由集塵灰以固態反應法製備BaFe12O19及NiFe2O4

Preparation of BaFe12O19 and NiFe2O4 Magnets by Using Solid State Reaction Method from Electric Arc Furnace Dust

李國瑋(Kuo-Wei Lee)

指導教授 ： 王玉瑞

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2007年)

摘要

以碳熱還原法與鹼溶處理法將集塵灰中之鋅回收後所殘餘之物質主要以氧化鐵為主。本研究嘗試將集塵灰中的氧化鐵回收後，合成出BaFe12O19硬磁材料及NiFe2O4軟磁材料，探討燒結溫度、持溫時間及氧化物添加後的影響。研究結果顯示，添加BaO的樣品在經過950℃煆燒，持溫2小時後，可合成出BaFe12O19磁性材料。BaFe12O19陶瓷燒結溫度增加，其飽和磁化量(Ms)緩慢增加，矯頑磁力(Hc)則明顯降低。回收氧化鐵加入NiO，煆燒溫度在1200℃，持溫2~ 4小時可合成NiFe2O4。結果顯示:隨著NiO添加量增加，燒結NiFe2O4陶瓷之飽和磁化量(Ms)及矯頑磁力(Hc)都呈現緩慢增加。

關鍵字

煉鋼集塵灰 ； 磁性 ； 碳熱還原法 ； 鹼溶處理法

並列摘要

After Zinc is recovered from EAFD, the residual composition is maily iron oxide,Fe3O4. According to the various treatment processes, the disposal of iron oxide could have various ways, such as using as raw material for blasting furnace and slag of iron silicate. In this study the iron oxide residue was tried to use as iron source of BaFe12O19 and NiFe2O4. The effect of additives of BaO and NiO, sintering parameters, and sintering agent B2O3 on the synthesis of BaFe12O19 and NiFe2O4 were investigated. The preliminary results showed that the mole ration of BaO : Fe3O4= 1 : 4, and sintering temperature of 950℃ for 2 hrs were made to synthesize the BaFe12O19, and the NiFe2O4 could be synthesized by using NiO additives and sintering condition of 1200℃/2hr. Furthermore the saturated magnetization and coercive force increase with the increasing of NiO additive for NiFe2O4 and with the increasing of the sintering temperature for BaFe12O19.

並列關鍵字

BaFe12O19 ； NiFe2O4 ； ZnFe2O4 ； Fe3O4 ； VSM

參考文獻

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