Cathode gold electrolytic refining process

Abstract

The invention provides a cathode gold electrolytic refining process. According to the invention, an electrolyte formula is changed, and electrolytic refining is carried out in a hydrochloric acid system with low gold ion solubility (Au<3+> 80-120g/L) and low acid (60-90g/L) with a titanium motherboard used for replacing a traditional gold starting sheet as a cathode. During the electrolysis process, with a quantitative dosing device, an inhibiting agent is automatically added online according to the variation of the components of the electrolyte, such that interferences of impurities such as lead and silver upon electric gold quality and an anode passivation problem are solved. Also, an automatic thermal insulation measure is provided for the electrolyte, such that a phenomenon of easy stratification and concentration polarization is eliminated. Higher than 99.995% electric gold products with qualified physical specifications and chemical qualities can be produced through one-step direct electrolysis. Aiming at a workplace environment ventilation problem, inner-ring and outer-ring skilful isolation is adopted, such that process exhaust problems of product pollution, environment pollution and equipment corrosion are solved. With the process provided by the invention, purposes of high efficiency, environment protection, and energy saving are realized. The process has a high popularization value in the field of precious metal refining.

Description

technical field [0001] The invention relates to a cathode gold electrolytic refining process. Background technique [0002] Traditional gold electrolytic refining uses crude gold as the anode and pure gold as the cathode. In high gold ion solubility (Au 3+ 160~320g / L) and high-acid (150~200g / L) hydrochloric acid system to produce 99.99% electrolytic gold by electrolytic refining. The whole process includes three steps: liquid making, starter sheet manufacturing, and electrolysis. The traditional gold electrolytic refining process is complicated, and there are the following main problems: 1. Since the gold precursor is used as the cathode, an independent gold precursor production system needs to be established, and the gold electrolysis can only be carried out after the precursor is made. Therefore, the production cycle is long, the utilization rate of equipment is low, the backlog of gold in the whole process is large, and the turnover of working capital is slow. 2. The ve...

AI Technical Summary

Problems solved by technology

During the electrolysis process, the quantitative addition device is used to automatically add inhibitors online according to the changes in the composition of the electrolyte to solve the interference of impurities such as lead and silver on the quality of the electro-gold and the problem of anode passivation; a