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A method for reclaiming sulfur on iron oxyhydroxide and application of iron oxyhydroxide for sulfur removal

A technology of iron oxyhydroxide and iron oxide, which is applied in the direction of iron oxide/iron hydroxide, chemical instruments and methods, separation methods, etc., and can solve the problems such as the decline of desulfurization ability of iron oxyhydroxide

Active Publication Date: 2020-10-27
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Therefore, the technical problem to be solved in the present invention is to overcome the defect that the desulfurization ability of iron oxyhydroxide decreases in the existing method for reclaiming sulfur on iron oxyhydroxide, and then provide a method for reclaiming sulfur from sulfur-containing iron oxyhydroxide

Method used

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  • A method for reclaiming sulfur on iron oxyhydroxide and application of iron oxyhydroxide for sulfur removal
  • A method for reclaiming sulfur on iron oxyhydroxide and application of iron oxyhydroxide for sulfur removal
  • A method for reclaiming sulfur on iron oxyhydroxide and application of iron oxyhydroxide for sulfur removal

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Embodiment 1

[0036] This embodiment provides a method for recovering sulfur on iron oxyhydroxide, which includes the following steps:

[0037] (1) Dry the sulfur-containing iron oxyhydroxide under normal pressure at 55°C until its water content is 5wt%;

[0038] (2) Mix the dried sulfur-containing iron oxide oxyhydroxide and 1,3,5-trimethylbenzene at a mass ratio of 1:10 at 90℃ for 2h, and separate the solid and liquid to obtain a sulfur-containing solvent and sulfur removal Iron oxyhydroxide

[0039] (3) Dry the iron oxyhydroxide from which sulfur is removed at 65°C to obtain iron oxyhydroxide A; the sulfur-containing solvent is cooled and crystallized at a temperature of 5°C, and solid-liquid separation is performed to obtain sulfur A.

Embodiment 2

[0041] This embodiment provides a method for recovering sulfur on iron oxyhydroxide, which includes the following steps:

[0042] (1) First centrifugal treatment of sulfur-containing iron oxyhydroxide to remove water initially, and then dry the sulfur-containing iron oxyhydroxide at a temperature of 45°C and a pressure of 20Kpa to a water content of 0.1wt%;

[0043] (2) Stir and mix the dried sulfur-containing iron oxyhydroxide and methylcyclohexane at a mass ratio of 1:30 at 80°C for 1 hour, and separate the solid and liquid to obtain the first sulfur-containing solvent and the first iron oxyhydroxide;

[0044] (3) The first iron oxyhydroxide and methylcyclohexane were stirred and mixed at 80° C. for 1 hour at a mass ratio of 1:30, and solid-liquid separation was performed to obtain a second sulfur-containing solvent and a second iron oxyhydroxide;

[0045] (4) Mix the second iron oxyhydroxide and methylcyclohexane at a mass ratio of 1:30 at 80° C. for 1 h, and separate solid-liquid t...

Embodiment 3

[0048] This embodiment provides a method for recovering sulfur on iron oxyhydroxide, which includes the following steps:

[0049] (1) Centrifugal treatment of sulfur-containing iron oxyhydroxide, preliminary dewatering, and then drying the sulfur-containing iron oxyhydroxide at a temperature of 85°C and a pressure of 80Kpa to a water content of 4wt%;

[0050] (2) The dried sulfur-containing iron oxyhydroxide and trichloroethane were stirred and mixed at 50°C for 3 hours at a mass ratio of 1:7, and solid-liquid separation was performed to obtain the first sulfur-containing solvent and the first iron oxyhydroxide;

[0051] (3) The first ferric oxyhydroxide and trichloroethane were stirred and mixed at a mass ratio of 1:7 at 50°C for 3 hours, and solid-liquid separation was performed to obtain a second sulfur-containing solvent and a second ferric oxyhydroxide;

[0052] (4) Mix the second iron oxyhydroxide and trichloroethane at a mass ratio of 1:7 at 50°C for 3 hours, and separate the so...

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Abstract

The invention provides a method for recovering sulphur on iron oxyhydroxide and the application of the sulphur removed iron oxyhydroxide. On one side, the vacuum degree and the temperature for dryingthe sulphur-containing iron oxyhydroxide and the sulphur removed iron oxyhydroxide are strictly controlled to avoid the loss of the hydroxyl in the iron oxyhydroxide and guarantee the desulfurizationcapability of the iron oxyhydroxide; on the other side, the water content of the sulphur-containing iron oxyhydroxide is strictly controlled to effectively guarantee the desulfurization capability ofthe iron oxyhydroxide and the purity of the recovered sulphur on the premise of efficiently separating the sulphur from iron oxyhydroxide; the reason is that the water content of the iron oxyhydroxideis too high, the iron oxyhydroxide is dispersed into tiny particles in an organic solvent, then the desulfurization capability of the iron oxyhydroxide is reduced, and the recovered sulphur also contains a large quantity of iron elements.

Description

Technical field [0001] The invention relates to the technical field of iron oxyhydroxide, and belongs to a technology for separating sulfur from the surface of iron oxyhydroxide without destroying the structure of the iron oxyhydroxide. Background technique [0002] Iron oxyhydroxide is neutral, and the main crystal forms include α-FeooH, β-FeooH, γ-FeooH and amorphous iron oxyhydroxide. It is one of the important desulfurizers, especially when it contains higher concentrations of CO 2 When the sulfur-containing gas is desulfurized, it has an irreplaceable advantage. [0003] The desulfurization principle of iron oxyhydroxide is: the hydroxyl (-OH) and H in iron oxyhydroxide 2 After the dissociation of S, the HS is replaced to produce FeSSH, so as to achieve the effect of desulfurization. When the iron oxyhydroxide reaches its sulfur capacity, oxygen is injected into it to regenerate the iron oxyhydroxide, which can then be recycled. The specific desulfurization and regeneration re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/027C01G49/02B01D53/81B01D53/52B01D53/96
CPCB01D53/52B01D53/81B01D53/96C01B17/027C01G49/02
Inventor 孙培志熊杰明黄龙张志民
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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