Method for extracting vanadium from high-calcium vanadium-containing materials

Abstract

The invention relates to a method for extracting vanadium from a high-calcium vanadium containing material, which belongs to the vanadium metallurgy. The invention aims at solving the technical problem for providing a method for extracting vanadium from a high-calcium vanadium containing material with low production cost. The method comprises the following steps: a, reducing the high-calcium vanadium containing material in an acid leaching manner: mixing the high-calcium vanadium containing material with water and sulfuric acid until the pH of the solution is 1 to 2.5, adding a reducing agent, and carrying out the solid-liquid separation after sufficient reaction to obtain a VOSO4 solution; b, adding ammonium salt into the VOSO4 solution obtained after the solid-liquid separation in the step a, precipitating the vanadium under the condition that the pH value is 4 to 7, and washing and calcining the precipitate to obtain vanadium pentoxide. By adopting the method, the vanadium in the high-calcium vanadium containing material can be effectively extracted and recovered, the process cost is low, the process is simple and reliable, the recovery rate of the vanadium is high, and the mass industrial production requirement can be met. An effect for converting the waste into treasure can be achieved through the method for the high-calcium low-vanadium waste.

Description

technical field [0001] The invention relates to a method for extracting vanadium from high-calcium vanadium-containing materials, belonging to the field of vanadium metallurgy. Background technique [0002] my country's vanadium-containing materials are widely distributed. At present, the methods for extracting vanadium from vanadium-containing solid materials mainly include: acid leaching and alkali solution vanadium extraction method, steel slag return vanadium extraction method, sodium roasting vanadium extraction method, direct roasting vanadium extraction method, calcification Roasting vanadium extraction method, solvent extraction vanadium extraction method and ion exchange vanadium extraction method. [0003] Vanadium-titanium magnetite is smelted to obtain vanadium-containing molten iron. During converter steelmaking, vanadium is transferred into slag as an impurity to obtain high-calcium vanadium slag. The calcium oxide content in the slag is as high as 30-60wt%. D...

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Problems solved by technology

The method V 2 o 5 The recovery rate is higher, can reach 75~85%, but this method needs to add a large amount of sulfuric acid (by dry weight, 1kg ore powder needs to consume 0.237kg H 2 SO 4 ), the acid consumption is high, and in addition, high-temperature acid leaching further increases the cost, and because it uses excessive acid and high-temperature acid leaching, the leaching solution contains a large amount of impurities, and the leaching solution needs to go through the steps of adding ammonia water to remove impurities before extraction. again increased production costs

And this method is mainly aimed at the vanadium recovery of high-silicon vanadium-containing materials. For vanadium-containing materials with a calcium oxide content greater than 15wt%, even if high temperature is used and excessive sulfuric acid is added, the leaching rate of vanadium is difficult to reach more than 25%. Therefore, This method is also not suitable for vanadium recovery of high-calcium vanadium-containing materials

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