Separation of Fine Al 2 O 3 Inclusion from Liquid Steel with Super Gravity
- PDF / 2,254,988 Bytes
- 8 Pages / 593.972 x 792 pts Page_size
- 82 Downloads / 182 Views
ON
WITH the growth in demand for high-quality steel, the smelting of high-cleanliness steels is becoming increasingly important. And nonmetallic inclusion is one of the important factors affecting the purity of steel, whose presence in steel products has previously been demonstrated to have an adverse influence on the mechanical property,[1] surface quality,[2] fatigue property,[3,4] etc. What is worse, it is difficult to remove the micro- and/or nano-sized nonmetallic inclusion from the liquid steel as a result of the fine dispersed distribution. Therefore, effective separation of nonmetallic inclusions is essential for preparing of high-quality steel. The pursuit of high-cleanliness steels motivates the search for technologies to remove inclusions from liquid steel. The currently used methods within the industry include gas stirring,[5] ceramic filter,[6] bubbling,[7] and electromagnetic purification.[8,9] Generally these methods are effective at removing inclusions of a large size, but the removal efficiency of fine inclusions, particularly those with a similar density to liquid metal, is limited. Therefore, a more effective method for the removal of inclusions of a fine size is strongly desired. Higee technology, or super gravity, as one of the cutting-edge process intensification technologies, was originally proposed in 1979.[10] Because of its advantages of higher efficiency and free pollution, the CHONG LI, JINTAO GAO, ZHE WANG, and ZHANCHENG GUO are with the State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 100083 Beijing, P.R. China. Contact e-mail: [email protected] Manuscript submitted August 19, 2016. Article published online January 25, 2017. 900—VOLUME 48B, APRIL 2017
applications have been extensively investigated in the chemical process industry[11–13] and electrochemical field.[14,15] In recent years, with the development of technology and the increasing attention paid to super gravity, super-gravity technology has been gradually used to separate the high-temperature melt in the metallurgical field. For example, a phosphorus-enriched phase was successfully enriched and separated by super gravity from a steelmaking slag melt as a result of their density difference.[16] Gao et al.[17–20] studied the concentration and separation of valuable elements from different slags by super gravity, and the recovery ratios of valuable elements were pretty remarkable. Zhao et al.[21] studied the removal of impurity elements from aluminum melt with super gravity, which make impurity elements Fe and Si segregating at the two ends of the sample along the direction of super gravity, respectively. In addition, Song et al.[22] studied the super-gravity separation of nonmetallic inclusions from the aluminum melt, and the effect of super gravity on removal ratio and moving behavior of nonmetallic inclusions was discussed, which proved the feasibility for removal of inclusions in molten metal by super gravity. Inspired by this successful application of super-gravity technology, it would be possible t
Data Loading...
