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Preparation method of refractory material for low-aluminum ultralow-porosity chlorination furnace
The preparation method comprises the following steps: by taking high-potassium low-aluminum mullite, common low-aluminum mullite and fused quartz as aggregates, 325-mesh low-aluminum raw materials and binding clay as a matrix, mixing by an edge runner mill, ageing and mechanically pressing; and after drying the green body, sintering the green body in a high-temperature kiln under an oxidizing atmosphere at the highest sintering temperature of 1380-1480 DEG C. Due to the existence of the potassium-containing liquid-phase annular belt, the surfaces of the fused quartz fine particles are continuously dissolved at high temperature, cristobalite is avoided, and overall sintering is promoted. The low-aluminum raw material in the matrix is subjected to high-temperature calcination, so that a cristobalite phase exists between mullite crystals, and the volume effect caused by high-temperature sintering phase change is effectively relieved. By introducing the special low-aluminum raw material, the content of aluminum oxide in the matrix can be reduced, the use condition in a chlorination furnace is met, meanwhile, the volume expansion effect caused by cristobalite during firing is avoided, and the overall porosity is reduced.
本发明公开了一种低铝超低气孔氯化炉用耐火材料的制备方法，以高钾低铝莫来石、普通低铝莫来石、熔融石英为骨料，325目低铝原料、结合粘土为基质，经轮碾机混合，睏料后机压成型；坯体经干燥后，在高温窑炉内氧化气氛下进行烧成，最高烧成温度为1380℃‑1480℃高温烧成。由于含钾液相环带的存在，熔融石英细颗粒表面在高温时继续溶解，避免方石英化，促进整体烧结。基质中低铝原料由于经过高温煅烧，使得方石英相存在于莫来石晶间，高温烧成相变引起的体积效应得到有效缓解。通过特制低铝原料的引入可以使得基质中氧化铝含量降低，满足氯化炉中使用条件，同时避免了烧成时方石英化引起的体积膨胀效应，降低了整体气孔率。
Preparation method of refractory material for low-aluminum ultralow-porosity chlorination furnace
The preparation method comprises the following steps: by taking high-potassium low-aluminum mullite, common low-aluminum mullite and fused quartz as aggregates, 325-mesh low-aluminum raw materials and binding clay as a matrix, mixing by an edge runner mill, ageing and mechanically pressing; and after drying the green body, sintering the green body in a high-temperature kiln under an oxidizing atmosphere at the highest sintering temperature of 1380-1480 DEG C. Due to the existence of the potassium-containing liquid-phase annular belt, the surfaces of the fused quartz fine particles are continuously dissolved at high temperature, cristobalite is avoided, and overall sintering is promoted. The low-aluminum raw material in the matrix is subjected to high-temperature calcination, so that a cristobalite phase exists between mullite crystals, and the volume effect caused by high-temperature sintering phase change is effectively relieved. By introducing the special low-aluminum raw material, the content of aluminum oxide in the matrix can be reduced, the use condition in a chlorination furnace is met, meanwhile, the volume expansion effect caused by cristobalite during firing is avoided, and the overall porosity is reduced.
本发明公开了一种低铝超低气孔氯化炉用耐火材料的制备方法，以高钾低铝莫来石、普通低铝莫来石、熔融石英为骨料，325目低铝原料、结合粘土为基质，经轮碾机混合，睏料后机压成型；坯体经干燥后，在高温窑炉内氧化气氛下进行烧成，最高烧成温度为1380℃‑1480℃高温烧成。由于含钾液相环带的存在，熔融石英细颗粒表面在高温时继续溶解，避免方石英化，促进整体烧结。基质中低铝原料由于经过高温煅烧，使得方石英相存在于莫来石晶间，高温烧成相变引起的体积效应得到有效缓解。通过特制低铝原料的引入可以使得基质中氧化铝含量降低，满足氯化炉中使用条件，同时避免了烧成时方石英化引起的体积膨胀效应，降低了整体气孔率。
Preparation method of refractory material for low-aluminum ultralow-porosity chlorination furnace
一种低铝超低气孔氯化炉用耐火材料的制备方法
FAN MUXU (Autor:in) / TAN QINGHUA (Autor:in) / FENG ZHIYUAN (Autor:in) / WANG HAN (Autor:in) / WU HAOTIAN (Autor:in) / ZHANG TAO (Autor:in) / SHI PENGKUN (Autor:in) / WANG QI (Autor:in) / LI SENYIN (Autor:in)
13.06.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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