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白钨(即钨酸钙矿CaWO_4)精矿中的黑钨[即钨锰铁矿(Fe,Mn)WO_4],在湿法冶金工艺中,影响钨的回收率;在火法冶金工艺中,黑钨中的锰是有害杂质.因此要求选矿工艺提供白钨精矿时,控制其中黑钨的含量。为满足选、冶工艺的需要,需制定一个测定白钨精矿中黑钨的方法. 但目前高品位钨的物相分析,方法较少,而且不适于高白钨中低黑钨的测定。在低品位钨物相分析中,我们曾确定了良好的选择性溶剂——2.5%盐酸一1.5%(二水合)草酸及其浸取矿样的温度、时间和磨矿粒度等条件。本工作在此基础上,进一步作了补充实验,使方法适于白钨精矿中黑钨的测定.
Wollastonite [ie, wolframite (Fe, Mn) WO_4] in scheelite (ie, calcium tungstate CaWO_4) concentrate affects the recovery of tungsten in the hydrometallurgical process. In the pyrometallurgical process, Black tungsten in the manganese is harmful impurities.Therefore, mineral processing technology is required to provide scheelite, which control the content of black tungsten. In order to meet the needs of the election and metallurgical processes, a method for the determination of black tungsten in scheelite concentrates needs to be developed, but there are few methods for the phase analysis of high-grade tungsten at present, and it is not suitable for the determination of low-black tungsten in high-scheelite. In the low-grade tungsten phase analysis, we determined the conditions of temperature, time and grinding particle size of 1.5% HCl (1.5% hydrochloric acid) and its leaching ore sample, a good selective solvent. On this basis, this work further complements the experiment, making the method suitable for the determination of black tungsten in scheelite concentrate.