Process for preparing flaky heavy calcium carbonate

Abstract

A process for preparing flaky heavy calcium carbonate includes choosing altered calcite or coarse-grain marble, pulverizing, preparing slurry, superfine ball grinding with zirconium (or aluminium) oxide balls with diameter of 0.5-1.2 mm and 1.5-2 mm in a ratio of (1-2):(1-3) for 30-60 min, pressing filtering and drying. Its advantages are low cost, no toxicity and no environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate powder, in particular to a preparation method of flaky ground calcium carbonate. Background technique [0002] Calcium carbonate powder can be used as a filler in papermaking, plastics, rubber, coatings, and adhesives to enhance mechanical and physical properties. The flaky calcium carbonate powder can improve the surface gloss and flatness of the product, especially in the paper industry, it can replace the flaky washed kaolin and be used as a top coating for copper plates and white papers. Calcium carbonate powder can be divided into two categories according to different preparation methods, one is prepared by chemical methods, called light calcium carbonate; the other is prepared by mechanical grinding method, called heavy calcium carbonate, Such as patent CN1161996A, its technological process is: 1, dry crushing and grinding of raw materials, 2, slurry mixing and dispersion, 3, wet...

AI Technical Summary

Problems solved by technology

The flaky calcium carbonate powder produced at present is flaky light calcium carbonate, and the easiest method is one-step method such as Japanese patent flat 2-184519 and Chinese patent CN1080909A, but the former uses a toxic crystal form control agent organic phosphine , the latter uses a low-toxic boride as a crystal form control agent, which is easy to pollute the environment

There is no report on the preparation of flaky heavy calcium carbonate by mechanical method