Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1980-04-07
1982-11-30
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
219121P, 373 22, H05B 1100, C22B 400
Patent
active
043614418
ABSTRACT:
A plasma reactor, in which particulate matter is caused to interact with low temperature plasma (i.e. below 100,000 K.) comprises spaced stationary electrode structures 2, 11 of which at least one is annular, between which an arc or arcs 7 is established by a power supply which may include a thyristor (SCR) 9. The arc is pulsated and caused to orbit or circulate round the or each annular electrode structure to form a conical plasma zone between the electrodes, while particulate solids are introduced through inlets 5 to enter the plasma zone and interact with the plasma therein. Extended dwell periods and highly effective interaction are brought about by circulation and pulsation of the arc and a high particle population density. The arc can be circulated at high speed by electrical means, for example by sequential energization of plasma torches 1 in an annular array or of the segments 8 of a segmental anode, or by electromagnetic circulation of the arc attachment round an annular cathode or round a segmental anode with the help of coils 10 fitted between the segments. Examples of reactions that can be efficiently conducted by this method include the reduction of metal ores, beneficiation of low grade chromite ores, recovery of energy values from low grade carbonaceous matter such as colliery wastes and the formation of pozzolanic material and cements from siliceous minerals.
REFERENCES:
patent: 3429691 (1969-02-01), McLaughlin
patent: 3783167 (1974-01-01), Tylko
patent: 3834895 (1974-09-01), Cachat
patent: 3843351 (1974-10-01), Smith
patent: 3852061 (1974-12-01), Wulff
patent: 3862834 (1975-01-01), Waclawiczek
patent: 3893845 (1975-07-01), Mahaffey
patent: 3936586 (1976-02-01), Tylko
Hamblyn, "Plasma Technology and Its Application to Extractive Metallurgy", Minerals Sci. Engng., vol. 9, No. 3, pp. 151-176, (Jul. 1977).
Plasma Holdings N.V.
Rosenberg P. D.
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