Method for comprehensively reclaiming arsenic caustic dross and sulfur dioxide flue gas in antimony pyrometallurgical smelting

A technology for recovering sulfur dioxide and arsenic, which is applied in the direction of chemical instruments and methods, separation methods, and improvement of process efficiency. It can solve problems such as pollution, low desulfurization efficiency, and high cost of anhydrous sodium arsenate, and achieve simple process flow and low equipment investment. Less, significant economic and environmental benefits

Active Publication Date: 2010-12-01
锡矿山闪星锑业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses more ammonium sulfate or sulfuric acid or hydrochloric acid, and the sodium arsenate solution is dried into anhydrous sodium arsenate, which is costly and inconvenient to operate, and does not fully utilize the flue gas sulfur dioxide produced in the antimony refining process.
[0004] In addition, the waste gas produced in the process of antimony metallurgy not only contains sulfur dioxide concentration of only 0.6-1.0%, which is far lower than the economic utilization concentration of sulfur dioxide, but also contains low concentration and ultrafine antimony-containing dust, and the concentration of antimony dust is only 10 mg / L~30mg / L, the particle size is less than 2 microns, it is difficult to capture economically by conventional technology
At present, no effective treatment technology has been found for the low-concentration sulfur dioxide flue gas in the antimony metallurgical process. Only a few large factories use lime desulfurization technology for desulfurization. The cost is 500 yuan), the antimony-containing dust in the exhaust gas cannot be comprehensively recycled, and the desulfurization residue can only be piled up and there is a problem of secondary pollution
The waste gas from other small enterprises is basically discharged directly. Sulfur dioxide gas and antimony-containing dust will cause huge pollution to surface soil and surface water, and will directly affect the safety of drinking water for people.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Water immersion: In a 500-liter stainless steel reaction tank, add 150kg of antimony smelting arsenic-alkali slag (containing 21.55% antimony, 6.06% arsenic, 60% sodium carbonate and sodium hydroxide) and 300 liters of water, and heat it with steam under stirring To 95°C, the reaction time is 40 minutes, the first filtration, and 100 liters of water is added to the filter residue, and the reaction is carried out at 90°C for 60 minutes, and the second filtration is carried out. The input and output conditions are as follows:

[0027] input:

[0028] The weight of arsenic-alkali slag is 150kg, and the grade is: Sb 21.55%, As 6.06%; (of which: Sb 100%, As 100%).

[0029] output:

[0030] (1) The dry weight of antimony slag is 77.88kg, the grade is: Sb 37.37%, As 0.85%; (the percentage of Sb and As is: Sb 90.03%, As 7.28%).

[0031] (2) 205L of primary leaching solution, the concentration is: Sb 11.79g / L, As 33.92g / L; (the percentage of Sb and As is: Sb 7.48%, As 76.50...

Embodiment 2

[0047] 1. Absorb sulfur dioxide

[0048] Take another 50L of leaching solution in a plastic stirring tank, and pass it into the flue gas of sulfur dioxide (including SO 2 Concentration: 16000~29000mg / m 3 , very little antimony content), after 13 hours, the pH value of the solution was 4.0 to 5.5, stop the ventilation, and filter after standing for 8 hours to obtain 1.10kg of dry antimony slag, the composition is: Sb 50.87%, As 0.15%; the solution becomes reduced Solution, its composition is: Sb 0.87g / L, As 33.88g / L; After the sulfur dioxide tail gas is absorbed by the leaching liquid water foam once, the content is 710mg / m 3 Direct emptying (the emptying standard is 800mg / m 3 ), the absorption rate of sulfur dioxide is 95.5%.

[0049] 2. Sulfurization and arsenic removal

[0050] At 20-40°C, make 8.00kg of sodium sulfide into a 16L solution and slowly add it into the reducing solution in 1 under stirring for 1.0 hour, control the pH value to 6.0-7.0, and filter after stand...

Embodiment 3

[0058] 1. Absorb sulfur dioxide

[0059] Take 50L of the primary leaching solution in a plastic stirring tank, and pass the sulfur dioxide flue gas in the process of antimony refining (including SO 2 Concentration: 16000~29000mg / m 3 , very little antimony content), after 18 hours, the pH value of the solution was 3.5 to 4.5, stop the aeration, and filter after standing still for 8 hours to obtain 0.52kg of dry antimony slag, the composition is: Sb 51.67%, As 0.60%; the solution becomes reduced The composition of the solution is: Sb 0.33g / L, As 10.38g / L; the sulfur dioxide tail gas is absorbed by the leaching liquid water foam once, and the content is 720mg / m 3 Direct emptying (the emptying standard is 800mg / m 3 ), the absorption rate of sulfur dioxide is 95%.

[0060] 2. Sulfurization and arsenic removal

[0061] At 20-40°C, make 2.6kg of sodium sulfide into a 6L solution, slowly add it to the reducing solution in 1 under stirring for 1.0 hour, control the pH value to 6.0-...

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Abstract

The invention discloses a method for comprehensively reclaiming arsenic caustic dross and sulfur dioxide flue gas in antimony pyrometallurgical smelting. The method comprises the following steps: arsenic containing caustic dross in the antimony smelting process is leached; waste gas sulfur dioxide in the antimony-containing alkaline solution is absorbed; vulcanizer is used for dearsenizing; ferric sulfate is used for further dearsenizing; and purification, concentration and drying are performed; and the like. Therefore, the hard treated arsenic caustic dross and low content sulfur dioxide of the waste gas, which are generated in the antimony smelting process, can be treated completely, wherein the antimony reclaiming rate reaches 99 percent, arsenic removal rate is over 90 percent, sulfur dioxide removal rate is over 95 percent through absorption, so that the gas reaches emission standard, and alkali is transformed into sodium sulfite. The method has the advantages of simple technical process, small equipment investment, remarkable economic benefit and environmental benefit, completely solves the arsenic caustic dross and waste gas sulfur dioxide in the antimony smelting process, and cleans the antimony smelting process. Water solution in the whole process is circulated in a closed loop without wastewater discharge, and the waste gas is qualified to be exhausted to air, so the method is a clean and environment-friendly process.

Description

technical field [0001] The invention relates to a method for comprehensively recovering arsenic-alkali slag and sulfur dioxide flue gas in antimony smelting by fire method. Background technique [0002] At present, more than 90% of antimony production processes at home and abroad adopt the pyrometallurgy process, and the pyrometallurgical smelting process is mainly based on the antimony concentrate blast furnace volatilization smelting-antimony reverberatory furnace reduction smelting and refining process. The antimony blast furnace is generally favored by antimony smelting enterprises because of its high hearth processing capacity, strong adaptability to raw materials, and high metal recovery rate. However, the antimony blast furnace produces antimony matte and the output rate of crude antimony is high (about 20-30%) , with high impurity content (about 15-30%), it can only be treated as a return product in the antimony blast furnace, which not only consumes a lot of energy,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B30/04C22B30/02B01D53/78B01D53/50
CPCY02P10/20
Inventor 单桃云刘鹊鸣谈应顺戴永俊李志强邓卫华姚兴娜曾雁
Owner 锡矿山闪星锑业有限责任公司
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