Metallurgical apparatus – With control means responsive to sensed condition – By treated material sampling means
Patent
1989-12-01
1991-07-09
Andrews, Melvyn J.
Metallurgical apparatus
With control means responsive to sensed condition
By treated material sampling means
75385, 75681, F27D 1900
Patent
active
050298216
ABSTRACT:
A method for controlling the magnesium content of molten aluminum includes the steps of injecting a halogen gas into the molten aluminum, sampling a portion of the resulting gases evolved from the molten aluminum, detecting the presence of constituents in the sampled gases and/or characteristics of the sampled gases indicative of the imminent evolution of unreacted halogen gas, and adjusting the rate of halogen gas injection to approach the point where unreacted halogen gas is about to be evolved. In the preferred embodiment, the halogen gas is chlorine; the detected constituents are gaseous hydrogen chloride (CHl) and aluminum chlorhydrate compounds (Al.sub.2 Cl.sub.x .multidot.(OH).sub.6-x); and the detected characteristic is the opacity of the sampled gases. The invention includes a technique for adjusting the rate of halogen gas injection so as to approach the optimal rate. The invention also includes (1) a sensor for detecting the content of HCl and Al.sub.2 Cl.sub.x .multidot.(OH).sub.6-x and the opacity of the withdrawn gases, (2) apparatus for controlling the injection of halogen gas in response to detected conditions, and (3) molten aluminum having a desired content of magnesium produced by the method according to the invention.
REFERENCES:
patent: 3850660 (1974-11-01), Inamura et al.
patent: 3958980 (1976-05-01), Szekely
patent: 4288062 (1981-09-01), Gupta et al.
Bar-on Ari
Gallaher Kenneth L.
Greenberg Jonathan S.
Neff David V.
Rothenberg Douglas H.
Andrews Melvyn J.
Curatolo J. G.
Evans L. W.
McCollister S. A.
The Carborundum Company
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