Process for producing barium sulfate byproduct in process of removing barium from yellow water

Abstract

The invention relates to a process for producing a barium sulfate byproduct in the process of removing barium from yellow water. The process comprises the following steps of: (1) obtaining the yellow water, namely calcining celestite and reducing coal to obtain black ash, and leaching the black ash by using water to obtain an aqueous solution of strontium sulfide, namely the yellow water; and performing natural sedimentation on the yellow water at the temperature of between 80 and 85 DEG C to remove impurities, namely acid-insoluble substances and calcium ions so as to obtain clear yellow water; (2) performing barium removal reaction, namely adding industrial dilute sulfuric acid into the clear yellow water, and performing barium removal reaction; and continuously stirring for 2 to 5 hours to convert barium ions into barium sulfate; (3) adding a flocculating agent, namely a polyacrylamide solution into the yellow water subjected to barium removal reaction, stirring, and filtering to obtain a filter cake and filtrate yellow water; and (4) carbonizing the filtrate yellow water by the conventional process to produce strontium carbonate; and washing the filter cake for one to two times, drying, and grinding to obtain the barium sulfate byproduct. The process is simple and low in cost, the clarity of the yellow water can be effectively improved, the content of the barium ions in the yellow water is reduced, and the environment-friendly barium sulfate byproduct is obtained.

Description

technical field [0001] The invention relates to the technical field of strontium carbonate production, in particular to a production process of by-product barium sulfate in the process of removing barium from yellow water. Background technique [0002] Celestite is the main mineral resource for the production of strontium carbonate. After calcining celestite and coal powder in a rotary kiln to obtain black ash, the solution of strontium sulfide obtained by leaching black ash with water is called yellow water. Yellow water contains a large amount of strontium ions and a small amount of Barium ions, barium ions affect the quality of strontium carbonate. Due to the large-scale mining of celestite ore in recent years, the rich ore has been decreasing year by year. The lean ore high barium ore is used in the process of producing strontium carbonate by the black ash method. Sometimes the content of barium ions reaches 10g / l. In order to obtain more than 97% strontium carbonate Pr...

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Problems solved by technology

Due to the large-scale mining of celestite ore in recent years, the rich ore has been decreasing year by year. The lean ore high barium ore is used in the process of producing strontium carbonate by the black ash method. Sometimes the content of barium ions reaches 10g / l. In order to obtain more than 97% strontium carbonate Products, adding the corresponding barium removal process, usually using 20-40% sodium sulfate solution or industrial dilute sulfuric acid to generate barium sulfate precipitation to remove barium, the generated barium sulfate contains sulfur and polysulfides, strontium sulfate and acid insolubles, etc. Impurities, and the generated barium sulfate particles are very small, the natural sedimentation speed is slow, and the content of the generated barium sulfate is below 70%, all of which are eliminated in the form of waste residue, which not only pollutes the environment, but also causes a waste of resources

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