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Articles 3811 - 3840 of 3914
Full-Text Articles in Engineering
A Study Of The Chemical Behavior Of Some Natural Occurring Iron Disulfide Ores, William Louis Shivelbine
A Study Of The Chemical Behavior Of Some Natural Occurring Iron Disulfide Ores, William Louis Shivelbine
Masters Theses
"A complete investigation of the pyrites deposits of Missouri by Grawe has revealed many large deposits of pyrites available in commercial quantities in the Ozark area. The pyrites has been found occurring in contact with several various types of minerals. In the northcentral Ozark Plateau, pyrites is found associated with hematite-bearing sink structures. In the northwest part of the state, pyrites occurs in coal deposits, which, in the future, may be recovered as a by-product in the production and preparation of coal. Some pyrites, chiefly marcasite, has been found as fracture and cavity fillings in several other districts. The purpose …
The Solubility Of Copper In High-Iron And Low-Iron Slags, Charles Burroughs Gill
The Solubility Of Copper In High-Iron And Low-Iron Slags, Charles Burroughs Gill
Masters Theses
"A thesis giving the details of construction of a rotating induction furnace and its use to experimentally determine the amounts of copper absorbed in high-iron and low-iron slags at various temperatures. A rotating induction furnace is advantageous for slag study in that the slag is contained in a molten pure metal cup and does not come in contact with any refractory, which would be attacked by the slag and contaminate it. The molten pure metal cup is formed by melting the pure metal in a refractory crucible and spinning this inside an induction coil. The induction coil supplies heat for …
A Study Of Certain Properties Of A Cobalt-Chromium-Manganese Alloy For High Temperature Service, Robert Lewis Ray
A Study Of Certain Properties Of A Cobalt-Chromium-Manganese Alloy For High Temperature Service, Robert Lewis Ray
Masters Theses
"The vast amount of attention that has been given to the development of high-temperature service alloys since about 1940 has resulted in the production of numerous compositions for many elevated temperature applications. Particularly in the aircraft industry, with the jet engine, and the power industry, with the gas turbine, have these applications been most demanding. War research has developed a large number of high-temperature service alloys, many of which are in use today, and the alloy ingredients vary widely...it may be readily be seen that there is no one alloy, or one system of alloys which has been developed that …
Beneficiation Of A Zinc Rich Oxidized Ore From Nuevo LéOn, MéXico, Jorge Casas Nieto
Beneficiation Of A Zinc Rich Oxidized Ore From Nuevo LéOn, MéXico, Jorge Casas Nieto
Masters Theses
"Rich zinc ores are relatively rare now in this country but are still abundant in countries like México, that have not yet developed all their mineral potentialities. In almost all Mexican zinc districts there has been reported sporadic production of oxidized ores, although until now no specially designed plants have been built for the beneficiation of such ores. Generally the zinc carbonate and zinc silicate ores are hand picked and shipped to this country for beneficiation. The Mexican production of zinc ores has never been steady, because of economic factors such as bad transportation systems and lack of market for …
The Preparation Of Elementary Fluorine And Its Reactions With Certain Organic Compounds, Robert Knox Neuman
The Preparation Of Elementary Fluorine And Its Reactions With Certain Organic Compounds, Robert Knox Neuman
Masters Theses
"This work had two main objectives: (1) The construction of an electrolytic cell for the production of fluorine, (2) the preparation of some organic compounds containing fluorine. This research was undertaken because of the growing importance of fluorine chemistry, particularly in the field or organic chemistry. Due to the extreme activity of fluorine, it is theoretically possible to prepare many times more fluorine-containing organic compounds than there are known organic compounds today. It has been predicted that fluorine-containing products will be developed to include new and useful dyes, plastics, pharmaceuticals, lubricants, tanning agents, metal fluxes, fumigants, insecticides, germicides, fire extinguishers, …
Some Equilibrium Relations In The System Magnesium Oxide-Sulfur Dioxide-Water (Acid Region) At Pressures Below Atmospheric, Donat Bennes Brice
