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| 2. |
- Forssberg, Eric, et al.
(författare)
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Dynamic flow characteristics of thin films
- 1985
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Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 14:4, s. 163-174
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Tidskriftsartikel (refereegranskat)abstract
- Viscosity is generally cited as a chief cause for any decrease in efficiency noticed in concentration processes, particularly with undeslimed feeds, despite the fact that there is little conclusive information available on the importance of viscosity. The literature on viscosity as applied to gravity processes is critically reviewed. The dynamic flow characteristics of natural slimes containing a large amount of ultra-fine particles-exclusively clay is studied at different slime concentrations and pH. Except for some tendency to gel at low pH with low rates of shear, they behave almost as Newtonian fluids with extremely low apparant viscosities even with about 55 %-5 mu m clayey matter. At intermediate concentrations suspensions show strong gelling behavior and pH effects become pronounced. At rates of shear on concentrating equipment, pH influence becomes less significant and apparent viscosity drops greatly. A mathematical analysis of dynamic flow characteristics of thin films is made as a function of distance from the surface of the deck. The viscosity effect due to ultra-fine particles is negligible under conditions prevailing in slime gravity processes.
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| 3. |
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| 4. |
- Forssberg, Eric, et al.
(författare)
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Finmalning av industrimineral
- 1985
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Ingår i: Seminarium i mineralteknik i Luleå 6-8 februari 1985. - Stockholm : MinFo. ; , s. 183-204
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Rapport (övrigt vetenskapligt/konstnärligt)
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| 5. |
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| 6. |
- Forssberg, Eric, et al.
(författare)
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Liberation modelling of base metal ores in autogenous grinding
- 1985
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Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 14:1, s. 9-17
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Tidskriftsartikel (refereegranskat)abstract
- According to a mathematical model, each mineral has its own liberation-energy characteristic curve which can be plotted. The relations between liberation, mill speed and charge volume are also presented.
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| 7. |
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| 8. |
- Forssberg, Eric, et al.
(författare)
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Shape and liberation studies on grinding products from autogenous and conventional mill using an automatic image analyser
- 1985
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Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 14:6, s. 283-288
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Tidskriftsartikel (refereegranskat)abstract
- Samples were collected from the Stekenjokk and Malmberget concentrators, operated by Boliden Mineral AB and Luossavaara-Kiirunavaara AB respectively. The Stekenjokk ore consists of massive pyrite with disseminated chalcopyrite and sphalerite; it assays 1. 4 % Cu and 3. 2 % Zn. The Malmberget ore mainly contains magnetite with a coarse-crystalline structure; run-of-mine ore assays are about 40 % Fe and 0. 6 % P. Using an automatic image analyzer, it appears that fully autogenous grinding down to flotation fineness results in better liberation and particle shape for flotation than is obtained with a combination of primary autogenous and ball mill grinding. Fully autogenous grinding also creates smoother particle surfaces.
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| 9. |
- Forssberg, Eric, et al.
(författare)
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Shape and surface properties of the particles liberated by autogenous grinding
- 1985
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Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 14:1, s. 25-32
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Tidskriftsartikel (refereegranskat)abstract
- Autogenous grinding produces rounded particles with higher degrees of liberation and equiaxiality and lower roughness. These properties result in a higher grade concentrate and better recovery. Autogenous grinding is consequently more economical.
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| 10. |
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