Method for leaching vanadium from stone coal containing vanadium

Abstract

The invention particularly relates to a method for leaching vanadium from stone coal containing vanadium. According to the technical scheme, the method comprises the steps of firstly, smashing the stone coal containing the vanadium, then conducting ore grinding on the stone coal containing the vanadium until the grain size which is smaller than 0.074mm accounts for 65-85wt%, and preparing the pulverized stone coal containing the vanadium; then, stirring a leaching agent and the pulverized stone coal containing the vanadium for leaching for 1-4 hours at 80-100 DEG C according to the liquid-solid mass ratio of (2.5-5):1, conducting first-stage solid-liquid separation, and obtaining a first-stage leachate for conducting subsequent purification enrichment work, and first-stage leaching residues for a second-stage acid leaching process; then, preparing a H2SO4 solution with the 10-25% volume concentration into a stirring leaching tank, adding CaF2 accounting for 1-7wt% of the first-stage leaching residues according to the liquid-solid mass ratio of (0.8-2):1, conducting stirring and leaching for 4-8 hours at the 80-100 DEG C, conducting second-stage solid-liquid separation, and obtaining a second-stage leachate used as the leaching agent of first-stage acid leaching, the second-stage leachate for circulation use, and two-stage leaching residues used as the final tail residues. The method has the advantages of being low in acid consumption, simple in process and strong in continuous productbility.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically relates to a method for leaching vanadium from vanadium-containing stone coal. Background technique [0002] At present, due to the lack of in-depth analysis of the properties of stone coal raw ore in domestic and foreign stone coal vanadium extraction processes, there are various defects in the process. For example, Zhang X.Y. et al. (Zhang Xiaoyun, Yang Kang, Tian Xueda, Qin Wenqing. Fluorosilicic acid leaching vanadium from carbonaceous shale [J]. International Mineral Processing, 2011, 100: 184-187.) analyzed the raw ore of vanadium-bearing stone coal in Hunan Province ( V 2 o 5 : 1.29wt%, Fe 2 o 3 : 4.73wt%, CaO: 2.52wt%) for treatment, specifically using H with a volume concentration of 30% 2 SO 4 , 95°C, and a liquid-solid ratio of 1mL / g for 24 hours, not only reduces the vanadium leaching rate, the vanadium leaching rate is only 51%, and con...

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Problems solved by technology

[0003] Zhang X.Y et al. 184-187.), continue to use 15% volume concentration of H2SO4 and 8% H2SiF6 , 95°C, and a liquid-solid ratio of 1mL / g, the vanadium-containing stone coal raw ore in Hunan Province was leached for 16 hours. Although fluoride was added as a leaching aid, the vanadium leaching rate could be increased to 80%, but it consumed a large amount of Acid, requires longer reaction time

[0004]Hu Jianfeng et al. The research shows that in the extraction of vanadium from stone coal, the pH of the leachate needs to be adjusted to 1.0~2.0 in advance to meet the requirements of subsequent extraction operations, which makes it necessary to increase the pretreatment of the leachate for the acid leaching leachate obtained by the ordinary vanadium extraction process from stone coal. , thus complicating the process of vanadium extraction from stone coal

[0005] Li Minting et al. (Li Minting, Li Cunxiong, Deng Zhigan, Wu Huiling, Liang Yanhui, Wei Chang. Recovery of vanadium in black shale by pressurized acid leaching[J] . Chinese Journal of Nonferrous Metals, 2008, 18(S1): 74-79.) Analysis of vanadium-bearing stone coal ore in Guizhou Province (V2O5: 3.28wt%, Fe2O3: 3.59wt%, CaO: 0.69wt%) were used for research, using pressure two-stage open-circuit leaching, one-stage leaching conditions: volume concentration of 25% H2SO4, 150°C, liquid-solid ratio 1.2mL / g, leaching for 3h; second-stage leaching conditions: volume concentration of 35% H 2SO4, 150°C, liquid-solid ratio of 1.2mL / g, leaching for 4 hours can achieve a relatively ideal leaching rate, but the acid consumption is large and the leaching temperature is high , the equipment requirements are harsh, and additional reagents are still added in the first stage of the leaching process, and a large amount of acid remaining in the second stage acid leaching solution is not effectively utilized. The second stage leaching process also needs three stages of water washing, which makes the process complicated and consumes a lot of acid

[0006] To sum up, although the existing stone coal vanadium extraction process has its own advantages, there are mainly disadvantages such as large acid consumption and complicated process

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