| 1. |
- Banda, H., et al.
(författare)
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Der Einfluss von Trübedichte, Körnung und Filtrationsdruck auf den Durchflusswiderstand eines Filterkuchens
- 1987
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Ingår i: Aufbereitungstechnik - Mineral processing. - 0004-783X. ; 28:9, s. 513-520
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Tidskriftsartikel (refereegranskat)abstract
- The effects of slurry concentration, filtration pressure and particle size distribution on the resistance of a filter cake are studied, and an attempt is made to examine the filtration process with reference to the structure of the filter cake. Micrographic analysis clearly demonstrates the effect of particles segregation on filtration rate. The resistance of the cake rises with increasing solids concentration of the slurry, mainly due to a lower degree of particle segregation.
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| 2. |
- Banda, H., et al.
(författare)
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Porositätsvariationen bei auf horizontalen Flächen unter Druck geformten Filterkuchen
- 1988
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Ingår i: Aufbereitungstechnik - Mineral processing. - 0004-783X. ; 29:1, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- Direct measurement of the porosity variation in filter cakes by image analysis has been tested on chalcopyrite and magnetite slurries. It was found to give more accurate results than previous indirect methods, especially at the surface of the cake. Microscopy and image analysis visualize the effect of particle size, particle segregation and air bubbles on cake porosity. In a filter cake formed under constant pressure, the maximum porosity is shown to occur in regions inside the cake, rather than on the surface.
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| 3. |
- Banda, H., et al.
(författare)
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Strukturanalyse eines Filterkuchens mit dem Bildanalysator
- 1987
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Ingår i: Aufbereitungstechnik - Mineral processing. - 0004-783X. ; 28:4, s. 175-180
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Tidskriftsartikel (refereegranskat)abstract
- Two methods for the consolidation of filter cakes are developed; one of them is based on acrylate plastic as an impregnating medium, and the other uses epoxy resin and is suitable for sulfide-carrying materials, where the first one fails. Even cakes formed from fine particles ( less than 38 mu m) can be consolidated using these methods. Specimens prepared with acrylate offer no difficulties in grinding and polishing; those prepared with epoxy resin, however, call for procedures with bonded grinding media, and the sections are preferably examined under a scanning electron microscope. Direct comparison between the consolidation methods has not been made. Porosity and pore size distribution are measured in filter cakes formed from two different materials using a computerized image analyzer.
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| 4. |
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| 5. |
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| 6. |
- Forssberg, Eric, et al.
(författare)
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Entphosphorung von hochphosphorhaltigen Eisenerzen durch saure Laugung
- 1981
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Ingår i: Erzmetall. - 0044-2658. ; 34:6, s. 316-322
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Tidskriftsartikel (refereegranskat)abstract
- High phosphorous sinter fines are leached with hydrochloric or nitric acids to digest the phosphorous bearing apatite. Concentrates with less than 0. 05% P can be manufactured with acceptable losses of iron and acid consumption. The process will be viable if the phosphorus in the acid can be recovered as phosphoric acid.
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| 7. |
- Forssberg, Eric, et al.
(författare)
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Feinmahlung und Klassierung von Kalkstein für die Papierindustrie
- 1988
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Ingår i: Freiberger Forschungshefte. A. - 0071-9390. ; :778, s. 90-101
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Tidskriftsartikel (refereegranskat)abstract
- Tests with different mills were performed to grind limestone and dolomite to particle sizes which can be used for filling and coating materials. Different vibrating ball mills, mills of co-ball-type and an attrition mill were used. Vibrating ball mills produce products with the most narrow particle size distribution. The attrition mill yielded the highest specific surface area.
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| 8. |
- Gao, Mingwei, et al.
(författare)
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Efficiency of the large ball mill at Kirkenes concentrator of A/S Sydvaranger
- 1989
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Ingår i: Aufbereitungstechnik - Mineral processing. - 0004-783X. ; 30:3, s. 113-121
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the performance of the world's largest ball mill, of dimensions Φ 6.5 × 9.65m length, at Kirkenes concentrator of A/S Sydvaranger, Norway, is analyzed on the basis of Bond's theory. The data obtained reveal that the mill functioning is efficient from the standpoint of energy consumption under operating conditions. However, a comparison with the estimated performance according to Bond's theory shows that it has a lower capacity and coarser product. The problems of using Bond's method for the scale-up of the large ball mill are discussed.
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