重铬酸钾滴定法测定钼精矿中铁的含量

POTASSIUM DICHROMATE TITRATION METHOD FOR DETERMINING IRON CONTENT IN MOLYBDENUM CONCENTRATE

研究了钼精矿中铁含量的分析方法。试样以氯酸钾-硝酸饱和溶液分解,用盐酸溶解可溶性盐类,以水稀释至一定量体积,用氨水将铁沉淀分离,盐酸将沉淀溶解,用二氯化锡将铁还原至二价,过量的二氯化锡用二氯化汞除去,以二苯胺磺酸钠为指示剂,用重铬酸钾标准溶液滴定,由消耗标准溶液的量计算铁的含量,回收率在99.80%~100.20%之间。该方法简便快速,具有很好的精密度和准确度,已应用到实际生产中,结果满意。

The analysis method of iron content in molybdenum concentrate is studied.The sample is decomposed into a saturated solution of potassium chlorate nitric acid,soluble salts are dissolved in hydrochloric acid,diluted to a certain volume with water,and the iron precipitate is separated with ammonia water.The precipitate is dissolved in hydrochloric acid,and the iron is reduced to divalent with tin dichloride.Excess tin dichloride is removed with mercury dichloride.Sodium diphenylamine sulfonate is used as an indicator,and potassium dichromate standard solution is titrated.The iron content is calculated based on the amount of standard solution consumed,and the recovery rate is between 99.80%and 100.20%.This method is simple and fast,with good precision and accuracy,and has been applied in practical production with satisfactory results.