Chromium Ore - an overview | ScienceDirect Topics
Chromium Ore. Chromium ores are often classified based on their elemental composition and industrial use into: high-chromium (46–55% Cr2O3, Cr:Fe >2.1) used for metallurgical processes, high-iron (40–46% Cr2O3, Cr:Fe 1.5–2.1) used for chemical and metallurgical purposes, and high-aluminum (33–38% Cr2O3, 22–34% Al2O3) used widely as refractory material .Oxidation decomposition of chromite ore in molten,,04-07-2007· During decomposition, the silica in the mineral was first destroyed, followed by the chromite spinel and the activation energy of this process is 35.53 kJ/mol. In addition, the effects of reaction temperature, oxygen partial pressure, weight ratio of KOH-to-chromite ore, chromite particle size on chromium extraction, and behaviors of chromium, aluminum, and silicon were examined.Decomposition of chromite ore by oxygen in molten NaOH,,01-07-2010· Chromium is extracted from the ore in the decomposition process, accompanied by the aluminum and silicon. Fig. 15 summarizes the extraction ratio of these elements with time. It is seen that the extraction ratio of chromium and aluminum increases monotonically during the whole extraction reaction, while silicon extraction has a peak value.