Some Equilibrium Relations In The System Magnesium Oxide-Sulfur Dioxide-Water (Acid Region) At Pressures Below Atmospheric, Donat Bennes Brice
Masters Theses
"This thesis describes the system Magnesium Oxide-Sulfur Dioxide-Water when brought to equilibrium at various pressures of sulfur dioxide plus water vapor, ranging from the vapor pressure of water at the temperature in question to atmospheric pressure. This system is of significance because it is being used more and more in the "Sulfite Process" in the manufacture of wood pulp and is replacing calcium oxide or a mixture of magnesium and calcium. The solution as it comes from the absorption towers is essentially such a system. Numerous investigators have done work on the system sulfur dioxide and water and the work …
Some Preliminary Work On Metaphosphates In Ceramics, John Frederick Burst
Some Preliminary Work On Metaphosphates In Ceramics, John Frederick Burst
Masters Theses
"For a good many years the accepted method of cementing ceramic joints was with a mixture of fire clay grog and a plastic clay binder. This did not prove too satisfactory for several reasons. Usually when enough plastic clay was added to give good workability the vitrification was lowered to such an extent that either excessive shrinkage or excessive bloating occurred, depending upon the extent to which the vitrification point was exceeded...In order to obtain a cement with high strength throughout a long firing range the manufacturers have turned to the addition of various organic binders and inorganic fluxes. Most …
Further Studies On The Effect Of Grinding Aids For Portland Cement Clinker, Charles Lee Rakestraw
Further Studies On The Effect Of Grinding Aids For Portland Cement Clinker, Charles Lee Rakestraw
Masters Theses
"In the dry grinding of cement clinker to a fine powder in which for example ninety percent or more of the particles are reduced to a fineness below that of a 200 mesh screen, it has been found that further fine grinding is extremely difficult and the energy input is out of all proportion to the further production of fine particles. This seems to be due to the fact that when the bulk of the material reaches this fineness there is a tendency of the finest particles to cling to each other and bunch or flocculate. Along with this tendency …
A Study Of The Transportation Of Mine Rock By Pumping, Howard Morris Fowler
A Study Of The Transportation Of Mine Rock By Pumping, Howard Morris Fowler
Masters Theses
"The conclusions arrived at in regard to the practicability of utilizing pumps instead of skip haulage for the removal of ore and waste from mines are entirely theoretical, as it was impossible to make actual conparative runs. These results were arrived at by comparing known or estimated costs for both types of operations. The abrasion studies were conducted in the laboratory of the Mining Department at the School of Mines and Metallurgy. The pressure tank was designed in an effort to counteract the present necessity for using single stage pumps in sand pumping, and to find a means for eliminating …
Action Of Diatoms On Clay, Joseph Harvey Renfrew
Action Of Diatoms On Clay, Joseph Harvey Renfrew
Masters Theses
"With the recent trend toward the use of higher temperatures and more severe service conditions in the metallurgical and refractories industries there has developed a constantly greater demand for high-alumina clays, that is, clays in which the alumina content is considerably above that of pure kaolinite, Alâ‚‚O₃2SiO₂·Hâ‚‚O. However, the known reserves of good diaspors are so small that ceramic engineers are already turning to basic refractories in order to have sufficient materials for work at high temperatures. Even the slightest reflection on the needs of the refractories industry will show that such substitutions are strictly limited, and possible only where …
An Analysis Of Man Power Efficiency In Drilling Procedures In The Tri-State Mining District, Julian Alban Fuller
An Analysis Of Man Power Efficiency In Drilling Procedures In The Tri-State Mining District, Julian Alban Fuller
Masters Theses
"This thesis embodies the results of an investigation, by the time study method, of certain phases of drilling procedures recently brought into practice in the Tri-State mining district. The field work was accomplished during the months of July, and August 1945; the data obtained therefrom and the analysis presented in this dissertation apply to the practice in effect at that time"--Preface, page ii.
