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Tuesday, May 19, 2020 | History

2 edition of Factors influencing the formation of chromite seams. found in the catalog.

Factors influencing the formation of chromite seams.

Barbara Winifred Murck

Factors influencing the formation of chromite seams.

by Barbara Winifred Murck

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Published .
Written in English


The Physical Object
Pagination[141] leaves
Number of Pages141
ID Numbers
Open LibraryOL16342286M

Operation Chromite was over: Mission accomplished. Two decisive and interrelated factors shaped the operation’s outcome. The first was MacArthur’s faith, persistence and talent in selling the concept, not only to Washington but also to the doubters within his own : Historynet Staff. 1 1 Revision 4 2 3 Precipitation and dissolution of chromite by hydrothermal solutions in the 4 Oman ophiolite: new behavior of Cr and chromite 5 Shoji Arai1,* and Norikatsu Akizawa1 6 1Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa , Japan. 7 *e-mail: [email protected] 8 Abstract 9 Chromite is a typical refractory igneous mineral, .

The reaction between these gases and the solid chromite grains results in the reduction of the chromite and allows for the formation of iron and chromium alloys. There could also be a formation of metal carbides from the interaction with chromite and the gases. Chromite is seen to form early in the crystallization ry: Oxide minerals, Spinel group, Spinel . Chromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1, °C (3, °F) and boils at 2, °C (4, °F). In the pure state it is resistant to ordinary corrosion, resulting in its application as an electroplated.

Chromitite is an igneous cumulate rock composed mostly of the mineral is found in layered intrusions such as the Bushveld Igneous Complex in South Africa, the Stillwater igneous complex in Montana and the Ring of Fire discovery in Ontario.. Chromitite typically forms as orthocumulate layered lenses in peridotite rocks, at times intergrown with other oxides such as magnetite and. What is Chromite? Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4).It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or weathering.


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Factors influencing the formation of chromite seams by Barbara Winifred Murck Download PDF EPUB FB2

This paper explores the hypothesis that chromite seams in the Stillwater Complex formed in response to periodic increases in total pressure in the chamber. Total pressure increased because of the positive δV of nucleation of CO2 bubbles in the melt and their subsequent rise through the magma chamber, during which the bubbles increased in volume by a factor of 4– by: Pressure increases, the formation of chromite seams, and the development of the ultramafic series in the Stillwater Complex, Montana.

This paper explores the hypothesis that chromate seams in the Stillwater Complex formed in response to periodic increases in total pressure in the chamber.

Factors Affecting the Reducibility of Sintered Chromite Pellets and Chromite Lumpy Ore 77 carbon addition on the porosity was % points /4/.

An addition of wood dust or dolomite increased the sof-tening point of the sintered pellet. When simultaneously. in chromite- or orthopyro xene-rich layers, whereas pressure decreases could result in anorthosit ic or dunite formation. The attraction of t his model is that pressure change s could. chromite refractories.

Economic Factors Production of chromite ore on a world scale is essentially driven by demand in the ferrochrome industry, and is a major factor influencing demand in the chemical, refractory, and pigment markets.

Strong demand for ferrochrome for use in stainless steel manufacture is currently putting pressure on the. The Upper Jurassic-Lower Cretaceous Mist Mountain Formation in the southeastern Canadian Cordillera is a nonmarine succession up to m thick that includes as many as 15 major seams of high volatile bituminous to semi-anthracite coal.

Coals at the base of the formation were deposited in coastal and delta plain environments, whereas those of the upper part are interpreted as upper delta. chromite grains from the G chromitite seam of the Stillwater Com-plex, Montana, United States. These inclusions are interpreted to represent melt trapped during chromite growth and hence provide information on chromitite formation.

Most reheated inclusions have variable quench textures and chemical compositions that are. melting behaviour of chromite ores are the important factors affecting the chromium yield, and more and more attention is therefore being paid to investigations of the characteristics ofchromite ores.

