Method for preparing ultrafine high-whiteness active barite powder

Abstract

The invention relates to the field of mineral materials, in particular to a method for preparing ultrafine high-whiteness active barite powder. The method comprises the following steps of: (1) preparing pulp from 325-mesh barite powder, and performing wet ultrafine grinding until the particle size is less than 10mu m; (2) filtering the barite pulp subjected to wet ultrafine grinding, and drying; (3) adding mixed acid into the dried ultrafine barite powder, and performing oxidation leaching reaction with stirring, wherein the mixed acid is a mixed solution of sulfuric acid, hydrofluoric acid and oxalic acid; (4) filtering the barite powder subjected to oxidation leaching reaction by the mixed acid, and washing until the pH is 6 to 7; and (5) performing pressure filtration, and drying to obtain the ultrafine high-whiteness active barite powder. The preparation method is simple and controllable and easy to popularize, equipment can be localized completely, over 99 percent of prepared barite product has the particle size of -10mu m, and the whiteness is over 90 percent.

Description

technical field [0001] The invention relates to the field of mineral materials, in particular to a method for preparing ultrafine high-whiteness active barite powder. Background technique [0002] Barite is an important barium-containing mineral with the characteristics of high density, stable chemical and thermal properties. The current barite minerals are mainly used in petrochemical and other low value-added fields, such as barite weighting agent, barium-containing chemical products, etc., and the ultra-fine high whiteness active barite powder has good performance (particle size) Microfine, large specific surface area, high chemical activity, high whiteness), mainly used in coatings, paper, rubber, medicine and other industrial sectors; in recent years, it has also been expanded to military high-tech fields such as stealth materials and radiation protection materials. [0003] Traditional physical or physical and chemical separation methods (such as hand selection, gravi...

AI Technical Summary

Problems solved by technology

[0003] Traditional physical or physical and chemical separation methods (such as hand selection, gravity separation, magnetic separation, flotation, chemical leaching, etc.) cannot produce ultra-fine high whiteness active barite powder

At present, the widely used method of adding bleaching agent (sodium dithionite) to redox reaction to prepare high-whiteness barite under acidic conditions also has the problems of high cost, complicated process, unstable technical indicators, and difficult control of operating conditions.