Effect of Various Parameters on the Dispersion of Ultra Fine Iron Ore Slurry. Part-2.

Among the list of dispersion parameters effect of solid concentration, slurry pH, stirring speed and time were studied in Part I for stablization of Dilband iron ore slurry. In Part II the study is extended to survey most appropriate dispersant and its optimal dose. In present study sodium silicate (SS), sodium hexametaphosphate (SHMP), sodium pyrophosphate (SPP), and ethylene-diamine-tetraacetatic-acid (EDTA) dispersants were used. The different doses of these dispersants were studied at solid concentration 7.5%, pH 10.5, stirring speed 2000 rpm, and stirring time 5min, as optimal conditions found in Part I. Marginal improvement in slurry stabilization with addition of SS, SHMP, SPP, and EDTA was noted, however EDTA found to be most effective in stabilizing the slurry as compared to others. For the different doses of EDTA, SPP, SHMP, and SS tested, the best disperse ability was obtained at concentration of 0.135%, 0.025%, 0.2%, and 1.25% respectively.