Method for preparing V2O5 through water vapor charring pretreatment of high-silicon vanadium-containing stone coal

Abstract

The invention relates to a method for preparing V2O5 through water vapor charring pretreatment of high-silicon vanadium-containing stone coal. The method comprises the following steps: crushing the high-silicon vanadium-containing stone coal by ball mill to 100-200 meshes, stirring and mixing the obtained mineral powder and concentrated sulfuric acid according to a mass ratio of 1:(0.2-0.4), adding 8-15% of an initiator solution to the above obtained mixture, and stirring the mixture and the initiator solution for 20-30 min; filling a hopper truck with the stirred wet sand-shaped mixture, pushing the hopper truck to a water vapor charring room, and charring the wet sand-shaped mixture at 150-250 DEG C; and carrying out two-stage vanadium leaching on the obtained charring residues according to a solid / liquid ratio of 1.0-20 L / Kg, and carrying out a technology for preparing V2O5 through routine hydrometallurgy on a filtrate which is a blue solution in order to obtain the V2O5 product with the purity of 99.5% or above. The method has the advantages of no calcination of ores, no generation of poisonous or harmful exhaust gas, low energy consumption and high vanadium leaching rate, and is a clean and environmentally-friendly V2O5 preparation method.

Description

technical field [0001] The patent of this invention relates to hydrometallurgical vanadium extraction technology, especially a kind of V 2 o 5 Methods. Background technique [0002] Vanadium is an important strategic substance with good alloying and catalytic properties, and has a wide range of uses in chemical industry, automobile, energy, national defense, aviation and other fields. In my country, vanadium is mainly extracted from stone coal or vanadium-titanium magnetite. Most of the vanadium in stone coal exists in the form of V (III) and V (IV), and most of them are in the form of isomorphic The form occurs in silicate minerals, the crystal structure is firm, and it is difficult to leach. In order to effectively extract vanadium from stone coal, it is usually necessary to high-temperature roast the vanadium-containing stone coal to destroy the mineral structure, simultaneously oxidize V(III) vanadium to V(IV) or V(V), and then use solution to leach vanadium. Judging ...

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For example, Fan Gang et al. (Fan Gang, Li Minting, Wei Chang, Li Cunxiong, Deng Zhigan. Research on the behavior of silicon in high silica coal oxygen pressure acid leaching. Comprehensive utilization of mineral resources, 2008, (4):6-8) in high pressure Add 35% H to the reactor 2 SO 4 Solution, adding auxiliary agent, and passing oxygen to carry out leaching of vanadium, the leaching rate is up to 70%, and the leaching rate of this method is not high. If a high-pressure reactor is used in actual production, the facilities are expensive and it is difficult to expand production

Jin Lin et al. (Jin Lin, Pu Shikun, Li Shanji. A study on the process of recovering vanadium from high-silicon and high-carbon vanadium ore[J], Rare Metals and Cemented Carbide, 2011, 39(2): 6-9) in In the laboratory, high-silicon and high-carbon vanadium ore is prepared by roasting at 500°C-sulfuric acid leaching-P204 extraction to extract vanadium. When the leaching solution is heated to 85-95°C, the vanadium leaching rate can reach 98.52%. In industry, kilns need to be built, and leaching tanks need to be heated to above 85°C, which will inevitably cause excessive energy consumption.

Sun Desi et al. (Sun Desi, Sun Jianqi, Zhang Xianzhen. Research on vanadium extraction process of siliceous stone coal vanadium ore with non-polluting oxidant oxidation-acid leaching method [J]. Nonferrous Metals, 2011, 63 (2): 175-178) The siliceous stone coal in Hukou County, Jiangxi Province uses 40% H 2 SO 4 The solution is leached, and 5% manganese dioxide is added as an oxidant during the leaching process, and the leaching solution is heated to 90°C. The experimental results show that the leaching rate of vanadium is 72.4%, which is not ideal.

[0004] To sum up, among the current methods for extracting vanadium from high-silicon vanadium-containing stone coal, some require high-temperature roasting, and some require special equipment, especially when the leaching solution needs to be heated above 90°C. It is more suitable for theoretical research, but when large-scale extraction of vanadium is carried out in industry, there are disadvantages of large investment, high energy consumption and difficult operation

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