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Method for treating desulfurization ash by fluidized-bed furnace

The technology of desulfurization ash and boiling furnace is applied in the field of comprehensive utilization of metallurgical solid waste resources.

Inactive Publication Date: 2020-02-11
SHAGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because desulfurization ash has the characteristics of very unstable composition, alkaline, easy to decompose, and easy to expand after absorbing water, it is very difficult to comprehensively utilize desulfurization ash. At present, the common treatment methods of desulfurization ash are stacking and landfill, which not only pollutes the environment and occupies land , there is also a very large security risk
[0003] In recent years, there have been many studies on the utilization of desulfurization ash resources, but the actual application is not mature, and there are many problems. For example, using desulfurization ash for sintering ore blending will affect the stability of sintering machine operation and deteriorate the quality of sintering ore; Ash is used to prepare various brick products and concrete, which will cause volume expansion and cracking; using desulfurized ash for soil restoration will cause secondary pollution and other problems. Therefore, the development of desulfurized ash is efficient, harmless, stable and feasible. Resource utilization technology is of great significance

Method used

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  • Method for treating desulfurization ash by fluidized-bed furnace

Examples

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Embodiment 1

[0019] The present invention will be further explained below in conjunction with the accompanying drawings.

[0020] The desulfurization ash used in this example is a dry desulfurization ash with a moisture content of less than 10%. The main components of the dry desulfurization ash are shown in Table 1.

[0021] Table 1. Main components of dry desulfurization ash (%)

[0022] SiO 2

Al 2 o 3

MgO NaO 2

K 2 o

CaO SO 3

Fe 2 o 3

Cl Desulfurization ash 0.78 0.41 3.69 0.279 2.75 51.4 30.5 1.12 4.93

[0023] like figure 1 As shown, a method for treating desulfurization ash in a fluidized furnace, the dry desulfurization ash is sent into the fluidized furnace through pneumatic conveying, and the reaction gas is introduced (the reaction gas is obtained by mixing and burning coal gas and air in a certain proportion, and the gas is mixed in the air Medium combustion, oxygen consumption, so as to control the oxygen...

Embodiment 2

[0026] The desulfurization ash used in this example is the wet desulfurization ash after the dry desulfurization ash used in Example 1 has been dampened, and the moisture content of the wet desulfurization ash is 30%.

[0027] A method for treating desulfurization ash in a fluidized furnace. The wet desulfurization ash is dried (drying temperature is 200-300°C), crushed, and ground to obtain desulfurized ash with a particle size of about 100 mesh, and then sent into the fluidized ash by pneumatic transportation. , the temperature of the boiling furnace is controlled at 1000°C, the oxygen content of the reaction gas is controlled at 5%, the desulfurization ash is fully oxidized and roasted, and the calcium sulfite in the desulfurization ash is oxidized into calcium sulfate. The oxidized desulfurization ash is cooled and passed through The cyclone dust collector is used for material recovery. After testing, the cyclone dust collector obtains CaSO in the material (desulfurization ...

Embodiment 3

[0029] A method for treating desulfurized ash in a fluidized furnace. The dry desulfurized ash (same as in Example 1) is sent into the fluidized furnace through pneumatic transportation. The temperature of the fluidized furnace is controlled at 800°C, and the oxygen content of the reaction gas is controlled at 10%. The desulfurized ash is fully desulfurized. Oxidation roasting, the calcium sulfite in the desulfurization ash is oxidized to calcium sulfate, the oxidized desulfurization ash is cooled, and the material is recovered through the cyclone dust collector. After testing, the cyclone dust collector obtains CaSO in the material (desulfurization ash). 4 The content is greater than 90%, and the CaO content is less than 10%. The above recovered desulfurization ash was mixed with blast furnace slag to prepare slag micropowder according to different dosages, the dosages were 3%, 4%, 5% and 6% respectively. After testing, the blended amount of 3% slag powder has good performanc...

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Abstract

The invention provides a method for treating desulfurization ash by a fluidized-bed furnace. The method comprises the steps of feeding the desulfurization ash to the fluidized-bed furnace, subjectingthe desulfurization ash to a fluidized oxidation roasting reaction in the fluidized-bed furnace under the shielding of an reaction atmosphere, then, cooling the oxidation-roasted desulfurization ash,and then, carrying out material recovery through a cyclone separator. The recovered desulfurization ash can also be doped into blast-furnace water granulated slag so as to prepare slag micropowder. According to the method, unstable calcium sulfite in the desulfurization ash is oxidated into stable calcium sulfate through reasonably controlling a reaction temperature and a reaction atmosphere of the fluidized-bed furnace, and the desulfurization ash treated by the fluidized-bed furnace can be doped into the blast-furnace water granulated slag so as to prepare the slag micropowder which is applied to cement concrete industry, so that the problem in treatment of the desulfurization ash is solved, and a remarkable economic benefit can also be created.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of metallurgical solid waste resources, and relates to a method for treating desulfurization ash in a fluidized fluidized furnace. Background technique [0002] Due to the advantages of high desulfurization efficiency, short process flow, small footprint, and low investment, the semi-dry desulfurization process is widely used in the flue gas desulfurization projects of small and medium-sized generating units in my country and sintering plants of some iron and steel enterprises. The semi-dry desulfurization process uses quicklime as the raw material, which is made into a slurry, and fully contacts and reacts with the sulfur-containing flue gas in the absorption tower to achieve the removal of SO in the flue gas. 2 the goal of. The biggest disadvantage of the semi-dry desulfurization process is that a large number of by-products will be produced after the flue gas is desulfurized, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/06C04B18/14C04B7/24
CPCC04B7/24C04B18/062C04B18/141C04B20/04Y02W30/91Y02P40/10
Inventor 毛瑞茅沈栋王飞苏航
Owner SHAGANG GROUP