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Method of extracting vanadium and removing phosphorous from phosphorous containing vanadium slag

A vanadium slag and dephosphorization technology, which is applied in the chemical industry, can solve the problems of high P and CaO content and cannot be directly produced, and achieves the effects of small vanadium loss, inhibition of hydrolysis and precipitation, and remarkable effect

Pending Publication Date: 2021-05-14
CHONGQING UNIV OF EDUCATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method also has the problem of high content of P and CaO in the obtained vanadium slag (the vanadium-containing molten iron needs to add a dephosphorization agent—calcium oxide during the process of extracting vanadium), which are generally above 0.3wt% and 10wt% respectively (belonging to high calcium high phosphorus vanadium slag), much higher than the level of existing vanadium slag
Because whether it is sodium roasting-water leaching vanadium extraction, or calcification roasting-acid leaching vanadium extraction, there are strict restrictions on the phosphorus content in the vanadium slag, requiring P≤0.05wt% in the vanadium slag, which will lead to existing Neither the sodium vanadium extraction process nor the calcification vanadium extraction process can directly produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] CaO:V 2The molar ratio of O is that the vanadium slag of 4~5 carries out calcification roasting in the temperature of 800~900 ℃ to obtain vanadium-containing material; Get the vanadium-containing material (V 2 0 5 17.85%, P0.04%) 200g, add 5.8g aluminum phosphate into 700mL water together, adjust slurry pH=0.6~0.8 with sulfuric acid at normal temperature and stir reaction 70min, solid-liquid separation, in the acid leaching residue obtained 2 0 5 The vanadium content is 0.75%, the vanadium leaching rate is 96.0%; the leachate V 5+ Concentration 27.46g / L, P concentration 2.55g / L; into the acidic leaching solution ([Si]=0.52g / L, [P]=0.83g / L, pH 2.4) with Al:Si=1.4:1 (mass ratio); add 4.61g of aluminum sulfate, Fe:P=1.0:1 (mass ratio), add 2.96g of iron sulfate, stir at a temperature of 60-80°C for 60min, add ammonium salt to adjust the pH value to 3.8, and stir for 50min. Let stand for 1h, filter, and analyze silicon and phosphorus, wherein Si=0.015g / L; P=0.005g / L.

Embodiment 2

[0042] CaO:V 2 The molar ratio of 0 is 4~5 vanadium slag carries out calcification roasting in the temperature of 800~900 ℃ to obtain vanadium-containing material; Take the vanadium-containing material (V 2 0 5 17.85%, P0.04%) 200g, add 6.4g ferric phosphate into 700mL water together, adjust slurry pH=0.6~0.8 with sulfuric acid at normal temperature and stir reaction 70min, solid-liquid separation, in the acid leaching residue obtained 2 0 5 The vanadium content is 0.8%, the vanadium leaching rate is 95.0%; the leachate V 5+ Concentration 26.46g / L, P concentration 2.58g / L; into the acidic leaching solution ([Si]=0.54g / L, [P]=0.81g / L, pH 2.4) with Al:Si=1.4:1 (mass ratio); add 4.61g of aluminum sulfate, Fe:P=1.0:1 (mass ratio), add 2.96g of iron sulfate, stir at a temperature of 60-80°C for 60min, add ammonium salt to adjust the pH value to 3.5, and stir for 50min. Let stand for 1 hour, filter, and analyze silicon and phosphorus, wherein Si=0.014g / L; P=0.006g / L.

Embodiment 3

[0044] CaO:V 2 The molar ratio of O is that the vanadium slag of 4~5 carries out calcification roasting in the temperature of 800~900 ℃ to obtain vanadium-containing material; Get the vanadium-containing material (V 2 0 5 17.85%, P0.04%) 200g, add 6.4g ferric phosphate into 700mL water together, adjust slurry pH=0.6~0.8 with sulfuric acid at normal temperature and stir reaction 70min, solid-liquid separation, in the acid leaching residue obtained 2 0 5 The vanadium content is 0.82%, the vanadium leaching rate is 95.2%; the leachate V 5+ Concentration 26.56g / L, P concentration 2.68g / L; into the acidic leaching solution ([Si]=0.55g / L, [P]=0.83g / L, pH 2.4) with Al:Si=1.4:1 (mass ratio); add 4.43g of aluminum chloride, Fe:P=1:1 (mass ratio), add 2.43g of ferric chloride, stir at a temperature of 60-80°C for 60min, add ammonium salt to adjust the pH value to 3.6, and stir to react 50min, let stand for 1h, filter, and analyze silicon and phosphorus, wherein Si=0.14g / L; P=0.007g / ...

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Abstract

The embodiment of the application provides a method of extracting vanadium and removing phosphorous from phosphorous containing vanadium slag. The method comprises: roasting the phosphorous containing vanadium slag to obtain a vanadium containing material; mixing the vanadium containing material with a phosphate and a sulfuric acid for acid leaching; carrying out solid-liquid separation to obtain a leachate, wherein in the acid leaching process, pH of the mixed slurry is controlled at 0.5-1.5, a phosphorus concentration in the leachate is 0.3-4 g / L, and a vanadium concentration is 10-25 g / L; and carrying out a reaction on the leachate with an aluminum salt and a ferric salt and then adjusting the pH to 3-4.5 for removing phosphorous, and carrying out solid-liquid separation to obtain phosphate slag and a phosphorous removing solution. A purpose of extracting vanadium deeply can be achieved by the application scheme, silicon and phosphorous in the acidic vanadium containing solution can be removed effectively, and silicon and phosphorous removal effect is obvious.

Description

technical field [0001] The application belongs to the field of chemical industry, and specifically relates to a method for extracting vanadium and dephosphorizing vanadium-containing slag. Background technique [0002] Due to their excellent physical and chemical properties, vanadium and its compounds are widely used in aerospace, steel, chemical industry, electronic energy, medicine and other fields, and are called "monosodium glutamate of modern industry". Vanadium-titanium magnetite is a polymetallic symbiotic ore of vanadium, titanium and iron, and is an important resource for extracting vanadium in my country. The Panzhihua-Xichang region is the region with the most abundant vanadium and titanium resources in China. At present, the proven reserves of vanadium-titanium magnetite are 6.73 billion tons, and the prospective reserves are 10 billion tons, of which vanadium (V 2 o 5 ) of 14.75 million tons, the vanadium reserves account for 67.3% of the country's total, rank...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/22C22B3/44C22B3/08
CPCC22B7/04C22B7/007C22B34/22C22B3/44Y02P10/20
Inventor 张涛叶芊
Owner CHONGQING UNIV OF EDUCATION