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Method for extracting vanadium pentoxide from vanadium slag

The technology of vanadium pentoxide and vanadium slag is applied in the field of vanadium metallurgy, which can solve the problems of equipment investment and operation difficulties, high energy consumption and high equipment requirements, and achieve the effects of high leaching rate, low environmental pollution and low equipment requirements.

Inactive Publication Date: 2010-12-01
SICHUAN CHUANWEI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have achieved good results in vanadium extraction, but high temperature and high pressure have high requirements on equipment, which brings great difficulties to equipment investment and operation, and the energy consumption in the production process is relatively high.

Method used

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  • Method for extracting vanadium pentoxide from vanadium slag
  • Method for extracting vanadium pentoxide from vanadium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 adopts the inventive method to extract vanadium pentoxide from vanadium slag

[0029] The vanadium slag is crushed and ball milled, and the passing rate of passing through 200 mesh reaches 82%, and 100g of refined vanadium slag is weighed and roasted under aerobic conditions. The roasting temperature is 850°C, and the time is controlled at 3.0h;

[0030] Grind the clinker in a ball mill, then add 20% potassium hydroxide solution and 15% sodium carbonate solution for leaching, the liquid-solid ratio is 4:1, the leaching reaction temperature is 120°C, and the leaching reaction time is 1.0h. The clinker was washed 5 times; the feed liquid was subjected to solid-liquid separation at 90°C, and filtered to obtain 14g / L vanadium-containing solution and tailings;

[0031] Add 0.3 parts by mass of CaCl to the vanadium-containing solution 2 and 0.2 parts by mass of Al 2 (SO 4 ) 3 Carry out impurity removal, the time for impurity removal is 0.5h, and remove slag a...

Embodiment 2

[0034] Embodiment 2 adopts the inventive method to extract vanadium pentoxide from vanadium slag

[0035] The vanadium slag is crushed and ball milled, and the passing rate of passing through 200 meshes reaches 90%. Weigh 100g of refined vanadium slag and roast it under aerobic conditions. The roasting temperature is 1000°C, and the time is controlled at 1.0h;

[0036] Grind the clinker in a ball mill, then add 20% potassium carbonate solution and 30% sodium sulfate solution for leaching, the liquid-solid ratio is 2:1, the leaching reaction temperature is 150°C, and the leaching reaction time is 2.0h. The clinker was washed 4 times; the feed liquid was subjected to solid-liquid separation at 120°C, and filtered to obtain 27g / L vanadium-containing solution and tailings;

[0037] Add 0.1 mass parts of CaO and 0.4 mass parts of MgCl to the vanadium-containing solution 2 Carry out impurity removal, the impurity removal time is 1.0h, and remove slag after the reaction is completed...

Embodiment 3

[0040] Embodiment 3 adopts the inventive method to extract vanadium pentoxide from vanadium slag

[0041] The vanadium slag is crushed and ball milled, and the passing rate of passing through 200 meshes reaches 86%. Weigh 100g of refined vanadium slag and roast it under aerobic conditions. The roasting temperature is 900°C, and the time is controlled at 1.0h;

[0042] Grind the clinker in a ball mill, then add 30% sodium hydroxide solution and 15% sodium carbonate solution for leaching, the liquid-solid ratio is 3:1, the leaching reaction temperature is 130°C, and the leaching reaction time is 1.5h. The clinker was washed 3 times; the feed liquid was subjected to solid-liquid separation at 95°C, and filtered to obtain 21g / L vanadium-containing solution and tailings;

[0043] Add 0.5 parts by mass of CaCl to the vanadium-containing solution 2 Carry out impurity removal, the impurity removal time is 1.0h, and remove slag after the reaction is completed; the liquid phase is cool...

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Abstract

The invention relates to a method for extracting vanadium pentoxide from vanadium slag, belonging to the field of vanadium metallurgy. In order to solve the technical problem, the invention provides a method for extracting vanadium pentoxide from vanadium slag with less environment pollution. The method comprises the following steps of: a. smashing the vanadium slag, and removing metal iron to obtain the refined vanadium slag; b. baking the refined vanadium slag at 800-1000 DEG C to obtain grog; c. adding the grog into alkali liquor for leaching, and filtering with hot to obtain vanadium-containing solution and tailings; d. removing impurity in the vanadium-containing solution, reducing the temperature of the impurity-removed and vanadium-containing solution to be less than 35 DEG C, crystallizing and filtering to obtain Na3VO4.5-12H2O crystalloid and filtering mother liquor thereof; and e. dissolving the Na3VO4.5-12H2O crystalloid by adding water, treating with an acid ammonium salt precipitation method to obtain ammonium poly-vanadate or ammonium metavanadate, and dehydrating, deaminizing and melting the ammonium poly-vanadate or the ammonium metavanadate to obtain the vanadium pentoxide.

Description

Technical field [0001] The invention relates to a method for extracting vanadium pentoxide from vanadium slag, and belongs to the field of vanadium metallurgy. Background technique [0002] At present, vanadium extraction from vanadium residues at home and abroad mainly adopts sodium roasting, pressurized alkali leaching, calcification roasting acid leaching and calcification roasting alkali carbonation leaching. [0003] The traditional vanadium slag sodium roasting process for vanadium extraction (roasting with sodium carbonate, sodium chloride, sodium sulfate and other soda agents) will produce a large amount of chlorine and hydrogen chloride gas during the roasting process, which seriously pollutes the environment. The country's environmental protection requirements are becoming more and more stringent, and sodium roasting is strictly restricted. However, the calcium roasting and acid leaching process consumes a lot of acid, causes serious equipment corrosion, and the w...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/02C22B3/12C22B3/22
CPCY02P10/20
Inventor 兰钢汪大成官仁权郭宝林
Owner SICHUAN CHUANWEI GRP CO LTD
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