Some physical and chemical characteristics of calcium lignosulphonate-bound coal fines
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Date
2018Author
Strydom, C.A.
Mthombo, T.S.
Bunt, J.R.
Neomagus, H.W.J.P.
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Show full item recordAbstract
Low-cost calcium lignosulphonate (CL), which is a byproduct of theWOOD
pulping industry, was investigated as a potential binder during laboratoryscale pelletization of inertinite-rich high-ash coal fines from the Highveld
Coalfield of South Africa. Coal-binder mixtures containing between 1 and
15% calcium lignosulphonate were prepared, pressed, and ultimate,
proximate, porosity, XRD, and XRF analyses obtained. It was found that
increased pressure during pelletization results in increased attractive
forces, due to increased interparticle contact areas. FTIR analysis showed
that chemical interactions occur between coal fines and the binder, as
evidenced by the formation of new C−O ether-type bonds. The presence of
moisture during pelletization enhanced surfactant activity of the binder.
Chemical interactions between the coal and the binder seem to be mainly
electrostatic, driven by Ca2+ from the calcium lignosulphonate, which may
act as a bridge between the anionic parts of the binder and the surface of
the coal
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http://hdl.handle.net/10394/31932https://www.saimm.co.za/Journal/v118n12p1277.pdf
http://dx.doi.org/10.17159/2411-9717/2018/v118n12