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A method for recovering arsenic and valuable metals from arsenic-containing soot

A technology for recovering valuable metals and arsenic, applied in chemical instruments and methods, arsenic oxide/arsenic hydroxide/oxyacid arsenic, arsenic compounds, etc. Secondary pollution and other problems can be achieved to improve the reduction efficiency and recovery rate

Active Publication Date: 2022-07-26
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0003] Chinese patent (201711425881.1) discloses a process for separating antimony and arsenic from antimony and arsenic soot. This method is not only costly, but also because the solution is not purified, the heavy metal impurities in it will also be mixed in the crystallization
This method will cause part of the arsenic in the solution to precipitate in the form of arsenic sulfide when sodium sulfide precipitates copper, thereby reducing the recovery rate of arsenic in the entire system, and will also cause certain harmful element arsenic to be contained in the copper sulfide precipitate, which will affect the system. The quality of process copper sulfide products
Chinese patent (2013100919281.6) discloses a method for recovering arsenic from arsenic-containing soot, which uses dilute acid to leach arsenic-containing soot, and then directly reduces the arsenic in the solution with anhydrous sodium sulfite or sulfur dioxide, and then directly cools at low temperature Crystallization, this method does not consider the problem of waste water open circuit after arsenic recovery, sulfuric acid or hydrochloric acid and sulfur dioxide or sodium sulfite and other reagents are used in the whole process, and the inorganic salt ions in it will inevitably remain in the leachate. This method recovers arsenic in the waste water Contains a large amount of inorganic salts, unprecipitated heavy metals, and harmful element arsenic remaining in the solution, so this arsenic recovery method does not solve the problem of secondary environmental pollution after arsenic recovery

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Take 100 g of arsenic-containing copper soot, including 15.32% arsenic, 5.12% copper, 10.62% zinc, 14.86% lead, 3.21% bismuth, 1.26% antimony, and 1.53% tin.

[0041] (2) Add 10 mL of sulfuric acid, 30 mL of hydrogen peroxide, and 260 mL of water to the soot, and leaching for 3 hours at a leaching temperature of 85 °C. After the leaching is complete, the leaching residue and leaching solution are obtained by filtration. Lead, bismuth, antimony, and tin are all left in the leaching residue. , the recovery rates of lead, bismuth, antimony, and tin are 99.32%, 96.13%, 90.16%, and 95.32%, respectively.

[0042] (2) Add 20 mL of sulfuric acid to the leaching solution and then feed 30 g of sulfur dioxide (SO 2 The feeding speed is 50 mL / min), after the addition of sulfur dioxide, the stirring reaction is continued for 0.5 h, then 28 mL of sulfuric acid is added, and the solution is placed in a cooling chamber for stirring and cooling at 5 °C. After cooling for 1 hour, th...

Embodiment 2

[0046] (1) Take 100 g of arsenic-containing lead soot, including 20.53% arsenic, 0.53% copper, 12.33% zinc, 18.06% lead, 2.19% bismuth, 2.56% antimony, and 2.01% tin.

[0047] (2) Add 9 mL of sulfuric acid, 35 mL of hydrogen peroxide, and 256 mL of water to the soot, and leaching for 3 hours at a leaching temperature of 85°C. After the leaching is complete, filter the leaching residue and leaching solution. Lead, bismuth, antimony, and tin are all left in the leaching residue. , the recoveries of lead, bismuth, antimony and tin were 99.01%, 95.32%, 89.33% and 92.21%, respectively.

[0048] (2) After adding 22 mL of sulfuric acid to the leaching solution, feed 45 g of sulfur dioxide (SO 2 The feeding speed is 50mL / min), after the addition of sulfur dioxide, the reaction is continued to be stirred for 0.5h, then 30mL of sulfuric acid is added, and the solution is placed in a cooling chamber for stirring and cooling at 3°C. After cooling for 1 hour, filter to obtain arsenic trio...

Embodiment 3

[0052] (1) Take 100g of arsenic-containing tin soot, including 9.26% arsenic, 6.11% copper, 8.16% zinc, 15.33% lead, 7.83% bismuth, 3.62% antimony, and 9.13% tin.

[0053] (2) Add 12 mL of sulfuric acid, 35 mL of hydrogen peroxide, and 253 mL of water to the soot, and leaching for 3 hours at a leaching temperature of 80°C. After the leaching is complete, the leaching residue and leaching solution are obtained by filtration. Lead, bismuth, antimony, and tin are all left in the leaching residue. , the recovery rates of lead, bismuth, antimony, and tin are 99.52%, 96.13%, 92.16%, and 93.16%, respectively.

[0054] (2) Add 20 mL of sulfuric acid to the leaching solution and feed 25 g of sulfur dioxide (SO 2 The feeding speed is 50mL / min), after the addition of sulfur dioxide, the reaction is continued to be stirred for 0.5h, then 30mL of sulfuric acid is added, and the solution is placed in a cooling chamber for stirring and cooling at 3°C. After cooling for 1 hour, filter to obt...

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Abstract

The invention discloses a method for recovering arsenic and valuable metals from arsenic-containing soot. The method is that arsenic-containing soot is leached by acid oxidation, arsenic, copper and zinc enter into solution, and bismuth, lead, antimony and tin enter into slag phase ; The leaching solution selectively reduces arsenic by sulfur dioxide gas and recovers arsenic in the form of arsenic trioxide, and the remaining copper and zinc-containing solution is sulfided and precipitated by hydrogen sulfide gas to obtain copper-enriched slag and zinc-containing solution; Concentrate and crystallize to obtain zinc sulfate heptahydrate product, and the crystallization mother liquor is returned to the leaching process of arsenic-containing soot; the method efficiently recovers arsenic in the arsenic-containing soot in the form of high-grade arsenic trioxide, and separates and recovers copper and zinc, and obtains lead, Bismuth, tin, antimony and other enriched slag are used as raw materials for lead smelting. In the whole production process, no industrial waste water is discharged, and no worthless hazardous waste is produced, which is beneficial to the comprehensive management of hazardous waste.

Description

technical field [0001] The invention relates to a method for treating arsenic-containing soot, in particular to a method for comprehensively recovering arsenic and valuable metals from arsenic-containing soot, and belongs to the technical field of metallurgical solid waste treatment. Background technique [0002] In the process of non-ferrous metal smelting, a small amount of arsenic in non-ferrous concentrates will be enriched in soot from various metal smelting, such as copper soot, lead soot, bismuth soot, tin soot, antimony soot, etc. Due to the high arsenic content in these soots, they are hazardous wastes, and long-term storage or improper handling will seriously pollute the environment. In addition to arsenic, these soots also contain some valuable metals such as lead, copper, zinc, tin, bismuth, antimony, indium and other metals, which have certain recycling value. [0003] Chinese patent (201711425881.1) discloses a process method for separating antimony and arseni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B15/00C22B19/30C22B19/20C22B30/04C01G28/00C01G9/06
CPCC22B7/02C22B7/007C22B30/04C22B15/0071C22B15/0093C22B19/22C22B19/30C01G28/005C01G9/06Y02P10/20
Inventor 周康根陈伟张二军彭长宏
Owner CENT SOUTH UNIV
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