Ferric iron titration test paper in nickel electrolysis system solution

Abstract

The invention discloses a piece of ferric iron titration test paper in a nickel electrolysis system solution. The ferric iron titration test paper comprises a test strip and a standard color card. Inaddition, the preparation method of the test strip includes: immersing medium-speed filter paper in a potassium thiocyanate standard reagent solution with the mass percentage of 20% to 25% for 10 to 15min until the complete immersion, carrying out drying naturally, carrying out cutting to obtain a test strip, and then carrying out plastic sealing bookbinding. The method for preparing a standard color card includes: analyzing total iron concentrations in different concentrations of iron-containing solutions by testing, fully oxidizing the iron-containing solutions, carrying out titration by using a potassium thiocyanate standard reagent solution with the mass percentage of 20% to 25% after oxidation to determine the colors in the different concentrations of iron-containing solutions, and then carrying our color arrangement on the card. Therefore, the concentration contents of ferric ions in different nickel electrolysis system solutions can be determined rapidly; the detection and analysis efficiency is improved; the determined f concentration content difference is only within the 0.1g / L; and the iron supplementation can be adjusted timely in the production process.

Description

technical field [0001] The invention belongs to the technical field of ferric ion titration, and in particular relates to a titration test paper for ferric iron in a nickel electrolytic system solution. Background technique [0002] Nickel sulfide soluble anode nickel electrolytic purification production process is sulfuric acid, hydrochloric acid mixed acid system, the system contains a variety of metal ions; in addition, because the arsenic in the purchased raw materials enters and gradually increases, the high arsenic anode plate is dissolved in the nickel electrolysis process , the arsenic impurity enters the anolyte, and after the application of the nickel electrolytic purification and removal of arsenic process, it is determined that the iron content has the greatest impact on the removal of arsenic. At present, there is no clear and fast quantitative judgment method for the analysis of different concentrations of ferric ions in China, only by chemical analysis. It is ...

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Problems solved by technology

[0002] Nickel sulfide soluble anode nickel electrolytic purification production process is sulfuric acid, hydrochloric acid mixed acid system, the system contains a variety of metal ions; in addition, because the arsenic in the purchased raw materials enters and gradually increases, the high arsenic anode plate is dissolved in the nickel electrolysis process , the arsenic impurity enters the anolyte, and after the application of the nickel electrolytic purification and removal of arsenic process, it is determined that the iron content has the greatest impact on the removal of arsenic. At present, there is no clear and fast quantitative judgment method for the analysis of different concentrations of ferric ions in China, only by chemical analysis. It is impossible to quantitatively determine the concentration of ferric ions by testing the total iron in the system, which is of little significance for production guidance. Therefore, the concentration of ferric ions cannot be effectively controlled during the production process. The arsenic content of products produced by nickel electrolysis continues to exceed the standard, which affects the quality of electrolytic nickel

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