氧化铝

To find and confirm the most effective preparing technology, the effect of sintering temperature and calefactive velocity upon mechanical properties and microstructures of the materials before and after infiltration were studied. In order to control the coefficient of thermal expansion and colors of the glass as well as the fluidity and infiltration property of the melted glass, we modified the formula of the glass.

在材料制备的同时，研究和比较了氧化铝升温速率及烧结温度对玻璃渗透前后材料的力学性能和微观结构的影响，以期寻求最佳的制备工艺；并改进渗透玻璃配方，以调控玻璃的热膨胀系数和颜色以及在高温下的流动性、浸润性。

The main steps include as follows: CO2 is led into the mother liquor of sodium meta-aluminate to carry out carbon content decomposing; the primary separation between the aluminum and the gallium is realized by primary carbonatation to filter out sodium hydroxide; secondary carbonatation is carried out on the filtrate to obtain the deposit of the complex salt of gallium and aluminum; a sodium carbonate crystal is obtained after the filtered filtrate is condensed and vaporized; the deposit of the complex salt of gallium and aluminum is dissolved in the mother liquor of sodium meta-aluminate; the processes are repeated until the proportion of gallium and aluminum in the complex salt of gallium and aluminum is larger than 1/340; then the complex salt of gallium and aluminum is added into the NaOH liquor and electrolyzed, thus obtaining the metal gallium with a purity larger than 99.9 percent which reaches the level of 3; simultaneously, the byproducts of the aluminum hydroxide and the sodium carbonate during the process of carbonatation by steps are obtained.

主要步骤包括：向铝酸钠母液中通入CO 2 进行碳分分解，一次碳酸化实现铝镓的初次分离；过滤出氢氧化钠，滤液进行二次碳酸化获得镓铝复盐沉淀，过滤后滤液经浓缩蒸发获得碳酸钠晶体，铝镓复盐沉淀溶解在偏铝酸钠母液中，重复上述过程直至铝镓复盐中的镓铝比例大于1/340，将其加入到NaOH溶液中，电解可获得纯度＞99.9％的金属镓，达到3N级水平同时在分步碳酸化的过程中获得氢氧化铝和碳酸钠副产品。

CaSiO〓 came out to be major crystal phase in glazes with high CaO/MgO ratio. Relatively, melilite and clinopyroxene became major crystal phase when CaO/MgO ratio neared 1 or when MgO was more than CaO.

在釉式中其它组分固定时，氧化铝、氧化硅含量较低时，熔体粘度较小，有利于形成晶体结构简单的晶相；对同结构的晶体而言，有利于晶体的快速生长。

Ceramic Microcrystalline abrasive, CMA, is a revolutionary generation of abrasives. The abrasive grains, composed of large number of sub-micron crystals, are designed to fracture conchoidally when stressed.

陶瓷微晶磨料是具有革命性的新一代磨料，其中每个磨粒都是由许许多多的亚微米晶粒组成的氧化铝陶瓷，因此也称陶瓷磨料。

Chapter 3: Synthesis of 2-aroyl-l,3,5-triaryl-4-carbethoxy-4-cyanocyclohexanols from chalcones with ethyl cyanoacetate is carried out in excellent yields with KF/basic alumina as catalyst under ultrasound irradiation.

第三章：研究了超声辐射下，以碱性氧化铝固载氟化钾为催化剂，利用查耳酮和氰乙酸乙酯合成2-芳酰基-1，3，5-三芳基-4-乙酯基-4-氰基环己醇。

It is convenient for sinter to be leached, and the secondary reaction appears little. The slurry after sinter leaching is transferred into autoclave for desilicification at about 170℃, and the siliceous modulus of solution reaches more than 200. Then some lime is added for deep-desilication at normal pressure, the siliceous modulus of solution increases more than 600 even if the Al2O3 content is more than 200g/L.The SiO2 coefficient in hydrate garnet from deep-desilication is more than 0.28. Under conditions of the addition of seed and application of novel technology of carbonization, the contents of Na2O and SiO2 in product are less than 0.37% and 0.025%, respectively.

实验结果显示：烧成的熟料溶出条件宽松，二次反应程度弱；溶出浆液在170℃左右直接进行加压脱硅，脱硅后溶液的硅量指数大于200，再加入适量的石灰进行深度脱硅，即使溶液中氧化铝浓度超过200g/L时，精液的硅量指数也大于600，且得到的水化石榴石中二氧化硅饱和系数大于0.28；通过加入晶种和采用新的碳酸化分解工艺制度，产品中的SiO2 含量降至0.025%， Na2O含量小于0.37%；加入表面活性剂，不仅能将碳分母液蒸发至Na2OT浓度大于300g/L，而且还可有效减缓表面上结疤的形成速度。

Furthermore,desilicify indices cannot be optimized.It is disadversage to reduce production cost and improve the quality of products.

为进一步提高氧化铝产量、优化指标、节能降耗，对脱硅工序进行改造势在必然。

The method can reduce greatly the job amount of fine milling, the ore milling cost and power consumption and raise alumina recovery rate, and is economically beneficial compared with available foam floating desiliconization technology.

本发明的方法，大大降低了细磨作业量，降低了磨矿费用和能耗，有效地提高了氧化铝回收率，与已有的泡沫浮选脱硅技术相比，经济效益显著。

Alumina Bayer production desiliconization workshop, easy to coke possession of the road, easy to use separate Pressure Seal Globe Valves valve type, valve seat can be place, and carbide seal pair of DC-style cut-off valve or DC-type throttle valve.

氧化铝拜耳法生产中的脱硅车间、易结焦的管路上，易选用阀体分开式、阀座可去处的、硬质合金密封副的直流式截止阀或直流式节流阀。

A new method using laser milling of Al2O3 ceramic based on controlling deteriorative layer is presented in which the process does not use any assistant gas.

介绍一种基于变质层控制的氧化铝陶瓷激光铣削方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。