萝北某石墨采选固废制备发泡陶瓷试验研究

Study on the Preparation of Foamed Ceramics from Solid Waste of Graphite Mining and Beneficiation in Luobei

对萝北某采矿废石和选矿尾矿等石墨采选固废进行物化性能分析和发泡陶瓷的制备试验研究。结果表明,石墨采选固废具有与发泡陶瓷原料相似的化学成分,是一种较好的发泡陶瓷原料;以选矿尾矿为主要原料,加入少量采矿废石,同时配入一定量的高岭土和长石,可以获得适用于制备发泡陶瓷的原料;当选矿尾矿、采矿废石、高岭土与长石质量比为65∶15∶15∶5时,发泡陶瓷的表观密度为536 kg/m3,抗压强度为7.12 MPa,导热系数为0.32 W/(m·K),可以达到T/CBCSA 12-2019《发泡陶瓷隔墙板》中500密度标号的指标要求;同时,加入滑石可以拓宽发泡陶瓷的烧成温度范围,进一步改善材料的综合性能。

The physical and chemical properties analysis and preparation test research of foamed ceramics were carried out on graphite mining waste rock and beneficiation tailings in Luobei.The results show that graphite mining and beneficiation solid wastes had a similar chemical composition to that of foamed ceramic raw materials,and were proper foamed ceramic raw materials.Suitable raw materials for preparing foamed ceramics could be obtained by using beneficiation tailings as the main raw materials,adding a small amount of mining waste rock,mixed with a certain amount of kaolin and feldspar.When the mass ratio of beneficiation tailings,mining waste rock,kaolin and feldspar was 65∶15∶15∶5,the apparent density of the foamed ceramic was 536 kg/m3,the compressive strength was 7.12 MPa,and the thermal conductivity was 0.32 W/(m·K),which could meet the index requirements of 500 density label in T/CBCSA 12-2019"Foam Ceramic Partition Wall Panel".At the same time,the addition of talc could broaden the firing temperature range of foamed ceramics and further improved the comprehensive performance of the material.