Method for synergistically extracting silica gel by removing SO2 in flue gas through steel slag

A flue gas and steel slag technology, applied in the field of industrial waste recycling, can solve the problems of inability to realize the resource utilization of desulfurization products, the comprehensive utilization rate of resources is less than 25%, occupying land and other problems, so as to realize the utilization of resources and avoid silica gel Structural damage and low SO2 effect

Pending Publication Date: 2022-03-25
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Steel slag is an alkaline industrial solid waste produced in the steelmaking process, which generally accounts for 10-15% of crude steel output, while the comprehensive utilization rate of steel slag resources is less than 25%, which means that about 75% of steel slag is in the waste stacked state, which will inevitably lead to environmental pollution, waste of resources, land occupation
The above technical solutions only realize the desulfurization of flue gas by steel slag, but cannot realize the resource utilization of desulfurization products

Method used

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  • Method for synergistically extracting silica gel by removing SO2 in flue gas through steel slag
  • Method for synergistically extracting silica gel by removing SO2 in flue gas through steel slag
  • Method for synergistically extracting silica gel by removing SO2 in flue gas through steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Mix 10 g of steel slag with a median particle size of 3.15 μm and 100 mL of water, and carry out a hydrolysis reaction at 50 ° C and 380 rpm for 5 min to obtain a slurry;

[0076] The simulated flue gas is prepared by the simulated flue gas system, where SO 2 and O 2 The volume ratio is 1:1, SO 2 and SO 2 Gas distribution balance gas N 2 The volume ratio is 5:95, O 2 and O 2 Gas distribution balance gas N 2 The volume ratio is 25:75, and the flue gas is passed into the device equipped with the slurry at a flow rate of 0.8mL / min, and the desulfurization treatment of the flue gas occurs in the device for 0.5h, wherein, the flue gas desulfurization treatment device The gas concentration at the inlet and outlet is detected by a flue gas analyzer to obtain a sulfur-containing slurry;

[0077] Suction filtering the sulfur-containing slurry to obtain a solid phase and a liquid phase;

[0078] Put the obtained liquid phase in a dialysis bag with a molecular weight cut-o...

Embodiment 2

[0085] Mix 10 g of steel slag with a median particle size of 3.15 μm and 100 mL of water, and carry out a hydrolysis reaction at 50 ° C and 380 rpm for 10 min to obtain a slurry;

[0086] The simulated flue gas is prepared by the simulated flue gas system, where SO 2 and O 2 The volume ratio is 1:1, SO 2 and SO 2 Gas distribution balance gas N 2 The volume ratio is 5:95, O 2 and O 2 Gas distribution balance gas N 2 The volume ratio of the slurry is 25:75, and the flue gas is passed into the device equipped with the slurry at a flow rate of 1.2mL / min, and the desulfurization treatment of the flue gas occurs in the device for 1 hour, wherein, the inlet of the flue gas desulfurization treatment device The gas concentration at the outlet is detected by a flue gas analyzer to obtain a sulfur-containing slurry;

[0087] Suction filtering the sulfur-containing slurry to obtain a solid phase and a liquid phase;

[0088] Put the obtained liquid phase in a dialysis bag with a mo...

Embodiment 3

[0091] Mix 10 g of steel slag with a median particle size of 4.63 μm and 50 mL of water, and carry out a hydrolysis reaction at 60°C and 380 rpm for 10 minutes to obtain a slurry;

[0092] The simulated flue gas is prepared by the simulated flue gas system, where SO 2 and O 2 The volume ratio is 1:1, SO 2 and SO 2 Gas distribution balance gas N 2 The volume ratio is 5:95, O 2 and O 2 Gas distribution balance gas N 2 The volume ratio of the slurry is 25:75, and the flue gas is passed into the device equipped with the slurry at a flow rate of 1.2mL / min, and the desulfurization treatment of the flue gas occurs in the device for 1 hour, wherein, the inlet of the flue gas desulfurization treatment device The gas concentration at the outlet is detected by a flue gas analyzer to obtain a sulfur-containing slurry;

[0093] Suction filtering the sulfur-containing slurry to obtain a solid phase and a liquid phase;

[0094] Put the obtained liquid phase in a dialysis bag with a m...

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Abstract

The invention belongs to the technical field of industrial waste resourceful treatment, and particularly relates to a method for synergistically extracting silica gel by removing SO2 in flue gas through steel slag. The invention provides a method for synergistically extracting silica gel by using steel slag to remove SO2 in flue gas, which comprises the following steps: mixing steel slag and water, and carrying out hydrolysis reaction to obtain slurry; the slurry is in contact with flue gas to be treated, the flue gas is subjected to desulfurization treatment, sulfur-containing slurry is obtained, and the flue gas comprises SO2 and O2; performing solid-liquid separation on the sulfur-containing slurry to obtain a solid-phase product and a liquid-phase product; and carrying out dialysis purification on the liquid-phase product, and drying the obtained dialysate to obtain the silica gel. According to the method, SO2 in the flue gas is treated by using the steel slag to synergistically extract the silica gel, so that the low-cost and high-efficiency flue gas desulfurization requirements of a thermal power plant are met, a silica gel product with a high additional value can be co-produced, and resource utilization of the steel slag and the sulfur-containing flue gas is synchronously realized.

Description

technical field [0001] The invention belongs to the technical field of industrial waste resource treatment, in particular to a method for removing SO in flue gas by using steel slag 2 Method for synergistic extraction of silica gel. Background technique [0002] SO 2 It is the main pollutant released during the production process of thermal power plants, and the main cause of meteorological disasters such as acid rain, photochemical smog and greenhouse effect, which seriously affects the living environment and health of human beings. At present, limestone / lime-gypsum wet flue gas desulfurization technology is the most widely used and mature flue gas desulfurization technology in thermal power plants. As a natural ore, limestone has limited storage, and CaCO 3 in and SO 2 The reaction produces the greenhouse gas CO 2 . [0003] Steel slag is an alkaline industrial solid waste produced in the steelmaking process, which generally accounts for 10-15% of crude steel output,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16B01D53/50B82Y30/00B82Y40/00
CPCC01B33/16B01D53/502B82Y30/00B82Y40/00C01P2006/12C01P2006/14C01P2006/17
Inventor 马卓慧廖洪强程芳琴
Owner SHANXI UNIV
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