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sun low iron silica sand improvement

US4401638A Process for purifying silica sand Google Chubb in Pat No 3297402 in turn discloses a method of decreasing the quantity of iron sulfide contaminants in silica sand which comprises the step of leaching the sand with a hypochlorite but this process is restricted only to remove iron sulfides and not iron oxide and it is a well known fact that the main contaminant of mineral