发明名称 |
Reducing cyanide consumption in gold recovery from finely ground sulphide ores and concentrates |
摘要 |
Precious metals such as gold can be extracted from a refractory ore using a conventional cyanide leaching step and with reduced cyanide consumption by pre-treating the ore prior to cyanide leaching. The refractory ore is pretreated by fine grinding and an initial leaching step which uses inexpensive limestone and lime to maintain the initial leach relatively alkaline. Oxygen is added to the initial leaching step and the conditions are carefully controlled to only partially oxidize the ground ore to between 9-15%. The initial leaching step can be carried out at temperatures of less than 100 degrees C. and at atmospheric pressures. The pre-treated ore is then leached by a conventional cyanide leaching step to recover the precious metal and cyanide consumption can be reduced by more than two thirds.
|
申请公布号 |
US2006185475(A1) |
申请公布日期 |
2006.08.24 |
申请号 |
US20030533317 |
申请日期 |
2003.10.22 |
申请人 |
HOURN MICHAEL M;VENTURA RODRIGO U;WILLIS JOHN A;WINBORNE DAVID |
发明人 |
HOURN MICHAEL M.;VENTURA RODRIGO U.;WILLIS JOHN A.;WINBORNE DAVID |
分类号 |
C22B11/08;C22B1/00;C22B3/14 |
主分类号 |
C22B11/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|