Process for preparing ultrafine calcium carbonate in wet-method grinding way

Abstract

The invention provides a process for preparing ultrafine calcium carbonate in a wet-method grinding way, which relates to the technical field of fine chemical industry. The process comprises the following steps: (1) transporting calcite to a jaw crusher by virtue of a transporting machine, roughly crushing the calcite, enabling the crushed calcite to enter a raymond mill to be finely crushed, filtering the finely crushed calcite, removing iron by virtue of an iron removal device, and obtaining dry powder; (2) adding water, diethylene glycol and front-stage dispersant, controlling the rotationspeed at 100 to 300 r / min, mixing for 10 to 20 min, adding the dry powder, increasing the rotation speed to 1000 to 1200 r / min, mixing for 20 to 40 min, transferring the mixed slurry into a grinding machine, wherein a ball-material ratio is 3:1, a grinding medium is grinding zirconium balls, after beginning the grinding, supplementing the front end dispersant one time every 30 minutes, grinding for 2 hours, then adding a rear dispersant and a PH adjusting agent, wherein the addition amount of the rear-stage dispersant is 0.4 to 0.5 percent of the weight of the calcite, and continuously grinding for 100 to 120 min; and (3) discharging, washing, drying, thus obtaining a finished product. By adopting the process, the agglomeration phenomenon in the production process of the ultrafine calciumcarbonate can be effectively solved, and the production scale can be increased.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a process for preparing ultrafine calcium carbonate by wet grinding. Background technique [0002] Ultrafine calcium carbonate refers to calcium carbonate with primary particle size between 0.02-0.1μm. It is a kind of nanometer material. It has special quantum size effect, small size effect and surface effect, making it different from conventional powder Compared with the material, it shows obvious advantages in terms of reinforcement, transparency, dispersion, thixotropy and leveling, and its toughening and reinforcing effect has greatly improved and improved the product performance and quality of related industries. At present, The production of ultra-fine calcium carbonate in the industry is mostly divided into dry method and wet method. Among them, the dry method technology is more mature, and the processing device system composed of general grinding and grading equipm...

AI Technical Summary

Problems solved by technology

[0002] Ultrafine calcium carbonate refers to calcium carbonate with primary particle size between 0.02-0.1μm. It is a kind of nanometer material. It has special quantum size effect, small size effect and surface effect, making it different from conventional powder Compared with the material, it shows obvious advantages in terms of reinforcement, transparency, dispersion, thixotropy and leveling, and its toughening and reinforcing effect has greatly improved and improved the product performance and quality of related industries. At present, The production of ultra-fine calcium carbonate in the industry is mostly divided into dry method and wet method. Among them, the dry method technology is more mature, and the processing device system composed of general grinding and grading equipment can obtain products of various particle sizes, but the dust pollution is relatively large. With the increase of specific surface area requirements, the production cost is unbearable. Compared with the traditional dry method, the wet method has the advantages of finer calcium carbonate fineness, larger specific surface area, higher chemical stability and less pollution. Series advantages

However, there is agglomeration phenomenon in the production process, and the scale of wet production has been limited

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