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.     

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。     

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。     

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。     

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.     

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...     

利用太阳能和自然风制备碱式硫酸镁晶须

采用雷州苦卤为原料,氢氧化钠和硫酸钠为沉淀剂,利用太阳光加热、自然风带走水分的方法制备了质优的碱式硫酸镁晶须,用正交法试验了各种最优的制备条件,包括氢氧化钠和硫酸钠的浓度和太光阳照射时间,最优条件如下:卤水与Na2 SO4/NaOH混合溶液的体积比为5:1,太阳照射时间为180 h.文章采用傅里叶变换法指认生长基元[M...     

有机溶剂-微波-水热法制备氢氧化镁晶须

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,采用微波-水热法制备了氢氧化镁晶须。实验发现在水热温度为180℃,反应时间为1.5 h的条件下,氢氧化镁晶须产率与有机溶剂在反应体系中的质量分数有关,当质量分数为30%时可获得产率为80%的氢氧化镁晶须,但继续增加有机溶剂的质量分数晶须产率不再增加。扫描电镜照片显示粒子呈晶须形状、粒度分布均匀、分散性好、晶形好、纯度高。本实验不仅生产工艺简单,且生产成本低,具有较高的经济效益,可望充分利用盐湖镁资源进一步中试。