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Method for carrying out two-stage countercurrent leaching on chromium-containing vanadium slag and extracting vanadium and chromium in separating manner

A countercurrent leaching and vanadium slag technology, applied in the direction of improving process efficiency, etc., can solve problems such as waste of resources, equipment corrosion, and ineffective use of iron resources, and achieve the effect of low energy consumption

Active Publication Date: 2016-06-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following disadvantages: the strong base under the sub-molten salt system corrodes the equipment seriously; 1. Iron resources cannot be effectively utilized, resulting in a waste of resources; vanadium slag treated with strong alkali contains sodium and potassium, which brings great difficulties to the treatment of tailings

Method used

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  • Method for carrying out two-stage countercurrent leaching on chromium-containing vanadium slag and extracting vanadium and chromium in separating manner

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The two-stage countercurrent leaching of chromium-containing vanadium slag and the method for separating and extracting vanadium and chromium in this embodiment are as follows figure 1 As shown, follow the steps below:

[0032] (1) Pretreatment: crush the chromium-containing vanadium slag, separate the solid and liquid after wet ball milling, to obtain the chromium-containing vanadium slag filter cake, the particle size of the chromium-containing vanadium slag in the filter cake is less than 200 mesh;

[0033] (2) Atmospheric leaching: the chromium-containing vanadium slag filter cake is leached at atmospheric pressure. The reaction temperature of the atmospheric leaching is 90℃, the reaction time is 10h, and the pH of the atmospheric leaching solution at the end of the reaction is controlled at 1.2. After filtration, atmospheric leaching is obtained. Slag and atmospheric leachate;

[0034] (3) Pressure leaching and selective chromium precipitation: the thickened atmospheric ...

Embodiment 2

[0040] The two-stage countercurrent leaching of chromium-containing vanadium slag and the method for separating and extracting vanadium and chromium in this embodiment are as follows figure 1 As shown, follow the steps below:

[0041] (1) Pretreatment: crush the chromium-containing vanadium slag, separate the solid and liquid after wet ball milling, to obtain the chromium-containing vanadium slag filter cake, the particle size of the chromium-containing vanadium slag in the filter cake is less than 200 mesh;

[0042] (2) Atmospheric leaching: the chromium-containing vanadium slag filter cake is leached at atmospheric pressure. The reaction temperature of atmospheric leaching is 95℃, the reaction time is 8h, and the pH of the atmospheric leaching solution at the end of the reaction is controlled at 1.5. After filtration, atmospheric leaching is obtained. Slag and atmospheric leachate;

[0043] (3) Pressure leaching and selective chromium precipitation: the thickened atmospheric leach...

Embodiment 3

[0049] The method for the two-stage countercurrent leaching and separation and extraction of chromium-containing vanadium slag in this embodiment is as follows figure 1 As shown, follow the steps below:

[0050] (1) Pretreatment: crush the chromium-containing vanadium slag, separate the solid and liquid after wet ball milling, to obtain the chromium-containing vanadium slag filter cake, the particle size of the chromium-containing vanadium slag in the filter cake is less than 200 mesh;

[0051] (2) Atmospheric pressure leaching: the chromium-containing vanadium slag filter cake is leached at atmospheric pressure. The reaction temperature of atmospheric leaching is 25℃, the reaction time is 2h, and the pH of the atmospheric leaching solution at the end of the reaction is controlled at 1.8. After filtration, atmospheric pressure is obtained. Leaching residue and atmospheric leachate;

[0052] (3) Pressure leaching and selective chromium precipitation: the thickened atmospheric leachin...

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Abstract

The invention belongs to the technical field of wet metallurgy, and particularly relates to a method for carrying out two-stage countercurrent leaching on chromium-containing vanadium slag and extracting vanadium and chromium in a separating manner. The method comprises the following steps: carrying out atmospheric pressure leaching on the chromium-containing vanadium slag at first; leaching under pressure and selectively carrying out chromium depositing; then preparing basic chromium sulfate and V2O5; after removing manganese, iron, aluminum and impurities from waste liquid generated in the process by oxidation, carrying out evaporative crystallization on part of an obtained solution to obtain sodium sulfate; and returning the other part of the obtained solution as a circulating leaching liquid to the atmospheric pressure leaching procedure. A step-by-step extracting path of extracting chromium at first and then extracting vanadium is adopted, in the chromium extracting process, the vanadium is hardly extracted, vanadium and chromium separation rate is greater than 99%, finally, vanadium and chromium resource utilization rate is increased, the leaching rate of the vanadium is greater than 95%, and the leaching rate of the chromium is greater than 92%.

Description

Technical field [0001] The invention belongs to the technical field of hydrometallurgy, and specifically relates to a method for two-stage countercurrent leaching and separation and extraction of chromium-containing vanadium slag. Background technique [0002] Vanadium and chromium are national strategic resources and important material guarantees for national economic development and national security. Our country uses vanadium slag as the main raw material for vanadium extraction. Vanadium-titanium magnetite is reduced in a blast furnace. The vanadium-containing minerals are reduced to zero valence [V] into the molten iron, and then blown into the molten iron in the converter Air or oxygen will oxidize zero valence [V] to V 2 O 5 , Get V 2 O 5 10%-25% vanadium slag. The composition of vanadium slag varies greatly according to the different producing areas of vanadium-titanium magnetite. Ordinary vanadium slag contains V5-20%, Cr0.5-3%, TFe25-40%, Si10-20%; vanadium-titanium in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/32C22B34/22
CPCC22B7/007C22B7/04C22B34/22C22B34/32Y02P10/20
Inventor 薛向欣王成彦于洪浩
Owner NORTHEASTERN UNIV
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