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Method for recovering arsenic and valuable metals from arsenic-containing soot

A valuable metal, arsenic recovery technology, applied in chemical instruments and methods, arsenic oxide/arsenic hydroxide/oxyacid arsenic, arsenic compounds, etc. Secondary pollution and other problems, to achieve the effect of improving the recovery rate and improving the reduction efficiency

Active Publication Date: 2021-09-03
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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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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  • Method for recovering arsenic and valuable metals from arsenic-containing soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Take 100g 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 10mL of sulfuric acid, 30mL of hydrogen peroxide, and 260mL of water to the soot, and leach for 3 hours at a leaching temperature of 85°C. After the leaching is complete, filter to obtain the leach residue and leach solution. Lead, bismuth, antimony, and tin are all left in the leach residue , The recoveries of lead, bismuth, antimony, and tin were 99.32%, 96.13%, 90.16%, and 95.32%, respectively.

[0042] (2) After adding 20mL of sulfuric acid to the leaching solution, 30g of sulfur dioxide (SO 2 The feed rate is 50mL / min), after the addition of sulfur dioxide, continue to stir and react for 0.5h, then add 28mL of sulfuric acid, and put the solution into the cooling room for stirring and cooling at 5°C. After cooling for 1 hour, diarsenic trioxide and crystallized solution were obtained by fil...

Embodiment 2

[0046] (1) Take 100g 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 9mL of sulfuric acid, 35mL of hydrogen peroxide, and 256mL of water to the soot, and leach for 3 hours at a leaching temperature of 85°C. After the leaching is complete, filter to obtain the leach residue and leach solution. Lead, bismuth, antimony, and tin are all left in the leach residue , The recoveries of lead, bismuth, antimony, and tin were 99.01%, 95.32%, 89.33%, and 92.21%, respectively.

[0048] (2) After adding 22mL of sulfuric acid to the leaching solution, 45g of sulfur dioxide (SO 2 The feed rate is 50mL / min), after the addition of sulfur dioxide, continue to stir and react for 0.5h, then add 30mL of sulfuric acid, and put the solution into the cooling room to stir and cool under the condition of 3°C. After cooling for 1 hour, filter to obtain diarsenic trioxide and crystallized liqu...

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 12mL of sulfuric acid, 35mL of hydrogen peroxide, and 253mL of water to the soot, and leach for 3 hours at a leaching temperature of 80°C. After the leaching is complete, filter to obtain the leach residue and leach solution. Lead, bismuth, antimony, and tin are all left in the leach residue , The recoveries of lead, bismuth, antimony, and tin were 99.52%, 96.13%, 92.16%, and 93.16%, respectively.

[0054] (2) After adding 20mL of sulfuric acid to the leaching solution, 25g of sulfur dioxide (SO 2 The feed rate is 50mL / min), after the addition of sulfur dioxide, continue to stir and react for 0.5h, then add 30mL of sulfuric acid, and put the solution into the cooling room to stir and cool under the condition of 3°C. After cooling for 1 hour, filter to obtain diarsenic trioxide and crystallized solut...

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Abstract

The invention discloses a method for recovering arsenic and valuable metals from arsenic-containing soot. The method comprises the following steps: leaching the arsenic-containing soot through acid oxidation, enabling arsenic, copper and zinc to enter a solution, and enabling bismuth, lead, antimony and tin to enter a slag phase; selectively reducing arsenic from leachate through sulfur dioxide gas, recovering arsenic in the form of arsenic trioxide, and vulcanizing and precipitating the remaining solution containing copper and zinc through hydrogen sulfide gas to obtain copper-enriched slag and a zinc-containing solution; and performing purifying and impurity removal on the zinc-containing solution, performing concentrating and crystallizing to obtain a zinc sulfate heptahydrate product, and returning crystallization mother liquor to the arsenic-containing soot leaching process. According to the method, the arsenic in the arsenic-containing soot is efficiently recovered in the form of high-grade arsenic trioxide, the copper and the zinc are separated and recovered, enriched slag of lead, bismuth, tin, antimony and the like is obtained to serve as lead smelting raw materials, no industrial wastewater is discharged in the whole production process, no valuable hazardous waste is generated, and comprehensive treatment of the hazardous waste is facilitated.

Description

technical field [0001] The invention relates to a treatment method for 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 the soot of various metal smelting, such as copper soot, lead soot, bismuth soot, tin soot, antimony soot, etc. Due to the high content of arsenic in these soot, it belongs to hazardous waste, and long-term storage or improper treatment will seriously pollute the environment. In addition to containing arsenic, these soot also contain some valuable metals such as lead, copper, zinc, tin, bismuth, antimony, indium and other metals, which have a certain recovery value. [0003] Chinese patent (201711425881.1) discloses a process for separating antim...

Claims

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Application Information

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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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