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還原劑對高磷鮞狀赤鐵礦還原焙燒鐵磷分離的影響

Effects of reductants on the reduction roasting and Fe-P separation of high phosphorus oolitic hematite

  • 摘要: 研究還原劑種類及用量對高磷鮞狀赤鐵礦還原焙燒鐵磷分離的影響.添加脫磷劑Na2CO3,在提鐵降磷的同時能降低還原鐵的硫含量;還原劑用量的增加都能促進鐵還原,但使用灰分和固定碳含量較高或揮發分含量較低的還原劑時,不利于降磷.焙燒產物的X射線衍射分析表明:添加脫磷劑Na2CO3時,隨著還原劑用量的增加,焙燒產物中金屬鐵含量增加,浮氏體和石英含量降低;使用灰分含量較高的還原劑時,隨其用量的增加,灰分會消耗Na2CO3,從而減弱其對于鐵還原的促進作用;還原劑用量相同時,石煤、煙煤、焦炭和褐煤所得焙燒產物中金屬鐵含量逐漸增加,浮氏體含量逐漸降低.總體來看,褐煤作為還原劑時鐵磷分離效果最好,其次為煙煤,焦炭和石煤.

     

    Abstract: The effects of reductant type and dosage on the reduction roasting and Fe-P separation of high phosphorus oolictic hematite were studied in this paper. Experimental results show that,with addition of Na2CO3 as a dephosphorization agent,the iron content increases,the phosphorus content decreases in direct reduced iron,and the sulfur content can be decreased at the same time.Iron reduction is promoted by increasing the reductant dosage,but reductants with higher ash and fixed carbon contents or a lower volatile content do not favor dephosphorization. X-ray diffraction analyses of roasted products indicate that Na2CO3 as a dephosphorization agent is added in reduction roasting,the content of metallic iron increases but the contents of wustite and quartz decrease with increasing reductant dosage. When using a reductant with a higher ash content,Na2CO3 can be consumed by the ash with increasing reductant dosage,thus its promotion to iron reduction weakens. At the same reductant dosage,the highest content of metallic iron in roasted products is obtained by using stone coal as a reductant,followed by bituminous coal,coke and lignite,and the content of wustite in roasted products gradually decreases. As a whole,there is the best Fe-P separation effect in this iron ore treatment by using lignite as a reductant,followed by bituminous coal,coke and stone coal.

     

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