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    Oxygen@ removal from alkaline cyanide soln. contg. noble metal - using oxygen binder and opt. heavy metal catalyst, reducing zinc@ consumption in cementation
    14.
    发明专利
    Oxygen@ removal from alkaline cyanide soln. contg. noble metal - using oxygen binder and opt. heavy metal catalyst, reducing zinc@ consumption in cementation 未知

    公开(公告)号：DE4028240A1

    公开(公告)日：1992-03-12

    申请号：DE4028240

    申请日：1990-09-06

    Applicant: DEGUSSA

    Inventor： DIEHL MANFRED DR ,  STEINER NORBERT DR ,  KNORRE HELMUT DR ,  KRONE ECKHARD DR ,  ZIMMER GERHARD DR

    IPC: C22B11/08

    Abstract: Removal of O2 from cyanide lixiviation soln. contg. noble metal before noble metal cementation with Zn involves reducing dissolved O2 at pH 9-14 by adding 1-5 times the stoichiometric amt. of O2 binder (I) for quantitative redn. of O2 and, if necessary, an effective amt. of heavy metal catalyst (II) to an O2 content of under 1 ppm. Pref. (I) is a soluble sulphite, whilst (II) is Mn, Fe, Co, Ni or Cu ions, pref. in a concn. of at least 20, esp. 25-100 ppm, partic. Cu ions from a Cu(II) salt in a concn. of at least 25, pref. 25-100, esp. 50-100 ppm. In this case, removal of O2 is carried out at pH 10-12. Alternatively, (I) is formamidinesulphinic acid or hydroquinone. Part of the O2 pref. is removed first by degassing or displacement with an inert gas. Treatment is carried out until the O2 content is zero, measured with an O2 electrode. ADVANTAGE - The noble metal yield is increased and the Zn consumption reduced, making the process more economical.

    A PROCESS FOR LEACHING NOBLE METALS FROM ORES OR ORE CONCENTRATES USING CYANIDE-CONTAINING SOLUTIONS WITH ADDITION OF HYDROGEN PEROXIDE
    15.
    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.

    16.
    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.

    Formamidine sulphinic acid used as oxygen@ binder - pref. in aq. alkaline soln. esp. cyanide soln. contg. noble metal cyano complex for cementation with zinc@
    20.
    发明专利
    Formamidine sulphinic acid used as oxygen@ binder - pref. in aq. alkaline soln. esp. cyanide soln. contg. noble metal cyano complex for cementation with zinc@ 未知

    公开(公告)号：DE4028239A1

    公开(公告)日：1992-03-12

    申请号：DE4028239

    申请日：1990-09-06

    Applicant: DEGUSSA

    Inventor： DIEHL MANFRED DR ,  STEINER NORBERT DR ,  KNORRE HELMUT DR ,  KRONE ECKHARD DR ,  ZIMMER GERHARD DR

    IPC: C02F1/20 ,  C22B11/08 ,  C23F11/16

    Abstract: The use of formamidinesulphinic acid (I) as O2 binder is claimed. USE/ADVANTAGE - (I) is claimed for use as O2 binder in aq. alkaline soln., esp. in a cyanide lixiviation soln. contg. noble metal cyano complex, before pptn. of the noble metal by cementation with Zn. It is very effective at low temp.(e.g. room temp.) and in the absence of heavy metal catalysts. It can be used in strongly alkaline solns.. In an example, 1 l aq. soln. contg. 200 ppm NaCN, adjusted to pH 10.5 with CaO, was treated at 20 deg C with 500 mg of (A) Na2SO3, (B) Na2SO3 + 10 ppm Cu2+, (C) Na2SO3 + 50 ppm Cu2+, (D) N2H4, (E) ascorbic acid, (F) hydroquinone as O2 binder (controls) or with (I) in a concn. of (G) 0.1, (H) 0.2, (J) 0.3, (K) 0.5, (L) 1.0 g/l. The O2 content of the soln. was (A, B, H, J) 8.6, (C) 8.3, (D) 8.1, (E) 8.4, (F) 9.0, (G, K, L 8.8 ppm initially; (A) 8.2, (F) 5.8, (C) 0.2, (D) 8.0, (E) 8.1, (F) 0.9, (G) 8.7, (H) 7.5, (J) 6.8, (K) 5.9, (L) 4.9 ppm after 1 min; (A) 8.1, (B) 5.1, (C) 0, (D) 7.8, (E) 7.5, (F) 0.2, (G) 7.7, (H) 3.5, (J) 0.5, (K) 0.3, (L) 0.1 ppm after 3 min.; (A) 8.2, (B) 5.1, (D) 7.8, (E) 7.7, (F) 0, (G) 6.5, (H) 0.5, (J) 0.1, (K, L) 0 ppm; after 5 min.; (G) 3.1, (H, J) 0 ppm after 10 min.; and (G) 0 ppm after 15 min..

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