Thesis (Ph.D.) -- University of Texas at Arlington, 2008.

The work described in this thesis is divided into two parts. Part I is concerned with the volume fraction estimation of phases in metallurgical microstructures. A rapid method of phase analysis, using a modified form of point counting, is described and experiments on various kinds of cast irons are reported. [...]

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1909. / Degree of Bachelor of Science in Mining Engineering awarded in 1909 determined from "1874-1999 MSM-UMR Alumni Directory". The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed April 24, 2009)

In view of very high toxicity potential of some heavy metals to aquatic life, there is a need for critical evaluation of known methods and development of new methods for purifying water and waste-water containing heavy metals. In this study, batch tests were performed to evaluate the relative efficiencies of six British Columbia coals in removing heavy metals (copper, lead, mercury and zinc) from water. On the basis of batch test data obtained, the best two coals, Kaiser Coal-Stock Pile Refuse and Kaiser Coal-Special Plant Feed, were tested on a continuous flow laboratory scale. The emphasis was placed on metal concentrations of 2 mg/1 and less for copper, lead and zinc and 5 vg/1 for mercury. The effects of adsorbate concentration, flow rate through the column (contact time), and pH of the solution on the adsorptive capacity of coal were investigated. A solution containing 0.5 mg/1 of each of copper, lead and zinc was tested to investigate the ability of the coal to remove metals from a mixture of many metals. The adsorptive capacity of the best two coals was also compared with some commercially available adsorbents. On the basis of capacity and rate of adsorption, Kaiser Coal-Stock Pile Refuse was found to be the best of the six coals tested. For the specific testing conditions in this investigation, the better metal-removing efficiency of coal as compared with activated carbon and nitrohumic acid indicate that the coal may be a feasible alternate to purify effluents containing heavy metals / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

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Thesis (PhD (Process Engineering))--University of Stellenbosch, 2006. / In the smelting of copper waste slags to recover cobalt and copper, the prediction of the metal liquidus temperature and the associated superheat for liquid metal handling for subsequent treatments cannot be done with certainty, making the management of furnace integrity very difficult. By studying the phase equilibria and solution thermodynamics in liquid ferrocobalt new experimental data on the liquidus temperature and phase equilibria of the quaternary system can contribute to the improvement of existing copper slag smelting processes. This will alleviate the operational uncertainties and difficulties associated with ferrocobalt production in electric arc furnaces. There is no specific literature available that describes the physicochemical and thermochemical properties of the ferrocobalt produced from smelting of waste copper slags. Therefore, the quaternary system Fe-Co-Cu-Si has been characterised by studying and reviewing the binary and ternary subsystems with respect to the high temperature phase equilibria. The ferrocobalt metal has been modelled on the Fe-Co-Cu-Si quaternary system. The liquidus temperatures and phase equilibria in the Fe-Co-Cu-Si system, within the composition and temperature regimes pertinent to smelting of slag, were investigated by differential thermal analysis and metallography. Drop-quench techniques coupled with scanning electron microscopy were used to study the phase equilibria. The activity of silicon in liquid Fe-Co-Cu-Si at 1450 °C was calculated from gas-alloy-silica equilibrium experiments conducted in controlled oxygen partial pressure atmospheres at 10-13 P, 10P -14 P, and 10P -15 atmosphere (absolute) corresponding to the conditions found in the industrial application. The liquidus temperature of the quaternary Fe-Co-Cu-Si is influenced by the content of silicon in the system. When silicon is added to the Fe-Co-Cu ternary the liquidus temperature is lowered in the new system (Fe-Co-Cu-Si). In the range of silicon content studied (0 0.1) < XSi ≤ , the liquidus temperature decreased by over 70 °C. The liquidus temperature profiles of the subsystems of the quaternary Fe-Co-Cu-Si, show large composition dependence too, except in the Fe-Co system. In the ternary Fe-Co-Cu, the liquidus temperature decreases with increasing copper content and is characteristic of the profiles of the liquidus lines in the binary subsystems Fe-Cu and Co-Cu.In the dilute concentrations of silicon, it is shown that the phase equilibria in the quaternary system have attributes of the Fe-Si and Fe-Cu-Si systems. Silicon is associated more with the iron rich phase than it is with the copper rich phase. It stabilises the metastable liquid immiscibility when added to the Fe-Cu, Co-Cu, and Fe-Co-Cu in the corresponding ternary systems Fe-Cu-Si, Co-Cu-Si and quaternary Fe-Co-Cu-Si system. The activity of silicon in liquid Fe-Co-Cu-Si at 1450 °C, in the composition range 1 to 5 wt. %Si exhibits a negative deviation from ideal liquid solution behaviour. The activity coefficient approaches a constant value of 0.2×10P -3 P, with pure liquid silicon as reference state, as the silicon concentration approaches zero implying a Henrian solution behaviour. This information should be useful in the thermodynamic modelling of the system.