Process for producing high-purity electronic grade strontium carbonate

Abstract

The invention provides a method for preparing high-purity electronic grade strontium carbonate. The method comprises the following steps: dissolving strontium chloride into deionized water; adding mixture of strontium hydroxide accounting for 3 to 5 percent of the strontium chloride by weight and microbial flocculating agent MBFA9 into the deionized water; filtering the solution and removing impurities of the solution to be prepared into a strontium chloride with water for standby; slowly flowing a sodium hydroxide solution into the strontium chloride solution to react; pumping obtained strontium hydroxide solution into a carbonization reactor, and introducing pure carbon dioxide into the reactor to be carbonized to obtain strontium carbonate pulp; and drying and crushing the strontium carbonate pulp to obtain strontium carbonate powder. Compared with the prior process for producing the strontium carbonate, the method not only saves investment of high-temperature calcination equipment in production, but also greatly reduces energy consumption and pollution to environment, simplifies and optimizes production process, shortens reaction time, and ensures that the prepared strontium carbonate powder has the advantages of good dispersivity, high purity and the like.

Description

technical field [0001] The invention relates to a production method of strontium carbonate, in particular to a preparation method of high-purity electronic grade strontium carbonate. Background technique [0002] Electronic grade strontium carbonate is widely used in the production of various electronic components, and is an important raw material for the electronics industry. Such as PTC thermistors, ring varistors, MLCC multilayer ceramic capacitors, etc.; it can also be used in color TV glass bulbs, magnetic material iron In the production of strontium acid. [0003] The traditional production process of strontium carbonate is as follows: pulverize lapis lazuli and carry out metathesis reaction with ammonium carbonate to obtain crude strontium carbonate, crude strontium carbonate and ammonium salt for transformation reaction, filter and remove slag, add ammonium carbonate for precipitation reaction, after filtration , the filter cake is dried and pulverized to obtain str...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problems existing in the production of strontium carbonate in the prior art, such as complex process, high requirements on the performance of reaction equipment, high energy consumption, long time and high cost of the reaction process.

[0005] The invention also solves the technical problems of low product purity, large particles and uneven particle size distribution in the production of strontium carbonate in the prior art.

Images