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Novel technology for improving gold and silver cyanidation recovery rates by arsenic-containing acid leaching residue pre-treatment

A technology of pretreatment and leaching slag, which is applied in the direction of improving process efficiency, etc., can solve the problems of stricter arsenic requirements and lower leaching rate, and achieve significant economic benefits, low cost, and simple process operation

Inactive Publication Date: 2014-09-10
薛光 +2
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Problems solved by technology

[0002] At present, the domestic recovery of gold and silver from arsenic-containing acid leaching residues usually adopts the cyanide leaching process, which is simple and easy, and the leaching rate of gold is 90% to 95%, and the leaching rate of silver is 60% to 70%. , but the requirements for arsenic are relatively strict (0.2% to 0.3%), and with the increase of arsenic content, the leaching rate of gold and silver decreases significantly

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  • Novel technology for improving gold and silver cyanidation recovery rates by arsenic-containing acid leaching residue pre-treatment
  • Novel technology for improving gold and silver cyanidation recovery rates by arsenic-containing acid leaching residue pre-treatment

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Embodiment Construction

[0016] The arsenic-containing acid leaching residue of a gold smelter was selected, its chemical composition: Au 50.05 (1×10 -6 ), Ag 130.69 (1×10 -6 ), Cu 0.21%, Pb 1.29%, Zn 1.10%, As 0.47%, Fe 28.5%, S 0.50%.

[0017] 1 Add mixed reagent SD for regrinding

[0018] Weigh 1 kg of arsenic-containing acid leaching residue, add 30 g of mixed reagent SD, add water to adjust the slurry, the concentration is 45%, and grind on a ball mill for 20 minutes, the fineness of the ore sample reaches 0.043 mm and is greater than 90%.

[0019] 2 plus mixed reagent SE pre-dip impurity removal

[0020] Add mixed reagent SE to the regrinded pulp, stir and leach in the pre-soak tank for 4 hours, filter and wash the pulp, leaching gold and silver from the filter residue by cyanide method, add SF reagent to the filtrate to precipitate Cu, Pb, Zn, As and other metal ions, the supernatant is returned for reuse.

[0021] 3 Cyanide leaching of gold and silver

[0022] Put the filter residue in th...

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Abstract

The invention provides a novel technology for improving gold and silver cyanidation recovery rates by arsenic-containing acid leaching residue pre-treatment. The novel technology comprises the following steps of adding a mixed reagent SD into acid-leaching residue, carrying out re-milling by a bowl mill so that a ratio of ore sample having fineness of 0.043mm is greater than 90%, adding a mixed reagent SE into the milled ore pulp, carrying out stirring presoaking for 4h, carrying out solid-liquid separation to obtain leaching residue, and extracting gold and silver in mediums of NH4HCO3 and NaOH having a pH value approximately equal to 9.5 by a cyanidation method. Compared with the original technology, the novel technology has gold and silver recovery rates respectively improved by more than 2.0% and 10.0%. The novel technology has simple processes, low equipment investment and a low cost, solves the problem that gold and silver recovery rates of arsenic-containing acid leaching residue cyanidation leaching, and has good economic and social benefits.

Description

technical field [0001] The invention relates to a new process for improving the recovery rate of gold and silver cyanide by pretreatment of arsenic-containing acid leaching slag, and is particularly suitable for recovering gold and silver from arsenic-containing acid leaching slag. Background technique [0002] At present, the domestic recovery of gold and silver from arsenic-containing acid leaching residues usually adopts the cyanide leaching process, which is simple and easy, and the leaching rate of gold is 90% to 95%, and the leaching rate of silver is 60% to 70%. , but the requirements for arsenic are relatively strict (0.2% to 0.3%), and with the increase of arsenic content, the leaching rate of gold and silver decreases significantly. Contents of the invention [0003] The invention proposes a new process for improving the recovery rate of gold and silver cyanide by pretreatment of arsenic-containing acid leaching slag. The process is simple in operation, less in ...

Claims

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Application Information

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IPC IPC(8): C22B11/08C22B7/04
CPCY02P10/20
Inventor 薛光于永江王树芳
Owner 薛光
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