常温下重质碳酸钙的研磨改性一体化工艺研究

在粒径为45 μm重质碳酸钙的浆料中加入硬脂酸，利用研磨改性法，在研磨粉碎的同时制备了改性碳酸钙浆料，烘干粉碎后再对碳酸钙干粉进行改性。利用激光粒度分析等手段分别对碳酸钙干粉的粒度、表面活化度、吸油值、白度做了研究。结果发现，常温下可以实现重质碳酸钙研磨改性一体化工艺。研磨后碳酸钙颗粒的粒径由45 μm降至2 μm。随着硬脂酸的添加量逐渐增加，重质碳酸钙的活化度增加，吸油值下降。当硬脂酸的添加量增至2%（质量分数）后，重质碳酸钙的活化度超过98%，吸油值降至0.267 g/g。重质碳酸钙研磨改性一体化工艺有利于降低重质碳酸钙的生产成本，增加产品的竞争力。

Integration technology study on grinding and modification ofground calcium carbonate under room temperature

Adding stearic acid to 45 μm ground calcium carbonate（GCC） pulp，modified CaCO3 pulp was prepared bygrinding modification method，i.e.abrasive grinding and modification were performed simultaneously.Then CaCO3 powder was modified again after drying and crushing. Particle size，surface activation degree，oil absorption， and whiteness of the CaCO3 powder were analyzed by laser particle size analyzer and other analysis methods.It was found that the integration of abrasive grinding and modification for GCC could be realized simultaneously under room temperature.The particle size of CaCO3  was reduced to 2 μm from 45 μm after the abrasive grinding.With the increasing amounts of stearic acid，the activation degree of GCC increased，but its oil absorption decreased.When the amounts of stearic acid increased to 2%（mass fraction），the activation degree of GCC was over 98% and oil absorption reduced to 0.267 g/g.Results showed that the integration technology of abrasive grinding and modification for GCC have great significance to reduce the production cost and increase the competitiveness of the products.