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
查看参考文献30篇
文摘
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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
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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
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过程工程学报
,2009,9(2):300-306 【核心库】
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关键词
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甲醇
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NaAl(OH)_4溶液
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Al(OH)_3
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形貌
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粒度分布
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地址
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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
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1009-606X |
学科
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化学工业 |
基金
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国家自然科学基金
;
国家高技术研究发展计划(863计划)
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国家科技支撑计划项目
;
国家973计划
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文献收藏号
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CSCD:3587869
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