Abstract: An electrochemical process for rapidly achieving the recovery of precious metals such as gold and silver from their ores. The ore is formed into a slurry and combined with an electrolyte such as sodium cyanide and an alkaline substance such as sodium hydroxide to increase alkalinity to at least 0.01 equiv./liter. The ore slurry and electrolyte are placed in a recovery apparatus in direct touching contact with closely spaced large area anodic and cathodic electrodes, preferably spaced apart by a distance of about 1 cm. or less. A voltage is applied to the electrodes to produce a current density in the slurry of about 10 to 20 amperes per square meter, and the slurry is agitated to provide diffusion of the ore grains into electrical contact with the electrodes to promote precious metal dissolution.

Abstract: An electrochemical process of the type for recovering precious metals such as gold and silver from their ores by adding to a slurry of the ore a cyanide complexing agent such as sodium cyanide and by electrolytically recovering the precious metal. The process is characterized by the use of small quantities, e.g., 50 milligrams per liter, of a water soluble electroconductive cationic resin, preferably polyvinylbenzyltri-methylammoniumchloride sold under the name ECR-34 by Dow Chemical Company of Midland, Michigan as an aqueous solution containing 33.7% of solids. The use of such a resin increases the amount of precious metals recovered from the ore per unit of time, improves the degree of recoverability, and improves the quality of the recovered metal.

Abstract: A probe mounting apparatus adapted for use in the deep fat frying of French fries, fish, chicken and the like, wherein the length of cooking time is to be calculated by a timing computer responsive to the temperature of a predetermined portion of the cooking medium as sensed by a probe assembly including a stiff sleeve formed of a smooth surfaced metal and containing a temperature sensing element at its end. The probe assembly is repeatably and accurately attached to the fryer and immersed with its sensory element in a precise location in the cooking medium by means of a mounting apparatus comprising: a mounting block fixedly attached in a predetermined location on the fryer and having an opening therein, such as a slot, arranged to receive the probe sleeve and to define the position of the probe's longitudinal axis in the cooking medium.

Abstract: A controllable power transferring device of the type used for controlling or regulating the application of A.C. electric power to a load by means of a reactance controlled by selectively short-circuiting a control coil with a controllable short-circuiting switch such as an SCR. The device employs a power transformer with a power core and a primary coil and a secondary coil each encircling the power core. A control core, separate from the power core, is encircled by the selectively short-circuited coil and is also encircled by one of the primary or secondary coils to subject that coil to the controlled reactance of the control core. By arranging the primary or secondary coil to encircle both independent cores, more efficient use is made of core and coil material, and more efficient controlled power transfer is obtained.

Abstract: A power transferring method and device of the controlled reactance type designed to regulate or control the application of alternating current electric power to a load. Reactance is controlled by using the signal to be controlled to develop a controlled magnetic flux in opposition to the reactive magnetic flux, the resulting flux cancellation effectively eliminating reactance. The device includes a reactance means with a core and a first coil around the core to be connected into the circuit in which power transfer is to be controlled. The opposing magnetic flux in the core is developed by a second coil around the core and having one end connected to one end of the first coil. Controllable means, such as an SCR, connect the other end of the first coil to the other end of the second coil to place the two coils in parallel. The coils are arranged on the reactor core so that parallel currents through the coils produce opposing magnetic fluxes in the core.