Microflow precipitation reaction is an effectively method for preparing high quality nanoparticles. In this study, BaSO₄ nanoparticles were successfully prepared from BaS black ash in a simple capillary microreactor. Two important microflow parameters, feed flow velocity and residence time, on morphology, structure, component, average particle size (d_av) and coefficient of variation (CV) of the as-synthesized product are investigated. The results show that well-dispersed ellipsoidal nanoparticles of BaSO₄ with purity >99 wt% can be prepared using this novel method. High flow velocity is beneficial for producing small particles with low CV, and short residence time is also good for slightly small particles but with high CV. The d_av and CV values are in the range of 33.8∼53.5 nm and 0.32∼0.39, respectively. In addition, the preparation of the BaSO₄ product by this new method is compared with those by precipitation in other typical reactors. Combined with the simplicity of the microchannel structure, continuity of process operation and atomic economy of the raw materials, this proposed method is effective for preparing high quality BaSO₄ nanoparticles with narrow particle size distribution.

微流沉淀反应是制备高质量纳米粒子的有效方法。在这项研究中，BaSO ₄纳米颗粒在一个简单的毛细管微反应器中成功地从 BaS 黑灰中制备出来。研究了进料流速和停留时间这两个重要的微流参数对合成产物的形貌、结构、组分、平均粒径 (d _{av ) 和变异系数 (CV) 的影响。}结果表明，使用这种新方法可以制备纯度>99 wt%、分散良好的BaSO _{4椭圆体纳米粒子。}高流速有利于产生低 CV 的小颗粒，短停留时间也有利于产生稍小但 CV 高的颗粒。_大卫_和 CV 值分别在 33.8∼53.5 nm 和 0.32∼0.39 范围内。此外，将用这种新方法制备BaSO ₄产品与在其他典型反应器中通过沉淀制备BaSO 4 产品进行了比较。结合微通道结构的简单性、工艺操作的连续性和原料的原子经济性，该方法可有效制备粒径分布窄的高质量BaSO _{4纳米粒子。}