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公开(公告)号：AT73116T
公开(公告)日：1992-03-15
申请号：AT89113421
申请日：1989-07-21
Applicant: DEGUSSA
Inventor： GRIFFITHS ANDREW DR , AHSAN QUAMRUL M DR , NORCROSS ROY , KNORRE HELMUT DR , MERZ FRIEDRICH WILHELM
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公开(公告)号：AT51158T
公开(公告)日：1990-04-15
申请号：AT86106469
申请日：1986-05-13
Applicant: DEGUSSA
Inventor： FISCHER JOACHIM , KNORRE HELMUT DR
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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.
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公开(公告)号：CH645990A5
公开(公告)日：1984-10-31
申请号：CH338380
申请日：1980-05-01
Applicant: DEGUSSA
Inventor： EIERMANN KURT DR , GOEDECKE RALF DR , KNORRE HELMUT DR , MOELLER ROLF
IPC: G01N27/416 , G01N27/52 , G01N27/46
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公开(公告)号：CH631684A5
公开(公告)日：1982-08-31
申请号：CH1142777
申请日：1977-09-19
Applicant: DEGUSSA
Inventor： KNORRE HELMUT DR , POHL GERHARD DR , STUETZEL GERHARD DR
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Patent Agency Ranking
公开(公告)号：CH454102A
公开(公告)日：1968-04-15
申请号：CH840263
申请日：1963-07-05
Applicant: DEGUSSA
Inventor： KNORRE HELMUT DR , KLOEPFER HARRY DR , BRETSCHNEIDER GUENTHER DR
IPC: C01B6/00
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公开(公告)号：AU614420B2
公开(公告)日：1991-08-29
申请号：AU4119389
申请日：1989-09-08
Applicant: DEGUSSA
Inventor： KNORRE HELMUT DR , ZIEGLER ANNETTE , STOLL MATHIAS , GOS STEVEN , LOROSCH JURGEN DR
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公开(公告)号：DE3669662D1
公开(公告)日：1990-04-26
申请号：DE3669662
申请日：1986-05-13
Applicant: DEGUSSA
Inventor： FISCHER JOACHIM , KNORRE HELMUT DR
Abstract: In purifying gas wash waters containing cyanide with formaldehyde, the exact dosing of formaldehyde presents a problem, especially with strongly fluctuating cyanide contents. By continuous potentiometric measurement in a side stream which is regulated to a pH of 7 to 10, while the pH of the main stream remains unchanged, the formaldehyde can be adjusted safely to any cyanide content.
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公开(公告)号：DE2715044A1
公开(公告)日：1978-10-12
申请号：DE2715044
申请日：1977-04-04
Applicant: DEGUSSA
Inventor： KNORRE HELMUT DR , LANGER MANFRED DR , POHL GERHARD DR
IPC: C07C233/00 , C07C103/36
Abstract: Prepn. of MDF (I) comprises reacting Me2NH and Ca formate (II) in presence of CO2. Pref. the reaction is at 110-180 degrees C and 5-60 bar in a mixt. of water and lower alkanol. Pref. 0.8-1.05, esp. 0.95-1.05 moles (II) are used per mole Me2NH, with 1-10, esp. 1.5 equiv. CO2 used per mole (II). The amount of water is >=4, pref. 5-15 moles per mole (II) and the vol. ratio of organic solvent to water is not >5.1. Yields of (I) are >80% and purity >=99.9%. The method can also be used to make other N-alkyl-or N-aryl substd. formamides from mono- or di-alkylamines or aromatic amines.
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公开(公告)号：CH522744A
公开(公告)日：1972-06-30
申请号：CH1300266
申请日：1966-09-08
Applicant: DEGUSSA
Inventor： GOTTFRIED KALLRATH , BIEGLER HANNS DR , KNORRE HELMUT DR , MEYER-SIMON EUGEN DR
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