Exploration For Barite Deposits In Cole County, Missouri, Arthur William Brune
Exploration For Barite Deposits In Cole County, Missouri, Arthur William Brune
Masters Theses
"Barite is mined in the Southeastern and Central districts of Missouri. The Counties of Franklin, St. Francois, and Washington comprise the Southeastern district, and the counties of Benton, Camden, Cole, Miller, Moniteau, and Morgan comprise the Central district. Although the latter region is the larger of the two, its production of barite is far less than that of the other. The area which is discussed in this report is in the southwestern corner of Cole County. The main points of the problem were: 1. To determine the features, if any, which apparently controlled the localization of the barite deposits in …
The Mechanical Properties Of Mine Rocks And A Standardized Test Procedure For Their Determination, Walter Edwin Lewis
The Mechanical Properties Of Mine Rocks And A Standardized Test Procedure For Their Determination, Walter Edwin Lewis
Masters Theses
"The problem involves studies of the mechanical properties of rocks and was undertaken in an attempt to determine practical data that will help in estimating the supports required to maintain the roofs of mines during and after mining operations. One of the most important problems in mining today is that of the analysis of the action of mine-rock under stresses. From such an analysis in any given mining venture it should be possible to obtain cheaper methods of mining because the supports necessary to maintain the walls and roof of an excavation may be determined on the basis of how …
The Age Hardening Of Copper-Manganese-Nickel Alloys, William James Barnett
The Age Hardening Of Copper-Manganese-Nickel Alloys, William James Barnett
Masters Theses
"The Bureau of Mines in conjunction with their Electrolytic Manganese Alloys program has developed a series of age hardening copper-manganese-nickel alloys having properties which compare favorably with those of copper-beryllium alloys...An unusual and highly desirable characteristic of these alloys is their insensitiveness to rate of cooling from the solution temperature. Air cooled and water quenched samples will have identical time hardness curves on being aged. Instead of requiring closely controlled conditions characteristic of many age hardening alloys, these alloys cannot be subjected to a thermal mechanical handling which will prevent hardening on their being subsequently heated to the aging temperature. …
Ceramic Properties Of The Clays Of The Polo Gas Field, Clarence Arthur Lambelet
Ceramic Properties Of The Clays Of The Polo Gas Field, Clarence Arthur Lambelet
Masters Theses
"In Western and Northwestern Missouri there exist many natural gas fields of such limited size and of such great dispersion that it is not economical to utilize their products by the construction of pipe lines to consuming centers. Thus a large source of natural wealth is lying idle. This wealth could be utilized, however, if some manufacturing process requiring large amounts of fuel were located in the vicinity...The availability of fuel is the reason for interest in the area, though an investigation should be made to assure the quality and quantity of the fuel in any selected area. the adequacy …
Prospecting, Developing, And Mining Bentonite Deposits, John Patrick Rasor
Prospecting, Developing, And Mining Bentonite Deposits, John Patrick Rasor
Masters Theses
"Clay and clay-like minerals are mined in many localities for a large number of uses. Most of these mines are small, seasonal operations. Common practice in these types of pits is to strip and mine clay from shallow overburden depths without the aid of careful prospecting and developing, and with little or no engineering technique. Bentonite deposits which must be continuously mined at tonnages from 5,000 to 7,500 tons per month require that the entire project be carefully planned and engineered so suitable equipment may be obtained and operational cost minimized. This thesis is concerned with the prospecting, developing, and …
Flotation Of The Oxidized Ores Of Zinc, Fred Henry Bunge
Flotation Of The Oxidized Ores Of Zinc, Fred Henry Bunge
Masters Theses
"There is no satisfactory method of concentrating the finely disseminated oxide ores of zinc. Gravity methods of concentrating such ores may be used for coarsely crystalline materials in which the zinc material is free at approximately 10- to 35-mesh or coarser. In addition, gravity methods of concentration do not give a satisfactory separation on those ores in which the gangue mineral is small. As a result there is need for a method of beneficiating various deposits of oxidized zinc ores. The two commercially important oxidized zinc minerals under consideration are smithsonite, the zinc carbonate and hemimorphite, frequently referred to as …
A Study Of Mine Scraper Buckets And Their Efficiency, Austin Bond Clayton
A Study Of Mine Scraper Buckets And Their Efficiency, Austin Bond Clayton
Masters Theses
