Method for preparing general-purpose cement by chlorination roasting of aluminosilicates

A method for preparing a general-purpose cement by chlorination roasting of aluminosilicates, comprising:

• (1) roasting a mixture of the aluminosilicates and sodium chloride in a steam atmosphere followed by fume discharge to obtain a solid roasted slag, wherein main chemical components of the aluminosilicates are SiO2 and Al2O3;
• (2) quantitatively mixing the solid roasted slag with a material containing CaO and MgO followed by grinding to obtain a powder mixture, or
• grinding the solid roasted slag followed by washing, drying, and mixing with a powder material containing CaO and MgO to obtain a powder mixture;
• (3) subjecting the powder mixture to oxidative calcination at a temperature not lower than 1240° C. until a stable state with liquid phase dominated is formed, and cooling to obtain a calcined slag;
• and
• (4) mixing the calcined slag with an alkali followed by grinding to obtain the general-purpose cement in a powder form, wherein the alkali is sodium hydroxide, potassium hydroxide or a combination thereof;
• or
• grinding the calcined slag separately to obtain an active powder component of the general-purpose cement for storage, and mixing the active powder component with an aqueous solution of the alkali to produce a slurry of the general-purpose cement for use.