A novel process to recycle coal gasification fine slag by preparing Si-Fe-Al-Ca alloy

Wang, Yaoxuan; Zhang, Zhaoyang; Li, Lamei; Guo, Xiaolin; Wei, Donghui; Kong, Jian; Du, Hongwang; Wang, Hong; Zhuang, Yanxin; Xing, Pengfei

doi:10.1016/j.jenvman.2023.117681

Cited by 15 publications

(5 citation statements)

References 28 publications

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“…It was fixed at the point of interest for the sample for qualitative or quantitative analysis. This method has high accuracy and is used for component analysis of microstructure …”

Section: Methodsmentioning

confidence: 99%

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An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

Ma,

Zhu,

Guan

et al. 2024

ACS Sustainable Resour. Manage.

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Calcium carbide slag (CS) is an industrial solid waste produced via the coal-based poly(vinyl chloride) process, and its main component is calcium hydroxide (Ca(OH) 2 ) (85−95 wt %). CS can be used instead of calcium carbonate (CaCO 3 ) to produce calcium oxide (CaO), reducing carbon dioxide (CO 2 ) emissions. Our group has reported that CaO can be prepared at lower temperatures using CS compared with existing processing temperature, where the calcination temperature decreases from 1000 to 700 °C when CaCO 3 is replaced with CS during CaO production. A comparison of the carbon emissions of CS and CaCO 3 -based CaO preparation processes show that using CS to produce CaO reduces CO 2 emissions by 977.62 kg/t. Herein, the CS-based CaO is explained by controlling the CS calcination temperature and mineral transformation. CS completely decomposes into CaO at 492 °C. The calcination temperature of CS is between 400 and 600 °C, where CaCO 3 is formed via the reaction of carbon and Ca(OH) 2 and water in CS. Furthermore, when the carbon content in CS is >4%, CaCO 3 is formed. When the calcination temperature is 700 °C, CaCO 3 decomposes into CaO. As the temperature increases, the metallurgical activity of CS increases, and its strength decreases. When the temperature is 700 °C, the compressive strength of CaO is 21.94 MPa, its metallurgical activity is 379.85 mL, and the CaO content is 95.14%. This study provides a new method for preparing CaO to simultaneously reduce carbon emissions and in-situ recycle CS.

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“…It was fixed at the point of interest for the sample for qualitative or quantitative analysis. This method has high accuracy and is used for component analysis of microstructure …”

Section: Methodsmentioning

confidence: 99%

“…This method has high accuracy and is used for component analysis of microstructure. 33 2.3.3. Calcination Process Analysis.…”

Section: Characterization Techniques 231 Phase Analysismentioning

confidence: 99%

An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

Ma,

Zhu,

Guan

et al. 2024

ACS Sustainable Resour. Manage.

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“…During the gasification process, the organic material in coal is transformed into syngas, while the inorganic material remaining undergoes a transformation into liquid slag under high temperature and pressure. − As a result of the high temperature and pressure operation, most entrained-flow gasifiers adopt liquid continuous slagging. The fluidity of the slag plays a critical role in maintaining the stable operation of the gasifier during the slagging process, − because it has been reported that approximately 40% of unplanned shutdowns can be attributed to issues with slag fluidity. , To evaluate and guide the stable slagging operation of the gasifier for a long term and high efficiency, two key parameters, ash melting characteristics and viscosity–temperature characteristics, are considered. , …”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Zhang,

Song,

et al. 2024

Energy Fuels

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The stable fluidity of slag at a high temperature is crucial for the long-period operation of an entrained-flow gasifier. The diversity and difference of coal ash make it difficult to meet the requirements for stable slagging in a gasifier. Consequently, coal blending or adding flux has been employed in the industry to improve the fluidity of coal ash slag. As a carbon-containing matrix, industrial solid waste is a kind of energy substance. Utilizing existing industrial gasifiers to blend combustion of industrial solid waste can not only transform industrial solid waste into fuel but also improve the entrained-flow gasifier slagging performance using the unique ash chemical composition of industrial solid waste. Therefore, sorting out the effect of industrial solid waste on coal ash slag fluidity can not only clarify the regulating mechanism of coal ash slagging but also provide some theoretical support for the large-scale consumption of industrial solid waste. In this review, the effects of acid-and alkali-rich industrial solid wastes and coal co-gasification on coal ash slag fluidity were reviewed from the perspectives of ash melting characteristics and viscosity−temperature characteristics, and the effect mechanism of SiO 2 , Al 2 O 3 , SiO 2 / Al 2 O 3 (S/A), CaO, Fe 2 O 3 , and CaO−Fe 2 O 3 (Ca−Fe) compound fluxes on coal ash slag fluidity were elaborated from the viewpoint of mineral evolution and microstructure. Meanwhile, studies on the ash slag fluidity during the co-gasification of industrial solid waste and coal were prospected, which could afford theoretical guidance for the stable slagging of an entrained-flow gasifier and the resourceful treatment of industrial solid waste.

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“… 1 At elevated temperatures, coal reacts with either oxygen or water vapor to generate gaseous byproducts including CO, H 2 , and CH 4 . 2 A significant quantity of coal gasification slag (CGS) is produced during this process, with an annual output of approximately 35 million tons in China alone. 3 Currently, most of this waste is landfilled and deposited in open areas, which not only takes up a lot of land resources but also puts a lot of pressure on environmental management.…”

Section: Introductionmentioning

confidence: 99%

The adsorption properties and mechanisms of magnetic carbon–silicon composites in situ prepared from coal gasification fine slag

Sun,

Pan,

Shen

et al. 2024

RSC Adv.

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A novel process to recycle coal gasification fine slag by preparing Si-Fe-Al-Ca alloy

Cited by 15 publications

References 28 publications

An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

The adsorption properties and mechanisms of magnetic carbon–silicon composites in situ prepared from coal gasification fine slag

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