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    A PROCESS FOR LEACHING NOBLE METALS FROM ORES OR ORE CONCENTRATES USING CYANIDE-CONTAINING SOLUTIONS WITH ADDITION OF HYDROGEN PEROXIDE
    3.
    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.

    PROCESS FOR PRODUCING GRANULATES OF ALKALI METAL CYANIDE AND ALKALINE EARTH CYANIDE, AND CYANIDE GRANULATES WITH HIGH PURITY OBTAINED IN SUCH A MANNER
    6.
    发明专利
    PROCESS FOR PRODUCING GRANULATES OF ALKALI METAL CYANIDE AND ALKALINE EARTH CYANIDE, AND CYANIDE GRANULATES WITH HIGH PURITY OBTAINED IN SUCH A MANNER 未知

    公开(公告)号：CZ28998A3

    公开(公告)日：1998-08-12

    申请号：CZ28998

    申请日：1998-01-30

    Applicant: DEGUSSA

    Inventor： SCHUTTE RUDIGER DR ,  ALT HANS CHRISTIAN ,  BECKER-BALFANZ CATRIN ,  SAUER MANFRED DR ,  VON HIPPEL LUKAS DR ,  FEUER OLIVER ,  LOROSCH JURGEN DR

    IPC: C01C3/08 ,  C01C3/10 ,  B01J2/04

    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.

    GRANULATES OF ALKALI METAL CYANIDES AND PROCESS FOR PREPARING THEREOF
    9.
    发明专利
    GRANULATES OF ALKALI METAL CYANIDES AND PROCESS FOR PREPARING THEREOF 未知

    公开(公告)号：CZ285643B6

    公开(公告)日：1999-10-13

    申请号：CZ251293

    申请日：1993-11-23

    Applicant: DEGUSSA

    Inventor： RIEMENSCHNEIDER HERBERT DR ,  ALT CHRISTIAN ,  CLAUS MARTIN ,  LOROSCH JURGEN DR ,  LEUTNER JOSEF ,  MONCH HEINZ DR

    IPC: B01J2/04 ,  B01J2/16 ,  C01C3/10

    Abstract: The invention relates to new alkali cyanide granules based on sodium cyanide or potassium cyanide and also a process for the preparation thereof. Commercial alkali cyanide granules comprise irregular particles: disadvantages are, in particular, the tendency to form dust and lumps. Alkali cyanide granules of the invention have practically no abrasion and a reduced tendency to form lumps. The granules are characterised by essentially spherical particles, particle diameters in the range from 0.1 to 20 mm, a bulk density above 600 g/dm , an abrasion of less than 1% and a caking index of at most 4. The granules can be prepared by fluidised-bed spray granulation, by an aqueous solution containing an alkali cyanide being sprayed on alkali cyanide nuclei in a fluidised bed and water being evaporated.

    10.
    发明专利
    未知

    公开(公告)号：ES2116387T3

    公开(公告)日：1998-07-16

    申请号：ES93118345

    申请日：1993-11-12

    Applicant: DEGUSSA

    Inventor： RIEMENSCHNEIDER HERBERT DR ,  ALT CHRISTIAN ,  CLAUS MARTINA ,  LOROSCH JURGEN DR ,  LEUTNER JOSEF ,  MONCH HEINZ DR

    IPC: B01J2/04 ,  B01J2/16 ,  C01C3/10

    Abstract: The invention relates to new alkali cyanide granules based on sodium cyanide or potassium cyanide and also a process for the preparation thereof. Commercial alkali cyanide granules comprise irregular particles: disadvantages are, in particular, the tendency to form dust and lumps. Alkali cyanide granules of the invention have practically no abrasion and a reduced tendency to form lumps. The granules are characterised by essentially spherical particles, particle diameters in the range from 0.1 to 20 mm, a bulk density above 600 g/dm , an abrasion of less than 1% and a caking index of at most 4. The granules can be prepared by fluidised-bed spray granulation, by an aqueous solution containing an alkali cyanide being sprayed on alkali cyanide nuclei in a fluidised bed and water being evaporated.

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