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A method for comprehensive utilization of arsenic-containing smoke and dust and harmless disposal of arsenic

An arsenic fume and arsenic precipitation technology, applied in the metallurgical field, can solve the problems of untreated sodium arsenate, low recovery rate of valuable metals, unrecovered metals, etc. effect of the problem

Active Publication Date: 2017-11-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN105648226A and CN105648227A disclose the method for realizing the separation of arsenic and antimony by oxygen pressure alkali leaching. The separation of arsenic and antimony is relatively thorough, but the sodium arsenate obtained in the process has not been treated, and valuable metals such as tellurium and antimony have not been recovered
[0004] To sum up, there are many research papers and related patent reports on removing arsenic from dust and extracting valuable metals, but the existing technology still has low comprehensive recovery rate of valuable metals, limited market for arsenic products, and potential safety hazards. question

Method used

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  • A method for comprehensive utilization of arsenic-containing smoke and dust and harmless disposal of arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 1.57%, As 48.56%, Sn 0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%, and the following steps are used deal with:

[0062] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor, the control conditions are liquid-solid volume mass ratio 10:1, stirring speed 300r / min, leaching temperature 160°C, oxygen partial pressure 2Mpa, The leaching time is 2 hours. After the leaching is completed, the slurry is removed and separated by filtration to obtain the leaching solution and leaching residue;

[0063] After testing: the leaching rate of arsenic is 68.64%, the concentration of each element in the leach solution is 709.60ppm Pb, 31.02ppm Se, 1.26g / L Sb, 123.28ppm Te, and 33.33g / L As.

[0064] (2) Regulate growth method to fix arsenic: adjust the pH value of the leachate obtained in step (1) to 2...

Embodiment 2

[0071] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 6.88%, As 36.51%, Sn 1.11%, Sb 29.77%, Zn 0.54%, Te 0.24%, Se 0.05%, and the following steps are used deal with:

[0072] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor, the control conditions are liquid-solid volume mass ratio 20:1, stirring speed 300r / min, leaching temperature 160°C, oxygen partial pressure 0.5Mpa , the leaching time is 2h, after the leaching is completed, the slurry is removed and separated by filtration to obtain the leaching solution and leaching residue;

[0073] After testing: the arsenic leaching rate is 72.68%, and the concentration of each element in the leach solution is 515.20ppm Pb, 31.56ppm Se, 0.88g / L Sb, 122.26ppm Te, and 13.27g / L As.

[0074] (2) Distributed crystallization method for arsenic fixation: adjust the initial pH value of the leaching ...

Embodiment 3

[0081] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 5.46%, As 30.29%, Sn 0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07%, and the following steps are used deal with:

[0082] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fume in the reaction kettle, the control conditions are liquid-solid volume mass ratio 10:1, stirring speed 300r / min, leaching temperature 200℃, oxygen partial pressure 2.5Mpa , the leaching time is 4h, after the leaching is finished, remove the slurry, filter and separate, and obtain the leaching solution and leaching residue;

[0083] After testing: the arsenic leaching rate is 62.75%, and the concentration of each element in the leach solution is Pb 956.35ppm, Se 18.91ppm, Sb 0.93g / L, Te 144.92ppm, As 19.01g / L.

[0084] (2) Fixing arsenic in the leach solution: using the lime arsenic precipitation method, adjust the pH value of the l...

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Abstract

The invention provides a method for the comprehensive utilization of arsenic-containing smoke and the harmless treatment of arsenic. The method adopts the operation of carrying out oxygen pressure water leaching, solidifying arsenic in leachate, washing leaching residues and recycling valuable metals from the washed residues. Soluble arsenic is removed from the smoke through oxygen pressure water leaching. The arsenic in the leachate is synthesized into stable solid arsenic minerals by combining one or more than two of a controlled growth process, a distribution and crystallization process, a lime arsenic precipitation process and a precipitation and converting process. Then, the solid arsenic minerals are solidified by adopting a stacking or cementation manner, and all valuable elements in the leaching residues are recycled and utilized to an utmost extent through the procedures of washing, reduction smelting, oxidization blowing and the like. According to the method, the arsenic is removed from the smoke, stibium, lead, bismuth and the like are kept in the residues from which the arsenic is removed as much as possible, and the harmless separation of the arsenic from the valuable metals is realized. The comprehensive utilizing rate of the resources is high, the application range of the raw materials is wide, and a pollution problem in the extracting process of a traditional technology is solved. The method has more remarkable advantages over smoke produced in lead and zinc smelting processes.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for comprehensive utilization of arsenic-containing smoke and dust and harmless disposal of arsenic. Background technique [0002] In nature, arsenic is usually known as arsenopyrite (FeAsS), arsenopyrhotite (FeAsS 2 ), Arsenite (FeAs 2 ), arsenite (Cu 3 AsS 3 ), realgar (As 2 S 3 ), orpiment (As 2 S 3 ) and other minerals, which are enriched in non-ferrous metal ores such as copper, lead, zinc, nickel, cobalt, gold and silver; in the process of non-ferrous metallurgy, many high-arsenic solid materials are produced, such as roasting and smelting smoke. These materials contain arsenic as high as 5-50%, and also contain a large amount of valuable metals, which are directly returned to the smelting process, resulting in the accumulation of arsenic in the system. Therefore, arsenic removal should usually be treated separately. Arsenic is a highly toxic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B13/00C22B30/04C22B30/02
CPCC22B7/006C22B7/02C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏张建鑫李启厚李玉虎周亚明
Owner CENT SOUTH UNIV
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