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A method for recovering valuable metals from arsenic-containing dust and synthesizing arsenic-fixed minerals by precipitation transformation

A technology for precipitation transformation and valuable metals, applied in the field of metallurgy, can solve the problems of low comprehensive recovery rate of valuable elements, limited arsenic product market, untreated sodium arsenate, etc., to achieve resource utilization and harmlessness, and raw material adaptation Wide range of effects with low arsenic content

Active Publication Date: 2019-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN105648226A and CN105648227A disclose a 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] There are many research papers and related patent reports on removing arsenic from soot and extracting valuable metals, but the comprehensive recovery rate of valuable elements is low, the market for arsenic products is limited, and there are potential safety hazards

Method used

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  • A method for recovering valuable metals from arsenic-containing dust and synthesizing arsenic-fixed minerals by precipitation transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Taking arsenic-containing soot from a domestic lead-zinc smelter as an example, the main components of the raw materials are Pb10.13%, As30.11%, Sn0.5%, Sb30.02%, Zn0.07%, Se0.08%.

[0044] Proceed as follows:

[0045] (1) Weigh a certain amount of high-arsenic and antimony fumes in the reactor, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 10:1, the stirring speed of 700r / min, the leaching temperature of 80°C, and the leaching time of 2h. After leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 51.25%. The concentration of each element in the leach solution was Pb 75.00ppm, Se 0.52ppm, Zn 48ppm, Sb 0.66g / L, and As15.43g / L.

[0046] (2) The leaching liquid adopts the method of catalytic oxidation to convert As 3+ Oxidized to As 5+ , the control conditions are that the oxygen flow rate is 5L / min, the As / Mn molar ratio is controlled at 10:1, and the temperature of the catalytic oxidat...

Embodiment 2

[0051] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb8.64%, As25.63%, Sn0.58%, Sb24.56%, Zn0.09%, Se0.10%.

[0052] Proceed as follows:

[0053] (1) Weigh a certain amount of high-arsenic-antimony fumes in the reaction kettle, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 5:1, the stirring speed of 300r / min, the leaching temperature of 60°C, and the leaching time of 2h. After leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 46.25%. The element concentrations in the leach solution were Pb 69ppm, Se 0.73ppm, Zn 50ppm, Sb 0.67g / L, and As11.85g / L.

[0054] (2) The leaching liquid adopts the method of catalytic oxidation to convert As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 10L / min, the As / Mn molar ratio is controlled at 40:1, and the temperature of the catalytic oxid...

Embodiment 3

[0059] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb13.24%, As29.31%, Sn0.9%, Sb27.68%, Zn0.04%, Se0.11%.

[0060] Proceed as follows:

[0061] (1) Weigh a certain amount of high-arsenic-antimony fumes into the reactor, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 15:1, stirring speed of 50r / min, leaching temperature of 40°C, and leaching time of 3h. After leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 42.35%. The concentration of each element in the leach solution was Pb 113ppm, Se 0.50ppm, Zn 92ppm, Sb 1.37g / L, and As12.41g / L.

[0062] (2) The leaching liquid adopts the method of catalytic oxidation to convert As 3+ Oxidized to As 5+, the control conditions are as follows: the oxygen flow rate is 1L / min, the As / Mn molar ratio is controlled at 20:1, and the temperature of the catalytic oxidation system ...

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Abstract

The invention relates to a method for recycling valuable metals from arsenic-contained smoke dust and synthesizing a solid arsenic mineral through a precipitation transformation method. The method comprises the following steps of water leaching at the normal pressure, leaching liquid catalytic oxidizing, oxidized liquid arsenic solidifying, leaching residue cleaning and residue cleaning to recycle the valuable metals. According to the method, by water leaching at the normal pressure, soluble arsenic in the smoke dust is removed; leaching liquid is subjected to a catalytic oxidizing process, As3+ is oxidized to be As5+; oxidized liquid is subjected to an arsenic precipitating process and a precipitation transformation process to synthesize the high-stability solid arsenic mineral; and leaching residues is subjected to the processes of cleaning, reducing, smelting, oxidizing-blowing and the like, so that all valuable elements are recycled. The arsenic is removed from the smoke dust and solidified, antimony, lead, bismuth and the like remain in the leaching residues as far as possible, and the arsenic and the valuable metals are separated, and harmlessness is achieved. The resource comprehensive utilization rate is high, the applicable range of raw materials is wide, and the pollution problem of a traditional technology in the extraction process is solved; and the advantages of the method are more obvious especially for smoke dust generated in the lead and zinc smelting progress.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for comprehensively recovering valuable metals from arsenic-containing fumes 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 hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04C22B30/02C22B13/02
CPCC22B7/006C22B7/02C22B13/025C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎张建鑫马欢李思唯
Owner CENT SOUTH UNIV
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