Extraction of the valuable substances from steelmaking slag in carbonic acid solution
| Project/Area Number |
20560692
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Metal making engineering
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
YOKOYAMA Seiji Toyohashi University of Technology, 大学院・工学研究科, 講師 (60191524)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 鉄鋼スラグ / 溶出 / 二酸化炭素 / 環境規制物質 / 電気炉酸化スラグ / 炭酸溶液 / 溶出試験 / 放物線則 / 直線則 / pH / スラグ / 炭酸 / クロム / 亜鉛 / セレン / 環境基準 / 人工海水 / 淡水 / 酸化鉄 |
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| Research Abstract |
Elution behavior of slags discharged from electric arc furnaces to the carbonic acid solution, which was weak acid, was investigated in order to extract the valuable substances included in the slags, The pH in the aqueous solution decreased with an increase of the partial pressure of carbon dioxide, Therefore, the elution of each substance of slag increased with the increase of the partial pressure of carbon dioxide. In the process of wet grinding of slag at atmospheric pressure of carbon dioxide, the recovery of zinc from the oxidizing and the reducing slag discharged from normal steelmaking process to the water solution was less than about 10%, whereas it for the oxidizing and the reducing slag discharged from smelting process of stainless steel was more than approximately 80%. The recovery of chromium during wet grinding was less than 1.4×10^<-4>%, and it was very small. Therefore, most chromium could be remained in the slags. Calcium carbonate was formed by the wet grinding of slag at atmospheric pressure of carbon dioxide, and it also formed in the water solution after tank leaching.
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Report
(4 results)
Research Products
(69 results)
