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Technology for extracting vanadium from scherbinaite-containing coal mine by slurry electrolysis method

The technology of slurry electrolysis and vanadium stone is applied in the field of vanadium hydrometallurgy, which can solve the problems of coal mines without vanadium stone, and achieve the effects of saving pharmaceutical cost, low energy consumption and low reaction temperature.

Active Publication Date: 2014-09-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the slurry electrolysis method has made major breakthroughs in gold, silver, lead-zinc ores, but there is no example of applying it to vanadium-bearing stone coal mines.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Contains V in 1 ton 2 o 5 The grade is 0.75%, SiO 2 High silica coal mine with a grade of 88.33% is used as raw material;

[0030] After the raw material is ground until the particles with a fineness of -0.074mm account for 75% of the total mass of the raw ore, the vanadium-containing stone coal ore is added to the water at a liquid-solid mass ratio of 3:1 to obtain a mixed solution, and then poured into the mixed solution Add water glass (dispersant) and sodium hydroxide to obtain an alkaline vanadium-containing stone coal slurry with a pH value of 9.2; the water glass is added in a ratio of 3-4 mg per liter of mixed solution;

[0031] Mole ratio Cl - :V 3+ =2:1 Add sodium chloride to the alkaline vanadium-containing stone coal slurry, and then feed air into the cathode area for electrolysis. In order to ensure that the cathode will not produce hydrogen and explode, the air that feeds in needs to be excessive; in the present embodiment, each Tons of vanadium-conta...

example 2

[0033] Contains V in 1 ton 2 o 5 The grade is 1.18%, the carbon content is 15% high-carbon stone coal as raw material;

[0034] After the raw material is ground until the particles with a fineness of -0.074mm account for 73% of the total mass of the raw ore, the vanadium-containing stone coal ore is added to the water at a liquid-solid mass ratio of 4:1 to obtain a mixed solution, and then poured into the mixed solution Add water glass (dispersant) and sodium hydroxide to obtain an alkaline vanadium-containing stone coal slurry with a pH value of 9.8; the water glass is added in a ratio of 3-4 mg per liter of mixed solution;

[0035] Mole ratio Cl - :V 3+=2.5:1 Add sodium chloride to the vanadium-containing stone coal slurry, and then feed air into the cathode area for electrolysis. In order to ensure that the cathode will not produce hydrogen and explode, the air that feeds in must be excessive; in this embodiment, every ton The vanadium-containing stone coal mine is fed ...

example 3

[0037] Contains V in 1 ton 2 o 5 The grade is 0.67% and the calcium content is 4.23% high-calcium low-grade stone coal ore as raw material;

[0038] After the raw material is ground until the particles with a fineness of -0.074mm account for 78% of the total mass of the raw ore, the vanadium-containing stone coal ore is added to the water at a liquid-solid mass ratio of 5:1 to obtain a mixed solution, and then poured into the mixed solution Add water glass (dispersant) and sodium hydroxide to obtain an alkaline vanadium-containing stone coal slurry with a pH value of 10.5; the water glass is added in a ratio of 3-4 mg per liter of mixed solution;

[0039] Mole ratio Cl - :V 3+ =3:1 Add sodium chloride to the vanadium-containing stone coal slurry, then feed air into the cathode area for electrolysis, in order to ensure that the cathode will not produce hydrogen and explode, the air that feeds in needs to be excessive; in the present embodiment, every ton The vanadium-contai...

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PUM

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Abstract

The invention relates to a technology for extracting vanadium from scherbinaite-containing coal mine by a slurry electrolysis method, and belongs to the technical field of hydrometallurgy of vanadium. The technology comprises the following steps: adding water-soluble chlorine salt into slurry in an electrolytic cell by taking alkaline scherbinaite-containing coal slurry as a raw material according to the mole ratio of Cl<-1> to V<3+>= (2-3) to 1, stirring and electrolyzing under the condition of introducing oxygen-containing gas; and controlling the cell voltage to be 4.5-6V and the current density to be 10-40A / dm<2> in electrolysis. In electrolysis by introducing the gas, chlorine generated in an anode region acts as an oxidizing agent for leaching vanadium; air is ceaselessly introduced into a cathode region; oxygen in air in the cathode region reacts to generate OH<-1> ions so as to provide an alkaline environment for leaching vanadium; meanwhile, the explosion generated by the hydrogen evolution reaction in the cathode region and chlorine generated in the anode region can be prevented. According to the technology disclosed by the invention, the leaching rate of vanadium is greater than or equal to 90%, and the electrolytic current efficiency is greater than or equal to 95%. The technology provided by the invention has the advantages of short flow, high efficiency, low cost, high resource utilization ratio, environmental friendliness, safety and the like, and is convenient for industrial application.

Description

technical field [0001] The invention relates to a process for extracting vanadium from vanadium-containing stone coal mines by electrolysis of pulp, and belongs to the technical field of vanadium hydrometallurgy. Background technique [0002] Vanadium, silver-white metal, belongs to group VB in the periodic table of elements, atomic number 23, atomic weight 50.94, body-centered cubic crystal, common valences are +5, +4, +3, +2. Vanadium has a high melting point and is often called refractory metal together with niobium, tantalum, tungsten and molybdenum. It is malleable, hard and non-magnetic. It has the ability to resist hydrochloric acid and sulfuric acid, and its performance in resisting gas-salt-water corrosion is better than most stainless steels. It is not oxidized in the air, soluble in hydrofluoric acid, nitric acid and aqua regia. [0003] Vanadium is widely distributed in nature, but the distribution is quite scattered. There is no rich ore mined alone. It mainl...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B34/22
CPCY02P10/20
Inventor 孙伟王丽胡岳华刘佳鹏刘润清
Owner CENT SOUTH UNIV
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