Anionic activation in the flotation of chromite from a low-grade ore

Abstract Batch flotation testwork demonstrated that a low-grade chromite ore from Bird River, Manitoba, was best floated at pH 2 using Armac C (coco amine acetate) collector and sulphuric acid as pH modifier. A grind of 100% minus 150 fj,m was necessary for liberation, and flotation selectivity was greatly enhanced by prior desliming. A concentrate analyzing 24.2% Cr2O3 with a recovery of 90.2% was obtained, after three cleaning stages, from ore grading 6.05% Cr2O3. Total rougher collector concentration was 500 g/t and cleaner collector concentration 380 g/t. Similar grade and recovery were obtained during the pilot-plant evaluation, when a concentrate analyzing 22.3% Cr2O3 with a recovery of 93% (based on deslimed feed) was obtained for a total collector addition of 630 g/t.
Selective flotation in a region of positive surface charge implies anionic activation, and a possible flotation mechanism is suggested.
Keywords: Mineral processing, Chromite, Flotation, Industrial minerals.
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Publication: CIM Bulletin
Author(s): J.J. Baz-Dresch
Keywords: Underground mining, Exploration, Mining methods, Mine design, Mine development, Production.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: A microcomputer-controlled multi-probe K-40 monitoring system was developed internally for the Phase II mill at the Lanigan potash mine. The K-40 probes were mounted in a variety of positions in several process streams, ranging from dry ore on a conveyor belt to brines and slurries. A description will be presented of the objectives, the equipment and the difficulties encountered in correlating results.
Publication: CIM Bulletin
Author(s): D.K. Storer
Keywords: Monitoring systems, K40 monitoring system.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: The Underground Test Facility (UTF) project operated by the Alberta Oil Sands Technology and Research Authority (AOSTRA) north of Fort McMurray has achieved marked success in field testing mining access and horizontal well in situ recovery of bitumen from the Athabasca oil sands.
Mine access has provided for effective placing and operation of horizontal wells in the oil sands from a tunnel system in the underlying limestone. Performance of the in situ recovery process, Steam Assisted Gravity...
Publication: CIM Bulletin
Author(s): J.A. Hasten, R.W. Luhning, S.D. Gittins
Keywords: AOSTRA, Oil sands, Mine development, Athabasca oil sands, Underground test facility, Mineral economics.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: There has been a consistent move in recent years to continuously cast small billets while utilizing ceramic stream protection between tundish and mould. The need to have ceramic stream protection has developed from a need to improve billet surface quality by submerged pouring. The need to protect the ladle to tundish stream in conjunction with tundish to mould protection is explained.
The continuous casting of thin slabs is at the development state and will require a great deal of ceramic...
Publication: CIM Bulletin
Author(s): A.J. Rigby
Keywords: Refractory metallurgy, Ceramics, Continuous casting.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: The importance of vacuum degassing units to steel companies when used to produce extra low carbon deep drawing steels for automotive customers (I-F steels) has been established. These units are now required to vacuum decarburize and homogenize the heat, as well as be a ladle metallurgy station with final additions of alloys being made to satisfy stringent metallurgical requirements. These activities place great strain upon refractory materials. Procedures have been developed in the Armco RH...
Publication: CIM Bulletin
Author(s): Bruce H. Baker, Barry P. Schrader
Keywords: Refractory design, Metallurgy, Degassing, Vacuum degassing.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: Since the late 1970s, extensive work has been carried out at Placer Dome Inc. 's Dome Mine to develop new mining methods and equipment to improve the productivity of narrow vein mining (Mining Magazine, Oct. 1986, pp. 308-317; Mar. 1988, pp. 176-179). This work has been focused on mining vein-type deposits varying from 0.9m to 1.5 m in width using open sloping and cut-and-fill mining methods.
In 1989, the Dome Mine entered into a contract with Ram Raising Ltd., a joint venture company of...
Publication: CIM Bulletin
Author(s): B.E. Robertson, J.T. Vehkala, S.S. Kerr
Keywords: Mining methods, Productivity, Narrow-vein mining.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: Amok Ltd. /Cluff Mining operates a uranium mine at Cluff Lake in northern Saskatchewan. The project consists of one open pit and one underground mining operation along with a full-scale milling installation.
The underground sloping operations are of the narrow vein type and are done between two levels 50 m apart. The mining method is undercut with concrete backfilling. Cuts are 3.5 m in height and can be as narrow as 1.4 m in width.
Sloping operations are mechanized utilizing a CT-500E...
Publication: CIM Bulletin
Author(s): F. Lambert
Keywords: Underground mining, Equipment, Mine production.
Issue: 938
Volume: 83
Year: 1990
Text
Summary: The geochemical characteristics of Early Paleozoic volcanic rocks are used to establish the following tectono-volcanic regimes in the northeastern mainland Appalachians: foreland continental rift vol-canics; fore-arc ophiolites; island-arc volcanics; back-arc ophiolites; and back-arc ensialic volcanics. A Late Precambrian calc-alkaline magmatic arc bounds the Early Paleozoic volcanics to the southeast.
The Precambrian calc-alkaline volcanics of the Caledonian Highlands, primitive Cambro-Ordov...
Publication: CIM Bulletin
Author(s): L.R. Fyffe, C.R. van Staal, J.A. Winchester
Keywords: Geochemistry, Volcanic geochemistry, Sulphide deposits.
Issue: 938
Volume: 83
Year: 1990
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