Method for extracting vanadic anhydride from stone coal vanadium ore

Abstract

The invention relates to a method for extracting V2O5 from stone coal vanadium ores, which is characterized in that the stone coal vanadium ores are grinded, subjected to high-temperature roasting, and directly leached out by a dilute sulfuric acid; slag is washed and filtered by water; and a leached solution is extracted by extract containing an N235 extractant, and subjected to back-extraction,ammonium metavanadate precipitation, filtration, washing, deamination and roasting to obtain the V2O5. The method greatly reduces pollution of waste gas and waste water. Compared with the prior salt roasting (sodium modification) technology, the technology has a reasonable design structure, high comprehensive utilization rate of resources, proper material consumption, strong controlled ability ofthe process, high product quality and high automation degree of the technological flow, and is convenient for large-scale industrial production. The technology does not have exact demands on the raw ores and has good adaptability. The overall yield of the technology is high, reaches more than 85 percent, is on the advanced level in China currently, and is improved by approximately 25 percent compared with the overall yield of sodium modification roasting technology of other vanadium smelting plants in Hunan province.

Description

technical field [0001] The invention relates to a method for extracting vanadium pentoxide from stone coal vanadium ore. Background technique [0002] At present, most of the vanadium extraction from stone coal in China adopts salt roasting, P 204 Extraction process, the process flow is ore crushing, ball milling, decarburization and oxidation by adding salt, roasting at a temperature of 800-900°C, crushing of ore balls, leaching with sulfuric acid at a temperature of 80-100°C, P 204 Extraction and stripping, ammonia precipitation, ammonium metavanadate washing and dehydration, burning into vanadium pentoxide (V 2 o 5 ). The process has high labor intensity, high energy consumption, low comprehensive recovery rate and serious pollution of three wastes. In order to eliminate serious waste gas pollution and improve the recovery rate, many domestic research institutes have carried out exploration and research in various ways in the past ten years. For example, although the ...

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Problems solved by technology

Although this method has no strict requirements on the ore, adding sodium salt will produce a large amount of HCl and Cl when the ore is roasted. 2 Waste gas such as waste gas and Na-containing wastewater cause serious pollution of surrounding air and water bodies, so large-scale production cannot be carried out

From a foreign point of view, the United States has the technology of extracting vanadium from carbonaceous shale through international online search, but most of them are sodium roasting, but the method of extracting vanadium from carbonaceous vanadium ore (solvent-free synthetic resin water Dispersion liquid, patent No. 4115110), adopts rotary pure oxygen roasting, equipment investment is large, process requirements are high, and it is not suitable for my country

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