作者：Hong PENG

作者單位：Elkem Silicon Products Development

刊名：China's Refractories

ISSN：1004-4493

出版年：2024-09-15

卷：33

期：3

起頁：15-21

止頁：

分類號：TQ175.732

語種：中文

關鍵詞：

內容簡介

Cement-free castables have attracted significant attention due to their superior thermal-mechanical properties and rapid dry-out in comparison to cement-bonded refractory castables. However, drying industrial-scale specimens can pose more challenges than lab-scale samples. In this study, the dry-out behavior and explosion resistance of microsilica-gel bonded nocement castables（NCCs） were investigated on both lab-and industrial-scale specimens, employing various drying agents. First,the fast dry-out mechanism was assessed using thermogravimetric analysis（TGA）, differential scanning calorimetry（DSC）, and scanning electron microscopy（SEM） on lab-scale small samples. Then, the drying behavior of industrial-scale large samples（300 mm×300 mm×300 mm cubes, approximately 80 kg） was studied using a unique macro-thermo-balance（macro-TGA）.The results showed that EMSIL-DRY? reduced the temperature level for maximum dewatering rate and effectively prevented explosions during heat-up, compared to other polymer fibres. The use of a specialty drying agent（EMSIL-DRY?） significantly improved the explosion resistance, as demonstrated by the production of a perfect 400 kg block fired to 850 °C at a rate of 50 °C · h-1.This research contributes to the understanding and application of cement-free castables in industrial settings.