Method for extracting vanadic anhydride from stone coal

Abstract

The invention relates to a method for extracting vanadic oxide from stone coal, which comprises the process flow in sequence as follows: mixing and fine grinding, limestone mine is added into stone coal vanadium ore for carrying out mixing and fine grinding; pellet making; roasting; grinding of pellets; lixiviation, water and vitriol are added for carrying out lixiviation at normal temperature; filtration, leached slag and leached liquid are filtered; washing-pretreatment of the leached liquid; ion exchange; desorption; regulation of PH value; sedimentation, sedimentation is carried out to obtained ammonium meta-vanadate; washing for removing the ion of incidental elements absorbed on the surface of ammonium meta-vanadate precipitation; drying; roasting and obtaining the vanadic oxide products with the metallurgical purity of 98 to 99. The method is characterized by wide technical applicability, high comprehensive recovery ratio, low exhaust emission, low energy consumption, low production cost and high purity of products, and that waste water can be recycled, and so on.

Description

1. Technical field [0001] The invention relates to a method for extracting vanadium pentoxide from stone coal. 2. Background technology [0002] At present, most of the domestic stone coal vanadium mines use sodium salt roasting extraction method. The process flow is ore crushing, ball milling, ball making, sodium salt roasting, ore ball grinding, leaching with sulfuric acid at a temperature of 80-100 ° C, extraction and stripping , ammonia precipitation, ammonium metavanadate washing and dehydration, and roasting into vanadium pentoxide. The process has high labor intensity, high energy consumption, low comprehensive recovery rate, and produces Cl during roasting. 2 , HCl and other toxic gases, causing serious pollution. [0003] In order to eliminate serious exhaust gas pollution and increase the recovery rate, many domestic research institutes have carried out exploration and research in various ways in the past ten years. For example, the Chinese patent discloses "a l...

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Problems solved by technology

For example, the Chinese patent discloses "a low-salt calcium-doped roasting-normal temperature low-acid leaching-extraction vanadium extraction process researched by Dongping Vanadium Smelter in Anhua County, Hunan Province, patent number: 96118450.7". Great improvements have been made, which can reduce environmental pollution and reduce production costs, but sodium chloride still needs to be added, and the discharge of waste gas and waste water is still relatively large, which has not fundamentally solved the problems of environmental pollution and production cost reduction

[0004] In order to solve the above-mentioned problems, the Chinese patent discloses the "stone coal composite calcification roasting-low acid leaching-special ion exchange vanadium production method" researched by Dai Xubin and Cheng Tianrong, patent application number 200410061233.9, which is to add calcium-containing double fly powder, which can reduce exhaust emissions, but there are several deficiencies in this process: first, the conversion accelerator sodium nitrite must be added at the same time as the calcium-containing double fly powder, which increases the process cost, and nitrogen oxides will be produced during roasting, causing Environmental pollution; the 2nd, this process is to roast in open hearth, and roasting efficiency is low, causes the comprehensive recovery rate of vanadium pentoxide not high; It occupies a lot of land, the leaching rate of vanadium pentoxide is not high, the leaching residue is easy to compact and difficult to dig out from the soaking tank, and consumes a lot of energy

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