カルシウム系廃棄物からの炭酸化抽出液の生成と脱硫特性 [in Japanese] Calcium Extraction from Calcium-Based Waste by Carbonation Reaction and Its SO_2 Absorption Characteristics [in Japanese]
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For the purpose of recovering calcium resource, an attempt was made to extract Ca<SUP>2+</SUP> by carbonation reaction from the calcium-based wastes such as limestone slurry, concrete waste and steel slag, and then the desulfurization characteristics of the Ca<SUP>2+</SUP> extracts obtained from these calcium-based wastes were investigated. The Ca<SUP>2+</SUP> extraction experiment was carried out in a hermetic vessel under the CO<SUB>2</SUB> pressure range of 0.10-2.00 MPa at the temperature range of 280-333 K.<BR>As a result, it was found that Ca<SUP>2+</SUP> extraction behaviors of limestone sludge and concrete waste were similar to that of limestone. However, the rate of Ca<SUP>2+</SUP> extraction from steel slag was about one-third of those from the other calcium-based wastes. By introducing SO<SUB>2</SUB> gas (1000 cm<SUP>3</SUP>·m<SUP>-3</SUP>) into the Ca<SUP>2+</SUP> extract, it was found that SO<SUB>2</SUB> absorption performance of the Ca<SUP>2+</SUP> extract of the calcium-based waste employed was almost the same to that of limestone slurry.
- Inorganic Materials
Inorganic Materials 14(326), 10-16, 2007-01-01
The Society of Inorganic Materials, Japan