Quartz did not float significantly at any pH value between pH2 and pH12 when any of the anionic collectors were used. The flotation of alumina with anionic collectors is depicted in figure 1. It can be seen that SOL functions as a good collector for alumina over most of the pH range studied, the recovery … Read more
To meet these uranium demands, larger, lower grade, and refractory ore bodies will need to be exploited. The utilization of these ores will require the development of new and improved processing technology. In its program of Advancing Minerals Technology, the Bureau of Mines is investigating innovative methods for recovering minerals and metals from low-grade and … Read more
The recovery of silver minerals occurring in a lead- zinc sulfide ore is efficiently accomplished using the above flowsheet. The process consists of selective flotation to produce a mixed silver-lead concentrate for maximum smelter return and a separate zinc concentrate. Over-grinding of silver minerals is detrimental to efficient flotation recovery, so the Unit Cell is … Read more
An analysis of a commercial flotation operation cannot be undertaken without considering the effectiveness and characteristics of the mineral collector. While many operations show satisfactory metallurgical performance, others are characterized by low recoveries of certain metals. Factors such as inadequate liberation, surface oxidation of sulfide minerals, or the adverse or depressing action of some modifying … Read more
Crushing and Grinding You will note that the Oracle Ridge project has utilized a two-stage crushing circuit with a double acting jaw crusher and cone crusher. In order to utilize this system, the jaw crusher is oversized to produce all -5 material for the cone mill with a screen in closed circuit. Normally a three-stage … Read more
Qualitative Aspects In its essentials, a flotation cell must provide for two main functions. First, it must supply air adequate in quantity and quality for satisfactory process kinetics. Air quantity can be defined on the basis of the narrow range provided in major U. S. commercial cells, for escape velocity, which averages near 1.2 m/min … Read more
Flotation circuit designs are also being influenced by operating philosophies possible with computer automation. It has been pointed out that flotation flowsheets tend to be simplified through use of online control. Logical control capability can reduce the necessity for recirculating streams, bringing circuits into open circuit mode with little or no metallurgical losses. Control techniques … Read more
This paper is a record of the first of a series of tests on sulfide minerals to be made by the metallurgical department of the University of California. The purpose of the tests here recorded is to determine the action of standard oils, oil mixtures, and addition agents on the flotation of pyrites. The question … Read more
There is a marked particle size effect on both R and K. Table V gives an example of increasingly finer grinds in flotation with a different sulfide ore blend. Within the times of grind indicated, there is a tendency for both the over-all R and K values to increase with finer grind [see also Table … Read more
