Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 52 for “"chromite"”.
-
Investigation of the flotation of chromite, An
Includes bibliographical references (pages 31-32).
-
Dehydrogenation of N-Propanol to Propionaldehyde over a copper chromite catalyst
… propionaldehyde production. A commercial copper-chromite catalyst (G-13), for the dehydrogenation of ethanol to acetaldehyde, was used for the purposes of this study.
-
Dispersion behavior of aluminum oxide, lanthanum manganite and lanthanum chromite powders in liquids
… dispersion of lanthanum manganite and lanthanum chromite powders in nonaqueous solvents"--Abstract, page iii.</p>
-
The characterisation of a two stage flotation circuit treating a complex platinum and chromite ore
… in terms of platinum, palladium, rhodium and chromite recoveries was determined by sampling around the unit. The changes in ore floatability characteristics were monitored by carrying out batch flotation tests on samples taken from the feed to each unit. The mixing in the units was …
-
The rate and activation energy of the first order dehydration of 2-butanol over a copper chromite catalyst
Call number: LD2668 .T4 1957 C35
-
The rate and activation energy of the first order dehydration of 2-butanol over a copper chromite catalyst
Call number: LD2668 .T4 1957 C35
-
Determining the differences in effect of chromate, chromite and chromium picolinate in rainbow trout (Oncorhynchus mykiss) at environmentally relevant concentrations
… northern Ontario that houses a rich deposit of chromite and is slated for mining development. The goals of this study were to better understand the relative effects of Cr6+ to Cr3+ in rainbow trout, identify potential protein biomarkers to distinguish between Cr6+ and Cr3+ exposure, and …
-
Solar receiver coating development: the synthesis and growth of copper chromite spinel particles across sol-gel routes and calcination profiles
CuCr2O4 is a promising spectrally selective material for solar receiver coatings to improve solar efficiency. Key requirements of such a coating are its high absorptivity, robustness, and ability to prevent high temperature oxidation of the substrate. This work describes synthesis routes for the …
-
Platinum-group elements in the ultrabasic rocks of the Braganca and Morais massifs, northern Portugal
… crystallised within small magmatic masses. This chromite crystallisation acted to fractionate the associated Platinum-Group Element (PGE) assemblage. Os, Ir and Ru were incorporated as laurite and irarsite minerals during chromite grain crystallisation, and are located in textural positions from …
-
Study of effect of process parameters and their interaction in the flotation of UG2 ore
… task. UG2 ore contains significant amounts of chromite which is hydrophilic in nature and reports to the concentrate by means of mechanical entrainment. This is a serious problem for the downstream smelting process, which generally has a constraint of 3 chromite. In order to optimise PGM and …
-
ΚΑΤΑΝΟΜΗ ΤΩΝ ΣΤΟΙΧΕΙΩΝ ΤΗΣ ΟΜΑΔΑΣ ΤΟΥ ΛΕΥΚΟΧΡΥΣΟΥ (PGE) ΚΑΙ ΤΟΥ ΧΡΥΣΟΥ ΣΕ ΧΡΩΜΙΤΙΚΑ ΜΕΤΑΛΛΕΥΜΑΤΑ ΚΑΙ ΠΕΤΡΩΜΑΤΑ ΤΟΥ ΟΦΙΟΛΙΘΙΚΟΥ ΣΥΜΠΛΕΓΜΑΤΟ...
… A SIGNIFICANT VARIATION IN THE COMPOSITION OF CHROMITE ORES AND HOST ROCKS,WHICH WAS CONSIDERED BY PREVIOUS AUTHORS TO BE VERY RESTRICTED. CHROMITE AND HOST ROCK GEOCHEMISTRY STUDY THROUGHOUT THE VOURINOS OPHIOLITE COMPLEX LED TO THE DISTINCTION OF THREE DIFFERENT GEOTECTONIC UNITS, …
-
Platinum-group element mineralisation in the Shetland ophiolite complex
… Two stratigraphically controlled zones of chromite enrichment have been identified which mark the bases of cyclic repetitions. Such chromite enrichments lack progressive changes in mineral chemistry so repetitions within the cumulate sequence are attributed to influxes of primitive magma …
-
Developing a framework for the design of the milling and rougher circuits for a platinum-bearing UG2 ore
… Bushveld Igneous Complex, which results in high chromite content. Chromite causes significant complications in the downstream smelter process, and therefore chromite constraints are imposed on UG2 concentrators. A further aspect complicating the treatment of UG2 ore is that PGM’s are not only …
-
Optimisation of an industrial scale ball mill using an online pulp and ball load sensor
… rich fraction in the IsaMill and the coarser chromite rich fraction through the ball mill. This circuit is typical of a UG2 plant in which maximum silicate with minimal chromite breakage is targeted. As a result of the circuit change an opportunity for optimisation around the industrial scale …
-
The discovery of baddeleyite (ZrO2) and chrome spinel in the basal Rooiberg Group of the 2.057 Ga Bushveld Complex, South Africa: Implications for the impact and igneous scenarios for the petrogenesis of the Rooiberg Group.
… of composite zircon-baddeleyite grains and chromite in the Basal Rhyolite demands a reassessment of proposed scenarios for its petrogenesis. These scenarios include: 1) crustal melting caused by, and differentiation of, intrusive ultramafic magmas of the 9 km thick Rustenberg Layered Suite …
-
The low-temperature sintering behavior of (La,Ca)CrO₃
<p>"Calcium doped lanthanum chromite has suitable properties for use as a solid oxide fuel cell interconnect, but it is difficult to sinter. The purpose of this study was to develop methods of sintering this material in air at temperatures below 1500°C. The results are compiled into three …
-
Investigation of the surface properties of gangue minerals in PGM bearing ores
… normally considered to be hydrophilic, such as chromite and pyroxene, report to the concentrate as floatable particles. Polysaccharide depressants, such as carboxymethyl cellulose (CMC) and modified guar gums are used to reduce the floatability of naturally floatable gangue and may also be able …
-
Investigating the effect of frother type on froth structure, froth recovery and entrainment
… recovered. Upper Group 2 (UG2) ore contains chromite minerals which are naturally hydrophilic. The chromite minerals are usually recovered in the concentrate mainly due to entrainment. This lowers the grade of valuable minerals recovered and poses detrimental effects to downstream operations. …
Page 1 of 3