氧化铝厂设计冶冶金工程.doc

摘要
本设计的任务是设计年产量为75万吨的氧化铝生产车间。通过对国内外各种氧化铝生产工艺进行广泛深入的分析和对比,并根据本设计的具体条件,确立了本设计的工艺流程(拜耳法生产氧化铝)经过论证。确定了生产的工艺参数:分解溶液的配料比αk 为 , 精液碱浓度为 ;,溶出碱浓度为240 g/L;溶出温度 260℃,溶出赤泥 A/S=,N/S=,赤泥分离底流 L/S=,赤泥洗涤底流 L/S=。在以上参数的基础上确立了本设计的工艺流程:管道化—压煮器溶出→两次深锥赤泥沉降分离、四次深锥赤泥洗涤→二段晶种分解→流态化闪速焙烧→母液蒸发。其中,本次设计的重点是氧化铝生产车间设备连接图的绘制,图纸清晰准确的描绘出了氧化铝车间的设备情况。通过对经济技术指标的选择与论证,得出的本次设计的设计参数。同时,还进行了生产过程的物料平衡计算计算,。最后,针对氧化铝生产会产生的主要环境污染,制定了具体的处理措施,很好的满足的设计的要求。
关键字:氧化铝;拜尔法;赤泥;沉降
Abstract
The task is to design an output of 800 thousand tons of alumina refinery. Based on extensive analysis of the international and domestic alumina production technology and the specific requirements of the design, the production process (Bayer process) is established. The parameters of production process are obtained as fallowed: the αk , Nk of pregnant liquor is and g/l , respectively; the αk, Nk of spent liquor is and 240g/l,respectively;the digesting temperature is 260℃, the A/S of red mud is ,and N/S is ;the L/S of sedimentation red mud is ,and of the washing red mud. On the basis of the above parameters, the technology is established as fallowes: tube-autoclave digestion→two deep cone settling tank and four deep cone settling tank red mud sedimentation and washing→two-stage precipitation→fluidization flash calcination→vaporizing spent liquor. This design is the focus of the alumina production workshop equipment connection drawing . Draw a ton of finished products in the production of alumina cost is yuan . Finally, According to produce alumina production main environmental pollution , Make the concrete treatment measures , Good to meet the design requirements .
Key words :alumina; Bayer process; red mud; sedimentation
目录
摘要 I
Abstract II
目录 I
1 绪论 1
1
2
铝土矿资源概况 3
4
4
7
8
氧化铝厂设计的内容和意义 9
2 经济技术指标的选择与论证 11
常压预脱硅 11
苛性碱的加入方式 11