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Method for separating and recycling vanadium and chromium from vanadium and chromium-containing material

A technology for separation and recovery of materials, applied in the field of metallurgy, can solve the problems of high cost, complex process, complicated operation, etc., and achieve the effects of low production cost, good separation effect and short process flow

Inactive Publication Date: 2015-03-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quaternary amine or primary-secondary compound amine extraction method can realize the separation of vanadium and chromium in the solution, but the cost of extraction and separation of vanadium and chromium is high, and the process conditions are difficult to control
Chinese patent CN101538652B uses macroporous strong basic resin D201 to separate vanadium and chromium in the green mud leach solution, but the separation of vanadium and chromium is not complete
The whole process requires both oxidative vanadium-containing chromate solution and reductive vanadium-containing chromate solution. The process is long and the operation is complicated, and only qualified products of vanadium can be recovered, and chromium is still obtained in the form of chromium slag. Form recovery, the efficiency of separation and recovery of vanadium and chromium is low
Chinese patent ZL 201210160816.1 uses weak base and strong base anion exchange resins for the difference in anion exchange potential formed by hexavalent chromium and pentavalent vanadium in aqueous solution, realizes the separation of vanadium and chromium through saturated adsorption, and directly obtains the products of vanadium and chromium, But the process is complicated, and the aqueous solution containing hexavalent chromium and pentavalent vanadium will cause great damage to the resin, seriously affecting the service life of the resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Get 200g of green mud formed in the purification process of vanadium slag extracting vanadium wastewater, add sulfuric acid according to 1.5 times of the stoichiometric amount of chromium sulfate and vanadyl sulfate formed by vanadium and chromium respectively, and oxidize tetravalent vanadium into pentavalent vanadium according to the chemical reaction Add potassium dichromate as an oxidizing agent to 1.5 times the measured quantity, mix well, and mature at 120°C for 2.5h. Add water to the matured material at a solid-to-liquid ratio of 1:1.5g / mL, soak at room temperature for 4 hours, stir and add ammonia water to adjust the pH to 2.5, react at 90°C for 1.5 hours, and filter to obtain filtrate and filter residue. The resulting filtrate was neutralized with sodium hydroxide to a pH of 6.2, and the supernatant and bottom sludge were obtained by standing still. The pH of the bottom sludge was adjusted to 13.2 by adding NaOH, stirred at 65°C for 1 hour, filtered to obtain hyd...

Embodiment 2

[0036] Get 100g of the vanadium-chromium concentrate obtained after reducing and removing iron from the high-chromium vanadium slag, add sulfuric acid by 1 times of the stoichiometric number of chromium sulfate and vanadyl sulfate formed by vanadium and chromium respectively, and add the Cr-containing compound obtained in Example 1. The washing solution of (VI) is used as an oxidizing agent, and simultaneously forms (NH 4 ) 2 V 6 o 12 Add ammonium sulfate twice the stoichiometric number, add water, mix well, and roast at low temperature at 210°C for 2h. The obtained calcined sand was stirred with water at a solid-to-liquid ratio of 1:2 g / mL, and NaOH was added to adjust the pH to 3.2, reacted at 80°C for 2.5 hours, and filtered to obtain filtrate and filter residue. The resulting filtrate was neutralized with ammonia water until the pH was 7.8, filtered to obtain hydrated chromium oxide, dried at 110°C, crushed and ground to obtain chromium oxide containing Cr 2 o 3 A 37....

Embodiment 3

[0038] Get the vanadium-chromium-titanium slag 5000g that high-chromium type vanadium-titanium magnetite concentrate reduces and removes iron and obtains, according to wherein vanadium and chromium respectively form 2 times of the stoichiometric number of chromium sulfate and vanadyl sulfate, add the sulfuric acid of 1:1, and press wherein Low-valent vanadium is oxidized to 5 times the stoichiometric number of pentavalent vanadium. Add sodium dichromate as an oxidant, and at the same time form pentavalent vanadium (NH 4 ) 2 V 6 o 12 Add ammonium sulfate to 6 times the stoichiometric number, mix well, and roast at a low temperature of 240°C for 1.5h. The obtained calcined sand is stirred with water according to the solid-to-liquid ratio of 1:2.5g / mL, and NaHCO is added 3 Adjust the pH to 2.5, react at 100°C for 1 hour, and filter to obtain the filtrate and filter residue. Add sodium carbonate to the resulting filtrate to neutralize to pH 6.9, filter to obtain hydrated chrom...

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PUM

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Abstract

The invention discloses a method for separating and recycling vanadium and chromium from a vanadium and chromium-containing material. The method comprises the following steps of performing selective oxidization reaction on the vanadium-containing material to oxidize low-valent vanadium in the vanadium-containing material into pentavalent vanadium, filtering and separating to obtain a chromium-containing solution and vanadium-containing enriched slag by adopting water leaching after oxidization is completed; regulating the pH of the chromium-containing solution to be naturalized to separate out chromium oxide hydrate precipitates, filtering and separating the chromium oxide hydrate precipitates to obtain chromium oxide hydrate, and further processing the chromium oxide hydrate obtained by filtering and separating to prepare chromium-series products; leaching the vanadium-containing enriched slag by an alkaline solution to obtain a vanadate solution; purifying the vanadate solution and removing impurities from the vanadate solution, then, precipitating and separating out ammonium metavanadate or ammonium polyorthovanadate in the presence of ammonium salts, and roasting the ammonium metavanadate or ammonium polyorthovanadate to obtain a vanadium pentoxide product. The method for separating and recycling vanadium and chromium from the vanadium-containing material is good in separating effects of vanadium and chromium and high in recovery rate. The vanadium product and the chromium product prepared are high in purity. Moreover, the method has the advantages of short process flow, simple and convenient operation, low production cost, environment friendliness and the like, and is suitable for industrial application.

Description

technical field [0001] The invention relates to a method for separating and recovering vanadium and chromium from materials containing vanadium and chromium, belonging to the field of metallurgy. Background technique [0002] Vanadium and chromium compounds are important chemical raw materials, they are widely used in metallurgy and chemical industry. Vanadium and chromium belong to the transition elements of the fourth period, and have similar properties. In nature, vanadium and chromium usually exist in minerals in a symbiotic manner. The vanadium-titanium magnetite mined in my country's Panzhihua, Xichang, Chengde and other regions is a typical representative of this type of mine. Therefore, during the mining and processing of vanadium-titanium magnetite, a variety of materials containing vanadium and chromium will be produced, such as the vanadium-chromium-titanium slag obtained by reducing and removing iron from high-chromium vanadium-titanium magnetite concentrate, an...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/32
CPCY02P10/20
Inventor 王学文王华光高大雄王明玉
Owner CENT SOUTH UNIV
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