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| Recovery of Beryllium and Production of Magnesium Fluoride from Beryllium-containing Smelting Slag |
| Received:April 26, 2022 Revised:May 07, 2022 |
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| DOI：doi：10.3969/j.issn.1007-7545.2022.07.023 |
| KeyWord:smelting slag; beryllium; hydrofluoric acid; gravity separation; graphite; magnesium fluoride |
| Author | Institution |
| ZENG Zhi-yan |
五矿铍业股份有限公司 |
| WANG Lei |
钢铁研究总院先进钢铁流程及材料国家重点实验室;钢研晟华科技股份有限公司;钢研晟华科技股份有限公司 |
| KONG Ling-bin |
钢铁研究总院先进钢铁流程及材料国家重点实验室;钢研晟华科技股份有限公司;钢研晟华科技股份有限公司 |
| CHENG Quan-hui |
五矿铍业股份有限公司 |
| GUO Pei-min |
钢铁研究总院先进钢铁流程及材料国家重点实验室;钢研晟华科技股份有限公司;钢研晟华科技股份有限公司 |
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| Abstract: |
| In order to solve the accumulation of beryllium-containing smelting slag and recover beryllium and magnesium resources, the beryllium-containing slag was treated by acid leaching, gravity separation, and calcination. The key parameters of acid leaching process were studied in detail. The results show that leaching rate of beryllium from beryllium containing smelting waste residue by hydrofluoric acid is 89% and beryllium content in residue is 0.05% under the optimum leaching conditions including L/S of 2.5 mL/g, acid concentration of 18%, leaching temperature of 85℃, and leaching time of 6 h. In order to improve leaching rate of beryllium in slag, secondary countercurrent hydrofluoric acid leaching was used. The results show that the comprehensive recovery of beryllium is 97% above and beryllium content in residue can be reduced to 0.012%. After gravity separation and calcination, high quality products with MgF2 content of 98% above and beryllium content of 0.01% below can be obtained. It is feasible to adopt the combined method of smelting, separation and calcination, which can not only recover the residual beryllium in slag, but also produce qualified MgF2 products. |
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