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    1.
    发明专利
    未知

    公开(公告)号：BR9800554A

    公开(公告)日：1999-09-28

    申请号：BR9800554

    申请日：1998-02-04

    Applicant: DEGUSSA

    Inventor： SCHUETTE RUEDIGER ,  ALT HANS CHRISTIAN ,  BECKER-BALFANZ CATRIN ,  SAUER MANFRED ,  HIPPEL LUKAS VON ,  FEUER OLIVER ,  LOROESCH JUERGEN

    IPC: C01C3/08 ,  C01C3/10

    Abstract: Preparation of alkali or alkaline earth metal cyanide granules involves spraying an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide suspension onto a fluidised product seed bed at 100-250 degrees C in a fluidised bed spray granulation reactor which is supplied with a hydrogen cyanide-containing gas in amount ≥ 1 mol HCN per metal equivalent, the introduced and formed water being evaporated by the fluidising gas supplied at 110-500 degrees C. Also claimed are sodium or potassium cyanide granules having a spherical particle shape with a smooth or raspberry-like surface structure, 0.1-20 mm particle diameter for 99 wt.% of the granules, ≥ 600 g/dm bulk density, less than 1 wt.% wear measured by the roller wear test (Erwaka TAR wear tester, 20 g sample, 60 minutes, 20 rpm.) and a clumping index of NOTGREATER 4 (measured by 14 day 10g load application onto a 100 g sample in a 5.5 cm inside diameter cylinder), the novelty being that the alkali metal carbonate content is less than 0.5 wt.% and the alkali metal formate content is less than 0.3 wt.%, the alkali metal in these by-products being the same as that in the cyanide. Preferably, the total alkali metal carbonate and alkali metal formate content is less than 0.4 wt.% and the granules are prepared by the above process using reaction gas from a BMA process and superheated steam as fluidising gas.

    PROCESS FOR THE PREPARATION OF ALKALI OR ALKALINE-EARTH METAL CYANIDE GRANULATES AND THE OBTAINED HIGH PURITY ALKALI METAL CYANIDE GRANULATES
    4.
    发明专利
    PROCESS FOR THE PREPARATION OF ALKALI OR ALKALINE-EARTH METAL CYANIDE GRANULATES AND THE OBTAINED HIGH PURITY ALKALI METAL CYANIDE GRANULATES 未知

    公开(公告)号：SK14398A3

    公开(公告)日：1998-08-05

    申请号：SK14398

    申请日：1998-02-02

    Applicant: DEGUSSA

    Inventor： SCHUETTE RUEDIGER ,  ALT HANS-CHRISTIAN ,  BECKER-BALFANZ CATRIN ,  SAUER MANFRED ,  VON HIPPEL LUKAS ,  FEUER OLIVER ,  LOROESCH JUERGEN

    IPC: C01C3/08 ,  C01C3/10

    Abstract: Preparation of alkali or alkaline earth metal cyanide granules involves spraying an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide suspension onto a fluidised product seed bed at 100-250 degrees C in a fluidised bed spray granulation reactor which is supplied with a hydrogen cyanide-containing gas in amount ≥ 1 mol HCN per metal equivalent, the introduced and formed water being evaporated by the fluidising gas supplied at 110-500 degrees C. Also claimed are sodium or potassium cyanide granules having a spherical particle shape with a smooth or raspberry-like surface structure, 0.1-20 mm particle diameter for 99 wt.% of the granules, ≥ 600 g/dm bulk density, less than 1 wt.% wear measured by the roller wear test (Erwaka TAR wear tester, 20 g sample, 60 minutes, 20 rpm.) and a clumping index of NOTGREATER 4 (measured by 14 day 10g load application onto a 100 g sample in a 5.5 cm inside diameter cylinder), the novelty being that the alkali metal carbonate content is less than 0.5 wt.% and the alkali metal formate content is less than 0.3 wt.%, the alkali metal in these by-products being the same as that in the cyanide. Preferably, the total alkali metal carbonate and alkali metal formate content is less than 0.4 wt.% and the granules are prepared by the above process using reaction gas from a BMA process and superheated steam as fluidising gas.

    PROCESS FOR LEACHING GOLD AND SILVER
    6.
    发明专利
    PROCESS FOR LEACHING GOLD AND SILVER 未知

    公开(公告)号：CA2067841A1

    公开(公告)日：1992-11-04

    申请号：CA2067841

    申请日：1992-05-01

    Applicant: DEGUSSA

    Inventor： LOROESCH JUERGEN ,  ZIEGLER ANNETTE

    IPC: C22B11/08

    Abstract: In the so-called cyanidation-in-mill technique, the ores, ore concentrates and waste material from previous incomplete leachings which are to be leached are treated in the mill with a cyanide-containing leaching solution, gold and silver being at least partly leached. Compared with the known cyanidation-in-mill technique in the presence of hydrogen peroxide, the gold yield can be considerably increased if leaching is carried out in the presence of a peroxoborate compound. The peroxoborate may be present in solid and/or dissolved form. 10 to 60 equivalents peroxoborate are preferably used per t of the material to be leached.

    PROCEDURE FOR LEACHING PRECIOUS METALS USING A CYANIDE-CONTAINING LEACHING SOLUTION AND HYDROGEN PEROXIDE
    8.
    发明专利
    PROCEDURE FOR LEACHING PRECIOUS METALS USING A CYANIDE-CONTAINING LEACHING SOLUTION AND HYDROGEN PEROXIDE 未知

    公开(公告)号：CA1332110C

    公开(公告)日：1994-09-27

    申请号：CA610737

    申请日：1989-09-08

    Applicant: DEGUSSA

    Inventor： KNORRE HELMUT ,  LOROESCH JUERGEN ,  GOS STEVEN ,  STOLL MATHIAS ,  ZIEGLER ANNETTE

    IPC: C22B11/08

    Abstract: A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O2/liter. In the invention, leaching takes place in the presence of decomposition catalysts and preferably the formed cyano-complexes are separated during leaching from the leach solution. Decomposition catalysts are manganese compounds, present as 0.01 to 1 mg computed as Mn/liter of barren solution, or 1 to 50 mg computed as Mn per kg of ore slurry, or they are inorganic or organic polymers or carbon. Activated charcoal is preferred and simultaneously adsorbing cyano-complexes of precious metals. The process offers lowered consumption of H2O2 and possibly cyanide and maximum gold yield in a shortened leaching time.

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