摘要
通过在结晶过程添加纳米SiO2颗粒和表面活性剂F127影响和控制NaCl晶体的生长过程，得到微米级的单分散NaCl微粒．扫描电子显微镜观察显示纳米SiO2颗粒附着于NaCl粒子表面，粒度分析测试表明微粒的粒度分布范围为0．1～15μm，体积平均粒径为7．25μm．添加纳米SiO2后，微粒的单分散性和流动性变好，流速达到4-6mL／s，松装密度增大到0．6-0．8g／cm^3，吸湿性下降．SEM和FT-IR、吸湿性测试表明这种制备方式改进了NaCl粒子的表面性能，可以有效降低其吸湿性能和硬团聚现象，改进流动性和分散性．
By means of adding SiO2 nano-particles and surfactant F127 in the crystallization process of NaCl to modify the surface of crystals, the micrometer NaCl powder was prepared. The SEM analysis shows that SiO2 particles are adsorbed to the surface of NaCl crystals. The size distribution scope is 0.1-15 μm. It is found that the more the SiO2 nano-particles are added, the better the dispersion and fluidity become. The bulk density of NaCl particles is 0.6-0.8 g/cm^3. The volumetric flow rate of NaCl particles is 4-6 mL/s. The results imply that such modification could effectively avoid water absorption and hard agglomeration of particles and improve their dispersion and fluidity.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第4期829-832,共4页
The Chinese Journal of Process Engineering
基金
国防预研基金资助项目(编号:411010208)
关键词
NaCl颗粒
纳米SIO2颗粒
表面改性
团聚
sodium chloride particles
SiO2 nano-particles
surface modification
agglomeration
