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Degradation treatment process for waste residues of cyanide tailings

A treatment process, the technology of cyanide tailings, applied in the field of degradation treatment of cyanide tailings waste, can solve the problems of poor mass transfer between cyanide tailings and oxidants, etc., to overcome the harsh pressure requirements, increase the contact area, The effect of process safety

Active Publication Date: 2014-12-10
FUJIAN SHUANGQISHAN MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a treatment scheme for cyanide tailings. The present invention uses a combination of hydrolysis and oxidation processes to solve the problem of poor mass transfer between cyanide tailings and oxidants through a drum reactor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put the cyanide tailings containing cuprous thiocyanide into the rotary drum autoclave, vacuumize for half an hour after sealing, keep the vacuum at minus 0.09MPa, and then empty it. After emptying, feed water steam into the rotary drum autoclave, adjust the rotation speed of the autoclave to 30 rpm, adjust the water vapor pressure to keep the temperature at 140°C and start curing. After 3 hours of constant pressure curing, adjust the steam The pressure is about 0.2MPa, so that the temperature in the autoclave is kept at 120-130°C (the pressure is only for the convenience of adjusting and indicating, and the temperature in the autoclave shall prevail). Then feed ozone into the air inlet of the autoclave (ozone comes from an ozone generator), adjust the pressure of the ozone to maintain balance with the pressure in the autoclave, connect the gas outlet of the autoclave to an ozone destroyer, and keep the pressure for 1 hour. After oxidation, adjust the rotation speed of ...

Embodiment 2

[0038] Put the cyanidation tailings containing Prussian blue into the rotary drum autoclave, seal it and then vacuum it for half an hour, keep the vacuum at minus 0.06MPa, and then empty it. After emptying, feed water steam into the rotary drum autoclave, adjust the rotation speed of the autoclave to 40 rpm, adjust the water vapor pressure to keep the temperature at 150°C and start curing. After 4 hours of constant pressure curing, adjust the steam The pressure is about 0.2MPa, so that the temperature in the autoclave is kept at 120-130°C (the pressure is only used as an auxiliary indicator for adjusting the temperature, and the temperature in the autoclave shall prevail). Then pass ozone into the air inlet of the autoclave (ozone comes from the ozone steel cylinder), adjust the pressure of the ozone to maintain balance with the pressure in the autoclave, connect the gas outlet of the autoclave to an ozone destroyer, and keep the pressure for 2 hours. After oxidation, adjust t...

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PUM

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Abstract

The invention provides a degradation treatment process for waste residues of cyanide tailings. The degradation treatment process comprises the following steps: firstly, filling the waste residues of the cyanide tailings into a rotary drum type still kettle, hydrolyzing by virtue of vapor to remove a part of cyanides,; and then, lowering pressure of the vapor and introducing ozone to oxidize and further remove the cyanides at the same time. According to the degradation treatment process, a hydrolysis process and an oxidization process are combined, so that a problem that the mass transfer of the cyanide tailings and an oxidant is solved by virtue of the rotary barrel type reactor. The degradation treatment process is low in requirement on pressure of equipment, low in a vapor temperature, gentle in a reaction condition and low in process cost.

Description

technical field [0001] The invention belongs to the field of chemical environmental protection, and in particular relates to a degradation treatment process of cyanide tailing residue. Background technique [0002] In the gold smelting industry, the current cyanide gold extraction process produces a large amount of toxic cyanide-containing wastewater and tailings slurry. [0003] Among the many methods and processes of gold smelting, the most commonly used method in the world is the gold extraction process of cyanidation leaching. [0004] The cyanidation leaching gold extraction process has been widely used all over the world since it was applied in 1887 due to its high recovery rate of gold extraction, strong adaptability to ore, simple process operation, and low cost. By 2001, 80% of the world The above newly-built gold smelters still adopt the cyanide leaching method. [0005] But the cyanide used for cyaniding gold has a formidable toxicity. [0006] The cyanidation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08A62D3/20A62D101/45
CPCY02P10/20
Inventor 郑新烟谢文清肖坤明
Owner FUJIAN SHUANGQISHAN MINING
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