Method of crude gold purification

Abstract

A method for purifying crude gold belongs to the technical field of gold purification. It includes casting raw material crude gold containing 85-99.5% gold into gold anode plate, using pure gold or titanium plate as cathode, using biscuit ceramic crucible as diaphragm for cathode, and using dilute hydrochloric acid as electrolyte for electrolysis to convert gold into gold Solution, control the gold content of the solution or control the oxidation-reduction potential, and use a reducing agent to reduce the gold solution to 1# gold powder. Compared with electrolytic purification, the grade range of crude gold is relaxed, and the adaptability to raw materials is greatly enhanced; the process backlog is greatly reduced. Compared with pulverization and purification, the process is reduced, and the original coarse gold pulverization and chemical dissolution are combined into one step of electrochemical dissolution; the equipment is localized, which greatly saves investment; the production cost is greatly lower than that of pulverization and purification.

Description

(1) Technical field [0001] The invention relates to a method for purifying crude gold whose grade is less than 99.5%, and belongs to the technical field of gold purification. (2) Background technology [0002] At present, electrolytic purification is generally used in China, and the crude gold is cast into an anode plate, and the gold is dissolved on the anode by the action of an electric current, and the gold is selectively precipitated on the cathode to achieve the purpose of purification. Domestic manufacturers include Chengdu Great Wall Refinery, Inner Mongolia Qiankun Refinery, Shenyang Smelter Comprehensive Recovery Workshop, etc. This method is quite mature at home and abroad, but the method has the following disadvantages: First, the grade of electrolytic gold must reach the national 1# gold, and the grade of anode gold generally reaches more than 99.5%, that is to say, this method is suitable for processing grades of 99.5% For the above crude gold, the crude gold w...

AI Technical Summary

Problems solved by technology

This method is quite mature at home and abroad, but the method has the following disadvantages: First, the grade of electrolytic gold must reach the national 1# gold, and the grade of anode gold generally reaches more than 99.5%, that is to say, this method is suitable for processing grades of 99.5% For the above crude gold, the crude gold with a grade of less than 99.5% must be pretreated to reach 99.5% before electrolysis; the second is that there is a large backlog of gold in the process of this method

This method can process crude gold of various grades, but because the domestic pulverization equipment cannot meet the required fineness, the equipment can only be imported, and the equipment import needs about 3 million yuan, which is a large investment; in addition, the production and operation costs are relatively high. high