公开(公告)号：EP1452492A1

公开(公告)日：2004-09-01

申请号：EP02778066.7

申请日：2002-11-07

申请人： Nihon Parkerizing CO., LTD. ,  Parker Netsushori Kogyo K.K.

发明人： KOJIMA, Ryuji, Nihon Parkerizing Co., Ltd. ,  NAKAMURA, Humihide, Nihon Parkerizing Co., Ltd. ,  YONEYAMA, Yoshiyasu, Nihon Parkerizing Co., Ltd ,  YASHIRO, Kuniji ,  TOTSUKA, Toshiko 5 A403 of Greencorp Kibogaoka

IPC分类号： C02F1/76

CPC分类号： C02F1/76 ,  C02F1/008 ,  C02F1/02 ,  C02F1/683 ,  C02F2101/18 ,  C02F2103/16 ,  C02F2209/02 ,  C02F2209/04 ,  C02F2209/06

摘要： A highly reliable detoxifying method of the cyano matters is provided. The waste-liquor (1), which contains at least one of free cyano matters, a cyano complex and a reducing compound exhibiting volatility in alkaline aqueous solution, is heated under an alkaline condition to a temperature range, which lies within a range of from room temperature to boiling point, and which includes a high temperature range of 80°C or more, followed by holding the temperature (7); oxidation-reduction potential of the waste liquor is measured from the room temperature; and, hypochlorite (2) is intermittently or continuously added to the waste liquor from the room temperature, until the oxidation-reduction of the the hypochlorite is detected.