Study on effect of Al-Zn composite salt treatment on the quality of rutile TiO2
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摘要: 以水解偏钛酸为原料，开展铝锌复合盐处理对金红石型二氧化钛质量的影响研究。通过调整煅烧温度制备金红石转化率合格的二氧化钛样品，考察Al2O3和ZnO加量对金红石合格所需煅烧温度的影响。然后对金红石合格的二氧化钛样品的粒度分布和形貌以及颜料性能进行分析。结果表明：在铝锌复合盐处理体系中，Al2O3加量较低时促进金红石转化，Al2O3加量较高时抑制金红石转化；ZnO促进金红石转化。随着Al2O3加量的增加，样品的TCS和SCX先增加后降低、平均粒径先降低后增加、离散系数变大、长径比增加、粒子逐渐由椭球形长成长条形；Al2O3加量0.15%时样品TCS和SCX最好、平均粒径最小。随着ZnO加量的增加，样品的TCS和SCX、平均粒径、离散系数、长径比均无明显变化规律；Al2O3加量0.15%时随ZnO加量的增加，样品平均粒径减小，长径比减小，粒子逐渐由长条形长成椭球形。Abstract: Using hydrolyzed metatitanic acid as raw materials, the effect of Al-Zn composite salt treatment on the quality of rutile TiO2 was studied. Rutile TiO2 samples were prepared by adjusting the calcination temperature. The effects of the addition of Al2O3 and ZnO on the calcination temperature required for rutile qualification were investigated. The pigment properties, particle size distribution and morphology of the rutile TiO2 were then analyzed. The results show that for the Al-Zn composite salt treatment system, the low addition of Al2O3 promotes the rutile transformation, and the high addition of Al2O3 inhibits the rutile transformation; ZnO promotes rutile transformation. With the increase of Al2O3 dosage, TCS and SCX first increase and then decrease, the mean diameter first decreases and then increases, the coefficient of variation increases, the length-diameter ratio increases, and the particles gradually grow from ellipsoid to strip. When the dosage of Al2O3 is 0.15%, the TCS and SCX of the sample are the best and the average particle size is the smallest. With the increase of ZnO dosage, the TCS and SCX, average particle size, dispersion coefficient and aspect ratio have no obvious variation rules. When the addition of Al2O3 is 0.15%, with the increase of ZnO addition, the mean diameter decreases, the length-diameter ratio decreases, and the particles gradually grow from long strip to ellipsoid.
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Key words:
- titanium dioxide /
- metatitanic acid /
- salt treatment /
- mean diameter /
- coefficient of variation /
- length-diameter ratio
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图 1 不同Al2O3和ZnO加量下二氧化钛金红石转化合格所需的煅烧温度
Figure 1. Calcination temperature required under different dosage of Al2O3 and ZnO
图 2 不同Al2O3和ZnO加量下二氧化钛平均粒径的变化
Figure 2. Influence of the amount of Al2O3 and ZnO on the mean diameter of TiO2
图 3 不同Al2O3和ZnO加量下初品离散系数的变化
Figure 3. Influence of Al2O3 and ZnO addition on the coefficient of variation of TiO2
图 4 不同Al2O3和ZnO加量下初品长径比的变化
Figure 4. Influence of Al2O3 and ZnO addition on the length-diameter ratio of TiO2
图 5 ZnO加量0.15%，Al2O3加量分别为0、0.15%、0.25%、0.35%时样品SEM形貌
Al2O3加量:(a) 0; (b) 0.15%; (c) 0.25%; (d) 0.35%
Figure 5. SEM images showing the influence of the amount of Al2O3 on the morphology of TiO2 (the amount of ZnO is 0.15%)
图 6 Al2O3加量0.15%，锌盐加量分别为0.05%、0.10%、0.15%时样品SEM形貌
锌盐加量: (a) 0.05%; (b) 0.10%; (c) 0.15%
Figure 6. SEM images showing the influence of the amount of ZnO on the morphology of TiO2 (the amount of Al2O3 is 0.15%)
图 7 不同Al2O3和ZnO加量下二氧化钛的TCS变化
Figure 7. Influence of the amount of Al2O3 and ZnO on the TCS of TiO2
图 8 不同Al2O3和ZnO加量下二氧化钛的SCX变化
Figure 8. Influence of the amount of Al2O3 and ZnO on the SCX of TiO2
表 1 试验所用主要设备
Table 1. Main experimental facilities for sample preparation
名 称 型号 生产商 用 途 马弗炉 TM3010P 北京盛安科技有限公司 煅 烧 三头研磨机 RK/XPM-Ø120*3 武汉洛克粉磨设备制造有限公司 样品研磨 色差仪 Ci6X American X-rite Pantone 颜料性能检测 拉曼光谱仪 DXR532 ThermoFisher 金红石含量检测 扫描电镜 JSM-7001F 日本电子株式会社 形貌和粒度检测 X-ray衍射仪 X'Pert Pro 帕纳科 晶型分析 
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表 2 盐处理方案
Table 2. Scheme of salt treatment
% 编号 K2O P2O5 ZnO Al2O3 煅烧晶种 ZnO-0.05%系列 0.37 0.03 0.05 0 5.5 0.37 0.03 0.05 0.05 5.5 0.37 0.03 0.05 0.15 5.5 0.37 0.03 0.05 0.25 5.5 0.37 0.03 0.05 0.35 5.5 ZnO-0.10%系列 0.37 0.03 0.10 0 5.5 0.37 0.03 0.10 0.05 5.5 0.37 0.03 0.10 0.15 5.5 0.37 0.03 0.10 0.25 5.5 0.37 0.03 0.10 0.35 5.5 ZnO-0.15%系列 0.37 0.03 0.15 0 5.5 0.37 0.03 0.15 0.05 5.5 0.37 0.03 0.15 0.15 5.5 0.37 0.03 0.15 0.25 5.5 0.37 0.03 0.15 0.35 5.5
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