Abstract
Publisher Summary This chapter discusses several Chinese coals that are demineralized using various methods. The corresponding changes of rheological behavior and static stability of coal water slurry (CWS) are investigated. The function of mineral matters and the added electrolyte on CWS are also discussed in the chapter. Various pretreatments for demineralization are used to study the effects of mineral matters on the CWS properties. Water-washing did not affect CWS properties while acid-washing significantly increased the apparent viscosity and decreased the maximum coal loading (MXCL). The high concentration of dissolved inorganic ions, especially high-valent cations is attributed to this behavior. The damage of CWS properties after de-ashing pretreatment, resulting in a sharp increase in apparent viscosity, decrease in MXCL and static stability and change in rheologic behavior. The addition of electrolyte improves the rheological behavior. The effects of mineral matters on CWS properties contribute to their soluble ions.
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