中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2015年
1期
250-257
,共8页
杨慧芬%蒋蓓萍%王亚运%苑修星%张莹莹
楊慧芬%蔣蓓萍%王亞運%苑脩星%張瑩瑩
양혜분%장배평%왕아운%원수성%장형형
煤泥%还原剂%浸锌渣%直接还原%有价金属
煤泥%還原劑%浸鋅渣%直接還原%有價金屬
매니%환원제%침자사%직접환원%유개금속
coal slime%reducing agent%zinc leaching residue%direct reduction%valuable metals
以煤泥为新型还原剂，探索了煤泥用量、CaO 与 SiO2摩尔比、焙烧温度以及焙烧时间等工艺参数对浸锌渣中铅、锌、铁化合物直接还原的影响，分析不同直接还原温度下还原产物，即焙砂中所含矿物的种类及铁的存在物相，观察最佳还原条件下焙砂中铁颗粒的形貌，最后进行了焙砂的磨矿?磁选试验。结果表明：在煤泥用量45%、CaO与SiO2摩尔比1.2、经1250℃直接还原90 min后，浸锌渣中锌和铅的挥发率分别达到96.69%和97.65%，焙砂中铁的金属化率达到97.78%。铁在焙砂中主要以金属铁颗粒的形式存在，其嵌布粒度多数＞20μm，金属铁颗粒与渣相界面分明，表明可通过磨矿实现单体解离。采用二段磨矿?磁选流程，可同时获得含铁90.80%的金属铁粉和含铁65%的铁精矿，铁的总回收率为81.19%。由此证明煤泥是一种还原效果优良的浸锌渣还原剂。
以煤泥為新型還原劑，探索瞭煤泥用量、CaO 與 SiO2摩爾比、焙燒溫度以及焙燒時間等工藝參數對浸鋅渣中鉛、鋅、鐵化閤物直接還原的影響，分析不同直接還原溫度下還原產物，即焙砂中所含礦物的種類及鐵的存在物相，觀察最佳還原條件下焙砂中鐵顆粒的形貌，最後進行瞭焙砂的磨礦?磁選試驗。結果錶明：在煤泥用量45%、CaO與SiO2摩爾比1.2、經1250℃直接還原90 min後，浸鋅渣中鋅和鉛的揮髮率分彆達到96.69%和97.65%，焙砂中鐵的金屬化率達到97.78%。鐵在焙砂中主要以金屬鐵顆粒的形式存在，其嵌佈粒度多數＞20μm，金屬鐵顆粒與渣相界麵分明，錶明可通過磨礦實現單體解離。採用二段磨礦?磁選流程，可同時穫得含鐵90.80%的金屬鐵粉和含鐵65%的鐵精礦，鐵的總迴收率為81.19%。由此證明煤泥是一種還原效果優良的浸鋅渣還原劑。
이매니위신형환원제，탐색료매니용량、CaO 여 SiO2마이비、배소온도이급배소시간등공예삼수대침자사중연、자、철화합물직접환원적영향，분석불동직접환원온도하환원산물，즉배사중소함광물적충류급철적존재물상，관찰최가환원조건하배사중철과립적형모，최후진행료배사적마광?자선시험。결과표명：재매니용량45%、CaO여SiO2마이비1.2、경1250℃직접환원90 min후，침자사중자화연적휘발솔분별체도96.69%화97.65%，배사중철적금속화솔체도97.78%。철재배사중주요이금속철과립적형식존재，기감포립도다수＞20μm，금속철과립여사상계면분명，표명가통과마광실현단체해리。채용이단마광?자선류정，가동시획득함철90.80%적금속철분화함철65%적철정광，철적총회수솔위81.19%。유차증명매니시일충환원효과우량적침자사환원제。
The effects of technical parameters, such as the mass ratio of coal slim to zinc-leaching residue, the mole ratio of CaO to SiO2, reduction temperature and time, on the direct reduction of zinc-leaching residue containing zinc, lead and iron compounds were explored using coal slime as a new reducing agent. The types of minerals and iron phase in roasted products generated at different temperatures were analyzed. The morphologies of iron particles in calcine were observed under the optimum reduction condition. Finally, the grinding-magnetic separation tests of the calcine were carried out. The results show that the roasted products with evaporation rates of zinc 96.69% and lead 97.65% in the zinc-leaching residues, metallization rate of iron 97.78% are obtained under optimum conditions of the ratio of coal slim to zinc-leaching residues 45%, mole ratio of CaO to SiO2 1.2, direction reduction at 1250℃ for 90 min. The iron in calcine is basically metallic iron. The metallic iron particles size is more than 20μm. The obvious boundaries can be observed between the metallic iron particles and slag phase, showing the feasibility of monomer dissociation of metallic iron particles. The metallic iron powders with iron grade of 90.80% and iron concentrate with iron grade of 65% are synchronously recovered by two stage grinding-magnetic separation process, and the total iron recovery is 81.19%. Therefore, the coal slime is proved to be a good reducing agent for the direct reduction of zinc-leaching residue. Therefore, the coal slime is proved to be a good reducing agent for the direct reduction of zinc-leaching residue.
