| 1. |
- Pugh, R.J., et al.
(författare)
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The influence of magnetic and surface forces on the coagulation of hematite and chromite
- 1994
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Ingår i: Minerals & metallurgical processing. - 0747-9182. ; 11:3, s. 133-140
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Tidskriftsartikel (refereegranskat)abstract
- The coagulation of dispersed ultrafine weakly magnetic oxide mineral particles (e.g., natural hematite and chromite) in an external magnetic field can be described by interparticle forces. Essentially, coagulation occurs when the short-range London-van der Waals interactions and the long-range magnetic forces outweigh the stabilizing electrical double-layer repulsion. Using the classical colloid chemistry theory, the various components of the potential energy for different-sized particles at a series of ionic strengths and magnetic field intensities were calculated.
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| 2. |
- Rao, K. Hanumantha, et al.
(författare)
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Flotation of mica minerals and selectivity between muscovite and biotite while using mixed anionic/cationic collectors
- 1990
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Ingår i: Minerals & metallurgical processing. - 0747-9182. ; 7:3, s. 127-132
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Tidskriftsartikel (refereegranskat)abstract
- Selective flotation of muscovite from a material containing muscovite (15.4%), biotite (13%), and siliceous gangue (quartz and feldspar), using a mixed collector system of sodium oleate and dodecylamine acetate has been described. Muscovite is found to float in preference to biotite, when the pulp is initially conditioned with oleate followed by amine at basic pH values. The results indicate that a product containing 63% muscovite with a recovery of 93% can be obtained, while using 75-150 g/t of oleate and 96 g/t of amine. The biotite grade and recovery are found to be around 30% and 20%, respectively. A good selectivity between muscovite and siliceous gangue is obtained. A final product containing 95% muscovite with an overall recovery of 75% is obtained when the flotation concentrate is subjected to magnetic separation. These studies indicate the possibility of separating muscovite from biotite by using a mixture of collectors.
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| 3. |
- Wang, Yanmin, et al.
(författare)
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The recovery of hematite and chromite fines and ultrafines by wet magnetic methods
- 1994
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Ingår i: Minerals & metallurgical processing. - 0747-9182. ; 11:2, s. 87-96
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Tidskriftsartikel (refereegranskat)abstract
- Wet magnetic separation methods for the recovery of hematite and chromite fines and ultrafines were investigated. These methods included wet high-intensity and high-gradient magnetic separation, carrier or 'piggy-back' magnetic separation, magnetic field-induced aggregation and magnetic seeding. This investigation indicated that wet magnetic separation is more efficient for fines and ultrafines. This investigation also indicated that other methods can be used to enhance the particle aggregation and/or the magnetic response. The magnetic behavior of these minerals with respect to the magnetizing field, temperature and particle size is also presented.
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| 4. |
- Zeng, Yigen, et al.
(författare)
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Energy consumption in fine crushing and dry rod grinding
- 1992
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Ingår i: Minerals & metallurgical processing. - 0747-9182. ; 9:2, s. 69-72
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Tidskriftsartikel (refereegranskat)abstract
- Fine crushing and rod grinding have been investigated using a laboratory-scale jaw crusher and a rod mill. The net energy consumption in both crushing and grinding was evaluated from torque measurements. An empirical relationship was established between energy consumption, particle size and operating parameters. When the mill feed size is reduced, through fine crushing, to about 80% passing 3 mm, the energy consumption will be minimized in a comminution chain of fine crushing and coarse rod grinding. The results in fine crushing were compared with a large-scale test.
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