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用碘量法测定含钨矿石中的锡时,钨有不同程度的干扰,因为在还原时钨将被还原成低价而出现钨蓝,直接影响滴定终点的辨别。为了解决这个问题,经试验找到了一个简易可行的方法,即以锌粉-氢氧化钠熔融矿样,用盐酸溶液浸取,高锰酸钾氧化析出钨酸沉淀,过滤分离后用碘量法测滤液中锡。分析步骤称取0.2000克矿样于已加有2克锌粉的高铝坩埚中,搅均后加入1克氢氧化钠、补加1克锌粉并在其上覆盖1.5克氯化钠,置于700—750℃高
Iodometric determination of tin in tungsten ore, tungsten have different levels of interference, because the reduction of tungsten will be reduced to low prices and the emergence of tungsten blue, a direct impact on the titration end point of identification. In order to solve this problem, the experiment found a simple and feasible method, that is, zinc powder - sodium hydroxide melting mineral sample, leaching with hydrochloric acid solution, potassium permanganate oxidation precipitation of tungstic acid, filtered and separated by iodometry Test filtrate tin. Analysis step Weigh 0.2000 grams of ore samples have been added 2 grams of zinc powder in the high-alumina crucible, stir after adding 1 gram of sodium hydroxide, add 1 gram of zinc powder and 1.5 grams of sodium chloride on it, At 700-750 ℃ high