Mineral matters of fossils may cause many problems in the utilization problems such as combustion, gasification, carbonization (Shirazi et al., 1995). Deminerali-zation of coal can be achieved by using acidic solutions such as HCl, HF, H2SO4 and basic solutions such as NaOH, Ca(OH)2, or some solutions like H2O2. With
I. Dincer et al. (eds.), Global Warming, Green Energy and Technology,
DOI 10.1007/978-1-4419-1017-2_21, © Springer Science+Business Media, LLC 2010
applying chemicals, first of all, the carbonaceous materials were separated from the structure. Later ash minerals were soluble and finally some elements in the organic structure such as Ca, K, Na were extracted (Yang et al., 1985). Karaca et al. (1997) studied the leaching effect of H2O2 on Turkish lignites of Beypazari and Tuncbilek. Maximum demineralization ranged from 30 to 70% in ash according to lignite type (Karaca and Ceylan, 1997). A high volatile UK coal was treated with aqueous HF followed by aqueous HNO3 by Steel and Patrick (2001a). They reported that the ash level could be reduced from 7.90 to 2.6% using HF alone and from 2.8 to 0.6% by treating the sample with 3.51 HF and then 1.26 M HNO3 (Steel and Patrick, 2001a). Steel et al. (2001b)applied hydrochloric and hydrofluoric acids for leaching mineral matter in Australian black coal. The results show that HCl could dissolve simple compounds such as phosphates and carbonates, but HF could react with almost every minerals especially siliceous except pyrite in the mineral matter (Steel et al., 2001b). Wu and Steel (2007) studied the two-stage leaching of UK bituminous coal using HF and Fe(NO3)3 ions. The ash amount decreased in Harworth coal from 5.30% to 990 ppm (Wu and Steel, 2007). Gulen et al. (2005) studied the various aqueous acidic solutions on the demineralization effect of Silopi Harput asphaltite. HCl was the most effective one among the other acids such as H2SO4, HNO3, and HF (Gulen et al., 2005). Gulen studied to identify some mineral groups in Nallihan lignite with polishing treatments after applying some acidic solutions such as HCl, H2SO4, HNO3, and HF of 5% (Gulen, 2007). In this study, the effects of aqueous H2O2 and some acidic solutions are investigated.
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