Pilot Tests for the Comprehensive Utilization of Coal Refuse to Produce Alumina and Cement Clinker

Abstract:

This paper describes a pilot process for the comprehensive utilization of coal refuse. During the process, alumina was first extracted from coal refuse, the residue was then used to calcine cement clinker, and all of the waste gases and water were recovered and re-used in the process of alumina extraction. During the first process, the appropriate temperature regimen and temperature distribution were determined based on laboratory results in a tunnel kiln, and were optimized during the pilot process. The most important step of the temperature regimen is the increasing rate within the temperature range of 500–600°C. And the last determined temperature regimen is suitable to be used in the other industrial kiln when the other processes are applied for the extraction of alumina from coal refuse. The extraction rate for alumina has also been investigated in the pilot tests, and it is a bit lower than those obtained in the laboratory tests. Two methods were used for the calcination of cement clinker. The clinker calcined directly from the adjusted residue could be used for applications with low strength demands, whereas the clinker calcined from the residue and the raw materials of the Portland cement clinker could be used normally.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 854-859
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.854
• Online since: July 2012
• Authors: Qiu Guo Xiao, Shao Bin Xiang, Shao Hua Shen
• Keywords: Alumina, Cement Clinker, Closed Cleaning Process, Coal Refuse

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