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Method for leaching Cu from alkaline glycinate solution

A technology of glycinate and glycine, which is applied in the field of metallurgy, can solve the problems of high acid consumption and affect the leaching efficiency, and achieve the effect of cheap medicine, simple operation and avoiding high acid consumption

Inactive Publication Date: 2017-11-28
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The leaching methods adopted for leaching copper from chalcopyrite mainly include chloride leaching, ammonia leaching, sulfate leaching, acid leaching, biological leaching, etc. Among them, acid leaching is the most important leaching method, but acid leaching has the following problems: 1. ) high acid consumption caused by gangue mineralization; 2) leaching of elemental sulfur passivated copper produced by acid leaching; 3) calcium, magnesium, iron, manganese, etc. affect leaching efficiency; 4) recovery of precious metals such as gold from leaching slag requires excessive Consumes more lye to switch from acidic to alkaline conditions

Method used

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  • Method for leaching Cu from alkaline glycinate solution
  • Method for leaching Cu from alkaline glycinate solution
  • Method for leaching Cu from alkaline glycinate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for leaching copper with alkaline glycinate solution includes the following steps:

[0017] (1) Add 10g chalcopyrite (all finely ground to -45μm) in a 1L stirring tank, make slurry, add 0.12mol / L glycine solution, add NaOH solution to adjust the pH to 10, at room temperature (about 23°C) Continue stirring for 8h, and the stirring intensity is 300r / min. Among them, the pulp concentration is 1%, and the glycine concentration after mixing is about 0.1mol / L (the water required for pulping mainly comes from glycine solution and NaOH solution. The amount of NaOH solution added is small, so the concentration of glycine solution is not greatly reduced);

[0018] (2) Filter the mixed solution after leaching in step (1), add NaS to the filtrate, stir and filter to obtain CuS precipitate;

[0019] (3) The most calculated copper leaching rate in chalcopyrite is 40.5%;

[0020] The CuS precipitate undergoes subsequent conventional reduction treatment to obtain copper.

Embodiment 2

[0022] A method for leaching copper with alkaline glycinate solution includes the following steps:

[0023] (1) Add 20g chalcopyrite (all finely ground to -37μm) in a 1L stirring tank, make slurry, add 0.21mol glycine solution, add NaOH solution to adjust the pH to 10.5, the concentration of the resulting ore slurry is 20%, after slurry adjustment The glycine concentration is about 0.2mol / L, keep the slurry temperature at 30℃, continue to stir for 12h, and the stirring intensity is 300r / min. Similarly, the water required for pulping mainly comes from glycine solution and NaOH solution. The amount of NaOH solution added is small, so the concentration of glycine solution is not reduced greatly;

[0024] (2) Filter the mixed solution after leaching in step (1), add NaS to the filtrate, stir and filter to obtain CuS precipitate;

[0025] (3) The most calculated copper leaching rate in chalcopyrite is 60.3%;

[0026] The CuS precipitate undergoes subsequent conventional reduction treatmen...

Embodiment 3

[0028] A method for leaching copper with alkaline glycinate solution includes the following steps:

[0029] (1) Add 40g chalcopyrite (all finely ground to -25μm) in a 1L stirring tank, and make pulp; add glycine to NaOH solution to make alkaline glycinate solution, and add the prepared alkaline glycinate solution to the slurry Here, adjust the slurry pH to 11, the resulting slurry concentration is 5%, the glycine concentration after slurry adjustment is 0.3mol / L, keep the slurry temperature at 40℃, continue stirring for 18h, and the stirring intensity is 200r / min. The source of the water needed in the slurry is the NaOH solution and the added water, and the amount of additional water needed to be adjusted according to the concentration of the NaOH solution;

[0030] (2) Filter the mixed solution after leaching in step (1), add NaS to the filtrate, stir and filter to obtain CuS precipitate;

[0031] (3) The most calculated copper leaching rate in chalcopyrite is 65.7%;

[0032] The Cu...

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Abstract

The invention discloses a method for leaching Cu from an alkaline glycinate solution. The method comprises steps as follows: (1) pulping Cu ore powder, adding glycine or a glycine solution prepared in advance to ore pulp, adding lye, adjusting pH of the pulp, stirring the pulp for leaching Cu, or adding glycine to a strong alkali solution to prepare an alkaline glycinate solution, adding the prepared alkaline glycinate solution to the ore pulp, adjusting pH of the pulp, and stirring the pulp to leach Cu; (2) performing solid-liquid separation on the mixed solution after leaching to obtain a Cu-containing liquid and waste residues; (3) treating the Cu-containing liquid: adding NaS or NaHS to the Cu-containing liquid to generate CuS precipitate, performing solid-liquid separation, performing a reduction reaction on the CuS-containing solid to obtain Cu, or treating the Cu-containing liquid by solvent extraction-electrodeposition to obtain Cu. The method has the beneficial effect that the problems of high acid consumption caused by leaching under the acidic condition and Cu leaching passivation by elemental S can be solved by leaching Cu in an alkaline environment.

Description

Technical field [0001] The patent of the invention relates to the field of metallurgical technology, in particular to a method for leaching copper with an alkaline glycinate solution. Background technique [0002] Copper is a very important non-ferrous metal and plays an irreplaceable role in all walks of life. About 70% of the currently available copper resources are in the form of chalcopyrite. [0003] The main leaching methods used to extract copper from chalcopyrite are chloride leaching, ammonia leaching, sulfate leaching, acid leaching, biological leaching, etc. Among them, acid leaching is the most important leaching method, but acid leaching has the following problems: 1 ) High acid consumption caused by gangue mineralization; 2) Leaching of elemental sulfur passivated copper produced by acid leaching; 3) Calcium, magnesium, iron, manganese, etc. affect the leaching efficiency; 4) The recovery of precious metal gold from the leaching residue requires excessive More consu...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B15/00
CPCC22B3/1625C22B15/0065Y02P10/20
Inventor 刘坤王婷霞王志丰柏亚林孙运礼包玺琳袁艳沈光坤
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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