四川平武某结合钨精矿的焙烧浸出  

Roasting and Leaching of a Combined Tungsten Concentrate from Pingwu of Sichuan Province

作　　者：王振[1,2] 徐龙华[1] 代波 刘磊[1] 冯小伟[1] 胡垚[1] 

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点试验室,四川绵阳621010 [2]四南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010

出　　处：《稀有金属》2016年第9期940-944,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51504199);西南科技大学实验技术项目(14syjs-55)资助

摘　　要：对四川平武某难处理结合钨精矿进行了成分及物相分析,发现其中所含主要矿物为白钨矿(26.47%)、黑钨矿(14.82%)、电气石(47.65%)、石英(11.06%),通过化学分析得出该试样中WO_3含量为32.66%。放大300倍的光学显微照片清晰显示大部分黑钨矿在白钨矿中以细粒嵌布形式产出,因此通过常规选矿方法难以将该结合钨精矿分离以分别获得合格的黑、白钨精矿。在物相分析的基础上,考虑通过湿法浸出的方法充分回收其中的钨元素。通过矿样筛分试验及碳酸钠焙烧浸出条件试验确定了磨矿细度为-74μm占75.68%,碳酸钠用量0.25g·g^(-1)矿样,焙烧时间3h,焙烧温度800℃;浸出时间t^2=30min的纯碱浸出流程,获得钨浸出率97.61%的结果。通过研究纯钨酸钠溶液中CaO的添加量与CaWO_4生成量的关系并结合条件试验结果讨论了浸出过程的返沉现象,试验结果表明高温焙烧导致石灰的生成,会造成浸出液中的WO_4^(2-)发生返沉,导致浸出率的下降,所以焙烧时加入过量的碳酸钠是必要的。The component and phase analysis was conducted for a combined tungsten concentrate from Sichuan Province. The results showed that the primary minerals in this combined tungsten concentrate were scheelite （26.47%）, wolframite （ 14.82% ）, tourmaline （47.65 % ） , quartz （11.06% ） and the wolframite finely disseminated in scheelite so it could not be coped with by conventional beneficiation methods to get qualified tungsten concentrate. The hydrometallurgical leaching method was thus taken into account. Then the soda leaching process parameters of -74 p,m of 75.68% , sodium carbonate dosage of 0.25 g·g^-1 , samples-calcination time of 3 h, calcination temperature of 800 ℃, extraction time of 30 min were determined and the resulting tungsten leaching recovery of 97.61% was obtained. The results showed that CaO formed by the decomposition of calcium carbonate at high temperature, caused the reprecipitation of WO4^2- , so an excess amount of sodium carbonate in roasting process was necessary.

关 键 词：结合钨精矿 碳酸钠焙烧 浸出 返沉 

分 类 号：TD913[矿业工程—选矿]