重量法测定高锡钨精矿中的钨

Determination of Tungsten in Tungsten Concentrate with High Stannum by Gravimetric Method

为消除重量法测定钨精矿中钨时锡的干扰,在溶解过程中用氢溴酸反复冒烟进行消除,利用ICP–OES 法测定残渣和滤液中剩余钨量,再与传统重量法相结合进行钨的定量测定.结果表明,该方法的检出限为0.01 μg/mL,测定结果的相对标准偏差为3.53%～5.26%（n=5）,加标回收率为98.78%～100.93%.该分析方法不仅能够消除锡的干扰,而且可以相对快速得到稳定可靠的结果.

For the tungsten concentrate with high stannum, a combinational method to determine tungsten was proposed with traditional gravimetric method and ICP-OES, the interference of stannum in the dissolution process was eliminated by hydrobromic. The results showed that the detection limit of the method was 0.01μg/mL, the relative standard deviation was 3.53%-5.26%(n=5), and the recovery was 98.78%-100.93%. The method can not only eliminate the interference of stannum, but also get reliable results relatively quickly.