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    5.
    发明专利
    未知

    公开(公告)号：DE68900333D1

    公开(公告)日：1991-11-21

    申请号：DE68900333

    申请日：1989-03-14

    Applicant: DEGUSSA

    Inventor： GRIFFITHS ANDREW DR ,  NORCROSS ROY

    IPC: B03C1/00 ,  C02F1/72 ,  C22B3/44 ,  C22B11/08 ,  C02F1/48

    Abstract: The invention relates to processes for the detoxification of effluents from ore processing operations utilizing hydrogen peroxide. It has been found that the demand of hydrogen peroxide can be reduced considerably when a significant portion of magnetic substances contained in the effluent are being magnetially separated before treating the effluent utilizing hydrogen peroxide. The process of the invention can preferably be applied in the detoxification of tailings pulps which contain magnetic substances and cynnides.

    A PROCESS FOR LEACHING NOBLE METALS FROM ORES OR ORE CONCENTRATES USING CYANIDE-CONTAINING SOLUTIONS WITH ADDITION OF HYDROGEN PEROXIDE
    8.
    发明专利
    A PROCESS FOR LEACHING NOBLE METALS FROM ORES OR ORE CONCENTRATES USING CYANIDE-CONTAINING SOLUTIONS WITH ADDITION OF HYDROGEN PEROXIDE 未知

    公开(公告)号：AU589818B2

    公开(公告)日：1989-10-19

    申请号：AU8053387

    申请日：1987-10-30

    Applicant: DEGUSSA

    Inventor： LOROSCH JURGEN DR ,  FISCHER JOACHIM ,  GRIFFITHS ANDREW DR ,  KNORRE HELMUT DR

    IPC: C22B11/08 ,  C22B11/04

    Abstract: Leaching of gold and/or silver from ores or ore concentrates in an aqueous alkaline cyanide solution with added hydrogen peroxide has so far not been used industrially, because it is uneconomical, i.e. the consumption of H2O2 and NaCN was unduly high. It has been found that the process can be made very economical and disadvantages of the conventional leaching technology can be avoided if the addition of the aqueous H2O2 solution is controlled via the concentration of the oxygen dissolved in the leaching solution, which contains 2 to 20 mg of O2 and preferably 7 to 13 mg of O2 per litre. Preferably, 0.5 to 5% by weight of H2O2 solutions are added under control. The process is applicable to agitation leaching and heap leaching, the H2O2 addition being controlled via measuring the O2 concentration in a measuring stream. At low consumption of H2O2 and NaCN, sometimes the gold yield is even increased and the leaching time is shortened.

    9.
    发明专利
    未知

    公开(公告)号：DE3637082C1

    公开(公告)日：1988-05-19

    申请号：DE3637082

    申请日：1986-10-31

    Applicant: DEGUSSA

    Inventor： KNORRE HELMUT DR ,  GRIFFITHS ANDREW DR ,  LOROESCH JUERGEN DR ,  FISCHER JOACHIM

    IPC: C22B11/08

    Abstract: Leaching of gold and/or silver from ores or ore concentrates in an aqueous alkaline cyanide solution with added hydrogen peroxide has so far not been used industrially, because it is uneconomical, i.e. the consumption of H2O2 and NaCN was unduly high. It has been found that the process can be made very economical and disadvantages of the conventional leaching technology can be avoided if the addition of the aqueous H2O2 solution is controlled via the concentration of the oxygen dissolved in the leaching solution, which contains 2 to 20 mg of O2 and preferably 7 to 13 mg of O2 per litre. Preferably, 0.5 to 5% by weight of H2O2 solutions are added under control. The process is applicable to agitation leaching and heap leaching, the H2O2 addition being controlled via measuring the O2 concentration in a measuring stream. At low consumption of H2O2 and NaCN, sometimes the gold yield is even increased and the leaching time is shortened.

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