Study on preparation of alite-sulphoaluminate cements by utilizing coal gangue

摘要

Coal gangue is a kind of solid waste which is discharged by coal mining and coal washing. Dumped gangue does not only take lots of occupation of land but also pollute air and water. Treatment and utilizing of coal gangues is conducive to regional economic development and environment protection. Alite-Sulphoaluminate cement can be made at 1330oC in using coal gangue, limestone and a little of gypsum fluorite and barite. It is proved by compressive strength tests that Alite-Sulphoaluminate cement's purified pulp is up to 45.6MPa in 3 days, 72.72MPa in 28days.