Analysis of factors influencing the sedimentation height of hydrolyzed metatitanic acid
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摘要: 以某钛白粉厂生产数据为依据，统计分析了水解偏钛酸沉降高度对粒度分布和初品质量的影响规律。结果表明，随着水解偏钛酸沉降高度增加，水解偏钛酸D50呈现增加趋势，相应获得初品Tcs和Scx均呈现下降趋势，初品平均粒径呈现增加趋势，控制偏钛酸沉降高度在130 mm以下可以获得颜料性能较好的钛白粉。试验研究表明，水解钛液的TiO2浓度、F值、水解晶种加量和水解判灰时间均对水解偏钛酸的沉降高度和D50有较大影响。随水解钛液浓度增加，水解偏钛酸沉降高度呈下降趋势，随F值增加，水解偏钛酸沉降高度和D50呈现增加趋势，随水解晶种加量的增加，水解偏钛酸沉降高度呈下降趋势，随判灰时间的延长，水解偏钛酸沉降高度呈现先增加后减小的趋势。Abstract: Based on the production data of a certain titanium dioxide factory, the influence of the sedimentation height of metatitanic acid on its particle size distribution and titanium dioxide pigment properties was statistically analyzed. The results show that with the increase of sedimentation height, the D50 of metatitanate shows an increasing trend, while the Tcs and Scx of titanium dioxide pigment show a decreasing trend, and the average particle size shows an increasing trend. Controlling the sedimentation height of titanium dioxide below 130 mm can obtain titanium dioxide with better pigment properties. The experimental results show that the TiO2 concentration, F value, seed addition, and first boiling holding time of titanium liquid all have a significant impact on the sedimentation height and D50 of metatitanic acid. As the concentration of TiO2 increases, the sedimentation height and D50 of metatitanic acid show a decreasing trend. As the F value increases, the sedimentation height of metatitanic acid and D50 show an increasing trend. With the increase of seed addition, the sedimentation height of metatitanic acid shows a decreasing trend. With the extension of the first boiling insulation time, the sedimentation height of metatitanic acid shows a trend of first increasing and then decreasing.
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Key words:
- TiO2 /
- metatitanic acid /
- hydrolysis /
- sedimentation height /
- particle size distribution
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图 1 沉降高度与初品颜料性能的散点图
(a) Tcs ；(b)Scx
Figure 1. Scatter plot of settlement height and initial pigment performance
图 2 沉降高度对TiO2平均粒径的影响
Figure 2. Effect of settlement height on the average particle size of TiO2
图 3 水解偏钛酸浆料沉降高度与D50的散点图
Figure 3. Scatter plot of settlement height and D50 of metatitanic acid
图 4 不同沉降高度的偏钛酸烘干后的扫描电镜形貌
(a)127 mm；(b)122 mm；(c)105 mm；(d)85 mm
Figure 4. SEM of dried metatitanic acid with different settling heights
图 5 钛液指标对沉降高度的影响
(a)钛液浓度；(b)F值
Figure 5. Effect of titanium liquid index on settlement height
图 6 晶种加量和判灰时间对沉降高度的影响
(a)晶种加量；(b)判灰时间
Figure 6. The effect of seed addition and ash detection time on the settling height
表 1 沉降高度与初品颜料性能均值对应
Table 1. Settlement height and mean performance of primary pigments
沉降高度/mm Tcs Scx L a b 亮度 范围 均值 ＜100 92.97 1890.0 2.81 97.34 −0.49 3.23 95.16 100～110 105.65 1871.5 2.65 97.57 −0.49 3.37 95.03 110～120 113.60 1876.0 2.72 97.53 −0.52 3.35 95.35 120～130 126.78 1880.8 2.70 97.46 −0.47 3.55 95.25 130～150 142.63 1861.3 2.35 97.51 −0.47 3.70 95.30 ＞150 161.90 1841.0 2.41 97.33 −0.31 3.20 95.30 
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表 2 沉降高度均值与钛液指标的关系
Table 2. Relationship between mean settlement height and titanium liquid index
沉降高度/mm F值 总钛/
（g·L−1）铁钛比 固含量
×106稳定性/
mLD50/
μm范围 均值 ＜100 92.97 2.02 196.7 0.28 26 500 1.85 100～110 105.65 1.98 196.2 0.30 26 500 1.91 110～120 113.60 2.06 195.1 0.29 26 500 1.83 120～130 126.78 2.00 193.5 0.30 25 500 2.00 130～150 142.63 2.02 191.6 0.31 25 500 2.28 ＞150 161.90 1.98 189.9 0.31 26 500 2.33
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