G - Physics – 01 – N
Patent
G - Physics
01
N
73/69
G01N 15/04 (2006.01) G01N 15/12 (2006.01)
Patent
CA 1203996
ABSTRACT METHOD AND APPARATUS FOR THE DETECTION AND MEASUREMENT OF PARTICULATES IN MOLTEN METAL The invention provides a new method and apparatus for the detection of non-conductive particulates in molten metals, such as aluminum, gallium, zinc and lead, that can be liquefied and drawn into a suitable refractory container (14). The passage (26) into the container is of very small diameter (about 300 micrometers for aluminum) and it forms part of a current path between two electrodes (24,29) carrying a current of about 1 to 500 amperes. The path is surrounded by liquid metal which forms an effective Faraday cage screening the path, enabling the passage of a particulate of about 15 micrometers or larger to produce a voltage pulse between the electrodes of greater than 5 microvolts, which is detectable above the inevitable background noise, The size of the pulse gives an indication of the particle size and appropriate measurement and sampling electronically of the pulses gives a rapid evaluation (less than 3 minutes) of the particle size distribution, giving the operator an opportunity of deciding immediately whether or not further cleansing of the metal is required.
448760
Doutre Donald A.
Guthrie Roderick I.l.
Fetherstonhaugh & Co.
Limca Research Incorporated
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