2004 Volume 11 Issue 309 Pages 113-118
The conversion of waste cast iron powder exhausted from a foundry into pyroaurite-like compounds has been investigated by coprecipitation and hydrothermal methods, aiming at resource recovery. An acid pretreatment of waste cast iron powder and an addition of a magnesium source were necessary processes to convert into pyroaurite-like compounds. The hydrothermal method brought pyroaurite-like compounds with good crystallinity, while the coprecipitation method did ones with poor crystallinity. The resulting materials exhibited removal properties for nitrate and phosphate ions. The products, therefore, seem usable as removal agents for toxic anions in waste water.
