公开(公告)号：EP1165847A1

公开(公告)日：2002-01-02

申请号：EP00901429.1

申请日：2000-01-21

申请人： Placer Dome Inc.

发明人： DREISINGER, David, Bruce

IPC分类号： C22B11/08 ,  C22B3/38 ,  A62D3/00 ,  C02F1/26

CPC分类号： C22B11/08 ,  C02F1/26 ,  C22B3/0043 ,  C22B3/0063 ,  Y02P10/234 ,  Y10S210/903 ,  Y10S210/904

摘要： The invention provides a process for recovering hydrogen cyanide from an aqueous solution by extracting the hydrogen cyanide into an organic solvent phase. The organic solvent may comprise neutral organophosphorous compounds, such as compounds selected from the group consisting of alkyl or aryl substituted phosphates, phosphonates and phosphine oxides. In alternative embodiments the organophosphorous compound is tri-butyl phosphate, di-butyl-butyl-phosphonate or tri-alkyl phosphine oxides. The organic solvent may be diluted in an organic diluent, such as an aliphatic or kerosene-type diluent. Alternative dilutions may be used, such as 75 %, 50 % or 25 %. In some embodiments, the pH of the aqueous solution containing dissolved cyanide may be adjusted to between 2 and 8, or between 3 and 7, or between 4 and 6. The organic solvent may be contacted following extraction with a basic aqueous solution to strip cyanide from the organic solvent into a basic aqueous cyanide strip solution. The stripped organic solvent may then be returned to the loading process, to extract HCN from fresh aqueous solution. The aqueous solution is typically an aqueous ore processing waste solution, in paticular a gold ore cyamide reaching waste solution.