硫酸亚铁铵氧化还原滴定法测定钼精矿中钼

Determination of molybdenum in molybdenum concentrate by redox titration with ammonium ferrous sulfate

本文主要研究了钼精矿中常量钼的分析方法,并应用于我公司实际生产实践,建立的方法适合公司目前生产现状。此方法主要的内容是:钼精矿先用硝酸—氯酸钾饱和溶液低温加热溶解,再用硫酸、浓磷酸、高氯酸混酸高温加热消解,然后在酸性介质中,以盐酸氯丙嗪作为指示剂,抗坏血酸还原掩蔽高价铬、锰、铈等金属离子,用硫酸亚铁铵直接滴定钼(VI)。从磷酸用量、硫酸用量、抗坏血酸用量、指示剂用量以及滴定温度等方面进行了实验条件的优化,取得了理想的效果。测定钼含量范围为10%以上的钼精矿,误差均在0.4%以内。

This paper mainly studies the analysis method of constant molybdenum in molybdenum concentrate,and applies it to the actual production practice of our company.Firstly,molybdenum concentrate was dissolved by saturated solution of potassium nitrate-chlorate,then dissolved by sulfuric acid,concentrated phosphoric acid and perchloric acid mixed acid.Then,in acid medium,chlorpromazine hydrochloride was used as indicator.The experimental conditions were optimized in terms of the amount of phosphoric acid,sulfuric acid,ascorbic acid,indicator and titration temperature.The error of determination of molybdenum concentrate in the range of molybdenum content is less than 0.4%.