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| 題 名 | Investigation of the Reaction of Roasted Serpentine Ore with Some Ammonium Salts |
|---|---|
| 作 者 | Abd-Elzaher,Mokhles M.; | 書刊名 | Journal of the Chinese Chemical Society |
| 卷 期 | 46:6 1999.12[民88.12] |
| 頁 次 | 頁975-982 |
| 分類號 | 346.06 |
| 關鍵詞 | 硫酸銨; Serpentine; Ammonium sulfate; Ammonium chloride; Thermal analysis; |
| 語 文 | 英文(English) |
| 英文摘要 | The reaction between roasted serpentine ore and ammonium sulfate was studied at the range of temperature 250-1000℃ using different molar ratios to determine the maximum extraction of magnesia and also to characterize the different reaction products. The maximum extraction of MgO from the roasted ore reached 92.4% at 400 ℃. It was found from XRD that ammonium magnesium sulfate [(NH□)□Mg□(SO□)□] was produced as the main product at 400℃, which decomposes to magnesium sulfate at 500-600℃. The last compound decomposes to magnesium oxide at 900-1000℃. Thermal analysis of the reaction mixture confirmed the results obtained by XRD. Extraction of magnesia by ammonium chloride at 300-400℃ showed low percentage of extraction (78%). Comparison was made between using ammonium chloride instead of sulfate taking into consideration the thermal decomposition products of both ammonium salts. Extraction of magnesia from the roasted ore by aqueous ammonium sulfate or ammonium chloride showed good results. |
本系統中英文摘要資訊取自各篇刊載內容。