Engineering Commons^™

Studies In Modulation Of Interfacial Reactions For Certain Sulphide Minerals, Robert Owen Beyaert

Bachelors Theses and Reports, 1928 - 1970

No abstract provided.

Production Of Standard-Grade Ferromanganese In An Electric Arc Furnace, Force F. Baney Jr.

Bachelors Theses and Reports, 1928 - 1970

The investigations conducted in this project were essentially concerned with the effects of various compositions of two different slag systems upon the increased recovery of manganese in a standard-grade ferromanganese.

Investigation Of The Ternary System Silver-Aluminum-Indium (Ag-Al-In), Elvin H. Beardslee

Bachelors Theses and Reports, 1928 - 1970

This thesis paper contains material pertaining to & preliminary investigation of the ternary system Ag-Al-In. Procedures in this preliminary investigation are discussed in detail.

Preliminary Examination Of The Aluminum Corner Of The Ternary System Aluminum-Silver-Indium (A1-Ag-In), Jerome J. Blake

Bachelors Theses and Reports, 1928 - 1970

In this paper the author attempts to lay the groundwork for future work on the Al-Ag-In system.

Crystal Habit Modification Of Sodium Chlorate, Michael R. Keegan

Bachelors Theses and Reports, 1928 - 1970

All single crystals have a particular habit or morphology. The crystal habit refers to the relative degree of development of crystallographic planes into surfaces which make up the external appearance of the single crystal.

In this paper, NaClO3 is used as a parent crystal. Its simple cubic habit is modified to tetrahedral by the use of impurities of SO4=, S2O3=, Cr2O7=, and NO3-. The degree of habit change is studied as a function of impurity concentration and temperature. The problem and phenomena are explained in terms of surface chemistry and thermodynamics.

Physico-Chemical Principles Of Sixteenth Century Metallurgy, Robert E. Johnson

Bachelors Theses and Reports, 1928 - 1970

Following a review of sixteenth century metallurgical literature and a discussion of Gibbs free energy, this thesis discusses thermodynamic considerations of galena (PbS) reduction by iron from a lead assay of this period. The importance of fluxes in this assay is emphasized. The discussion covers both equilibrium and non-equilibrium conditions at 1100 degrees Celsius. Possible substitutes for iron are also covered.

Information from twenty-one small controlled lead assays is correlated with the thermodynamic discussion to determine the purpose of each constituent in the assay.

The Beneficiation Of Titaniferous-Magnetite Sands, Ronald Lloyd Nordwick

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation of beneficiation methods is to develop and study possible economic methods for recovering an iron-titanium concentrate of sufficient purity to meet metallurgical requirements for subsequent direct reduction to pig iron and a high titanium slag.

Stress-Corrosion Cracking Of Brass, Paul A. Fossey

Bachelors Theses and Reports, 1928 - 1970

the mechanism of stress-corrosion cracking of brass has been sought for many years. Investigators have proposed many mechanisms, but each of these mechanisms has always had several drawbacks. This paper presents an account of experimental work done in the laboratory on this subject and compares it to the work of previous investigations. It evaluates the mechanisms presented by investigators and shows the failures of these mechanisms. A theory of Nitrogen Embrittlement is presented and an evaluation of this theory with experimental work follows.

Experimental Arc Furnace Smelting Of Titaniferous Iron Sands From The Northern Oregon Coast, Allan P. Herring

Bachelors Theses and Reports, 1928 - 1970

This investigation is an attempt to experimentally smelt titaniferous iron sands from the Northern Oregon Coast in a laboratory arc furnace.

The Effect Of Ph Upon Chelation Reactions In Montmorillonite Clays, Joseph Michael Keane

Bachelors Theses and Reports, 1928 - 1970

The purpose of this thesis is to investigate several chelation reactions and determine the effect of variable pH upon these reactions.

An Investigation Of The Sintering Of Iron-Wire Compacts, George L. Vivian

Bachelors Theses and Reports, 1928 - 1970

A study of the sintering of iron has been made by observing the rate of bonding of iron wires wound on iron spools. The specimens were sintered at a constant temperature of 850c in vacuum furnaces capable of producing pressures of 10-5 to 10-4 mm of mercury, and the growth of the bond between wires was observed as a function of time.

