Geopolymeric cement is a new kind of cementitious material activated by some chemical activator. Preparing technique, raw materials,hydration and hardened mechanism completely differ from those of Portland cement. Its properties and applications are also much superior to Portland cement. Geopolymeric cement is thought to have great potentiality to replace Portland cement in some engineering fields. According to the results of wide researches and tests abroad, the factors that affect the preparing of the geopolymeric cement were investigated by laboratory experiments. 

This paper is on the Simultaneous determination of carbon and sulfur in coal samples using high－frequency infrared absorption method. Samples are pretreated mechanically and melted in complex slagging medium. Thus,sputtering caused by the oxygen stream blasting from the top is avoided.The measuring rang for carbon(0.001％～5％) and sulfur(0.001％～80％)can be made by this method. The recovery ranks from 93.91％～103.65％, and RSD rangs from 0.83 ％ ～ 1.70％.

In this paper, the fault diagnosis of cement mill transmission system is fulfilled by means of vibration test, which is characterized by the integrated application of amplitude domain analysis, time domain analysis and frequency domain analysis. The test results turn out to be consistent with the practical situation and the shutdown time is shortened. This analytical method can be used for reference in the vibration test of large rotary mechanism of similar size.