"The use of power drawn scrapers, often called "slushing", for the moving of ore, stops filling, and waste rock has become standard practice in many mining operations. Several types of scrapers have been developed by practical application or by trial and error methods. However, a direct comparison of these scraper types under identical conditions has not been noted in a review of literature on the subject of mechanical loading. Written inquiries to authorities on scraping practice have brought replies that no previous comparisons of scraper types on a modal scale have been attempted. Therefore, the following thesis problem was set …
A Comparative Analysis Of Some Recent Mining Practices In The Tri- State Mining District, James Francis Alexander Taylor
A Comparative Analysis Of Some Recent Mining Practices In The Tri- State Mining District, James Francis Alexander Taylor
Masters Theses
"The Tri-State District, encompassing contiguous corner portions of Southwest Missouri, Southeast Kansas, and Northeast Oklahoma, has been, for many years, the leading zinc producer of the United States. However, rising labor costs and decreasing grade of ore reserves have meant that many of the mines gradually have become marginal in the economic character of their operations. In an attempt to counteract these adverse effects, steps were taken to attain lower cost mining methods, and mechanization has been introduced over a period of years. Further, the research program of the Eagle-Picher Company, the leading producer of the district, has been accelerated …
A Study Of The Separation Of Feldspar From Missouri Granite, Vernon Louis Kasten
A Study Of The Separation Of Feldspar From Missouri Granite, Vernon Louis Kasten
Masters Theses
"The greatest use of feldspar is as a flux in the Ceramic Industry where it is used in the manufacture of abrasives, floor tile, terra cotta, china, and earthenware of all types. It is also used in the manufacture of glass and enamels, and much is used as grinding medium in powdered form because it is softer than the common abrasive, quartz...Missouri Granites are composed of feldspar, quartz, mica, and other materials, which may or may not occur in all the samples. It is the purpose of this investigation to attempt a separation of the feldspar from these other components …
A Study Of Methods For The Purification And The Removal Of Color From Trinitrotoluene Wash Waters, William Wilson
A Study Of Methods For The Purification And The Removal Of Color From Trinitrotoluene Wash Waters, William Wilson
Masters Theses
"Symmetrical Trinitrotoluene is stable in the presence of moisture, but the nonsymmetrical trinitrotoluenes permit replacement of a nitro group with the formation of a nitrated cresol and nitrous acid. Nitrated cresols form salts similar to the picrates. To avoid these nonsymmetrical trinitrotoluenes the Ordinance Department, U. S. A., requires that Grade I trinitrotoluene have a solidification point of at least 80.2⁰C.². Numerous methods for purifying the crude trinitrotoluene and others for separating the nitrotoluenes have been suggested"--Introduction, page 1.
A High Alumina Concentrate From Low-Grade Burley Clay, Leonard Stearns
A High Alumina Concentrate From Low-Grade Burley Clay, Leonard Stearns
Masters Theses
"The principal source of raw material for the production of high-alumina refractories are the diaspore clays of Missouri. These highly refractory clays contain a large percentage of the mineral, diaspore, a monohydrate of alumina whose theoretical chemical formula is Al₂O₃ʺH₂O. The clays as mined contain from 85 to 65 per cent alumina...Diaspore clays as now found fill sandstone-lined "sink holes" or depressions in the parts of the district underlain by rocks of the Pennsylvanian Age. They are rough open-textured clays, grey or buff in color usually, containing the mineral diaspore in the form of shot-like particles or "oolites." There are …
Recovery Of Manganese From Oxidized Ores As Iron-And Phosphorus-Free Soluble Salts, Emil Pietz
Recovery Of Manganese From Oxidized Ores As Iron-And Phosphorus-Free Soluble Salts, Emil Pietz
Masters Theses
"There is a great demand at present for this country to develop its manganese resources. The hazards encountered because of the present international crisis make it almost impossible to import high-grade ores. Manganese is one of the most important strategic metals because it is vital to the production of steel. After the stock piles are depleted and the imports decreased, the deficit must be supplied by the domestic deposits. A great deal of research has been done to concentrate the domestic low-grade ores but new problems have always been encountered. The differences in the properties of the low-grade ores from …
Determination Of Alkalies In Portland Cement By The Dropping Mercury Electrode Method, William Joseph Smothers
Determination Of Alkalies In Portland Cement By The Dropping Mercury Electrode Method, William Joseph Smothers
Masters Theses
