Preparation method of platy strontium carbonate particles

Abstract

The invention provides a preparation method of platy strontium carbonate particles. The steps include using reduced coal dust to roast reduced celestite ore at high temperature and prepare chamotte containing strontium sulfide; leaching the chamotte by hydrothermal to obtain strontium sulfide solution and simultaneously removing calcium, barium and other foreign ions from the strontium-containing solution; then carrying out oxidation treatment on the strontium-containing solution under the action of a catalyst and recovering sulphur side product and obtaining clean strontium solution; and finally preparing the strontium carbonate product with special platy structure by strictly controlling the carbonizing treatment condition of the strontium solution. The platy strontium carbonate product has uniform particles, high purity, and excellent flow property, dispersion property and fusion property with other materials. The preparation method avoids generating sulfureted hydrogen gas in carbonization process, thoroughly gets rid of sulfureted hydrogen pollution in the production process and can simultaneously separate solid sulphur to be beneficial to the strict control over the index of total sulphur in the product.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method for preparing flaky strontium carbonate particles, in particular to a method for preparing flaky industrial strontium carbonate or high-purity strontium carbonate by using carbon reduction method with low- and medium-grade celestite ore as raw material particle method. technical background [0002] Strontium carbonate chemical formula SrCO3, molecular weight 147.63. White powder, insoluble in water, slightly soluble in water containing carbon dioxide and ammonium salt solution. Heating to 900°C decomposes into strontium oxide and carbon dioxide, dissolves in dilute hydrochloric acid and dilute nitric acid and releases carbon dioxide. The melting point is 1497°C. Used as electronic component material, spectroscopic reagent, pyrotechnic material, rainbow glass and other strontium salt preparation. The purity, crystal form and surface properties of str...

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Problems solved by technology

This method mainly has the following problems: firstly, the environmental pollution is serious, the treatment of sulfur-containing wastewater, waste gas and waste residue is difficult, the working environment is extremely harsh, and there is also the risk of hydrogen sulfide leakage; secondly, the sulfur content in the product is too high High, difficult to improve the product grade, unable to meet the needs of domestic and foreign customers for special morphology and higher quality strontium carbonate

But if adopt above-mentioned general roasting reduction, leaching, yellow water decalcification barium is refined, then carbon dioxide carbonization method is produced, and strontium carbonate content is about 97% in the strontium carbonate product that obtains, but total sulfur content is difficult to control especially, very difficult It is difficult to stably produce high-quality strontium carbonate products with a strontium carbonate content greater than 98%, lower total sulfur content, excellent physical properties and dispersion properties that meet the large demand of the international market

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