本研究利用離子交換樹脂和萃取劑,嘗試從工廠清洗氮化鎵生產設備時所排出的廢液中,將其中所含的鎵分離與純化出來。 根據實驗結果,實驗中所嘗試的陰離子樹脂、兩性樹脂以及鹼性萃取劑,除了PD樹脂以外,對於在鹼性環境下,分離鎵的效果並不是很好;而使用PD樹脂可在鹼性環境下,有效分離鎵,對鎵吸附率達到98%。 脫附方面,利用鹽酸加入少許脫附劑,可以將鎵從樹脂上脫附出來,當鹽酸濃度>9%時,至少有80%以上的脫附率。 脫附下來的含鎵溶液,調整其pH值即可使鎵沉澱出來,當pH在4左右時,鎵接近完全沉澱,將沉澱下來的鎵於900℃進行煅燒四小時,即可以獲得氧化鎵。 氧化鎵重新溶回王水中,進行濃度測試,還原出來氧化鎵鎵純度達99.97%。 最佳操作為:樹脂與廢液的量比為1:10的情況進行吸附;使用鹽酸加入少許脫附劑,與樹脂量比為1:5進行脫附; 於900℃下鍛燒沉澱物,可得純度99.97%之氧化鎵。
In this study, we use ion exchange resin and extractant to try to separate and purify gallium from gallium nitride liquid waste. The results of experiments show that: in high pH, all of ion exchange resin and extractant we use in the experiments is useless except resinX ; We use resinX to adsorb, gallium can be removed 98% from the waste. About desorption, we use hydrochloric acid by adding some desorption agent, gallium can be desorbed from resinX. When the hydrochloric acid concentration is more than 9%, at least more than 80% of the gallium can be desorbed. Desorption of gallium-containing solution to adjust the pH to make gallium precipitates out, when the pH is about 4, gallium close to completely precipitation. Precipitation of gallium calcined for four hours at 900 ° C, can get gallium oxide. Finally, the gallium oxide dissolved back to the aqua regia, analysis of the solution by inductively coupled plasma, shows the gallium purity of 99.97%.