Mineral Processing Water Treatment Using Magnesium Oxide.
Schiller-JE; Tallman-DN; Khalafalla-SE
Environ Prog 1984 May; 3(2):136-141
This paper describes two applications where magnesium oxide (mgo) can be used to purify process water in two ways: (1) to filter out suspended solids and (2) to precipitate dissolved heavy metals. Granular mgo (periclase mineral) out-performs sand in deep bed filters, since an mgo filter system operates with cycles up to twice as long and gives a cleaner filtrate than a comparable sand filter. To precipitate heavy metals, powdered mgo (magnesia chemical) is used instead of lime or caustic soda. The mgo-formed sludge cements into a solid mass on standing and occupies only about 20 to 30 pct of the volume as the precipitates produced by more soluble bases.
Environ. Prog., V. 3, No. 2, May 1984, PP. 136-141