Proportion of quartz sand washed by ammonium hydrogen fluoride

the amount of hydrochloric acid is 5% of the sand weight. The common environmental pickling formulas for quartz sand in industry are oxalic acid+ammonium hydrogen fluoride, oxalic acid+hydrofluoric acid, etc. The proportion of acid washing quartz sand with ammonium hydrogen fluoride is 5% of the sand weight. Ammonium hydrogen fluoride is a corrosive chemical substance, which decomposes toxic fluoride, nitrogen oxides and ammonia gas when exposed to moisture and water.