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- Alexandrova, L., et al.
(författare)
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Thin film studies in mixed cationic-anionic surfactant system
- 2003
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Ingår i: Proceedings of the XXII International Mineral Processing Congress. - Marshalltown, South Africa : South African Institute of Mining and Metallurgy. - 0958460922 ; , s. 838-846
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Konferensbidrag (refereegranskat)
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| 2. |
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| 3. |
- Cui, Jirang, et al.
(författare)
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Mechanical recycling of waste electric and electronic equipment : a review
- 2003
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Ingår i: Journal of Hazardous Materials. - 0304-3894 .- 1873-3336. ; 99:3, s. 243-263
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Tidskriftsartikel (refereegranskat)abstract
- The production of electric and electronic equipment (EEE) is one of the fastest growing areas. This development has resulted in an increase of waste electric and electronic equipment (WEEE). In view of the environmental problems involved in the management of WEEE, many counties and organizations have drafted national legislation to improve the reuse, recycling and other forms of recovery of such wastes so as to reduce disposal. Recycling of WEEE is an important subject not only from the point of waste treatment but also from the recovery of valuable materials.WEEE is diverse and complex, in terms of materials and components makeup as well as the original equipment's manufacturing processes. Characterization of this waste stream is of paramount importance for developing a cost-effective and environmentally friendly recycling system. In this paper, the physical and particle properties of WEEE are presented. Selective disassembly, targeting on singling out hazardous and/or valuable components, is an indispensable process in the practice of recycling of WEEE. Disassembly process planning and innovation of disassembly facilities are most active research areas. Mechanical/physical processing, based on the characterization of WEEE, provides an alternative means of recovering valuable materials. Mechanical processes, such as screening, shape separation, magnetic separation, Eddy current separation, electrostatic separation, and jigging have been widely utilized in recycling industry. However, recycling of WEEE is only beginning.For maximum separation of materials, WEEE should be shredded to small, even fine particles, generally below 5 or 10 mm. Therefore, a discussion of mechanical separation processes for fine particles is highlighted in this paper.Consumer electronic equipment (brown goods), such as television sets, video recorders, are most common. It is very costly to perform manual dismantling of those products, due to the fact that brown goods contain very low-grade precious metals and copper. It is expected that a mechanical recycling process will be developed for the upgrading of low metal content scraps.
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| 4. |
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| 5. |
- He, Mingzhao, et al.
(författare)
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Slurry rheology in wet ultrafine grinding of industrial minerals
- 2004
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Ingår i: Powder Technology. - : Elsevier BV. - 0032-5910 .- 1873-328X. ; 147:1-3, s. 94-112
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Tidskriftsartikel (refereegranskat)abstract
- Wet ultrafine grinding has been increasingly used for production of ultrafine powders in various industries. It has been known that slurry rheology significantly influences the grindability of industrial minerals in wet ultrafine grinding. This review represents some previous work with respect to slurry rheology in ultrafine grinding. In this review, some methods for the characterization of the slurry rheology and some empirical equations modelling rheological behaviours of slurries were presented. The semiempirical model incorporating slurry rheology, solids concentration, particle size and slurry temperature was described. In addition, on-line measurement for the slurry rheology control was also discussed. In the case of ultrafine grinding, various parameters (such as solid concentration, particle size and distribution, particle shape, temperature, rotation and pH, use of dispersants), which affect the slurry rheology, have been described. It was revealed that the optimization of the rheological behaviours of slurry in ultrafine grinding could increase throughput, energy efficiency and product fineness as well. It is suggested to further study the mechanisms of slurry rheology in the presence of chemical dispersants in wet ultrafine grinding. It is desired to develop a model, which can represent a relation among slurry rheology, comminution parameters, amount of dispersant, energy efficiency and particle size characterization.
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| 6. |
- Hosseini, S.H., et al.
(författare)
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Comparison between the bulk and surface composition of the samples from Angooran lead and zinc mine, Zanjan province, Iran
- 2002
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Ingår i: 6th Conference on Environment and Mineral Processing. - Ostrava : VSB - Technical University Ostrava, Faculty of Mining and Geology, Institute of Environmental Engineering. - 8024800713 ; , s. 289-294
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Konferensbidrag (refereegranskat)abstract
- The Angooran Lead & Zinc Mine located in Zanjan province, Iran is one of the largest ones of its kind in the Middle East. At present, a part of the ore body located within host rock mineralised schist is not included in the milling design. According to previous work, wet chemical assay, XRF, XRD and ore microscopy studies of the ore samples show that the ore contains Smithsonite (16%), Mimetite (0.6%), Quartz (52%), Sericite (16.5%), Kaolinite (12%), Iron Oxides Minerals (1.5%), Rutile (0.4%) and other minerals (1%). (Hosseini S.H. et al ,2001) In the present study, XPS (ESCA) and EDX have been utilized, in order to study the characterization of the surface and bulk composition respectively for three fraction of - 250, +200 μm; -200, +150 μm and -150μm. The results of XPS show that these have no difference especially in Zn percentage and also for other elements for three size fractions. It can be concluded that the surface composition are approximately the same for both three-size fractions. A comparison between the data obtained from XPS (Surface Composition) and from EDX Analysis (Bulk Composition) shows that there are some differences for the Si, Fe, and Al content in the ore sample and these differences between XPS and other techniques should be based on the amount of Oxygen for each technique.
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| 7. |
- Hosseini, S.H., et al.
(författare)
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Mineral processing possibility of oxide lead and zinc minerals from Angooran deposit in Zanjan province, Iran
- 2001
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Ingår i: Balkan Mineral Processing Congress IX. ; , s. 221-226
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Konferensbidrag (refereegranskat)abstract
- The Angooran Lead & Zinc Mine located in Zanjan province-Iran is the greatest one of its kind in Middle East. At present, a part of ore body located within host rock mineralized schist is not planned for milling project design. In the present study, the mineral processing possibility of mineralized schist deposit within Angooran Lead & Zinc Ore deposit was investigated. The ore microscopy studies were carried out to determine the mineral content of the ore deposit. The natural breakage and grindability were studied to determine the behavior of the desired ore during several stage breakages. The liberation degree of crushed ore in different size fractions was estimated by the Counting method. The Heavy Liquid Tests for three size fractions (-212+150; -150+125; -125+75 μm) were carried out in different density fractions and were assayed for lead, zinc and SiO2 content. The wet chemical assay, XRF, XRD and ore microscopy studies showed that the ore subjected to different stages included Smithsonite (16%), Mimetite (0.6%), Quartz (52%), Sericite (16.5%), Kaolinite (12%), Iron Oxides Minerals (1.5%), Rutile (0.4%) and other minerals (1%). The Locking Analysis for different size fractions showed that the size fraction of -125+75 μm to decrease the overgrinding was selected as the best amount of liberation degree and the result of HLS confirmed this, i.e. the most Zn content was in size fraction of -125+75 μm, while the applicability of gravity concentration was in size fraction of -150+125 μm. The mineral processing circuits for size fraction -150, +125 μm can be assessed for gravity concentration as a preconcentration process and for the size fraction -125, +75 μm in the flotation process in the next stages.
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