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Articles 39421 - 39450 of 40197
Full-Text Articles in Physical Sciences and Mathematics
A Study Of The Differential Seperation Of Galena And Sphalerite, Wilfred E. Nagel
A Study Of The Differential Seperation Of Galena And Sphalerite, Wilfred E. Nagel
Bachelors Theses and Reports, 1928 - 1970
The smelting of complex lead ores is a difficult operation, especially when they contain considerable amounts of iron and zinc. When these ores are smelted, all of the zinc, which is valuable and well worth recovering, goes into the slag. With the advent of the flotation processes, and the ability of these processes to concentrate the lead and zinc minerals into separate products, the smelting of complex lead ores was to a great extent simplified.
The Christensen Sillimanite Deposit Southeast Of Dillon, Montana, Everett O. Bracken
The Christensen Sillimanite Deposit Southeast Of Dillon, Montana, Everett O. Bracken
Bachelors Theses and Reports, 1928 - 1970
The minerals sillimanite, kyanite, andalusite, dumortierite, and topaz comprise a group of minerals whose high alumina content and physical properties are particularly desirable in the manufacture of refractory products. Sillimanite is the least plentiful of the minerals of this group, and for this reason it is not used extensively at the present time. However, it would be very desirable to the refractory industry if a suitable domestic source of supply could be established.
A Mineral Dressing And Economic Study Of A Complex Arsenical Ore, Luigi D. Piana
A Mineral Dressing And Economic Study Of A Complex Arsenical Ore, Luigi D. Piana
Bachelors Theses and Reports, 1928 - 1970
The factors that influence the choice of a method for treatment of an ore comprise the technical and economic limitations and advantages, derived in detail and balanced according to the exigencies of the particular situation.
Separation Of Cadmium From Zinc In The Purification Step Of The Leaching Cycle, L. C. Powell
Separation Of Cadmium From Zinc In The Purification Step Of The Leaching Cycle, L. C. Powell
Bachelors Theses and Reports, 1928 - 1970
The purpose of this investigation is to determine the effect of the factors listed previously by conducting a series of tests that will indicate the extent to which the purification is influenced by time, temperature, zinc oust size, zinc dust quantity, iron concentration, two stage precipitation, and aeration.
An Investigation Of The Precipitation Of Cobalt With Zinc Dust, Lyle Hallberg
An Investigation Of The Precipitation Of Cobalt With Zinc Dust, Lyle Hallberg
Bachelors Theses and Reports, 1928 - 1970
Cobalt, as well as copper, cadmium, and other impurities, is removed by selective precipitation with zinc during the zinc electrolyte purification cycle, and the purification residue may be treated by a Cadmium Plant for the recovery of cadmium.
Construction And Operation Of A Laboaratory Size Thum Cell, Raymond Dugdale
Construction And Operation Of A Laboaratory Size Thum Cell, Raymond Dugdale
Bachelors Theses and Reports, 1928 - 1970
Electrolytic silver refining was not perfected until the end of the nineteenth century. During the process of development, two systems of silver refining have come into prominence: the Moebius and the Thum types.
An Investigation Into The Precipitation Of Copper From Mine Water, Using Sulfur Dioxide To Reduce The Ferric Ion Content, David S. Gleason
An Investigation Into The Precipitation Of Copper From Mine Water, Using Sulfur Dioxide To Reduce The Ferric Ion Content, David S. Gleason
Bachelors Theses and Reports, 1928 - 1970
The experiments which were preformed showed that sulfur dioxide would reduce the ferric ion content of the mine waters to a very low figure. The reduction in the ferric ion content would improve the efficiency of the precipitation process, and also increase the recovery of copper.
Application Of The Electric Furnace To The Melting Of Cathode Copper At The Tacoma Smelter, Alvin H. Nelson
Application Of The Electric Furnace To The Melting Of Cathode Copper At The Tacoma Smelter, Alvin H. Nelson
Bachelors Theses and Reports, 1928 - 1970
In the field of copper metallurgy, the major changes effected in the original metallurgical scheme have been based largely upon the lowering in grade of copper ores, and the more particular demands of the fabricators of the metal. The former trend fostered the development of mineral beneficiation, which in turn caused the conversion from blast furnace to reverberatory furnace smelting.
An Investigation Of Silicon Impregnation Of Low-Carbon Steels, Thomas E. Groce
An Investigation Of Silicon Impregnation Of Low-Carbon Steels, Thomas E. Groce
Bachelors Theses and Reports, 1928 - 1970
A problem of metallurgy during the last part of the Nineteenth and the early Twentieth Century, and one that stood very near the front, was investigations of methods to produce a non-corrosive surface on iron and steel without affecting the physical properties of these base metals.
