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题名	钾长石还原过程的研究
作者	郭峰
学位类别	硕士
答辩日期	1985-06-30
授予单位	中国科学院研究生院
导师	袁孝惇
中文摘要	为开发我国丰富的不溶性钾矿以弥补我国农业发展中钾肥的严重不足，进行了钾长石（K_2O·Al_2O_3·6SiO_2）还原过程的研究。考虑到高炉冶炼钾长石和用钾矿代替硅石作为助熔剂冶炼磷矿生产黄磷并付产钾肥等生产过程，对钾长石在 CaO 参加下的热分解和还原进行了热力学分析和动力学研究。研究结果表明钾长石的碳还原反应在 CaO参加下是近似一级反应，在0.7～1.5（CaO Wt.%/SiO_2 Wt.%）的碱度范围内还原反应处于浓度扩散控制，活化能约在30～40 KCAL/MOL，并结合还原过程中物料的差热分析和 x－射线分析，提出了还原过程的可能机制。此外，还考察了添加剂对钾长石还原的影响，MgO、CaF_2、CaCl_2、Fe_2O_3 在实验范围内的影响是显著的，但 P_2O_5的影响不显著。测定了还原过程中物料的熔点及粘度变化。最后，对闻喜小高炉冶炼钾长石的生产过程进行了分析，指出了提高钾还原挥发率和生产经济效益的途径。
英文摘要	In this paper, the thermodynamics and kinetics for potash feldspar pyrolyzing and reducing by carbon in the presence of CaO, in consideration of blast furnace and other industrial processes, have been studied in order to exploit insoluble potash ore to improve seriour lack of our potash fertilizer. The first order and diffuse-control reductive reaction was obtained from the experiments in the basicity (CaO Wt.%/SiO_2 Wt.%) of 0.7-1.5, with activation energy of 30-40 Kca mol, and the DTA's and X-ray powder diffractions of the residue in reductive process were determined, which results in a possible mechanism for the reaction. The reducibility of potassium was evidently promoted by addition of MgO, CaF_2, CaCl_2, Fe_2O_3 etc., but slightly by P_2O_5, and the melting points, viscosities of the residue in the reductive process were measured for finding the optimal operation conditions. Finally, the process of extracting potassium from potash felds with the small blast furnace at Wenxi county was analysed and the way for increasing volatility of potassium and economic effect were suggested.
语种	中文
公开日期	2013-09-27
页码	83
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/2062]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 GB/T 7714	郭峰. 钾长石还原过程的研究[D]. 中国科学院研究生院. 1985.

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