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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Beneficiation of fine ores using the Longi wet high magnetic separator

Makhula, Mpho Johanna January 2014 (has links)
Magnetic separation has been used since 1955 for processing a variety of minerals from iron ore in steel production to the desulphurisation of coal. The accumulation of such fines and slimes during mining operations and the increasing global demand for quality products motivated the use of the semi-continuous pilot wet high intensity magnetic separator (WHIMS) introduced in 2008. Its unique features were considered to be favourable for beneficiating a Sishen low grade hematite-rich ore and an ash-rich Witbank coal. An automated Mineral Liberation Analyser (MLA) was used to characterise the size distribution of the hematite-rich material thereby providing an estimated grade at the same time. This type of analysis characterises mineral types in terms of particle size and elemental composition, specific density, weight percent, area of particle, particle shape, circularity and equivalent circle diameter. However, for this research study only size and elemental composition were considered. The application of the Longi LGS 500 WHIMS for beneficiating a low grade South African iron ore material was investigated by determining the effects of changing the operating parameters of pulp solids, magnetic field intensity and the pulsation frequency. This was followed by a 33 full factorial design which consisted of twenty seven (27) test matrix, with mass yield of concentrate and Fe grade selected as the main responses to the changing of the parameters. The results obtained were validated using the analysis of variance (ANOY A) and the mathematical model, which showed the variables as being significant to the investigation process, thus rejecting the null hypothesis. The significance of the variables was in the order of magnetic field intensity followed by pulsation frequency and lastly the percentage pulp solids. The model predictions and actual data were in good agreement, reporting regression coefficients ranging between 0.83 and 0.94. It was shown that a single stage magnetic separation has the potential to produce a 55% Fe product.
2

Limitations of sizing in concentration

Martin, Walter G. January 1896 (has links) (PDF)
Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1896. / W. G. Martin determined to be Walter G. Martin from "1874-1999 MSM-UMR Alumni Directory". The entire thesis text is included in file. Holograph [Handwritten and illustrated in entirety by author]. Title from title screen of thesis/dissertation PDF file (viewed October 29, 2008)
3

The determination of the critical sizes in table concentration

Miller, Julius C. Webster, John N. January 1914 (has links) (PDF)
Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1914. / The entire thesis text is included in file. Typescript. Illustrated by authors. Title from title screen of thesis/dissertation PDF file (viewed April 13, 2009) Includes bibliographical references (p. ).
4

Investigation on jigging

Jarvis, Royal Preston, January 1908 (has links)
Thesis (Ph. D.)--Columbia University. / "Transactions of the American Institute of Mining Engineers ... Chattanooga meeting, October, 1908."
5

Investigation on jigging

Jarvis, Royal Preston, January 1908 (has links)
Thesis (Ph. D.)--Columbia University. / "Transactions of the American Institute of Mining Engineers ... Chattanooga meeting, October, 1908." Also issued in print.
6

Investigation on jigging

Jarvis, Royal Preston, January 1908 (has links)
Thesis (Ph. D.)--Columbia University. / "Transactions of the American Institute of Mining Engineers ... Chattanooga meeting, October, 1908." eContent provider-neutral record in process. Description based on print version record.
7

The differential flotation of a complex head ore by the use of a single-cell, laboratory type apparatus for intermittant mechanical agitation; and a comparison of these results with those obtained with an 8-cell continuous agitation machine.

Weldon, Thomas H. January 1923 (has links)
No description available.
8

Flotation of low grade copper nickel ores.

Dewar, Charles L. January 1922 (has links)
No description available.
9

The work done by tube-mills in the wet reduction of ores.

Cooper, Corin H. January 1913 (has links)
No description available.
10

Investigation of the work of laboratory machines crushing Champion mine ore, and a comparison of their efficiency with the efficiency of the more inportant crushing machines in the Champion Mill.

Brow, James B. January 1922 (has links)
No description available.

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