Preparation of microsized hematite powder from ferrous sulfate via microwave calcination

Bing guo Liu, Yan tao Yu, Jin hui Peng, C. Srinivasakannan, Li bo Zhang, Sheng hui Guo

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The preparation of microsized hematite powder from ferrous sulfate using microwave calcination was investigated based on the TG/DTG curves. The decomposition of industrial ferrous sulfate under air atmosphere was divided into three stages, and a ferrous sulfate sample added with 15% Fe2O3 could strongly absorb microwave energy. Therefore, preparing hematite powder from ferrous sulfate using microwave calcination was feasible. Hematite was obtained under the following optimized conditions: calcination temperature, 850 °C; microwave power, 650 W; and sample amount, 40 g. The obtained hematite satisfied the first-grade quality requirements. The total ferrum value was more than 58%, and the total sulfur and phosphorus contents were less than 0.5% and 0.2%, respectively. X-ray powder diffraction and scanning electron microscopy were used to characterize the structure and morphology of microsized hematite powder. The particles were non-spherical in shape, and the average particle size distribution was 10.45 μm. This work provides new potential applications for waste ferrous sulfate.

Original languageBritish English
Pages (from-to)1720-1726
Number of pages7
JournalJournal of Central South University
Volume24
Issue number8
DOIs
StatePublished - 1 Aug 2017

Keywords

  • calcination
  • ferrous sulfate
  • heating behavior
  • hematite
  • microsize
  • microwave

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