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Oxygen pressure leaching and precious metal enrichment method for roasting acid leaching residues containing precious metals

A technology of oxygen pressure leaching and precious metals, applied to the improvement of process efficiency, instruments, optics, etc., can solve problems such as unsolvable environmental problems, limited ability of receiving copper system to return solution, large consumption of sulfuric acid, etc., to achieve technological and equipment Level improvement, good reference and promotion significance, and the effect of improving nickel direct recovery rate

Pending Publication Date: 2022-02-15
新疆新鑫矿业股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Rotary kiln sulfation roasting - dilute acid leaching daily processing capacity of 10t / d, unable to meet production needs
[0005] (2) The consumption of sulfuric acid in the prior art is large, the operating environment is poor, and the cost of flue gas treatment is high
[0006] (3) Due to system balance and other reasons in the nickel system, the ability to receive the copper system to return the solution is limited, and the red slag produced by the process cannot be fully processed
[0008] It is difficult to solve the existing problems with the existing technology, and it is necessary to increase the process and supporting equipment to increase the processing capacity, but the on-site environmental problems still cannot be solved

Method used

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  • Oxygen pressure leaching and precious metal enrichment method for roasting acid leaching residues containing precious metals
  • Oxygen pressure leaching and precious metal enrichment method for roasting acid leaching residues containing precious metals

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Oxygen pressure leaching is carried out as follows:

[0049] 7m into the slurry tank 3 After copper electrowinning, turn on the stirring, unload 5t of slag from the roasting and leaching slag frame, and its content is (%): Ni21, Cu12, Fe7.2, S6.3, Ba8, Au20, Ag1000, Pt10, Pd10.

[0050] Slurry in the pulping tank for more than 30min, then pour into the blending tank, according to L / S=7:1, initial acidity H 2 SO 4 Add 95g / L copper electrowinning solution and fresh water. After the slurry is finished, it is poured into the feeding trough. Use a booster pump to pump 30m through the slurry heater 3 In a titanium-lined 4-compartment autoclave, feed oxygen and stir for leaching. The leaching temperature is 150°C, the oxygen partial pressure is 0.2MPa, and the flow rate of the booster pump is 3.5m 3 / h.

[0051] The ore pulp after oxygen pressure leaching passes through the flash tank to cool down, flows into the cooling intermediate tank, and then enters the plate fram...

Embodiment 2

[0053] After leaching, slag (noble slag) smelting matte nickel enrichment precious metal is carried out according to the following steps:

[0054] The leached slag (noble slag) produced by pressure filtration is dried in a Φ500×8000 drying kiln at 180°C to a water content of 6%, and is used for smelting precious metal-containing nickel matte.

[0055] The dried leached slag (precious slag) and flux, etc. are added to the electric furnace according to the ratio of leached slag:quartz:limestone=6000:700:50, and the control conditions are: melting temperature: 1350°C, adding in batches, Slagging, smelting time 16h. After the smelting is completed, the melt is poured into the mold and left to cool, and the slag and nickel matte are separated. Matte nickel containing precious metals contains (%): Cu3.5, Ni43, Fe12, S21, Ag2.2, Au280g / t, Pt106g / t, Pd108g / t.

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Abstract

The invention belongs to the technical field of comprehensive recovery of roasting acid leaching residues, and discloses an oxygen pressure leaching and precious metal enrichment method for roasting acid leaching residues containing precious metals. The method comprises the following steps: slurrying and proportioning the roasting acid leaching residues containing precious metals by adopting copper electrode position post-liquid and fresh water, heating to 150-160 DEG C, introducing oxygen into a high-pressure kettle, performing leaching for 3-4 hours, and completing oxidation leaching of copper and nickel sulfide. According to the method, deep leaching of copper and nickel in roasting acid leaching residues containing precious metals is achieved, iron is oxidized and precipitated in the leaching process and enters smelting residues to neutralize enrichment of the precious metals in the smelting residues when the precious metals are smelted and enriched, and the iron is further enriched in the nickel matte smelting process to be used for recycling the precious metals; the method solves the problems that the roasting acid leaching residues are difficult to stockpile and transport, valuable metals in the leaching residues cannot be recycled and the like; and the method has the advantages of simple process flow, high valuable metal recovery rate, low energy consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of roasting acid leaching slag, and in particular relates to an oxygen pressure leaching and precious metal enrichment method of roasting acid leaching slag containing precious metals. Background technique [0002] At present, the roasted acid leaching slag produced by high-nickel matte wet-processed copper-nickel smelting, due to its complex composition, the conventional process adopts natural drying, then mixes sulfuric acid into the rotary kiln for sulphating and roasting-calcined sand dilute acid leaching-leach solution jarosite Iron removal process is carried out, iron slag is piled up and then returned to high nickel matte smelting, after iron removal, liquid is returned to nickel wet smelting - leaching slag smelting to recover precious metals. It is difficult to control the fugitive emissions of rotary kiln sulfate roasting, containing acid and SO 2 Flue gas treatment is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B23/00C22B11/00C25C1/12
CPCC22B7/04C22B7/006C22B7/001C22B11/023C22B11/044C22B23/0407C25C1/12Y02P10/20
Inventor 李江平马育新张宇飞陈泳李渭鹏孙斌马振楠周乒亚森.木萨蒋应平刘三平
Owner 新疆新鑫矿业股份有限公司
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