Method for separating and recovering vanadium and chromium from vanadium-chromium slag

A technology for separation and recovery of vanadium chromium slag, applied in the direction of improving process efficiency, etc., can solve the problems of few steps, many steps, and difficult separation, and achieve the effect of fewer steps, conducive to industrial production, and simple operation

Active Publication Date: 2014-11-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of many steps, difficult separation and unfavorable for industrialized production when separating and recovering vanadium and chromium from vanadium-chromium slag, and provides a kind of process with few steps, simple separation and favorable for industrialized production. Method for separating and recovering vanadium and chromium from vanadium-chromium slag

Method used

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Examples

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Embodiment 1

[0047] This embodiment is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium slag of the present invention.

[0048] With 100g vanadium-chromium slag (the content of vanadium element is 5.95% by weight, the content of chromium element is 6.05% by weight) and 15.9g sodium carbonate roasting 90min at 750 ℃; The solid ratio is 2:1) and then filtered, and the resulting filtrate is subjected to ammonium salt vanadium precipitation to obtain vanadium precipitation wastewater and a vanadium-containing precipitate with a pH of 2, and the vanadium-containing precipitate is calcined to obtain 8.5g of vanadium pentoxide product; After filter residue (110.3g, the content of water is 5% by weight), 8g sodium oxide and 9.6g sodium hydroxide calcined 2h together at 820 ℃, the product after roasting is carried out water immersion 30min (liquid-solid ratio) at 60 ℃ It is 1.8:1) and then filtered, and the obtained filtrate is poured into the...

Embodiment 2

[0050] This embodiment is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium slag of the present invention.

[0051] 100g of vanadium chromium slag (the content of vanadium element is 3% by weight, the content of chromium element is 9.8% by weight) and 30.87g sodium bicarbonate were roasted at 780°C for 60min; the product after roasting was immersed in water for 60min at 25°C ( The liquid-solid ratio is 3:1) and then filtered, and the obtained filtrate is hydrolyzed to precipitate vanadium to obtain vanadium-precipitated wastewater and a vanadium-containing precipitate with a pH of 3, and the vanadium-containing precipitate is calcined to obtain 4.82g of vanadium pentoxide product; The final filter residue (117.8g, water content is 8% by weight) and 70g sodium carbonate were calcined at 920°C for 2h together, and the product after roasting was immersed in water for 15min at 25°C (liquid-solid ratio was 1.5:1) and then Filtr...

Embodiment 3

[0053] This embodiment is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium slag of the present invention.

[0054] 100g of vanadium-chromium slag (the content of vanadium element is 9.4% by weight, and the content of chromium element is 1.7% by weight) and 24.43g of sodium carbonate are roasted at 550°C for 180min; the product after roasting is immersed in water for 40min at 100°C ( The liquid-solid ratio is 1.2:1) and then filtered, and the obtained filtrate is subjected to ammonium salt vanadium precipitation to obtain vanadium precipitation waste water and vanadium-containing precipitation with a pH of 3.5, and the vanadium-containing precipitation is calcined to obtain 12.416g of vanadium pentoxide product; the above filtration After filter residue (110.4g, the content of water is 5% by weight), 3.27g sodium hydroxide and 8.48g sodium carbonate calcined 4h together at 950 ℃, the product after roasting is carried out wa...

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Abstract

The invention discloses a method for separating and recovering vanadium and chromium from vanadium-chromium slag. The method comprises the following steps: (1) carrying out first roasting on the vanadium-chromium slag and first sodium-containing materials and carrying out solid-liquid separation after leaching the product obtained after first roasting in water, thus obtaining first solid phases and a first liquid phase; (2) carrying out solid-liquid separation after carrying out vanadium precipitation on the first liquid phase, thus obtaining second solid phases and a second liquid phase; (3) carrying out secondary roasting on the first solid phases and second sodium-containing materials and carrying out solid-liquid separation after leaching the product obtained after secondary roasting in water, thus obtaining third solid phases and a third liquid phase; (4) carrying out solid-liquid separation after contacting the second liquid phase with the third liquid phase and carrying out precipitation, thus obtaining fourth solid phases and a fourth liquid phase; (5) calcining the second solid phases and the fourth solid phases and extracting vanadium; and (6) reducing the fourth liquid phase and precipitating chromium. By the method, vanadium and chromium can be simply separated and recovered from the vanadium-chromium slag at high yield.

Description

technical field [0001] The invention relates to a method for separating and recovering vanadium and chromium from vanadium-chromium slag. Background technique [0002] Vanadium and chromium are important strategic resources, widely used in national defense, metallurgy, materials and chemical industries. However, during the production and utilization of vanadium and chromium, it is inevitable to produce pentavalent vanadium and hexavalent chromium. As we all know, pentavalent vanadium and hexavalent chromium are heavy metals, and their compounds are highly toxic, seriously endangering the environment and causing great damage to the human body. According to media reports, the incidence of cancer is significantly higher in areas with heavy metal pollution. Based on the consideration of environmental hazards, human health and added value of heavy metals, pentavalent vanadium and hexavalent chromium must be processed and recycled before discharge. Since the properties of vanad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/22C22B34/32
CPCY02P10/20
Inventor 伍珍秀高官金蒋霖肖亮汪超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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