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Formation and prevention of scarring in the alumina production process

Author: LiangDaWei
Tutor: PengZhiHong；LiuXiangMin
School: Central South University
Course: Metallurgical Engineering
Keywords: Alumina production Scarring Scarring mechanism Descaling Antiscale
CLC: TF821
Type: Master's thesis
Year: 2005
Downloads: 197
Quote: 3
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Abstract


Scarring is the solid material in the alumina production process the wet production equipment and pipeline surface attached scarring problem is a major problem for the the long plagued alumina production. The presence of scarring seriously affect all aspects of alumina production: lead pipes get clogged, severely reducing the heat transfer coefficient of the heat exchanger, thereby reducing equipment capacity, increasing energy consumption, so that the increased cost of production. People have not effectively prevent scarring generated a large number of studies have targeted mitigation scarring generation speed and how to clear scarring. Papers in the study of alumina production system at home and abroad scarring problem dynamic do on the basis of a comprehensive understanding of the use of advanced testing instruments and test means different production processes scarring the Plains Branch alumina production systems, especially pipeline scarring has carried out a wide-scale screening and analysis; various scarring formation process, according to the analysis of their chemical composition and physical properties, the formation mechanism; alumina production process characteristics of the production process conditions and materials. composed of scarring formed; temperature, ore, lime, slurry flow rate and other factors scarred master alumina production system scarring characteristics, physical and chemical properties of the scarring of the law as well as throughout the scarring; focus on the mechanism of the formation and characteristics of the dissolution tube preheater, evaporator scarring. Through systematic theoretical study, field research and experimental studies investigated the high-pressure water removal method, ultrasonic descaling clear scarring and prevent scarring, to explore clear scarred effective way. Focus pipeline evaporation, dissolution, Bayer method original pulp, recycled water pipeline scarring removal method. Wherein a right the evaporator and dissolution sleeve preheater scarring purge tests made proved the evaporator and dissolution casing preheater scarring Clear suitable pickling method, and add Changxin inhibitor. Compared to the inhibitor and the industry is the use of corrosion inhibitors, if small and domestic inhibitor can reduce equipment corrosion rate 6-10 times more than 40% to extend the life of the evaporator, significant economic benefits. Prevent scarring, scarring characteristics of the different segments of the production, from the scarring mechanism operation run, technological innovation, and the addition of seed, ultrasonic anti-scaling a large number of analytical studies, suitable for different production processes slow the less scarring generate effective measures.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Light metal smelting > Aluminum
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