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Method for chrome and vanadium separating and recovery

A technology for separation and recovery of vanadium and chromium, applied in the chemical industry, can solve the problems of low recovery rate of vanadium and chromium and low quality of chromium products, and achieve the effect of simple and easy-to-understand process, low cost and few process steps

Active Publication Date: 2017-07-28
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN102534266 discloses a method for extracting and separating vanadium-chromium in a three-phase system, adding a phase-forming salt and a polymer to the vanadium-chromium solution to form a two-phase system, and then adding an organic phase to the two-phase system, shaking, Phase separation to obtain a three-phase system, which can realize the separation of vanadium and chromium in one step, but the recovery rate of vanadium and chromium is not high
The process is simple, the cost is low, and the waste water can be recycled, but the quality of the obtained chromium product is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Get 200mL of vanadium chromium solution (wherein V=18.58g / L, Cr=12.41g / L, pH=7.89), add precipitating agent barium chloride, the addition amount is raw vanadate and barium chromate required total theoretical amount 1.1 times, react at 90°C for 1 hour, filter to obtain a vanadium-chromium precipitate.

[0038] The precipitate was washed with 200 mL of 30% sodium hydroxide solution and filtered to obtain a vanadium-containing filtrate and a barium chromate precipitate. Add sulfuric acid to the vanadium-containing filtrate to adjust the pH to 2.0, then add ammonium sulfate at a mass ratio of ammonium sulfate to V of 1.6:1, and then stir and react at 95°C for 2 hours to obtain ammonium polyvanadate precipitate, which is filtered, dried, and heated at 550°C After calcination for 1 hour, a vanadium pentoxide product with a purity of 99.5% was obtained.

[0039] The barium chromate precipitate was reacted with dilute hydrochloric acid with a solid-to-liquid ratio of 1:2, stir...

Embodiment 2

[0042] Get 300mL of vanadium chromium solution (wherein V=18.58g / L, Cr=12.41g / L, pH=7.89), add precipitating agent barium chloride, the addition amount is raw vanadate and barium chromate required total theoretical amount 1.5 times, react at 25°C for 3h. Filtration to obtain a vanadium chromium precipitate.

[0043] The precipitate was washed with 400 mL of 30% sodium hydroxide solution and filtered to obtain a vanadium-containing filtrate and a barium chromate precipitate. Add sulfuric acid to the vanadium-containing filtrate to adjust the pH to 2.0, then add ammonium sulfate at a mass ratio of ammonium sulfate to V of 1.6:1, and then stir and react at 95°C for 2 hours to obtain ammonium polyvanadate precipitate, which is filtered, dried, and heated at 550°C After calcination for 1 hour, a vanadium pentoxide product with a purity of 98.2% was obtained.

[0044] The barium chromate precipitate was reacted with dilute hydrochloric acid with a solid-to-liquid ratio of 1:2, sti...

Embodiment 3

[0047]Get 400mL of vanadium-chromium solution (wherein V=18.58g / L, Cr=12.41g / L, pH=7.89), add precipitating agent calcium chloride, the addition amount is raw calcium vanadate and the required theoretical amount of calcium chromate total amount 1.8 times, react at 90°C for 1h. Filtration to obtain a vanadium chromium precipitate.

[0048] The precipitate was washed with 500 mL of a 30% sodium hydroxide solution and filtered to obtain a vanadium-containing filtrate and a calcium chromate precipitate. Add sulfuric acid to the vanadium-containing filtrate to adjust the pH to 1.8, then add ammonium sulfate at a mass ratio of ammonium sulfate to V of 1.8:1, and then stir and react at 95°C for 2 hours to obtain ammonium polyvanadate precipitate, which is filtered, dried, and heated at 550°C After calcination for 1 hour, a vanadium pentoxide product with a purity of 99.1% was obtained.

[0049] Calcium chromate precipitate reacts with dilute hydrochloric acid with a solid-to-liquid...

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Abstract

The invention belongs to the field of chemical engineering and particularly relates to a method for chrome and vanadium separating and recovery. The method for chrome and vanadium separating and recovery comprises the following steps that (A) precipitation is conducted, specifically, a precipitation reagent is added into a solution containing chrome and vanadium, and a chrome and vanadium precipitate is obtained after solid-liquid separation; (B) vanadium extraction is conducted, specifically, alkali liquid is added into the chrome and vanadium precipitate, and vanadium-containing liquid and chrome-containing solid are obtained after solid-liquid separation, an enough amount of ammonium salt is added into the vanadium-containing liquid, ammonium poly-vanadate precipitate is obtained, and a V2O5 product is obtained after the ammonium poly-vanadate precipitate is dried and roasted; and (C) chrome extraction is conducted, specifically, the chrome-containing solid is added into acid liquid, chrome-containing liquid is obtained through solid-liquid separation after stirring reaction, an enough amount of a reducing agent is added into the chrome-containing liquid, chrome reducing liquid is obtained after stirring reaction, then alkali liquid is added to adjust pH till the liquid is alkaline, chromic hydroxide precipitate is obtained, and a Cr2O3 product is obtained after the chromic hydroxide precipitate is dried and roasted. The method for chrome and vanadium separating recovery has the advantages of being simple and low in cost, and the yield and purity of the obtained products are high.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for separating and recovering vanadium and chromium. Background technique [0002] Vanadium and chromium are important strategic elements, which are widely used in metallurgy, chemical industry, national defense and other fields. Since the properties of vanadium and chromium are very similar, they often exist in natural minerals in the form of symbiosis, and cannot be effectively separated by physical means. However, in the process of roasting-water leaching to extract vanadium (chromium), a solution containing vanadium and chromium will be obtained. The similar chemical properties of vanadium and chromium make the separation of vanadium and chromium a difficult problem. So far, there is no economical and feasible method to separate and recover vanadium chromium from vanadium chromium solution. [0003] Chinese patent CN102534266 discloses a method for extr...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/32C22B3/44
CPCC22B3/44C22B34/22C22B34/32Y02P10/20
Inventor 王俊李千文李明蒋霖付自碧高官金殷兆迁郭继科
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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