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Method for leaching vanadium by anode electrolysis in strong alkali electrolyte solution

A technology of strong alkali electrolyte and anode electrolysis, which is applied in the field of leaching vanadium from vanadium iron spinel minerals by electrolysis, which can solve the problems of increasing production costs, increasing production costs, increasing energy consumption, etc., and achieves pollution reduction and convenient operation , to handle the effect of easy

Inactive Publication Date: 2019-07-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method still has many deficiencies, the electrolytic solution uses potassium hydroxide as the electrolyte, which increases the production cost, and the mass ratio of potassium hydroxide and vanadium slag is between 4:1~6:1, and the concentration of potassium hydroxide is relatively large. It is highly corrosive; before the electrolysis reaction, it is necessary to mix and heat the vanadium slag and potassium hydroxide aqueous solution at a temperature of 100°C to 150°C, thereby increasing energy consumption; during the electrolysis process, it is necessary to continuously feed into the reaction system Oxidizing gas, and the use of nickel plates or rods for anodes increases production costs

Method used

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  • Method for leaching vanadium by anode electrolysis in strong alkali electrolyte solution
  • Method for leaching vanadium by anode electrolysis in strong alkali electrolyte solution
  • Method for leaching vanadium by anode electrolysis in strong alkali electrolyte solution

Examples

Experimental program
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Effect test

Embodiment 1

[0084] (1) Preparation of vanadium-iron spinel: using vanadium trioxide and ferric oxide as initial raw materials, roasting at 1200°C for 48 hours in a reducing atmosphere to obtain Fe 2 VO 4 .

[0085] (2) Using the pure vanadium-iron spinel obtained in step (1) as a raw material to make an anode, the diameter of the anode is 10mm, and the thickness is about 3mm.

[0086] (3) The electrolytic reaction is carried out in an electrolytic cell at normal temperature and pressure. The cathode material of the electrolytic cell is a graphite rod with a diameter of 6mm, the center distance between the anode and the cathode is 5cm, and the electrolytic solution is 35% sodium hydroxide solution.

[0087] (4) The cell voltage is selected as 5V, the electromagnetic stirring speed is 500r / min, the electrolysis temperature is room temperature, and the electrolysis reaction is selected as 1h.

[0088] (5) After the electrolysis reaction starts, record the relationship between current and t...

Embodiment 2

[0090] (1) Using vanadium-iron-spinel-type vanadium concentrate as the initial raw material, ball mill the vanadium concentrate to a particle size of 0.074mm or less.

[0091] (2) take by weighing the vanadium-iron-spinel type vanadium concentrate and 0.4g pure vanadium-iron-spinel (Fe) after the ball milling 2 VO 4 ) in an agate mortar, add 3 drops of 5% polyvinyl alcohol solution (about 0.1 g) and mix well, then press it into a round block with a diameter of 10 mm and a thickness of about 3 mm.

[0092] (3) Place the produced round block in a high-temperature furnace, and bake it for 6 hours at a temperature of 800° C. under a reducing atmosphere to make an anode with electrical conductivity.

[0093] (4) electrolytic reaction is carried out in normal temperature and pressure electrolyzer, and the cathode material of described electrolyzer is the graphite rod of diameter 6mm, and the center-to-center distance between anode and cathode is 5cm, and electrolytic solution is 35% ...

Embodiment 3

[0097] (1) Using vanadium-iron-spinel-type vanadium concentrate as the initial raw material, ball mill the vanadium concentrate to a particle size of 0.074mm or less.

[0098] (2) Weigh 0.8g of ball-milled vanadium-iron-spinel-type vanadium concentrate in an agate mortar, add 3 drops of polyvinyl alcohol solution (about 0.1g) with a mass fraction of 5%, mix well, then press Form into a round block with a diameter of 10mm and a thickness of about 3mm.

[0099] (3) Place the produced round block in a high-temperature furnace, and bake it for 6 hours at a temperature of 800° C. under a reducing atmosphere to make an anode with electrical conductivity.

[0100] (4) The electrolytic reaction is carried out in an electrolytic cell at normal temperature and pressure; the cathode material of the electrolytic cell is a graphite rod with a diameter of 6mm, the center distance between the anode and the cathode is 5cm, and the electrolytic solution is 35% sodium hydroxide solution.

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Abstract

The invention belongs to the field of leaching vanadium from ferrovanadium spinel minerals by an electrolysis method, and particularly relates to a method for leaching vanadium by anode electrolysis in a strong alkali electrolyte solution. The method comprises the following steps of preparing ferrovanadium spinel type vanadium-containing concentrate into a soluble anode and directly electrolyzingin the strong alkali electrolyte solution to obtain vanadium-containing leachate. In the method, iron contained in the anode is oxidized into ferrate ions which enter the solution, and the ferrate ions further promote the oxidation and leaching of vanadium in the vanadium-containing concentrate, and at the same time, pollution-free oxygen is precipitated on the anode surface. In addition, the ferrate ions entering the electrolyte solution are reduced by water and hydrogen generated by a cathode to form ferric oxide or / and ferric hydroxide precipitate, so that vanadium and iron are separated from the solution. The method electrolyzes the ferrovanadium spinel type vanadium-containing concentrate at normal temperature and pressure without adding any oxidant by utilizing the conductivity of ferrovanadium spinel and ferrate ions with the strong oxidizing property generated by electrolysis.

Description

technical field [0001] The invention belongs to the field of leaching vanadium from vanadium-iron-spinel type minerals by electrolysis, and in particular relates to a method for anode electrolytic leaching of vanadium in a strong alkali electrolyte solution. Background technique [0002] Vanadium is an important alloying element. Vanadium-containing steel has excellent characteristics such as high strength, high toughness, and good wear resistance. It is widely used in machinery, aviation, electronic technology, and national defense industries. Among other things, vanadium is used in the production of rechargeable hydrogen batteries or vanadium redox batteries. And vanadium-containing superconducting materials have also received extensive attention because of their excellent performance. [0003] At present, the sources of vanadium are mainly vanadium-titanium magnetite and vanadium-containing stone coal. The vanadium-titanium magnetite is smelted in a blast furnace and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B34/22
CPCC22B3/045C22B3/12C22B34/22Y02P10/20
Inventor 闫柏军陈学鑫
Owner UNIV OF SCI & TECH BEIJING
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