镁

The industry magnesia mainly uses in making the ceramics, the enamel, the fire-proof material and so on; In the polishing compound, the adhesive, in the paint manufacture takes the stopping; In the artificial fiber, the rubber (chloroprene rubber, fluorine rubber) make the promoter and the catalyst; Makes the antacid on the medicine in the laxative, uses in treating the hyperacidity, the stomach and duodenum ulcer; May take the hard sugar purification is the decolorant in the food processing, the ice cream pH value conditioner and so on; In the construction profession, the magnesia may the manufacturing contain the magnesium special cement and the heat preservation board and so on; The biggest use is serves as the fertilizer and domestic animal's feed in the agriculture, causes the plant and in the animal metabolism process principal element, when serves as cow's feed, may prevent because to lack nervous system function being out of balance which the magnesium causes, namely the so-called forage grass convulsion gets sick; Uses in the chemical industry making the metal magnesium and the magnesium chemical, like magnesium sulfate, magnesium chloride as well as other chemicals; Moreover also uses in the water treatment, the detergent which the flue was mad uses in the glass, the dye, the electric cable, the silcon steel industry, the uranium processing, the electronics industry, the insulation material industry, as well as uses in professions and so on petroleum chemical additive, casting, phenolic plastic.

工业氧化镁主要用于制造陶瓷、搪瓷、耐火材料等；在抛光剂、黏合剂、油漆的制造中作为填充料；在人造纤维、橡胶中作促进剂和催化剂；在医药上作抗酸剂于轻泻剂，用于治疗胃酸过多、胃和十二指肠溃疡病；在食品加工上可作为砂糖精制是的脱色剂，冰淇淋的pH值调节剂等；在建筑行业中，氧化镁可生产制造含镁特种水泥和保温板等；在农业上最大用途是用作肥料和牲畜的饲料，使植物和动物代谢过程中的主要元素，用作奶牛的饲料时，可防止因缺镁而引起的神经系统机能失调，即所谓牧草性痉挛病；在化学工业中用于制造金属镁和镁化学品，如硫酸镁、氯化镁以及其他化学品；另外也用于水处理，烟道气的洗涤剂用于玻璃、染料、电缆、硅钢工业、铀加工、电子工业、绝缘材料工业，以及用于石油添加剂、铸造、酚醛塑料等行业。

A large difference is found between the obtained metastable phase diagram at 35 ℃ and Vant Hoffs stable phase diagram at 25 ℃. The crystallization regions of schoenite(K2SO4*MgSO4*6H2O), epsomite(MgSO4*7H2O), magnesium sulfate pentahydrite(MgSO4*5H2O) and starkeyite(MgSO4*4H2O) disappear and the crystallization regions of leonit and astrankit are greatly incresed.

所得35 ℃介稳相图与Vant Hoff 25 ℃稳定相图比较有较大区别：软钾镁矾（K2SO4*MgSO4*6H2O）、七水硫酸镁、五水硫酸镁及四水硫酸镁结晶区域消失，钾镁矾和钾盐镁矾结晶区域显著扩大。

Due to the ability of the bivalent magnesium cation to form stable chelate complexes with carbonyl compounds,magnesium methylate for example is used as a selective carbonyl condensing agent. Three synthesis routes was proposed based on literatures and comprehensive comparison with other ways. First,Magnesium methylate is prepared by reacting magnesium metal with dry methanol.The magnesium salts of"higher"primary alcohols,i.e.alcohols with ≥ 2 carbon atoms,do not react directly with pure alcohols under normal conditions.In fact catalysts are required to set the reaction in motion and the preparation is performed under pressure at the higher temperatures.

一、直接合成法：本文将镁与无水甲醇直接反应制得甲醇镁；"更高级"的醇（比如C≥ 2的醇）在无催化剂的条件下无法直接和镁进行反应，本文以CCl4为催化剂将无水乙醇与镁直接反应制得乙醇镁，但是以原甲酸三乙酯为催化剂无水乙醇与镁无法反应；不论是以CCl4为催化剂还是以原甲酸三乙酯为催化剂，丙醇均无法与镁直接反应。

Magnesium methylate can be prepared by reacting magnesium with dry methanol; Primary alcoholates can be prepared by alcoholysis; the sterically demanding substituted magnesium alcoholates can be prepared by ester exchange or from dialkylmagnesiums.

