High-strength silicate cement clinker and preparation method thereof

The invention relates to high-strength silicate cement clinker and a preparation method thereof. The mineral constituents of the clinker are as follows in percentage by weight: alite (50%-75% of tricalcium silicate C3S), belite (2%-25% of dicalcium silicate C2S), tricalcium aluminate (2%-10% of C3A), tetra calcium aluminoferrite (2%-8% of C4AF), calcium sulphoaluminate (2%-9% of C4A3S), free calcium oxide (0.5%-3% of f-CaO), periclase (1%-6% of f-MgO) and bassanite (0-3% of CS). 1-day stand mortar strength, 3-day stand mortar strength and 28-day standard mortar strength are respectively 25MPa-35MPa, 38MPa-45MPa and 65MPa-75MPa; the clinker has certain expansibility after being hydrated; and the hydrated sample volume porosity is 10%-12%. The preparation method of the clinker comprises the following steps of: introducing gypsum to raw materials; improving content of SO3 in the materials to form calcium sulphoaluminate; properly improving aluminum ratio in dosing to control liquid phase amount in the clinker, and reducing the content of iron in the clinker; and sintering the materials into clinker under 1400 DEG C to 1500 DEG C, cooling and thermally treating the cooled clinker, quenching after the treatment is finished, wherein the clinker with high alite content is mainly formed in the first sintering process, and the secondary formation of calcium sulphoaluminate is promoted by the thermal treatment.