Comparative properties study of products of chromite sintering
 
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Instytut Chemii I Technologii Nieorganicznej Politechniki Krakowskiej
 
 
Publication date: 2006-01-01
 
 
Corresponding author
Andrzej Jarosinski   

Instytut Chemii I Technologii Nieorganicznej Politechniki Krakowskiej, 31-155 Krakow ul. Warszawska 24
 
 
Physicochem. Probl. Miner. Process. 2006;40(1):109-115
 
The aim of the work was to compare the properties of chromite sintering products derived from the industrial process of sodium chromate winning. The investigations were carried out on two kinds of products. The first sample was obtained in a modified process of sodium chromate production relying on sintering chromite ore with soda, calcium oxide, and chromium waste. The second sample was derived from the dolomitic process which is commonly used in industrial practice. The phase (microscope observations, X-ray diffraction, infrared spectrophotometry) and chemical analyses were applied. In accordance with the assumption, the main component of the obtained sinter was sodium chromate being a soluble phase. The content of this compound was from 0.175 to 0.236 kg CrO3/kg of charge. The constituents of the insoluble fraction of tested sinters were periclase (MgO), calcium oxychromite (9CaO⋅4CrO3⋅Cr2O3), chromopicotite ((Fe,Mg)(Cr,Al,Fe)2O4 and dicalcium silicate (2CaO⋅SiO2). It was found that both materials have similar phase composition but different contribution of the above mineral phases. The sinters derived from the dolomite process contained additionally brownmilleritte. The tested sinters differ in softening points. Other physicochemical properties of the sinters derived from the modified process of sodium chromate production are similar with the ones for the sinters derived from the dolomite method.
ABSTRACT
sodium chromate(VI), modified process, chromium compounds winning
eISSN:2084-4735
ISSN:1643-1049
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