... column construction, normally because of the different Country of Origin with the different types and quantity of impurities, resulting in ... refractory (Zirconium refractories, such as zirconium corundum brick, zirconium refractory fiber), molding industry, ceramic and enamelware producing, in addition, also ... , potassium, zirconium sulfate, etc.). 2012 HOT SELL zirconium sand with good quality