微波制备晶种诱导水解生产金红石钛白工艺研究  

Rutile TiO_2 Production by Inductive Hydrolysis of Low Concentration Titaniferous Solution with Seed Crystals Prepared by Microwave

作　　者：张耀文[1] 唐思扬 袁绍军[1] 岳海荣[1] 刘长军[1] 李春[1] 梁斌[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《钢铁钒钛》2016年第4期29-34,共6页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金重点项目(21236004)

摘　　要：采用微波制备晶种诱导低浓度钛液水解，实现了160 g/L低浓度钛液的水解，对硫酸法钛白生产具有良好的节能效应。通过对偏钛酸进行TG与SEM分析，确定了偏钛酸煅烧的工艺参数。研究结果表明，微波制备晶种诱导水解工艺制备的偏钛酸具有高的转晶活性，可在不添加煅烧晶种的情况下850 ℃煅烧30 min即可完全转变为金红石晶型，晶种可进行长时间储存，容易实现工业化。研究了盐处理及煅烧参数对二氧化钛颜料性能的影响，结果表明，提高磷含量有利于提高金红石干粉白度，过低的钾含量会造成粒子烧结从而大幅降低金红石干粉白度。优化的盐处理参数，K2O 0.55%、P2O50.1%条件下以900 ℃煅烧90 min，可获得白度高、形貌较好、粒径均一（200～350 nm）的金红石二氧化钛。Low concentration of titaniferous solution （ 160 g/L） was inductively hydrolyzed with seed crys- tals prepared under microwave, which has a favorable energy-saving effect on TiO2 production by sulfuric acid process. The calcination parameters of metatitanic acid were determined by TG and SEM analysis. The results show that the metatitanic acid, obtained by inductive hydrolysis with seed crystals prepared under microwave,possesses a high crystalline transfer activity that it can completely convert to rutile crystals by calcination at 850 ℃ for 30 rain without any crystalline transfer additive. Furthermore, the prepared seed crystals can be stored for a long time making easy industrial application. The effects of salt treatment and calcination parameters on the pigmentary properties of TiO2 were also investigated. It is evidenced that in- creasing the phosphorus content is beneficial to improve whiteness of the mille TiO2 and it can be signifi- cantly reduced by agglomeration of the particles at too low concentration of potassium？ content. Ruille TiO2 with higher whiteness and more uniform size distribution （200- 350 nm） is obtained under the optimum treatment parameters of calcination at 900 ℃ for 90 win with 0.55% K20 and 0. 1% P2O5 added.

关 键 词：金红石 低浓度钛液 水解 晶种 微波制备 低温快速转晶 

分 类 号：TQ621.12[化学工程—精细化工]