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Roasting method of secondary slag

A secondary slag and roasting technology, applied in the field of vanadium slag roasting, can solve the problems of affecting the secondary slag roasting effect, low conversion rate of secondary slag clinker, restricting the release of production capacity, etc., so as to prolong the oxidation reaction time and improve the clinker Conversion rate, the effect of preventing over-burning

Pending Publication Date: 2022-01-28
承德钒钛新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the secondary slag is directly roasted, the impurities in the secondary slag can easily form a sintered layer on its surface under high temperature conditions, which hinders the diffusion of oxygen, and the low-valent vanadium inside the secondary slag particles is difficult to be continuously oxidized. As a result, the roasting effect of the secondary slag is seriously affected, resulting in low clinker conversion rate of the secondary slag and low vanadium yield of the system, which seriously restricts the release of production capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a method for roasting secondary slag, comprising the steps of:

[0025] (1) The secondary slag with the vanadium content of 0.6wt% and the fine slag with a vanadium content of 5.5wt% are uniformly mixed, the mass ratio of the secondary slag and the fine slag is 2.5:1, and the vanadium content is 2.0wt%. scum.

[0026] (2) Add sodium carbonate to the mixed slag with a vanadium content of 2.0 wt%, and mix evenly to obtain a mixed material. The mass ratio of the mass of sodium carbonate to the vanadium pentoxide in the mixed slag is 0.5:1.

[0027] (3) Put the mixed material into the rotary kiln for sodium oxide roasting. In the rotary kiln, the temperature of the head end of the preheating zone is controlled at 280°C, the maximum temperature of the firing zone is controlled at 850°C, and the temperature of the cooling zone is controlled at 550°C. The clinker obtained immediately after the sodium oxidation roasting was finished, and the clinker wa...

Embodiment 2

[0029] This embodiment provides a method for roasting secondary slag, comprising the steps of:

[0030] (1) Mix the secondary slag with a vanadium content of 1.75wt% and the fine slag with a vanadium content of 5wt%, and the mass ratio of the secondary slag to the fine slag is 4:1 to obtain a mixed slag with a vanadium content of 2.4wt%. .

[0031] (2) Add sodium carbonate to the mixed slag with a vanadium content of 2.4wt%, and mix evenly to obtain a mixed material. The mass ratio of the mass of sodium carbonate to the vanadium pentoxide in the mixed slag is 0.4:1.

[0032] (3) Put the mixed material into the rotary kiln for sodium oxide roasting. In the rotary kiln, the temperature of the head of the preheating zone is controlled at 320°C, the maximum temperature of the firing zone is controlled at 750°C, and the temperature of the cooling zone is controlled at 620°C. After the sodium roasting, the clinker was immediately discharged from the kiln, and the measured conversio...

Embodiment 3

[0034] This embodiment provides a method for roasting secondary slag, comprising the steps of:

[0035] (1) The secondary slag with the vanadium content of 1.5wt% and the fine slag with a vanadium content of 4.5wt% are evenly mixed, the mass ratio of the secondary slag and the fine slag is 3.5:1, and the vanadium content is 2.2wt%. scum.

[0036] (2) Add sodium carbonate to the mixed slag with a vanadium content of 2.2 wt%, and mix evenly to obtain a mixed material. The mass ratio of the mass of sodium carbonate to the vanadium pentoxide in the mixed slag is 0.4:1.

[0037] (3) Put the mixed material into the rotary kiln for sodium oxide roasting. In the rotary kiln, the temperature at the head of the preheating zone is controlled at 300°C, the maximum temperature in the firing zone is controlled at 770°C, and the temperature in the cooling zone is controlled at 600°C. After the sodium roasting, the clinker was immediately discharged from the kiln, and the measured conversion...

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PUM

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Abstract

The invention relates to the technical field of vanadium slag roasting, in particular to aroasting methodof secondary slag. The method comprises the following steps: uniformly mixing secondary slag and fine slag to obtain mixed slag; adding sodium carbonate into the mixed slag, and uniformly mixing to obtain a mixed material; and obtaining clinker by carrying out preheating, high-temperature treatment and cooling on the mixed material sequentially. According to the roasting method of the secondary slag, the secondary slag and the fine slag are mixed and then roasted, the total vanadium amount of the mixed slag can be increased, the optimal temperature range of preheating treatment, high-temperature treatment and cooling treatment is determined according to the vanadium content in the mixed slag, the clinker conversion rate of the secondary slag can be increased by 1.5-3%, so that the total vanadium content of the waste slag is reduced, the vanadium yield of a system is increased, and the roasting cost of the secondary slag is reduced.

Description

technical field [0001] The invention relates to the technical field of vanadium slag roasting, in particular to a method for roasting secondary slag. Background technique [0002] In the sodium roasting vanadium extraction process, the refined vanadium slag and sodium carbonate are roasted and reacted to become roasted clinker, and then subjected to water leaching and impurity removal in the leaching liquid, and acidic ammonium salt vanadium precipitation is carried out to form ammonium polyvanadate, and ammonium polyvanadate is calcined or After reduction, it produces vanadium pentoxide or vanadium trioxide. Sodium oxide roasting is one of the most critical processes in the process of vanadium extraction by sodium roasting. Sodium oxide roasting is to react low-valent vanadium in refined vanadium slag with sodium carbonate and oxygen in the air under high temperature conditions to form soluble Roasted clinker for vanadium compounds (pentavalent or tetravalent vanadium). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B34/22C22B7/04
CPCC22B1/02C22B34/22C22B7/04C22B7/001Y02P10/20
Inventor 沈国军张艳艳朱建岩王金龙秦永峰莫海飞
Owner 承德钒钛新材料有限公司