摘要
铍是一种稀缺的战略资源,其主要表现在储量少,需求量大。铍矿石浸出液中过多的杂质会给铍的回收带来麻烦,氟是铍浸出液中的有害杂质,氟含量的多少会直接影响铍浸出液中铍的回收率。针对Be O浓度为16.86 g·L^(-1)的铍精矿浸出液进行了回收工艺试验,用NH_3·H_2O代替Na OH沉淀浸出液中的铍,使得浸出液中的F-能与NH_3·H_2O生成NH_4F。重点分析了氨水对铍的沉淀效率、氢氧化钠用量对氢氧化铍的溶解以及水用量对氢氧化铍水解的影响。结果表明,浸出液中铍回收的最佳工艺条件为:沉淀p H为8.5,碱溶时滤饼中氢氧化钠用量为氧化铍质量的13倍,水解时自来水用量为滤液体积的5倍。铍的总回收率达到了92.82%。同时,降低了沉淀中F的浓度,克服了F对铍精矿浸出液中Be回收的不利影响。
Beryllium is one kind of rare strategic resource. The geological reserve is very low, while the demand is vast. Excessive impurities in leachate of beryllium ore could cause some difficuhies for beryllium recovery. Fluoride, as a harmful impurity, directly in- fluences the beryllium recovery in leaching solution. Beryllium recovering experiments were performed by beryllium ore leaching solu- tion with concentration of 16.86 g L-1 BeO. The precipitation of beryllium was conducted by NH3 H2O instead of NaOH solution, which made F- in the leaching solution react with NH3 H2O to generate NH4F. The precipitation efficiency of BeO with NH3 H2O was analyzed. The effects of the dosage of NaOH and water on BeOH hydrolysis were also analyzed. The optimal parameters for recovering beryllium from leaching solution were acquired. The results showed that, the optimal pH for precipitation was 8.5, the optimal consumption of NaOH was 13 times the BeO mass, and the water consumption for hydrolysis was 5 times the amount of filter liquor. The recovery rate of beryllium achieved more than 92.82%. Meanwhile, the fluoride concentration was decreased in sediments, which overcame the adverse effects of fluoride on BeO recovery from beryllium leachate.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2016年第1期71-76,共6页
Chinese Journal of Rare Metals
基金
湖南省科技厅重点项目(2013GK2023)资助
关键词
浸出液
回收
氧化铍
优化
leachate
recovery
beryllium oxide
optimization
