Novel high-strength phosphorus magnesium silicate cement and preparation method thereof

Abstract

The invention discloses novel high-strength phosphorus magnesium silicate cement and a preparation method thereof. The novel high-strength magnesium phosphate silicate cement comprises first active magnesium oxide, second active magnesium oxide, a raw material containing active silicon dioxide, monohydrogen phosphate and basic magnesium sulfate whiskers, and the first active magnesium oxide is obtained by calcining a magnesium-containing raw material at 900-1000 DEG C; the second active magnesium oxide is obtained by mixing a magnesium-containing raw material with phosphate and calcining at 1000-1600 DEG C; according to the preparation method of the novel high-strength magnesium phosphate silicate cement provided by the invention, the low-temperature calcined magnesium oxide raw material is used, so that the production energy consumption and the production cost are reduced, and the problem of too fast cement setting caused by the low-temperature calcined raw material is solved. Meanwhile, the basic magnesium sulfate whisker is added, so that the mechanical property and the water resistance of the cement can be enhanced, and the prepared novel high-strength magnesium phosphosilicate cement has good mechanical property and water resistance.

Description

technical field [0001] The invention relates to a magnesium phosphate cement, in particular to a novel high-strength magnesium phosphosilicate cement and a preparation method thereof, belonging to the technical field of novel building materials. Background technique [0002] Magnesium phosphate cement is an air-hardening cementitious material, which is made of dead-burned magnesium oxide, dihydrogen phosphate and retarder in a certain proportion at room temperature. The reaction process is similar to that of Portland cement. The mechanical properties, compactness and acid and alkali corrosion resistance of magnesium phosphate cement hydration products are relatively high, which are close to those of ceramics, so they are also called "chemically bonded ceramics" or "ceramic cements". In the conventional preparation method of magnesium phosphate cement, the dead-burned magnesium oxide used is obtained from the secondary calcination of light-burned magnesium oxide at above 1500...

AI Technical Summary

Problems solved by technology

In the conventional preparation method of magnesium phosphate cement, the dead-burned magnesia used is obtained by secondary calcination of light-burned magnesia at a temperature above 1500°C. Due to the high energy consumption and high price of dead-burned magnesia, the large-scale promotion of magnesium phosphate cement is hindered. application

The reaction speed of magnesium phosphate cement is mainly affected by the reactivity of magnesium oxide. Because of the high reactivity of magnesium oxide calcined at low temperature, the setting and hardening time of magnesium phosphate cement is too short to be poured.