A kind of composite desulfurization and mercury removal agent and preparation method thereof

A mercury removal agent and mercury removal technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as the impact of mercury organisms, easy volatilization, and atmospheric environmental pollution, so as to improve adsorption capacity and promote activity. Improve the effect of low production cost

Inactive Publication Date: 2019-07-09
YINYU MINERALS WUCHUAN AUTONOMOUS COUNTY
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Problems solved by technology

[0002] Coal is the main energy resource in our country; coal combustion is accompanied by the emission of waste gas, and coal contains a large amount of sulfide and mercury, mercury is highly toxic and easy to volatilize, in the process of coal combustion, accompanied by flue gas Volatilizes into the environment, causing air pollution; not only that, mercury will also have a serious impact on organisms, especially destroying the metabolic function of biological cells; sulfide will enter in the form of sulfur dioxide gas during coal combustion In the environment, there is a large amount of sulfur dioxide in the air. As the rain falls, sulfur dioxide, oxygen and water form acid rain and fall to the surface, causing damage to surface crops, vegetation, industrial factories and mines, etc., which has brought great damage to production and life. Therefore, it is necessary to desulfurize and demercurize the flue gas emitted from coal combustion
[0003] At present, there are many treatment technologies for flue gas desulfurization and mercury removal, but most of them use separate desulfurization or demercury treatment agents for stepwise desulfurization and mercury removal, which not only results in a longer desulfurization and mercury removal cycle, but also desulfurization and mercury removal costs. Based on this, a treatment method that simultaneously desulfurizes and demercures appears in the prior art, and the selection of raw materials for desulfurization and demercury reduces the cost of desulfurization and demercury. For example, the patent application number is 201610149557, using low Grade pyrolusite is used as a raw material, so that during the contact reaction process with the flue gas, the removal of sulfur dioxide and mercury in the flue gas can be achieved, the content of sulfur dioxide, mercury, etc. in the flue gas emission process can be reduced, and the cost can be reduced; however, this treatment method It can only increase the removal rate of sulfur dioxide to about 70%, and the removal rate of mercury to about 64%, so that the flue gas still contains a large amount of sulfide and mercury components. After being discharged into the environment, serious Beyond the self-purification ability of the environment, it will still cause a great degree of pollution to the environment

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preparation example Construction

[0026] In some embodiments, the preparation method of the composite desulfurization and mercury removal agent comprises the following steps:

[0027] (1) Mix potassium chromate, calcium manganate, and cobalt oxide evenly, add water so that the water content is 15-27%, and under vacuum conditions, adopt a temperature of 100-120° C. for 20-40 minutes;

[0028] (2) Prepare the pyrolusite into powder, and add the material of step (1) into the pyrolusite powder, add water and knead it into mud, prepare the mud into particles with a diameter of 0.04-1.7mm, and place it in the presence of nitrogen , at 150-240°C for 0.8-1.3h, then add ethylenediamine.

[0029] In some embodiments, in the steps (1) and (2), the water contains potassium hydroxide or lithium hydroxide with a mass concentration of 3-7%. The alkali metal activates the manganese component in the manganese-based desulfurization and mercury removal agent to increase the desulfurization and mercury removal rate.

[0030] In...

Embodiment 1

[0033] Composite desulfurization and mercury removal agent, raw material components by weight are 20kg of pyrolusite, 1kg of potassium chromate, 0.2kg of calcium manganate, 0.1kg of cobalt oxide, and 1kg of ethylenediamine.

[0034] The preparation method comprises the following steps:

[0035] (1) Mix potassium chromate, calcium manganate, and cobalt oxide evenly, add water to make the water content 15%, and treat at 100°C for 20 minutes under vacuum conditions;

[0036] (2) Prepare the pyrolusite into powder, and add the material of step (1) into the pyrolusite powder, add water and knead it into mud, prepare the mud into particles with a diameter of 0.04mm, and place it under the condition of nitrogen, Treat at 150°C for 0.8h, then add ethylenediamine.

[0037] Treat the flue gas with the above-mentioned desulfurization and mercury removal agent according to the following application method: in the fixed bed reactor, fill the flue gas filter bed with the desulfurization an...

Embodiment 2

[0040] Composite desulfurization and mercury removal agent, raw material components by weight are 30kg of pyrolusite, 3kg of potassium chromate, 1.8kg of calcium manganate, 0.7kg of cobalt oxide, and 5kg of ethylenediamine.

[0041] The preparation method comprises the following steps:

[0042] (1) Mix potassium chromate, calcium manganate, and cobalt oxide evenly, add water so that the moisture content is 27%, and treat at 120° C. for 40 minutes under vacuum conditions;

[0043] (2) After microwave radiation treatment, the pyrolusite is ground into 80-mesh powder, the microwave radiation power is 170W, and the microwave radiation time is 50min, and the materials in step (1) are added to the pyrolusite powder, and kneaded with water to form For mud, the mud is prepared into particles with a diameter of 1.7mm, placed in the presence of nitrogen, treated at 240°C for 1.3h, and ethylenediamine is added.

[0044] Treat the flue gas with the above-mentioned desulfurization and mer...

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Abstract

The invention relates to the technical field of desulfurization and demercuration and in particular relates to a compound desulfurization and demercuration agent and a preparation method thereof. The desulfurization and demercuration agent is prepared by compounding potassium chromate, calcium manganate, cobalt oxide, ethylenediamine and pyrolusite; the desulfurization and demercuration agent can be used for removing sulfur and mercury components from flue gas containing the sulfur and mercury components and the removal rate reaches 93 percent or above; the content of the sulfur and mercury components in the flue gas can be effectively reduced; the raw materials are easy to obtain and the preparation cost is relatively low; the desulfurization and demercuration cost of the flue gas is reduced.

Description

technical field [0001] The invention relates to the technical field of desulfurization and mercury removal, in particular to a composite desulfurization and mercury removal agent and a preparation method thereof. Background technique [0002] Coal is the main energy resource in our country; coal combustion is accompanied by the emission of waste gas, and coal contains a large amount of sulfide and mercury, mercury is highly toxic and easy to volatilize, in the process of coal combustion, accompanied by flue gas Volatilizes into the environment, causing air pollution; not only that, mercury will also have a serious impact on organisms, especially destroying the metabolic function of biological cells; sulfide will enter in the form of sulfur dioxide gas during coal combustion In the environment, there is a large amount of sulfur dioxide in the air. As the rain falls, sulfur dioxide, oxygen and water form acid rain and fall to the surface, causing damage to surface crops, veget...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/82B01D53/04B01D53/48B01D53/64
CPCB01D53/04B01D53/48B01D53/64B01D53/82B01D2251/60B01D2253/112B01D2253/1124B01D2253/204B01D2253/30B01D2257/30B01D2257/602B01D2258/0283
Inventor 李军旗陈庆唐道文赵平原王丽远鲁圣军黎志英刘利黄碧芳金会心陈肖虎
Owner YINYU MINERALS WUCHUAN AUTONOMOUS COUNTY
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