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Method for recovering vanadium and chromium from vanadium and chromium-containing slag

A vanadium-chromium slag, vanadium-chromium technology, applied in the direction of improving process efficiency, can solve the problems of high energy consumption required for evaporation and concentration of circulating media, unrecycled chromium, loss of valuable elements, etc. Effects of medium purification, high vanadium and chromium extraction efficiency, and improved flow properties

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

AI Technical Summary

Problems solved by technology

The advantage of this method is that the vanadium leaching rate is high, the total amount of vanadium in the final slag is less than 0.1wt% (calculated as vanadium pentoxide), and the reaction process is at normal pressure; the disadvantage is that the reaction medium has a high alkali concentration, and the evaporation and concentration of the circulating medium Higher energy consumption, resulting in higher production costs
And the final slag after vanadium extraction by this method contains 2-6% Cr 2 o 3 , resulting in this part of the chromium not being recycled
This not only leads to the loss of valuable elements, but also causes environmental pollution

Method used

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  • Method for recovering vanadium and chromium from vanadium and chromium-containing slag
  • Method for recovering vanadium and chromium from vanadium and chromium-containing slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: figure 1 As shown, the method for reclaiming vanadium-chromium from vanadium-chromium-containing slag adopts the following process steps.

[0030] (1) Ingredients: In the autoclave, add the secondary slag (the primary water leaching slag after the vanadium slag is roasted by sodium hydroxide) and 30wt% NaOH solution, wherein the secondary slag contains V 2 o 5 2.3wt%, Cr 2 o 3 4.41wt%, sodium hydroxide solution: vanadium-containing chromium slag=4:1 (quality);

[0031] (2) Reaction (ie figure 1 Oxidative dissolution in the process): heat the material prepared in step (1) to 250°C, then pass oxygen into it, and stir to make the secondary slag fully contact with oxygen, control the total pressure of the system to 3MPa, and keep the temperature for 3h. Get NaOH, Na 3 VO 4 、Na 2 CrO 4 、Na 2 SiO 4 and other solutions and reaction slurry of iron-rich tailings;

[0032](3) Dilution: Add a diluent to the reaction slurry to dilute to a NaOH concentration...

Embodiment 2

[0038] Embodiment 2: The method for recovering vanadium-chromium from vanadium-chromium-containing slag adopts the following process steps.

[0039] (1) Ingredients: In the autoclave, add the vanadium slag roasting clinker and 20wt% NaOH solution, wherein the vanadium slag contains V 2 o 5 11.3wt%, Cr 2 o 3 3.61wt%, sodium hydroxide solution: vanadium-containing chromium slag=6:1 (quality);

[0040] (2) Reaction: Heat the material prepared in step (1) to 280°C, then introduce air into it, and stir to make the roasted clinker containing vanadium slag fully contact with air. The total pressure of the control system is 4MPa, and the heat preservation reaction is 5h , to obtain a reaction slurry;

[0041] (3) Dilution: adding water to the reaction slurry to dilute to a NaOH concentration of 220g / L to obtain a mixed slurry;

[0042] (4) Filtration and separation: the mixed slurry is filtered and separated at 100°C to obtain iron-rich tailings and eluate;

[0043] (5) Elimin...

Embodiment 3

[0047] Embodiment 3: The method for recovering vanadium-chromium from vanadium-chromium-containing slag adopts the following process steps.

[0048] (1) Ingredients: In the autoclave, add vanadium extraction tailings and 40wt% NaOH solution, wherein the vanadium slag contains V 2 o 5 1.3wt%, Cr 2 o 3 3.51wt%, sodium hydroxide solution: vanadium-containing chromium slag=5:1 (quality);

[0049] (2) Reaction: Heat the material prepared in step (1) to 300°C, then pass oxygen-enriched air into it, and stir to make the roasted clinker containing vanadium slag fully contact with oxygen-enriched air, and the total pressure of the control system is 2MPa , heat preservation reaction 1h, obtain reaction slurry;

[0050] (3) Dilution: adding water to the reaction slurry to dilute to a NaOH concentration of 300g / L to obtain a mixed slurry;

[0051] (4) Filtration and separation: the mixed slurry is filtered and separated at 130°C to obtain iron-rich tailings and eluate;

[0052] (5...

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Abstract

The invention discloses a method for recovering vanadium and chromium from vanadium and chromium-containing slag, which comprises the following processing steps of: (1) reaction: enabling the vanadium and chromium-containing slag to have a heating oxidation reaction with oxidizing gas in NaOH solution with the mass concentration of 10-60%, and obtaining reactant slurry; (2) dilution: using diluent to dilute the reactant slurry until the concentration of sodium hydroxide of the slurry is 100-350g / L, and obtaining mixed slurry; (3) filtering separation: carrying out filtering separation on the mixed slurry at the temperature of 80-130 DEG C, and obtaining iron-rich tailings and eluate; (4) impurity removal: adding desiliconization agent into the eluate for removing impurities, then carrying out solid-liquid separation, and obtaining liquid subjected to impurity removal and silicon-containing residue; (5) sodium vanadate crystallization: cooling and crystallizing the liquid subjected to impurity removal, and obtaining sodium vanadate and crystallized liquid; and (6) sodium chromate crystallization: evaporating and crystallizing the crystallized liquid, and obtaining sodium chromate. According to the method, the leaching rate of vanadium and chromium reaches 99%, and the final slag contains less than 0.1wt% of vanadium and chromium, so that the method has the characteristics of being low in vanadium and chromium content of the tailings and high in extraction efficiency of vanadium and chromium.

Description

technical field [0001] The invention belongs to the fields of vanadium-chromium-containing slag hydrometallurgy and vanadium chemical industry, in particular to a method for recovering vanadium-chromium from vanadium-chromium-containing slag. Background technique [0002] Vanadium chromium is an important rare metal, because it exhibits many important properties, making vanadium chromium an important additive in modern industry. There are nearly 30 kinds of chromium-containing minerals found in nature, but most of them contain low chromium content, scattered distribution, and low industrial utilization value. Only chromite has mining value, and the crystal structure of chromite is cubic Spinel type. The production processes of chromium salts in my country include: there is a calcium roasting process, but the problem of resources and environment is prominent, the amount of slag is large, the slag is highly toxic, and the three wastes are seriously polluted, the reaction temp...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22C22B34/32
CPCY02P10/20
Inventor 李兰杰陈东辉杜浩
Owner HEBEI IRON AND STEEL
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