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A method for removing arsenic from arsenic-containing dust and recovering valuable metals

A valuable metal, arsenic fume technology, applied in chemical instruments and methods, process efficiency improvement, antimony compounds and other directions, can solve the problems of waste of resources, unavoidable fume and dust, etc., to extend service life, reduce installed power, reduce operation cost effect

Active Publication Date: 2020-10-27
无锡市华易环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the traditional fire method, this method reduces the secondary pollution of smoke and dust, but still cannot avoid the generation of a small amount of smoke and dust
[0004] Chinese patent CN103952563A discloses a method for removing arsenic from white smoke, which proposes mixing industrial sulfur with copper smelting smoke and then roasting to remove arsenic, but does not separate and purify the smoke containing arsenic, resulting in waste of resources
Chinese patent CN101928843A discloses a method for recovering arsenic by distillation in a DC submerged arc furnace, and proposes to use a DC submerged arc furnace to volatilize arsenic-containing materials, but does not separate and purify the arsenic-containing flue gas, resulting in waste of resources
Chinese patent CN104294053B discloses a method for reducing and volatilizing arsenic from arsenic-containing fumes, which proposes to mix a carbonaceous reducing agent with arsenic-containing raw materials and volatilize at 600°C, but does not separate and purify arsenic-containing fumes. cause waste of resources

Method used

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  • A method for removing arsenic from arsenic-containing dust and recovering valuable metals

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Experimental program
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Effect test

Embodiment 1

[0040] A main component of copper smelting fumes is as follows:

[0041] element As 2 o 3

[0042] Specific implementation process: mix the copper smelting dust and ferrous sulfide in a weight ratio of 1:0.8, put the mixed raw materials into the rotary kiln, and after the mixed raw materials are preheated and roasted at low temperature and volatilized at high temperature to remove arsenic, they are discharged from the kiln tail of the rotary kiln , the arsenic content in the tested material was 1.31%. The arsenic-containing flue gas obtained through the volatilization of the rotary kiln passes through the gravity settling chamber, and after the coarse dust is settled, the temperature drops to 450°C, and is filtered through a high-temperature membrane to obtain low-arsenic dust, which contains 0.27% arsenic, and the rest is Zn, Pb, Bi, Cu and other valuable metals. The passing flue gas is cooled to 110°C to 150°C, and dust is collected through a bag to obtain r...

Embodiment 2

[0044] The main components of a tin smelting fume are as follows:

[0045] element As sn Pb Element(%) 43.86 1.5 1.2

[0046] The specific implementation process: mix the tin smelting dust with carbonaceous reducing agent and ferrous sulfide in a weight ratio of 1:0.4:0.8, put it into the rotary kiln, and after the materials are preheated and roasted at low temperature and volatilized at high temperature to remove arsenic, the After the rotary kiln is discharged from the kiln, the arsenic content in the material is 0.29%. The arsenic-containing flue gas obtained through the volatilization of the rotary kiln passes through the gravity settling chamber, and after the coarse dust is settled, the temperature drops to 450°C, and is filtered through a high-temperature membrane to obtain low-arsenic dust, which contains 0.35% arsenic, and the rest is Pb, Sn, etc. valuable metals. The passing flue gas is cooled to 110°C-150°C, and dust is collected throug...

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Abstract

The invention discloses a method for removing arsenic in arsenic-containing smoke dust and recovering valuable metals, and belongs to the field of metallurgical environmental protection. The method for removing arsenic in arsenic-containing smoke dust and recovering the valuable metals has the effect of separating and purifying the arsenic-containing smoke dust to obtain refined white arsenic. According to the key points of the technical scheme, the method for removing arsenic in arsenic-containing smoke dust and recovering the valuable metals comprises the steps that raw materials are mixed;roasting and arsenic removing are carried out; filtration is carried out by a high temperature membrane, specifically, the arsenic-containing smoke gas obtained by roasting is filtered by the high-temperature membrane, the filtering temperature interval is controlled to be 250-600 DEG C to obtain low-arsenic smoke dust and filtered arsenic-containing smoke gas, and the low-arsenic smoke dust is returned to the raw material mixing step; initial cooling is carried out; and secondary cooling is carried out to obtain the refined white arsenic. According to the method for removing arsenic in arsenic-containing smoke dust and recovering the valuable metals, through filtration by the high-temperature membrane, the effects of prolonging the service life of a filtering membrane, reducing the operation cost of filtering equipment, reducing the total installed power and reducing the dust emission concentration after filtration can be achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, in particular to a method for removing arsenic from arsenic-containing smoke and recovering valuable metals. Background technique [0002] There are two sources of arsenic-containing smoke and dust: the roasting and smelting process of metal minerals such as copper, lead, zinc, tin, etc.; the pyroprocessing process of arsenic-containing non-ferrous metal smelting slag and wastewater treatment. Arsenic in soot mainly exists in the form of oxides, arsenates and arsenides, and a certain amount of arsenic-containing sulfides and elemental arsenic also exist. [0003] The existing treatment processes mainly include pyrotechnic process mainly based on high-temperature treatment, wet process mainly based on leaching, and combined pyro-wet process characterized by high-temperature alkali treatment. The fire process (volatility roasting method, reduction roasting method an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B7/02C22B19/20C22B19/30C22B13/02C22B15/00C22B25/02C22B25/06C22B30/04C22B30/06C01G30/00
CPCC01G30/00C01P2006/80C22B1/02C22B7/001C22B7/02C22B13/025C22B15/0006C22B19/20C22B19/30C22B25/02C22B25/06C22B30/04C22B30/06Y02P10/20
Inventor 钱斌赵志成
Owner 无锡市华易环境科技有限公司
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