Investigation on Mechanics of Synthesizing Silicon Carbide from Siliceous Waste
He Enguang¹, Wang Xiaogang², Chen Shoutian¹
(1. Xi'an Jiaotong University, Xi'an 710049, China; 2. Xi'an University of Science & Technology)

Abstract: Silicon carbide was synthesized from siliceous waste and weakly caking coal by using Acheson process. Micro-structure of siliceous waste was investigated. scan electron microscope (SEM) shows that globular silicon dioxide is contained in organic material thin-layer. Globular silicon dioxide diameter is less than 10¦Ìm and organic material thin-layer thickness is less than 5¦Ìm. Reaction procedure model was presented on the basis of SEM study. Synthetic reaction of silicon carbide of micro-structure of siliceous waste is quickly and thoroughtly conducted under the condition of lower temperature. Experiment indicated that siliceous waste is the perfect natural raw material of industrial silicon carbide synthesized by using Acheson process. Substituting siliceous waste for quartzite and petroleum coke or anthracite which are more expensive, short of resources and high volatilizing of surphur, it is possibly to change waste material into useful one and to control pollution, also to save energy and to reduce production cost.
Keywords: Acheson process;silicon carbide;siliceous waste;reaction mechanism