Method for rapidly determining total iron in sulfur acid residue

Abstract

The invention provides a method for rapidly determining total iron in sulfur acid residue, which is as follows: reagent is used for analyzing in public and in a blank way volume difference of potassium dichromate standard titrimetric solution which is consumed by front and back titration, wherein the volume difference is blank valve (V0=V1-V2); milliliter quantity obtained by V1-V0 is used for calculating mass friction of total iron in sulfur acid residue test sample. The method overcomes shortcomings that the existing analytic method has poor accuracy, and a method of recycling and resolving sulfur acid residue test sample by alkali fusion or acid soluble is fussy, and has high energy consumption and the like. The method determining total iron in sulfur acid residue has the advantages of economy, environmental protection, simplicity, rapidness and accuracy.

Description

technical field [0001] The invention relates to a method for rapidly determining total iron in sulfuric acid slag. Background technique [0002] Sulfuric acid slag is a solid waste discharged during the production of sulfuric acid using pyrite or sulfur-containing tailings as raw materials. The comprehensive utilization of it can not only eliminate the harm to the environment, but also be reused as a resource. Millions of tons of sulfuric acid slag are discharged every year in our country. At present, some countries have fully utilized it, and our country's utilization is only about 50%. The iron content in sulfuric acid slag is generally 30% to 50%, and it also contains a certain amount of copper, lead, zinc, silver, gold and other rare and precious metals and radioactive elements. It is a valuable raw material. After magnetic separation and gravity separation, the sulfuric acid slag with an iron content of 50% to 65% can be used as an iron-making raw material, and an iron...

AI Technical Summary

Problems solved by technology

These two methods all have high energy consumption (11~14kW·h) and long detection time (3~4h). If they are directly dissolved in acid, many sulfuric acid slag samples will not be completely decomposed, which will affect the accuracy and accuracy of the analysis results. Therefore, it is a requirement for development to study an economical, simple, fast and accurate detection method for the determination of iron content in sulfuric acid slag, which is of great significance to the comprehensive utilization of sulfuric acid slag.

[0004] Che Diqiang from the Product Quality Supervision and Inspection Institute of Deyang City, Sichuan Province used hydrochloric acid to dissolve samples, and potassium dichromate redox titration of ferrous ions determined the content of total iron in sulfuric acid slag; Tao Ying, Department of Chemical Engineering, Kaifeng University, used redox titration, Complexometric titration and spectrophotometry were used to analyze and determine the total iron content in pyrite slag, and the advantages and disadvantages of the three analysis methods were compared, but the decomposition of the sample was not involved at all, only the decomposition of the sample after decomposition The test solution was compared with different assay methods

As mentioned above, in many sulfuric acid slag samples submitted for inspection, if they are directly acid-dissolved, the decomposition of the sample will not be complete, resulting in low analysis results, which will affect the accuracy of the analysis.

The method of recovering and decomposing sulfuric acid slag samples from alkali fusion or acid soluble residues is cumbersome and consumes a lot of energy, which is not the development requirement of today's analysis and detection technology

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