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Low-grade copper ore bioleaching solution treatment method

A bioleaching, low-grade technology, applied in photographic crafts, instruments, photographic auxiliary crafts, etc., can solve the problems of increasing energy consumption, affecting the copper extraction rate, interfacial emulsification, etc. Simple and efficient operation

Active Publication Date: 2015-04-22
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the leaching-solvent extraction-electrowinning (L-SX-EW) wet copper smelting process, the copper leaching solution is extracted and the raffinate is returned to leaching. The disadvantage of this is that the iron ions in the leaching solution gradually accumulate, which will lead to Severe interfacial emulsification occurs during the solvent extraction process, which affects the extraction rate of copper, and the iron that enters the electrowinning system through entrainment and chemical extraction will reduce the current efficiency of the cathode electrode and affect the quality of the copper.
In addition, if the raffinate mixed with some organic matter is directly sprayed onto the copper ore, it will inhibit the growth of copper-leaching bacteria in the ore and affect the leaching rate.
In addition, as the grade of copper ore decreases, the concentration of copper ions in the leaching liquid entering the extraction process is far lower than the design requirements of the hydrometallurgy process, which reduces the production capacity of the hydrometallurgy plant and increases energy consumption.

Method used

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Effect test

Embodiment 1

[0032] The low-grade copper ore biological leaching solution processed by the present invention, stock solution component Cu 2+ =0.14g / L, Fe 3+=0.5g / L, pH=2.2, add sodium phosphate solution to low-grade copper ore bioleaching liquid, adjust pH=1.5 with sulfuric acid, reaction temperature T=30℃, speed ω=300r / min, reaction time t=0.5h , standing time t=0.5h, filtering to obtain ferric phosphate filter residue and copper-containing filtrate, the iron removal rate is 99%, and the copper loss rate is 2%. Iron phosphate slag is added to sodium hydroxide solution, under the conditions of pH=10, reaction temperature T=80°C, speed ω=300r / min, reaction time t=2h, standing time t=0.5h, filter to convert it into hydrogen Iron oxide precipitation and sodium phosphate solution, sodium phosphate solution is returned to the initial iron removal process to continue to use, the recovery rate of phosphate is 95%.

[0033] The copper-containing filtrate is subjected to ultrafiltration treatment...

Embodiment 2

[0038] The low-grade copper ore biological leaching solution processed by the present invention, stock solution component Cu 2+ =0.28g / L, Fe 3+ =0.6g / L, pH=2.5, add sodium phosphate solution to low-grade copper ore bioleaching solution, adjust pH=1.8 with sulfuric acid, reaction temperature T=30℃, speed ω=300r / min, reaction time t=0.5h , standing time t=0.5h, filtering to obtain ferric phosphate filter residue and copper-containing filtrate, the iron removal rate is 99%, and the copper loss rate is 2%. Iron phosphate slag is added to sodium hydroxide solution, under the conditions of pH=10, reaction temperature T=80°C, speed ω=300r / min, reaction time t=2h, standing time t=0.5h, filter to convert it into hydrogen Iron oxide precipitation and sodium phosphate solution, sodium phosphate solution is returned to the initial iron removal process to continue to use, the recovery rate of phosphate is 95%.

[0039] The copper-containing filtrate is subjected to ultrafiltration treatm...

Embodiment 3

[0044] The low-grade copper ore biological leaching solution processed by the present invention, stock solution component Cu 2+ =0.19g / L, Fe 3+ =0.6g / L, pH=2.3, add potassium phosphate solution to low-grade copper ore bioleaching solution, adjust pH=1.5 with sulfuric acid, reaction temperature T=30℃, speed ω=300r / min, after reaction time t=0.5h , standing time t=0.5h, filtering to obtain ferric phosphate filter residue and copper-containing filtrate, the iron removal rate is 99%, and the copper loss rate is 2%. Iron phosphate slag is added to potassium hydroxide solution, under the conditions of pH=10, reaction temperature T=80°C, speed ω=300r / min, reaction time t=2h, standing time t=0.5h, filter to convert it into hydrogen Iron oxide precipitation and potassium phosphate solution, the potassium phosphate solution is returned to the initial iron removal process to continue to use, and the recovery rate of phosphate is 95%.

[0045] The copper-containing filtrate is subjected...

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Abstract

The invention provides a low-grade copper ore bioleaching solution treatment method. High-efficiency iron removal is realized under the low-pH value condition by adopting a phosphate process, the leaching solution is purified, and an iron removal agent is recycled. The valuable metal (Cu) ions in the leaching solution are simply and effectively enriched by virtue of the ultrafiltration and nanofiltration membrane technology, and the subsequent extraction and electrodeposition process efficiency are improved. In addition, the raffinate is recycled by virtue of a three-dimensional electrolysis technology, the valuable metal (Cu) in the raffinate is recycled, the entrained organic phase is removed, and a certain economic benefits and environmental benefits can be obtained. The whole process is clean and high-efficiency, so that the copper hydrometallurgy enterprises can develop into high-resource utilization and environment-friendly enterprises.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, relates to a hydrometallurgy process, in particular to a method for treating low-grade copper ore biological leachate. Background technique [0002] In the leaching-solvent extraction-electrowinning (L-SX-EW) wet copper smelting process, the copper leaching solution is extracted and the raffinate is returned to leaching. The disadvantage of this is that the iron ions in the leaching solution gradually accumulate, which will lead to Severe interfacial emulsification occurs during the solvent extraction process, which affects the extraction rate of copper, and the iron that enters the electrowinning system through entrainment and chemical extraction will reduce the current efficiency of the cathode electrode and affect the quality of the electrolytic copper. In addition, if the raffinate mixed with some organic matter is directly sprayed onto the copper ore, it will inhibit the growth of copper-leach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B3/44C22B3/22C22B15/00C25C1/12
CPCY02P10/20
Inventor 刘久清周钦
Owner CENT SOUTH UNIV
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