Magnetizing roast of oolitic hematite by biomass at low temperature
-
摘要: 對生物質磁化鮞狀赤鐵礦石進行研究,包括磁化溫度、磁化時間、生物質用量以及赤鐵礦石粒度對磁化效果的影響.在磁化溫度為600℃,赤鐵礦石與生物質的質量比為10∶2的情況下,利用生物質熱解產生的氣體和焦油在30 min內可以完全磁化粒度為0.074 mm(>72.5%)的赤鐵礦石,驗證了生物質替代煤基還原劑進行磁化焙燒具有一定的可行性.此外,礦石粒度對磁化焙燒還原度的影響比較大,礦石粒度越大,完全磁化所需時間越長.根據生物質還原劑的特點,適當地減小礦石粒度可以有效改善赤鐵礦石的磁化性能.Abstract: This paper reports the magnetizing roast of oolitic hematite ore,including the dependency of the magnetization effect upon magnetization temperature,magnetization time,biomass content and ore particle size. It is indicated that the oolitic hematite ore with a particle size of 0.074 mm(>72.5%) is completely magnetized in 30 min by biomass-generated gases and tar at 600℃ when the ore-to-biomass mass ratio is 10:2,which verifies the feasibility of this substitution of biomass for coal as a reductant for magnetizing roast. In addition,the particle size of the oolitic hematite ore has great effect on the reduction index of magnetizing roast. The larger the particle size,the longer the complete magnetization time is. According to the character of biomass,the magnetic properties of the oolitic hematite ore can be effectively improved by appropriately decreasing the particle size.
-
Key words:
- hematite /
- magnetization /
- roasting /
- biomass /
- reductants /
- particle size
-

計量
- 文章訪問數: 343
- HTML全文瀏覽量: 114
- PDF下載量: 8
- 被引次數: 0