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Method for synthesizing aluminum-rich spinel through low-temperature solid-phase reaction
The invention belongs to the field of refractory materials, and particularly relates to a method for synthesizing aluminum-rich spinel through a low-temperature solid-phase reaction. The method specifically comprises the following steps: firstly, mixing 80-90 parts by weight of an aluminum oxide raw material, 10-20 parts by weight of a magnesium oxide raw material, 0.5-2 part by weight of magnesium aluminate spinel micro powder and 0.5-3 part by weight of an additive, and co-grinding the materials until the particle size of the raw materials is in a range of 5-20 microns; transferring the co-ground powder into a high-temperature kiln, heating to 1000-1500 DEG C, and calcining; and finally, keeping for 3-12 hours at the calcining temperature, and implementing naturally cooling or quickly air-cooling to room temperature to obtain the aluminum-rich spinel. A low-temperature synthesis process is adopted, the aluminum-rich spinel synthesized through low-temperature calcination is fine in grain and high in lattice defect degree, and meanwhile the prepared aluminum-rich spinel powder is high in activity. The prepared aluminum-rich spinel does not contain beta aluminum oxide or impurity phases such as free magnesium oxide, and the content of aluminum oxide in the aluminum-rich spinel reaches 80-90%. When the prepared aluminum-rich spinel powder is used in a corundum spinel castable, the aluminum-rich spinel powder has the advantages of high sintering strength and strong slag penetration resistance.
本发明属于耐火材料领域，具体涉及一种低温固相反应合成富铝尖晶石的方法。该方法具体为：首先以重量份计，将80‑90份氧化铝原料、10‑20份氧化镁原料、0.5‑2份镁铝尖晶石微粉和0.5‑3份外加剂混合，共磨至所述原料的粒径在5‑20μm范围内；将共磨粉转入到高温窑炉中，升温至1000‑1500℃进行煅烧；最后在煅烧温度下保持3‑12小时，自然冷却或者快速风冷到常温，即可制得富铝尖晶石。采用低温合成工艺，经过低温煅烧合成的富铝尖晶石晶粒细小、晶格缺陷程度高，同时制得的富铝尖晶石粉体活性高。制得的富铝尖晶石不含β氧化铝，也无游离氧化镁等杂质相，富铝尖晶石中氧化铝含量达到80‑90％。将制得的富铝尖晶石粉体在刚玉尖晶石浇注料中使用时，具有烧结强度高，抗渣渗透能力强的优点。
Method for synthesizing aluminum-rich spinel through low-temperature solid-phase reaction
The invention belongs to the field of refractory materials, and particularly relates to a method for synthesizing aluminum-rich spinel through a low-temperature solid-phase reaction. The method specifically comprises the following steps: firstly, mixing 80-90 parts by weight of an aluminum oxide raw material, 10-20 parts by weight of a magnesium oxide raw material, 0.5-2 part by weight of magnesium aluminate spinel micro powder and 0.5-3 part by weight of an additive, and co-grinding the materials until the particle size of the raw materials is in a range of 5-20 microns; transferring the co-ground powder into a high-temperature kiln, heating to 1000-1500 DEG C, and calcining; and finally, keeping for 3-12 hours at the calcining temperature, and implementing naturally cooling or quickly air-cooling to room temperature to obtain the aluminum-rich spinel. A low-temperature synthesis process is adopted, the aluminum-rich spinel synthesized through low-temperature calcination is fine in grain and high in lattice defect degree, and meanwhile the prepared aluminum-rich spinel powder is high in activity. The prepared aluminum-rich spinel does not contain beta aluminum oxide or impurity phases such as free magnesium oxide, and the content of aluminum oxide in the aluminum-rich spinel reaches 80-90%. When the prepared aluminum-rich spinel powder is used in a corundum spinel castable, the aluminum-rich spinel powder has the advantages of high sintering strength and strong slag penetration resistance.
本发明属于耐火材料领域，具体涉及一种低温固相反应合成富铝尖晶石的方法。该方法具体为：首先以重量份计，将80‑90份氧化铝原料、10‑20份氧化镁原料、0.5‑2份镁铝尖晶石微粉和0.5‑3份外加剂混合，共磨至所述原料的粒径在5‑20μm范围内；将共磨粉转入到高温窑炉中，升温至1000‑1500℃进行煅烧；最后在煅烧温度下保持3‑12小时，自然冷却或者快速风冷到常温，即可制得富铝尖晶石。采用低温合成工艺，经过低温煅烧合成的富铝尖晶石晶粒细小、晶格缺陷程度高，同时制得的富铝尖晶石粉体活性高。制得的富铝尖晶石不含β氧化铝，也无游离氧化镁等杂质相，富铝尖晶石中氧化铝含量达到80‑90％。将制得的富铝尖晶石粉体在刚玉尖晶石浇注料中使用时，具有烧结强度高，抗渣渗透能力强的优点。
Method for synthesizing aluminum-rich spinel through low-temperature solid-phase reaction
一种低温固相反应合成富铝尖晶石的方法
LIU XUEXIN (author) / XIONG MINGJI (author) / LI WEN (author)
2021-01-26
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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