综上所述，几乎所有的醇镁化合物都可以通过这三种方法进行制备：甲醇镁通过直接合成法制备；伯醇镁通过醇解法制备；仲醇镁或叔醇镁通过酯交换或烷基镁法制备。

Due to the ability of the bivalent magnesium cation to form stable chelate complexes with carbonyl compounds,magnesium methylate for example is used as a selective carbonyl condensing agent.Three synthesis routes was proposed based on literatures and comprehensive comparison with other ways.First,Magnesium methylate is prepared by reacting magnesium metal with dry methanol.The magnesium salts of higherprimary alcohols,i.e.alcohols with ≥ 2 carbon atoms,do not react directly with pure alcohols under normal conditions.In fact catalysts are required to set the reaction in motion and the preparation is performed under pressure at the higher temperatures.

一、直接合成法：本文将镁与无水甲醇直接反应制得甲醇镁；"更高级"的醇(比如C≥2的醇)在无催化剂的条件下无法直接和镁进行反应，本文以CCl_4为催化剂将无水乙醇与镁直接反应制得乙醇镁，但是以原甲酸三乙酯为催化剂无水乙醇与镁无法反应；不论是以CCl_4为催化剂还是以原甲酸三乙酯为催化剂，丙醇均无法与镁直接反应。

In this paper,by considering the characteristics of magnesium resources in salt lakes in China,the research progress in the preparation and utilization of magnesium hydroxide,magnesium oxide,magnesium metal and alloys,magnesium oxychloride cements,and ...

本文针对我国盐湖镁资源的特点，综述了和盐湖镁资源开发利用相关的氢氧化镁、氧化镁、金属镁、镁合金、氯氧镁水泥和镁质晶须的开发及研究进展，并对我国盐湖镁资源的开发利用提出了一些建议。

At first, the author clarifies the enterprise status which also is the status of the ordinary followers of Magnesium Ingot, the competitive participants of Magnesium Alloy, and the new comers of Magnesium Die-casting in the market through the analysis of the macro-circumstance, the current profession circumstance, the enterprise situation, the national and international magnesium markets, the enterprise objective market as well as the opponents, Secondly, the author draws the annalistic conclusions of the inner strategic conditions that the inner circumstance of Magnesium Ingot, Magnesium Alloy, the Magnesium Die-casting and the Reduction Can is in comparatively disadvantageous, advantageous, extremely advantageous and comparatively advantageous status respectively, Also, the author identifies the market orientation of the enterprise products based on the detailed market classification as well as the prediction of demand supply of the purpose, consuming areas and the varieties of Magnesium products.

首先，通过对企业所处的宏观环境、行业现状、企业状况，对国际、国内镁市场、企业目标市场和竞争对手的分析，明确了企业在市场中的地位，即镁锭的一般追随者、镁合金的竞争参与者、镁压铸件的新进入者的地位。运用产业结构分析理论、盈亏平衡分析技术、BCG矩阵进行分析，找出企业自身的优势和劣势，得出了内部战略条件的分析结果，即镁锭、镁合金、镁压铸件、还原罐的内部环境分别处于较为不利、有利、极为有利、较为有利的境地。

Second,the sterically demanding substituted magnesium alcoholates can be prepared from dialkylmagnesiums R_2Mg and alcohol.The main disadvantage of this synthesis route lies in the fact that relative expensive dialkyl magnesium compounds,such as Et_2Mg for example,have to be used as starting materials.For this problem,a convenient preparation route of pure dialkylmagnesium from a Grignard reagent.

二、烷基镁法：具有空间位阻效应的仲醇镁和叔醇镁可以直接用烷基镁R_2Mg和醇进行反应来制备，这条路线的主要缺点是烷基镁比较昂贵，为了解决这个问题，本文采用格式试剂来制备烷基镁，将制得的烷基镁与叔丁醇反应制得叔丁醇镁。

Anhydrous magnesium chloride is the raw material of electrolyzed metal magnesium and an important intermediate of some catalyzers or medicines.

氧化镁氯化转化是以菱镁矿、水镁石、氢氧化镁或氯化镁脱水产生的氧化镁为原料，分为气体介质中氧化镁的氯化和熔融盐介质中氧化镁的氯化。

In the first part,the uses and productions of metal Mg,sorel cement,Mg_2 fire retardant,light magnesium carbonate,light magnesium oxide and magnesium sulphate are described.

在镁资源综合利用方面着重介绍了金属镁的制取、镁水泥、氢氧化镁阻燃剂及轻质碳酸镁、轻质氧化镁、硫酸镁的制取与用途。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了