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题名	亚熔盐钛铬清洁生产工艺流程模拟
作者	王兵
学位类别	硕士
答辩日期	2008-05-29
授予单位	中国科学院过程工程研究所
授予地点	过程工程研究所
导师	齐涛
关键词	钛白 铬盐 亚熔盐 热力学 流程模拟
其他题名	Process Simulation on the Clean Production of Titanium White and Chromates by Sub-Molten Salt Technology
学位专业	化学工艺
中文摘要	钛白和铬盐均是重要的化工冶金产品。目前钛白的生产方法主要有硫酸法和氯化法，铬盐的生产方法主要有传统的高温焙烧工艺，均生产大量废渣，资源利用率低，污染严重。中国科学院过程工程研究所开拓了亚熔盐铬化工清洁生产新工艺，将反应温度大幅降低，铬回收率提高到99%以上，并通过产业链接实现铬渣的零排放，已经工业化，处在需要进行系统分析并进行技术集成的关键时期。在此平台技术基础上，又开发了亚熔盐钛白清洁生产工艺，在实验室进行了大量探索实验，积累了宝贵的基础数据，需要进一步放大以满足工业化的需要。在这个阶段，流程模拟技术可以很好地辅助完成工艺系统集成和放大的任务。本文在实验数据和中试运行参数的基础上，模拟了亚熔盐平台上两新工艺的流程，主要进展如下： (1)在汇总文献报道的无机物及冶金体系热力学物性预测方法的基础上，优化了可估算本工艺组分热力学物性的基团贡献法参数； (2)基础热力学分析表明，电解质组分在水溶液中的两种热力学现象溶解热和稀释热(或浓缩热)对体系的成分分布和能量变化均有影响，对KOH介质，相比于其稀释热(或浓缩热)的数值，其溶解热对体系的影响更加显著，这不仅体现在KOH溶解过程放出热量对体系温度的影响，同时溶解过程使得KOH电解质由纯固态向离子态转变，体系组成发生了变化。模拟中以PGM语言编程实现了对溶解反应的有机控制，合理地处理了溶解过程对工艺物流和单元操作的影响； (3)热力学计算表明，亚熔盐钛白清洁生产工艺的核心反应均是强放热反应，这在一定程度上降低了工艺体系对能量的消耗，同时也增加了反应器温度控制的难度； (4)通过对亚熔盐钛白清洁生产工艺的流程模拟，得到了详细的物流表和单元操作表，每吨产品的原料消耗和能量消耗，指出了工艺的能量消耗主要在原料预热和碱液回收，为下一步工艺的改进和优化指出了方向； (5)以SysCAD为流程模拟平台，对亚熔盐铬清洁生产工艺的流程模拟结果基本上符合工业实际情况，在进一步完善基础数据和模拟机理后，模拟工作将会对工艺放大产生积极作用。
英文摘要	Both titanium white and chromate are important metallurgical product. At present, the widely used technologies for the production of titanium white are sulphate route and chloride route which produce large amounts of wastes, toxic byproducts and pollute the environment seriously. The conventional chromate production process brought the chromate industry the same embarrassed condition. Institute of Process Engineering, Chinese Academy of Sciences has recently proposed and developed a novel cleaner chromate manufacturing process(sub-molten salt process), which decreased the reaction temperature significantly and improved the chromite utilization efficiency sharply. The industrialization of sub-molten salt chromate process has been completed, and it is at the critical point of system integration. On the basis of sub-molten salt technology, a clean titanium white process has been developed with a number of process data accumulated in the lab, which faces the challenge of pilot test. For both titanium white and chromate process, simulation technology could contribute a lot to the system integration and scale-up. In the present paper, the two processes above was simulated and analyzed. The research results are summarized as follows: (1) Optimized the parameters of a thermodynamic group contribution method for the prediction of the property of inorganic bioxide, based on a summary of estimation method for metallurgical system in reports; (2) Thermodynamics study shows: both heat of solution and heat of dilution contribute to the components distribution and energy alteration of aqueous system. For KOH medium, its heat of solution makes more effect on the aqueous stream and unit operation. In simulation, the dissolving process of KOH was controlled properly by PGM language programming, which makes the effect of dissolving process on energy and components rational. (3) Thermodynamic calculation shows: the two key reactions in sub-molten salt process of titanium white are both exothermal, which reduce the energy consumption and increase the difficulty in reactor control. (4) Specified stream and unit operation tables were obtained by process simulation. The results show that feed preheating and alkali solution recycling consume the most of energy and should be further optimized. (5) The simulation result agreed with the data of chromate pilot test of sub-molten salt process. It will make positive contributions to process integration.
语种	中文
公开日期	2013-09-13
页码	101
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/1220]
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	王兵. 亚熔盐钛铬清洁生产工艺流程模拟[D]. 过程工程研究所. 中国科学院过程工程研究所. 2008.

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