Continuous preparation of the mono-core coating of particle using the spouted bed with draft tube

随着新材料的不断发展，对原材料的最小化和固体颗粒表面特性的改善提出了更高的要求。如果实现了细颗粒的单芯涂层，则意味着在易处理的种子颗粒上涂覆了难以处理的有用细材料。这种情况意味着其作为功能性细颗粒的应用范围得到了扩展，并且似乎能够有效地在这些材料中进行新功能的添加。本实验通过将具有环境清洁功能但粘结性较强的钛细颗粒涂覆在处理能力较好的Shirasu颗粒、玻璃微珠等基材上，尝试制备具有环境清洁功能的功能性细颗粒。因此，通过在尾水管顶端安装具有拒水性的特氟龙管，可以实现300分钟的连续涂布作业，更有可能由于管的堵塞而得到抑制。然后，无论PVA的聚合程度和种子颗粒的类型如何，都可以在种子颗粒表面的90%处涂覆钛细颗粒。用日光灯对所制备的亚甲基蓝进行紫外激发，证实了所制备的亚甲基蓝与光催化剂对通过的亚甲基蓝具有脱色活性。用亚甲基标准气体通过制备颗粒的固定床，考察了颗粒的光催化性能。由于粘结剂液体已覆盖钛，短时间内无法观察到分解反应。然后发现选择合适的粘结液是必要的。通过对制备颗粒的流态化试验，发现粘接钛细颗粒的剥离率约为30%。剥离率相对较小，证明制备颗粒的光触媒能力似乎没有丧失。从而实现了流化床对环境污染物的去除。少

According as the development of new materials proceeds, the demand of minimization of raw materials and improvement of the surface characteristics of solid particles are raised up. If the mono-core coating of fine particle is achieved, it means that useful fine materials with difficult handling are coated on the seed particle with easy handling. This condition means that the application range extends as functional fine particle, furthermore, it seems to be able to efficiently carry out the addition of the new function in these materials.In this experiment, the preparation of functional fine particle with the environmental cleanup function was tried by coating substrates such as Shirasu particles and glass beads with good handling ability with titanium fine particles which have environmental cleanup function but have strong cohesive property.As a result, by installing Teflon tube with the water repellency to the tip of draft tube, continuous coating operation of 300 minutes would be pos … More sible, due to the choking of the tube was suppressed. Then, regardless of degree of polymerization of PVA and type of the seed particle, it was possible to coat the titanium fine particles at the 90% of the seed particle surface. And the preparation particle was excited by the ultraviolet irradiation by fluorescent lamp, and it was confirmed that there was the activity with the photocatalyst in decoloring the methylene blue which passed in the preparation particle bed. By flowing standard gas of methylene through the fixed bed of the preparation particle, photocatalyst performance of the particles were examined. Due to the binder liquid has covered over the titanium, decomposition reaction in short time could not be observed. Then it was found that selection of the appropriate binder liquid was necessary. By the fluidization test of the preparation particle, it was found that the exfoliation rate of the adhesive titanium fine particle was about 30%. The exfoliation rate was comparatively small, then it was proven that the ability as a photocatalyst of the preparation particle seems to have not been lost. Then the removal operation of the environmental pollutant using fluidized bed operation could be expected. Less