Efficient vanadium extraction method by performing alkali roasting on vanadium mineral

Abstract

The invention discloses an efficient vanadium extraction method by performing alkali roasting on vanadium mineral. The method comprises the following processing steps of: (1) mixing the vanadium mineral with sodium hydroxide or potassium hydroxide for pellet fabrication, and oxidizing and roasting pellets at the temperature of 300-700 DEG C to obtain roasted clinker; (2) leaching the roasted clinker using water or aqueous alkali corresponding to the step 1, and then carrying out solid-liquid separation to obtain leaching residue and a vanadium dissolution solution; and (3) cooling and crystallizing silicon-removed vanadium digestion solution to obtain vanadate. The alkali roasting is used by the method provided by the invention, because alkali can function as a caking agent in the aggregating process, the caking agent can be saved; not only is the roasting temperature reduced largely and process flow largely shortened, but also no waste gas, ammonia-nitrogen wastewater and the like are discharged, as well as a leachate can be recycled; and a silicate phase can be directly destroyed to promote the destroy and the oxidization of a vanadium phase, and the oxidative enveloping and the leaching hindering of the silicate phase to the vanadium can be prevented so that the efficient vanadium leaching can be realized and the leaching rate can reach more than 95%.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical metallurgy, in particular to a method for efficiently extracting vanadium by alkaline roasting of vanadium-containing minerals. Background technique [0002] Vanadium-containing minerals generally include vanadium-titanium magnetite, vanadium slag, vanadium extraction tailings, stone coal, siliceous rock vanadium ore and other vanadium-containing gangue ores and smelted vanadium-containing slag. Vanadium-titanium magnetite and stone coal are mainly used as raw materials for extracting vanadium in my country's vanadium chemical industry. Among them, the main components of the iron ore concentrate obtained after magnetic separation of vanadium-titanium magnetite are iron and titanium, and the grade of vanadium in the ore is very low, about 0.5% to 0.8%. At present, there are two main methods for extracting vanadium from iron concentrates, one is to extract vanadium directly from iron conc...

AI Technical Summary

Problems solved by technology

The recovery rate of vanadium in the sodium roasting process is low, the recovery rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multiple roasting is only 80%; the roasting temperature is high (750-850 ° C), and multiple roasting is required , high energy consumption; in the roasting process will produce harmful HCl, Cl 2 and other corrosive gases, polluting the environment

[0004] In summary, in the prior art, the process of extracting vanadium from vanadium-containing minerals generally has high roasting temperature, low vanadium conversion rate and recovery rate, and there are problems such as toxic gas and a large amount of acidic ammonia nitrogen wastewater discharge in the process of vanadium recovery.

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