Metallurgy Commons^™

A Study Of Gas Porosity In Aluminum Casting Alloys Using Radioactive Hydrogen As A Tracer, Osborne Milton

Professional Degree Theses

"A method will be described wherein the absorption of hydrogen by aluminum is evaluated using hydrogen 3 as a tracer element. Results show that hydrogen gas is readily absorbed into the melt when it is injected directly, but is not taken on from the combustion products, that quantities of it are released when the metal freezes, and that the commonly used methods of fluxing with chlorine and nitrogen gas are of value for degassing"--Preface, page iii.

The Experimental Fabrication Of Titanium Magazines For 3 Inch 50 Caliber Twin And Single Gun Mounts, John Marshall Thorp

Professional Degree Theses

"The element titanium was discovered in 1790 by the Reverend William Gregor an Englishman from Cornwall England. Titanium is ninth in abundance or o.62 percent of the total of the elements making up the lithosphere. It is exceeded in amount only by oxygen, silicon, aluminum, iron, magnesium, calcium, sodium and potassium. Titanium is a constituent of practically all crystalline rocks and of sediments derived from them. Its chief mineralogical occurrence is as oxides in such minerals as ilmenite and rutile, which are the chief ores of titanium metal….

The titanium metal used in the project discussed in this thesis was …

The Properties Of Cold Rolled - Stress Relief Annealed 70-30 Cartridge Brass, Robert F. Hartmann

Professional Degree Theses

"Because of the possible commercial application of the proposed treatment of 70-30 brass, this work was undertaken. In addition, the data resulting from this work will result in a better understanding of the treatment of brass.

The objectives of this work were as follows:

1. Determine if higher strength and better spring properties can be realized from a process for commercial 70-30 cartridge brass wherein the regular recrystallizing anneals between rolling reductions are replaced by stress relief anneals.
2. Determine if it is possible, using the above process, to produce essentially fully recrystallized metal with an average grain size below that usually …

The Preparation Of Zirconium Powder, Herbert S. Kalish

Professional Degree Theses

"The preparation of zirconium powder by several different methods is fully described and evaluated. Most of the methods described are of a rather classical nature and these methods are discussed as taken from their original sources with suggestions for possible streamlining. Flow sheets are provided.

The first series of steps to produce zirconium powder is almost invariably the production of pure zirconium tetrachloride or pure zirconium oxide from the tetrachloride. The processes described include the sodium reduction of zirconium tetrachloride, sodium reduction of the double alkali fluorides, the calcium reduction of zirconium oxide, hydrogen embrittlement and comminution of reduction products. …

Development, Application And Operating Results Of The Center Peripheral Discharge Rod Mill, David Porter Hale

Professional Degree Theses

"The use of a rod mill for producing manufactured sand is not a recent application. A Marcy Open End Rod Mill has been operating at the plant of the Sun Sand Company, Thayer, West Virginia, since 1925. In early 1940 an 8' x 12' rod mill of the open end type was installed at Shasta. Dam, near Redding, California for sand production. In 1942 work began on Fontana Dam, a Tennessee Valley Authority Project on the Little Tennessee River. The flow sheet included two 9' x 12' high discharge rod mills driven by a single 800 H.P. motor. All of …

The Examination And Treatment Of Industrial Magnesium Foundry Wastes, Oden Cass Garst

Professional Degree Theses

"The principle forms of magnesium foundry wastes not recovered by industry are fine dusts, such as, sawdust, rotary filings and grindings, and the melting- and refining-pot drosses. The Bureau of Mines has studied waste generation and has developed processes for the treatment of dresses for the recovery of secondary ingot metal and has also developed processes for the mechanical beneficiation of fine dusts. The studies on fine dusts were continued until suitable melting methods for the recovery of ingot metal, approximately meeting the applicable specifications, were developed...Recommendations are made for improved melting methods for magnesium sawdust that increase greatly the …

