Abstract
CO2 reactivity of briquettes derived from discard inertinite-rich Highveld coal using lignosulphonate and resin as binders
Highlights
About 12% of South African run-of-mine (ROM) coal is classified as fine (–0.5 mm) and ultrafine (–0.1 mm), with the majority of the ultrafine fraction being discarded into slimes dams and underground workings as a result of handling, transportation, and utilization limitations (England, 2000; Mangena and du Cann, 2007). Bell et al (2001) reported sulphur contents of up to 3.8% for discard coals from the Witbank coalfields
Similar observations were made for binderless and resin-bound briquettes. This is in agreement with the findings of Bunt and Waanders (2008), who concluded that Highveld coal particles smaller than 25 mm are not prone to fragmentation during the fixed bed gasification process
This could be ascribed to the evaporation of binders along with the evolution of micropores during the diffusion of the volatiles formed as a result of the pyrolysis process (Liu, Cao, and Liu, 2015)
Summary
About 12% of South African run-of-mine (ROM) coal is classified as fine (–0.5 mm) and ultrafine (–0.1 mm), with the majority of the ultrafine fraction being discarded into slimes dams and underground workings as a result of handling, transportation, and utilization limitations (England, 2000; Mangena and du Cann, 2007). Bell et al (2001) reported sulphur contents of up to 3.8% for discard coals from the Witbank coalfields. About 12% of South African run-of-mine (ROM) coal is classified as fine (–0.5 mm) and ultrafine (–0.1 mm), with the majority of the ultrafine fraction being discarded into slimes dams and underground workings as a result of handling, transportation, and utilization limitations (England, 2000; Mangena and du Cann, 2007). One of the major environmental risks associated with sulphide minerals in discard coals is acid rock drainage (Kotsiopoulos and Harrison, 2017). Industrial utilization of fine coal tailings can alleviate the environmental hazards associated with disposal, while increasing the coal resources in fossil fuel-dependent countries such as South Africa. A study by Wagner (2008) indicated that typical discard coal aged up to 40 years can contain between 18 and 40% mineral matter, with the lowest fixed carbon content determined as 37% (d.b.). The finer fraction (1.18 mm) had heating values as high as 21 MJ/kg (a.d.), and can be classified as a viable source of energy (Wagner, 2008)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
