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Treatment method for vitrifying arsenic-alkali residue

A technology of glass solidification and treatment method, applied in the direction of process efficiency improvement, recycling technology, etc., can solve the problems of sodium arsenate product backlog, restricting process use, harsh operating environment, etc.

Inactive Publication Date: 2013-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This kind of process needs to dissolve arsenic-alkali slag in a large amount of water. The precipitation method will produce a large volume of arsenic-containing waste liquid. Direct discharge will bring huge pollution to the environment. Advanced treatment is required to meet the discharge standard. The treatment cost is high and restricts The use of this type of process
The method of direct crystallization of sodium arsenate and soda ash needs to evaporate a large volume of arsenic-containing liquid, and the arsenic will be splashed out during the evaporation process, and the operating environment is harsh; the high toxicity of the sodium arsenate produced by crystallization also seriously limits the The use of sodium in various industries, a large number of sodium arsenate products are backlogged due to the lack of market sales channels, and the potential environmental risks are huge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take composition (mass percentage content): As: 18%, Sb: 22%, Na: 28% arsenic-alkali slag 200g, mix into the pulverized coal 15g that carbon content is 78%, namely 1.8 of the theoretical carbon requirement times, and reduced at 1200°C, 44.5g of crude antimony was obtained, containing 96.1% of Sb and 2.7% of As in the crude antimony, and the recovery rate of antimony was 97.2%; 2 , Fe 2 o 3 , CaO and Al 2 o 3 , and melted at 1100°C to form the substance contents: As 2 o 3 17%, SiO 2 23%, Na 2 O32%, Fe 2 o 3 22%, CaO4%, Al 2 o 32% glass liquid, the glass liquid was directly quenched with water to obtain 203g cullet, and the leaching toxicity test was performed on the cullet, and the content of As in the leaching solution was 1.27mg / L, which did not reach the standard value of hazardous waste, and it was general solid waste .

Embodiment 2

[0042] Take 500g of arsenic-alkali slag whose composition (mass percentage) is As: 22%, Sb: 35%, and Na: 28%, and add 36g of coke powder with a carbon content of 87%, which is 1.2 times the theoretical carbon requirement , reduced at 900°C to obtain 174.8g of crude antimony, containing 98.3% of Sb and 0.72% of As in the crude antimony, and the recovery rate of antimony was 98.2%; 2 , Fe 2 o 3 , CaO and Al 2 o 3 , and melted at 1250°C to form the substance contents: As 2 o 3 27%, SiO 2 21%, Na 2 O22%, Fe 2 o 3 22%, CaO6%, Al 2 o 3 2% molten glass, pour the molten glass into a steel mold and cast an ingot to obtain a 407g heavy glass ingot. After the glass ingot is broken, the leaching toxicity test is carried out, and the content of As in the obtained leachate is 0.77mg / L, which does not reach the level of hazardous waste The standard value is general solid waste.

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Abstract

The invention discloses a treatment method for vitrifying arsenic-alkali residue, aiming at solving the problem of pollution or potential menace of the existing arsenic-alkali residue treatment process on environment. The treatment method for vitrifying the arsenic-alkali residue comprises the following steps of: selectively reducing sodium antimonate in the arsenic-alkali residue to metallic antimony by a carbon reducing agent in a molten state and keeping arsenic in the residue in the form of sodium arsenate; and then adding a glass molten solvent in the arsenic-containing residue to form a low-temperature glass phase, discharging the glass phase, and then carrying out water-quenching on the glass phase into broken glass pieces or directly casting the glass phase into a glass ingot in an ingot casting mould, thus facilitating piling up or returning to a pit and land-filling. According to the invention, the recovery rate of antimony in the arsenic-alkali residue is greater than 95%, and the content of arsenic in the metallic antimony is less than 3%; and the arsenic-containing glass pieces belong to general solid wastes and can be directly piled up in the open air or land-filled.

Description

technical field [0001] The invention relates to a treatment method for the highly toxic arsenic-alkali slag produced in the antimony smelting process, in particular to a treatment method for vitrification and cleaning of the arsenic-alkali slag. technical background [0002] Arsenic-alkali slag is a kind of highly toxic smelting waste containing sodium arsenate, sodium antimonate and sodium carbonate produced during the antimony refining process. Since sodium arsenate is easy to dissolve and pollute the environment, it is necessary to build a special slag shed to remove it. Even so, arsenic leakage incidents in arsenic-alkali slag also occur frequently, and the pollution of arsenic-alkali slag has become a bottleneck factor restricting the development of the antimony smelting industry. [0003] The existing processing method of arsenic-alkali slag mainly utilizes the property that sodium arsenate and sodium arsenite in arsenic-alkali slag are soluble in water, but sodium ant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B30/02C21B3/06
CPCY02P10/20Y02W30/50
Inventor 刘维覃文庆刘三军蔡练兵杨康
Owner CENT SOUTH UNIV
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