Recover Scrap Battery Lead by Electrolysis
One objective is the secondary recovery of metals, minerals, and other values from waste products and the development of uses for them. In line with this objective, research was initiated to develop an environmentally acceptable alternative to the pyrometallurgical processes currently used by the secondary lead industry. These processes produce 45 pct of this country’s […]
Explosive to Maximize Rock Permeability
Explosive Selection to Maximize Permeability Enhancement: As can be seen from the previous sections the single most important scaling parameter is the postshot cavity radius or sprung hole diameter. From Figures 5 and 7 it can be seen that permeability enhancement is considerably diminished at a distance of 6-10 rc from the center of the hole. […]
Crushing of Mica Ore
Crushing of mica prior to pneumatic processing technique were studied for concentrating coarse mica. Muscovite and phlogophite are the two major commercial mica minerals. However, this research was conducted exclusively with muscovite, and throughout this paper mica will mean muscovite. Two primary forms of commercial mica are (1) sheet mica and (2) scrap and flake […]
Recover Copper in Smelter Dust
The Bureau of Mines researched methods for recovering copper from cyclone and electrostatic-precipitator dusts of primary copper smelters as part of its program to maximize minerals and metals recovery from primary and secondary domestic resources. Small-scale studies showed that use of 110 pct stoichiometric sulfur and 123 pct stoichiometric carbon, based on producing a 40-pct […]
Dielectric Separator
Objective: To separate complex mineral mixtures according to their dielectric properties. Approach: Develop a laboratory-scale continuous dielectric separator to separate mineral mixtures by exploiting their difference in dielectric properties. How Continuous Dielectric Separator for Mineral Beneficiation Works Dielectric separation is defined as the separation of particles based on their dielectric properties. The uniqueness of the Bureau’s continuous […]
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 […]
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 […]