Method for extracting vanadium from stone coal containing vanadium

Abstract

The invention specifically relates to a method for extracting vanadium from vanadium-containing stone coal. The technical plan is: first crush the vanadium-containing stone coal to a particle size of <3mm, raise the temperature to 700~900°C, roast at a constant temperature for 1~2 hours, cool and grind to obtain vanadium-containing stone coal powder; Stirring and leaching with the vanadium-containing stone coal at a liquid-solid mass ratio of (2.5~5)︰1 at 80~100°C for 1~4h, performing a stage of solid-liquid separation, and the obtained stage leaching solution is used for subsequent purification and enrichment operations , the first-stage leaching residue is used in the second-stage acid leaching process; then prepare H2SO4 with a volume concentration of 10-25% in the stirring leaching tank, and add 1-7wt of the first-stage leaching residue according to the liquid-solid mass ratio (0.8~2)︰1 % CaF2, stirring and leaching at 80-100°C for 4-8 hours, and the second-stage solid-liquid separation, the obtained second-stage leachate is the leaching agent for the first-stage acid leaching, and the second-stage leaching residue is the final tailings. The invention has the advantages of high vanadium leaching rate, low acid consumption, simple process for extracting vanadium from stone coal and strong continuous productivity.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically relates to a method for extracting 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. He Dongsheng et al. (He Dongsheng, Xu Xiongyi, Chi Ruan, Wei Dangsheng, Zhang Limin, Luo Ren, Wei Zuhua. Experimental study on direct acid leaching of stone coal[J]. Inorganic Salt Industry, 2012, 44(8): 22- 24.) For raw ore of vanadium-bearing stone coal in Hunan Province (V 2 o 5 : 1.00%, Fe 2 o 3 : 4.24%, CaO: 2.07%, MgO: 0.58%) using direct acid leaching vanadium extraction process, in the volume concentration of 19% H 2 SO 4 , 90°C, and a liquid-solid ratio of 4mL / g for 6h, because CaO, Fe 2 o 3 Pretreatment with acid-consuming substances s...

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Problems solved by technology

[0004]Brother Li Cun and others (Brother Li Cun, Wei Chang, Deng Zhigan, Li Minting, Li Xingbin, Fan Gang. Recovery of vanadium from black shale. Nonferrous Metals Society of China , 2010, 20(S1):127-131) showed that in vanadium extraction from stone coal, the pH of the leaching solution needs to be raised to 2.0 in advance to meet the requirements of subsequent extraction operations, which makes the The acid leaching leach solution needs to increase the pretreatment of the leach solution, which complicates the vanadium extraction process 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 leached in two stages under pressure, one stage leaching conditions: H2SO4, 150°C, liquid-solid ratio of 1.2mL / g, leaching for 3h; second-stage leaching conditions: volume concentration of 35% H2SO4, 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, which is harmful to the equipment. The requirements are strict, and additional reagents are still added in the first stage of leaching, and the large amount of residual acid in the second stage 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 technologies for extracting vanadium from stone coal have their own advantages, there are still problems such as low vanadium leaching rate, large acid consumption and complicated process. shortcoming

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