Metallurgy Commons^™

Preliminary Construction Of A Photo-Electric Cell Concentrator, Stanley S. Williams

Bachelors Theses and Reports, 1928 - 1970

The separation of the valuable portion from the waste portion of an ore is an individual problem for every ore. However, the various methods for accomplishing this end, more or less classify themselves by the physical properties of the constituents of the ore. Most of the properties of minerals have been utilized in some way or other to affect the separation of the valuable from the invaluable parts. Practically nothing has been done so far with color and luster to attain this purpose.

It is believed that the photo—electric cell could also be used in concentrating a certain class of …

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 …

Some Early Geologists And Their Work In Montana, John E. Blixt

Bachelors Theses and Reports, 1928 - 1970

This paper marks an increased refinement and more detailed accuracy in the description of the geological features of the state. It includes the recent studies of mineral deposits, of oil structures, of the formations of bedded rocks and their included fossils, carried on both by the Federal and State governments and by various interested private persons, such as the mining companies. It is within this period that the Federal Government encouraged the U. S. Geological Survey in the publication of monographs on the National Parks, papers of great popular interest and educational value making these beautiful regions comprehensible in their …

A Preliminary Study Of The Separation Of The Copper Sulfides From Sphalerite And The Effect Of Certain Reagents On Some Of The Pure Copper Minerals In Synthetic Mixtures, Gailen T. Vandel

Bachelors Theses and Reports, 1928 - 1970

The problem of separating the copper sulfide minerals from sphalerite, in copper - zinc ores, has been a difficult one. This is largely due to the lack of adequate research and the small amount of data obtainable on the behavior of copper and zinc sulfide minerals in flotation circuits.

A Study Of Anode Corrosion And Its Influence On Cathode Purity In Electrolytic Zinc Production, Harold John Roesser

Masters Theses

"Anode corrosion is a problem with which electrolytic zinc producers have been concerned from the beginning of the practice. It has been attacked here from the view of modern practice, using alloyed anodes"--Introduction, page 1.

Flotation Of A Western Complex Ore, Guy Verdier Martin

Masters Theses

"The flotation of the complex sulphide ore, which is the subject of this investigation, has been in progress on a large scale for several years. As the operation has been successful it follows that the ore dressing methods have been developed in much detail. For further improvements an intense investigation is required. The complex nature of the ore opens many avenues of research along some of which clues may be found that will lead to ultimate savings. It is along a few of these avenues that this investigation has been directed. Hence an effort was made to add to the …

Comparison Of Results Obtained On Ores From The Tri-State Zinc-Lead District After Grinding To Different Sizes And Concentrating By Flotation, Hans Maucher

Masters Theses

"The purpose of this investigation is to compare the phenomena observed in concentrating a zinc ore by flotation, using a constant and new flowsheet as described a few pages later and varying only the sizes to which the headsamples are ground previous to each test"--Summary, page 1.

The Electrical Resistance Of Metals And Alloys In Their Hard And Soft States, Noah David Gerchesvky, Charles Becker Hoskins

Bachelors Theses and Reports, 1928 - 1970

It is known that the electrical resistance of annealed metals is usually smaller than that of metals in their cold worked state. The curve showing the relation between electrical resistance and annealing temperature reaches a minimum; continued annealing at higher temperature produces an increase in the electrical resistance. In the case of alloys it has been noted that a second decrease occurs at higher annealing temperature.

The following work corroborates the observance of previous investigations. The electrical resistance of cold worked copper, gold, nickel, and iron decreased with annealing and then increased, the minimum being around 300° C. or 400° …

Comparison Of Moe's Scale Of Hardness With The Rockwell, Brinell, And Scaleroscope Scales., Herbert William Hard

Bachelors Theses and Reports, 1928 - 1970

Moe's scale of hardness as used in mineralogy is admittedly rather indefinite, and no exact hardnesses are measured. The Rockwell, Brinell, and Scaleroscope machines give quite definite results which may be easily reproduced at any time.

The purpose of this investigation is to determine whether any definite relation exists between Moe's hardness and the hardness as measured by those machines commonly used for the determination of hardness of metals. If such a relation were found it would provide a more definite and accurate measure of the hardness of minerals.

Constitution And Specific Gravity Of The Ternary Mattes Cu2S-Sb2S3-Pbs, Herbert William Hard

Bachelors Theses and Reports, 1928 - 1970

The constitution of the ternary mattes Cu₂S PbS Sb₂S₃ has never been completely investigated nor has there been any attempt to draw the complete ternary diagram. The following work is intended to [be] a contribution towards completion of this diagram by determining the specific gravity of different mattes and by pointing out some which show peculiarities of structure.

Pipes In Steel Ingots As Exemplified By Casting Wax, Herbert William Hard

Bachelors Theses and Reports, 1928 - 1970

This paper presents some experimental data on the size and position of pipes steel ingots as exemp1ified by casting wax under various conditions and noting the size and location of the pipes formed.

The results tend to show that the length of the pipe is decreased by:

1. Slow casting

2. By casting large end up instead of down

3. By retarding the cooling of the top

The Effect Of Cobalt Upon Current Efficiency In The Electrolysis Of Zinc Sulphate Solutions, Joseph Newton, Louis Sanders Nuckols

Bachelors Theses and Reports, 1928 - 1970

The detrimental effect of the presence of cobalt upon the current efficiency, in the commercial production of zinc by electrolysis, has been recognized for some time. Most authorities differ upon the maximum amount of cobalt allowable. This is due to the fact that the presence of other impurities either increases or diminishes the detrimental effects of the cobalt.

The following tests were made with the object in view of ascertaining the relation, if any, between the amount of cobalt present and the current efficiency during the electrolysis of an otherwise pure zinc sulfate solution.

