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After a description of the comminution process wet and dry milling methods , it discusses batching and mixing operations and granulation methods.

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The article also deals with the effect of process variables and the steps involved in chemical synthesis, including preparation from solution and gas-phase reactions, filtration and washing, and powder recovery techniques. It concludes with a discussion on characterization, centering on size distribution analysis, specific surface area, density, porosity chemical composition, phase, and surface composition.

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1. Introduction

User Tools. Sign In. Close mobile search navigation. ASM Desk Editions. Edited by. Michelle M. Gauthier Michelle M. The chromite minerals occur in layered formations that can be hundreds of kilometres long and a few meters thick. The structure of the ore can be seen as platy, with breakages along planes of weakness.

Chromite can also be presented in a thin section. The grains seen in thin sections are disseminated with crystals that are euhedral to subhedral. Chromite is a part of the spinel group , which means that it is able to form a complete solid solution series with other members in the same group. Chenmingite and xieite are polymorphs of chromite while magnesiochromite and magnetite are isostructural with chromite.


Chromite occurs as massive and granular crystals and very rarely as octahedral crystals. Grains of minerals are generally small in size. These grains are seen to crystallize from the liquid of a meteorite body where there are low amounts of chromium and oxygen.


The large grains are associated with stable supersaturated conditions seen from the meteorite body. Chromite is an important mineral in helping to determine the conditions that rocks form. It can have reactions with various gases such as CO and CO 2. 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 process. This allows for chromite to be resistant to the alteration effects of high temperatures and pressures seen in the metamorphic series.

  • Materials Science Research.
  • Extrusion in Ceramics (Engineering Materials and Processes).
  • Description:?
  • It is able to progress through the metamorphic series unaltered. Other minerals with a lower resistance are seen to alter in this series to minerals such as serpentine , biotite and garnet. Chromite is found as orthocumulate lenses of chromitite in peridotite from the Earth's mantle. It also occurs in layered ultramafic intrusive rocks.

    Extrusion in Ceramics (Engineering Materials and Processes)

    Ore deposits of chromite form as early magmatic differentiates. It is commonly associated with olivine , magnetite , serpentine , and corundum. Chromite is found in large quantities that is available for commercial mining. The chromite minerals are found in 2 main deposits, which are stratiform deposits and podiform deposits. Stratiform deposits in layered intrusions are the main source of chromite resources and are seen in countries such as South Africa , Canada , Finland , and Madagascar.

    Chromite resources from podiform deposits are mainly found in Kazakhstan , Turkey , and Albania. Zimbabwe is the only country that can obtain chromite resources from both stratiform and podiform deposits. Stratiform deposits are formed as large sheet-like bodies, usually formed in layered mafic to ultramafic igneous complexes. Stratiform deposits are typically seen to be of Precambrian in age and are found in cratons. The mafic to ultramafic igneous provinces that these deposits are formed in were likely intruded into continental crust , which may have contained granites or gneisses.

    The shapes of these intrusions are described as tabular or funnel-shaped. The tabular intrusions were placed in the form of sills with the layering of these intrusions being parallel. The funnel-shaped intrusions are seen to be dipping towards the center of the intrusion. This gives the layers in this intrusion a syncline formation. Chromite can be seen in stratiform deposits as multiple layers which consist of chromitite. An indication of water in the magma is determined by the presence of brown mica.

    Application of Refractories

    Podiform deposits are seen to occur within the ophiolite sequences. The stratigraphy of the ophiolite sequence is deep-ocean sediments, pillow lavas , sheeted dykes , gabbros and ultramafic tectonites. These deposits are found in ultramafic rocks, most notably in tectonites. Messing, A. Selcuker, R. Arsentjeva, M. Back Matter Pages This conference was also the twentieth Conference on Ceramic Sciences organized yearly by a "confederation" of four institutions: North Carolina University at Raleigh, N.

    It seems that the analysis of the two particle models is finally extended to the analysis of the models of compacts. Also, the effects of atmosphere on the sintering of ceramics after a long period of neglect, seem to attract the attention of more workers in the field. Chemical reaction X-ray atmosphere catalysis ceramic ceramics grain iron metals paper.

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