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Method for enhancing red mud dealkalization absorption of SO2 by using MgCl2 and utilizing ore pulp

A technology of SO2 and dealkalization, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, can solve problems such as difficult large-scale application, no waste utilization, and single purpose, so as to control emissions, improve utilization, Effect of reducing environmental burden

Pending Publication Date: 2022-07-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfur dioxide can also cause environmental problems such as acid rain and photochemical smog
[0004] At present, there have been many studies and experiments on the use of red mud for flue gas desulfurization, and some people have studied how to increase the alkali leaching rate of red mud to achieve high-efficiency desulfurization. However, the general process is complex and the purpose is single, and it is difficult to achieve without subsequent waste utilization. large-scale application

Method used

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  • Method for enhancing red mud dealkalization absorption of SO2 by using MgCl2 and utilizing ore pulp
  • Method for enhancing red mud dealkalization absorption of SO2 by using MgCl2 and utilizing ore pulp
  • Method for enhancing red mud dealkalization absorption of SO2 by using MgCl2 and utilizing ore pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Utilize MgCl 2 Enhanced red mud dealkalization to absorb SO 2 And the method for utilizing the pulp includes the following steps:

[0051] S1, the red mud is pulverized, ground, passed through a 100-mesh sieve, and then transferred to the reaction bed, and water is added to stir for slurrying, and MgCl is added during the stirring process. 2 solution, the dealkalization time is 30min, the liquid-solid ratio of water and red mud is 18mL:1g, MgCl 2 The concentration is controlled at 0.04mol / L, and the temperature of the dealkalization process is controlled at 170℃;

[0052] S2. After the red mud is dealkalized, the reaction bed is fed with SO 2 At the same time, aeration and oxidation are carried out. During the desulfurization period, continuous stirring is carried out. The desulfurization time is 2h. 2 of smoke and aerated O 2 The volume ratio is 1:15, and the passage contains SO 2 The flow rate of the flue gas is 35mL / min, and the desulfurization temperature is c...

Embodiment 2

[0055] Utilize MgCl 2 Enhanced red mud dealkalization to absorb SO 2 And the method for utilizing the pulp includes the following steps:

[0056] S1, the red mud is pulverized, ground, passed through a 100-mesh sieve, and then transferred to the reaction bed, and water is added to stir for slurrying, and MgCl is added during the stirring process. 2 Solution, dealkalization time 60min, liquid-solid ratio of water and red mud is 22mL:1g, MgCl 2 The concentration is controlled at 0.06mol / L, and the temperature of the dealkalization process is controlled at 190℃;

[0057] S2. After the red mud is dealkalized, the reaction bed is fed with SO 2 At the same time, aeration and oxidation are carried out, and continuous stirring is carried out during the desulfurization period. The desulfurization time is 4h. 2 of smoke and aerated O 2 The volume ratio is 1: 25, and the feed contains SO 2 The flow rate of the flue gas is 50mL / min, and the desulfurization temperature is controlled ...

Embodiment 3

[0060] Utilize MgCl 2 Enhanced red mud dealkalization to absorb SO 2 And the method for utilizing the pulp includes the following steps:

[0061] S1, the red mud is pulverized, ground, passed through a 100-mesh sieve, and then transferred to the reaction bed, and water is added to stir for slurrying, and MgCl is added during the stirring process. 2 The solution, the dealkalization time is 45min, the liquid-solid ratio of water and red mud is 20mL:1g, MgCl 2 Its concentration is controlled at 0.05mol / L, and the temperature of the dealkalization process is controlled at 180℃;

[0062] S2. After the red mud is dealkalized, the reaction bed is fed with SO 2 At the same time, aeration and oxidation are carried out, and continuous stirring is carried out during the desulfurization period. The desulfurization time is 3h. 2 of smoke and aerated O 2 The volume ratio is 1:20, and the passage contains SO 2 The flow rate of the flue gas is 42.5mL / min, and the desulfurization tempera...

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Abstract

The invention discloses a method for enhancing red mud dealkalization absorption of SO2 by using MgCl2 and utilizing ore pulp. The method comprises the steps of dealkalization, desulfurization and comprehensive utilization. According to the invention, the dealkalized red mud can be used for flue gas desulfurization, the dealkalization and desulfurization efficiency is high, the energy consumption is low, the resource utilization of the red mud is realized, and the emission of sulfur dioxide is controlled; the desulfurized red mud pulp is used for carbon sequestration, the treatment process is simple, additives are cheap and easy to obtain, and the method is practical.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a kind of utilization of MgCl 2 Enhanced red mud dealkalization to absorb SO 2 and the method of utilizing the pulp. Background technique [0002] my country is rich in bauxite resources, with proven reserves of 5.089 billion tons by the end of 2017. There are various methods of extracting alumina from ores, of which the Bayer process is the main method for producing alumina. Red mud is a by-product of the alumina production process. The output of red mud varies according to the type of bauxite, ore grade and production process. For every ton of alumina produced, 1-2 tons of red mud will be produced. Each alumina plant will have a red mud yard for red mud storage. At present, it seems that there is no effective way to deal with red mud. The accumulated red mud will not only occupy the land, its dust will pollute the atmosphere, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/80B01D53/50
Inventor 赵群阳耀熙田森林宁平孙鑫李英杰胡学伟黄建洪李彬杨枢璞文悟
Owner KUNMING UNIV OF SCI & TECH
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