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 cer-tain volume with water,and the iron precipitate is separated with ammonia water.The precipitate is dissolved in hydro-chloric acid,and the iron is reduced to divalent with tin dichloride.Excess tin dichloride is removed with mercury di-chloride.Sodium diphenylamine sulfonate is used as an indicator,and potassium dichromate standard solution is titra-ted.The iron content is calculated based on the amount of standard solution consumed,and the recovery rate is be-tween 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.
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