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Articles 16561 - 16590 of 16642
Full-Text Articles in Engineering
The Electrolytic Recovery Of Copper From Rod Mill Pickling Solution At The Hawthorne Works Of The Western Electric Company, Incorporated, James Walter Scott
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.
The Properties Of The Fire Clays Used For The Manufacture Of Zinc Retorts, Adolph Harmon Kuechler
The Properties Of The Fire Clays Used For The Manufacture Of Zinc Retorts, Adolph Harmon Kuechler
Masters Theses
"The ultimate object of this refractories investigation is to develop a body for zinc retorts, or changes in the method of their manufacture, that will result in better retorts than the ones now in use. In doing this, the question of permissible cost must, at all times, be kept in mind. The immediate object of the present phase of this investigation, of which this thesis covers only a part, is to determine the physical and chemical properties of the refractories (fire clays, grogs, bodies, etc.) now used for the manufacture of zinc retorts. This will be a basis for later …
The Chloride Volatilization Of Silver And Lead From Zinc Concentrate, Edward Phillip Barrett
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 …
An Investigation Of The Possibility Of A Missouri Furnace Obtaining An Iron Ore Supply From The State, Donald Foster Updike
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.
Hydro-Electric Treatment Of Joplin-Miami Zinc Concentrate, David Francis Walsh
Hydro-Electric Treatment Of Joplin-Miami Zinc Concentrate, David Francis Walsh
Masters Theses
"The Electrolytic Process is a process capable of almost unlimited mechanicalization. For obvious reasons it is more economic to treat high grade concentrates; yet, the extremely high grade concentrates are not essential. The Electrolytic Process can treat economically concentrates as low as 30.% zinc under certain conditions. It is significant that as the grade of concentrates offered for treatment is lowered, the treatment cost per ton of concentrates decreases for the Electrolytic Process; whereas, it will increase, as previously stated, for the Retort Process. It is seen then that the position of the Electrolytic Process is strengthened where lower grade …
The Reduction Of Zinc Oxide By Carbon, George August Zeller
The Reduction Of Zinc Oxide By Carbon, George August Zeller
Masters Theses
"In spite of the fact that the reduction of zinc oxide by carbon is the fundamental reaction upon which the pyrometallurgy of zinc is based, there is a decided lack of accurate knowledge concerning the mechanism of the reaction, the temperature at which it begins, and the effect of various factors upon the rate at which it takes place"--Introduction, page 1.
On Plain Carbon Steel, Walter Edward Remmers
On Plain Carbon Steel, Walter Edward Remmers
Masters Theses
"In 1921, an investigation was carried on by Messrs. Howe, Foley and Winlock, under the auspices of the National Research Council, the results of which were published under the title of - "Influence of Temperature, Time and Rate of Cooling on Physical Properties of Carbon Steel," by the American Institute of Mining and Metallurgical Engineers, February, 1923. These results showed that all physical properties of a 0.34 C. percent steel are improved by increasing the rate of cooling from temperatures above the critical range up to a certain rapidity beyond which, there is a gain in strength at the expense …
On The Breakage Of Rock Drill Steel, Muir Luken Frey
On The Breakage Of Rock Drill Steel, Muir Luken Frey
Masters Theses
"Prior to 1920 there was little attention paid to the general problem of breakage of rock drill steel. Each locality had its problem and the matter was treated as a purely local one, independent upon conditions in that particular section. But in the above-mentioned year, there arose an interest of wider scope, from what causes it is impossible to determine accurately, and the matter is now the subject of a broad investigation in which the users of rock drill steel, the United States Bureau of Mines, and the United States Bureau of Standards are cooperating...There is, to date, no satisfactory …
Effect Of Time And Temperature On Distillation Of Zinc-Lead-Silver Complex Sulphide Concentrates, Ernest Sterling Wheeler
Effect Of Time And Temperature On Distillation Of Zinc-Lead-Silver Complex Sulphide Concentrates, Ernest Sterling Wheeler
Masters Theses
"Accurate information is lacking as to the effect of temperature and time of distillation on the relative proportions of zinc, lead and silver volatilized from complex ores, and while it is evident that the possibility of the commercial treatment of these complex ores has engaged the attention of metallurgists for years, it is one that will still bear investigation even on a small scale"--Statement of Problem, page 5.
Metallurgical Processes Involving Surface Phenomena, Reginald Scott Dean
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 Roasting And Magnetic Separation Of Wisconsin Ores And The Utilization Of The By-Products, Earl George Deutman
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.
A Metallographic Study Of Copper Mattes, Edward James Torrence
A Metallographic Study Of Copper Mattes, Edward James Torrence
Bachelors Theses
"The metallographic knowledge of copper mattes or mattes in general for that matter, although extensive, is, to put it mildly, rather diversified. One authority, for instance, believes that mattes are sulphide dissolving compounds there being no eutectiferous series involved. Another believes that the matte constituents enter into a eutectiferous series, compounds being present. Still a third contends that there are no compounds formed but that a simple eutectiferous range exists between certain limits outside of which the end members of the series form solid solutions with each other. In so far as there exists seeming absolute proof for all of …
Drill Steel Investigation, Joseph Herman Rohloff
Drill Steel Investigation, Joseph Herman Rohloff
Masters Theses
"Several brands of standard grade drill steel were obtained [and tested]"--page 1.
