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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 a scarce strategic resource, which is mainly manifested in low reserves and high demand. Beryllium ore leachate excess impurities will Beryllium recycling trouble, fluorine is harmful impurities in beryllium leaching solution, the fluorine content will directly affect beryllium leaching solution beryllium recovery. The beryllium concentrate leaching solution with BeO concentration of 16.86 g · L -1 was used to recover the beryllium concentrate, and the NH 3 · H 2 O was used to replace beryllium in Na OH precipitation leaching solution to make F- and NH 3 · H 2 O in leachate NH_4F. The effect of ammonia on the precipitation of beryllium, the dissolution of beryllium hydroxide by sodium hydroxide dosage and the amount of water on the hydrolysis of beryllium hydroxide were analyzed. The results showed that the optimal conditions for the beryllium recovery from the leachate were as follows: the precipitate pH was 8.5, the amount of sodium hydroxide in the filter cake was 13 times the mass of beryllium oxide when the alkali was dissolved, and the tap water was 5 times of the volume of the filtrate when hydrolyzed. The total recovery rate of beryllium reached 92.82%. At the same time, the concentration of F in the precipitate is reduced, which overcomes the unfavorable influence of F on the Be recovery in beryllium concentrate leachate.