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本发明是利用粉煤灰与磷酸反应生产不烧结耐火隔热砖。耐火隔热砖分为烧结和不烧结砖两种。采用烧结法的目的是确保砖组织尺寸稳定和机械强度。烧结温度通常在1000℃以上,能耗费用高。采用不烧结法,砖是用化学粘结剂粘合,硬化后于150°—300℃温度下干燥,燃料费用低。原有烧结法所用化学粘结剂有高铝水泥、磷酸二氢铝、氯化镁等。高铝水泥在常温下机械强度虽高,但加热时强度降低。磷酸二氢铝
The present invention utilizes the reaction of fly ash and phosphoric acid to produce non-sintering refractory bricks. Fire-resistant insulation bricks are divided into two types, sintered and unsintered bricks. The purpose of the sintering method is to ensure that the brick structure is dimensionally stable and mechanically strong. The sintering temperature is usually above 1000°C and the energy cost is high. Using non-sintering method, bricks are bonded with a chemical binder and dried at a temperature of 150°-300°C after curing, resulting in low fuel costs. The chemical binders used in the original sintering method include high-alumina cement, aluminum dihydrogen phosphate, and magnesium chloride. High alumina cement has high mechanical strength at room temperature, but its strength decreases when heated. Aluminum dihydrogen phosphate