Method for pre-treating high-impurity copper anode slime rich in noble metals

Abstract

The invention belongs to the field of hydrometallurgy of non-ferrous metals, and particularly relates to a method for pre-treating high-impurity copper anode slime rich in noble metals. The method comprises the following special steps: adding sulfuric acid in the dried copper anode slime to mix size, placing in a microwave reactor, carrying out the microwave acid leaching for 5-30 min, performing the solid-liquid separation to obtain microwave acid leaching slag and a microwave acid leaching solution, adding dilute sulphuric acid in the microwave acid leaching slag to mix size, placing the microwave acid leaching sizing agent in a high-pressure reaction kettle under the pressure of 0.8-1.2 MPa after oxygen introducing, carrying out pressure acid leaching for 4-6 h to obtain pressure acid leaching slag and a pressure acid leaching solution, recovering gold and silver from the pressure acid leaching slag, and recovering nickel from the pressure acid leaching solution. The method adopting the technical scheme improves the recovery rate of copper, selenium, tellurium and nickel in the impurity copper anode slime, shortens the processing time of the copper anode slime, increases the processing capacity of the copper anode slime, enables the trend of the noble metals to be reasonable and concentrated, and is favorable for comprehensive recovery.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and in particular relates to a method for pretreating and enriching precious metals with high-impurity copper anode slime. Background technique [0002] During the electrolytic refining process of crude copper, the copper on the anode and the base metal with a negative potential dissolve into the solution under the action of direct current, while the electropositive metals, such as gold, silver and platinum group metals, do not electrochemically dissolve on the anode. However, it falls into the bottom of the tank in a very finely dispersed state to form copper anode slime. Copper anode slime contains a large amount of precious metals, platinum group metals and rare elements, and is an important raw material for extracting rare and precious metals. In order to effectively extract rare and precious metals from copper anode slime and facilitate the recovery of other valuable elem...

AI Technical Summary

Problems solved by technology

The traditional pretreatment process of high-impurity copper anode slime has disadvantages such as poor raw material adaptability, metal dispersion, and low production efficiency.

The dispersion of valuable metals in the pretreatment process will increase the difficulty of metal recovery and increase the production cost, which is not conducive to the smooth progress of the subsequent precious metal extraction process, directly affecting the precious metal extraction efficiency and product quality

Microwave leaching has the characteristics of fast reaction speed and high leaching rate, but the leaching rate of oxides is low, which makes the separation of noble and base metals in copper anode slime incomplete; while pressure leaching is very beneficial to the leaching of oxides, and the leaching rate of oxides is relatively low. High, but the leaching effect on scattered metals such as selenium and tellurium is not obvious

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