Process for efficiently extracting vanadium from stone coal vanadium ore

Abstract

The invention discloses a process for efficiently extracting vanadium from stone coal vanadium ore. The process comprises the following steps that (1) the stone coal vanadium ore is put into a leaching tank, then dilute sulfuric acid is added into the leaching tank, and stirring is started; (2) a leaching agent containing NO2 gas is introduced into the leaching tank for making a leaching reaction;and (3) solid-liquid separation is performed after the leaching reaction is completed to obtain a vanadium-contained leaching agent. According to the provided process for efficiently extracting the vanadium from the stone coal vanadium ore, roasting is not needed, low acid leaching is directly adopted, and moreover, NO2 is used as the leaching agent, so that the leaching rate is high, the acid consumption is low, moreover, the process is simple, the cost is low, and the process is suitable for large-scale industrial popularization.

Description

technical field [0001] The invention relates to the technical field of rare metal extraction, and more specifically relates to a process for efficiently extracting vanadium from stone coal vanadium ore. Background technique [0002] In my country's vanadium ore resources, stone coal vanadium ore is a very important part. The total reserves of stone coal vanadium ore are 7 times the total reserves of vanadium in vanadium-titanium magnetite, exceeding the sum of the reserves of vanadium pentoxide in other countries in the world. [0003] my country began to study vanadium extraction from stone coal vanadium ore in the 1960s, and industrial production began in the 1970s. The technology of vanadium extraction from stone coal vanadium ore can be briefly summarized as follows: first, roasting under high temperature and aerobic conditions to make vanadium silicate minerals The structure is destroyed, the trivalent vanadium in the stone coal vanadium ore is oxidized and generates me...

AI Technical Summary

Problems solved by technology

Calcium roasting has solved the problem of air pollution, but the roasting process is greatly affected by the type and properties of the ore, and the roasting atmosphere, time, temperature, and calcium salt dosage are also very sensitive. If the control is not proper, it is easy to form insoluble silicate , so that part of the vanadium is wrapped by "silicon oxygen", or part of the vanadium in the ore sample forms insoluble compounds such as iron vanadate and calcium vanadate with iron, calcium and other elements

Blank roasting is mainly to solve the problem of decarbonization of stone coal and oxidation of low-priced vanadium, but the roasting equipment is still traditional shaft kiln, flat kiln and fluidized fluidized furnace, not only the production scale is limited, but also the roasting process does not change the crystal structure of vanadium-containing minerals. Can not effectively improve the recovery rate of vanadium

Although the wet acid leaching process does not require roasting, in order to obtain a higher V 2 o 5 leaching rate, had to consume a large amount of H 2 SO 4 , while V 2 o 5 The leaching rate is generally about 65% to 75%, and the purification and impurity removal of acidic leachate, Fe(III) reduction and pH value adjustment and other processes need to consume a large amount of chemicals, resulting in increased production costs