Study on the effect of addition of zinc-based salt treatment agent on the performance of TiO2
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摘要: 以偏钛酸为原料，在偏钛酸中加入不同比例的盐处理剂，通过调整煅烧温度制备金红石含量98%～99%的二氧化钛。考察钾、磷、锌等盐处理加量对煅烧温度和钛白颜料性能的影响。然后通过SEM对钛白粉的形貌、粒度分布进行分析。结果表明：煅烧温度和锌盐加量呈线性负相关，和钾盐与磷盐加量呈线性正相关。随着ZnO加量的增加，金红石合格所需煅烧温度相应降低，随着K2O和P2O5加量的增加，金红石合格所需煅烧温度相应增加。随钾盐的增加消色力TCS和蓝相SCX均呈现先增加后减小的趋势；随磷盐增加，消色力TCS呈现下降趋势，蓝相SCX总体上呈现上升趋势；随锌盐增加，消色力呈现先增加后降低趋势。当金红石合格时，在锌系盐处理配方中，随着K2O含量上升，钛白平均粒径呈现增加趋势，离散系数先下降后增加；随着P2O5和ZnO含量上升，钛白平均粒径呈现下降的趋势，离散系数先下降后增加。其最佳加量范围为K2O: 0.34%～0.38%，P2O5: 0.03%～0.05%，ZnO: 0.10%～0.13%。Abstract: Using metatitanic acid as a raw material, adding different proportions of salt treatment agents to metatitanic acid, and adjusting the calcination temperature to prepare TiO2 with a rutile content of 98% to 99%. The influence of K2O, P2O5, ZnO addition on the calcination temperature and the properties of TiO2 pigments were investigated. Then the morphology and particle size distribution of the TiO2 were analyzed by SEM. The results show that the calcination temperature and the ZnO addition are linearly negatively correlated, while the K2O and P2O5 additions are linearly positively correlated. With the increase of the amount of ZnO, the calcination temperature required for rutile to be qualified is correspondingly reduced. With the increase of the amount of K2O and P2O5, the calcination temperature for rutile to be qualified increases accordingly. With the increase of K2O, both TCS and SCX showed a trend of first increase and then decrease; with the increase of P2O5, TCS showed a downward trend, and SCX showed an overall upward trend; with the increase of ZnO, TCS showed a trend of first increase and then decrease. When rutile is qualified, the average particle size of titanium dioxide shows an increasing trend with the increase of K2O content in the zinc-based salt treatment formula,, and the coefficient of variation first decreases and then increases. With the increase of P2O5 and ZnO content, the average particle size of the titanium dioxide shows a downward trend, and the coefficient of variation first decreases and then increases. The optimal dosage range for K2O is between 0.34% and 0.38%, P2O5 0.03% to 0.05% and ZnO 0.10% to 0.13%.
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Key words:
- titanium dioxide /
- salt treatment /
- particle size distribution /
- coefficient of variation
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图 1 盐处理剂加量对煅烧温度的影响
Figure 1. The influence of the amount of salt treatment agent on the calcination temperature
图 2 盐处理剂加量对钛白颜料性能的影响
Figure 2. The influence of the amount of salt treatment agent on the TCS and SCX of TiO2
图 5 ZnO加量对TiO2形貌的影响
Figure 5. The influence of the amount of ZnO on the morphology of TiO2
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