Production technology of high-purity, ultrafine and high-whiteness natural barium sulfate

Abstract

The invention discloses a production technology of high-purity, ultrafine and high-whiteness natural barium sulfate. The production technology comprises a crushing procedure, an acid leaching procedure, a water washing procedure, an evaporation and concentration procedure and a membrane treatment procedure. Raw ores of barite are subjected to washed, rough milling, pulp blending and secondary finemilling, so that the granularity D90 of the ores is less than 1000 meshes or lower; then two-stage acid leaching and dust removal are carried out; then four-stage water washing is carried; after deepfine milling, drying and dust removal are carried out, high-purity and ultrafine natural barium sulfate with the purity of 94 to 98 percent, the whiteness of 94 to 98 percent and the granularity D90of 3000 to 10000 meshes or products of other grades can be obtained. The technology disclosed by the invention has extremely strong adaptability; the technology is simple to operate and low in production cost; the yield of the barium sulfate in the raw ores reaches 98 percent or more.

Description

Technical field

[0001] The invention relates to a process for producing natural barium sulfate with high purity, ultrafine and high whiteness. Background technique

[0002] Natural barium sulfate, barite, is a non-metallic mineral product. Pure barite is white (it is often yellow, red or gray-brown due to the influence of impurities and mixed substances) and has glass luster. Barite is a sulfate mineral. Composition is BaSO 4 . The barite crystal grains are characterized by crystalline body crystal type, and orthorhombic crystal structure. Specific gravity is 4.5, Mohs hardness is 3-3.5, melting point is 1480℃. It is an important chemical raw material, which is widely used in the production of barium salt industrial products, petroleum, natural gas mining, medical treatment, pigments, fillers, and mineralizers in the cement industry. Currently, there are two types of barium sulfate production methods. One is obtained by washing, removing impurities, grading, and crushing ba...

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