Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 74 for “"Froth Flotation"”.
-
The effect of conditioning on froth flotation
… conditioned have been shown to greatly affect flotation grades and recovery. Most of this work is very mineral specific and centres around one or two operating variables. One of the major obstacles to understanding the effects of such pretreatment more fully, and to developing a global …
-
Model-based Computer Simulation of Froth Flotation
Froth flotation is a separation process by which particles are selectively attached to air bubbles. It is one of the most dynamically complex industrial processes in use today. This complexity has steered research towards understanding the fundamental principles of the process. Relatively few …
-
Laboratory-Scale Analysis of Energy-Efficient Froth Flotation Rotor Design
Froth Flotation is an industrial separation process commonly used in the primary enrichment of run-of-mine mineral material. Over the past 100 years, much of the process's development has come from empirical evolution, rather than fundamental understanding. While many of the governing sub-processes …
-
Study on the surface chemistry behavior of pyrochlore during froth flotation
… associated minerals is typically accomplished by froth flotation. The surface chemistry of pyrochlore is similar to many of its associated non-value minerals. Therefore, understanding the surface chemical properties of the pyrochlore for selective pyrochlore flotation will potentially aid in the …
-
Applications of CO2 in CO2-responsive foams and pyrochlore froth flotation
… the use of CO2 as a pH modifier in pyrochlore flotation. The first project is a study of foams generated with the conventional surfactant tetradecyltrimethylammonium bromide C14TAB in the presence of the CO2-switchable additive N,N,-dimethylethanolamine (DMEA) or …
-
An investigation into the froth flotation of four South African coals
Froth flotation is used extensively throughout the world to beneficiate fine (-0,5 mm) coal. However when the same technology is applied to the majority of South African coals it has proved relatively unsuccessful. As the beginning of an ongoing research program, this thesis examines the effects of …
-
Bacterial and chemical depression of pyrite in froth flotation of coal
Froth flotation was used to separate the pyrite sulfur and ash from pulverized coal samples of Illinois No. 6, Pittsburgh, and Middle Kittanning seams. In order to depress the coal pyrite in the flotation process, the coal samples were conditioned in "bacterial liquor." Iron oxidizing bacteria …
-
Precombustion desulfurization of coal by photochemical methods and pyrite depression in froth flotation
… the application of a novel pyrite depressant in froth flotation. Semiconductor photoelectrochemical catalysis was extensively examined. As much as 41% of the organic sulfur was removed and 72% overall desulfurization of micronized Illinois No. 2 coal was obtained. Zinc oxide, in colloidal …
-
Investigation of the effect of the reagent suite in froth flotation of a Merensky ore
… reagents (activators, collectors, depressants, frothers, modifiers) which are added to the flotation circuits to facilitate the separation between these minerals and the undesired gangue minerals present in the ore. The process is made complex by many surface reactions taking place, the …
-
Environmental Performance Assessment of Froth Flotation for Coal Recovery and Sulfur Removal from Ultrafine Coal Waste
… and loss of valuable resources. In the two stage flotation process developed at the University of Cape Town, froth flotation is used to both recover coal (stage 1) and remove pyritic sulfur (stage 2) from ultrafine coal waste, resulting in three outputs streams: a saleable coal product, a small …
-
Using froth flotation to mitigate acid rock drainage risks while recovering valuable coal from ultrafine colliery wastes
… of an investigation to develop a two-stage flotation process to produce: (i) a low-volume sulfide-rich concentrate that can be treated chemically or biologically or disposed of in a contained manner; (ii) a high-volume (low sulfur) benign tailings, with low ARD potential compared to …
-
Combining froth flotation and reflux classification to mitigate ARD generating potential of the Waterberg and Witbank coal ultrafines via sulfide removal
… of Cape Town (UCT) has developed a two-stage flotation process, which involves coal flotation in the first stage and pyrite flotation of the tailings in the second stage, for mitigating the ARD potential of ultrafine wastes. Research has shown that this two stage froth flotation process was …
-
An economic analysis of coal desulpharisation by froth flotation to prevent acid rock drainage (ARD) and an economic review of capping covers and ARD treatment processes
… of waste. One approach proposed is the two stage froth flotation process for separating sulphides, responsible for ARD formation, from the remaining tailings, leaving these benign with respect to ARD. Testwork results have proven its technical feasibility using porphyry copper tailings, fine coal …
-
Evaluation of the separation involved in recycling end-of-life (EOL) electronic equipment
This research work focuses on a froth flotation technique to separate two specific EOL plastics, namely High Impact Polystyrene (HIPS) and Acrylonitrile Butadiene Styrene copolymer (ABS).;The objective of this research was to investigate composition of keyboards and casings of personal computers, …
-
The Production of Low Ash Coals Using the Hydrophobic-Hydrophilic Separation Process with Novel Developments
Froth flotation is a common method in mineral processing to separate material based on hydrophobicity. This process becomes less efficient, however, as particle size is reduced. Because of this ultrafine particles are often discarded prior to froth flotation, and contributes to a substantial amount …
-
The concentration of germanium in coal
… In addition, a sample of the coal was tested by froth flotation and the effects of flotation on germanium concentration were noted. Size and specific gravity separations have given products that contain two to three times as much germanium as the feed. Solvent extraction with suitable solvents …
-
Development of a fine coal beneficiation circuit for the Twistdraai Colliery
… <850J.1m x 106J.1m fine coal. In addition, froth flotation technologies, in the form of the Microcel column and the Jameson cell were also tested in order to ascertain whether they can be suitably applied · to the Twistdraai naturally fine coal to produce a 10.0% ash steam coal export …
-
The flotation of fines
The flotation of very fine ores is desirable because of the occurrence of some ores that require fine grinding to achieve liberation. The literature has been concerned with electrical and chemical effects at the interface of finely ground minerals. The writer proposed to investigate the effect of …
-
Precombustion Removal of Hazardous Air Pollutant Precursors
… (i.e., crushing, dense media separation, froth flotation, and enhanced gravity separation). The bench-scale test circuit incorporated crushing and rewashing a coarse, mid-density product with hopes that trace element rejections would improve due to greater liberation of HAPPs. The results …
-
A preliminary investigation of microbubble flotation of fine coal
Although froth flotation is generally recognized as the most viable means of cleaning fine coal, a loss in recovery rate and selectivity is encountered when attempting to apply the process to clean ultrafine coals. In this work, batch flotation tests were conducted on several Appalachian coals …
Page 1 of 4