High Speed Steel - Its History, Development, Manfacture, Metallography, And Constitution, Including An Extended Bibliography, James Presley Gill
High Speed Steel - Its History, Development, Manfacture, Metallography, And Constitution, Including An Extended Bibliography, James Presley Gill
Masters Theses
"There is no doubt but that the making of Steel was known and practiced by the early Greeks probably several centuries before the birth of Christ. There have been discoveries of pre-historic forges and smelters evidently used for the making of iron and steel and it is certain that implements made of these materials dates back to antiquity. As to the methods of making the steels of antiquity there is little known, but it is quite probable since iron has a strong affinity for carbon that in the forging of the iron it's contact with the carbonaceous fuel would absorb …
The Heat Treatment Of Cast Steel, Fred Grotts
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 …
The Manufacture Of Sulphuric Acid By The Chamber Process At Isabella, Tennessee, Albert Leo Trent
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 …
Metallurgical Bookkeeping, John Owen Ambler
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. …
Metallurgy Of Steel Castings, Earl Joesting Mcnely
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 …
Milling Practice Of The Missouri-Kansas-Oklahoma Field As It Has Developed In The Past Two Years, Frank Stillmann Elfred
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.
Electrolytic And Furnace Refining Of Copper In South East Missouri, Ray Gould Knickerbocker
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.
The Microstructure Of Some Commercial Nickel Steels, Robert Newton Stubbs
The Microstructure Of Some Commercial Nickel Steels, Robert Newton Stubbs
Bachelors Theses
"In this thesis it was the author's intention to take up the microstructure of such nickel steel as is generally employed for structural work"--page 3.
The Factors Influencing The Price Of Metals On The Metal Market, Thomas Patrick F. Walsh
The Factors Influencing The Price Of Metals On The Metal Market, Thomas Patrick F. Walsh
Masters Theses
"Every year the various engineering and industrial magazines print curves showing the rise and fall of metal stocks throughout the year. to the ordinary reader, these curves are seldom intelligible; he sees the ups and downs; he knows that the prices have risen and fallen; but he rarely knows what causes these changes -- and the curves themselves never tell. This paper tries to remedy this defect; it draws its curves, and, in the light of historical events, which it recounts, tries to determine the causes for the fluctuations in the market. it further places these factors on the curve …
The Roasting Of Zinc Ores In The Manufacture Of Sulphuric Acid By The Contact Process, Clarence Eugene Peterson
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 …
On The Microscopic Determination Of Cadmium In Metallic Zinc, James Presley Gill
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 …
Graphics And Its Application To The Progress And Cost Analyses Of A House Building Construction Company, Frank Lewis Leonard Wilson
Graphics And Its Application To The Progress And Cost Analyses Of A House Building Construction Company, Frank Lewis Leonard Wilson
Masters Theses
"In the graphical analyses of Stresses in Framed Structures, we study, by means of diagrams, the stability or equilibrium of structures and the relation between the external forces and the stresses created in the members of the frame. The principle involved is that we may represent any force both as to direction and intensity by a straight line, by considering the direction of the line to be identical with that of the force and adjusting its length according to any arbitrary unit adopted for the forces under consideration. By this means we can solve the stresses in framed structures with …
Electrolysis Of Neutral Solutions Of Znso₄, Knud Fabricius Hansen
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.
Determination Of Critical Point Of Concentrating Tables On Arizona Copper Ore, J. C. Finagin Jr., W. C. Hogoboom
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 …
A Wet Process For The Extraction Of Mercury, Robert Glenn Sickly
A Wet Process For The Extraction Of Mercury, Robert Glenn Sickly
Professional Degree Theses
"In this paper it will be the aim of the writer to deal as exclusively as possible with the Mercury Extraction Process as applied at the High-Grade Plant of the Buffalo Mines, Limited, Cobalt, Ontario, Canada. it will be necessary at times to refer to the treatment of the ore for the extraction of silver"--Introduction, page 2.
Mill Test And Conclusion Leading To The Design Of An Addition To Florida Pebble Phosphate Concentrator, Norman L. Ohnsorg
Mill Test And Conclusion Leading To The Design Of An Addition To Florida Pebble Phosphate Concentrator, Norman L. Ohnsorg
Professional Degree Theses
"The fact that 30% to 50% of the phosphate mined in this district is lost as tailing due to an inadequate method of concentration has caused no small concern and many attempts have been to develop a method, of economic value, for saving the phosphate lost"--Existing Conditions of Milling, Page 1.
Leaching Experiments On An Arizona Copper Ore, Gunnard Edmund Johnson
Leaching Experiments On An Arizona Copper Ore, Gunnard Edmund Johnson
Bachelors Theses
"The object of this thesis was to obtain a general knowledge of the problems to be solved in leaching a typical carbonate copper ore or oxidized capping of the New Cornelia Copper Co.'s ore. The experimental work previously performed far exceeds any that might be attempted in the short time allotted to this work, and the few results obtained indicate that the ore is particularly favorable for leaching"--Scope of Thesis, page 1.