| 摘要 |
Methods for extracting gold from ores are disclosed. A solution of iodine and potassium iodide (102) dissolves the gold from the ore in a reaction pond (104). A filter unit (120) is positioned between the solution supply and the pond. Liquid solution product is withdrawn by pump (162) and includes unreacted KI3 and KI and a dissolved gold iodide complex. The liquid product passes to a heat exchanger (166) and then to a crystallization tank (170) which uses an evaporative cooling unit (171) to lower the temperature in the tank. In the tank a precipitate Au.KI3 (180) forms which is removed by a vacuum filter (182). The precipitate is combined with water until it is dissolved and as a result AuI crystals (202) are formed which are then separated from the remaining solution (204) which is dissolved KI and I2. |
