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甲醇分解铝酸钠溶液制备大颗粒氢氧化铝的工艺与表征
Preparation and Characterization of Al(OH)_3 Coarse Particles by Decomposition of Caustic Aluminate Solution with Methanol

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文摘 对甲醇分解NaAl(OH)_4溶液制备大颗粒Al(OH)_3进行了工艺研究,考察了分解温度、分子比(Na_2O/Al_2O_3摩尔比)、Na_2O浓度、硅量指数(Al_2O_3/SiO_2质量比)、搅拌速度和甲醇用量对产品粒度和形貌的影响.结果表明,在NaAl(OH)_4溶液的Na_2O浓度为180 g/L、分子比为1.5~1.6,硅量指数550以上及甲醇与NaAl(OH)_4溶液等体积的优化条件下,控制分解温度60℃,可得到平均粒径达80 μm的球形Al(OH)_3.甲醇的加入改变了Al(OH)_3生长基元的径向和轴向生长速率,甲醇量越人,径向生长速率越快,生长基元越薄.当甲醇与NaAl(OH)_4溶液体积比为1:1时,Al(OH)_3生长基元的厚度在100 nm左右.随分解温度升高,Al(OH)_3由Bayerite型向Gibbsite型转变,热重-差热值与理论值吻合.
其他语种文摘 Decomposition of sodium aluminate solution using methanol for production of coarse Al(OH)_3 particles was studied. The effects of reaction temperature, concentration of caustic aluminate solution, caustic ratio, silica index, stirring intensity and methanol amount on the particle size and morphology of Al(OH)_3 were examined. The results showed that spherical coarse particles of Al(OH)_3 could be obtained under the conditions of solution composition with about 180 g/L Na_2O, 1.5~1.6 molecular ratio and mass ratio of alumina to silica larger than 550, volume ratio of solution to methanol 1:1, and temperature 60 ℃. Their average particle size could reach about 80 μm. The longitudinal and radial growth speeds of Al(OH)_3 growth unit were changed by addition of methanol. The radial growth speed was faster and growth unit became thinner with the more amount of methanol, for instance, with a value of about 100 nm when volume ratio of sodium aluminate solution to methanol was 1:1. Furthermore the crystal structure of Al(OH)_3 particles changed from Bayerite to Gibbsite with the increase of temperature while the weight loss agreed with the theoretical value by DSC-TGA analysis.
来源 过程工程学报 ,2009,9(2):300-306 【核心库】
关键词 甲醇 ; NaAl(OH)_4溶液 ; Al(OH)_3 ; 形貌 ; 粒度分布
地址

中国科学院过程工程研究所, 中科院绿色过程与工程重点实验室,湿法冶金清洁生产技术国家工程实验室, 北京, 100190

语种 中文
文献类型 研究性论文
ISSN 1009-606X
学科 化学工业
基金 国家自然科学基金 ;  国家高技术研究发展计划(863计划) ;  国家科技支撑计划项目 ;  国家973计划
文献收藏号 CSCD:3587869

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1 薛金 低碳醇强化铝酸钾溶液晶种分解过程研究 高校化学工程学报,2019,33(3):619-627
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