KROMINCO, INC
Copyright 2008 Krominco, Inc. All rights reserved.
Chromium (Cr) is one of the modern industry's most versatile elements since it has a wide range of usage in three (3) types of industries, namely : metallurgical, chemical and refractory.
Chromium is a steel-gray metal similar to platinum in luster. Some physical constants of chromium include atomic number of 24, atomic weight of 51.996, density of 7.19 grams per cubic centimeter, melting point of 1,857' and boiling point of 2,672'C. It does not tarnish and when heated yields the green chromic oxide Cr2O3.
In considering the quality of a chromium ore, the important variables are Cr2O3 (Chromic Oxide) content, Cr : Fe (Chromium - iron) ratio, SiO2 (Silicon Dioxide) content, the content and ratio of Al2O3 (Aluminum Trioxide) and MgO (Manganese Oxide) and sometimes the minor constituents such as S (Sulfur), P (Phosphorous) and others, if they exceed a fraction of 1%.
Chromite theoretically carries 68% Cr2O3 and 32% FeO (Ferrous Oxide), but Al2O3 (Ferric Oxide), MgO, CaO (Calcium Oxide) and SiO2 may displace some Cr2O3, reducing the Cr2O3 content to as little as 40%. The industry standard specifications are maintained for metallurgical chromite described as follows :
Chemical Compounds % Composition Metallurgical Standard
(Chromite Oxide) Cr2O3 48%
Cr : Fe ratio 3.1
(Ferric Oxide) FeO depends on ratio
(Silicon Dioxide) SiO2 6%
(Sulfur) S 0.50%
(Phosphorous) P 0.20%
Products Description
....................................................................................
....................................................................................
....................................................................................
....................................................................................
