表面活性剂对多晶硅片线锯屑中泡沫浮选分离硅粉和碳化硅粉的影响研究(含任务书,开题报告,外文翻译,毕业论文8700字,答辩PPT)
摘 要
多年来，由于化石燃料逐渐耗竭的危机局面，以及对生态环境的保护意识的提高，深切感到能源可持续发展的迫切。人们普遍认为太阳能系列电池是当前最理想替代能源。回收线锯屑中的高纯硅，可以有效地降低光伏发电成本。多晶硅线锯切割过程中产生大量的切割废料。本文回顾了废料回收主要局限于回收硅和碳化硅的现状，然而废料中的硅具有更大的回收价值。本实验采用泡沫分离的方法达到提纯目的，实验结果表明：表面发泡剂不宜过多，分散剂效果不明显；取10g线锯屑废料样品（样品含硅量14%），HF酸处理样品后，加300ml去离子水，0.05g改性剂（十二烷基苯磺酸钠）、0.5g分散剂（六次偏磷酸钠）、80ml煤油为最佳方案，Si的纯度可达63.4%。
关键词： 线锯屑 ； 泡沫浮选； 硅； 六偏磷酸钠 ； 改性剂；氢氟酸
The Study of Effection the Surfactant Foam Flotation Separation of Si and SiC from Wire Sawdusts on the Polycrystalline Wafer
Abstract
Over the years, because of the gradual depletion of fossil fuel crisis situations, as well as people improving ecological and environmental protection awareness, deeply felt the urgency of sustainable energy development. It is widely believed solar cell is the best alternative energy sources at present. Recycling the high purity Si from wire sawdust, it can effectively reduce the cost of photovoltaic power. The current situation of recovering cutting slurry waste is reviewed in this paper. Most recovery methods only consider recovering Si and SiC, neglecting the more valuable silicon in the wire sawdust. In this study, I achieve purification purposes by the foam separation method. The experimental results show that: the surface foaming agent not be excessive; Take 10g wire sawdust samples (Sample silicon content 14%), handling with the sample by HF acid, then 300ml of deionized water, 0.05g fired agent(Sodium dodecylbenzenesulfonate), 0.5g dispersing agent(Six partial sodium), 80ml kerosene as the best solution, Si up to 63.4% purity.
Key words: wire sawdust; foam flotation; silicon; hexametaphosphate; Modifier;
hydrofluoric acid
目 录
摘 要 Ⅰ
Abstract Ⅱ
1.引言 1
1.1 选题的意义及依据 1
1.2 硅材料背景 1
1.3国内外的研究现状 3
1.4国内外市场分析 4
1.5 国内市场展望 5
2.实验 5
2.1实验原理泡沫浮选法 5
2.2实验仪器及样品 6
2.3实验方法 7
2.3.1线锯砂浆的预处理方法 7
2.3.2实验方案 7
2.3.3分析测试方法 8
3.实验结果与讨论 9
4.结论 12
参考文献 12
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