Method for recycling vanadium from vanadium-containing steel slag

A steel slag and tailing slag technology, applied in the field of vanadium recovery, can solve the problems of difficult separation, reduce waste water production and discharge, and low leaching rate, and achieve the effects of reducing reaction temperature, raw material cost, and production cost

Inactive Publication Date: 2012-07-18
HEBEI IRON AND STEEL
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this method only stays in the stage of laboratory research, and the proportion of phosphate is large, the cost is high, and there is no industrial promotion at present.
Direct acid leaching refers to the complete wet extraction of vanadium without roasting process. However, due to the high content of CaO in steel slag, the acid consumption is large and the cost is high; Difficult for subsequent separation
[0004] Chinese patent CN102071321A proposes a method for extracting vanadium and chromium from vanadium-containing steel slag with a high-basic potassium hydroxide medium. This method does not require high-temperature roasting, and the reaction temperature is reduced to 160-240°C. Vanadium and chromium are extracted by wet method. effectively prevents C 12 , HCl, SO 2 , dust and other air pollutants, and reduce the amount of waste water production and discharge; the disadvantage is tha

Method used

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  • Method for recycling vanadium from vanadium-containing steel slag
  • Method for recycling vanadium from vanadium-containing steel slag

Examples

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Effect test

Embodiment 1

[0026] Example 1: figure 1 As shown, the method for recovering vanadium from vanadium-containing steel slag adopts the following process steps.

[0027] (1) Response (i.e. figure 1 stripping under pressure): in the autoclave, add vanadium-containing steel slag and 30wt% NaOH solution; wherein, sodium hydroxide solution: vanadium-containing steel slag=4:1 (mass), vanadium-containing steel slag contains V 2 o 5 3.6wt%; heated to 250°C, the pressure inside the kettle was 2.4MPa, and reacted for 4h to obtain NaOH, Na 3 VO 4 、Na 2 SiO 4 The reaction slurry mixed with the solution of etc. and calcium-rich tailings;

[0028] (2) Dilution: The reaction slurry is diluted with a diluent until the concentration of sodium hydroxide is 200g / L to obtain a mixed slurry containing iron-rich tailings, sodium hydroxide, and sodium vanadate; the diluent uses the previous process step ( 3) Obtain washing liquid;

[0029] (3) Solid-liquid separation: filter and separate the mixed slurry a...

Embodiment 2

[0033] Embodiment 2: This method for recovering vanadium from vanadium-containing steel slag adopts the following process steps.

[0034](1) Reaction: In the autoclave, add vanadium-containing steel slag and 40wt% NaOH solution; wherein, sodium hydroxide solution: vanadium-containing steel slag=5:1 (mass), vanadium-containing steel slag contains V 2 o 5 4.6wt%; heated to 230°C, the pressure inside the kettle was 1.6MPa, and reacted for 3 hours to obtain a reaction slurry;

[0035] (2) Dilution: The reaction slurry is diluted with a diluent until the concentration of sodium hydroxide is 250g / L to obtain a mixed slurry; the diluent uses the previous process step (3) to obtain a washing liquid;

[0036] (3) Solid-liquid separation: filter and separate the mixed slurry at 100°C to obtain eluate and calcium-rich tailings; the calcium-rich tailings are subjected to multi-stage countercurrent washing with water, and the obtained washing liquid is used in the next process Dilution ...

Embodiment 3

[0040] Embodiment 3: This method for recovering vanadium from vanadium-containing steel slag adopts the following process steps.

[0041] (1) Reaction: In the autoclave, add vanadium-containing steel slag and 50wt% NaOH solution; wherein, sodium hydroxide solution: vanadium-containing steel slag=4:1 (mass), vanadium-containing steel slag contains V 2 o 5 4.5wt%; heated to 200°C, the pressure inside the kettle was 0.4MPa, reacted for 2h, and finally obtained the reaction slurry;

[0042] (2) Dilution: the reaction slurry is diluted with a diluent until the concentration of sodium hydroxide is 350g / L to obtain a mixed slurry; the diluent is obtained from the washing solution in step (3) of the previous process;

[0043] (3) Solid-liquid separation: filter and separate the mixed slurry at 110°C to obtain eluate and calcium-rich tailings; the calcium-rich tailings are washed in multi-stage countercurrent with clean water, and the obtained washing liquid is used in the next step ...

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Abstract

The invention discloses a method for recycling vanadium from vanadium-containing steel slag, which comprises the following steps, (1) reaction: the vanadium-containing steel slag is reacted in NaOH solution with the mass concentration being 10%-50%, and reaction slurry is obtained; the mass ratio of the NaOH solution to the steel slag is (3:1)-(10:1), the reaction temperature is 180 DEG C to 350 DEG C, the reaction time is 0.5-10h, and the reaction pressure is 0.3-12MPa; (2) dilution: the reaction slurry is diluted through a diluent so as to enable the concentration of sodium hydroxide in the slurry to be 100-400g/L, and mixed slurry is obtained; (3) solid-liquid separation: solid-liquid separation is carried out to the mixed slurry, and calcium-rich tailings and dissolved-out liquid are obtained; (4) impurity removal: a desiliconization agent is added into the dissolved-out liquid to perform impurity removal, then solid-liquid separation is performed, and impurity-removed liquid and silicon-containing slag are obtained; and (5) crystallizing: the impurity-removed liquid is cooled and crystallized, and a sodium vanadate product is obtained. The method effectively reduces production cost of vanadium, and the vanadium leaching rate can be 99%.

Description

technical field [0001] The invention belongs to the field of vanadium-containing chromium slag hydrometallurgy and vanadium chemical industry, in particular to a method for recovering vanadium from 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 the 2% to 10% steel slag (compared with vanadium slag, its calcium content is larger), there are two ways to produce it. One is that the vanadium remaining in the semi-steel is oxidized into the slag after steelmaking, and the other is that 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 CaO and iron content, perfect crystallization, dense texture, and poor dissociation degree; (2) complex composition and large fluctuation;...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/12C22B34/22
CPCY02P10/20
Inventor 李兰杰白瑞国
Owner HEBEI IRON AND STEEL
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