Desulfuration technique with jet bubble process using red mud as absorbing agent

A technology of red mud slurry and bubble tower, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, and can solve problems such as scaling of alumina plant pipeline equipment

Inactive Publication Date: 2009-07-15
BEIJING BOOTES ELECTRIC POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supernatant returned to the alumina plant will contain a certain amount of sulfite and sulfate due

Method used

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  • Desulfuration technique with jet bubble process using red mud as absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The flue gas volume at the inlet of the desulfurization unit is 10000Nm 3 / h, SO 2 The concentration is 4000mg / Nm 3 , The temperature is 120°C; the pH value of the red mud absorption slurry is 12.5, and the solid content of the slurry is 20%; the immersion depth of the bubble tube is 200mm, and the pH value of the slurry in the absorption tower is 5.0. Under the above conditions, SO at the outlet of the absorption tower 2 The content is 300mg / Nm 3 , The desulfurization efficiency can reach 92.5%.

Embodiment 2

[0032] The flue gas volume at the inlet of the desulfurization unit is 10000Nm 3 / h, SO 2 The concentration is 4000mg / Nm 3 , The temperature is 120°C; the pH value of the red mud absorption slurry is 12.5, and the solid content of the slurry is 20%; the immersion depth of the bubble tube is 200mm, and the pH value of the slurry in the absorption tower is 6.0. Under the above conditions, SO at the outlet of the absorption tower 2 The content is 250mg / Nm 3 , The desulfurization efficiency can reach 93.8%.

Embodiment 3

[0034] The flue gas volume at the inlet of the desulfurization unit is 10000Nm 3 / h, SO 2 The concentration is 4000mg / Nm 3 , The temperature is 120°C; the pH value of the red mud absorption slurry is 12.5, and the solid content of the slurry is 20%; the immersion depth of the bubble tube is 200mm, and the pH value of the slurry in the absorption tower is 7.0. Under the above conditions, SO at the outlet of the absorption tower 2 The content is 200mg / Nm 3 , Desulfurization efficiency can reach 95%.

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Abstract

The invention provides a desulfurization method by a bubbling method taking red mud as an absorbing agent. The desulfurization method comprises the following steps: (a) introducing the pollution gas into a bubbling tower from a gas inlet on the upper part of the bubbling tower, ensuring that the pollution gas is contacted with red mud slurry which is sprayed into the bubbling tower from a nozzle blow the gas inlet and oxidizing gas introduced by an oxidizing wind pipe of which one end extends into the red mud slurry and has oxidation reaction and neutralization reaction in the bubbling tower; (b) exhausting the purified gas from an exhaust opening on the middle lower part of the bubbling tower; (c) discharging slurry from a liquid discharging pipe below the tower, precipitating the slurry to be separated into concentrated slurry and supernatant, leading the concentrated slurry to a stock dump, returning the supernatant to the bubble tower or leading the supernatant to subsequent neutralization and reprecipitation step; (d) neutralization and reprecipitation: adding lime milk to the separated supernatant for neutralization and reprecipitation to be separated into the concentrated slurry and supernatant, leading the concentrated slurry to the stock dump, and returning the supernatant to an aluminum plant. The invention also provides an application of the red mud slurry in the desulfurization process.

Description

Technical field [0001] The invention relates to a bubbling method deacid gas (especially desulfurization) process using waste red mud discharged during the alumina production process as an absorbent for deacidification gas (especially desulfurization). Background technique [0002] The industrial waste residue red mud produced in the alumina production process is a serious source of alkaline pollution. Due to the different production methods and grades of bauxite, about 1 to 2 tons of red mud are produced for every 1 ton of alumina produced. Red mud is discharged by wet method, with 3~4m per ton of red mud 3 Waste liquid, its mass concentration is Na 2 O is calculated as 2~7g / L. The storage of red mud not only occupies a lot of land and farmland, and consumes a lot of yard construction and maintenance costs, but also the remaining alkali in the red mud can penetrate into the ground, causing groundwater pollution. Due to the unique physical and chemical properties of red mud and i...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50
Inventor 李永旺张明刘鹏程吴树志
Owner BEIJING BOOTES ELECTRIC POWER SCI & TECH
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