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Statistical Optimization of the Binder Mixing Ratio for Fabricating Reliable Ceramic Raschig Rings
A. Salem, Y. Beygi Khosrowshahi, S. Aghahosseini
Mineral Processing Research Center, Chemical Engineering Department, Sahand University of Technology, Tabriz, Iran
received March 20, 2011, received in revised form April 28, 2011, accepted May 31, 2011
Vol. 2, No. 3, Pages 159-168 DOI: 10.4416/JCST2011-00013
Abstract
Several types of ceramic Raschig rings have been developed for extreme chemical and waste treatment processes. The compressive strength and reliability of ceramic Raschig rings are basically affected by the mixing ratio of the materials used and the quality control of the shaping process. To optimize the above-mentioned properties, various experiments have been conducted. In the present investigation polyvinyl alcohol, carboxymethyl cellulose and Arabic gum were selected and used in an experimental design algorithm. Different amounts of binders were added to a typical kaolin under conditions similar to those found in industrial practice. Different combinations of clay and binders were prepared according to the mixture design algorithm and shaped with the extrusion technique. The test rings were sintered at 1270 ºC and characterized by determining their linear shrinkage, water absorption, porosity and compressive strength. The strength data were statistically analyzed based on the Weibull theory to mathematically describe the reliability of the rings. Regression models were calculated for correlating the above properties in order to optimize the binder mixing ratio. The suitable amounts of binders were reported and the variation in the Weibull modulus was confirmed by means of scanning electron microscopy.
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Keywords
Raschig ring, extrusion, compressive strength, reliability.
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