Method for separating and recycling vanadium and chromium from chromium vanadium reducing slag

A technology for separation and recovery of vanadium and chromium, applied in the direction of improving process efficiency, etc., can solve problems such as high roasting temperature, complicated methods, and difficult industrial production

Active Publication Date: 2014-12-03
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, complicated method, difficulty in industrialized production and high roasting temperature in the method for separating vanadium-chromium reduction slag in the prior art, and provide a new simple and easy-to-industrialized production and can be used in Method for separating and recovering vanadium and chromium from vanadium-chromium reduction slag by roasting at low temperature

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0041] This example is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium reduction slag of the present invention.

[0042] 500g of vanadium chromium reduction slag (the content of vanadium element is 5.67% by weight, the content of chromium element is 23.12% by weight) and 17g of sodium chromate are roasted at 350 ℃ for 90min (open the furnace door and feed into the air); the material after roasting Water immersion with water at a weight ratio of 1:4, the temperature of the water immersion is 80°C, the time is 2h, and then the solid-liquid separation is carried out, and the obtained liquid phase is the leach solution of vanadium, wherein the concentration of vanadium is 13.73g / L, The chromium concentration is 0.2g / L, and the vanadium leaching rate is 96.86% by weight; the obtained solid phase (477g) is carried out acid leaching for 30min at 60° C. in 1520 g of pH of 2 sulfuric acid aqueous solution, and carries out solid-li...

Embodiment 2

[0044] This example is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium reduction slag of the present invention.

[0045] With 500g vanadium-chromium reduction slag (the content of vanadium element is 15% by weight, the content of chromium element is 4.5% by weight) and 37.8g sodium dichromate roasting 120min at 400 ℃ (open furnace door and feed into air); The material and water are immersed in water at a weight ratio of 1:2. The temperature of the water immersion is 85° C., and the time is 4 hours. Then, solid-liquid separation is carried out. The obtained liquid phase is the leachate of vanadium, wherein the concentration of vanadium is 72.69g / L, chromium concentration 0.11g / L, vanadium leaching rate is 96.92% by weight; Gained solid phase (439g) is carried out acid leaching 30min at 90 ℃ in the aqueous hydrochloric acid solution of 0.5 with the pH of 2000g, and carries out solid-liquid separation, The obtained liquid ...

Embodiment 3

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

[0048] With 500g vanadium-chromium reducing slag (the content of vanadium element is 1.5% by weight, the content of chromium element is 30% by weight), 4.68g sodium chromate and 5.66g sodium dichromate roasting 100min at 380 ℃ (open furnace door and pass into air); the roasted material and water are immersed in water at a weight ratio of 1:8, the temperature of the water immersion is 80° C., and the time is 3 hours, and then solid-liquid separation is carried out, and the obtained liquid phase is the leaching solution of vanadium, wherein, The vanadium concentration is 1.815g / L, the chromium concentration is 0g / L, and the vanadium leaching rate is 96.5% by weight; the obtained solid phase (496.2g) is carried out alkaline leaching at 80°C for 30min in 1620g of 3mol / L sodium hydroxide aqueous solution , and car...

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Abstract

The invention discloses a method for separating and recycling vanadium and chromium from chromium vanadium reducing slag. The method comprises the following steps that (1) the chromium vanadium reducing slag and oxidability chromium salt are roasted, wherein the roasting condition comprises the temperature of 300 DEG C to 400 DEG C and the time of 60 minutes to 240 minutes; (2) water leaching is carried out on roasted materials in the step (1), then, solid-liquid separation is carried out on the materials, and lixivium containing the vanadium is obtained; (3) acid leaching and/or alkaline leaching are/is carried out on a solid phase obtained after solid-liquid separation in the step (2), then solid-liquid separation is carried out on the solid phase, and lixivium containing the chromium is obtained. Through the method, the vanadium in the chromium vanadium reducing slag can be directly oxidized at the low roasting temperature, the vanadium can be extracted through following water leaching, the chromium is extracted through following acid leaching and/or alkaline leaching, and the vanadium and the chromium in the chromium vanadium reducing slag can be successfully separated.

Description

technical field [0001] The invention relates to a method for separating and recovering vanadium and chromium from vanadium-chromium reduction 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 propertie...

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 伍珍秀蒋霖付自碧高官金彭一村
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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