Production method of high-purity barium sulfate

Abstract

The invention discloses a production method of high-purity barium sulfate. According to the production method, barium sulfate with any content is used as a raw material and impurity ions in the bariumsulfate are removed through a chlorinating agent and a vulcanizing agent; the mol ratio of metal impurity ions M1 in filtrate, namely, a barium sulfate solution, to chlorine ions F in chloride is that the ratio of M1 to F is equal to 1 to (1 to 3); the content of the barium sulfate is improved; and after detection, the content of a product produced by the invention reaches 99 percent or above andthe utilization requirements of the raw materials of a lithium-ion battery are met.

Description

technical field [0001] The invention relates to a method for purifying sulfate and its products, in particular to a method for producing high-purity barium sulfate. Background technique [0002] Barium sulfate is an important chemical product, which can be widely used in industrial and agricultural production. It is an important trace element fertilizer in agriculture and a catalyst for plants to synthesize chlorophyll. Spraying barium sulfate can make a variety of hydroeconomic crops grow well, increase production, and can also be used as a feed additive. In industry, high-purity barium sulfate is mainly used in the preparation of barium-based positive electrode materials for lithium-ion secondary batteries, but lithium-ion barium-based positive electrode materials have relatively strict standards for K, Na, Ca, Mg, Fe, F and heavy metals. Requirements, but allow the presence of Li, Co, Ni plasma. Therefore, it is difficult to use common barium sulfate products as barium-...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to use ordinary barium sulfate products as barium-based positive electrode materials for lithium-ion secondary batteries, and it needs to be purified.

[0003] Generally, the existing method for purifying barium sulfate has complex production process, high production cost, and insufficient industrial feasibility, such as Chinese Patent No. 921126735 "Preparing High-purity Barium Sulfate Solution with High Yield", which is based on Low-grade barium carbonate containing potassium is used as a raw material, and the leaching process is completed in two stages in two leaching devices separated from each other, and potassium is removed, and then barium sulfate is prepared. The production cost is high, the process steps are complicated, and the barium sulfate produced is difficult Achieve the use of barium source in lithium-ion battery cathode materials