High-purity activated heavy calcium carbonate

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...

AI Technical Summary

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