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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/69109

    Title: 高濃度氫氟酸廢液回收製備氟化鈣之研究-以結晶矽太陽能電池廠為例;The Study of synthesis Calcium Fluoride Using The High-concentration Hydrofluoric Wastewater - A Case Study of Crystalline Silicon Solar Cells Factory
    Authors: 楊學明;Yang,Hsung-Ming
    Contributors: 環境工程研究所
    Keywords: 高濃度氫氟酸廢液;氫氧化鈣;碳酸鈣;氯化鈣;氟化鈣;the high concentration of HF wastewater;Calcium Hydroxide;Calcium Carbonate;Calcium Chloride;Calcium fluoride
    Date: 2015-07-21
    Issue Date: 2015-09-23 15:29:05 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本研究主要目的為探討結晶矽太陽能電池廠所產生的高濃度氫氟酸廢液,以氟化鈣製程進行研究,探討添加不同鈣鹽、pH值、加藥劑量等操作因子,對污泥中成份的影響,以提高污泥回收之效益。
    另因各實廠廢液因製程調整不同,廢液混酸成份亦不相同,經研究結果顯示,廢液中含有硫酸、二氧化矽成份,反應後會降低污泥中有效氟化鈣濃度。;The objectives of this thesis is to synthesis CaF2 using the high concentration of HF wastewater from the crystalline-silicon solar cells industry. The influences of the type of calcium, solution pH, and dosage on the composition of the recycled CaF2 were also investigated.
    The solution pH of the wastewater, which contained 16% HF, HNO3, HCl, and H2SO4, was lower than 0.1. The results showed that the recycled percentage of CaF2 is the highest (92.57%) when CaCl2 was added (Ca/F =1) at pH of 8. And the removal of F in all experiment was better than 99.9%. Besides, then Ca(OH)2 and CaCO3 were used, the recycle of CaF2 can be easily controlled by adjusting pH. When Ca(OH)2 was used, the chemical cost was the lowest. Though the reaction was exothermic, the operation is safe as long as the temperature was controlled below 80oC. Due to its low solubility, CaCO3 could not achieve high recycle percentage. Also, large amount of CO2 was produced. The recycled percentage was the highest when CaCl2 was used. However the quality of CaF2 is still not good enough. The adjustment of pH by NaOH also made the recycle of CaF2 by CaCl2 very expensive and not economic. In wastewater, other acids are usually present. The study also showed that when other acids are present in the wastewater, the amount of CaF2 would be reduced.
    Appears in Collections:[環境工程研究所 ] 博碩士論文

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