Aluminum - Bronze Compacts And Their Possible Use As A Bearing Material, Donald J. Mcmaster
Aluminum - Bronze Compacts And Their Possible Use As A Bearing Material, Donald J. Mcmaster
Bachelors Theses and Reports, 1928 - 1970
In the modern aspect of powder metallurgy, the first use of a sintering process was in making filaments for incandescent electric lamps.In the short while from the day of Edison to the present, the science of working with metal powders has advanced by leaps and bounds.
A Study Of The Transformation Of A Twenty-Eight Per Cent Tin Bronze, Perry A. Boukind
A Study Of The Transformation Of A Twenty-Eight Per Cent Tin Bronze, Perry A. Boukind
Bachelors Theses and Reports, 1928 - 1970
In this investigation, attention is directed to the phases covered by a 28 per cent tin alloy. When the investigation was started, consideration was given to the possibility of making a Time - Temperature - Transformation curve for this particular alloy. As the work progressed and further research was carried on, this phase of the work was abandoned.
Caustic Leaching Of Montana Chromite, Chester Freshour
Caustic Leaching Of Montana Chromite, Chester Freshour
Bachelors Theses and Reports, 1928 - 1970
Chromite is the most important ore used for the production of chromium and chromium alloys. At present, the domestic production is insignificant as compared with the amount of chromite consumed in the United States.
The Characteristics Of The Electrolyte In The Series System Of Electrolytic Copper Refining, Carl W. Howald Jr.
The Characteristics Of The Electrolyte In The Series System Of Electrolytic Copper Refining, Carl W. Howald Jr.
Bachelors Theses and Reports, 1928 - 1970
Almost everyone is familiar with the tremendous importance of copper in our everyday life. One of the properties of copper which determines its great usefulness to mankind is its electrical conductivity. This property alone has more to do with the prominence of copper among useful metals then does any other.
The Casting Of Anodes For The Series System Of Electrolytic Copper Refining, Robert R. Kupfer
The Casting Of Anodes For The Series System Of Electrolytic Copper Refining, Robert R. Kupfer
Bachelors Theses and Reports, 1928 - 1970
The electrolytic refining process, while usually considered an auxiliary process used in conjunction with pyrometallurgical extraction, deserves a special niche in the complex metallurgy of copper. The development of electrolytic copper refining, for example, is largely responsible for the prominence of the electrical industry. Conversely, it could be stated that the electrical industry played an important part in the development of the copper industry.
Chromizing Of Steels, Edward Buchanan
Chromizing Of Steels, Edward Buchanan
Bachelors Theses and Reports, 1928 - 1970
In recent years, considerable thought and study have been given to the use of chromized articles in place of chromium stainless steel articles. The present extensive application of chromizing, indeed, helps greatly to conserve this valuable metal.
The Psilomelane Mineral Of The Butte District, Montana, Logan E. Davis
The Psilomelane Mineral Of The Butte District, Montana, Logan E. Davis
Bachelors Theses and Reports, 1928 - 1970
During the last few years a great deal of research has been done in connection with the black manganese oxide minerals. This is especially true of the so called mineral psilomelane. It has been proven without a doubt that the name psilomelane has been used in the past to include a great variety of similar black manganese oxide minerals. By the use of X-ray equipment these minerals have been definitely identified.
An Isopach Map And A Discussion Of The Cambrian Strata In The Central Cordilleran Area, Rudi Forhan
An Isopach Map And A Discussion Of The Cambrian Strata In The Central Cordilleran Area, Rudi Forhan
Bachelors Theses and Reports, 1928 - 1970
In the past few years intensive studies have been going on concerning Cambrian formations as a locale for orebodies. Many of the dolomites and limestones of southwestern Montana are susceptible to replacement by mineralizing solutions, especially when overlain by a rather impervious layer of shale, as is the Pilgrim limestone of Upper Cambrian time.
An Isopach Map And Discussion Of Triassic Strata In Southern Montana And Wyoming, Robert G. Thompson
An Isopach Map And Discussion Of Triassic Strata In Southern Montana And Wyoming, Robert G. Thompson
Bachelors Theses and Reports, 1928 - 1970
Oil and gas have been found in the Triassic strata of Wyoming. Although the Triassic has not as yet proven to be a large producing horizon it is very probable that additional oil will be found in Triassic strata in the future, and it is one of the goals at which oil well drillers aim their tools.
Operation Characteristics Of The Series System For Electrolytic Refining Of Copper, John T. O'Donnell
Operation Characteristics Of The Series System For Electrolytic Refining Of Copper, John T. O'Donnell
Bachelors Theses and Reports, 1928 - 1970
In the copper electrolytic refining operation, two main objectives are desired: the first is the production of a metal of desired chemical composition and physical characteristics, and the second is the recovery of the valuable by-products.
