The Study of the Formation of Sodium Chromate from El-Baramiya High-Silica Chromite Ore Concentrate Using Hydrated Lime

Authors

  • F.M.S. El-Dars Chemistry Department, Faculty of Science, Helwan University, Helwan, Egypt
  • M.E.H. Shalabi Central Metallurgy Research and Development Institute, Cairo Egypt
  • H.A.M. Abuzeid National Research Center, Cairo, Egypt
  • M.G. Khalifa El-Tabbin Metallurgical Institute, Cairo, Egypt
  • A.B. Farag Chemistry Department, Faculty of Science, Helwan University, Helwan, Egypt

DOI:

https://doi.org/10.18321/ectj260

Abstract

The formation of sodium chromate from a mixture of high-silica chromite ore concentrate (48.8%), soda ash and hydrated lime was investigated. Hydrated lime was added to an optimal mixture of Cr2O3:Na2CO3 (mole ratio 1:2.5) (mole ratio of CaO 0-3) and the materials were roasted at 1000°C for 60 min and PO2 0.21 atm. Results revealed a significant decrease in sodium chromate yield (from 42% to 25%) as the (CaO/Cr2O3) mole ratio increased from 0-0.5. Increasing the (CaO/Cr2O3) mole ratio above 1.0, an optimal chromate yield of 70% was achieved at the mole ratio of 2.5. In addition, roasting of optimal mixtures of soda ash, chromite ore and hydrated lime (CaO) (mole ratio 2.5:1:2.5) within the temperature range of (900-1000 °C) provided a maximum chromate yield of 92% at 1000 °C after 2 hours. Overall, the data revealed that while the hydrated lime addition significantly increased the reaction product yield, it also increased the process energy of activation from 112 kJ/mole for the Na2CO3:Cr2O3 (mole ratio 2.5:1) mixture to 171.6 kJ/mole during roasting time (40-100 minutes).

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Published

2007-03-20

How to Cite

El-Dars, F., Shalabi, M., Abuzeid, H., Khalifa, M., & Farag, A. (2007). The Study of the Formation of Sodium Chromate from El-Baramiya High-Silica Chromite Ore Concentrate Using Hydrated Lime. Eurasian Chemico-Technological Journal, 9(2), 97–103. https://doi.org/10.18321/ectj260

Issue

Vol. 9 No. 2 (2007)

Section

Articles

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