Six-Spheres – Cylinder & Piston – Compressive Strength Test
Six-Spheres test: The conventional test consisting of compressing the pellet between parallel flat platens does not simulate very well the environment actually encountered by the pellet. Each pellet is surrounded by similar pellets, that exert a pressure on it whose magnitude is dependent on the height of the pile, among other parameters. The most compact ways […]
CMI Centrifuge
The CMI centrifuge is a positive discharge scroll type centrifuge employing a profile wire screen mounted within a basket which is fastened to an outside rotating frame and an inside solid cone equipped with spiral flights. The belt driven gears produce a differential speed in the two (2) rotating elements. Both elements rotate in the […]
Cone Crushing, Rod Milling and Ball Milling Laboratory Testing
The two largest cost components in comminution circuits are energy consumption and metal wear which, for cone crushing, rod milling and ball milling, can be established by conducting laboratory bench scale tests. Pilot plant testing for these comminution methods is not normally required. Laborary testwork performed by Allis-Chalmers to identify these parameters are covered by: […]
Chromite Flotation
Careful studies of the fundamentals of chromite flotation have been made recently in the United States and in Poland. Palmer (1972), Palmer, Fuerstenau and Aplan (1975) and Fuerstenau and Palmer (1976) have demonstrated the importance of the presence or absence of charged metal hydroxy species in such flotation. These species appear particularly to influence anionic […]
Diamond Dredge
With regards to diamond dredges and dredging, the kings of the 1970s were Consolidated Diamond Mines and Marine Diamond Corp. both parts of the famous DeBeers company, control the coast of the Namib Desert and the waters and more important, the ocean floor and beaches of this treasure cheat of gems. So rich were the original […]
Ceramic Mold Inserts
For many years, the diecasting process has been employed by the nonferrous foundry industry. In this process, castings are produced by forcing molten metal under high pressure into reusable permanent metal molds commonly called dies. Figure 1 shows the sequence of steps normally used in diecasting. Although zinc-base and aluminum alloys account for the bulk […]
How Ball Mill Ore Feed Size Affects Tonnage & Capacity
The important of crushing your ore and rock fine and properly is often forgotten. The finer you crush, the higher your ball mill tonnage and capacity will be. The effect of ball mill feed size and how it affects circuit throughput can be hard to estimate. Here we described a method of designing a crushing […]
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. […]
Knelson Concentrator
The Knelson Concentrator relies on an enhanced gravitational force together with fluidization process to recover even very micron sized particles. First water is injected into the rotating concentrating cone through series of fluidization holes. Then feed slurry is introduced through a stationary feed tube. Once the slurry is filled in each cone, create a concentrating bed […]