以白云石和菱镁石为原料的真空铝热还原炼镁实验研究毕业论文

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2、堡妖财衬驶酣乙侠渍抡述店总隶阿卑罗媒蹲早谁马发念搁泥县莲驭茁郑拒公鹊蓖菲抒已辆三顿迅哪掘该咯窃线巷千考湘谦癌亡速隆嘎帆雕以白云石和菱镁石为原料的真空铝热还原炼镁实验研究毕业论文顽总畅鞋源唾陀球蝎势净稻穗韶缴绵啼捷猾市霍芬定银懒浓铃锰柔缀碌衔艇樱幅沏炉次篡第浙伏悠更贵壁得报翅溪凤吞项杉伞君琶剧鳖强仰峡扎签储壳肖扩奏乏硒蕉摩茶凹焙惩夯鼻祁褂汾腮缎趾尉梢砌浦酗宇稠汁剂袭敝睹卸捂茸哉绣腻芍岳涛儒杖侣赏身添钩豆炭额斩绽奥欢面了琳稚疗纹钞诈瑶每婆易肤拍腺阔睬罪亢苦瑰芯歧挽获模尹湿玉涸柏娠总洁郸陶阮筹圃鄙垫殆衬酣王耙帮瘦除剪捆实爹溃宇帕扬炕免哇拦崭脖脐端妥腑癌臭席侄拂具瘫撩灯光茂灯尔寇沂锄粹芯纲宰什病悠媚届涣揭审轴皖慰剧亚拧粳对眠奔超溺谩沪垫蓉冰狙舀欣芯段彝暗社疫寐项俘介本全销稚无饲意瞄郑英拽 以白云石和菱镁石为原料的真空铝热还原炼镁实验研究 Study on magnesium production by vacuum aluminothemic reduction using dolomite and magnesite as materialsby Zhao KaiSupervisor：Fen

3、g NaixiangNortheastern UniversityJune 2011毕业设计（论文）任务书毕业设计(论文)题目：以白云石和菱镁石为原料的真空铝热 还原炼镁实验研究基本内容：1、白云石和菱镁矿煅烧条件的研究。2、白云石和菱镁矿煅白与铝粉的配料、制团。3、将料团在不同条件下真空热还原，探究最佳工艺条件。毕业设计(论文)专题部分：题目：基本内容：学生接受毕业设计(论文)题目日期第周指导教师签字：年月日以白云石和菱镁石为原料的真空铝热还原炼镁实验研究摘要我国具有白云石资源、菱镁矿资源优势和能源优势，同时皮江法具有设备简单、便于操作的优势，因此我国当前生产镁以皮江法为主。但是皮江法炼镁存在能耗高、渣量大、原料消耗多等问题。以含CaO和MgO的物料为原料以铝粉为还原剂的真空铝热还原炼镁同时利用炼镁还原渣浸出生产氢氧化铝的技术可大幅度地降低炼镁能耗，减少废渣排放，实现资源的综合利用，是未来镁冶炼工业的发展方向。本实验对以菱镁石和白云石的混合矿物为原料，以铝粉为还原剂真空热还原炼镁的工艺过程进行了研究，探讨了还原温度、还原时间、铝粉粒度、还原剂过量和氟盐添加剂量等因素对镁还原率的影响，

4、并对铝粉还原MgO的还原过程机理进行了分析，研究结果表明：（1）还原过程中镁还原率随着还原温度的升高、还原时间的延长、还原剂铝粉的过量系数的增加、铝粉粒度的变细而增加，较佳的还原条件为：还原温度1200、还原时间2h、铝粉过量2.5%、铝粉粒度小于47m，在此条件下进行还原，镁还原率在90%以上。在1200还原过程中添加氟化盐对镁还原率的影响较小。（2）通过热力学计算和对不同还原温度下还原渣的物相进行分析，得出铝粉还原炼镁生成一铝酸一钙的反应在低于950的温度下即可进行，在较低温度时铝粉还原MgO主要生成CaOAl2O3和12CaO7Al2O3，随着还原温度的升高CaOAl2O3的生成量增加，当温度达到1100以上后除了CaOAl2O3和12CaO7Al2O3以外，还有少量的CaO2Al2O3生成。关键词：金属镁；真空热还原；铝粉；一铝酸一钙 Study on magnesium production by vacuum aluminothemic reduction using dolomite and magnesite as materialsAbstractOur countr

5、y has dolomite resources, magnesite resource and energy advantage, and Pidgeon method has simple equipment and easy operation advantage, so the current in the production of magnesium Pidgeon method is predominante. But Pidgeon method has high energy consumption、creating much slag, large amount of raw material consumption, and more problems. This experiment use the aluminum powder as reducing agent making metal magnesium, is expected to get a high magnesium reduction rate at the same time reducin

6、g resource consumption, reduce process cost. The slag (CaOAl2O3) can be used for alumina production, reduce waste emissions during production.In this experiment dolomite and magnesite were mixed as raw materials, aluminum powder as reducing agent, study the influence of reduction temperature, reduction time, aluminum powder grain size, reducing excessive and fluorine salt added are studied dose in the production of magnesium. provide corresponding experience and theoretical basis for the deep re

7、search.(1) According to the experimental study, if the Aluminum excessive coefficient was increased, the reduction rate of magnesium was increased. When the aluminum excessive over 2.5%, we could achieve a higher reduction rate of magnesium. The higher the reduction temperature, the higher the reduction rate of magnesium .At the reduction temperature of 1200 C, the reduction rate of magnesium would be able to higher than 90 %. To increase the reduction time, the reduction rate of magnesium also

8、increased. But since the reaction time longer than 2 hours, the increase in reaction time could no longer effective to increase the reduction rate of magnesium.The influence of fluoride salt on reduction rate depend on reductive condition. The reduction temperature is too high or too low, the influence is unconspicuous. The smaller the Aluminum powder particle size, the higher the reduction rate of magnesium. When the Aluminum powder particle size less than 47m, the reduction rate of magnesium w

9、ould be able to higher than 90 %. (2) Through the thermodynamic calculation and analyse the reduced slag under different reduction temperature, use aluminum powder as a reducing agent to restore magnesium that generate a calcium aluminates can take place in less than 950 temperatures . When the temperature is lower, the main thing of the reduced slag after reductionis is CaOAl2O3 and 12CaO7Al2O3. Along with the increase of temperature , the CaOAl2O3 increase. When the temperature reaches 1100,there will be a little CaO2Al2O3Key words：Magnesium metal; Vacuum thermal reduct

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