A number of papers on chromium reduction have been published in recent yearsI There are two main viewpoints on the reduction mechanism.

One. A new descriptive stratiform chromite deposit model was prepared which will provide a framework for understanding the characteristics of stratiform chromite deposits worldwide. Previous stratiform chromite deposit models developed by the U.S. Geological Survey (USGS) have been referred to as Bushveld chromium, because the Bushveld Complex in.

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Chromite belongs to the spinel group with the general chemical formula XY 2 O 4, where X and Y represent divalent and trivalent metal ions, respectively. Four types of chromite ore deposits occur as either lode or secondary deposits. Lode chromite ore deposits comprise stratiform and podiform deposits, whereas secondary chromite ore deposits.

The chromiferous ultramafic rocks of Sukinda Valley (21°0'–21°5'N°43'–86°0'E) of Orissa are intrusive into the Iron-Ore Supergroup (2,–3, Ma) at the eastern periphery of the Indian Precambrian shield.

Both laterally and vertically, chromite occurs as persistent layers, lenses or pockets in the serpentinized and silicified dunite-peridotite extending over a strike length of Cited by: Metals occur in all kinds of rocks but usually in concentrations that are too low to be mined.

Metallic ore deposits, however, are relatively rare concentrations of metal‐bearing minerals (usually sulfides) that contain enough metal to be profitablythe profit line is dependent on a number of economic factors.

On the contrary, below the bubble point pressure oil formation volume factor decreases by pressure decline. The reason is that below the bubble point pressure when the pressure drops, gas is liberated from oil, and consequently, the volume of oil in reservoir decreases.

View chapter Purchase book. The geologic formation, such as hard seams, cap rock, hard bottom, or large toes, dictate the use of high-energy explosives. Water-filled boreholes require the use of water-resistant products at a premium cost.

factors exert their influence as well. Among the factors to. Abstract. External and internal factors influencing the rate and distribution of corrosion are discussed. Among the external factors considered are: pH of the solution, influence of elements acting as inhibitors or as stimulants of corrosion, the concentration of neutral salts, the temperature of solution and the rate of solution by: 3.

The features which have remained controversial and need to be addressed are: (a) the formation of chromitite layers (in which chromite is the only cumulus phase); (b) the great lateral extent of.

The results of experimental test and theoretical analysis indicate that the formation permeability and breakdown pressure are the main factors affecting hydraulic fracturing process, and the formations with large difference in these two factors always induce an uneven distribution of fracturing fluid and poor effect of integrated hydraulic : Xianbo Su, Feng Li, Linan Su, Qian Wang.

Chromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite Series and the Chromite-Magnesiochromite is the iron analogue of Zincochromite, Cochromite, Manganochromite and Magnesiochromite and the Cr analogue of Hercynite.

Back to Rocks and Minerals Articles Kathy Feick Chromite is the main source of the metal chromium, a metal used to induce hardness, toughness and chemical resistance in steel. It was named after its chemical composition, chromium oxide. The mineral is brownish to black in colour with a dark brown streak.

It has a conchoidal or an uneven fracture as well as no distinct. Chromite is the Key to PGE F. Johan Kruger 1, Judith A. Kinnaird, Paul A.M. Nex2 and R. Grant Cawthorn2 1Economic Geology Research Institute – Hugh Allsopp Laboratory 2School of Geoscienses, University of the Witwatersrand, WITSSouth Africa.

Email: [email protected] Introduction Chromitite layers in the Bushveld Complex have long been known to host anomalous.General Chromite Information: Chemical Formula: Fe++Cr2O4: Composition: Molecular Weight = gm Chromium % Cr % Cr 2 O 3: Iron % Fe % FeO: Oxygen % O: % % = TOTAL OXIDE.Stratiform chromite deposits are expressed as massive chromitite (greater than 90 percent chromite) bodies or seams of disseminated chromite in large, unmetamorphosed, repetitively layered mafic-ultramafic intrusions that were emplaced in stable cratonic settings or during rift-related events.