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gtjtp100金蟲 (小有名氣)
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由表3知，表中分為四組A、B、C、D分別代表陳化溫度為50℃、60℃、70℃、80℃時陳化時間對堿式碳酸鎂的形成與其形狀影響的實驗狀況。（在A組中），在50℃下陳化1-15小時后生成針狀白色沉淀，經(jīng)XRD分析得此物質(zhì)為MgCO3•3H2O。（在B組中），在60℃下陳化1-12小時后，生成的白色物質(zhì)經(jīng)過光學(xué)顯微鏡觀察得知均為針狀的，但是經(jīng)XRD測定分析后發(fā)現(xiàn)，經(jīng)過1-6小時陳化后形成的為MgCO3•3H2O；陳化7-12小時后形成的物質(zhì)為MgCO3•3H2O與4MgCO3•Mg(OH)2•5H2O。而在60℃下陳化時間大于12小時后，生成的白色物質(zhì)為針狀物，經(jīng)XRD測定分析后發(fā)現(xiàn)其為4MgCO3•Mg(OH)2•5H2O。 （在C組中），在70℃下陳化1小時后，生成物經(jīng)過光學(xué)顯微鏡觀察及XRD分析確定其為3MgCO3•3H2O；當陳化2-3小時時，生成的物質(zhì)為MgCO3•3H2O和4MgCO3•Mg(OH)2•4H2O混合物，并且其晶體形態(tài)均為針狀；而當陳化時間大于4小時時，生成物質(zhì)為針狀4MgCO3•Mg(OH)2•4H2O。 （在D組中），在80℃下陳化0.5小時后，生成的物質(zhì)為球狀MgCO3•3H2O；當陳化0.5-1小時后，則生成的物質(zhì)為球狀MgCO3•3H2O和4MgCO3•Mg(OH)2•4H2O的混合物；隨著陳化時間的延長（大于1小時），生成的物質(zhì)4MgCO3•Mg(OH)2•4H2O。 比較四組結(jié)果，發(fā)現(xiàn)隨著陳化溫度的升高所需要的陳化時間縮短。同時當陳化溫度在70℃以下，所生成的物質(zhì)均為針狀，但是陳化溫度升高到80℃時，所生成的物質(zhì)則為球狀。這是因為當溫度過低時晶核的形成速度較晶粒的增長速度要快。隨著溫度的升高，二者增長速度均增大，但是晶粒的生長速度大于晶核的形成速率。 |
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gtjtp100
金蟲 (小有名氣)
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3樓2010-08-22 08:59:19
gtjtp100(金幣+3, 翻譯EPI+1): 2010-08-21 23:21:23
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Known from the Table 3, the table is divided into four groups A, B, C, D represent the aging temperature is 50 ℃, 60 ℃, 70 ℃, 80 ℃ aging time when the basic magnesium carbonate formation on the impact of its shape experimental conditions. (In the A group), at 50 ℃ aging 1-15 hours after the needle-like white precipitation generated by the XRD analysis of this substance may MgCO3 • 3H2O. (In the B group), at 60 ℃ for 1-12 hours after the aging, white matter are generated by the optical microscope that are needle-like, but determined by the XRD analysis showed that after 1-6 hours of aging formed for MgCO3 • 3H2O; aging 7-12 hours after the formation of the material for the MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 5H2O. At 60 ℃, aging time more than 12 hours after the resulting white needle-like material substances, determined by XRD analysis and found it 4MgCO3 • Mg (OH) 2 • 5H2O. (In the C group), aging at 70 ℃ 1 hour after the resultant through optical microscope observation and XRD analysis to determine the 3MgCO3 • 3H2O; when the aging 2-3 hours, the resulting material was MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 4H2O mixture, and its crystals are needle-like shape; and when the aging time is more than 4 hours, the generation of material for the needle 4MgCO3 • Mg (OH) 2 • 4H2O. (In the D group), aging at 80 ℃, 0.5 hours, the resulting material is spherical MgCO3 • 3H2O; when the aging 0. 5-1 hours later, the resulting material is spherical MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 4H2O in the mixture; with aging time (more than 1 hour), the resulting material 4MgCO3 • Mg (OH ) 2 • 4H2O. Comparison of four groups, we found that with the aging temperature, aging time required to reduce. At the same time when the aging temperature is below 70 ℃, are needle-like material generated, but the aging temperature to 80 ℃, the resulting material was spherical. This is because when the temperature is too low, the formation of nuclei than the grain growth rate faster. As the temperature increases, the growth rate were both increased, but the grain growth rate faster than the formation of nuclei. |
2樓2010-08-21 21:28:27
ringzhu 
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gtjtp100(金幣+1):20 2010-08-24 09:40:41
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Known from Table 3, the data is divided into four groups as A, B, C, D which represent experimental conditionsthe of the impact of aging time on formation and shape of the basic magnesium carbonate when aging temperature is 50 ℃, 60 ℃, 70 ℃, 80 ℃ (In group A), after aging for 1-15 hours at 50 ℃, needle-like white precipitation is formed and tested by the XRD analysis which indicates this as MgCO3 • 3H2O. (In group B), after aging for 1-12 hours at 60 ℃, observed by the optical microscope white matter are needle-like, but XRD analysis showed that MgCO3 • 3H2O is formed after 7-12 hours of aging ; MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 5H2O are formed after 1-6 hours of aging. and 4MgCO3 • Mg (OH) 2 • 5H2O which is white and needle-like is formed after more than 12h of aging at 60℃ according to XRD analysis。 (In group C), after aging for 1h at 70 ℃,3MgCO3 • 3H2O is formed according to optical microscope observation and XRD analysis. when aging 2-3h, the formation is the mixtrue of MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 4H2O which are both needle-like. when aging more than 4h, the 4MgCO3 • Mg (OH) 2 • 4H2O is formed. (In group D), after aging for 0.5h at 80 ℃,spherical 3MgCO3 • 3H2O is formed . when aging 0.5-1h, the formation is the mixtrue of spherical MgCO3 • 3H2O and spherical 4MgCO3 • Mg (OH) 2 • 4H2O. when aging more than 1h, the 4MgCO3 • Mg (OH) 2 • 4H2O is formed. Comparison of four groups showed that higer the aging temperature is, shorter the aging time is required . At the same time, when the aging temperature is below 70 ℃, the products are needle-like. however when the the aging temperature is more than 80 ℃, the products would be spherical. This is because when the temperature is low, the formation of nuclei is much faster than the growth of the grain. As the temperature increases, both growth rate were increased, but the growth rate is much faster than the formation of nuclei. |
4樓2010-08-22 13:51:55
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