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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.
191

Alkaline Pressure Oxidation of Pyrite in the Presence of Silica – Characterization of the Passivating Film

Dani, Anirudha 22 November 2013 (has links)
Alkaline pressure oxidation, particularly in the presence of trona as additive, can be used to oxidize high carbonate refractory gold ores as it prevents the formation of CO2 in the autoclave. However, the presence of silica in the ore can lead to the encapsulation of pyrite due to the formation of a passive layer. This phenomenon occurs due to the high solubility of silica in alkaline solutions and its subsequent re-precipitation on the reacting pyrite surface. The present study investigated the chemical composition and thickness of the passive layer on a rotating pyrite surface in an aqueous slurry containing silica sand, sodium carbonate and calcium carbonate at 230°C and under 7 bar of oxygen overpressure. Results obtained from XPS and SEM show that a concentration of 2.5 g/L sodium carbonate gave the maximum thickness of passivation on pyrite and that the passive layer consisted primarily of silicates and aluminosilicates.
192

A corresponding states approach for the calculation of viscosity over a wide range of temperature and pressure

Thurner, Paul Alan 05 1900 (has links)
No description available.
193

The response of a finite length tube of viscous compressible fluid to a step function in pressure

Miller, John Thomas 08 1900 (has links)
No description available.
194

A theoretical and experimental analysis of lengthwise pressure gradient for flow of air in small bore tubing considering the effect of elevated temperature

Laster, Marion Lynn 08 1900 (has links)
No description available.
195

An analytical method for the prediction of pressure lag inherent in ballistic missile pressure sensing systems when subjected to impulse-type pressure functions

Pirie, David Alexander 05 1900 (has links)
No description available.
196

Numerical modeling of the expansion phase of vapor explosions

Hwang, Moonkyu 08 1900 (has links)
No description available.
197

Vapor explosions in thermite-generated melts

Griffith, Eric F. 12 1900 (has links)
No description available.
198

On the behavior of exterior acoustic modes of structures

Currey, Mary Noelle 12 1900 (has links)
No description available.
199

The design of a pressure control system for a compressible flow test apparatus

Hinson, Roscoe McClendon 12 1900 (has links)
No description available.
200

A comparison of the methods of computing the wind stresses in buildings

Shahan, Maxwell Lee 05 1900 (has links)
No description available.

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