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Method for wet-process vanadium extraction by using vanadium- and titanium-containing converter slag

A technology for converter slag and vanadium-titanium slag, which is applied in the field of vanadium-containing titanium converter slag treatment, can solve the problems of strong corrosion, high equipment material requirements, unfavorable continuous production, etc., and achieve low equipment requirements, environmental friendliness, and realization The effect of effective separation

Active Publication Date: 2011-02-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest problem with the above-mentioned patented technology is that it uses fluorite to react with vanadium and sulfuric acid to generate hydrofluoric acid, which is more corrosive and requires high equipment materials, which is not conducive to large-scale continuous production.

Method used

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  • Method for wet-process vanadium extraction by using vanadium- and titanium-containing converter slag
  • Method for wet-process vanadium extraction by using vanadium- and titanium-containing converter slag
  • Method for wet-process vanadium extraction by using vanadium- and titanium-containing converter slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The process steps of the wet vanadium extraction method using vanadium-containing titanium converter slag (the main component is 1# in Table 2) are as follows:

[0041] (1) Direct acid leaching

[0042] The vanadium-titanium slag is crushed and ball-milled to 150 μm, and then directly leached with 20% sulfuric acid in an autoclave without adding an oxidant, so that vanadium enters the leaching solution in the form of vanadyl sulfate, and titanium is enriched in the leaching slag. The leaching process conditions are: the volume of sulfuric acid: the mass of vanadium-titanium slag, the ratio of sulfuric acid to vanadium-titanium slag is 20:1, the leaching temperature is 120°C, the leaching time is 150min, and the stirring speed is 500rpm. Liquid-solid separation is carried out after leaching to obtain vanadyl sulfate-containing leaching solution and titanium-enriched leaching residue.

[0043] (2) Purification and separation of vanadium-containing leachate

[0044] Add ...

Embodiment 2

[0054] The process steps of the wet vanadium extraction method using vanadium-containing titanium converter slag (the main component is 1# in Table 2) are as follows:

[0055] (1) Direct acid leaching

[0056] The vanadium-titanium slag is crushed and ball-milled to 250 μm, and then directly leached with sulfuric acid with a mass concentration of 30% in the autoclave without adding an oxidant, so that vanadium enters the leaching solution in the form of vanadyl sulfate, and titanium is enriched in the leaching residue. The leaching process conditions are: according to the volume of sulfuric acid: the mass of vanadium-titanium slag, the ratio of sulfuric acid to vanadium-titanium slag is 2:1, the leaching temperature is 200°C, the leaching time is 30min, and the stirring speed is 1000rpm. Liquid-solid separation is carried out after leaching to obtain vanadyl sulfate-containing leaching solution and titanium-enriched leaching residue.

[0057] (2) Purification and separation o...

Embodiment 3

[0067] The process steps of the wet vanadium extraction method using vanadium-containing titanium converter slag (the main component is 2# in Table 2) are as follows:

[0068] (1) Direct acid leaching

[0069] The vanadium-titanium slag is crushed and ball-milled to 38 μm, and then directly leached with sulfuric acid with a mass concentration of 5% in the autoclave without adding an oxidant, so that vanadium enters the leaching solution in the form of vanadyl sulfate, and titanium is enriched in the leaching residue. The leaching process conditions are: sulfuric acid volume: mass of vanadium-titanium slag, the ratio of sulfuric acid to vanadium-titanium slag is 40:1, the leaching temperature is 50°C, the leaching time is 300min, and the stirring speed is 50rpm. Liquid-solid separation is carried out after leaching to obtain vanadyl sulfate-containing leaching solution and titanium-enriched leaching residue.

[0070] (2) Purification and separation of vanadium-containing leach...

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Abstract

The invention discloses a method for wet-process vanadium extraction by using vanadium- and titanium-containing converter slag, which comprises: performing acid leaching directly by using 5 to 30 mass percent sulfuric acid; adding NaClO into the leachate to perform oxidization treatment, performing ion exchange purification and separation by using alkalescent anion exchange resin which is transformed by sulfuric acid, and desorbing by using NaOH; adding ammonium chloride into stripping liquid to precipitate vanadium, filtering and calcining ammonium metavanadate filter cake to obtain powdered vanadium pentoxide; and processing titanium-enriched leaching residue to obtain titanium dioxide. In the invention, the direct leaching of converter vanadium-titanium slag is realized, process flow in shortened, the pollution caused by adding oxidant is avoided, and due to the use of the low-concentration sulfuric acid, the material consumption and the requirements on the corrosion resistance of equipment are reduced at the same time. The method realizes the comprehensive recovery and utilization of all valuable elements, belongs to a novel all wet-process smelting technique, and avoids waste discharge in a whole process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and solid waste treatment, and relates to the treatment technology of vanadium-titanium converter slag. Background technique [0002] my country has rich reserves of vanadium-titanium magnetite resources, among which vanadium (V 2 o 5 ) 14.75 million t, titanium (TiO 2 ) 593 million tons, accounting for 87% and 94% of the national vanadium and titanium reserves respectively. Vanadium-containing molten iron is smelted in an LD converter and oxidized in an oxidative atmosphere to obtain vanadium-containing titanium converter slag, which is currently the main raw material for vanadium extraction. The vanadium content in the slag is 1.8%~10.2% (calculated as vanadium pentoxide), and the titanium content is 5.5% to 18.2% (calculated as titanium dioxide). A large amount of converter slag accumulates after production. At present, there are no economical, effective and low-energy methods that can b...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 张廷安牟望重豆志河吕国志刘燕赵秋月赫冀成
Owner NORTHEASTERN UNIV
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