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Method for extracting vanadium from vanadium-containing refined tailings through pre-oxidation

A technology of pre-oxidation and vanadium pentoxide, applied in the field of chemical metallurgy, can solve problems such as unfavorable chlorine recovery and utilization, vanadium loss and the like

Pending Publication Date: 2022-04-15
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

[0004] The purpose of the present invention is to overcome the problems of vanadium-containing refined tailings pre-oxidation dechlorination process in the prior art, which causes vanadium loss and is not conducive to the recovery and utilization of chlorine gas, and provides a vanadium-containing refined tailings pre-oxidation vanadium extraction process The method uses vanadium oxide as an additive to achieve the purpose of efficient dechlorination of refined tailings and reduction of vanadium loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Weigh 100g vanadium-containing refined tailings, 20gV 2 o 5 and 30gV 2 o 3 And mix evenly, wherein, the content of V, Ti, Cl, C in the refined tailings is respectively 20% by weight, 25% by weight, 41% by weight, 10% by weight, V 2 o 5 The purity is 98%, V 2 o 3 The purity is 82%, refined tailings, V 2 o 5 and V 2 o 3 The particle size is -200 mesh;

[0048] (2) The mixture in step (1) is placed in a crucible, and then the crucible is placed in a muffle furnace to carry out pre-oxidation roasting under an oxygen atmosphere, wherein the roasting temperature is 500 ° C, O 2 The flow rate is 1L / min. During the roasting reaction, the tail gas is purified and absorbed by 25% NaOH aqueous solution. After 2 hours of roasting reaction, the roasted material is taken out and cooled to obtain 89g of roasted material. The loss of vanadium in the roasting process is calculated to be 3.07%, and the sample chlorine The content is 2.06%;

[0049] (3) Grind the roasted m...

Embodiment 2

[0053] (1) Weigh 100g vanadium-containing refined tailings, 25gV 2 o 5 and 25gV 2 o 3 And mix evenly, wherein, the content of V, Ti, Cl, C in the refined tailings is respectively 10% by weight, 30% by weight, 32% by weight, 15% by weight, V 2 o 5 The purity is 98%, V 2 o 3 The purity is 82%, refined tailings, V 2 o 5 and V 2 o 3 The particle size is -200 mesh;

[0054] (2) The mixture in step (1) is placed in a crucible, and then the crucible is placed in a muffle furnace to carry out pre-oxidation roasting under an oxygen atmosphere, wherein the roasting temperature is 400 ° C, O 2 The flow rate is 1L / min. During the roasting reaction, the tail gas is purified and absorbed by 25% NaOH aqueous solution. After 4 hours of roasting reaction, the roasted material is taken out and cooled to obtain 92g of roasted material. The calculated loss of vanadium in the roasting process is 2.91%, and the sample chlorine The content is 2.96%;

[0055] (3) Grind the roasted materia...

Embodiment 3

[0059] (1) Weigh 100g vanadium-containing refined tailings, 30gV 2 o 5 and 20gV 2 o 3 and mix evenly, wherein, the contents of V, Ti, Cl and C in the refined tailings are respectively 25% by weight, 15% by weight, 50% by weight, 5% by weight, and V 2 o 5 The purity is 98%, V 2 o 3 The purity is 82%, refined tailings, V 2 o 5 and V 2 o 3 The particle size is -200 mesh;

[0060] (2) The mixture in step (1) is placed in a crucible, and then the crucible is placed in a muffle furnace to carry out pre-oxidation roasting under an oxygen atmosphere, wherein the roasting temperature is 600 ° C, O 2 The flow rate is 1L / min. During the roasting reaction, the tail gas is purified and absorbed by 25% NaOH aqueous solution. After 1 hour of roasting reaction, the roasted material is taken out and cooled to obtain 86g of roasted material. The calculated loss of vanadium in the roasting process is 3.57%, and the sample chlorine The content is 0.82%;

[0061] (3) Grind the roasted ...

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Abstract

The invention relates to the technical field of chemical metallurgy, and discloses a method for extracting vanadium from vanadium-containing refined tailings through pre-oxidation. The method comprises the following steps: (1) mixing the vanadium-containing refined tailings, vanadium pentoxide and vanadium trioxide according to a mass ratio of 100: (20-30): (20-30); (2) putting the mixture into a crucible, carrying out pre-oxidation roasting in an oxygen atmosphere at the roasting temperature of 400-600 DEG C for 1-4 hours, and introducing roasting tail gas into an alkaline solution for absorption; (3) the roasted material is ground, the ground material is added into an alkaline solution to be stirred and leached, the leaching temperature ranges from 80 DEG C to 90 DEG C, the leaching time ranges from 0.5 h to 2 h, and the leaching liquid-solid mass ratio is (5-10): 1; and (4) filtering the leaching slurry to obtain a leaching solution and leaching residues. The method is easy and convenient to operate, the oxidation dechlorination efficiency is high, chlorine in the dechlorination tail gas can be recycled, and meanwhile the vanadium yield is high.

Description

technical field [0001] The invention relates to the technical field of chemical industry and metallurgy, in particular to a method for pre-oxidizing vanadium-containing refined tailings. Background technique [0002] In titanium tetrachloride (TiCl 4 ) in the preparation process, because the raw material contains a certain amount of vanadium, in the raw material chlorination process, vanadium is almost all chlorinated, and vanadium oxychloride (VOCl 3 ) form into TiCl 4 In, the influence of TiCl 4 subsequent application performance. In industry, metal copper, aluminum and organic substances are usually used as reducing agents, and the crude TiCl 4 VOCl in 3 reduced to vanadium trichloride (VCl 3 ) or vanadium oxychloride (VOCl 2 ) solid; through sedimentation, distillation, etc., to obtain vanadium-rich tailings, referred to as vanadium-containing refined tailings. [0003] According to the characteristics of titanium chlorination raw materials, there are some differ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B34/22
CPCY02P10/20
Inventor 杜光超彭毅汪劲鹏饶玉忠范川林朱庆山
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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