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Method for extracting vanadium and chromium from materials containing vanadium or/and chromium

A material, vanadium-chromium technology, applied in the direction of improving process efficiency, can solve the problems of vanadium-chromium separation and recovery that there is no ideal method, vanadium extraction rate is only 90%, and chromium-containing spinel cannot be decomposed.

Inactive Publication Date: 2016-03-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the calcification roasting and acid leaching process is that it can only decompose vanadium-containing spinel, but cannot decompose chromium-containing spinel, and the extraction rate of vanadium is only about 90%.
Although the leaching rate of vanadium and chromium is high in this process, there is no ideal method for the separation and recovery of vanadium and chromium in the leach solution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take 1000g of vanadium slag with a particle size of negative 150mesh containing V11.52% and Cr1.23%, stir and add 800gNaOH, 1600gNaNO 3 and 10gNa 2 CO 3 In a melt with a temperature of 330° C., react for 2 hours, add 3000 ml of water at 80° C. and stir for leaching for 1 hour, and filter to obtain leaching residue and leaching solution containing V0.31% and Cr0.05%. The obtained leaching solution is added with calcium hydroxide according to 1.25 times of the stoichiometric number of vanadium forming calcium vanadate, stirred and ball milled at 60° C. for 1 hour, and filtered to obtain a vanadium-precipitated solution containing V0.05 g / L and a vanadium-rich solution containing Cr﹤0.1%. Collect the slag, and return the obtained vanadium-precipitated liquid to the water immersion process to continue to use; the obtained vanadium-enriched slag is added with water at a solid-to-liquid ratio of 1:4g / ml, stirred and added with 1:1 sulfuric acid, reacted at 50°C for 2 hours, ...

Embodiment 2

[0060] Take 500 g of vanadium slag with a particle size of minus 250 mesh containing V10.38% and Cr3.25%, and stir it into a melt composed of sodium nitrate, sodium hydroxide, and sodium nitrite with a melting point of 185°C at a mass ratio of 1:1.5 After reacting at 450° C. for 1 h, add the vanadium-precipitated liquid obtained in Example 1, stir and leach at 40° C. for 2.5 h, and filter to obtain leaching residue and leaching liquid containing V0.13% and Cr0.03%. Add calcium oxide to the obtained leaching solution according to 1.5 times the stoichiometric number of vanadium forming calcium vanadate, ball mill at 60°C for 1 hour, and filter to obtain vanadium-precipitated solution containing V0.02g / L and vanadium-enriched slag containing Cr﹤0.1% 1.1 times of the stoichiometric number of barium chromate formed by the chromium in the obtained vanadium-precipitated solution was then added to barium nitrate, stirred at room temperature for 0.5h, and filtered to obtain chromium-pre...

Embodiment 3

[0062] Take 1000 g of vanadium slag with a particle size of minus 320 mesh containing V8.36% and Cr5.23%, stir it into the molten salt obtained in Example 2 at a mass ratio of 1:3.5, and react at 380° C. for 1 hour, then add the slurry into 5000 ml of water, Stir and leaching at 110°C for 0.5h, filter to obtain leaching residue and leaching solution containing V0.23% and Cr0.28%; add calcium nitrate to the obtained leaching solution according to 1.1 times the stoichiometric number of vanadium forming calcium vanadate, and stir at room temperature for 1h , filtered to obtain the vanadium-precipitated liquid containing V0.01g / L and the vanadium-enriched slag containing Cr﹤0.1%; the gained vanadium-precipitated liquid is then added with barium carbonate by 1.3 times the stoichiometric number of barium chromate formed by the chromium therein, Ball mill at room temperature for 2.5 hours, and filter to obtain chromium-precipitated liquid and chromium-enriched slag containing Cr﹤0.01g...

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Abstract

A method for extracting vanadium and chromium from materials containing the vanadium or / and the chromium is characterized by comprising the following steps: taking salt and alkali of alkali metal or the alkali of the alkali metal as an oxidation transformation medium of the materials containing the vanadium or / and the chromium; carrying out treating for 0.5-6 hours at the temperature of 160-600 DEG C under the effect of an oxidizing agent and enabling the vanadium and the chromium in the materials to be converted into soluble vanadate and soluble chromate; carrying out water leaching to obtain leaching liquor containing the vanadium or / and the chromium; adding a precipitant A in the leaching liquor containing the vanadium or / and the chromium to selectively precipitate the vanadium at first, and adding a precipitant B to precipitate the chromium to obtain vanadium-rich residues and chromium-rich residues; and then separating and recycling the vanadium and the chromium from the vanadium-rich residues and the chromium-rich residues respectively. The vanadium and the chromium are separated and recycled effectively, and moreover, the effect of removing impurities simultaneously is achieved; liquor obtained after chromium precipitation is subjected to oxidization regeneration, evaporated and concentrated to obtain media, and the media are returned to an oxidation transformation procedure for the materials containing the vanadium or / and the chromium and are recycled. The method has the advantages of the simple technology, easiness and convenience in operation, the good vanadium and chromium separating effect, a high metal recovery rate, low production cost, environmental friendliness and the like, and is suitable for industrial application of extracting the vanadium and the chromium from the materials containing the vanadium or / and the chromium.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for extracting vanadium and chromium from materials containing vanadium and / or chromium. Background technique [0002] Vanadium and chromium and their compounds are important strategic materials. Vanadium and chromium are widely used in metallurgy, chemical industry, electronics and other fields. Vanadium and chromium mostly exist in the form of spinel in their smelting materials. For materials containing vanadium and / or chromium spinel, the vanadium and chromium are usually extracted by sodium roasting water leaching, calcification roasting acid leaching process and sodium hydroxide atmospheric oxidation leaching decomposition process. Sodiumized roasting and water immersion process, using sodium carbonate as the main additive, roasting at 800-1200°C for 3-5 hours, converting the vanadium and chromium into soluble vanadate and chromate, and ...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/32C22B3/44C22B3/04C22B7/00
CPCC22B3/04C22B3/44C22B7/006C22B34/22C22B34/32Y02P10/20
Inventor 王学文王明玉孟钰麒刘彪
Owner CENT SOUTH UNIV
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