微波碳熱法於氧化鎳與汙泥之鎳還原研究

本研究將氧化鎳與活性碳粉做一定比例的混合，採用碳熱還原法將氧化鎳還原成鎳，並以微波加熱技術取代傳統高溫爐達到快速升溫的效果，進而探討碳與氧化鎳在不同比例、不同的微波功率及時間變化下，鎳金屬的還原率在怎樣參數才能達到最高。實驗結果顯示:在調整碳粉比例由1至2.5及微波功率由5kw至10kw的實驗過程中，發現氧化鎳與碳粉的莫耳比(molar ratio)在1:2的比例下使用6KW的功率加熱20分鐘，可以得到還原率最高的96.21%；故而功率的升高與碳粉的增加是能夠有效的加快升溫的速度，過多的碳粉也會使較高功率參數會有較好的還原率。在確定較好的比例參數後，接著調整不同的時間變化；在不同功率6~10kw間，將原有的20分鐘加熱時間以5分鐘為基準上下調整，過程中發現，最好的三個參數條件為6kw25分鐘，其次為10kw15分鐘，最後為7kw25分鐘，還原率則分別為97.45%、97.39%、97.22%，三個數值都非常的接近。從實驗中得知，功率的提升是有助於升溫速度，亦可較快達到還原的溫度，所以功率越高時，到達較高還原率所需的實驗時間相對較少，而達還原溫度後就會快速地發生還原反應，達到良好的還原效果。微波加熱確實可以減少還原反應所需要的時間，透過搭配不一樣的功率與時間，可達到節省成本與能源的效果。

關鍵字

微波加熱；碳熱還原；氧化鎳；汙泥

並列摘要

In this study, nickel oxide and activated carbon powder mixed with a certain percentage, nickel oxide will be reduced to nickel with Carbothermal Reduction method. Also, microwave heating technology is used instead of traditional high-temperature furnace to achieve the effect of rapid heating. The purpose is to explore how high the reduction rate of nickel will be with the different parameters of the proportions between carbon and nickel oxide, different microwave power and varied time. The results shows, “during the experiment, adjusting the carbon proportion from 1 to 2.5 and the microwave power from 5 to 10kw, the reduction rate will reach the highest -96.21% with proper molar ratio of the nickel oxide and the carbon, which is 1:2, using 6kw-power in 20 minutes. Consequently, the increasing power and more carbon really effectively accelerate the speed of heating; excess carbon makes the high-power parameter a better reduction rate. Determining the good proportion of parameters, the different time change is proceeding. In the power from 6 to 10kw, making each 5-minute adjustment on the basis of previous 20 minutes, it is concluded that the best three parameter conditions are 6kw- 25 min, followed by 10kw-15min, and finally 7kw-25min, of which the reduction rates are 97.45%, 97.39%, and 97.22% respectively; The three numerical values are very close. Thus, the riseof the power is helpful for the speed of the heating rate so that the temperature of reduction is much sooner to be reached, so the higher power is, the less time it takes to get a higher reduction rate. When reaching the reduction temperature, the reduction reaction occurrs immediately to get a good reduction.

並列關鍵字

Microwave heating ； Carbothermal Reduction ； Nickel oxide ； Sludge

參考文獻

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微波碳熱法於氧化鎳與汙泥之鎳還原研究

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