Desulphurization and vanadium extraction technique for calcinated vanadium ore

Abstract

The invention provides a process for primary desulfurization and secondary vanadium purification of roasted vanadium ores. The process takes sodium salts which do not contain chlorine ions as a roasting additive of vanadium ores and molds the vanadium ores; and the roasted sodium-containing vanadium ores are used for reclaiming SO2 gas generated in the roasting process at first, and diluted acid is used for immersion and vanadium purification. The maximum characteristic of the process is that the sodium-containing vanadium ores are taken as alkaline desulfurized substances and circulated intoa desulfurizing tower; Na<+> ions in the vanadium ores are recycled in the form of intermediate carriers; when the concentration of the Na<+> ions in a circulating absorption liquid reaches a certainvalue, the recovery rate of the SO2 gas generated in the roasting process can be improved and the amount of sulfuric acid in the procedure of immersion in the diluted acid and vanadium purification can be reduced; and sodium salt wastewater can be taken as the roasting additive of the vanadium ores instead of the sodium salts which do not contain the chlorine ions, so that the problem of severe environmental pollution of a large quantity of sodium salt wastewater and the SO2 gas produced in the conventional technological line is solved, and the process is a novel environment-friendly stone-like coal vanadium purification process having the advantages of utilization of waste materials to produce waste materials, high resource utilization rate, low production cost, small environmental pollution and even non pollution.

Description

technical field The invention belongs to the technical field of flue gas desulfurization and dust removal, and hydrometallurgy, and particularly relates to a method of using sodium salt without chloride ions as an additive, and the roasted sodium-containing vanadium ore is first used to recover SO produced in the roasting process. 2 Gas, and then dilute acid leaching new technology to extract vanadium. Background technique Vanadium pentoxide and other vanadium compounds are widely used in steel, non-ferrous alloys, chemicals, petroleum, aerospace, medical and other industries. At present, the market demand for vanadium is increasing year by year, and the supply is in short supply. The sales market of vanadium products has a good prospect. my country is rich in vanadium resources, among which: V in vanadium-titanium magnetite 2 o 5 Reserves are 12.6 million tons, distributed in stone coal in Hunan, Hubei, Zhejiang, Jiangxi and other provinces V 2 o 5 The predicted reser...

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Problems solved by technology

The main problems of this type of method are: a large amount of Cl is produced in the roasting process 2 , HCl, SO 2 , SO 3 and other harmful gases, pollute the environment, and corrode equipment; at the same time, a large amount of high-concentration ammonia nitrogen wastewater is discharged in the follow-up vanadium precipitation process, causing serious water pollution; not only that, V 2 o 5 The extraction rate is generally only about 50%, the resource utilization rate is low, and the waste is large

These methods, while avoiding the Cl 2 and HCl gas generation, but the conversion rate is not high, SO 2 Problems such as pollution and difficulty in the treatment of ammonia nitrogen wastewater after vanadium deposition make it difficult to popularize and apply in actual production

For example, the Hunan Provincial Coal Research Institute once used sodium-free blank roasting, N 263 New processes such as solvent extraction, but due to immature production process conditions and low product yields, industrial production has not been realized

Chinese invention patent application 20061003913.5 discloses a method for extracting V from stone coal vanadium ore 2 o 5 method, which uses slaked lime as a sulfur fixative and NH 3 -N wastewater absorbent to reduce SO 2 and NH 3 -N wastewater pollution, but there are disadvantages such as low vanadium extraction rate, high production cost, lengthy and complicated process, and failure to comprehensively treat and recycle waste gas, wastewater, and waste residues.

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