Induction Heating in Fire Refining of Silver & Gold
The use of induction heating as an alternative to gas or oil fired heating for the fire, refining of precious metals is attractive for several reasons: (1) compactness, (2) less waste heat, therefore cooler room temperatures, (3) cleaner operation, (4) no off-gas discharge, (5) energy efficient as less material heated and (6) less time to […]
Carbon in Pulp Plant
Sslurry at a rate of approximately 3.785 cu. m. per minute (1,000 GPM) is placed in contact with activated carbon. A simplified flow-sheet of the CIP Plant is shown in Figure 2. For years it has been known of the affinity of activated carbon to adsorb preferentially the gold and silver in cyanide complex form. […]
Rock Boulder Exploding Techniques
Several products have come on the market in recent years that improve the safety of secondary blasting operations. The most significant of these are binary explosives, exploding bridgewire electric blasting caps, and nonelectric systems. Binary Explosives Binary explosives are two nonexplosive materials that become cap sensitive, high energy explosives when mixed. One part can be […]
Rock Boulder Crushers
In mining and quarryinq, the mineral commodity as present in the ground may be composed of rock blocks that must be reduced in size, to suit market requirements. The rock in place will be blasted, loosened, and then hauled away to the first processing step-size reduction. As delivered from the blasting area the rocks will […]
Magnetic Fluids Experiment
Man’s material wealth has usually started with fairly concentrated ore bodies that are mined, beneficiated, refined, and then manufactured into material objects. Following their use and abuse, the objects are discarded and wind up as spots of rust while the sources of raw materials become scattered haphazardly over the lithosphere. Mining and metallurgical sorting practice […]
Extraction of Chromium from Chromite Ore
Chromium has a wide variety of applications in the modern world. Its major uses are in stainless steels and the plating of metals. Other important uses include alloy steel, heating elements, pigments, leather processing, catalysts, and refractories. Of the chromite ore imported into the USA, the metallurgical industry consumed about 59 pct, the chemical industry […]
Zinc Concentrate Roasting & Cadmium
Cadmium is not the principal recoverable constituent in any ore, but it does occur at a ratio of about 1:200 with zinc. If lead and zinc are considered major products, then the major metal byproduct of the zinc industry was the more than 3 million pounds of cadmium produced in the United States in 1978 […]
Autogenous Grinding & Semi Autogenous Grinding Circuits
Size reduction is the most expensive operation in most mills. Crushing and grinding usually require the greatest portion of capital costs and often make up 60-70 percent of total mill operating costs as shown in Figure 1. Selection of the proper crushing and grinding method must, therefore, be done with great care to be sure […]
Grinding Circuit Simulation
These programs and the simulation algorithms are discussed below. Note that in some Grinding Circuit Simulations, a residence time distribution model is used. In the MRRC simulation package, however, only the two extremes of well mixed and plug flow through the mill are considered. This approach reduces the amount of input information and computation required […]
Zinc Regrind
The flotation section starts with a bulk concentrate float for lead and copper using four rows of eleven cells each as roughers and scavengers. The froth taken off the roughers is then pumped to a two stage cleaner circuit. Scavenger froth and cleaner tails are returned back to the head of the rougher circuit. Froth […]