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Method for Enrichment and Stabilization of Mercury in Coal-fired Flue Gas Using Improved Desulfurizer with Blast Furnace Slag

A technology for blast furnace slag and coal-fired flue gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as ignoring mercury volatility, and achieve the effects of increasing mercury capture, reducing mercury content, and good inhibition

Active Publication Date: 2021-10-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies mainly focused on the toxicity of mercury leaching from waste, but ignored the volatility of mercury

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In the present embodiment, a method of stabilizing and enriching blast furnace slag to an improved desulfurization agent using mercury from flue gas, comprising the steps of:

[0016] . A lime - slurry Limestone FGD desulfurization agent as used as the blast furnace slag modifier, a mass ratio of blast furnace slag and a dry FGD desulfurizer: the proportion of blast furnace slag and lime 2 - limestone slurry were mixed to form iron -FGD mixture of manganese oxide sorbent system used in the mass percentage of blast furnace slag, CaO 35%, the percentage content by mass of iron oxide / iron oxide was 0.2%, the mass percentage of the manganese oxide is 0.1 %;

[0017] b desulfurization prepared in said step a - Mercury Capture composite slurry for the application of desulphurization and enriched flue gas and for mercury absorption.

[0018] This embodiment will be added to blast furnace slag lime - limestone slurry, the use of blast furnace slag CaO, increasing the effective co...

Embodiment 2

[0042] This embodiment is substantially the same as the examples, in particular

[0043] In the present embodiment, a desulfurizing agent using a blast furnace slag improved the enrichment and stability of mercury in the coal-fired flue gas, including the steps of:

[0044] a. Using lime-limestone slurry as an FGD desulfurizer, a blast furnace slag is used as a modified agent, and the blast furnace slag and lime-limestone slurry is mixed according to the ratio of the blast furnace slag and dry base FGD desulfurizer, and form iron. Manganese Oxide-FgD Desulfulfur Mixture, the mass percentage of CaO in the blast furnace slag is 50%, the mass content of iron oxide / oxide iron oxide is 1.6%, and the mass content of manganese oxide is 0.7. %;

[0045] b. The desulfurization-mercury-mercury capture composite slurry prepared in the step A is used in coal-fired flue gas desulfurization and is used to coal the enrichment and absorption of mercury in coal flue gas.

[0046] In the wet meth...

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PUM

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Abstract

The invention discloses a method for enriching and stabilizing mercury in coal-fired flue gas by using a desulfurizer improved by blast furnace slag. The mass ratio of the desulfurizer is 1: (2-3), the blast furnace slag and the desulfurizer slurry are mixed to form an iron-manganese oxide-desulfurizer mixture system, and the desulfurization-mercury capture composite slurry is prepared; then the desulfurization-mercury capture The composite slurry is used for desulfurization of coal-fired flue gas, and for the enrichment and absorption of mercury in coal-fired flue gas. The present invention mixes blast furnace slag and desulfurizer to prepare desulfurization slurry, which is used for flue gas desulfurization of coal-fired power plants. The leaching toxicity and volatilization tests of mercury in the obtained desulfurization material show that the mercury in the desulfurization material is more stable than ordinary desulfurization gypsum. The concentration of leached mercury is reduced, the volatilization release rate is greatly reduced, and the inhibition effect on environmental mercury pollution sources is strong, which is of great significance to the protection of the atmospheric environment.

Description

Technical field [0001] The present invention relates to an auxiliary flue gas mercury capture and collection methods, and more particularly to an enhanced capture of mercury from flue gas and the collection method, emissions control technology applied to environmental engineering. Background technique [0002] Mercury in coal combustion into the atmosphere after the environment is one of the major sources of mercury contamination, after combustion of coal, with the mercury in the flue gas into a dust removal system and subsequent desulfurization system, the remaining flue gas emissions into the atmosphere. Mercury in coal combustion in the coal, most of the ash is trapped dust removal system, a portion into the gypsum desulfurization system, the remaining small portion with the flue gas into the atmosphere. Prior studies have focused on mercury leaching of toxic waste, but ignores volatile mercury. [0003] Leached for gypsum method using acetate buffer solution of nitric acid an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/64
CPCB01D53/502B01D53/64B01D53/80B01D2257/602
Inventor 刘自兴梁冠男郝莹潘赟张佳钱光人
Owner SHANGHAI UNIV
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