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Method for regenerating desulfurizer treating ferric hydroxide as active component

A technology of iron oxyhydroxide and active components, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve the problem of low oxidation efficiency of waste powder, reducing oxidation efficiency of waste powder, and waste of amorphous iron oxyhydroxide. It can improve the oxidation efficiency, improve the regeneration efficiency, and improve the solubility of the problem of reducing the regeneration efficiency of the agent.

Active Publication Date: 2013-07-24
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, since the oxygen-containing gas is not easily soluble in water, except for a small amount of dissolved oxygen dissolved in the suspension that will oxidize with the waste agent powder, a large amount of remaining oxygen is insoluble in the suspension , form a gas-liquid interface with the suspension, and the waste agent powder at the gas-liquid interface is oxidized when it contacts the interface oxygen, while the waste agent powder in the suspension that cannot contact dissolved oxygen and interface oxygen cannot be oxidized, thereby reducing the The oxidation efficiency of waste agent powder; and as the oxidation proceeds, the generated elemental sulfur will also float up to the gas-liquid interface, occupying part of the gas-liquid interface, so that less waste agent powder that can contact the interface oxygen, and the waste agent The oxidation efficiency of the powder is lower, so that the regeneration efficiency of the amorphous iron oxyhydroxide waste agent is reduced; and a regeneration method of the desulfurizer with iron oxyhydroxide as the active component that can improve the regeneration efficiency of the desulfurizer waste agent is proposed

Method used

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  • Method for regenerating desulfurizer treating ferric hydroxide as active component

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take α-iron oxyhydroxide as the active component desulfurizer waste agent 2kg, use a mixer to crush it into a powder with a particle size of 30 mesh, add water to the waste agent powder to form a suspension containing 2.5wt.% waste agent powder, Sodium hydroxide solution is added in the suspension, and the pH value of the suspension is adjusted to be 7.5; In the suspension, the oxygen-containing gas with a flow rate of 50L / h is passed into the suspension, and the oxygen-containing gas is a mixed gas of oxygen and air. The volume ratio of oxygen and air in the mixed gas is 6: 1, react for 5 hours, the iron sulfide in the suspension is oxidized into iron oxyhydroxide and sulfur element; then pass into the air in the suspension, the sulfur element overflows and After being separated, the remaining suspension containing precipitated ferric oxyhydroxide was filtered and washed with a centrifuge, and the filter cake was dried at -5°C for 24 hours to obtain ferric oxyhydroxide....

Embodiment 2

[0030] Get 4kg of desulfurizer waste agent with β-iron oxyhydroxide as the active component, use a mixer to crush it into a powder with a particle size of 40 mesh, add water to the waste agent powder to form a suspension containing 30wt.% waste agent powder, and add Potassium hydroxide is added to the suspension to adjust the pH of the suspension to 11; the flow rate of the suspension is 400L / h of oxygen-containing gas, and the oxygen-containing gas is a mixed gas of oxygen and air. The volume ratio of oxygen and air in the medium is 2:1, and react for 5 hours to oxidize the iron sulfide in the suspension into iron oxyhydroxide and sulfur element; then pass air into the suspension, and the sulfur element overflows and is separated , the remaining suspension containing iron oxyhydroxide precipitation was filtered and washed by a centrifuge, and the filter cake was dried at 120° C. for 3 hours to obtain iron oxyhydroxide.

[0031] The sulfur capacity of the iron oxyhydroxide des...

Embodiment 3

[0033] Take β-iron oxyhydroxide as the desulfurizer waste agent 5kg of active component, utilize the mixing mill to be broken into particle size and be the powder of 80 meshes, add water to the waste agent powder and be made into the suspension that contains 25wt.% waste agent powder, to Lithium hydroxide is added to the suspension to adjust the pH of the suspension to 9; an oxygen-containing gas with a flow rate of 300L / h is introduced into the suspension, and the oxygen-containing gas is a mixed gas of oxygen and air. The volume ratio of oxygen and air is 3:1, react for 5 hours, the iron sulfide in the suspension is oxidized into iron oxyhydroxide and sulfur element; then air is passed into the suspension, the sulfur element overflows and is separated, The remaining suspension containing iron oxyhydroxide precipitation was filtered and washed with a centrifuge, and the filter cake was dried at 100° C. for 4 hours to obtain iron oxyhydroxide.

[0034]The sulfur capacity of th...

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Abstract

The invention relates to a method for regenerating a desulfurizer treating ferric hydroxide as an active component. The method comprises the following steps: 1, crushing a waste desulfurizer treating ferric hydroxide as an active component to form powder, and adding water to the powder to prepare a suspension; 2, letting an oxygen-containing gas in the suspension for oxidizing iron sulfides in the suspension to form ferric hydroxide and element sulfur; and 3, adding a floating agent to the suspension to separate the element sulfur, filtering the separated element sulfur, washing the element sulfur, drying the element sulfur, fusing the element sulfur to obtain a sulfur ingot, and filtering, washing and drying precipitated ferric hydroxide to obtain regenerated ferric hydroxide. An alkaline solution is added to the suspension in step 1 to adjust the pH value of the suspension to be not lower than 7.5 in order to increase the solubility of the oxygen-containing gas in the suspension and improve the oxidization efficiency of the iron sulfides and the regeneration efficiency of the desulfurizer treating ferric hydroxide as the active component.

Description

technical field [0001] The invention specifically relates to a method for regenerating a desulfurizer with iron oxyhydroxide as an active component, and belongs to the field of desulfurizers. Background technique [0002] Both industrial gas and exhaust gas contain a large amount of sulfide. The sulfide in industrial gas will cause poisoning and deactivation of catalysts in industrial production, shorten the service life of catalysts, increase the frequency of catalyst replacement, and thus increase costs. The direct discharge of sulfide in the gas will cause harm to the environment and humans and animals, so the sulfide in both industrial gas and waste gas should be removed. The commonly used gas desulfurization method is the gas-solid method, that is, using a solid desulfurizer to perform physical adsorption or chemical reaction with the sulfide in the gas, so that the sulfide is fixed in the desulfurizer to purify the gas. [0003] At present, the usual desulfurizers can...

Claims

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Application Information

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IPC IPC(8): B01D53/96C01B17/06
Inventor 高群仰刘振义李新汪祥胜
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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