Superfine ground calcium carbonate powder production method

Abstract

The invention belongs to the field of nonmetallic mineral processing and specifically relates to a superfine ground calcium carbonate powder production method. The method comprises the following steps: crushing the marble raw material into coarse calcium carbonate having the diameter of less than or equal to 1cm; grinding the coarse calcium carbonate by use of a dry grinding mill to obtain a calcium carbonate powder mixture; performing grading treatment on the calcium carbonate powder mixture to obtain a first-stage powder having the granularity greater than j, a second-stage powder having the granularity within the range of j-k, and the third-stage powder having the granularity less than k, next, returning the first-stage powder to the dry grinding mill for grinding, performing wet grinding on the second-stage powder, directly feeding the third-stage powder to a product homogenization silo for homogenization or wet grinding, wherein k is smaller than j; and after the all wet-ground calcium carbonate slurry is dried and crushed, homogenizing and packaging. The superfine ground calcium carbonate powder production method is capable of effectively saving the energy under the premise of guaranteeing the product quality and the production efficiency.

Description

technical field [0001] The invention belongs to the field of non-metallic mineral processing, and in particular relates to a production method of superfine heavy calcium carbonate powder. Background technique [0002] The production methods of heavy calcium carbonate mainly include dry method and wet method. The dry method has high production efficiency, but the fineness of the product is limited by the grinding and grading technology, so it is difficult to produce ultra-fine heavy calcium products. The fineness of powder produced by wet method is low, and the powder can also be modified during grinding. Therefore, wet method is often used to produce ultra-fine heavy calcium products, but wet method involves slurry configuration, grinding, and drying. And other processes, so the production efficiency is low, and the energy consumption is also high. Patent CN101875793A proposes a production method of combining dry grinding and wet grinding to produce ultrafine modified heavy...

AI Technical Summary

Problems solved by technology

Patent CN101875793A proposes a production method of combining dry grinding and wet grinding to produce ultrafine modified heavy calcium carbonate. The coarse powder of dry grinding is directly made into slurry, and then wet grinding is carried out to produce ultrafine modified calcium carbonate. Powder, its product has the characteristics of high output rate, high purity, uniform particle size distribution, etc., but according to the inventor's analysis, in this method, part of the fine powder in the dry grinding coarse powder will be repeatedly ground, resulting in low overall production efficiency, The energy consumption is high, and the fine powder in the slurry is easy to aggregate during wet grinding, which affects the grinding efficiency and product quality