Abstract
Large amounts of powder of cement kiln dust waste are accumulating all over Egypt every year and disposal of this tailing is needed. Recycling of the waste into glassy material is one from the best ways for eliminating their hazardous impact on the people and environment. Glasses based on this tailing were prepared by conventional melt-quenching method. The composition dependence of the elastic properties of these glasses was discussed in association with the effects of adding CDK. The addition of CDK was expected to produce significant changes such as an increase in density, ultrasonic velocities and elastic moduli.