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Method for recycling vanadium and chromium from vanadium-containing chromium mud

A vanadium chromium content technology, applied in chemical instruments and methods, chromate/dichromate, vanadium compounds, etc., can solve problems affecting product purity and low purity, achieve resource utilization, simple operation, low cost effect

Active Publication Date: 2019-12-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not remove the ammonium ion, which will decompose and generate gas during high temperature and high pressure treatment, or remain in the solution to affect the purity of the product
[0004] CN 102642970A discloses a method for resource utilization of vanadium-extracting high-salt wastewater from vanadium slag. The method first adds alkaline substances to remove metal impurity ions to obtain clarified wastewater, then adjusts the pH value to 10-12, then raises the temperature to remove ammonia, ammonia gas Absorbed to prepare ammonium salts, deaminated wastewater evaporates and concentrates, then cools and crystallizes to obtain sodium salts and cooling water. In this method, only impurity ions are removed, but chromium that can be dissolved with vanadium is not separated, and the obtained sodium salts are not Single salt, low purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Present embodiment provides a kind of method that vanadium and chromium are recovered from vanadium-containing chrome mud, and described method comprises the following steps:

[0052] (1) be that the NaOH solution of 50wt% is mixed with vanadium-containing chromium mud and mass concentration, wherein in the vanadium-containing chromium mud, chromium content is 22.16wt%, and vanadium content is 2.63wt%, and water content is 50wt%, NaOH solution and vanadium-containing The mass ratio of the chrome sludge is 6:1, and then the deammonization treatment is carried out at a stirring rate of 300r / min and 80°C for 1.2h, and the released ammonia gas is absorbed with 10wt% sulfuric acid, and the obtained ammonium sulfate is used for the vanadium extraction process. Vanadium sinking process;

[0053] (2) Put the material after the deamination treatment in step (1) in the reactor for reaction leaching. The temperature of reaction leaching is 180°C, the pressure is 7MPa, and the time...

Embodiment 2

[0057] Present embodiment provides a kind of method that vanadium and chromium are recovered from vanadium-containing chrome mud, and described method comprises the following steps:

[0058] (1) be that the NaOH solution of 45wt% is mixed with vanadium-containing chromium mud and mass concentration, wherein in the vanadium-containing chromium mud, chromium content is 24.44wt%, and vanadium content is 2.92wt%, and water content is 40wt%, NaOH solution and vanadium-containing The mass ratio of the chrome sludge is 7:1, and then the deammonization treatment is performed at a stirring rate of 400r / min and 85°C for 1 hour, and the released ammonia gas is absorbed with 5wt% sulfuric acid, and the obtained ammonium sulfate is used for precipitation in the vanadium extraction process. Vanadium process;

[0059] (2) Put the material after the deamination treatment in step (1) in the reaction kettle for reaction leaching, the temperature of reaction leaching is 170°C, the pressure is 6....

Embodiment 3

[0063] Present embodiment provides a kind of method that vanadium and chromium are recovered from vanadium-containing chrome mud, and described method comprises the following steps:

[0064] (1) be that the NaOH solution of 40wt% is mixed with vanadium-containing chromium mud and mass concentration, wherein in the vanadium-containing chromium mud, chromium content is 20.26wt%, and vanadium content is 2.87wt%, and water content is 45wt%, NaOH solution and vanadium-containing The mass ratio of the chrome sludge is 8:1, and then the deammonization treatment is performed at a stirring rate of 250r / min and 90°C for 0.8h, and the released ammonia is absorbed with 8wt% sulfuric acid, and the obtained ammonium sulfate is used for the vanadium extraction process. Vanadium sinking process;

[0065] (2) Put the material after the deamination treatment in step (1) in the reaction kettle for reaction leaching. The temperature of the reaction leaching is 160°C, the pressure is 7.5MPa, and t...

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Abstract

The invention provides a method for recycling vanadium and chromium from vanadium-containing chromium mud. The method comprises the following steps: performing deamination treatment after mixing the vanadium-containing chromium mud with alkaline liquor, performing reaction leaching and solid-liquid separation to obtain vanadium-containing chromium leach liquor and leach residues; and crystallizingthe obtained vanadium-containing chromium leach liquor to obtain chromate crystals and vanadate crystals. Valuable metallic elements in vanadium-containing chromium waste are sufficiently recycled byperforming deamination treatment after mixing the vanadium-containing chromium mud with alkaline liquor, and leaching and crystallizing, wherein a vanadium leaching rate is 77% or higher, and a chromium leaching rate is 93% or higher, and the obtained crystallized product tis higher in purity. The method is simple in operation, is relatively low in cost, is clean and environmentally friendly, andis suitable for recycling various vanadium-containing chromium wastes.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization and relates to a method for recovering vanadium and chromium from vanadium-containing chrome mud. Background technique [0002] Vanadium-titanium magnetite is an important co-associated ore, in which iron, titanium, vanadium and chromium are important strategic metals, which can be widely used in national defense, chemical industry, metallurgy and other fields. Due to the similar physical and chemical properties of vanadium and chromium, it is often difficult to separate them during the extraction process. For example, during the production of vanadium products, vanadium-chromium-containing sludge is usually left when the waste water is disposed of. Its main components include V 2 o 5 , Cr(OH) 3 , CaO, Na 2 O and Fe 2 o 3 Etc., generally adopted, elements such as vanadium and chromium need to be recycled for this purpose. At the same time, the long-term storage of trivalent ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B34/32C22B7/00C22B1/00C01G37/14C01G31/00
CPCC22B34/22C22B34/32C22B7/006C22B1/005C01G37/14C01G31/00Y02P10/20
Inventor 王新东李兰杰郑天新高明磊周冰晶李男王海旭
Owner HEBEI IRON AND STEEL
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