Preparation of Active Absorbent for Dry-Type Flue Gas Desulfurization from Calcium Oxide, Coal Fly Ash, and Gypsum

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• 作者：Tomohiro Ishizuka ; Hiroaki Tsuchiai ; Takeshi Murayama ; Tsunehiro Tanaka ; and Hideshi Hattori
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：May 2000
• 年：2000
• 卷：39
• 期：5
• 页码：1390 - 1396
• 全文大小：264K
• 年卷期：v.39,no.5(May 2000)
• ISSN：1520-5045

文摘

As compared to a commercial absorbent prepared from Ca(OH)₂, gypsum (CaSO₄) and coal flyash, an absorbent prepared by use of CaO in place of Ca(OH)₂, exhibited a higher activity fordry-type flue gas desulfurization . The order of the addition of the raw materials in the slakingprocedure has much effect on the activity of the resulting absorbent. The activity of the absorbentincreased further upon hydrothermal treatment following the kneading procedure. The periodof hydrothermal treatment was reduced to 3 h to attain the activity which exceeds 20% of theactivity of the commercial absorbent which requires an optimum hydrothermal treatment periodof 10 h. The activity enhancement by use of CaO is considered to result from exothermic heatof slaking CaO. At a high temperature, the reaction of CaO with a SiO₂ component included inthe coal fly ash facilitates the formation of calcium silicate. The formation of calcium silicatewas suppressed by the existence of CaSO₄ in the slaking procedure.