CEMENT EXPANSION AGENT Russian patent published in 2009 - IPC C04B7/00 C04B22/00 

FIELD: chemistry.

SUBSTANCE: invention refers to the composition of cement expansion agent and can be used in the industry of constructions materials and in petroleum industry for production of high-performance binders and grouting mortars. The cement expansion agent containing the dross of secondary aluminium reprocessing contains the said dross with following composition (wt %): Al₂O₃ 65-70, AlN₃ 10-15, Al 1-5, NaCl-KCl 10-23. The said dross is modified with organic acid includes particle size less than 100 mcm and taken in amount 0.1-1 wt % in relation to the total weight; the acid is applied by its spraying to the dross with following drying in the drying chamber with hot air having temperature not more than 50°C.

EFFECT: increasing of enhancing degree of the cement stone on retention of rheological properties and setting time of grouting mortars.

1 ex