中文摘要：

我国钨冶炼技术世界领先，但由于Na＋和Cl-无法闭路循环，沿袭百年的碱（酸）浸出-净化-铵盐转型湿法工艺难以达到废水零排放要求.“钨精矿火法直接制取碳化钨”和“熔盐电解直接制取碳化钨或金属钨”工艺，在金属提纯和分离杂质方面存在难以克服的缺陷，同时存在酸洗废液排放的问题.铵盐不变体系白钨闭路冶炼工艺研究结果表明，与现行白钨碱法-离子交换工艺相比，全流程金属回收率提高2.6%，达到98.1%，APT产品加工成本下降30%，可实现白钨无酸碱闭路冶炼和杂质元素的绿色分离，过程无废水排放.

英文摘要：

Although a world leader in tungsten metallurgy,the acid and alkali leaching- chemical purification-ammonium salt transformation wet processing technology applied in China tungsten industry for hundreds of years failed to achieve zero waste water discharge due to the Na＋and Cl-problems. The pyrogenic method for making tungsten carbide directly from tungsten concentrates and the process for making tungsten carbide or metallic tungsten directly by fused salt electrolysis have some insurmountable faults in metal purification and the separation of impurities. One of the bottle-neck problems is the waste acid and alkali water discharge. The results shows that, comparing with traditional technological process, the total yield of WO 3 is 98.1%, up 2.6 %. The cost has been reduced by 30 % in this process. The technology has realized green scheelite smelting with acid and alkali-free with no waste water discharge.