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Multi-metal comprehensive recovery process for arsenic-containing smoke dust

A polymetallic, soot technology, applied in the direction of improving process efficiency, can solve the problems of hidden pollution, high energy consumption of pyrotechnic process, unreasonable economic technology, etc., to eliminate the impact of environmental pollution and not produce secondary pollution , the effect of improving economic efficiency

Active Publication Date: 2014-08-13
甘肃高能中色环保科技有限公司
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  • Abstract
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Problems solved by technology

The arsenic in the leaching solution is finally landfilled in the form of precipitated iron arsenate, which does not make the resource utilization of arsenic, and forms a new pollution hazard
The sulfuric acid leaching of leaching slag in the process of pyrometallurgical lead smelting, combined with a large amount of sulfate radicals, will produce sulfur dioxide flue gas pollution; during the pyroprocessing process, low melting point metals such as zinc enter the fume, the purity of arsenic trioxide cannot be guaranteed, and the pyrotechnic process consumes more energy High, unreasonable economic technology
The existing pyrotechnics and wet hair processes usually only recover 1-2 kinds of metal elements while arsenic is being treated, and various problems have appeared in the process of industrial application due to environmental protection, technological rationality, economical and other issues

Method used

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  • Multi-metal comprehensive recovery process for arsenic-containing smoke dust

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Arsenic-containing soot polymetallic comprehensive recovery process, the specific steps are:

[0025] (1) Selective leaching: Slurry 10kg of arsenic-containing soot with water and add it to the leaching tank, then add the leaching agent and stir. The leaching agent is an aqueous solution with an initial mass fraction of 10%, and the liquid-solid weight ratio is 2:1 , the leaching temperature is 35°C, the leaching time is 4 hours, and filtered to obtain the leaching solution and leaching residue;

[0026] The solute components and weight ratio of the leaching agent are:

[0027] (NH 4 ) 2 SO 4 :65%, MnO 2 : 15%, H 2 o 2 : 20%;

[0028] (2) Extraction, back-extraction and electrowinning: In step (1), the leaching liquid is firstly extracted with LIX841 and 260# kerosene mixed organic phase to extract copper, the extraction ratio is 2:1, the extraction temperature is 40°C, and the clarification time is 5min, and the organic phase is used 150-200g / L sulfuric acid so...

Embodiment 2

[0035] The arsenic-containing soot from a domestic non-ferrous metal smelting enterprise is selected. The important metal components and their mass fractions or contents are: Cu 8%, Pb 36%, Zn 12%, As 9%, In 0.022%, Bi 2.86%, Au 0.8 g / t, Ag 126g / t.

[0036] (1) Selective leaching: Slurry 10kg of the above-mentioned arsenic-containing soot into the leaching tank, then add the leaching agent and stir. The initial mass fraction of the leaching agent is 15%, and the liquid-solid weight ratio is 3:1. The temperature is 35°C, the leaching time is 4 hours, and the leaching solution and leaching residue are obtained by filtering;

[0037] The composition and weight ratio of the leaching agent are:

[0038] (NH 4 ) 2 SO 4 :50%, MnO 2 : 20%, H2 o 2 : 30%;

[0039] (2) Extraction, stripping and electrowinning: in step (1), the leaching solution is firstly extracted with LIX841 and 260# kerosene mixed organic phase to extract copper, the extraction ratio is 2:1, the extraction temp...

Embodiment 3

[0047] Embodiment 3: the composition and weight proportion of leaching agent are: (NH 4 ) 2 SO 4 :40%, MnO 2 : 35%, H 2 o 2 : 25%; the solute component and weight ratio of the mixed arsenic removal agent are: H 2 o 2 : 45%, Na 2 S 2 o 3 : 55%. All the other steps are the same as in Example 1.

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Abstract

The invention provides a multi-metal comprehensive recovery process for arsenic-containing smoke dust. According to the process, leachate containing zinc and copper and leaching slag containing arsenic and lead are obtained through selective leaching, the leachate is extracted by respectively using a copper extraction agent and a zinc extraction agent, and then reverse extraction and electrodeposition are carried out so as to obtain copper and zinc; the leaching slag is leached with a mixed arsenic removing agent consisting of H2O2 and Na2S2O3 so as to obtain arsenic-containing leachate and lead-containing arsenic-removed leaching slag, the arsenic-containing leachate is concentrated and crystallized so as to obtain sodium arsenate, and the lead-containing arsenic-removed leaching slag is subjected to pyrogenic process lead extraction and electrolytic refining so as to obtain lead. According to the invention, the multi-metal comprehensive recovery process uses combined hydrometallurgy and pyrometallurgy, comprehensive recovery process and a main smelting system are effectively combined together, seamless butt joint of a part of technology and main process technology is realized, process steps are environment-friendly, metallic copper, zinc and lead are effectively recovered, and resourceful treatment of arsenic is realized.

Description

technical field [0001] The invention relates to the field of nonferrous metal smelting, in particular to a comprehensive recycling process of arsenic-containing soot in the nonferrous metal smelting process. Background technique [0002] my country is the largest producer of non-ferrous metals in the world, and the soot produced by non-ferrous metal pyrometallurgy reaches millions of tons every year. Due to the high temperature of pyro-smelting, low-melting metals such as arsenic, zinc, and lead contained in the concentrate also volatilize into the smoke and dust. These valuable metal elements are resources with considerable economic value. Every year in my country, hundreds of thousands of tons of arsenic are discarded in the form of arsenic-containing tailings and waste residues in the mining, dressing and smelting of copper, lead, zinc and other non-ferrous metals, resulting in a large amount of arsenic that pollutes the environment and even source of water, endangering h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B13/00C22B15/00C22B19/00
CPCY02P10/20
Inventor 鲁兴武何国才蒲敬文李俞良易超张恩玉陈文波马爱军邵传兵孟阔程亮纪武仁赵宏曹桂银韩晓龙
Owner 甘肃高能中色环保科技有限公司
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