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A kind of process method of alkaline wet leaching copper from matte slag

A process method and matte technology, applied in the field of alkaline wet leaching of copper, can solve the problems of purification and enrichment of leaching solution, high volatility of ammonia, slow microbial leaching speed, etc. The effect of efficiency

Active Publication Date: 2022-06-07
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical leaching methods include sulfate leaching, ammonia leaching and microbial leaching, etc.; sulfate leaching uses sulfuric acid to directly leach copper in copper slag, but during the leaching process, fayalite and quartz phases in copper slag are leached. The large consumption of sulfuric acid, on the one hand, the leaching of iron and other elements also cause the subsequent purification of the leaching solution and the difficulty of copper enrichment; the ammonia leaching method uses the complexation of ammonia and copper, but due to the high volatility of ammonia, a closed leaching environment is required In addition, elements such as Zn, Cd, and Ni in copper slag can be leached, and the leaching conditions and the subsequent separation process of each element need to be reasonably controlled; microbial leaching is generally used in the leaching of low-grade refractory sulfide ores and oxide ores. It can be used to extract copper from copper slag, but at present its disadvantages are slow microbial leaching speed, long production cycle, and the cultivation of microbial strains is also the main problem that limits its application

Method used

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  • A kind of process method of alkaline wet leaching copper from matte slag
  • A kind of process method of alkaline wet leaching copper from matte slag
  • A kind of process method of alkaline wet leaching copper from matte slag

Examples

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Effect test

Embodiment 1

[0062] The ice copper slag used is slow cooling slag, of which the copper content is 0.2%.

[0063] (1) Grinding ore: the crushing, grinding and sieving of ice copper slag to the particle size of less than 0.074mm accounts for 90%;

[0064] (2) Oxidation roasting: the ice copper slag that meets the requirements of the screening is put into the high-temperature muffle furnace, and the oxidation roasting is carried out for 30 minutes at a temperature of 500 ° C, and then taken out for cooling;

[0065] (3) Alkaline leaching:

[0066] The concentration of glycine extractant is 50g / L, and the pH of the extractant solution is adjusted to 10 by using sodium hydroxide solution; The prepared glycine extractant was mixed with the slag after roasting according to the liquid-solid ratio of 5:1, heated to 40 °C, and leached for 1 hour under mechanical stirring of 50 revolutions per minute, and the copper leaching rate reached 50%; The leaching slurry is filtered by the plate and frame filtrat...

Embodiment 2

[0070] The ice copper slag used is quenched slag, of which the copper content is 0.5%.

[0071] (1) Grinding ore: the crushing, grinding and sieving of ice copper slag to the particle mass of less than 0.074mm accounts for 95%;

[0072] (2) Oxidation roasting: the ice copper slag that meets the requirements of the screening is put into the high-temperature muffle furnace, and the oxidation roasting is carried out for 60 minutes under the condition of temperature 550 °C, and then taken out for cooling;

[0073] (3) Alkaline leaching:

[0074] The concentration of the glycine extract is 100g / L, and the pH of the extractant solution is adjusted to 10.5 by using sodium hydroxide solution; the prepared glycine extractant is mixed with the slag after roasting according to the liquid-solid ratio of 10:1, heated to 60 °C, leached for 5 hours under mechanical stirring of 150 revolutions per minute, and the copper leaching rate reaches 70%; The leaching slurry is filtered by the plate and f...

Embodiment 3

[0078] The ice copper slag used is quenched slag, of which the copper content is 1.5%.

[0079] (1) Grinding ore: the crushing, grinding and sieving of ice copper slag to the particle mass of less than 0.074mm accounts for 95%;

[0080] (2) Oxidation roasting: the ice copper slag that meets the requirements of the screening is put into the high-temperature muffle furnace, and the oxidation roasting is carried out for 90 minutes at a temperature of 600 ° C, and then taken out for cooling;

[0081] (3) Alkaline leaching:

[0082] The concentration of glycine extractant is 150g / L, and the pH of the extractant solution is adjusted to 11 by using sodium hydroxide solution; The prepared glycine extractant was mixed with the slag after roasting according to the liquid-solid ratio of 15:1, heated to 75 °C, leached for 10 hours under mechanical stirring of 200 revolutions per minute, and the copper leaching rate reached 75%; The leaching slurry is filtered by the plate and frame filtration d...

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Abstract

The invention relates to a process method for alkaline wet leaching of copper from matte slag, belongs to the technical field of copper recovery, and solves the problems of difficulty and high cost in recovering copper from matte slag. In the process method of the present invention, the content of copper in the matte slag is between 0.2~5wt%, comprising the following steps: step 1. grinding and sieving the matte slag to obtain the matte slag to be treated; step 2. The matte slag to be treated is oxidized and roasted to obtain roasted slag; Step 3. Configure glycine leaching agent, and use alkaline solution to adjust the pH of the leaching agent; Step 4. Leaching process: mix roasted slag and glycine leaching agent for copper leaching Step 5. Copper precipitation process: mix copper-containing glycine solution and oxalic acid solution for copper precipitation, and filter to obtain copper oxalate precipitation and glycine solution; Step 6. Roasting decomposition: put the copper oxalate precipitation into a high-temperature roaster after washing, Heating and decomposing under gas protection to obtain copper powder. The invention can realize efficient leaching and recovery of copper in matte slag.

Description

Technical field [0001] The present invention belongs to the field of copper recovery technology, particularly relates to a process method for leaching copper from the alkaline wet method of copper slag. Background [0002] At present, pyro-smelting is the main process for the production of copper, and its refined copper production accounts for about 80% of the world's copper production. Using this method of copper smelting, every 1 ton of refined copper produced will produce about 2.2 tons of copper slag, and the amount of copper slag produced in China every year is as high as 15 million tons. Ice copper slag is the metallurgical slag of the smelting process of copper smelting by fire smelting, as a typical secondary resource, the grade of copper is mostly higher than 0.5%, which is much higher than the grade of copper mining in China (0.3%), with high development potential and recycling value. [0003] The recycling technology of copper in copper slag mainly includes chemical le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/02C22B15/00
CPCC22B7/04C22B7/008C22B1/02C22B15/0089C22B15/0065Y02P10/20
Inventor 曹亦俊黄宇坤范桂侠彭伟军李超李国胜
Owner ZHENGZHOU UNIV
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