聚丙烯酸钠在氯化法钛白粉砂磨分散中的工艺研究

Study on the technology of sodium polyacrylate in the sanding dispersion of chlorination process titanium dioxide

以氯化法工艺生产的钛白粉为原料,研究聚丙烯酸钠对钛白粉悬浮颗粒的砂磨分散,并与传统的硅酸钠和六偏磷酸钠分散剂进行比较,通过测试砂磨分散后的稳定性、粘度和粒度分布,确定聚丙烯酸钠对氯化法钛白粉具有较好的分散效果。同时,以钛白粉悬浮颗粒的稳定性和粘度,优化聚丙烯酸钠的用量,确定聚丙烯酸钠的最佳用量为钛白粉质量分数的0.2%,在该用量下的粒度分布均匀,其D(0.5)为0.331μm、D(0.9)为0.527μm,对钛白粉颗粒的团聚有较好分散作用。

In this paper, using titanium dioxide slurry prepared with chlorination process as raw material, the dispersion of titanium dioxide suspended particles sand grinded by sodium polyacrylate has been researched. Compared with the traditional dispersant sodium silicate and sodium hexametaphosphate, the stability, viscosity and particle size distribution of titanium dioxide after sand grinding were tested. The results show that the sodium polyacrylate has better dispersion effect on chlorination process titanium dioxide. Meanwhile, according to the stability and viscosity of titanium dioxide suspended particles, the sodium polyacrylate consumption was optimized. The optimum dosage of sodium polyacrylate is 0.2% of the mass fraction of titanium dioxide. Under this condition, the titanium dioxide has uniform particle size distribution, while the particle size D （0.5） is 0.331 μm and D（0.9） is 0.527 μm. It has good dispersion effect on the agglomeration of titanium dioxide particles.