It has been concluded that the volume-diffusion mechanism is strongly operating in the sintering of iron at 850c, but in an evacuated system, the evaporation-condensation mechanism also contributes to the sintering process.

Attempts To Grow Metal Single Crystals By Strain Anneal, Donald James Mcmillan

Bachelors Theses and Reports, 1928 - 1970

The growth of such crystals in the solid state eliminates these problems to a considerable degree. Therefore, the purpose of this study was to grow a metal single crystal of predetermined orientation in the solid state utilizing the strain-anneal method.

Chelation Reactions In Montmorillonite Clays, Donald Edward Mahagin

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation was the study of reactions between the cations which are absorbed between the basal planes of montmorillonite clay and certain commercially-available organic reagents.

Copper Converter: Basic Research Testing With A Plastic Model Converter And Four Types Of Refractories, Arthur C. Bigley Jr.

Bachelors Theses and Reports, 1928 - 1970

In recent years there has appeared an increasing number of papers on converting operations as related to thermodynamics. This approach is a powerful, potential tool. However, the development of new ideas and changes must rely on accurate basic information.

Comminution Studies, George A. Grandy

Bachelors Theses and Reports, 1928 - 1970

Comminution, reduction in size, is one of the most important, yet least understood, steps in mineral dressing. So that more efficient comminuting devices may be designed and constructed, a better knowledge of the relationship between energy consumption and size reduction is desired. Occasional studies during the last 100 years have produced a few "laws" purporting to describe this relationship. In each case, the promulgators and supporters of these laws have presented experimental evidence for their verification. Obviously, all of these advocated practices cannot be correct. To the mill designer, the problem is "Which, if any, of these laws are valid." …

Microradiography Of Metals And Alloys Using A Medical X-Ray Unit, W. R. Byrne

Bachelors Theses and Reports, 1928 - 1970

There is no doubt that the microradiograph technique is of value to the metallurgist. A three-dimensional picture to supplement the photomicrographs should give a true picture of the microstructure. Microradiography can be used where etchants can not differentiate between the various components or where no etchant can be found suitable for a particular alloy.

Secondary Recrystallization In Copper, James E. Thompson

Bachelors Theses and Reports, 1928 - 1970

The purpose of this thesis is to study the conditions under which secondary recrystallization will take place in copper. The variables considered were the time annealing, the temperature of annealing, and the degree of cold work undergone by the specimen before it was subjected to the heat treatment.

Growth Of A Preferentially Oriented Aluminum Single Crystal, John George Bjeletich

Bachelors Theses and Reports, 1928 - 1970

When studying some anisotropic property of a specific metal, such as the critical shear stress of aluminum, it is desirable that the test specimen be a single crystal with the crystal axes preferentially oriented. Therefore, it is necessary to obtain a single crystal by one of the methods mentioned and by use of x-rays to determine the orientation. Once the single crystal is obtained and the orientation known, it is possible to grow a preferentially oriented aluminum single crystal by a method generally known as "seeding". The purpose of this thesis problem was to grow a crystal by utilizing the …

The Identification Of Montana Clays By X-Ray Analysis, James Francis Donovan

Bachelors Theses and Reports, 1928 - 1970

This investigation is concerned primarily with the determination of the various clay minerals comprising certain deposits through the state. This investigation was accomplished with the use of X-Ray diffraction equipment and it can be easily understood why this equipment has been of such benefit to the clay mineralogist.

The Macromosaic Structure Of Lead Single Crystals, Eldon J. Nicholson

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation is to examine this structure [macromosaic] to determine any properties or characteristics peculiar to it that could shed light on its cause or on the basic mechanism of crystal growth from the melt.

Autoclave Leaching Of Montana Chromite, Leonard S. Greely

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation was to determine the feasibility of caustic autoclaving of Montana chromite in order to recover the chromium in a relatively pure solution of sodium chromate.

