBM MTW series grinding mill for example. Because of its vertical structure, it covers a little area, in this way, it help investors save lots of fundation and workshop costs. Also, its compact structure, perfect transmisson device and excellent sealing system can ensure its reliable performance and long service-life.

Besides the MTW series grinding mill, SBM also has one high performance mill, the MTM series trapezied mill. It is the upgraded mill of Raymond mill. This mill has similar working principle &outside surface with Raymond mill, but it has many more advantages, such as, the MTM has higer grinding efficiency, higher capacity and fewer noises. So it is much more cost-efficiency and much more environment friendly.

MTM Series Medium Speed Trapezium Mill

Application field

1Rubber:

For tires, hose, belt and oil seal, auto parts and other rubber products

2Papermaking

For cigarette paper, recording paper, book page printing paper, high brightness coated paper, sanitary napkins, diapers and so on

3Ink

For offset printing inks, gravure inks

4Coating

For water-based paint and oil paint

5Plastics

Suitable for engineering plastics modification, PP, PE, PA, PC and so on

6The sealant material

Suitable for silicone, poly flow, polyurethane, epoxy structural adhesive seal

7Other areas

Nano-calcium carbonate in the feed industry as a calcium supplement, increasing dietary calcium; use in cosmetics, you can replace titanium dioxide

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