Method for preparing flaky ground calcium carbonate powder

Abstract

The invention relates to a method for preparing flaky ground calcium carbonate powder by dry process, which takes pegmatite calcite as raw material and comprises the following steps: (1) the raw material is crushed to be 5-10mm; (2) dry process grinding: the crushed raw material is ground by a horizontal ball mill, the grinding medium is a zirconium oxide rod which has the diameter of 30-50mm and the length of 60-100mm, and the grinding time is 40-60min; finally, the flaky ground calcium carbonate powder is obtained. The flaky ground calcium carbonate powder prepared by the invention has 92-96% of content with the grain diameter being smaller than 8mum, and the radius-thickness ratio of the flaky ground calcium carbonate powder is more than 4:1. The flaky ground calcium carbonate powder prepared by dry process can be obtained without drying, and the production cost is lower.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate powder, in particular to a preparation method of flaky calcium carbonate powder. Background technique [0002] Calcium carbonate powder is one of the widely used inorganic salt functional fillers, mainly used in plastics, rubber, coatings, sealants, adhesives, papermaking, printing inks, daily necessities, food, health products, pharmaceuticals, etc. Modifiers, brighteners, etc. Flake calcium carbonate powder can improve the surface gloss and flatness of the product, and the enhancement effect is better. Calcium carbonate powder is divided into heavy calcium carbonate and light calcium carbonate according to different processing techniques. Heavy calcium carbonate is processed by physical crushing of high-quality natural calcium carbonate, and light calcium carbonate is precipitated calcium carbonate obtained from limestone through calcination→digestion→carbonization. There are two t...

AI Technical Summary

Problems solved by technology

The easiest way to prepare flaky light calcium carbonate is a one-step process, such as Japanese Patent 2-184519 and Chinese Patent CN1080909A, but they all use toxic crystal form control agents; Chinese Patent CN1157444C has announced a kind of flaky heavy calcium carbonate The preparation method, its technological process is: 1. raw material dry method, 2. slurry mixing, 3. wet method ultrafine grinding, 4. ultrafine grinding post-treatment (press filter into cake, dry), this is a kind of wet method preparation The method of flaky heavy calcium carbonate has the advantage that the powder particle size is fine (less than 2 microns, the content of particles is greater than 90%), and the disadvantage is that the dry powder of flaky heavy calcium carbonate can be obtained after drying