Method for producing less-barium fine strontium salts from celestite

Abstract

The invention mainly aims to provide a method for producing less-barium fine strontium salts from celestite, and the method is low in cost, which comprises the steps: refining: crushing or grinding the celestite to particles of less than 200 mesh; acid washing: reacting diluted hydrochloric acid with the levigated celestite, and removing a carbonate component in the celestite to obtain high-purity refined celestite; and double decomposition: adding the refined celestite to an ammonium carbonate aqueous solution, uniformly stirring, then reacting in an airtight condition at a reaction pressure of 0.2-0.3MPa and a reaction material temperature of 100-115 DEG C, stopping heating after the reaction is finished, filtering and washing obtained solid to obtain a strontium carbonate crude product, and further refining the strontium carbonate crude product to obtain a product. The method has the advantages that during the double decomposition reaction, when reacting with the celestite, ammonium carbonate only reacts with strontium sulfate in the celestite without reacting with barium sulfate, so that the barium content of the obtained strontium carbonate crude product is very low and lower than 0.05%; and the method is low in production cost and has wide market prospect.

Description

technical field [0001] The invention relates to inorganic chemical industry, in particular to a production process of strontium salt. Background technique [0002] Minerals containing strontium mainly include: lapis lazuli: the main components are: strontium sulfate 50-80%, barium sulfate 1-4%, strontium carbonate 5-15%, calcium carbonate 8-15%, calcium sulfate 3-8%, other 5% or so. Strontium: The main component is strontium carbonate with a content of 40-70%. Mixed ore: The main components are strontium sulfate and strontium carbonate, the content of strontium sulfate is 30-45%, and the content of strontium carbonate is 30-40%. [0003] Among them, strontium ore is a secondary ore with few reserves; lapis lazuli is a primary ore with abundant reserves, lower price and wide application. There are also more reserves of mixed ore, but because the composition is more complex than the first two, it is difficult to produce high-purity refined products. Therefore, the producti...

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Problems solved by technology

The purity of strontium carbonate produced by this method is acceptable, but the cost of raw materials is relatively high, and ammonium nitrate is a dangerous product and the main component of civil explosives, and the control is relatively strict. There is a large safety risk as a raw material for production, and the approval, transportation, and storage of procurement It is also relatively troublesome; so at present, there are only experimental reports in China and cannot be put into industrial production

[0006] The production of fine strontium salt products such as strontium nitrate and strontium chloride and high-purity strontium carbonate all adopts strontium carbonate and strontium hydroxide produced by the first method as raw materials for production, and the main impurity removal process is barium removal, so In the process of using sulfuric acid precipitation to remove barium, a large amount of strontium must be precipitated, so this alone will cause the consumption of strontium carbonate to increase by 15-20%, so the production cost is still high

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