A New Method for Determination of Total Iron in Iron Ore by Potassium Dichromate Volumetric Method

Abstract

The invention discloses a novel method for determination of total iron of iron ore by a potassium dichromate volumetric method. The novel method comprises the following steps of crushing an iron ore sample to obtain powder having particle size less than 0.088mm, weighing 0.1000g of the crushed iron ore sample, putting the crushed iron ore sample into 250mL of a conical flask, adding 6mL of concentrated hydrochloric acid into the conical flask, carrying out heating dissolution, dropwisely adding a tin dichloride solution into the conical flask until the color is white, carrying out cooling, fast adding 100mL of tap water into the conical flask, adding 5ml of a sulfur-phosphor acid mixture standard solution into the conical flask, dropwisely adding 4 drops of a sodium diphenylaminesulfonate indicator into the conical flask, and carrying out titration by a potassium dichromate standard solution until the color is purple. The novel method reduces a reagent use amount by 1 / 2, is free of titanium trichloride and sodium tungstate and utilizes tap water to replace distilled water or deionized water. The novel method furthest reduces reagent and energy consumption and a lab test cost, reduces environmental pollution, reduces labor intensity of lab test workers, improves a lab test speed and reduces iron ore sample lab test time to about 3min from about 10min.

Description

technical field [0001] The invention belongs to the technical field of mineral chemical composition analysis, and in particular relates to a method for determining the content of total iron in iron ore, and is particularly suitable for measuring the grade of total iron by using potassium dichromate redox in the laboratory analysis of iron ore production. Background technique [0002] Potassium dichromate volumetric method is a rapid analysis method commonly used in the determination of total iron in iron ore in recent years. This method uses potassium dichromate redox to determine the total iron grade in iron ore, which is easy to understand from the principle of the method, but in daily actual production and testing, if the national standard method is used, not only hydrochloric acid, sulfuric acid, phosphoric acid, tin dichloride, Various chemical reagents such as titanium chloride, sodium tungstate, and potassium dichromate and a large amount of distilled water are used, ...

AI Technical Summary

Problems solved by technology

However, the reagents used in this method include sulfuric acid mixed acid (sulfuric acid + phosphoric acid), hydrochloric acid, nitric acid, tin dichloride solution, titanium trichloride hydrochloric acid solution, sodium tungstate, sodium diphenylamine sulfonate, potassium dichromate standard solution, Various reagents such as ammonium ferrous sulfate solution, there are many types of reagents, and the test operating conditions are not easy to control

Moreover, the determination range of this method is only applicable to materials with a TFe content of more than 30%, especially when the vanadium content is greater than 0.5%, and the copper content is greater than 0.5%, this method is not suitable

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