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Method for extracting vanadium from vanadium titano-magnetite

A technology of vanadium-titanium-magnetite and ferrovanadium, which is applied in the direction of improving process efficiency, can solve the problems of low purity of vanadium pentoxide, low vanadium leaching rate, and high impurity content in leachate, so as to avoid multi-stage extraction and reverse reaction. The effect of extraction, impurity removal and enrichment operation, reduction of vanadium loss and waste water discharge, increase of reaction rate and vanadium leaching rate

Active Publication Date: 2015-10-21
HENAN POLYTECHNIC UNIV
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Problems solved by technology

The direct extraction process is to add sodium chloride to the vanadium-titanium magnetite, and then perform sodium roasting at above 1000°C after pelletizing, and then recover the vanadium in it by water leaching. This method causes serious air pollution and low recovery rate of vanadium (Hukkanen, E ., Walden, H. The production of vanadium and steel from titanomagnetites [J]. International Journal of Mineral Processing, 1985, 15: 89-102), can also use calcification roasting-acid leaching operation, this method uses a large amount of sulfuric acid and vanadium leaching Low yield (Li Lanjie, Zhang Zhang, Zheng Shili, Lou Taiping, Zhang Yi, Chen Donghui, Zhang Yan. Calcification roasting of vanadium-titanium magnetite and its acid leaching to extract vanadium[J]. Chinese Journal of Process Engineering, 2011, 11(4): 573- 578)
The vanadium slag extraction process is to sinter the vanadium-titanium magnetite and iron-smelt first. Vanadium mainly exists in the vanadium slag after iron-smelting. This part of vanadium can be extracted by direct acid leaching and calcification roasting-acid leaching (Deng Zhigan, Wei Chang, Li Xingbin, Xu Hongsheng, Li Minting, Li Cunxiong, Fan Gang. Leaching Vanadium from Vanadium Titanium Magnetite Tailing Slag[J]. Chinese Journal of Nonferrous Metals, 2012, 22(6): 1770-1777 ), and then remove impurities and enrich vanadium through a multi-stage extraction-back extraction process. The process operation is cumbersome, and it is prone to emulsification, resulting in loss of vanadium. There are many impurities in the vanadium-rich liquid, the product vanadium pentoxide has low purity, a large amount of acidic wastewater, and low pH value.
[0003]Therefore, the current method of extracting vanadium using vanadium-titanium magnetite has long process flow, serious air pollution, low vanadium recovery rate, high impurity content in leachate, and extraction process operation. Complexity, low purity of the product vanadium pentoxide and difficulty in the treatment of acidic wastewater generated during the process

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  • Method for extracting vanadium from vanadium titano-magnetite

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Embodiment 1

[0022] Discharge ferrovanadium concentrate, calcium fluoride and sulfuric acid solution into the acid leaching tank for stirring acid leaching; the mass percentage of calcium fluoride added is 12-15%, the sulfuric acid concentration is 3-4mol / L, liquid-solid The mass ratio is 2~4:1, the stirring intensity is 100~150r / min, and the leaching temperature is 100~120°C, stirring for 60~120min. The acid leaching residue and acid leaching solution are obtained by solid-liquid separation, and the leaching of vanadium is greater than 91%. Mix the pickling solution with 5% sodium chlorate and stir for 5-15 minutes, then adjust the pH value to 1.0-2.0 with sodium hydroxide solution and stir for 15-30 minutes to obtain vanadium-rich slag and Acidic waste liquid, the vanadium precipitation rate is greater than 99.5%, and the acidic waste liquid is returned to the acid leaching operation of vanadium iron concentrate. The vanadium-rich slag is oxidized and roasted, and the mass percentage of ...

