Noranda Inc.

Noranda Mines Limited

Gregory A Wint

Frank Kitzinger

Vladimir M Labuc

John M Lucas

John G Peacey

Albert Pelletier

George Houlachi

M Barakat Janjua

Michel Menard

The present invention is concerned with a probe assembly for plasma blasting or fragmenting a substance such as rock, concrete and the like. The probe assembly contains a probe made of two coaxial electrodes separated by a dielectric material; a termination box secured to the probe and coupled to an energy storage module, and containing electrical connections between the probe and the energy storage module; and dampening means for dampening the movement of the termination box and the probe after a blast.

Plasma blasting probe assembly

A method and an apparatus for on-line monitoring the quality of a purified metal sulphate solution is disclosed. The method comprises the steps of depositing metal from the purified metal sulphate solution onto a working electrode submerged in the solution by passing constant current through the solution at a current density in the range of 25 to 150 mA/cm.sup.2 for a predetermined time interval, dissolving the metal deposited on the working electrode by reversing the polarity of the potential applied between the working electrode and a counter electrode so as to pass a reverse current of the same current density through the solution until all zinc is removed from the working electrode as sensed by a sudden change in electrode potential, deriving the quality index of the solution by calculating the ratio of the dissolution time over the deposition time, and restoring the surface of the counter electrode by effecting the dissolution of the metal deposited on the counter electrode at the end of each measurement.

Method and apparatus for on-line monitoring the quality of a purified

An apparatus for measuring bath temperature of metallurgical furnaces through a tuyere is disclosed. The apparatus comprises a periscope adapted to be inserted into a tuyere, a fiber optic cable having one end connected to the periscope for receiving radiation entering the tuyere from the bath of a furnace, and a two wavelength pyrometer connected to the other end of the fiber optic cable for analysing the radiations transmitted through the fiber optic cable to provide an indication of the temperature of the bath.

Tuyere pyrometer

A magnetic testing device for detecting defects in elongated objects is disclosed. The testing device comprises a permanent magnet assembly having poles adapted to be spaced apart in the longitudinal direction of an elongated object for inducing a longitudinal magnetic flux in a section of the object between the poles of the magnet assembly which is strong enough to saturate such section of the object, a tubular pole piece substantially centered on the elongated object adjacent each pole of the permanent magnet assembly for directing the magnetic flux radially into the object at one pole and out of the object at the other pole, Hall effect devices spaced around at least one pole piece in the path of the magnetic flux for sensing the radial flux entering into the elongated object, and means for sensing the variations of such magnetic flux as an indication of loss of metallic area in the object. The magnetic testing device is also provided with a leakage flux sensor located between the pole pieces for detecting external and internal defects in the object.

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Pierrefonds, Canada

Gregory A Wint