Using by pozzolan material and domestic abrasive material as composite material in casting process of rice polishing cylinder

Abstract

The objective of this research was to apply pozzolan material as a binder replacement with the original binder
material and use domestic abrasive material as composite material in the casting process of rice polishing
cylinders. In the present, the original binder was imported as calcined magnesite cement that cost an average of 50 million baht per year. This research has selected pozzolan materials which consist of rice husk
ash, bagasse ash, and metakaolin to use in the experiment and substitute Calcined Magnesite Cement by
60% using design of experimental with licensed Minitab Release 14. According to the mixture design function
which has 10 formulations for compressive strength and tensile strength testing, it found that the optimal
formular was rice husk ash : bagasse ash : metakaolin equal to 15: 25 : 60. When used this formular to cast
the cylinder and test rice milling, it found that average broken rice percent was reduced to 16.41 and the
average wear rate was 3.91 g/hr. While the rice polishing cylinder which used all abroad composite material
has average broken rice percent equal to 23.98 and average wear rate equal to 7.02 g/hr. So, the using
composite material from pozzolan materials and domestic abrasive material can improve the efficiency of rice
milling and quality of rice polishing cylinder.