纳米活性氧化锌的煅烧方式与工业制备
旋流动态煅烧设备是由东北大学多名教师根据国内先进科技成果，针对无机盐深加工而开发的高科技产品。适用物料的分解、改性及提纯等的煅烧，其典型工艺图见干燥、煅烧系统流程图。加热装置产生的高温气体切向进入动态煅烧主炉，高温气体在旋转上升过程中与由物料输送装置切向加入的粉状物料混合，经煅烧炉的旋转加速段气固混合物料形成高速旋转上升状态，进行快速的传质传热过程，在1~3秒内完成煅烧过程。气固混合体经一级换热装置后，进入一级旋风分离装置，然后进入二级袋式回收装置，尾气由引风机引出。主要成品物料由一级旋风分离器排出，部分物料由二级回收装置排出。由于温度可控，物料在煅烧炉内分布均匀，煅烧比表面积大，因此煅烧时间短，煅烧均匀，产品质量高，完全实现连续化生产。
活性纳米氧化锌的老式生产工艺属于开放式生，工作条件恶劣、粉尘污染严重、生产工艺陈旧复杂，易造成过烧或烧不彻底现象。而且产品质量不稳定、产品回收率低。与现代工艺比较大约损失5～8%的成品。用回转窑方式煅烧氧化锌工作条件及效率会更差。然而在超微粉体材料的生产过程中，粒径、形貌以及主品位含量等重要指标均须通过良好的技术装备方能得以实现。
由辽宁东大粉体工程技术有限公司研发的“闪速动态煅烧法”不仅解决了传统方式的工作环境差、粉尘污染严重的问题，而且简化、缩短了工艺流程，又适合大型工业化连续生产，降低生产成本、提高经济效益。是一种实用煅烧装备技术。由辽宁东大粉体工程技术有限公司研制的氧化锌闪速动态煅烧技术是结合活性氧化锌的技术要求而进行的系统设计。其工作原理是：将粉体物料与加热的热空气混合后，同向流动形成质热交换，完成煅烧。煅烧后的氧化锌大大提高了比表面积。这是因为经过5-8秒钟瞬间煅烧，粉体颗粒瞬间由低温升至高温，在这个过程中颗粒会产生爆裂现象，爆裂后的表面随即得到修饰。旋流动态煅烧避免了颗粒的团聚现象。经过气固分离后获得高纯度的纳米活性氧化锌粉体。
在节能和环保方面，该系统利用煅烧尾气余热供给干燥机，既节约了能源也实际降低了生产成本，系统密闭.、无环境污染。
其技术特点:是连续操作.温度可控.气固混合充分.产品品质稳定.瞬间煅烧分解.产品无过烧或烧不透现象。有利于氧化锌的活性；回收率高，有效利用热源（组合煅烧：用煅烧的尾气作为干燥热源，节省25～30%）。
综合参数：产品技术指标：氧化锌(ZnO)含量:98-99.8% 比表面积:80Dynamic calciner for reactive zinc oxide
Active zinc oxide
Molecular formula: ZnO, molecular weight: 81.37.
Characteristic: white or light yellow, ball-shape, fine powder. Specific gravity: 5.47 smelting point: SD calcinatory
Calcining is the processes of changing character, purifying, and decomposition reduction. During the calcining the materials do static dynamic movement. The bigger the specific surface area is the faster the materials transfer heating. Eddy dynamic calcining is mixing the powder materials heated hot air makes a same direction movement. It is a new technology equipment for ensuring sufficient heat exchange, decomposition improving the quality of the products.
Working principle of the calciner
Calciner consists of air heater, mixer of gassolid, body of the calciner, separator collector of gas solid.
The materials are fed to the calciner by mixer of gas andsolid, mixed with the hot air heated by the heater. The materials move with a form of eddy, the calcining is finished in seconds. Then the gas and solid are separated discharged from discharge lips separately.
Performance of calciner
The temperature of the hot air in the calciner: 500 ～Fuel: solid (coal), gas (coal gas, natural gas), liquid (diesel oil, heavy oil)
Combustion mode: direct, indirect, internal external.
The main parts of the system:
Graft fans are usually used to make the system in negative pressure. Materials get heat by way of direct or indirect form. The end gas is separated by cyclone system, cooled by air. Bag wash water is used to collect productsclean air.
Group system of the drying calcining:
In order to utilize the end gassave energy, the end gas is used to supply heat to the drying system. It can preheat dehydrate the materials while reducing the temperature of end gas.
The user of dynamic calciner:
1. Taiwan Luchang Chemical Corporation ltd.
Taiwan Luchang Co.LTD
