Research on grinding and flotation decarbonization of coal gasification fine slag
Journal Title: Energy Environmental Protection - Year 2023, Vol 37, Issue 6
Abstract
Coal gasification fine slag is a solid waste generated during the coal gasification process. Typically, it is mainly disposed of through landfill or stacking and has not yet been widely utilized on a large-scale industrial level. This study focused on the dry coal gasification fine slag obtained from a specific location in the North of China, considering its characteristics such as high ash content, high porosity, and continuous components. In order to fully dissociate the residual carbon and vitreous body, the ALC-1.5 grinder was employed for pre-grinding after identifying the material composition, particle size composition, surface morphology, and internal structure of the slag. Subsequently, flotation was utilized to separate carbon and ash in the gasification fine slag. Experimental results revealed that fine grinding significantly increased the exposure of the slag′s residual carbon surface, greatly enhancing its floatability. Using the secondary flotation process with a grinding time of 3.5 min, the roughing flotation progress employed 14 kg/t of 3# oil and 3 kg/t of Methyl Isobutyl Methanol (MIBC), while the scavenging flotation progress used 14 kg/t of 3# oil and 1.5 kg/t of MIBC. The resulting concentrate exhibited a rate of 3.20% with an ash content of 26.91%. The tailings had a mineral content of 37.67% and an ash content of 91.77%. The loss on ignition (LOI) was measured at 8.23%. Overall, the tailings product met the requirements of Class III fly ash.
Authors and Affiliations
XIE Weiwei*|School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), China, ZHANG Zidong|School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), China, LI Zihe|School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), China, FU Xiangkang|School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), China
Keywords
Related Articles
- EP ID EP738055
- DOI 10.20078/j.eep.20230805
- Views 29
- Downloads 0
Situation and prospects of treatment technologies for mine water containing ammonia nitrogen
As the discharge standards for mine water treatment become more stringent, the requirements for effective removal of ammonia nitrogen from mine water are strongly needed. While there are several methods available for tre...
Advances in biomass-based thermochemical hydrogen production technology
The excessive utilization of fossil fuels has caused the energy crisis and greenhouse effect, and the development of clean and sustainable sources can adjust the energy structure of China and promote green and sustainabl...
Main factors influencing the electro-methanation of CO_2 in microbial electrolytic cells and the role of electron intermediates
Greenhouse gas emissions from fossil fuel combustion have led to global ecological degradation and energy crisis. Therefore, it is urgent to explore new technologies for the conversion, reuse and clean energy production...
Study on neurotoxic effects of microplastics and triclosan on the zebrafish
Zebrafish was chosen as a model organism to explore the neurotoxic effects of combined exposure to three microplastics (PP, PE, PVC) and triclosan (TCS). The results showed that microplastics (MPs) could be used as the c...
Applications of microfluidics in carbon capture, utilization and storage (CCUS)
Carbon capture, utilization and storage (CCUS) are the key technologies to address global warming. CCUS technologies reduce the CO_2 content in the atmosphere by CO_2 capture and storage. Replacing the use of fossil fuel...