Disposal of coal combustion wastes in the hydraulic backfill process

The Role of Polish Coal in the National and European Energy Sector

Pierzyna, Piotr^1

Faculty of Mining and Geology, Silesian University of Technology, Akademicka 2, Gliwice

44-100, Poland^1

关键词: Atmospheric conditions;    Backfill material;    Bonding property;    Coal combustion wastes;    Combustion by-products;    Energy productions;    Fluidized bed boilers;    Underground mine;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/268/1/012011/pdf
DOI  :  10.1088/1757-899X/268/1/012011

来源: IOP

【 摘 要 】

This article presents the results of studies regarding the physical properties of selected combustion by-products (CCPs) currently produced in the energy production industry. These properties have been compared with the requirements of the technologies applied in the Polish underground mines. The article gives special consideration to the application of the products in the hydraulic backfill technology. The possibility of using bottom-ashes and slags was considered. The amount of CCPs disposed in Polish hard coal mines is approximately 1.1 million Mg and the tendency is decreasing. In the past two years, approximately 100-150 thousand Mg of CCPs was used in the hydraulic backfill technology. The percentage of the fraction smaller than 0.1 mm is determining for the possibility of using a given type of CCPs in the backfill material. This practically excludes the possibility of using any fly ashes in that technology. In slags from conventional boilers and bottom ashes from fluidized bed boilers the fraction below 0.1 mm constitutes 25% of the total at maximum, which allows for their use in the materials used in hydraulic backfill as a component comprising from 30% to 60%, respectively. Slags (10 01 01) are characterized by the lack of bonding properties, which, in case of open backfill systems that are exposed to atmospheric conditions, constitutes an advantage in comparison to bottom ashes (10 01 24), which in turn definitely exhibit bonding properties. The solution of the problem of using bottom ashes is their supply and application on a current basis.