氧化铝烧结法工艺改为低温拜耳法工艺的工业实践.pdf

A thesis submitted to
Zhengzhou University
for the degree of Master
The Practice of the Sintering Method Replaced by Low
Temperature Bayer Method for the Alumina Production Process
By Kai Tang
School Supervisor: Associate Prof. Zili Zhan
Major: Chemical Engineering
The professional degree: Master of Engineering
School of Chemical Engineering and Energy
May,2012
Y2104142
学位论文原创性声明
本人郑重声明:所呈交的学位论文,是本人在导师的指导下,独立进行研
究所取得的成果。除文中已经注明引用的内容外,本论文不包含任何其他个人
或集体已经发表或撰写过的科研成果。对本文的研究作出重要贡献的个人和集
体,均已在文中以明确方式标明。本声明的法律责任由本人承担。
学位论文作者:唐
目期:202年9月日
学位论文使用授权声明
本人在导师指导下完成的论文及相关的职务作品,知识产权归属郑州大学。
根据郑州大学有关保留、使用学位论文的规定,同意学校保留或向国家有关部
门或机构送交论文的复印件和电子版,允许论文被查阅和借阅;本人授权郑州
大学可以将本学位论文的全部或部分编入有关数据库进行检索,可以采用影印、
缩印或者其他复制手段保存论文和汇编本学位论文。本人离校后发表、使用学
位论文或与该学位论文直接相关的学术论文或成果时,第一署名单位仍然为郑
州大学。保密论文在解密后应遵守此规定。
学位论文作者:
日期:102年5月29日
摘要
摘要
金属铝及其合金具有许多优良的性能,其产量仅次于钢铁,并占据有色金
属产量的首位。随着铝行业的兴旺,作为生产金属铝原料的氧化铝工业近年来
蓬勃发展,竞争日趋激烈。如何在激烈的竞争中节约成本,增加效益,是摆在
每个氧化铝企业面前的重要问题。氧化铝烧结法生产工艺具有可以处理中低品
位铝土矿的优点,但同时有流程长、能耗高、成本高等显著缺点,成本难以创
造效益,必须进行改造。
本文分析了10万吨/年产量烧结法生产氧化铝装置的利弊,讨论了烧结法
生产氧化铝工艺改造为低温拜耳法氧化铝生产工艺的可行性,同时对改造的工
业化实践及其结果进行了研究。以进口三水铝石型铝土矿为原料,利用烧结法
溶出及中压脱硅系统可以满足低温拜耳法所需的低温(140-145℃)溶出工艺的
特点,采用烧结法工艺的基本设备进行适当改造,同时建设新槽体和管道来增
大系统总液量和流量以确保产能,将氧化铝烧结法工艺改造成低温拜耳法工艺,
缩短了流程,降低了能耗,平均旽氧化铝降低成本约400元。对原料磨生产优
化以及利用改造后闲置设备对矿浆磨制系统优化进行了深入研究,改造矿浆磨
制电耗降低了1.01度电/立方矿浆。
关键词:氧化铝烧结法低温拜耳法改造原料磨节能
Abstract
Abstract
Aluminum and its alloys have many excellent properties, Its output second only
to iron and steel and occupy the top of the non-ferrous metal production. As the boom
in the aluminum industry, Alumina which is raw materials of aluminum is booming
Alumina industry competitive is very fierce. How to reduce costs is thinked by every
alumina enterprise Sintering method alumina production have a good characteristic. It is good
to Treatment of low grade bauxite. But it have same bad characteristics. ]t have a long
technological process, not energy saving, and high-cost. The cost can not create benefit, so it must
be changed.
The thesis study on the pros and cons in annual yield 100000t of sintering method
alumina production plant And study on the feasibility for the sintering method production
process transformation to become the low temperature by Bayer production process. As the same
time, Study on the indus ia practics and heir resul s of the transformation. With the imports of
bauxite gibbsite, the low temperature by Bayer produce the alumina in low
temperature(140-145) The stripping system and the silicon removing system of the sintering
method alumina production can meet the requirements of temperature. So, use the equipment of
sinering method alumina production to produce alumina in low temperature by Bayer
transformation with some reform. At the same time construct some troughs and
conduits to increase the material flow and prolong the residence time of materials
After the reform, the cost is drop about 400 yuan. Raw material mill production optimization and
use of idle equipment are in-depth studied. Modification of better achievements in energy saving
and consumption reducing of raw material mill. After the reform, the cost of the pulp milling is
drop about 1.01 degree per cubic pul