沉降——分离法除去氢氧化镁中的氯

研究了絮凝剂法及控制反应温度法两种沉降——分离方法除去水氯镁石-氢氧化钠法制备氢氧化镁中的氯。     

几种重要晶须生长基元稳定能计算的数学方法

大量从液相体系生长出的都表明其生长机理服从"拓展的ACP机制".而在拓展的ACP机制中,一个非常重要的环节就是基元稳定能的计算.能否对基元进行精准的稳定能计算,将决定晶须能否成功制备.计算方法是以稳定能计算式为依托,先画出基元空间几何图形,然后利用余弦定理求解出三角形的边长,这些边长正是离子之间的距离.继而将求解得到的...     

用闪蒸法处理利用液化石油气残液的研究

本文介绍了液化石油气残液的组成。借助计算机模拟闪蒸操作,从理论的角度出发分析处理利用残液的可行性。通过这种既简单又经济的方法可将液化石油气残液加工成石油醚和汽油。     

水热法制备无机粉体材料进展

水热法在制备无机粉体材料中有着极其重要的应用，文章综述了水热法在近年来的进展并展望了它的发展前景。     

Al3(SO4)2(OH)5H2O与α-Al2O3晶须的制备及其生长机制

采用液相沉淀及烧结方法制备了Al3(SO4)2(OH)5H2O与α-Al2O3晶须,样品采用XRD、SEM及G-DTA等对样品物相、形貌及热行为进行了表征,结果表明晶须样品的分散性好,粒度分布均匀、表面光滑,Al3(SO4)2(OH)5H2O与α-Al2O3晶须品质优良.又从“生长基元”角度出发,讨论了Al3(SO4)2(OH)5H2O晶须的形成机制,其生长过程是生长基元是八面体[Al-(OH)6]3-与HSO4-往某一晶面稳定叠合生长的结果,Al3(SO4)2(OH)5H2O晶须经热分解后,其形貌不变,最终变为α-Al2O3晶须.     

Mg<Subscript>2</Subscript>(OH)<Subscript>2</Subscript>CO<Subscript>3</Subscript>·3H<Subscript>2</Subscript>O whiskers growth mechanism

From the perspective of growth units, the growth mechanism of Mg₂(OH)₂CO₃·3H₂O whisker is investigated in this paper. Results show that the growth morphology of Mg₂(OH)₂CO₃·3H₂O whisker is consistent with the model of anion coordination polyhedron growth units. The growth solution Raman shift of Mg₂(OH)₂CO₃·3H₂O was monitored using Raman spectroscopy. The growth units are [Mg-(OH)₄]^2- and H₂CO₃. The growth process of Mg₂(OH)₂CO₃·3H₂O whisker is as follows: growth unit [Mg-(OH)₄]^2- first incorporates into the larger dimension [Mg-(OH)₄] _n ^2- , then the [Mg-(OH)₄] _n ^2- combines with H₂CO₃ into a linear skeleton Mg₂(OH)₂CO₃ in the same line. Mg₂(OH)₂CO₃ combines with H₂O by hydrogen bonds and ultimately transforms into Mg₂(OH)₂CO₃·3H₂O whisker. Magnesium carbonate whiskers have a layered structure, each of which is made of magnesium, carbon, oxygen, with H₂O in between each layer. When skeletons are superimposed within the same plane as a parallelepiped one, they grow into solid cuboid-shaped whiskers. When the parallelepiped skeletons planes combine with each other through the cascading links, they grow into hollow cylindrical whiskers.     

Growth habit of the basic oxysulfate magnesium whisker

The growth habit of the basic magnesium oxysulfate whisker was investigated based on the theoreticalmodelof anion coordination polyhedron growth units.It is found that typicalbasic magnesium oxysulfate whisker growth is consistent with anion tetrahedralcoordination incorporation rules.The growth units of basic magnesium oxysulfate whiskers are [Mg-(OH)_4]~(2-) and HSO_4~-.[Mg-(OH)_4]~(2-) is the favorable growth unit and whisker growth is in the direction of the [Mg-(OH)_4]~(2-) combination.A plurality of [Mg-(OH)_4]~(2-) s combine and become a larger dimensionalgrowth unit in a one-dimensionaldirection.Then HSO_4~- and larger dimensionalgrowth units connect as basic magnesium sulfate whiskers,according to the structuralcharacteristics of the basic magnesium sulfate whisker,which can guide the synthesis of magnesium hydroxide whisker.     

有机溶剂--水热法制备阻燃球形氢氧化镁

以青海东台水氯镁石混合物为原料，以含一定量有机溶剂的氢氧化钠为沉淀剂，采用反向沉淀法，利用有机溶剂的疏水特性在水热反应釜合成球状氢氧化镁粒子。通过XRD，SEM，TEM等手段表征了产品的属性及形貌特征，结果表明产品粒子呈球形，粒度分布均匀，分散性好，晶形好，纯度高。该方法既简化了制备工艺，又降低了成本，可望进一步工业放大。研究了有机溶剂在反应体系中的质量分数、水热反应温度及反应时间对氢氧化镁晶体形状的影响，当有机溶剂的质量分数为35％、水热反应温度190℃、反应时间5h时，可以制得球形的氢氧化镁。     

利用太阳光热作热源制备碱式碳酸镁晶须

采用雷州盐场苦卤为原料,碳酸氢钠和碳酸钠组成的混合液为沉淀剂,利用太阳光作为热源及自然风吹的方法,制备了优质的碱式碳酸镁晶须,用正交法探索了碳酸氢钠和碳酸钠混合液与苦卤的体积比和太光阳照射时间,得到最优条件是:卤水与NaHCO3/Na2CO3混合溶液的体积比为1 ∶ 1,太阳照射时间为80 h.扫描电镜(SEM)示碱式...