A method for extracting vanadium by heap leaching of vanadium-containing stone coal with concentrated sulfuric acid and additives

Abstract

The invention provides a method for extracting vanadium by heap leaching and adding concentrated sulfuric acid and an additive in vanadium-containing stone coal. The method comprises the following specific steps: smashing stone coal ore; proportioning based on weight part, evenly mixing proportioned stone coal ore powder, concentrated sulfuric acid and an additive aqueous solution through mechanical stirring until small pellets are generated and piled to be in a cone shape, and reacting for 2-5 days; feeding the stone coal ore powder subjected to complete heap leaching reaction to an agitation leaching reaction kettle, adding water in a solid-liquid ratio of 1: (0.8-1.2) for mechanical agitation leaching; adding a reducer sodium thiosulfate for reduction, adding calcium carbonate to regulate the PH value, and carrying out solid-liquid separation in a belt filter or a plate-and-frame filter press so as to obtain a blue mother liquid containing vanadium; and extracting the mother liquidwith a solvent or carrying out ion exchange, vanadium precipitation, drying and forging on the mother liquid so as to obtain vanadium pentoxide. By using the method, the grinding cost of the ore is saved and reduced, and grinding equipment and capital construction installation investments are reduced.

Description

technical field [0001] The invention relates to the field of chemical metallurgy, in particular to a method for extracting vanadium by heap leaching of vanadium-containing stone coal with concentrated sulfuric acid and additives. Background technique [0002] According to the comprehensive exploration conducted by the National Geological Department in the 1970s, the reserves of vanadium-containing stone coal in my country exceed the sum of the proven reserves of vanadium pentoxide resources in other countries in the world. Vanadium is a rare metal with a high melting point and has many excellent properties. It is widely used in metallurgy, chemical industry and other industries. With the rapid development of my country's modernization, the demand for vanadium and its compounds is increasing. Especially in recent years, the research and development of vanadium batteries will bring a new revolution in the field of energy. However, vanadium ore resources are scarce and scatt...

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Problems solved by technology

[0004] The above methods have the disadvantages of high requirements on the fineness of mineral powder, long stirring and leaching time, and long wet stacking time, which lead to high production costs and large equipment investment.