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Vanadium extraction method of high calcium and high phosphorus vanadium slag

A high-calcium and high-phosphorus vanadium slag and vanadium precipitation technology is applied in the direction of improving process efficiency, which can solve the problems of high cost, difficulty in recovering vanadium from the second acid leaching solution, and difficulty in realizing industrialization, and achieves a short technological process. , the effect of less investment and easy implementation

Active Publication Date: 2019-01-15
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method achieves the purpose of deep phosphorus removal from the solution by starting to remove phosphorus 30 minutes before the first acid leaching reaction of the clinker; the first acid leaching residue is dephosphorized by the second acid leaching, and at the same time, the residue is further recovered. vanadium, but there are problems in the process of recovering vanadium from the second acid leaching solution, which are difficult and costly, and it is difficult to realize industrialization
[0007] So far, there is no feasible vanadium extraction method for high calcium and high phosphorus vanadium slag

Method used

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  • Vanadium extraction method of high calcium and high phosphorus vanadium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Embodiment 1 adopts the inventive method to extract vanadium from high-calcium and high-phosphorus vanadium slag

[0084] The high calcium and high phosphorus vanadium slag (V 2 o 5 =10.71%, CaO=6.75%, P=0.38%), ground to a particle size of less than 0.12mm, placed in an air-filled muffle furnace, heated to 890°C and kept for 90min, taken out and cooled to make a sample below 0.12mm.

[0085] Take 100g of the clinker after sample preparation for acid leaching (first-stage leaching), 300mL of mother liquor, control the pH of the system with sulfuric acid to 3.0-3.2 under stirring conditions, and leaching for 45min at a temperature of 55°C, add to the first leaching solution 0.5g of polymerized ferric sulfate (the first stage of phosphorus removal), and then stirred for 5 minutes to separate the liquid and solid to obtain a vanadium-containing liquid. The measured TV=32.86g / L and P=0.025g / L in the vanadium-containing liquid.

[0086] Add ammonium sulfate to the vanadium...

Embodiment 2

[0093] Embodiment 2 adopts the method of the present invention to extract vanadium from high-calcium and high-phosphorus vanadium slag

[0094] The high calcium and high phosphorus vanadium slag (V 2 o 5 =14.52%, CaO=10.16%, P=0.74%), ground to a particle size of less than 0.12mm, placed in an air-filled muffle furnace, heated to 900°C and kept for 60min, taken out and cooled to make a sample below 0.12mm.

[0095] Take 100g of clinker after sample preparation for acid leaching (first-stage leaching), 300mL of mother liquor, use sulfuric acid to control the system pH=3.0-3.3 under stirring conditions, and leaching for 60min at a temperature of 68°C, add 0.65g of polymerized ferric sulfate (the first stage of phosphorus removal), and then stirred for 10 minutes to separate the liquid and solid to obtain a vanadium-containing liquid. It was measured that TV=36.73g / L and P=0.022g / L in the vanadium-containing liquid.

[0096] Add ammonium sulfate to the vanadium-containing liqui...

Embodiment 3

[0103] Embodiment 3 adopts the method of the present invention to extract vanadium from high-calcium and high-phosphorus vanadium slag

[0104] The high calcium and high phosphorus vanadium slag (V 2 o 5 =12.75%, CaO=8.91%, P=0.50%), ground to a particle size of less than 0.12mm, placed in an air-filled muffle furnace, heated to 900°C and kept for 60min, taken out and cooled to make a sample below 0.12mm.

[0105] Take 100g of clinker after sample preparation for acid leaching (first-stage leaching), 300mL of mother liquor, control system pH=3.2-3.5 with sulfuric acid under stirring condition, and leaching for 60min at 45°C, add to the first leaching solution 0.4g of polymerized ferric sulfate (the first stage of phosphorus removal), and then stirred for 5 minutes, liquid-solid separation to obtain a vanadium-containing liquid, measured TV = 34.59g / L, P = 0.025g / L in the vanadium-containing liquid.

[0106] Add ammonium sulfate to the vanadium-containing liquid at a mass rat...

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Abstract

The invention relates to a vanadium extraction method of high calcium and high phosphorus vanadium slag, and belongs to the field of preparation of vanadium oxide. The vanadium extraction method of the high calcium and high phosphorus vanadium slag comprises the following steps: a, taking the high calcium and high phosphorus vanadium slag and roasting to obtain roasted clinker; b, primary leaching: enabling the pH valve of a leached solution to be 3.0 to 3.5, carrying out solid-liquid separation to obtain first leachate and first residues; c, primary dephosphorization: adding a phosphate removing agent into the first leachate, carrying out solid-liquid separation and collecting a liquid phase to obtain vanadium-containing liquid. The high calcium and high phosphorus vanadium slag contains9 to 25 percent of V2O5, 5 to 14 percent of CaO and 0.3 to 1.5 percent of P. By adopting the vanadium extraction method disclosed by the invention, a vanadium pentoxide product in accordance with theindustry standard can be prepared by taking the high calcium and high phosphorus vanadium slag as a raw material; in addition, the vanadium extraction method has the advantages of high recovery rate of vanadium, short process flow, less investment and easiness in implementation.

Description

technical field [0001] The invention relates to a method for extracting vanadium from high-calcium and high-phosphorus vanadium slag, and belongs to the field of extracting vanadium oxide. Background technique [0002] Vanadium-titanium magnetite is subjected to high temperature treatment in blast furnace or electric furnace to obtain vanadium-containing molten iron, and vanadium slag is selectively oxidized from molten iron. It is then further blown into qualified molten steel, which is currently the mainstream vanadium extraction-steelmaking method. [0003] In recent years, as users have increasingly stringent requirements on steel performance, high-quality steel requires P≤0.015wt%, and aerospace low-temperature steel pipes and tinplates require P≤0.01wt%. If vanadium-titanium magnetite is used for smelting, the P content in molten iron is usually high, ranging from 0.06wt% to 0.08wt%. The P in steel is still as high as 0.060wt%-0.090wt%. If only dephosphorization is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/02C22B34/22
CPCC22B1/02C22B7/007C22B7/04C22B34/22Y02P10/20C22B1/04C22B3/04
Inventor 何文艺彭毅陈燕申彪
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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