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Method for extracting vanadium from mixed vanadium slag and vanadium-containing steel slag through pressurization

A technology of steel slag and vanadium slag, applied in the direction of improving process efficiency, etc., can solve the problems of reducing leaching rate, high price, and loss of KOH medium, and achieve the effect of reducing energy consumption and increasing leaching rate

Active Publication Date: 2017-10-10
HEBEI IRON AND STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the KOH medium is expensive, and the mass ratio of KOH to steel slag is 3:1 to 5:1, the reaction alkali concentration is 60% to 90%, and the loss of KOH medium is large, resulting in high production costs and low product benefits.
[0005] CN102094123A proposes a method for extracting vanadium from vanadium-containing steel slag using a high-concentration sodium hydroxide medium. The reaction temperature of this method is 180-240°C. Vanadium is extracted by wet method, and there is no waste gas and dust pollution in the process; the disadvantage is that the alkali concentration The alkalinity is high, and the alkalinity is 65% to 90%, which leads to the high heat required for evaporation and concentration during medium recycling, and the production cost is high, and the residual V in the final slag is high, which reduces the leaching rate and the final slag. V content is 0.3%~0.5%
At present, no patent has been found on NaOH pressure leaching vanadium-containing steel slag and vanadium slag mixed vanadium raw material

Method used

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  • Method for extracting vanadium from mixed vanadium slag and vanadium-containing steel slag through pressurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put vanadium-containing steel slag and vanadium slag mixed with vanadium raw materials into the pressure reactor, the mass ratio of vanadium-containing steel slag to vanadium slag is 1:10, and at the same time, add 20wt % NaOH solution. Seal the pressurized reaction kettle, feed oxygen and heat for leaching reaction, control oxygen partial pressure to 0.2MPa, leaching reaction temperature to 120°C, leaching reaction pressure to 0.6MPa, and reaction time to 0.5h. After the reaction, the reaction kettle is cooled to 60°C and the reaction kettle is opened, and the obtained mixed slurry is filtered and separated to obtain vanadium-containing leaching solution and tailings. The vanadium-containing leaching solution is crystallized and separated to obtain sodium vanadate product, and the separated crystallized liquid is circulated for leaching reactions.

[0039] After testing, the leaching rate of vanadium is 85%.

Embodiment 2

[0041] Put vanadium-containing steel slag and vanadium slag mixed with vanadium raw materials into the pressure reaction kettle, the mass ratio of vanadium-containing steel slag to vanadium slag is 1:8, and at the same time add 24wt % NaOH solution. Seal the pressurized reaction kettle, feed oxygen and heat for leaching reaction, control oxygen partial pressure to 0.1MPa, leaching reaction temperature to 140°C, leaching reaction pressure to 0.5MPa, and reaction time to 1.5h. After the reaction, the reaction kettle is cooled to 75°C, and the reaction kettle is opened, and the obtained mixed slurry is filtered and separated to obtain vanadium-containing leaching solution and tailings. The vanadium-containing leaching solution is crystallized and separated to obtain sodium vanadate product, and the separated liquid is circulated after crystallization for leaching reactions.

[0042] After testing, the leaching rate of vanadium is 91%.

Embodiment 3

[0044] Put vanadium-containing steel slag and vanadium slag mixed with vanadium raw materials into the pressure reactor, the mass ratio of vanadium-containing steel slag to vanadium slag is 1:6, and at the same time add 45wt % NaOH solution. Seal the pressurized reaction kettle, feed oxygen and heat for leaching reaction, control oxygen partial pressure to 0.2MPa, leaching reaction temperature to 120°C, leaching reaction pressure to 0.7MPa, and reaction time to 1.8h. After the reaction, the reaction kettle is cooled to 65°C and the reaction kettle is opened, and the obtained mixed slurry is filtered and separated to obtain vanadium-containing leaching solution and tailings. The vanadium-containing leaching solution is crystallized and separated to obtain sodium vanadate product, and the separated crystallized liquid is circulated for leaching reactions.

[0045] After testing, the leaching rate of vanadium is 95%.

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Abstract

The invention relates to a method for extracting vanadium from mixed vanadium slag and vanadium-containing steel slag through pressurization. The method comprises the steps of mixing a mixture of vanadium slag and vanadium-containing steel slag and a sodium hydroxide solution and introducing oxygen to conduct reaction under the action of pressurization; and conducting solid-liquid separation on slurry obtained after reaction to obtain vanadium-containing leaching liquor. According to the method, vanadium-containing steel slag and vanadium slag are mixed and are subjected to pressurization and oxidation treatment; the leaching rate of the two kinds of vanadium raw materials is increased, and the subsequent desilication and impurity removal process is omitted. The method is a high-efficiency and low-cost vanadium extraction method. In the treatment process, the roasting process is omitted, energy consumption is reduced, and no harmful roasting kiln gas is generated. The adopted leaching liquor can be cyclically used for leaching vanadium raw materials. In the whole process, wastewater discharge is avoided, and the method is a clean vanadium extraction method. The method is applicable to industrial production and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of vanadium chemical metallurgy, in particular to a method for extracting vanadium under pressure by mixing vanadium slag and vanadium-containing steel slag. Background technique [0002] Vanadium-containing steel slag is a by-product of smelting vanadium-titanium magnetite, which is formed by vanadium-containing molten iron steelmaking. 2 o 5 In 2%-10% steel slag (compared with vanadium slag, its calcium content is large). There are two ways for its production process, one is that the remaining vanadium in the semi-steel is oxidized into the slag after steelmaking, and the other is that the vanadium-containing steel slag is obtained by direct steelmaking of molten iron without blowing vanadium slag. Vanadium-containing steel slag has the following characteristics: (1) high content of CaO and iron, perfect crystallization, dense texture, and poor dissociation degree; (2) complex composition and large fluct...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B7/04
CPCC22B7/008C22B7/04C22B34/22Y02P10/20
Inventor 李兰杰杜浩刘彪高明磊王少娜郑诗礼王海旭秦学宇
Owner HEBEI IRON AND STEEL