Abstract
The flocculation of quartz dust can be achieved using guar gum in suitable concentration ranges. The flocculation can be modified by surface treatment of the quartz. However, the hydrolysis of the -OSiMe 3 (Me ≡ CH 3) group used to give a surface OH was promoted at high gum concentrations so that the effect could only be seen at low guar gum concentrations. Some simple equations based on a modified Stokes law can be used to calculate the average floc size. The value of the hindrance factor A in these equations was 6.93 for the quartz powder which must be contrasted with the value of 81 for a silica gel and suggests that shape is not the only factor involved in deciding the value of A.
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