The results obtained from these observations …

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 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.

A Power Study Of A Laboratory Ball Mill, Frederick Clearman

Masters Theses

"Ball milling practice in the ore dressing industry is largely empirical. Although many investigators have worked on various of its phases, the present operating methods are mostly a matter of cut-and-try, with the result that the industry is not guided by its underlying principles. Consequently, practice varies extensively with regard to nearly all conditions of operations. Even in neighboring concentrators such factors as speed, ball charge, and ore load differ in similar ball mills. Since fine grinding is continually becoming of more importance, and often accounts for thirty per cent of the milling cost, it is very necessary that a …

Laboratory Concentration Of The Missouri Iron Ores Of Iron Mountain And Pilot Knob, Strathmore Ridley Barnott Cooke

Masters Theses

"The purpose of this investigation was to ascertain whether the more important iron ores of Missouri would be amenable to beneficiation to produce high grade concentrates. In the southeastern section of Missouri are found many small deposits of high grade iron ores, and a few large deposits of comparatively low grade ore. The former consist chiefly of red and brown hematite and limonite ores that are in no need of beneficiation. the low grade iron orebodies are relatively large in extent, and, if they could be beneficiated successully [sic] and economically would be of value. Accordingly, the major portion of …

Salts In Tri-State Mill Waters: Their Ill-Effect On The Flotation Of Zinc And Their Removal, Warren Lincoln Howes

Masters Theses

"The application of the flotation process has become one of the greatest innovations in modern ore dressing. In a comparatively short span of years it has grown to be one of the most powerful tools of the ore dressing engineer. Flotation is particularly adapted for the recovery of finely ground mineral and has thus enabled the miner to open up enormous deposits of low grade, disseminated ores for profitable treatment. In conjunction with other methods, the process has raised the recovery in practically every ore dressing plant by the treatment of slimes which otherwise would go to waste, carrying valuable …

Constitution And Specific Gravity Of The Ternary Mattes Cu2S-Fes-Pbs., William Earl Lindlief, John Otto Groh

Bachelors Theses and Reports, 1928 - 1970

The constitution of the ternary mattes CU₂S-FeS-PbS has never been completely investigated. Fulton and Goodner 1) have investigated the binary mattes CU₂S-FeS, CU₂S-PbS, PbSFeS and have shown that the three binaries show eutectics. There has been no attempt however to draw the complete ternary diagram. The following work is intended to be a contribution toward the completion of this diagram by first of all pointing out those mattes which separate on melting into two layers, and second by determining the specific gravities of mattes of different compositions.

The Effect Of The Cu:Fe''' Ratio Upon The Current Efficiency In The Electrolysis Of A Copper Sulfate Solution Containing Iron Sulfate, Joseph Thomas Roy, Francis Carroll Moran

Bachelors Theses and Reports, 1928 - 1970

It is a well-known fact that, in the electrolysis of a CuSO₄ solution containing iron sulfate, using insoluble anodes, with the depletion of copper, the point is finally reached where the current efficiency becomes zero. This decrease in current efficiency is due to the oxidation of the ferrous sulfate to the ferric condition at the anode, by the oxygen liberated. The resulting ferric sulfate diffuses over to the cathode and there dissolves copper from the cathode according to the chemical equation Cu + Fe₂ (SO₄)₃ = CuSO₄ + 2FeSO_4. This copper, which has …

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.

Beneficiation Of Manganese Ores, Michael V. Healey

Masters Theses

"The purpose of this investigation is to study the means of beneficiating domestic manganese ores in order that a marketable product may be made. Within the limits of the paper the term "Manganese ores" is applied to those ores mined primarily for their manganese content, to the exclusion of manganiferous iron and silver ores"--Object, 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.

Effect Of The Use Of Old Retorts As Grog And Of Zinc Oxide Upon The Properties Of Bodies For The Manufacture Of Retorts, Elmer Gammeter

Masters Theses

"In the fall of 1924 the Mississippi Valley Experiment Station of the United States Bureau of Mines, Department of Commerce, in cooperation with the Missouri School of Mines and Metallurgy began an investigation of the properties of raw materials used in the manufacture of retorts for the zinc industry. The investigation proceeded cooperatively until December, 1926, when the Bureau of Mines withdrew from ceramic research. The School then took over and is completing the problem as outlined. The first phase of the investigation had for its object the determination of the properties of the fireclays and body mixtures now in …

The Properties Of Refractories In Zinc Metallurgy. Part Iii. Comparison Of Various Clays, Richard Elkanah Sears

Masters Theses

"This thesis...contains a description of a part of a general investigation on the subject of the refractories used in the distillation of zinc. This investigation has been in progress for the past eighteen months at the Mississippi Valley Experiment Station of the United States Bureau of Mines, Department of Commerce, in cooperation with the School of Mines and Metallurgy of the University of Missouri. The first phase of this investigation had for its theme the determination of the properties of the fire clays and body mixtures now used in the manufacture of zinc retorts. The second phase deals with the …

Electrothermic Dry Distillation Of Zinc, Ira Nathan Goff

Masters Theses

"Although the work described in this thesis cannot be considered as complete, until certain mechanical changes have been made and the furnace operated continuously over a considerable period of time, this electrothermic dry distillation process for the extraction of zinc from ores offers excellent commercial possibilities. The literature has been reviewed, the process that was used at East St. Louis described, and the results of work at the Mississippi Valley Experiment Station of the United States Bureau of Mines, Department of Commerce, Rolla, Missouri along the line of electrothermic metallurgy of zinc considered"--Summary, page 58.

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.

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 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

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.