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Method for recycling multiple metals through resource cooperative treatment of copper smelting white smoke dust and waste acid

A white smoke, polymetallic technology, applied in chemical instruments and methods, inorganic chemistry, arsenic compounds, etc., can solve the problems of increased processing burden and poor separation effect, and achieve the effects of low cost, fast settling speed and high reactivity

Pending Publication Date: 2021-07-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wet process has problems such as poor separation of valuable metals in the subsequent solution. Although the current wet process has made progress in the separation of valuable metals, most of the arsenic is still separated in the form of hazardous waste residues of arsenic sulfide slag. processing burden

Method used

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  • Method for recycling multiple metals through resource cooperative treatment of copper smelting white smoke dust and waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Soot and polluted acid produced during the smelting process of a copper concentrate oxygen-enriched bottom blowing smelting pool in a domestic enterprise, the main components of copper soot are (%): Pb 24.9, Cu 14.2, As 5.8, Bi 2.5, Zn 2.5, Fe 1.4. The main components of dirty acid are (g / L): As 2.1, Cu 0.5, Bi 0.3, H 2 SO 4 205. Dilute the polluted acid by one time and cooperate with copper soot for leaching. The leaching conditions are: solid-to-liquid ratio 1:5, leaching temperature 25°C, leaching time 1h. The leaching rate of copper and arsenic in the leaching solution is more than 99%, and the leaching rate of arsenic is more than 85%. The lead and bismuth are basically all entered into the slag, and the grades of lead and bismuth slag are 54.2% and 5.2% respectively.

[0045] The slow-release vulcanizing agent used is prepared by the following method: MnSO 4 with Na 2 S 2 o 3 According to molar ratio 1.2:1, react 30min at room temperature, the tensio-activ...

Embodiment 2

[0048] The soot and lead smelting sewage acid produced by a domestic enterprise copper concentrate, the main components of copper soot, in mass percentage (%): Pb 36.6, Cu 8.2, As 14.3, Bi 1.6, Zn 3.5, Fe 0.7. The main components of dirty acid are (g / L): As3, Cu 2, Bi 0.5, H 2 SO 4 70. Synergistic oxidative leaching of polluted acid and copper soot, the leaching conditions are: 30% hydrogen peroxide 20mL / L as oxidant, solid-liquid ratio 1:3, leaching temperature 65°C, leaching time 1h. The leaching rate of copper and arsenic in the leaching solution is more than 99%, and the leaching rate of arsenic is more than 96%. The lead and bismuth are basically all entered into the slag, and the grades of lead and bismuth slag are 61.8% and 3.4% respectively.

[0049] The slow-release vulcanizing agent used is to calcinate excess iron powder and sulfur at a temperature of 350°C under a protective atmosphere. The molar ratio of iron powder to sulfur is 1.2:1; the protective atmosphere...

Embodiment 3

[0052] The soot and lead smelting sewage acid produced by a domestic enterprise copper concentrate, the main components of copper soot, in mass percentage (%): Pb 36.6, Cu 8.2, As 14.3, Bi 1.6, Zn 3.5, Fe 0.7. The main components of dirty acid are (g / L): As3, Cu 2, Bi 0.5, H 2 SO 4 70. Synergistic oxidative leaching of polluted acid and copper soot, the leaching conditions are: 30% hydrogen peroxide 20mL / L as oxidant, solid-liquid ratio 1:3, leaching temperature 65°C, leaching time 1h. The leaching rate of copper and arsenic in the leaching solution is more than 99%, and the leaching rate of arsenic is more than 96%. The lead and bismuth are basically all entered into the slag, and the grades of lead and bismuth slag are 61.8% and 3.4% respectively.

[0053] The slow-release vulcanizing agent used is to calcinate natural pyrite with a purity of 95% at a temperature of 550° C. under a protective atmosphere, and the protective atmosphere is nitrogen. The atmosphere used for ...

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Abstract

The invention discloses a method for recycling multiple metals through resource cooperative treatment of copper smelting white smoke dust and waste acid. The method comprises two routes of waste acid leaching of the copper smelting white smoke dust and waste acid gradient slow-release vulcanization. The method comprises the following steps of adopting waste acid leaching in the copper smelting white smoke dust, enabling leachate to have a replacement reaction by using active arsenic sulfide slag for copper precipitation, carrying out waste acid gradient slow-release vulcanization to obtain the active arsenic sulfide slag, carrying out reduction and cooling crystallization on an arsenic-rich solution after replacement and copper precipitation to obtain an arsenic dioxide product and a crystallization mother solution, and returning the crystallization mother solution to the process of preparing the active arsenic sulfide slag; and carrying out multi-metal extraction and wastewater purification and recycling on waste acid gradient slow-release sulfurized liquid. According to the method, products obtained through the two routes are interactively utilized to form closed circulation, waste recycling in the whole system is achieved, zero emission can be achieved in the whole process, the method is simple in process and low in cost, comprehensive resource recycling of valuable metal elements and arsenic in the waste acid and the copper smelting white smoke dust is achieved, and industrial application is facilitated.

Description

technical field [0001] The invention relates to a method for treating copper smelting white smoke and dirty acid, in particular to a method for synergistically treating copper smelting white smoke and dirty acid to recycle polymetallic resources, and belongs to the technical field of hydrometallurgy. Background technique [0002] During the pyro-smelting process of copper, a large amount of copper-containing waste slag will be produced. During the smelting process, a large number of volatile elements will be 2 Volatilization into the smoke dust, which will mechanically include some copper-containing substances, SO 2 It is used to produce sulfuric acid, and the soot will be collected by dust collection equipment before acid production, thus forming copper fume. At the same time, flue gas purification must be carried out before acid production, and a large amount of strongly acidic wastewater containing heavy metals will be produced in this process, referred to as dirty acid...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B15/00C22B19/30C22B19/20C22B13/00C22B30/04C22B30/06C01G28/00
CPCC01G28/005C22B7/007C22B7/02C22B13/045C22B15/0071C22B15/0091C22B19/22C22B19/30C22B30/04C22B30/06Y02P10/20
Inventor 韩海生张荥斐孙伟袁佳田佳杨越岳彤
Owner CENT SOUTH UNIV
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