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A method for removing arsenic from arsenic-containing smoke and its solidification

A technology of arsenic fume and arsenic removal, which is applied in the field of metallurgy to achieve the effect of changing the feeding method, high comprehensive utilization rate of resources, and wide range of raw material adaptability

Active Publication Date: 2018-09-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can realize arsenic removal from arsenic dust and comprehensive recycling of valuable elements

Method used

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  • A method for removing arsenic from arsenic-containing smoke and its solidification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, it includes the following main components in terms of mass percentage: Pb 5.26%, As 39.65%, Sn 0.5%, Sb 29.36%, Zn 0.12%, Se 0.04%.

[0057] Weigh a certain mass of the high arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio of 10:1 (ml:g), the stirring speed is 700r / min, the NaOH concentration is 1mol / L, the leaching temperature is 80°C, and the leaching time is 2h. conditions for leaching experiments. After leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 72.36%, and the concentrations of elements in the leach solution were Pb 86.00ppm, Se 1.80ppm, Zn 20ppm, Sb 1.36g / L, and As 28.69g / L.

[0058] The leaching solution adopts the method of catalytic oxidation to decompose As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 5L / min, the As / Mn molar ra...

Embodiment 2

[0063] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, it includes the following main components in terms of mass percentage: Pb 10.39%, As 34.59%, Sn 1.45%, Sb 20.54%, Zn 0.11%, Se 0.24%.

[0064] Weigh a certain mass of the high arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio of 10:1 (ml:g), the stirring speed is 700r / min, the NaOH concentration is 3mol / L, the leaching temperature is 50°C, and the leaching time is 4h. conditions for leaching experiments. After leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 52.06%, and the concentration of elements in the leaching solution were Pb 87ppm, Se 0.52ppm, Zn 71ppm, Sb 1.24g / L, and As 18.01g / L.

[0065] The leaching solution adopts the method of catalytic oxidation to decompose As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 10L / min, the As / Mn molar ...

Embodiment 3

[0070] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, it includes the following main components in terms of mass percentage: Pb 19.57%, As 24.26%, Sn 1.47%, Sb 30.45%, Zn 0.16%, Se 0.21%.

[0071] Weigh a certain mass of the high arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio 5:1 (ml:g), stirring speed 1000r / min, NaOH concentration 1mol / L, leaching temperature 30 ℃, leaching time 2h conditions for leaching experiments. After leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 42.26%, and the concentrations of elements in the leach solution were Pb 124ppm, Se 0.67ppm, Zn 107ppm, Sb 2.02g / L, and As 10.25g / L.

[0072] The leaching solution adopts the method of catalytic oxidation to decompose 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 ...

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Abstract

The invention relates to a method for removing arsenic from smoke containing arsenic and solidifying arsenic. The method comprises the following steps that production of comprehensive recovering of valuable metal such as arsenic, antimony, lead and bismuth from smelting smoke containing arsenic, antimony and lead is conducted, and arsenic accumulation in a system is reduced to enable arsenic to be harmless. According to the method provided by the invention, through normal-pressure alkaline leaching, soluble arsenic in the smoke is removed, after trivalent arsenic in a leaching agent is changed to pentavalent arsenic through catalytic oxidation, a stable solid arsenic mineral is compounded through a lime arsenic precipitation method, and then the solid arsenic mineral is solidified through a cement solidifying mode; and leaching slag is subjected to the processes such as washing, reduction smelting and oxidizing blowing, and then all valuable elements are recycled to the maximum. According to the method, by removing arsenic from smoke and leaving antimony, lead, bismuth and the like in the arsenic removed slag as far as possible, separation of arsenic and the valuable metal and harmlessness can be achieved; the comprehensive using rate of the resources is high, the application range of raw materials is wide, the pollution problem in the extracting process of a traditional technique is solved, and particularly dust generated in the lead-zinc smelting process is avoided, and the advantage of the method is more obvious.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for removing arsenic from arsenic-containing fume and solidifying it. 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 and carcinogenic element, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04C22B30/02C22B13/00C22B13/02
CPCC22B7/008C22B7/02C22B13/025C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎姚伟蒋涛李思唯
Owner CENT SOUTH UNIV
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