Preparation of Advanced Materials by Hydrothermal Hot-pressing from Waste Shells

养殖珍珠后的珍珠母贝、牡蛎壳、扇贝壳等废弃贝类难以进入处理过程，因此废弃贝壳被用作无任何价值的水泥制造零件材料。本研究的目的是试图关注水热条件下的固化反应，在阐明固化反应过程的同时，将这些未使用的天然碳酸钙粉末固化，制成坚固的板材成型体，并从建筑材料等的应用研究中获得新的建立的基础信息。当无机化合物与水混合时，在300℃以下的高温高压溶液体系中进行机械加压，研究人员发现，在烧结坯的同时，也发生了硬化反应。在这里，通过使用各种贝壳粉末的水热硬化反应来制造先进的成型体，并承担未使用的废物的升级回收的帮助。在生物材料方面，通过碳酸钙粉末和磷酸根离子溶液的水热反应，可以作为生物体材料的展开物，制备羟基磷灰石。通过水热条件的选择，可以制备出致密或多孔的材料，部分样品经模拟体液检测和细胞培养检测显示出良好的效果。认为这种在300℃以下温度下获得羟基磷灰石材料的方法比目前使用900℃等高温加热的方法更好，并且在能源成本和环境方面能够成为未来的有力手段。

It is difficult for waste shellfishes such as pearl oyster shells after pearl culture, oyster shells and scallop shells to be carried into disposal process, therefore waste shells are used a part material without any values for the cement manufacturing. The purpose of this research tries to pay attention to the stiffiening reaction under the hydrothermal condition, to solidify these unused natural calcium carbonate powders, and makes to a strong board molding body at the same time as clarifying the process of the solidification reaction, and to obtain basic information for new establishment from the applied research to the building material etc.When inorganic compounds were mixed with water and pressurized mechanically in the high temperature high-pressure solution system at the temperature below 300℃, the research representatives found the stiffening reaction being caused as well as the sintered compact. Here, it was done to make an advanced molding body by using the hydrothermal stiffening reactions of various shell powders, and to assume a help of the upgrade recycling of unused waste. Especially, preparation of advanced materials with high functions by addition of organic matters was researched.In the case of biomaterials, hydoxyapatite was able to be prepared as development with the living body material by hydrothermal reactions from calcium carbonate powders and solutions with phosphate ions. The dense compact or the porous material could be prepared by the selection of hydrothermal conditions, and a part of samples showed an excellent result by the simulated body fluid examination and the cell culture examination. It was thought that this method of obtaining hydroxypatite materials at the temperature below 300℃ is better in comparison with the current method using high temperature heating such as 900℃ and was able to become a powerful means in the future in the energy cost and the environment.