Process for preparing high purity strontium carbonate

Abstract

Disclosed is a process for preparing high purity strontium carbonate, which comprises mixing celestite, anthracite coal, calcium chloride as catalyst, high-temperature roasting for deacidizing strontium sulfide, filtering strontium monosulfide through heat leaching, charging sodium-hydroxide and strontium monosulfide to result in alkali analysis reaction, producing strontium hydroxide crystalline body, the purifying strontium hydroxide through recrystallization process, finally reacting pure strontium hydroxide solution with let-in carbon dioxide at the presence of ultrasonic wave action, thus producing high purity strontium carbonate powder, and reacting lime cream with strontium monosulfide to obtain sodium-hydroxide and strontium monosulfide precipitate, wherein sodium-hydroxide can be circulated in the alkali analysis reaction.

Description

technical field [0001] The invention relates to a method for preparing high-purity strontium carbonate, in particular to the preparation of strontium carbonate for electronic ceramics. Background technique [0002] High-purity strontium carbonate is an important inorganic fine chemical product and an essential raw material for the electronics industry. It not only requires high chemical purity, but also requires small particle size, narrow particle size distribution range and approximately round particle shape. . At present, only a few countries in the world, such as Japan and the United States, can produce such high-purity strontium carbonate. Most of its manufacturing methods use industrial-grade strontium carbonate as raw material, and the preparation processes mainly include thermal decomposition and chemical double decomposition. The thermal decomposition method (US3743691, JP59-83934, CN87101234A, CN87104559A, CN1031983A) is to decompose industrial strontium carbonat...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: a large amount of harmful gas hydrogen sulfide is produced in the reaction process, which is very easy to cause environmental pollution, so how to control the pollution of hydrogen sulfide gas is the key to the development of this technology; loss of waste

However, the production cost of directly preparing high-purity strontium carbonate by using celestite reduction metathesis method is low, but so far in my country, the research and production of high-purity strontium carbonate directly prepared by this process are still blank

The patent "production process of strontium carbonate" (CN1042886A) first reacts with hydrochloric acid and strontium sulfide leaching solution, and then reacts with ammonium bicarbonate to prepare strontium carbonate, and the waste gas strontium sulfide uses CaCN 2 Absorption; this method also eliminates the hazards of hydrogen sulfide gas from the source, but consumes a large amount of chemical raw materials such as hydrochloric acid and ammonium bicarbonate

And the patent "A Harmless Production Process for Producing Strontium Carbonate from Carbon Reduction Lapis Lazuli" (CN1562759A) uses milk of lime and strontium sulfide leaching solution to directly react to form strontium hydroxide and calcium sulfide precipitation, thereby eliminating S 2- harm; there is a defect in this method—the dissolved strontium hydroxide and calcium sulfide generated are small or even insoluble, and a large amount of strontium hydroxide octahydrate crystals will be mixed with calcium sulfide after the reaction, which cannot be separated

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