摘要
以宁夏盐池县青山矿区天然石膏矿石为原料,经过水热合成反应,成功制备出了长度达(155.6±62.5)μm,直径为(3.82±1.3)μm的半水硫酸钙晶须。结合XRD图谱、矿物文献,对比高纯生石膏中分别添加Fe~(3+)和Mg~(2+)后所得晶须的形貌,证实了宁夏天然石膏成分中Fe~(3+)、Al~(3+)等过量金属阳离子或为破坏石膏晶须品质的有害因素。随后验证了半水硫酸钙晶须经过300℃煅烧2 h,成为无水硫酸钙晶须的转变过程。
Using natural gypsum of Qingshan mining area in Yanchi as raw materials, by hydro thermal method, the hemihydrates calcium sulfate whiskers of(155.6±62.5)μm in length and(3.82±1.3) μm in diameter were prepared successfully.Combining historical documents, and XRD analysis, the sample's morphology was investigated. The results indicate that the excessive metal cation of Fe3+and Al3+is the main harmful factor to damage the quality of gypsum whisker in Ningxia natural gypsum. Insulation at 300 ℃ for 2 h in microwave high temperature furnace, the transformation process is validated of which the hemihydrates calcium sulfate whiskers turn into anhydrous calcium sulfate whisker of 167 μm in length.
引文
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