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1. 发明专利

AP786A Process for preparing alkali metal cyanide and alkaline earth metal cyanide granules and the high purity alkali metal cyanide granules obtainable thereby. 未知
公开(公告)号：AP786A
公开(公告)日：1999-11-26
申请号：AP9801197
申请日：1998-02-04
申请人： DEGUSSA , CYPLUS GMBH , EVONIK DEGUSSA GMBH
发明人： SCHUTTE RUDIGER , ALT HANS CHRISTIAN , BECKER-BALFANZ CATRIN , SAUER MANFRED , HIPPEL LUKAS VON , FEUER OLIVER , LOROSCH JURGEN
IPC分类号： C01C3/08 , C01C3/10
摘要： The invention relates to a process for the direct preparation of alkali metal cyanide and alkaline earth metal cyanide granules from an HCN-containing gas and an aqueous solution or suspension of an alkali metal or alkaline earth metal hydroxide. Reaction is performed in a reactor for fluidised bed spray granulation, wherein a solution or suspension of the hydroxide is sprayed onto seed granules of the cyanide being prepared and at the same time a hydrogen cyanide-containing gas is supplied to the reactor and water is evaporated by means of a fluidising gas. The preferred fluidising gas is steam. The reaction gases from a BMA or Andrussow process may be quenched with water and the gas mixture used as fluidising gas. By using a CO2-free HCN-containing gas, alkali metal cyanide granules with an outstanding combination of properties, including a concentration of alkali metal ' carbonate and alkali metal formate together of less then 0.4 wt.%, are obtainable.

2. 发明专利

AU5293098A Process for preparing alkali metal cyanide and alkaline earth metal cyanide granules 未知
公开(公告)号：AU5293098A
公开(公告)日：1998-08-13
申请号：AU5293098
申请日：1998-02-04
申请人： CYPLUS GMBH
发明人： SCHUTTE RUDIGER , ALT HANS CHRISTIAN , BECKER-BALFRANZ CATRIN , SAUER MANFRED , HIPPEL LUKAS VON , FEUER OLIVER , LOROSCH JURGEN
IPC分类号： C01C3/08 , C01C3/10
摘要： 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.

3. 发明专利

AU5215293A Alkali metal cyanide granulates and a process for their preparation 未知
公开(公告)号：AU5215293A
公开(公告)日：1994-06-16
申请号：AU5215293
申请日：1993-12-03
申请人： CYPLUS GMBH
发明人： RIEMENSCHNEIDER HERBERT , ALT CHRISTIAN , CLAUS MARTINA , LOROSCH JURGEN , LEUTNER JOSEF , MONCH HEINZ
IPC分类号： B01J2/04 , B01J2/16 , C01C3/10 , B01J2/02
摘要： 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.

4. 发明专利

NZ230544A PROCESS FOR LEACHING GOLD AND SILVER FROM ORES USING CYANIDE AND HYDROGEN PEROXIDE 未知
公开(公告)号：NZ230544A
公开(公告)日：1990-09-26
申请号：NZ23054489
申请日：1989-09-04
申请人： DEGUSSA
发明人： KNORRE HELMUT , LOROSCH JURGEN , GOS STEVEN , STOLL MATHIAS , ZIEGLER ANNETTE
IPC分类号： C22B11/08

5. 发明专利

BR8705756A 未知
公开(公告)号：BR8705756A
公开(公告)日：1988-05-31
申请号：BR8705756
申请日：1987-10-28
申请人： DEGUSSA
发明人： KNORRE HELMUT , LOROSCH JURGEN , FISCHER JOACHIM , GRIFFITHS ANDREW
IPC分类号： C22B11/08
摘要： 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.

6. 发明专利

AU721518B2 Process for preparing alkali metal cyanide and alkaline earth metal cyanide granules 未知
公开(公告)号：AU721518B2
公开(公告)日：2000-07-06
申请号：AU5293098
申请日：1998-02-04
申请人： DEGUSSA
发明人： SCHUTTE RUDIGER , ALT HANS CHRISTIAN , BECKER-BALFRANZ CATRIN , SAUER MANFRED , HIPPEL LUKAS VON , FEUER OLIVER , LOROSCH JURGEN
IPC分类号： C01C3/08 , C01C3/10
摘要： 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.

7. 发明专利

SK133693A3 ALKALI CYANIDE-GRANULATES AND PROCESS FOR THEIR PRODUCTION 未知
公开(公告)号：SK133693A3
公开(公告)日：1994-06-08
申请号：SK133693
申请日：1993-11-29
申请人： DEGUSSA
发明人： RIEMENSCHNEIDER HERBERT , ALT CHRISTIAN , CLAUS MARTIN , LOROSCH JURGEN , LEUTNER JOSEF , MONCH HEINZ
IPC分类号： B01J2/04 , B01J2/16 , C01C3/10
摘要： 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.

8. 发明专利

MX169904B 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
申请人： DEGUSSA
发明人： FISCHER JOACHIM , KNORRE HELMUT , GRIFFITHS ANDREW , LOROSCH JURGEN
IPC分类号： C22B11/08
摘要： 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.

9. 发明专利

ZA896609B PROCESS FOR LEACHING NOBLE METALS USING A LEACHING SOLUTION CONTAINING CYANIDE,AND HYDROGEN PEROXIDE 未知
公开(公告)号：ZA896609B
公开(公告)日：1990-06-27
申请号：ZA896609
申请日：1989-08-29
申请人： DEGUSSA
发明人： KNORRE HELMUT , HELMUT KNORRE , LOROSCH JURGEN , JURGEN LOROSCH , GOS STEVEN , STEVEN GOS , STOLL MATHIAS , MATHIAS STOLL , ZIEGLER ANNETTE , ANNETTE ZIEGLER
IPC分类号： C22B11/08 , C22B

10. 发明专利

DOP1987004572A PROCEDIMIENTO PARA LA LIXIVIACION DE METALES NOBLES A PARTIR DE LOS METALES METALIFEROS O CONCENTRADOS DE LOS MISMOS USANDO SOLUCIONES CIANURICAS BAJO AGREGADO DE PEROXIDO DE HIDROGENO 未知
公开(公告)号：DOP1987004572A
公开(公告)日：1998-12-05
申请号：DO1987004572
申请日：1987-10-09
申请人： DEGUSSA
发明人： GRIFFITHS ANDREW , LOROSCH JURGEN , KNORRE HELMUT
IPC分类号： C22B11/08

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