Prof. Syd S. Peng
West Virginia Uni., USA

NOV 18, 2019 
9:00-9:40 AM

Automation of Longwall Mining

Dr. Syd S. Peng is Charles E Lawall Chair of Mining Engineering emeritus, Department of Mining Engineering, West Virginia University, Morgantown, WV, U.S.A. Dr. Peng received his undergraduate diploma in mining engineering from National Taipei University of Technology in Taiwan. He went to the U.S. in 1965 for advanced study and received his Ph.D. in mining engineering from Stanford University in 1970. From 1970 to 1974, he worked for the U.S. Bureau of Mines, Twin Cities Research Center in charge of rock physics research. He joined West Virginia University in 1974. In 1978 he was appointed as chairman of the Mining Engineering Department, a position he held until September 2006.

In 1985, he established the Longwall Mining and Ground Control Research Center and assumed its directorship. In 1998, he was appointed director of West Virginia Coal and Energy Research Bureau. He has supervised more than 100 research projects with more than US$12 million from government and private sources. He has performed research in more than 300 mines in coal and industrial minerals in all US mineral producing states and 16 foreign countries.

He has successfully supervised 38 PhD dissertations and 47 MS thesis. He has authored and co-authored 6 textbooks and 357 journal and proceedings articles in the areas of longwall mining, ground control and respirable dust. He initiated and organized the annual international conference on ground control in mining (ICGCM) in 1981 and served as editor/senior editor of the Conference proceedings. It is now recognized all over the world as the annual forum for exchange of information on ground control.

He is frequently invited to lecture or chair conference sessions in the U.S. and all major coal producing countries. He is a member of the National Academy of Engineering and was the recipient of 20 regional, national and international awards.

NOV 18, 2019 
10:10-10:50 AM

Extract of P and Mn
from Steelmaking Slag

 Steelmaking slag contains considerable amount of Mn and P, and in Japan, for resource security, the recycling them is an important issue. Since Mn is an alloy added to enhance the steel quality, while P is a harmful impurity in the steel product, they need to be separated for recycling. For this purpose, two principles are considerable. One is to use the different property of each mineralogical phase in slag, and the other is to use the different thermodynamic property of each element in slag.

 In steelmaking slag, P is enriched in the dicalcium silicate phase (C₂S) and form the solid solution with tricalcium phosphate (C₃P). As the solubility of this phase to the aqueous solution is widely different from that of other phases in slag, we have proposed the leaching treatment to separate C₂S-C₃P phase from slag. The dissolution ratio of P from the synthesized slag has reached about 91%. After the separation of residue, pH of the leachate increased to precipitate phosphate. 80% or more of the P in the leachate was precipitated and the phosphate content of the precipitate was about 25% after calcination.  

 The reduction of steelmaking slag was conducted by many researchers to recover Fe and P. However, by the simple reduction, Mn was also reduced and the product of C saturated iron with high content of Mn and P is hard to reuse. In thermodynamics, MnO is basic oxide but P₂O₅ is acid oxide, and the temperature dependences of the equilibrium constants of their reduction reactions are widely different. We have already found the possibility of separating Mn and P from steelmaking slag by selectively reducing P₂O₅ and FeO while suppressing the reduction of MnO. By the fundamental study, it was found that a decrease in slag basicity suppressed the reduction rate of Mn while enhancing that of P. To analyze this result, the activity coefficients of both Mn and P in the Fe-P-Mn-C(sat.) alloy (2.5–15.2 mass% of P and 2.9–12.8 mass% of Mn), which is obtained by the reduction of steelmaking slag were investigated. A comparison with the results obtained by reduction experiment indicated that the activity coefficients of P and Mn obtained in the study were applicable.

 Prof. Jien-Wei Yeh
 Tsing Hua Uni., Taiwan

 CV

NOV 19, 2019 
9:10-9:50 AM

High-Entropy Materials and
Their Applications

ArcelorMittal USA

NOV 18, 2019 
10:50-11:30 AM

Sustainable Development of
Automotive Steels 

Sustainable Development of Automotive Steels

Production of motor vehicle in China has grown from 5% of the world production in 2001 to 30% in 2016.  ArcelorMittal produced over 17 million tons of steel for the automotive industry worldwide.  ArcelorMittal Global R&D with 1,500 full time researchers focused on the innovation of automotive steel development and its applications.  Since June 2014, ArcelorMittal has successfully launched a joint venture (Valin ArcelorMittal Automotive Co.) in Hunan, China with a capacity of 1.5 million tons per annual.  A clean steel platform has been established which helps to stabilize the production of high-quality automotive steel.  The origin of sliver was identified as alumina, spinel and calcium aluminates from the deoxidation and re-oxidation products, mold powder entrainment, argon bubbles and other mechanically induced defects.  Systematic analyses of the sliver defects and countermeasures taken at steelmaking and continuous casting have greatly improved the steel surface quality downstream.  Sustainable growth of steel industry in the future is built on low carbon, clean air and a circular economy.  For the sustainable development of automotive steels, ArcelorMittal has initiated the S-in motion which provided solutions to reduce car weight by using hot stamped parts and laser welded blanks at the same cost with better safety.  The lightest BiW, hang-on parts and chassis have resulted in a weight reduction of 16% in the C-class vehicle.  Saving of 73 kg for the whole vehicle induces a reduction of 6.23-gram CO₂/km during its life cycle.

NOV 19, 2019 
8:30-9:10 AM

Characterization of Gas-Hydrate and
Free-Gas around Japanese Island