Physicochemical patterns of complex reduction multicomponent charge have been studied in the absence liquid phases order to obtain spongy ligatures. The contained both simple oxides and oxide compounds. was conducted being realized at expense carbon gases (CO H2) as well with participation carbide phase, which formed during process. dependence phase composition products on initial ratios O/(C+H...

The ores of chromite, nickel, copper, and zinc show a wide distribution over geologic time, but those of iron, titanium, lead, uranium, gold, silver, molybdenum, tungsten, and tin are more restricted. Many of the limitations to specific time intervals are probably imposed by the evolving tectonic history of Earth interacting with the effects of the biomass on the evolution of the earth's s surf...

Cosmic-ray exposure ages of 480 million year old fossil meteorites found in Southern Sweden constrain delivery times of meteorites from a large collision in the asteroid belt. Chromite grains from seven meteorites from four stratigraphic layers define an exposure age gradient as expected if the meteorites originated from the well-known L-chondrite parent body break-up event. The very short deli...

Abstract The Gomati and Nea Roda ophiolites are located into the Serbo-Macedonian massif of Chalkidiki peninsula (Northern Greece). present work focuses on variability platinum-group elements (PGEs), geochemistry, spinel mineral chemistry, minerals (PGMs) — base metal (BMMs) assemblage in chromitites three localities (St. George, Tripes, Limonadika) Roda. studied show variable textures heavily ...

OBJECTIVES The aims of the study were to describe the noise levels at an open cast chromite mine in Odisha, India, and the hearing threshold of its workers and to associate their hearing loss with their age, work station and length of employment at the mine. METHODS We performed a cross-sectional study of the hearing threshold of chromite mine workers. Audiometric data from 500 subjects was c...

Examination of published procedures for the decomposition and subsequent analysis of chromite and chrome ores shows some to be unnecessarily complicated and time consuming. Others fail to yield consistent and reproducible results. Decomposition is rapidly and effectively accomplished using the peroxide frit technique of Rafter. Chromium may then be removed and determined volumetrically allowing...