Continuous determination method for contents of sulfuric acid, copper and nickel in copper electrolyte

Abstract

The invention discloses a continuous determination method for the contents of sulfuric acid, copper and nickel in a copper electrolyte. The method comprises the following steps: adding neutral ultrapure water into a same copper electrolyte, and with a pH meter used for indication of terminal points, determining sulfuric acid by using an acid-base titration method; adding ammonia water into the sample where determination of sulfuric acid is finished so as to adjust a pH value to 3.0 to 4.0, adding ammonium bifluoride, potassium iodide and a starch indicator and determining copper in the copper electrolyte by using sodium hyposulfite titration; and adding a tartaric acid solution into the sample where determination of copper is finished, adjusting a pH value to 8.0 to 9.0 by using ammonia water, adding a sodium hyposulfite solution and a murexide indicator and carrying out titration with an EDTA standard solution so as to determine the content of nickel in the electrolyte. The continuous determination method provided by the invention has the advantages of simple operation, short determination time, accurate results, low cost, etc. The continuous determination method is applicable to rapid continuous determination of the contents of sulfuric acid, copper and nickel in copper electrolytes from copper smelting plants and provides instant rapid analysis for quality control of the copper electrolytes.

Description

technical field [0001] The invention is designed in the technical field of chemical detection, and specifically relates to a method for continuously measuring the contents of sulfuric acid, copper and nickel in a copper electrolyte. Background technique [0002] Metal copper is a widely used non-ferrous metal material. From copper ore mining to smelting refined copper and high-purity copper that can be used in electrical appliances, light industry and other industries, copper electrolysis is an indispensable process. process. During the electrolytic refining process of copper, the concentrations of sulfuric acid, copper and nickel in the copper electrolyte are changing as the electrolysis progresses. If the content of sulfuric acid, copper, and nickel in the copper electrolyte exceeds the allowable range of the electrolyte, it will have a huge impact on copper electrolytic refining. The quality of copper products has a significant impact. [0003] The determination of sul...

AI Technical Summary

Problems solved by technology

Flame atomic absorption spectrometry can quickly determine nickel, but this method also has shortcomings: the concentration of salt and sulfuric acid in the copper electrolyte is high, and the corrosion-prone equipment will cause too much loss to the instrument; at the same time, when the nickel content is too high, due to the dilution factor A large error in the analysis results

Diacetyl oxime precipitation and separation of nickel-EDTA titration method has a long analysis cycle, and it takes more than 6 hours to analyze a sample, which is time-consuming and labor cost is too high

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