Some Causes For Porosity And Leakage In Non-Ferrous Castings, Alfred H. Hesse

Professional Degree Theses

"Non-ferrous copper base alloys find many applications in industry. Among these alloys one finds the tin bronzes rather widely used for many purposes, and by delving still farther one finds pressure castings as one of their important applications. In many foundries the percentage of rejections due to leakage or porosity is quite high. This is obviously very costly since leakage is generally only found after machining. It is with a view to determine the causes for leakage in pressure castings and to devise methods for its prevention that the work described in this thesis was undertaken. It is not intended …

Die Steels And The Heat-Treatment Of Dies For Use In Die Casting Aluminum Base Alloys, Elmer Gammeter

Professional Degree Theses

"Although the casting of metals is an ancient art, it was not until recent years that metals were cast in large quantities in metallic molds. The increasing demands on the industry for greater production brought about this change which essentially involves the introduction of molds capable of producing numerous castings in preference to the use of non-metallic molds which were destroyed in making the casting"--General Consideration of the Die Casting Process, page 1.

Technical Methods Of Analysis For Mill Products, Daniel Elijah Huffman

Professional Degree Theses

"In mining and milling operations it is necessary that the assays be known as soon as possible, also that these results are more accurate than the sampling or the operation that produced the samples. This means that both speed and accuracy must be considered when selecting a method for the analysis of samples"--Technical Methods of Analysis, page 1.

Japan, Van Hoose Smith

Professional Degree Theses

"This ore is mined from a quartz vein which is refined by small seams of graphitic clay material, and the walls of the vein consist of a sort of graphitic shaley material. The above graphitic materials break down under treatment into a rather peculiar clay which was called primary colloidal slime. The milling process in use consists of stamp milling followed by the separation into sand and primary slime in Dorr Duplex Classifiers. The primary slime overflow from these classifiers, which is all practically thru 220 mesh, is thickened and treated by flotation. Normally and with a good supply of …

The Testing Of Steel For Wear By Abrasives, Thomas Evan Eagan

Professional Degree Theses

"The tests herein reported were conducted with the idea of finding a steel which would give improved wear as roll shells in the comminution of ores...Not only must the wear be considered, but also the physical properties. It is desirable to have a steel of such Tensile and impact values that no failure by breakage would occur until the shell was worn very thin. The ideal condition being to wear the shell down to zero thickness, but such cannot be accomplished"--Introduction, page 2.

Producer Gas Practice In The Steel Industry, Horace Wilfred Hodges

Professional Degree Theses

"The sources of energy for the industries are: 1. Water power; 2. coal, lignite, peat and Wood; 3. Natural and Artificial Gas; 4. Oil; 5. The Sun;s Rays; 6. The tides. The latter two sources may be eliminated from immediate practical use, owing to their cost and limited application. Therefore, the burden for many years will rest upon Water power, coal, gas and oil. We may also eliminate water power from the source of energy of the steel industry, due to the Mill's geographical location. Hence, for the near future, the steel industry's soul rests upon the production of coal, …

The Coarse Crushing Plant Of The Desloge Consolidated Lead Company, Horace Reynolds Stahl, Robert Gibson O'Meara

Professional Degree Theses

"The Desloge consolidated Lead Company is located at Desloge, Missouri, in the disseminated lead district of St. Francois County. The crushing plant was built during 1925 to replace crushing installations at three mines. The plant was designed to deliver 2,000 tons of 7 to 9 mm. feed per day to the concentrating plant. Operating conditions have since improved so that the present tonnage is about 2,200 toms of 6.5 mm. feed per day, operating 16 hours. The essential mineral is galena, more or less finely disseminated in a dolomitic gangue. The ore is comparatively soft and easily crushed"--Introduction, page 1.

On The Permanent Growth Of Grey Iron, Walter Edward Remmers

Professional Degree Theses

"After making a survey of the available information on the subject of permanent growth in grey iron castings, it was found that very little definite information is available and such as is available does not seem to satisfy all conditions. As is perhaps generally known, grey iron castings withstand a growth in volume upon repeated heating and cooling, which growth is a permanent deformation and is not a function of the temperature co-efficient"--Review of Published Work, page 3.

