以萃取劑改質樹脂自含鎵之鹽酸浸漬液中回收鎵之模擬研究

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题名:	以萃取劑改質樹脂自含鎵之鹽酸浸漬液中回收鎵之模擬研究
作者:	李芍樺;Lee, Shao-Hua
贡献者:	化學工程與材料工程學系
关键词:	離子交換;鎵回收;Aspen Chromatography;Ion-exchange;Ga recovery;Aspen Chromatography
日期:	2020-01-17
上传时间:	2020-06-05 17:04:00 (UTC+8)
出版者:	國立中央大學
摘要:	隨著半導體產業的蓬勃發展，產生許多電子工業廢棄物如含氮化鎵發光二極體(LED)廢晶圓，由於國內對於鎵金屬回收技術尚不足，且對鎵資源的缺乏，本模擬研究探討如何從含鎵廢料中回收鎵。本研究以萃取劑改質樹脂(D2EHPA/ XAD-4)進行浸漬液中鎵離子之離子交換以回收鎵。模擬採用Aspen Plus之Chromatography模組進行研究開發，以Extended Langmuir Isotherm描述其等溫平衡吸附曲線，再以固相Linear Lumped Resistance質傳阻力模型描述其吸附質傳阻力，因平衡吸附量測實驗與連續管柱實驗之操作方式不同，會影響其吸附效率，故以動力學實驗數據先行概估吸附量修正因子(fads)之大約數值。再以模擬分別驗證純鎵離子溶液、純鋁離子溶液、純鎵離子加純鋁離子混合溶液、與實際浸漬廢料稀釋溶液實驗數據，求得符合程度最佳之各離子吸脫附質傳係數(MTC)與吸附量修正因子(fads)，以確認程式及參數的可靠度。接著探討離子交換循環操作程序之各項變因對其鋁對鎵之重量比(Al/ Ga wt. ratio)及鎵回收率的影響，研究最適化的操作條件，以獲得低鋁對鎵之重量比與高鎵回收率。變因探討後得操作條件為吸附步驟時間240分鐘、脫附步驟時間2010分鐘、吸附步驟流量0.002 L/ min、脫附步驟流量0.002 L/ min、離子交換塔塔徑1.6公分與填充樹脂高度10公分。此操作條件下可得鋁對鎵之重量比為0.679%，鎵回收率達82.67%。 ;With the advance of semi-conductor industry, a great amount of industrial waste material, such as scraped GaN-containing wafer, has been produced. Due to the shortage of Ga resources and the lack of ability to recycle Ga metal, the Ga recycling simulation had been developed in this study. In this work, extractant-modified resin (D2EHPA/ XAD-4) had been used to recycle Ga ions in the ion exchanging process. The Chromatography module of Aspen Plus software was adopted in this research. The isothermal adsorption curve was fitted by extended Langmuir isotherm model while adsorption mass transfer resistance was modeled by Linear Lumped Resistance model. Due to the difference of operating method between isothermal adsorption experiments and ion exchange experiments which may affect the adsorption efficiency, the adsorption correction factor, fads, was estimated by the data of dynamics experiments in advance. The simulation of ion exchange experiments of pure Ga3+ solution, pure Al3+ solution, mixture of Ga3+ and Al3+ solution, and real waste dilute solution have been developed and fitted to the experimental data. The simulating program and parameters can be verified by the corresponding mass transfer coefficient and adsorption correction factor of the adsorption mentioned above. In order to obtain lower Al to Ga weight ratio and higher Ga recovery, several variables were discussed to find the best operating conditions. The finial operating conditions are adsorption step time 240 min, desorption step time 2010 min, adsorption flow rate 0.002 L/min, desorption flow rate 0.002 L/ min, bed diameter 1.6 cm, and height of resin layer 10 cm. The simulation results are 0.679% Al to Ga wt. ratio and 82.67% Ga recovery.
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