Method for extracting V2O5 from stone coal navajoite

Abstract

The invention discloses a method for extracting V2O5 from stone coal navajoite, comprising the following steps of: firstly crushing stone coal navajoite, and finely grinding till the stone coal navajoite of which the screen meshes is -100 is more than 80%; pretreating the mineral powder by concentrated sulfuric acid, wetting the mineral powder by water, and adding concentrated sulfuric acid in the process of pretreatment, wherein the use level of the concentrated sulfuric acid is less than 15% of the weight of the mineral powder, and pretreating for 1-8hours under the temperature of 80-180DEG C; and leaching the pretreatment material by water, wherein the leaching temperature is less than or equal to 50DEG C, and the leaching time is less than or equal to 5hours, neutralizing and oxidizing a vanadium-containing solution obtained in a leaching way, enriching the oxidized vanadium-containing solution by a method of ion exchange or extraction, purifying and removing impurity, so that the vanadium-enriched solution can be obtained, precipitating by ammonium salt to obtain ammonium metavanadate or poly-vanadate precipitate, and calcining the precipitate, so that a V2O5 product can be obtained. The method provided by the invention has the advantages of being small in investment, low in energy consumption, small in pollution, simple to operate, suitable for the industrial application, etc.

Description

technical field [0001] The invention relates to a rare metal hydrometallurgical process in the field of metallurgy, in particular to a method for wet extraction of V from vanadium ore. 2 o 5 Methods. Background technique [0002] Stone coal vanadium ore is an important vanadium-containing resource. At present, V is extracted from stone coal vanadium ore at home and abroad. 2 o 5 The current technology mainly includes pyro-wet combined process and all-wet process. [0003] The fire-wet combined process that has been developed mainly includes sodium roasting-acid leaching or water leaching, calcification roasting-acid leaching or water leaching, blank roasting-acid leaching, sulfate roasting-water leaching, etc. The main principle is to oxidize the trivalent vanadium in the ore to tetravalent or pentavalent vanadium through high-temperature roasting, and destroy the mineral structure so that the vanadium is dissociated from the mica crystal phase. Vanadium is transferred ...

AI Technical Summary

Problems solved by technology

Among them, the normal temperature and pressure sulfuric acid heap leaching process is used to treat stone coal vanadium ore. After mixing the ore sample with sulfuric acid, it is wet piled at normal temperature and pressure for 3 to 15 days, and then stirred and water leached. The vanadium leaching rate is over 90%. Low production cost, less environmental pollution, but long production cycle and large consumption of sulfuric acid

The stone coal vanadium ore is treated by atmospheric pressure mixed acid leaching method, and the ore sample is directly treated with H 2 SO 4 Mixed acid leaching with HF, and adding NaClO as an oxidant, the vanadium leaching rate is over 85%. This process is suitable for treating stone coal mines with different vanadium grades. The equipment needs special anti-corrosion treatment, and the production cost is high

Use hydrochloric acid-ferrous salt leaching method to treat stone coal vanadium ore. The stone coal concentrate after flotation decarburization is firstly added with hydrochloric acid to adjust the pH of the slurry to 4 After oxidation, vanadium is extracted by ion exchange method, and the recovery rate of vanadium is over 85%. This process adopts closed production, which will not cause environmental pollution, but the process is long, the consumption of reagents is large, and a large amount of impurity ions are introduced during the process, making it difficult to treat wastewater

Oxygen pressure sulfuric acid leaching method is used to treat stone coal vanadium ore. The ore sample is directly added with sulfuric acid and stirred and leached at 150°C-180°C. The control pressure is 1.2MPa. The vanadium leaching rate can reach more than 90% when two-stage pressure leaching is adopted; The process is short, the operation is simple, the vanadium leaching rate is high, and the environment is less polluted, but the pressure acid leaching operation has higher requirements on equipment, the process consumes a lot of energy, acid, and production costs are high

The high-temperature high-acid leaching method is used to treat stone coal vanadium ore. After the ore sample is ground, it is evenly mixed with 300g / L sulfuric acid solution, and stirred and leached at 90°C for more than 16 hours. This process is short, but it consumes a lot of energy and acid. Severe corrosion of equipment and high impurity content in the leaching solution are not conducive to the recovery of vanadium in subsequent processes

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