| 摘要 |
The present invention is related to the process and composition for the manufacture of cement expansion additive. The process comprises a blending step, a reaction step, and a calcination step. The blending step is to incorporate soluble calcium sulfate, soluble calcium oxide, and soluble aluminum compounds such as aluminum dross. The addition of water with the above incorporated materials to from ettringite is so-called reaction step. The calcination step is to calcine the products which are produced from reaction step at a temperature range between 60° C. and 900° C. by transforming ettringite from amorphous to calcium sulfoaluminate respectively. After calcinations, the final products can be used as expansive additives for cement or concrete. Further, this manufacturing method can effectively decrease raw material cost and production cost due to the raw material coming from recycling and no need to calcine at high temperature than other relative arts.
|
