需要金幣： 1000 個金幣 |
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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘 要:磁鐵粉是一種多功能磁性材料。本課題采用熱分解法制備磁鐵粉。研究了制備Fe(OH)3前驅(qū)體的不同制備方法與產(chǎn)品性狀的關(guān)系，幾種沉淀劑中以氨水沉淀制得的效果最好；研究了前驅(qū)體在木炭粉保護(hù)下在不同溫度下焙燒，二價(jià)和三價(jià)鐵的摩爾比，結(jié)果表明：650℃效果最佳；研究了焙燒時間對磁鐵粉產(chǎn)品質(zhì)量的影響，實(shí)驗(yàn)表明，2h為宜；研究了活性炭/鐵比例與產(chǎn)品質(zhì)量的關(guān)系。并研究了測定活性炭中二價(jià)鐵和三價(jià)鐵含量的方法，并用該方法檢測試驗(yàn)期間的產(chǎn)品質(zhì)量。本研究的工藝步驟是：使用氯化鐵溶液，在室溫下，用氨水為沉淀劑，控制PH為9，制得氫氧化鐵前驅(qū)體，經(jīng)干燥脫水，在木炭保護(hù)下，于650℃的馬弗爐中灼燒2h。檢測方法：鹽酸溶樣，重鉻酸鉀直接滴定測定二價(jià)鐵，另外取樣用鋅粉還原鐵后，再用重鉻酸鉀直接滴定測定總鐵量，同時測定活性炭對三價(jià)鐵的影響，扣除空白后，計(jì)算二價(jià)和三價(jià)鐵的摩爾比。 關(guān)鍵詞：氫氧化鐵；熱分解；四氧化三鐵；磁性；活性炭
ABSTRACT:The magnet powder is a kind of multi-functional magnetic materials. The magnetic activated carbon was prepared by thermal decomposition in this paper. The relationship of several method for preparation of Fe(OH)3 precursor with products property was studied, and the best effect of preparation of product was the method of addition of ammonia. The mole ratio of Fe2+ and Fe3+ in the products prepared by thermal decomposition, with charcoal powder on the mixture of precursor/activated carbon to protect oxidation, was studied. It was show that a good temperature is at 650℃. The effect of heat time to product quantity show that suitable the time is 2 hours. A method of determination of the content of Fe2+ and Fe3+ in the products was studied, had been used during our experiment. The method express follow: at room temperature, addition of ammonia to FeCl3 solution(pH=9) formed the Fe(OH)3 precursor, moved to crucible by drying on electric furnace, then covers a layer of charcoal powder on its surface and using the porcelain sheet to separate them, reaction in furnace at 650℃ for 2 h. The detection the content of iron in sample: addition of HCl to dissolve sample and addition of water to 100 mL (sign as SS)，one of sample solution taken from SS used to detect Fe2+ with the potassium chromate method, another of sample solution taken from SS used to detect content of total iron, addition of Zn powder to reduce Fe3+ to Fe2+, with the potassium chromate method, same time，detection of blank value of the activated carbon, calculation of mole ratio of Fe3+ and Fe2+. Keywords: hydrogen ferric oxide; thermal decomposition; ferroferric oxide ; magnetic; activated carbon |
