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Method for preparing sulfuric acid by treating semi-dry desulfurization ash and high-sulfur iron material through sintering process

A semi-dry desulfurization and high-sulfur iron technology, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of waste of resources, inability to use cement, damage the environment, etc., and achieve the effect of improving the recovery rate

Pending Publication Date: 2021-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfur content in semi-dry desulfurization ash is relatively high, and it contains more free calcium oxide, which continuously generates Ca(OH) during the long-term hydration process. 2 , the volume continues to expand, which affects the stability of use. It cannot be used directly as cement or the amount of use is small, which limits its resource utilization.
Most of the desulfurization ash can only be piled up and disposed of in landfill, which not only damages the environment but also occupies land resources
At the same time, a large amount of resources such as calcium and sulfur in the semi-dry desulfurization ash have not been utilized in large quantities, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, take semi-dry desulfurization ash with a mass percentage of sulfur of 12.9%, high-sulfur iron material with a mass percentage of sulfur of 0.2%, and quicklime with a mass percentage of CaO of 82% and an activity of 250mL from a power plant. 45%, 51%, and 4%, respectively, and 5% of coke powder with a fixed carbon mass percentage of 80% was added, and the ingredients were mixed and granulated uniformly to obtain 5mm pellets. The balls are clothed sequentially, and the thickness of the cloth is 800mm. After the cloth is finished, ignite under the surface of the mixture, the ignition temperature is 1050 ° C, and the time is 2 minutes. After the fuel on the surface of the material layer is ignited and burned, it enters the sintering stage, the sintering speed is 16mm / min, and the combustion zone gradually migrates from the upper part to the lower material layer until the end of the combustion process, and the sintered material is obtained; the sintering process produ...

Embodiment 2

[0037] First, take semi-dry desulfurization ash with a mass percentage of sulfur of 13.1%, high-sulfur iron material with a mass percentage of sulfur of 0.9%, and quicklime with a mass percentage of CaO of 88% and an activity of 280mL from a steel plant. The contents are respectively 50%, 45%, 5%, and 8% of anthracite with a fixed carbon mass percentage of 75% is added, the ingredients are mixed, and the granules are uniformly granulated to obtain 4mm pellets. The balls are clothed sequentially, and the thickness of the cloth is 600mm. After the cloth is finished, ignite under the surface of the mixture, the ignition temperature is 1100 ° C, and the time is 2 minutes. After the fuel on the surface of the material layer is ignited and burned, it enters the sintering stage, the sintering speed is 20mm / min, and the combustion zone gradually migrates from the upper part to the lower material layer until the end of the combustion process, and the sintered material is obtained; the ...

Embodiment 3

[0039] First, take semi-dry desulfurization ash with a sulfur mass percentage content of 12.9%, high-sulfur iron material with a sulfur mass percentage content of 2.3%, and quicklime with a CaO mass percentage content of 90% and an activity of 290ml from a steel plant. 15%, 82%, and 3%, respectively, and 4% of coke powder with a fixed carbon mass percentage of 80% was added, and the ingredients were mixed and uniformly granulated to obtain 6mm pellets. The balls are clothed sequentially, and the thickness of the cloth is 1000mm. After the cloth is finished, ignite under the surface of the mixture, the ignition temperature is 1200°C, and the time is 1min. After the fuel on the surface of the material layer is ignited and burned, it enters the sintering stage, the sintering speed is 14mm / min, and the combustion zone gradually migrates from the upper part to the lower material layer until the end of the combustion process, and the sintered material is obtained; the high concentra...

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Abstract

The invention discloses a method for preparing sulfuric acid by treating semi-dry desulfurization ash and a high-sulfur iron material through a sintering process. According to the method, semi-dry desulfurization ash, a high-sulfur iron material, quick lime and solid fuel are proportioned, mixed and granulated to obtain a ball material, the ball material is sequentially subjected to material distribution, ignition and sintering, high-sulfur-dioxide-concentration flue gas generated in the middle of a sintering machine in the sintering process is used for preparing sulfuric acid, and meanwhile a sintered material is obtained. According to the method, all-component recycling of the semi-dry desulfurization ash and efficient utilization of the high-sulfur iron material are achieved, sulfur dioxide flue gas generated in the sintering process is concentrated in the middle of the sintering machine and used for preparing sulfuric acid, the content of sulfur dioxide in flue gas generated in other parts of the sintering machine is low, and the flue gas after acid making can meet the emission requirement after being denitrated.

Description

technical field [0001] The invention relates to a method for treating semi-dry desulfurization ash, in particular to a method for synergistically resource-processing semi-dry desulfurization ash to prepare sulfuric acid by using iron ore sintering process, and belongs to the technical field of solid waste treatment. Background technique [0002] Currently, flue gas desulfurization technologies are mainly wet desulfurization technology, dry desulfurization technology and semi-dry desulfurization technology. Compared with the former technology, the dry and semi-dry desulfurization technology has the advantages of high desulfurization efficiency, short process flow, low investment, and small footprint. The semi-dry desulfurization process has obvious advantages and is widely used in iron and steel metallurgy, thermal power generation and other industries. [0003] The main components of the desulfurization ash produced by the semi-dry desulfurization process are: free calcium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/50C01B17/76C22B1/16
CPCC01B17/506C01B17/50C01B17/76C22B1/16
Inventor 甘敏范晓慧刘林程季志云孙增青陈许玲黄晓贤袁礼顺
Owner CENT SOUTH UNIV
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