关键词: 磷石膏, 碳酸钙渣, 悬浮态分解

Abstract: The calcium carbonate residue is a new chemical byproduct in the production of ammonium sulfate using phosphogypsum. Lime with high reactivity can be obtained by the process of calcium carbonate calcination. A pilot experimentation on calcium carbonate calcination was presented in this paper. The calcining devices were developed by the Powder Institute of Xi’An University of Architecture and Technology. The impacts of different calcination methods on lime were discussed. In addition，the product detection methods were suggested. The decomposition rates and activity indicators in accumulation state and suspension state were compared. The results showed that suspension calcining process had better composition rate compared to the accumulation calcination. The CaCO3 apparent decomposition rate can reach >99% and the product obtained had larger specific surface area，better porosity，and higher activity. In addition，the heat efficiency of suspension calcination was better than traditional calcination processes. Therefore，the suspension calcination process can be potentially used for large-scale industrial production.

Key words: phosphogypsum, calcium carbonate residue, suspended decomposition