The method of determining the total amount of iron in iron ore and using manual visual titration is used. That is, the sample is decomposed into a solution with hydrochloric acid or various types of alkali, and the total amount of iron is determined by manual titration using a burette. In the titration, the color change of the indicator should be judged by the naked eye to determine the end point. The titration process has three endpoints, including the simultaneous use of the potassium dichromate solution for the oxidant and the titrant, and the error is introduced multiple times, which affects the accuracy of the determination. degree. In addition, some of the samples after treatment have a turbid color, and it is difficult to observe the discoloration of the indicator, and the endpoint is difficult to judge. In this paper, the microwave digestion method is used to treat the sample, which eliminates the complicated residue recovery process. The titration process uses the automatic potentiometric titration method to save time. Compared with the classical manual visual titration method, the automation degree is high, the processing batch is large, accurate, simple, etc. To meet the laboratory's task of testing large quantities of iron ore.
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