A pretreatment method for a beryllium sulfate fluoride solution and preparation of beryllium oxide

By pretreating the fluorinated beryllium sulfate solution, including adjusting the pH value, adding reducing agents and defluorinating agents, and combining cryolite defluorination and goethite methods, the problem of high-fluoride beryllium ore processing was solved, and the preparation and recovery rate of high-purity beryllium oxide were improved.

CN117865193BActive Publication Date: 2026-06-23HUNAN NONFERROUS METALS HLDG GROUP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN NONFERROUS METALS HLDG GROUP
Filing Date
2024-01-08
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies are difficult to effectively process beryllium ore with high fluorine content, which makes it difficult to separate beryllium from aluminum. Fluorine-beryllium complexation reduces the beryllium precipitation recovery rate. In addition, existing methods have problems such as high cost, harm to human health, and large equipment investment.

Method used

A pretreatment method for a fluorinated beryllium sulfate solution is adopted, which includes adjusting the pH value, adding a reducing agent and a defluorinating agent, filtering, oxidizing to remove iron and degreasing with activated carbon, and treating with cryolite for defluorination and goethite to form cryolite slag and goethite slag, thereby reducing the fluorine and iron content in the solution.

Benefits of technology

The preparation of high-purity beryllium oxide has been achieved, the beryllium recovery rate has been improved, the production cost has been reduced, the equipment investment has been reduced, and the process is simple and easy to industrialize.

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Abstract

The application belongs to the technical field of metallurgy and relates to a pretreatment method of a beryllium sulfate solution containing fluorine, which comprises the following steps: S1, defluorination: adjusting the pH of the beryllium sulfate solution containing fluorine to 0.5-1.5 by using sodium alkali, heating to 85-95 DEG C and reacting for 90-150 min, adding a reducing agent and a defluorination agent, and filtering to obtain defluorination liquid and cryolite slag; S2, iron removal by oxidation: slowly adding an oxidizing agent to the defluorination liquid, heating to 88-95 DEG C and reacting for 16-24 h, and filtering to obtain iron removal by oxidation liquid and goethite slag; and S3, oil removal by activated carbon: adding activated carbon to the iron removal by oxidation liquid, removing oil at 45-50 DEG C for 35-45 min, and filtering to obtain a pretreatment liquid of the beryllium sulfate solution. The application applies the cryolite defluorination method and the goethite method to the pretreatment of the beryllium sulfate solution, and compared with the conventional sulfuric acid method, the amount of aluminum removal slag and iron removal slag is greatly reduced, and the requirement that high-purity beryllium oxide can be obtained without purification of beryllium oxide is realized.
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