Method for preparing high-purity strontium dihydroxide by utilizing strontium slag

A technology of strontium hydroxide and sodium hydroxide, applied in calcium/strontium/barium oxide/hydroxide, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve environmental problems such as pollution, waste of resources, etc. To achieve the effect of short process flow, reduce pollution and improve utilization rate
CN105293554AActive Publication Date: 2016-02-03QINGHAI UNIV FOR NATITIES
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
QINGHAI UNIV FOR NATITIES
Publication Date
2016-02-03

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Abstract

The invention discloses a method for preparing high-purity strontium dihydroxide by utilizing strontium slag. The method comprises the steps: (1) grinding the strontium slag; (2) dissolving the ground strontium slag and adding mixed solution of sulfuric acid and hydrochloric acid, and performing filtration to obtain liquid first solution; (3) adding sodium hydroxide solution into the first solution, performing filtering separation of sediment after the heating, and obtaining liquid second solution; (4) adding solid strontium dihydroxide into the second solution, performing heating to 40-70 DEG C and then maintaining constant temperature for 0.5-2 h, performing filtering separation of sediment, and obtaining strontium chloride solution; (5) using deionized water to dilute the strontium chloride solution and then adding sodium hydroxide solution to perform alkali decomposition, and filtering the precipitated crystal to obtain coarse strontium hydroxide crystal; (6) recrystalizing the coarse strontium hydroxide crystal, and obtaining high-purity strontium dihydroxide crystal. According to the method, tailing resources are utilized, the strontium ore utilization rate is improved, and the environmental pollution caused by tailings is reduced.
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