Identification Of Inclusions In Armco Ingot Iron By The Use Of Polarized Light, Carl A. Plate

Bachelors Theses and Reports, 1928 - 1970

It is the author's hope that by systematically investigating the inclusions in ingot iron and comparing their specific properties with the properties of substances known to exist as inclusions, a rapid and accurate method may be found to identify them using a polarizing microscope. Where possible photomicrographs will be used to illustrate the results obtained so that the reader may obtain a better picture of the effects produced by polarized light.

An Investigation Of The Fundamental Factors Affecting The Green Ball Characteristics In Pellet Formation, Thomas J. Wright

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation is to determine the relative effects on the quality and characteristics of the pellets. Once the major factors effecting agglomerating materials are understood, formerly poor and nonagglomerating materials may be affected so that they will produce good quality agglomerates. Should the factors prove difficult to vary or impossible at least they may be identified and understood, thus serving as a guide for further attack or judgment in overall process design.

Separation And Concentration Of Stibiconite, William Howard Painter

Bachelors Theses and Reports, 1928 - 1970

Primarily, the purpose of this study is to separate stibiconite from associated gangue minerals. The ore containing antimony, as an oxide stibiconite, occurs in Mexico and its benefication would be an advantage to the mineral resources of that country. While the deposit from which this ore is derived is American owned, the resource is presently non-economic. A concentrate must be derived of suitable grade for its use in a smelting operation and from which metallic antimony would be produced.

An Investigation Of The Effectiveness Of Certain Organic Compounds In The Flotation Of Manganese Oxide Minerals, Johannes P. Dreyer

Bachelors Theses and Reports, 1928 - 1970

This thesis has to do with the selective flotation of the manganese oxide minerals in an ore from Charco Redondo Mine, Oriente Province, Cuba. Since a sound knowledge of the nature of the emulsion-induced flotation process of these minerals does not exist, experimental research constitutes the most valuable resource for determining the extent to which different reagents influence the process. Moreover, a correlation of experimental results with the chemical and physical properties of the minerals and reagents can lead to the improvement of existing theories regarding the mechanism of a process.

Streaming Potential Studies On Rutile, Albert R. Rule

Bachelors Theses and Reports, 1928 - 1970

This investigation was undertaken to determine some of the electrokinetic properties exhibited by rutile in solutions of various electrolytes. Results presented in this thesis are for rutile in solutions of conductivity water and in potassium chloride solutions. The data obtained in this investigation are presented graphically in the body of the thesis and are tabulated in the appendix for convenience.

Electrical Methods Of Mineral Concentration, Gordon F. Ziesing

Bachelors Theses and Reports, 1928 - 1970

The evaluation of a mineral-dressing method cannot be carried out successfully without an initial understanding of the basic fundamentals and concepts governing the operation of the method. Experimentation, governed by the understanding of the basic concepts, together with intelligent conclusions based on the experimental data, complete the evaluation of the dressing method.

Electrical concentration, being the given dressing method, will be evaluated as discussed above. As they are thoroughly covered by Mora (13), the fundamental concepts will not be given a lengthy discussion.

Stress-Induced Martensite Transformation In An Alloy Of The Copper-Aluminum-Nickel System, Gary D. Alexander

Bachelors Theses and Reports, 1928 - 1970

It was intended that the alloy be thoroughly investigated for martensite transformation that would make the alloy "super-elastic," but due to the many difficulties that arose this was not possible. Attempts to grow a single crystal from the cast alloy were not successful because of the difficulties that were encountered with the Kanthal resistance furnace (referred to later). Consequently, the growing of the single crystal was abandoned and the alloy was tested in the poly-crystalline form.

Electric Arc Furnace Production Of Standard-Grade Ferromanganese, Curtis Bates

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation is to determine an operating procedure for electric arc furnace production of standard ferromanganese. An attempt was made to determine a charge which would give steady power consumption in the furnace and at the same time keep the manganese content in the slag to a minimum.

Growth And Examination Of Calcium Single Crystals, Richard W. Roberts

Bachelors Theses and Reports, 1928 - 1970

This report is in two sections. The first section relates to a vacuum technique for growing single crystals of calcium. The second section discusses the results of an X-ray examination of crystals of zinc by the back reflection Laue method.