afs washed sand procedure in philippines

afs washed sand procedure in philippines

Jun 01 2003 · The sand is washed with distilled water until no more acidity is detected and then 250 ml of distilled water and 60 g of potassium hydroxide are added The mixture is boiled for a further 25 min the sand is washed again with distilled water until no more alkalinity is detected and the residue is filtrated and dried


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