| Project/Area Number |
07555614
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
資源開発工学
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| Research Institution | Waseda University |
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Principal Investigator |
HARADA Taneomi Waseda Univ., School of Sci & Eng., Professor, 理工学部, 教授 (80063337)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAZAKI Atsushi Waseda Univ., School of Sci & Eng., Professor, 理工学部, 助教授 (70200649)
OWADA Shuji Waseda Univ., School of Sci & Eng., Professor, 理工学部, 教授 (60169084)
大木 達也 工業技術院資源環境技術総合研究所, 素材資源部, 研究官 (80257211)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Coal / Flotation / Caustic Leaching / Deashing / Desulfulization / Maceral / 石炭の高度脱硫術 / 石炭の高度脱灰技術 / 石炭の浮選 / 石炭の物理的クリーニング / 石炭の化学的クリーニング / コールクリーニング / 石炭中の硫化鉄 / 石炭の灰分 |
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| Research Abstract |
Two kinds of coal cleaning methods were applied to the Illinois No.2 and No.6 coals, which were 1. flotation as major physical cleaning method and 2. aqueous caustic leaching (ACL) and molten caustic leaching (MCL) as chemical cleaning methods. The objective of this study is to clarify the limit of flotation and the reaction mechanism of ACL and MCL.The major results obtained are summarized as follows ;
1. Ash and sulfur rejection by flotation
Normal flotation was applied to the Illinois No.2 coal with the addition of potassium chromate and iron oxidation bacteria and changing conditioning pH to depress iron sulfide minerals. 60-70% of ash rejection, 70-75% sulfur rejection was obtained with 40-45% recovery of coal substances. Bacteria treatment could achieve higher coal substance recovery but with relatively lower ash and sulfur rejection.
Reverse flotation was applied to the Illinois No.6 coal which was very low floatability of coal substance. The cleaning results were 25% ash rejection, 38% sulfur rejection and 89% coal substance recovery. Searching relationship between the libeation of iron sulfide minerals and flotation behavior, it was demonstrated that the particles with the ratio of lower than 30% of iron sulfide minerals were difficult to be floated.
2. Ash and sulfur rejection by ACL and MCL
ACL was applied to the Illinois No.6 coal with NaOH,to obtain the result of 88.8% ash rejection, 28.6% sulfur rejection and 90.4% coal substance recovery. 94.9% ash rejection, 91.4% sulfur rejection and 73.0% coal substance recovery was obtained by the MCL with alkali of NaOH/KOH=3/1.
The recovery of each maceral group in the stage of MCL were calculated to 98% of vitrodetrinite+exinite, 67% of inertinite and 58% of telinite+collinite.
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