Method for comprehensively using arsenic-containing smoke dust and synthesizing solid arsenic minerals through precipitate conversion method

A technology for precipitation transformation and arsenic soot, applied in the field of metallurgy, can solve the problems of low recovery rate of valuable metals, limited market for arsenic products, untreated sodium arsenate, etc. low content effect

Active Publication Date: 2017-06-13
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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  • Method for comprehensively using arsenic-containing smoke dust and synthesizing solid arsenic minerals through precipitate conversion method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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 for processing :

[0045] (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, remove the slurry and filter and separate to obtain the leaching solution and leaching residue;

[0046] After testing: the leaching rate of arsenic is 64.53%, the concentration of each element in the leach solution is 709.60ppm Pb, 31.02ppm Se, 1.26g / L Sb, 123.28ppm Te, and 29.88g / L As.

[0047] (2) Fix arsenic in the leach solution: adjust the pH value of the leach solution to 1.5, add calcium oxide...

Embodiment 2

[0055] 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 for processing :

[0056] (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 finished, remove the slurry and filter and separate to obtain the leachate and leach residue;

[0057] After testing: the arsenic leaching rate is 51.29%, 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 9.36g / L As.

[0058] (2) Fixing arsenic in the leach solution: adjust the pH value of the leach solution to 2, add calcium oxide to the leach ...

Embodiment 3

[0066] 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%, Sn0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07%, and the following steps are used for processing :

[0067] (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;

[0068] After testing: the arsenic leaching rate is 64.52%, 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 19.54g / L.

[0069] (2) Fixing arsenic in the leach solution: adjust the pH value of the leach solution to 3, add calcium oxide to...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a method for comprehensively using arsenic-containing smoke dust and synthesizing solid arsenic minerals through a precipitate conversion method. The method comprises 5 steps of oxygen pressure water leaching, obtaining of solid arsenic in leach liquor, precipitate conversion, leaching residues washing and residue washing to recycling valuable metals: by the oxygen pressure water leaching, removing dissolvable arsenic from the smoke dust, synthesizing stable solid arsenic minerals through lime arsenic settling and precipitate conversion, curing the solid arsenic minerals by adopting a stockpiling mode, and carrying out procedures of washing, reducing smelting, oxidizing blowing and the like on leaching residues, so as to recycle and use all valuable elements to the maximum extent. According to the method, arsenic is removed from the smoke dust and synthesized into the stable solid arsenic minerals, and antimony, lead and bismuth are retained in arsenic-removed residues as much as possible, so that separation and harmlessness of the arsenic and the valuable metals can be realized. The method is high in comprehensive resource utilization rate and wide in raw material application range; the problem of pollution in an extraction process of a conventional technology is solved, and particularly soots produced in lead-zinc smelting process can be avoided. The method has a better advantage.

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 dust and synthesis of arsenic-fixed minerals by precipitation transformation. 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 sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B13/02C22B13/00C22B30/02C22B30/04A62D3/33A62D101/43
CPCA62D3/33A62D2101/43C22B7/001C22B7/006C22B7/02C22B13/025C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎张建鑫
Owner CENT SOUTH UNIV
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