Process for extracting vanadium from stone coal by acid method by using leaching agent

Abstract

The invention discloses a process for extracting vanadium from stone coal by an acid method by using a leaching agent. The process comprises the following steps of: rude ore crushing, acid leaching, liquid-solid separation, solution pretreatment, extraction and back-extraction, oxidization of the vanadium precipitation, and red vanadium deamination, wherein a CaF2-containing leaching agent is added in the step of rude ore crushing or / and acid leaching and pulping; and the weight ratio of rude ore to CaF2 is 100:1-8. Due to the adoption of the process, the technical problem that the leaching rate of vanadium-containing stone coal is low is solved; the leaching rate is high; specific yield is improved; and unit cost is saved.

Description

technical field [0001] The invention relates to a process for extracting vanadium from stone coal by an acid method, in particular to a process for extracting vanadium by an acid method from stone coal using a leaching aid. Background technique [0002] As we all know, vanadium-containing stone coal is one of the unique and rich vanadium resources in my country, but for a long time, the vanadium extraction process from vanadium-containing stone coal has been dominated by the classic salt roasting process. development requirements; second, the recovery rate of vanadium is extremely low, usually ≤ 50%, such a low recovery rate is also a great waste of my country's rich vanadium-containing stone coal resources; third, the degree of mechanized continuous operation is poor, especially The original two-step vanadium sinking method is difficult to scale up. For this reason, this old technology has been discontinued or banned by the government. [0003] Instead, the vanadium extracti...

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Problems solved by technology

[0004] However, compared with the hydrometallurgical process of other elements, its total recovery rate is still low, the root cause is that the leaching rate cannot increase, and the reason why the leaching rate of vanadium-containing stone coal is low has many reasons, including low-valence vanadium (V +2 , V +3 ) is generally mostly in the majority, and it is also closely related to its occurrence state. Most of the vanadium in stone coal is isomorphic. On the contrary, there are very few vanadium in the adsorption state. It is very difficult to destroy this structure, so it causes leaching. low rate

Therefore, how to increase the leaching rate is also the key to the process of extracting vanadium from stone coal. At present, there are no reports, literature records or practical applications on how to increase the leaching rate.

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