"In many industries whose product or products contain alkalies, the determination of the amount present is very essential from a control standpoint. This present investigation is concerned with a method for quantitative determination of sodium and potassium as accurately as by customary chemical methods and which will require less time in its operation. Portland cement is a product in which the amount of sodium and potassium present is of prime importance. This importance of the alkalies upon the behavior of concrete was first noticed in California where, after numerous tests, it was definitely shown that with certain aggregates there was …
A Study Of Base Exchange And Attendant Disintegration In Carthage Marble, Elmond Lowell Claridge
A Study Of Base Exchange And Attendant Disintegration In Carthage Marble, Elmond Lowell Claridge
Masters Theses
"The purpose of this investigation was to study the base exchange reaction occurring in Carthage marble as a possible cause of unusually rapid disintegration of Carthage marble which has been widely observed in various localities and under certain conditions. If this were found to be the principal cause of such disintegration the groundwork would be laid for research on a means of preventing it. According to Mr. R. E. Mayes, president of the Carthage Marble Corporation, forty to fifty percent of the stone quarried by this company is discarded because of large stylolitic veins. This represents a loss of many …
Manufacture Of Salt Cake By The Hargraeves Process, Philip Hall Delano
Manufacture Of Salt Cake By The Hargraeves Process, Philip Hall Delano
Masters Theses
"The Hargraeves process of manufacturing salt cake has not lived up to the great expectations that were held for the process at the time of its development...The inventors, Hargreaves and Robinson, do not pretend to have been the first to make salt cake by the action of sulfur dioxide upon common salt in the presence of air and steam; they claim only to have made the process practicable by a large number of patents. Numerous earlier patents for this reaction were taken out by others but none of these former proposals was successful; it was the details of the process …
Electrodeposition Of Copper-Lead Alloys From A 7.2 Per Cent Amine Solution Saturated With Respect To Copper And Lead. Study Of The Production Of Cupric Oxide To Be Used As Solute, Edmund Simon Roszkowski
Electrodeposition Of Copper-Lead Alloys From A 7.2 Per Cent Amine Solution Saturated With Respect To Copper And Lead. Study Of The Production Of Cupric Oxide To Be Used As Solute, Edmund Simon Roszkowski
Masters Theses
"The purpose of this work is to deposit electrolytically a copper-lead alloy from an amine solution for use specifically as a bearing metal. Generally speaking there are four classes of bearing metals: tin base alloys or the babbitts; the cadmium base alloys or the white metals; the silver alloys; and the copper-lead alloys. Additions of other metals may be employed to produce alloys with certain desirable properties"--Introduction, page 1.
The Mineral Association In Manganese Ores, With Particular Reference To The Phosphorus-Bearing Minerals And Their Removal By Leaching Methods, Daniel Chalmers Mclean
The Mineral Association In Manganese Ores, With Particular Reference To The Phosphorus-Bearing Minerals And Their Removal By Leaching Methods, Daniel Chalmers Mclean
Masters Theses
"The United States Bureau of Mines Experimental Station at Rolla has recently been conducting an intensive investigation of the amenability of Arkansas red ores to enrichment by standard ore dressing methods. These Arkansas ores are low grade with the estimated reserves running into several million tons. They can be concentrated to meet all Grade B ferromanganese specifications - with the exception of that of the phosphorus content, but in all cases the phosphorus is so high as to make the ore worthless under present conditions. This condition suggested the problem of trying to discover a method by which the phosphorus …
The Effect Of Addition Agents In Grinding Portland Cement Clinker, Eugene Farrell Hill
The Effect Of Addition Agents In Grinding Portland Cement Clinker, Eugene Farrell Hill
Masters Theses
"In the dry grinding of most materials in a ball mill or similar apparatus, a degree of fineness is eventually reached when a noticeable decrease in the efficiency of grinding occurs. The degree of fineness where this phenomenon occurs, as measured by the specific surface of the material being ground, varies greatly with different materials. The accompanying effect in all cases, however, is the formation of a coating upon the balls; this coating in the case of cement adheres tightly to the balls and increases in thickness as grinding progresses after the initial "coating' fineness has been reached. Usually an …
Photoelastic Investigation Of Short Beams, Ross R. Carrolla
Photoelastic Investigation Of Short Beams, Ross R. Carrolla
Masters Theses
"In this investigation the author used beams made of Bakelite. They were of rectangular cross-section and centrally loaded. These beams were viewed in polarized light and the maximum fiber stresses observed in that manner were compared with those computed from the flexure formula. The purpose was to determine the minimum length-depth ratio for which the latter gave fairly accurate results"--Preface, page 6.