Currently. arsenic is removed from blister copper by soda and calcium hydroxide injection into liquid metal. In consequence sodium and calcium arsenates are formed. These arsenaies could be converted to analogues of minerals, which naturally contain high concentration of arsenic and are known to be durable over geological time and slightly soluble in water. The project attempted to show that sodium arsenate contained in slag could be convened into svabite Ca;(AsO4)3F which is being considered for safe disposal of arsenic. The thermal stability of the synthesised svabite under low oxygen pressure was also determined.

This paper presents a brief review of methods of leaching copper ores and concentrates with acidic and alkaline reagents, and addresses the nature of the reactions occurring during dissolution of polydispersed material. Based on known studies, a method is proposed to calculate the reaction-rate constants and apparent activation energy for dissolution of lead from copper concentrates. Lead was leached with I O and 40 percent ammonium acetate solutions at temperatures ranging from 293K to 323K. Based on the experimental results, the apparent activation energy was calculated for dissolution of lead from copper concentrate.