利用太湖竺山湾底泥制备轻质陶粒试验研究

Research on Preparation of Lightweight Haydite by Using Sediment from Zhushan Bay of Taihu Lake

以太湖竺山湾底泥为研究对象,通过对其主要成分、矿物组成和热性质分析,考察其烧制轻质陶粒的可行性;以膨胀率和表观密度为指标,对烧结温度和烧结时间进行单因素试验,确定较佳的纯底泥烧制轻质陶粒工艺参数,并对所制陶粒微观结构和重金属浸出毒性进行分析。结果表明,竺山湾底泥成分基本满足烧制轻质陶粒要求,在不添加其他任何添加剂的情况下,其较佳的烧制条件为1 110~1 120℃下焙烧5~10 min冷却至室温,可以得到表观密度为0.8~0.9 gcm3,具有较好强度的膨胀轻质陶粒。底泥在烧制陶粒过程中重金属得到很好地固化,陶粒中重金属浸出率很低。

The main components, mineral composition and thermal property of the sediment from Zhushan Bay of Taihu Lake were analyzed, and the feasibility of producing lightweight haydite by the sediment was investigated. The optimal production parameters were determined through using expansion rate and apparent density as assessment heavy metals were analyzed by SEM and ICP-AES. The single factor test of different time and temperature by indicators. The microstructure and the leaching toxicity of results showed that the main components of the sediment met the requirements of lightweight haydite basically. At the sintering temperature of 1 110-1 120 ℃ for 5-10 min and then cooling to ambient temperature, the lightweight haydite with good strength and apparent density of 0.8-0.9 g/cm3 could be produced without any other additive. During the process, not only was the solidification of heavy metal satisfactory but the leaching toxicity of heavy metal was very low.