摘要:
向水合二氧化钛中分别单独添加氢氧化钾、磷酸、硫酸锌,或者同时添加以上三种盐处理剂,然后将制备好的样品放入马弗炉中煅烧,利用拉曼光谱仪检测煅烧后样品的金红石转化率。结果表明:单独添加氢氧化钾或者磷酸时,随着加入量的增多,对金红石转化率的抑制作用越强,且温度越低表现出的抑制效果越明显。加入量越多,金红石转化率对温度越敏感。但当温度较高时,温度将成为影响金红石转化率的主因。单独添加硫酸锌时,随着硫酸锌加量的增加,对金红石转化率的促进作用越强,高于820℃时,温度转变为促进金红石转化的主要因素。正交试验结果显示对金红石转化率影响主次为:磷酸>硫酸锌>氢氧化钾,利用正交试验建立了加量、温度和金红石转化率的关系式:Y(Y≥97)=90.9+0.09X1-5.30X2+0.42X3+0.009 6X4。
Abstract:
Potassium hydroxide,phosphoric acid and zinc sulfate were separately or overall added to the titanium dioxide hydrated for calcination,and the rutile conversion rate of the samples after calcination was detected by Raman spectrometer.The results show that with increase in the addition of single potassium hydroxide or phosphoric acid,the inhibition effect on rutile conversion is stronger,and the inhibition is more obvious at lower temperatures.Furthermore,the conversion rate of rutile is more sensitive to the calcination temperature at higher addition amount of potassium hydroxide or phosphoric acid,while it is mainly determined by the temperature at higher calcination temperatures.Using zinc sulfate as the agent,the conversion rate of rutile increases with increase in the addition amount.When it is higher than 820 ℃,the temperature becomes the main factor for promoting the conversion of rutile.The orthogonal test results show that the influence order of the factors on rutile conversion is phosphoric acid＞zinc sulfate＞potassium hydroxide.A relationship between the conversion rate of rutile and addition amount of salt treating agent,calcination temperature,i.e.Y（Y≥97）=90.9+0.09X1-5.30X2+0.42X3+0.009 6X4,is established via the orthogonal tests.
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