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    1.
    发明专利
    未知

    公开(公告)号：DE59200105D1

    公开(公告)日：1994-05-11

    申请号：DE59200105

    申请日：1992-02-26

    Applicant: DEGUSSA

    Inventor： DIEHL MANFRED DR ,  FISCHER JOACHIM ,  WOLF HUBERT

    IPC: C02F1/58 ,  C02F1/72

    Abstract: The invention relates to a process for detoxifying aqueous solutions containing cyanohydrins, in particular glycolonitrile and/or nitriles, which additionally contain decomposition catalysts for peroxide compounds, in particular manganese compounds, by perhydrolysis of the cyano compounds at temperatures of 5 to 80 DEG C and pHs of 8 to 12, with one or more peroxide compounds selected from the group comprising the alkali metal percarbonates, alkali metal perborates and alkaline earth metal perborates and the alkaline earth metal peroxides, the peroxide compounds mentioned being added as such to the solution to be detoxified or are formed in situ in the solution to be detoxified. Sodium percarbonate is preferably used. … The process according to the invention is more effective and more economical than the previously known process using hydrogen peroxide.

    Process for the separation of hydrogen cyanide from gases and waste gases
    2.
    发明专利
    Process for the separation of hydrogen cyanide from gases and waste gases 未知

    公开(公告)号：AU645203B2

    公开(公告)日：1994-01-06

    申请号：AU1710592

    申请日：1992-05-22

    Applicant: DEGUSSA

    Inventor： FISCHER JOACHIM ,  WOLF HUBERT ,  DIEHL MANFRED

    IPC: B01D53/30 ,  B01D53/34 ,  B01D53/54 ,  C10L3/10

    Abstract: The invention relates to a process for the separation of hydrogen cyanide from gases and exhaust gases by through-flow or circulation scrubbing, formaldehyde being added in a controlled manner to the aqueous scrubbing liquid for glycol nitrile formation; the control is carried out via the measurement of the HCN tension in a branched-off measurement stream, which is first treated with hydrogen peroxide in such a manner that after 1 to 100 seconds free H2O2 is still detectable, and is set to a constant pH prior to the HCN tension measurement. The process avoids a formaldehyde overdose which could not always be avoided in previously known processes having a control of the formaldehyde addition via the measurement of the cyanide-specific redox potential.

    3.
    发明专利
    未知

    公开(公告)号：MX169904B

    公开(公告)日：1993-07-30

    申请号：MX895987

    申请日：1987-10-23

    Applicant: DEGUSSA

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

    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.

    4.
    发明专利
    未知

    公开(公告)号：DE59000101D1

    公开(公告)日：1992-05-27

    申请号：DE59000101

    申请日：1990-08-22

    Applicant: DEGUSSA

    Inventor： FISCHER JOACHIM ,  WOLF HUBERT

    IPC: C02F1/52 ,  C02F1/72 ,  C02F9/00

    Abstract: The content of halo-organic pollutants in water is lowered to residual AOX values below 1 mg/l, preferably below 0.1 mg/l by adjusting the Fe2+ comtent of the water to 20 to 1000 mg/l, adding a precipitated or pyrogenic silicic acid, converting 20 to 1000 mg of the Fe2+ into Fe3+ by adding in an oxidation agent, preferably hydrogen peroxide, and separating the iron (III) hydroxy complexes formed and the silicic acid, which contain the halo-organic pollutants in an adsorbed state, at pH 5-10. The method can be controlled in a simple manner as regards the addition of Fe2+ and oxidation agent via the Fe2+/Fe3+ redox potential.

    A PROCESS FOR LEACHING NOBLE METALS FROM ORES OR ORE CONCENTRATES USING CYANIDE-CONTAINING SOLUTIONS WITH ADDITION OF HYDROGEN PEROXIDE
    5.
    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：PH24130A

    公开(公告)日：1990-03-05

    申请号：PH36007

    申请日：1987-10-30

    Applicant: DEGUSSA

    Inventor： KNORRE HELMUT DR ,  LOROSCH JURGEN 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.

    7.
    发明专利
    未知

    公开(公告)号：PT86035A

    公开(公告)日：1987-11-01

    申请号：PT8603587

    申请日：1987-10-29

    Applicant: DEGUSSA

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

    IPC: C22B11/08 ,  C22B11/00

    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.

    10.
    发明专利
    未知

    公开(公告)号：IT7950971D0

    公开(公告)日：1979-12-03

    申请号：IT5097179

    申请日：1979-12-03

    Applicant: DEGUSSA ,  GERMANIA

    Inventor： KNORRE HELMUT ,  FISCHER JOACHIM

    IPC: C02F1/72 ,  C02F

    Abstract: In the detoxification of waste waters containing nitrite ions by means of hydrogen peroxide the addition of hydrogen peroxide is automatically controllable by adding the hydrogen peroxide continuously or in portions with continuous measurement of the pH and stopping the addition when no further reduction of the pH is caused by it. By control of the hydrogen peroxide addition through the change of the pH it is guaranteed that sufficient hydrogen peroxide is added to reach a complete detoxification of the waste water while on the other hand there is not wasted hydrogen peroxide unnecessarily.

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