Method for oxygen-enriched calcification calcination of high-grade vanadium slag

A calcified roasting and high-grade technology, which is applied in the field of calcified roasted vanadium slag, can solve the problems of increasing the material handling capacity of roasting equipment, reducing the roasting temperature, and high conversion rate of roasted vanadium, so as to achieve the effect of perfecting the industrialization technology and reducing the roasting temperature

Inactive Publication Date: 2012-12-19
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calcination temperature in this research is low, although there will be no problems such as material sintering and calcination equipment ringing, but there is a problem of low vanadium transfer rate
[0006] So far, there is no such thing as reducing the roasting temperature (to ensure the normal operation of the roasting equipment) and not increasing the material handling capacity of the roasting equipment and prolonging the roasting time (guaranteeing the roasting equipment's normal operation) while ensuring the high vanadium leaching rate of high-grade vanadium slag calcification roasting. Normal operating efficiency) related literature and research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] High-grade vanadium slag (containing V 2 o 512.57wt%, CaO 1.64wt%) and limestone (containing CaO 52.38wt%) according to the mass ratio of vanadium slag:limestone=100:13.5 batching, mixing, roasting in the electrothermal rotary tube of Φ149×2000mm. The rotary tube controls the roasting temperature of the high-temperature section to be 880°C, the residence time of the mixture in the high-temperature section is controlled at 20-30min, and the oxygen volume content in the atmosphere in the rotary tube is controlled at 12-14% by adjusting the ratio of nitrogen and compressed air. Intake flow according to the intake flow (m 3 / h): feeding speed (Kg / h) = 2:1. Grind the clinker obtained by roasting until the particle diameter is less than 0.125mm, and then take 100g to test the effect of dilute sulfuric acid leaching. The ratio is 2:1. After the acid leaching reaction is completed, filter, wash, and dry the residue. The residue obtained after drying is 93.62g, and the V in ...

Embodiment 2

[0030] High-grade vanadium slag (containing V 2 o 5 16.52wt%, CaO 2.04wt%) and limestone (containing CaO 52.38wt%) according to the mass ratio of vanadium slag:limestone = 100:16, mixed and roasted in an electrothermal rotary tube of Φ149×2000mm. The rotary tube controls the roasting temperature of the high-temperature section to be 860°C, the residence time of the mixture in the high-temperature section is controlled at 40-50 minutes, and the oxygen volume content in the atmosphere in the rotary tube is controlled at 15-17% by adjusting the ratio of nitrogen and compressed air. Intake flow according to the intake flow (m 3 / h): feeding speed (Kg / h) = 2:1. Grind the clinker obtained by roasting until the particle diameter is less than 0.125mm, and then take 100g to test the effect of dilute sulfuric acid leaching. The ratio is 2:1. After the acid leaching reaction is completed, filter, wash, and dry the residue. The residue obtained after drying is 92.27g, and the V in the...

Embodiment 3

[0032] High-grade vanadium slag (containing V 2 o 5 19.36wt%, CaO 2.16wt%) and limestone (containing CaO 52.38wt%) according to the mass ratio of vanadium slag:limestone = 100:20, mixed evenly and roasted in the electrothermal rotary tube of Φ149×2000mm. The rotary tube controls the roasting temperature of the high-temperature section to be 830°C, the residence time of the material in the high-temperature section is controlled at 50-60min, and the oxygen volume content in the atmosphere in the rotary tube is controlled at 19-21% by adjusting the ratio of nitrogen and compressed air. The air flow is according to the intake flow (m 3 / h): feeding speed (Kg / h) = 2:1. Grind the clinker obtained by roasting until the particle diameter is less than 0.125mm, and then take 100g to test the effect of dilute sulfuric acid leaching. The ratio is 2:1. After the acid leaching reaction is completed, filter, wash, and dry the residue. The residue obtained after drying is 90.20g, and the ...

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Abstract

The invention discloses a method for oxygen-enriched calcification calcination of high-grade vanadium slag. The method comprises the following steps of mixing high-grade vanadium slag and a calcification agent to obtain a mixture and carrying out calcination of the mixture in an atmosphere having oxygen volume content of 12 to 21%. The method for oxygen-enriched calcification calcination of high-grade vanadium slag greatly reduces a calcification calcination temperature of high-grade vanadium slag, solves the problem that in calcification calcination of high-grade vanadium slag, abnormal running problems such as material agglomeration and calcination equipment ring-forming are caused by a high calcination temperature, and improves an industrialization technology of calcification calcination of high-grade vanadium slag.

Description

technical field [0001] The invention relates to a method for calcifying and roasting vanadium slag, which belongs to the field of extracting vanadium oxide. Background technique [0002] The current high-grade vanadium slag roasting technology, whether it is calcification roasting or sodium roasting, has high roasting temperature, and the material produces a large amount of liquid phase during the roasting process, resulting in sintering of the material, ring formation in the rotary kiln or sticking of rake teeth in the multi-hearth furnace. and stacking issues. In order to solve the problem that the roasting equipment cannot operate normally due to too much liquid phase in the roasting process of high-grade vanadium slag, the V 2 o 5 The mass content is controlled at 8-9%. This method usually increases the material handling capacity of the roasting equipment by 70-80%. However, the calcification roasting process is currently only carried out by Panzhihua Iron and Steel Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/04C22B34/22
CPCY02P10/20
Inventor 付自碧彭毅何文艺高官金申彪曹鹏卢晓林张林余乐
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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