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

A technology of anode slime and impurity copper, which is applied in the direction of improving process efficiency, can solve the problems of unfavorable extraction of precious metals, increased costs, and low production efficiency, and achieves the effects of simplified purification process, reduced production cost, and short processing time

Active Publication Date: 2014-01-15
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 extract

Method used

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

Examples

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Example Embodiment

[0021] Example 1

[0022] (1) Microwave acid leaching: add water to the high-impurity copper anode mud for coarse slurry adjustment, screen out the sand particles with a particle diameter greater than 5mm, drain the water, and add 500g to the drained copper anode mud / L sulfuric acid slurry to obtain copper anode mud slurry, and control the weight concentration of copper anode mud in the copper anode mud slurry at 30%;

[0023] Put the copper anode mud slurry in a microwave reactor, add oxidant H 2 O 2 , H 2 O 2 The dosage is 2.5molH 2 O 2 / L slurry, microwave frequency is 2450MHz, microwave heating power is 500w, acid leaching is carried out in a microwave reactor for 20 minutes, and then solid-liquid separation is carried out to obtain microwave acid leaching residue and microwave acid leaching liquid, which are recovered from the microwave acid leaching liquid Copper, selenium and tellurium;

[0024] (2) Pressurized acid leaching: add 300g / L dilute sulfuric acid to the microwave ...

Example Embodiment

[0027] Example 2

[0028] (1) Microwave acid leaching: add water to the high-impurity copper anode mud for coarse slurry adjustment, sieve out sand particles with a particle diameter greater than 5mm, drain the water, and add 400g to the drained copper anode mud / L sulfuric acid slurry to obtain copper anode mud slurry, and control the weight concentration of copper anode mud in the copper anode mud slurry at 20%;

[0029] Put the copper anode mud slurry in a microwave reactor, add oxidant H 2 O 2 , H 2 O 2 The dosage is 5molH 2 O 2 / L slurry, microwave frequency is 2450MHz, microwave heating power is 1000w, acid leaching is carried out in a microwave reactor for 30 minutes, and then solid-liquid separation is carried out to obtain microwave acid leaching residue and microwave acid leaching liquid, which are recovered from the microwave acid leaching liquid Copper, selenium and tellurium;

[0030] (2) Pressurized acid leaching: add 500g / L dilute sulfuric acid to the microwave acid l...

Example Embodiment

[0033] Example 3

[0034] (1) Microwave acid leaching: add water to the high-impurity copper anode mud for coarse slurry adjustment, screen out the sand particles with a particle diameter greater than 5mm, drain the water, and add 250g to the drained copper anode mud / L sulfuric acid slurry to obtain copper anode mud slurry, and control the weight concentration of copper anode mud in the copper anode mud slurry to 10%;

[0035] Put the copper anode mud slurry in a microwave reactor, add oxidant H 2 O 2 , H 2 O 2 The dosage is 3molH 2 O 2 / L slurry, microwave frequency of 2450MHz, microwave heating power of 300w, acid leaching in a microwave reactor for 30 minutes, and then solid-liquid separation to obtain microwave acid leaching residue and microwave acid leaching solution, which are recovered from the microwave acid leaching solution Copper, selenium and tellurium;

[0036] (2) Pressurized acid leaching: add 200g / L dilute sulfuric acid to the microwave acid leaching residue to adj...

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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...

Claims

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Application Information

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Owner NORTHEASTERN UNIV
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