Abstract: In this paper，the calcination processes of oyster shell is studied through the temperature-programmed pyrolysis technology. The changes of physical and chemical properties of oyster shell before and after calcination were investigated by X-ray diffraction (XRD)，scanning electron microscopy (SEM)，Fourier transform infrared spectroscopy (FTIR)，energy dispersive spectroscopy (EDS)，and thermogravimetry (TG). At the peak temperature of 756.2℃，oyster shell thermal maximum weight loss rate was 5.24% min?1. It was caused by calcium carbonate decomposition calcite type. After calcination at 800℃，oyster shell was decomposed to CaO. Due to the complexity of oyster shells physical structure，CaO generated Ca(OH)2 by absorbing water. The calcined process of oyster shell at high temperature has the obvious enrichment effect on Si.

Key words: oyster shell, biomass, calcined, pyrolysis, phase change

摘要： 采用程序升温热解技术研究牡蛎壳煅制过程。通过运用X 射线衍射（XRD）、扫描电子显微镜（SEM）、红外光谱（FTIR）、能谱仪（EDS）和热重（TG）等表征技术手段，分析研究高温煅制前后牡蛎壳的物理化学特性变化规律。研究表明，在445℃附近牡蛎壳中的碳酸钙由文石型相转变方解石型，756.2℃处最大热失重速率为5.24%min?1，是方解石型碳酸钙分解所致。800℃高温煅烧后碳酸盐分解产生的CaO具有较强的吸水能力生成Ca(OH)2，高温煅制过程对牡蛎壳中Si有明显的富集作用。

关键词: 牡蛎壳, 生物质, 煅制, 热解, 相变