High-purity activated heavy calcium carbonate

A heavy calcium carbonate and calcium carbonate technology, applied in the treatment of dyeing high molecular organic compounds, dyeing physical treatment, dyeing low molecular organic compounds and other directions, can solve the problems of low purity, high oil absorption value and high water absorption, and achieve The effect of small particle size distribution, high dispersion and good performance

Inactive Publication Date: 2015-10-28
CHIZHOU DAHENG BIOCHEM
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Problems solved by technology

However, heavy calcium carbonate has a large particle size distribution range, high water absorption, high oil absorption value, non-white chroma, and low purity, which is not conducive to improving the tensile, compressive, and wear-resistant properties of products, so it is necessary to improve traditional calcium carbonate products. performance, which can effectively improve its application performance in industrial fields such as plastics, rubber, coatings and papermaking

Method used

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Embodiment Construction

[0015] A kind of preparation method of high-purity active ground calcium carbonate, first send calcite in grinder after mechanical pulverization and grind, obtain calcium carbonate coarse powder; Add 25kg water to the 50kg coarse powder after grinding and send into grinder In the process, a wet grinding process is used to grind to obtain a calcium carbonate semi-finished product; 0.5 kg of a mixture of stearic acid and calcium stearate is added to the calcium carbonate semi-finished product as a modifier and modified, and then dried; Finally, the modified calcium carbonate is sent to a strong magnetic strip powder sieving box for screening, and the finished high-purity active ground calcium carbonate can be obtained, and the finished product is high in purity and white in color.

[0016] In order to achieve a better grinding effect, a two-stage wet grinding process is used in the grinding process. The first-stage grinding is to control the flow rate of the slurry at 5t / h first,...

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Abstract

The present invention discloses a high-purity activated heavy calcium carbonate. The preparation steps comprise: carrying out mechanical crushing on calcite, and conveying into a grinder to grind to obtain calcium carbonate coarse powder; adding water to the grinded coarse powder, conveying into the grinder, and grinding by using a wet grinding process to obtain a calcium carbonate semi-finished product, wherein a mass ratio of the grinded coarse powder to the water is 2:1-1.5; adding a stearic acid and calcium stearate mixture as a modifying agent to the calcium carbonate semi-finished product, carrying out a modifying treatment, and carrying out a drying treatment; and finally conveying the modified calcium carbonate into a strong magnetic stripe powder screening box to screen to obtain the finished product high-purity activated heavy calcium carbonate. According to the present invention, the physical grinding is used to obtain the heavy calcium carbonate, the heavy calcium carbonate prepared by using the wet grinding has characteristics of high dispersity and small particle size distribution, the performance is excellent especially after the second wet grinding, and the calcium carbonate powder screened through the strong magnetic stripe powder screening box has characteristics of high purity and white chrominance.

Description

technical field [0001] The invention relates to a heavy calcium carbonate, in particular to a high-purity active heavy calcium carbonate. Background technique [0002] Ground calcium carbonate is a very important functional inorganic filler, which is widely used in industrial fields such as plastics, rubber, coatings and papermaking. However, heavy calcium carbonate has a large particle size distribution range, high water absorption, high oil absorption value, non-white chroma, and low purity, which is not conducive to improving the tensile, compressive, and wear-resistant properties of products, so it is necessary to improve traditional calcium carbonate products. It can effectively improve its application performance in industrial fields such as plastics, rubber, coatings and papermaking. For this reason, a high-purity active ground calcium carbonate has been developed to meet the needs of new materials and new technologies. Contents of the invention [0003] The techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/10
Inventor 潘俊杰
Owner CHIZHOU DAHENG BIOCHEM
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