Embodiment 2

[0024]Discharge ferrovanadium concentrate, calcium fluoride and sulfuric acid solution into the acid leaching tank for stirring acid leaching; the mass percentage of calcium fluoride added is 8~12%, the concentration of sulfuric acid is 2~3mol / L, liquid-solid The mass ratio is 2~4:1, the stirring intensity is 100~150r / min, and the leaching temperature is 100~120°C, stirring for 120~180min. The acid leaching residue and acid leaching solution are obtained by solid-liquid separation, and the leaching of vanadium is greater than 90%. Mix the pickling solution with 5% sodium chlorate and stir for 5-15 minutes, then adjust the pH value to 1.0-2.0 with sodium hydroxide solution and stir for 15-30 minutes to obtain vanadium-rich slag and Acidic waste liquid, the vanadium precipitation rate is greater than 99.8%, and the acidic waste liquid is returned to the acid leaching operation of vanadium iron concentrate. The vanadium-rich slag is oxidized and roasted, and the amount of sodium ...

Embodiment 3

[0026] Discharge ferrovanadium concentrate, calcium fluoride and sulfuric acid solution into the acid leaching tank for stirring acid leaching; the mass percentage of calcium fluoride added is 5-8%, the sulfuric acid concentration is 2-4mol / L, liquid-solid The mass ratio is 2~4:1, the stirring intensity is 100~150r / min, and the leaching temperature is 100~120°C, stirring for 120~180min. The acid leaching residue and acid leaching solution are obtained by solid-liquid separation, and the leaching of vanadium is greater than 89%. Mix the pickling solution with 5% sodium chlorate and stir for 5-15 minutes, then adjust the pH value to 1.0-2.0 with sodium hydroxide solution and stir for 15-30 minutes to obtain vanadium-rich slag and Acidic waste liquid, the vanadium precipitation rate is greater than 99.9%, and the acidic waste liquid is returned to the acid leaching operation of vanadium iron concentrate. The vanadium-rich slag is oxidized and roasted, and the amount of sodium car...

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Abstract

The invention relates to a method for extracting vanadium from vanadium titano-magnetite. The method comprises the following steps: carrying out crushing, ore grinding and dry weak magnetic separation pretreatment on crude vanadium titano-magnetite to obtain vanadium-iron concentrate and mine tailings; mixing the vanadium-iron concentrate with calcium fluoride and a sulfuric acid solution, carrying out stirring leaching to obtain acid leaching slag and an acid leaching solution, mixing the acid leaching solution with sodium chlorate and a sodium hydroxide solution, stirring to obtain vanadium-rich slag and an acidic waste solution, and returning the acidic waste solution to the acid leaching step of the vanadium-iron concentrate; mixing the vanadium-rich slag with sodium carbonate, carrying out high temperature oxidization roasting to obtain a roasted sample, carrying out circulating water leaching on the roasted sample to obtain water leaching slag and a vanadium-rich solution, washing the water leaching slag by using water to obtain iron concentrate and a water washing solution, and returning the water washing solution to the circulating water leaching of the roasted sample of the vanadium-rich slag; and carrying out vanadium precipitation calcining on the vanadium-rich solution to obtain a product vanadic anhydride. The method has the characteristics of simple process, no pollution, high vanadium recovery rate, low content of impurities in the leaching solution, high purity of the product, and wastewater recycling.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for extracting vanadium by utilizing vanadium-titanium magnetite. Background technique [0002] Vanadium-titanium magnetite is one of the most important vanadium-containing resources in my country, and it is the main mineral source for extracting vanadium pentoxide. The traditional methods of extracting vanadium from vanadium-titanium magnetite include direct extraction and vanadium slag extraction. The direct extraction process is to add sodium chloride to the vanadium-titanium magnetite, and then perform sodium roasting at above 1000°C after pelletizing, and then recover the vanadium in it by water leaching. This method causes serious air pollution and low recovery rate of vanadium (Hukkanen, E ., Walden, H. The production of vanadium and steel from titanomagnetites [J]. International Journal of Mineral Processing, 1985, 15: 89-102), can also use calcification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/08
CPCY02P10/20
Inventor 朱晓波李望管学茂陆银平张乾
Owner HENAN POLYTECHNIC UNIV
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