The Electrolytic Recovery Of Copper From Rod Mill Pickling Solution At The Hawthorne Works Of The Western Electric Company, Incorporated, James Walter Scott

Professional Degree Theses

"Early in 1924 a copper rod and wire mill equipped for this manufacture of the copper wire required to supply the manufacturing needs of the Western Electric Company was installed at the company's Hawthorne Works, Chicago, Illinois. A brief description of the way in which copper wire is made is as follows"--Introduction, page 1.

A Granular Briquet Resistance Furnace For The Electrothermic Dry Distillation Of Zinc Ores, William Mckinley Kahlbaum

Professional Degree Theses

"The work here described had for its purpose the development of a granular briquet resistance furnace for the electrothermic dry distillation of zinc ores"--Introduction, page 1.

An Investigation Of The Possibility Of A Missouri Furnace Obtaining An Iron Ore Supply From The State, Donald Foster Updike

Professional Degree Theses

"The material for this thesis and the observations and conclusions drawn are all the result of the writers connection with a group who were engaged by Brown Brothers to determine the possibility of supplying the St. Louis Coke and Chemical Company with iron ore from the state. The original idea was to try to obtain the Coke Companies complete requirement from the state. While the results are in a sense negative, the company appreciated the fact that, in a case of this kind, even negative results have a value"--Introduction, page 4.

The Chloride Volatilization Of Silver And Lead From Zinc Concentrate, Edward Phillip Barrett

Professional Degree Theses

"The Yellow Pine mine at Goodsprings, in southwestern Nevada, yields an ore nearly free from gangue constituents. The ore as mined contains 8 to 12 per cent lead, 8 to 12 ounces silver, and 30 to 35 per cent zinc, and is milled in a gravity concentration plant where separation of the lead and zinc is made. The ore is nearly all carbonate, except a small amount of galena, and the lead concentrates contain considerable zinc; the zinc concentrates contain lead and silver in quantities ranging from 3 to 7 pr cent and 3 to 7 ounces, respectively, The lead …

The Roasting And Magnetic Separation Of Wisconsin Ores And The Utilization Of The By-Products, Earl George Deutman

Professional Degree Theses

"In the Wisconsin field, the zinc blende is usually found associated with iron sulphide in the form of marcasite. This ore, after being milled and concentrated at the mines, is sent to separating plants for further treatment by roasting and magnetic separation, inasmuch as the mixed blende and marcasite concentrate, owing to the high iron content, is not suitable for the zinc smelter, and the magnetic separation scheme of separation must be resorted to"--page 1.

Metallurgical Processes Involving Surface Phenomena, Reginald Scott Dean

Professional Degree Theses

"Surface Tension of Liquid Metals. The surface tension of liquid metals is much greater than that of any other class of substances. Barkins lists the various substances in the following order as to surface tension; organic compounds, water, molten salts, metals"--Part I. General, page 1.

The Manufacture Of Sulphuric Acid By The Chamber Process At Isabella, Tennessee, Albert Leo Trent

Professional Degree Theses

"As the regions surrounding the smelteries are growing more densely populated, the companies operating in these districts find if necessary in many cases to take care of their waste gases which are injurious to the surrounding vegetation and thereby avoid many expensive lawsuits and claims from the land owners in the district...The smelters at once began to look around for some method of taking care of their fumes...The companies then began to install the more expensive process of handling their fumes by adding a sulphuric acid plant to their smeltery. This is very expensive to install but is not only …

The Heat Treatment Of Cast Steel, Fred Grotts

Professional Degree Theses

"Owing to many difficulties reported from the battle fields of France also from many sections of the United States, Mexico, Africa and South America relative to the functioning of the "Caterpillar" track an intensive research was begun early in the spring of 1919 to develop or perfect a material that could be made into intricate forms and which would have such physical properties as would withstand to a maximum degree, the abrasive action of rock and sand while at the same time having a high tensile strength and resistance to shock. A further requisite was that this material must be …

Milling Practice Of The Missouri-Kansas-Oklahoma Field As It Has Developed In The Past Two Years, Frank Stillmann Elfred

Professional Degree Theses

"The writer has limited his subject to deal with the past two years as it is only the past two years that a great deal of research has been done in the field upon milling ideas and practices; but I will briefly give you the evolution of our present milling and concentrating practices by means of the following flow sheets"--Page 1.

