Study On Improving Activity Of Natural Anhydrite And Making Cementation

Natural anhydrite is rich in naturnal resources, but its structure compact, activity is very low and gelatinization property is not good. Its not used effectively ,especially, its abandonment results in environmental pollution. Starting from the views of protecting biological environments, improving economical efficiency and extending the resources of construction material industry by using non-wasted technology industry at the present and in the future to produce all kinds of construction materials by using non-wasted technology. It is the important way of anhydrite-resourced use that to produce all kinds of construction materials and products by using wasted anhydrite, so it not only protects environment, but also makes economical efficiency.The ability of anhydrite to react with water slowly to make gypsum forms the chemical basis for its use as a construction material. It can substantially improve the hydrating capability by grinding finely, adding activators and calcining. The industry application of anhydrite will become impossible only after that the hydrating velocity has been perfected. This is the key of the of the research of anhydrite modification.This text be pass to carry on calcining, grinding and joining to activators for the anhydrite, to enhence activity of anhydrite, and then determine solubility, rate of hydrate, concreting time, SEM and the X-ray etc, to make sure the performance of anhydrite. It is educed that it can obviously improve the active of anhydrite in calcining 200℃. The effect of milling is a little, with a view to the problem of energy sources and entironmental, so it ought be milled 4000cm2/g. It is a good method of change to join activators, and the good activators is sodium sulfate.Simultaneity, Studied the preparation and elementary performance of anhydrite cementation, and passed to experiment to choose the best cementation ratio. Base on cementation ratio to change the mix- mete of clinker cement, or join into activators, grit etc., studied the performance of cementation, and the problem of enduring for anhydrite and anhydrite cementation.This research will guide the utilization of anhydrite. It makes the anhydrite industry production come to realize, it solves the environmental pollution of wasted anhydrite completely, and it will produce excellent socialand economical efficiency.