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

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,...

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.