Metallurgy Of Steel Castings, Earl Joesting Mcnely

Professional Degree Theses

"This Thesis is in the form of a report of the observations of the author while working in the American Steel Foundries plants in various departments. The parts of the report dealing the Moulding and Inspection of castings were written while in the Indiana Harbor Indiana plant. The parts dealing with the Laboratory and Furnace Operation were written while in the Granite City, Illinois plant. The company owns and operates six other plants but the material covered in this report will, in a general way cover the operations in these plants, also, in which foundry work is carried on"--Introduction, Page …

Electrolytic And Furnace Refining Of Copper In South East Missouri, Ray Gould Knickerbocker

Professional Degree Theses

"This article treats with the production of refined ingot copper from a Copper-Cobalt-Nickel Matte. The method employed to separate Copper from Cobalt and Nickel was the electrolytic process. The information given is the result of my experience as Superintendent of the copper department for The Missouri Cobalt Company, Fredericktown, Missouri. In order to simplify the article, it shall be divided into four parts, namely (1) the quality of product delivered to the copper department; (2) the leaching plant; (3) the electrolytic plant; (4) the furnace refinery"--Page 1.

Metallurgical Bookkeeping, John Owen Ambler

Professional Degree Theses

"A system of costs and metallurgical records similar to that outlined herein is in use in a number of modern Smelters, and is of interest as showing what information is desirable for proper plant control. From a study of this information, which is usually compiled monthly in such a manner that comparisons may be readily made, it is possible to modify current practice to obtain maximum operating efficiency, and to approximate very closely the benefit that may be derived from changes in and additions to the plant itself and the methods of operation, or in the materials received and treated. …

On The Microscopic Determination Of Cadmium In Metallic Zinc, James Presley Gill

Professional Degree Theses

"A quick and accurate determination of Cadmium in Metallic Zinc by all ordinary chemical methods now in use, so far as the writer has been able to ascertain is at best only approximate. However, longer methods and very delicate ones for determining Cadmium are in use that are very accurate, but these methods are so long and so delicate that very few commercial laboratories care to use them. Now, it has been known for some time that Zinc and Cadmium do not form an alloy which when in the solid exist either as a solution or a compound. They do …

The Roasting Of Zinc Ores In The Manufacture Of Sulphuric Acid By The Contact Process, Clarence Eugene Peterson

Professional Degree Theses

"The unprecedented demand for sulphuric acid of the higher strengths (98% and higher) in the manufacture of explosives, has stimulated the zinc smelters to increased efforts in the recovery of their Roaster gases in the form of Sulphuric Acid. The Lead-chamber process is unsuitable, however, in making "strong" acid and the smelters naturally turned to the contact mass or catalytic processes. In the roasting of zinc ores practically all of the sulphur is removed as sulphur dioxide, the disagreeable odor and unmistakable injury to surrounding localities, of which, first led to the adoption of sulphuric acid plants by most zinc …

Determination Of Critical Point Of Concentrating Tables On Arizona Copper Ore, J. C. Finagin Jr., W. C. Hogoboom

Professional Degree Theses

"In the concentration of an ore by means of concentrating tables, there is a critical point in sizing beyond which the valuable minerals can not be recovered. Theoretically, the lighter gangue is washed over the side of' the table and the heavier mineral, regardless of size, is recoverable at the end, these concentrates being graded from coarse to fine sizes up the slope of the table. In practice, however, the finer sizes of concentrates are found mixed with the middlings and tailings, as indicated by the arrows on the diagram of the concentrating table shown below. The problem is to …

Electrolysis Of Neutral Solutions Of Znso₄, Knud Fabricius Hansen

Professional Degree Theses

"The purpose of the following experiments was to obtain informations concerning the character of the deposits, the efficiencey [sic], et al. in the electrolysis of neutral solutions of ZnSo₄"--Purpose, page 1.