Modification method for semi-dry sintering flue gas desulfurization ash

A technology for sintering flue gas and desulfurization ash, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of content reduction and comprehensive utilization of desulfurization ash, and achieve content reduction, economic benefits and social benefits. , the effect of reducing production costs

Inactive Publication Date: 2015-05-06
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The modification method described in the present invention is aimed at the problem that the semi-dry method of sintering flue gas desulfurization ash is difficult to comprehensively utilize. Deionized water and oxalic acid solution are respectively used to impregnate and modify the desulfurization ash to reduce the content of S and Cl, and at the same time realize the Separate collection of S and Cl

Method used

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  • Modification method for semi-dry sintering flue gas desulfurization ash
  • Modification method for semi-dry sintering flue gas desulfurization ash
  • Modification method for semi-dry sintering flue gas desulfurization ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1). Use a 100-mesh sieve to sieve the semi-dry sintering flue gas desulfurization ash, and continue to sieve the remaining large particles after grinding until all of them pass through a 100-mesh sieve to obtain desulfurization ash I;

[0026] (2) Soak the desulfurized ash I obtained in step (1) in deionized water, wherein the ratio of the mass of desulfurized ash I to the volume of deionized water is 1g: 20ml; heat to 40°C and keep warm for 4h; filter, and the filtrate is Chloride salt solution, the filter residue is desulfurization ash II;

[0027] (3) Weigh 35g of oxalic acid, add 665ml of deionized water, heat to 60°C, and keep it warm for 15min to obtain an oxalic acid solution with a mass fraction of 5%;

[0028] (4) Soak the desulfurized ash II obtained in step (2) in the oxalic acid solution obtained in step (3), wherein the ratio of the mass of desulfurized ash II to the volume of the oxalic acid solution is 3g: 20ml; heat to 50°C, keep stirring 8h, in which ...

Embodiment 2

[0034] (1). Use a 100-mesh sieve to sieve the semi-dry sintering flue gas desulfurization ash, and continue to sieve the remaining large particles after grinding until all of them pass through a 100-mesh sieve to obtain desulfurization ash I;

[0035] (2) Soak the desulfurized ash I obtained in step (1) in deionized water, wherein the ratio of the mass of desulfurized ash I to the volume of deionized water is 1g: 10ml; heat to 60°C and keep warm for 3h; filter, and the filtrate is Chloride salt solution, the filter residue is desulfurization ash II;

[0036] (3) Weigh 70g of oxalic acid, add 630ml of deionized water, heat to 70°C, and keep it warm for 12min to obtain an oxalic acid solution with a mass fraction of 10%;

[0037] (4) Soak the desulfurized ash II obtained in step (2) in the oxalic acid solution obtained in step (3), wherein the ratio of the mass of desulfurized ash II to the volume of the oxalic acid solution is 1g: 20ml; heat to 60°C, keep stirring 5h, wherein ...

Embodiment 3

[0043] (1). Use a 100-mesh sieve to sieve the semi-dry sintering flue gas desulfurization ash, and continue to sieve the remaining large particles after grinding until all of them pass through a 100-mesh sieve to obtain desulfurization ash I;

[0044] (2) Soak the desulfurized ash I obtained in step (1) in deionized water, wherein the ratio of the mass of desulfurized ash I to the volume of deionized water is 1g︰40ml; heat to 70°C and keep warm for 2h; filter, and the filtrate is Chloride salt solution, the filter residue is desulfurization ash II;

[0045] (3) Weigh 140g of oxalic acid, add 560ml of deionized water, heat to 80°C, and keep it warm for 10min to obtain an oxalic acid solution with a mass fraction of 20%;

[0046] (4) Soak the desulfurized ash II obtained in step (2) in the oxalic acid solution obtained in step (3), wherein the ratio of the mass of desulfurized ash II to the volume of the oxalic acid solution is 1g: 40ml; heat to 50°C, keep stirring 6h, in which...

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Abstract

The invention discloses a modification method for semi-dry sintering flue gas desulfurization ash. The modification method comprises steps of grinding and sieving the semi-dry sintering flue gas desulfurization ash, then steeping in deionized water for modification, and steeping in 5-20% oxalic acid for modification. The modification method not only can well modify the desulfurization ash, lower the content of Cl and S in desulfurization ash, and collect and reuse S and Cl in the desulfurization ash so as to alleviate the problem of deficiency of S and Cl to a certain degree; comprehensive utilization of the desulfurization ash in construction materials such as cement and concrete can be realized so as to lower the production cost of the construction materials, and the desulfurization ash can also be used in medical treatment. The modification method is simple, efficient, and low in cost, and has a broad prospect.

Description

technical field [0001] The invention belongs to the field of resource environmental protection, and in particular relates to a modification method of semi-dry sintering flue gas desulfurization ash. Background technique [0002] SO during sintering 2 emissions account for approximately 60-70% of emissions from steel production systems. In recent years, the country's sintering flue gas SO 2 More stringent policies have been introduced for emissions. Therefore, to control SO in the production process of sintering machine 2 emission of iron and steel enterprises, SO 2 The focus of pollution control, and at the same time for the realization of SO 2 Emission reduction targets are of great significance. As a key environmental protection task of the national and local governments, it is imperative for iron and steel enterprises to construct sintering flue gas desulfurization projects. [0003] In the context of environmental protection and economy, many large sintering machi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/50
Inventor 刘清才刘浪丁健孔明朱博洪兰苑培李林周强
Owner CHONGQING UNIV
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