Daibase Sill Comanche County, Oklahoma, Jean A. Hardesty
Daibase Sill Comanche County, Oklahoma, Jean A. Hardesty
Bachelors Theses and Reports, 1928 - 1970
The mechanics of intrusion and the processes involved are becoming of more and more interest to contemporary geologists, because most of our mineral deposits are associated with igneous intrusions, and unknown-outcropping deposits are thought to be a thing of the past. If, by studying these processes, we could understand why some igneous masses are barren, while others of similar composition carry economic mineral deposits, geological prospecting for hidden mineral concentration would see a new era.
The Livingston Formation Of The South Boulder Area, Nelson A. Jones
The Livingston Formation Of The South Boulder Area, Nelson A. Jones
Bachelors Theses and Reports, 1928 - 1970
The Livingston formation is a thick succession of late Cretaceous lava flows, tuffs, and bedded water-laid volcanic detritus 200 miles long and 100 miles wide lying along the eastern margin of the Rocky Mountains in western Montana from Augusta to Yellowstone Park. It differs markedly within short distances in lithologic character and sequences, and the total thickness may exceed one mile in some places.
Comparative Studies Of Oklahoma And Missouri Granites With Special Attention To The Heavy Minerals Of The Oklahoma Granites, Russell B. Maurer
Comparative Studies Of Oklahoma And Missouri Granites With Special Attention To The Heavy Minerals Of The Oklahoma Granites, Russell B. Maurer
Bachelors Theses and Reports, 1928 - 1970
When examined petrographically the granites of Oklahoma show a marked similarity to the granites of Southeastern Missouri. The same heavy accessory mineral suites are present in the granites of both regions and include: fluorite, zircon, apatite, titanite and epidote. This similarity was further shown by the actual correlation of the heavy mineral suites by types, these types being, based on the heavy mineral distributions of the Missouri Granites.
Benefication Of An Oxidized Lead Ore From The Franklin Mine Lewis And Clark County, Jack D. Mclenegan
Benefication Of An Oxidized Lead Ore From The Franklin Mine Lewis And Clark County, Jack D. Mclenegan
Bachelors Theses and Reports, 1928 - 1970
This thesis is concerned with the beneficiation of an oxidized lead ore. Emphasis was placed upon concentration by flotation rather than by gravity methods, although some investigation was made with the Wilfley shaking table. The concentration of lead minerals received most consideration in the problem, but wherever possible attempts were made to increase the silver and gold concentration along with the lead.
Foraminifera From The Colorado Shale Of North-Central Montana, Higbee G. Williams, David P. Wilson
Foraminifera From The Colorado Shale Of North-Central Montana, Higbee G. Williams, David P. Wilson
Bachelors Theses and Reports, 1928 - 1970
The use of foraminifera in the determination of geologic age, and in the correlation of strata, is one of the most important techniques in oil field stratigraphic studies. The petroleum industry in many regions relies on these microscopic life forms to determine the positions of oil-bearing horizons and to determine the tops of beds. In northern Montana the Colorado group of strata, a series of about 2,000 feet of dense, dark similar shales, is known to contain foraminifers.
Application Of Thermistors To Temperature Measurements In Experimental Investigations, J. F. Herrick, Earl A. Glarborg
Application Of Thermistors To Temperature Measurements In Experimental Investigations, J. F. Herrick, Earl A. Glarborg
Journal of the Minnesota Academy of Science
No abstract provided.
Geological Report Of Conrow Wood Creek Area 8 Miles N.E. Of Whitehall, Montana, Kenneth M. Judd
Geological Report Of Conrow Wood Creek Area 8 Miles N.E. Of Whitehall, Montana, Kenneth M. Judd
Bachelors Theses and Reports, 1928 - 1970
Plane table and pacing methods were used in the mapping of the individual areas, but an automobile traverse was used to tie the independent areas into a composite group that would be useful for the entire zone. All land marks, section corners, roads, fence lines, drainage, and geologic features were plotted in the field and later transferred to a master map.
Test 411: Minneapolis-Moline U-Standard, Nebraska Tractor Test Lab
Test 411: Minneapolis-Moline U-Standard, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.
Test 412 Oliver Row-Crop 66 Hc, Nebraska Tractor Test Lab
Test 412 Oliver Row-Crop 66 Hc, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.
Test 413 Oliver Standard 66, Nebraska Tractor Test Lab
Test 413 Oliver Standard 66, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.
Test 425 Oliver Row-Crop 77 Hc, Nebraska Tractor Test Lab
Test 425 Oliver Row-Crop 77 Hc, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.