Method for pre-removing arsenic in arsenic-containing soot

A soot and pre-removal technology, applied in the direction of improving process efficiency, etc., can solve the problems of high cost and incomplete arsenic removal of arsenic-containing soot, and achieve the effects of reducing leaching rate, realizing separation and recovery, and reducing alkali consumption

Active Publication Date: 2017-05-10
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide an efficient, environmentally friendly and economical arsenic-contain

Method used

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  • Method for pre-removing arsenic in arsenic-containing soot

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Embodiment 1

[0023] Get 100Kg copper smelting soot (specific composition is As: 18.14%, Zn: 9.61%, Sn: 1.49%, Pb: 15.08%, Cu: 4.07%, Bi: 7.00%, In: 0.11%; Arsenic phase: arsenic oxide : 12.73%, arsenate: 4.96%, arsenic sulfide: 0.11%, arsenopyrite: 0.36%) for hydrothermal leaching, leaching process control temperature 85 ℃, liquid-solid ratio 8:1, reaction time 20min, stirring speed 200rpm, After the reaction is over, the liquid-solid separation is carried out while it is hot, the leaching rate of arsenic reaches 75.68%, the concentrated crystallization precipitates arsenic oxide, the arsenic precipitation rate is 92.37%, and the crystallization mother liquor returns to the water immersion process. The water leaching residue is further subjected to alkaline leaching. During the leaching process, the concentration of sodium hydroxide is controlled at 1.5mol / L, the temperature is 90°C, the liquid-solid ratio is 5:1, the reaction time is 1h, and the stirring speed is 200rpm. After the reaction...

Embodiment 2

[0025] Get 100Kg lead smelting soot (specific composition is As: 48.50%, Sb: 12.1%, Fe: 1.24%, Pb: 8.45%, Bi: 0.513%, In: 0.24%; Arsenic phase: arsenic oxide: 39.41%, arsenic salt: 4.67%, elemental arsenic: 1.56%, others: 2.87%) for hydrothermal leaching, the leaching process is controlled at a temperature of 95°C, a liquid-solid ratio of 8:1, a reaction time of 30min, and a stirring speed of 200rpm. The liquid-solid separation is carried out, the leaching rate of arsenic reaches 80.62%, the concentration and crystallization precipitates arsenic oxide, the arsenic precipitation rate is 91.05%, and the crystallization mother liquor returns to the water immersion process. The water leaching residue is further subjected to alkaline leaching. During the leaching process, the concentration of sodium hydroxide is 2mol / L, the temperature is 90°C, the liquid-solid ratio is 6:1, the reaction time is 1h, and the stirring speed is 250rpm. After the reaction is completed, the liquid-solid ...

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Abstract

The invention discloses a method for pre-removing arsenic in arsenic-containing soot. The method is characterized in that the arsenic-containing soot is taken as a raw material; the arsenic is pre-removed by adopting a two-stage leaching process, wherein the first stage is hot water leaching; the second stage is alkaline leaching; leachates at the two stages are respectively cooled and crystallized to obtain arsenic-containing crystal; the total removal rate of the arsenic in the whole process is 98 percent or higher, so that the removal of the arsenic at a source is realized to avoid the enrichment and the pollution of the arsenic; meanwhile, coppers, leads and other valuable metals are enriched in leaching residues so as to be further recovered through a wet process. Therefore, the double purposes of economy and environmental protection are realized.

Description

technical field [0001] The invention relates to a method for removing arsenic from arsenic-containing soot, in particular to a method for removing arsenic from arsenic-containing soot containing complex systems such as arsenic element, arsenic oxide, arsenic sulfide and arsenate, belonging to the technical field of hydrometallurgy . Background technique [0002] Arsenic-containing soot mainly comes from two aspects: on the one hand, it comes from the roasting and smelting process of metal minerals such as copper, lead, and zinc. Since most of the arsenic is associated with these metals, arsenic cannot be completely suppressed during the beneficiation process. Therefore, there will be a certain amount of arsenic. Arsenic enters the smelting process together with the valuable metals, and then enters the dust and smelting slag respectively; on the other hand, it comes from the arsenic-containing soot produced when the arsenic-containing non-ferrous metal smelting slag and waste...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/04C22B25/06C22B19/30C22B19/20C22B13/00C22B15/00C22B30/02C22B30/06
CPCC22B7/006C22B7/008C22B7/02C22B13/045C22B15/0065C22B15/0082C22B19/24C22B19/30C22B25/04C22B25/06C22B30/02C22B30/04C22B30/06Y02P10/20
Inventor 刘维梁超焦芬杨康覃文庆蔡练兵
Owner CENT SOUTH UNIV
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