制備高品位磁鐵精礦
唐艷云1，崔 瑜1
(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083；
2. 江西銅業(yè)集團(tuán)化工有限公司，德興 334202)
摘 要: 進(jìn)行了硫酸渣復(fù)合球團(tuán)還原焙燒－磁選實(shí)驗(yàn)。研究結(jié)果表明：以鐵品位低(TFe 45.56％)、銅和硫含量高(Cu 0.19%，S 1.45%)的某硫酸渣為原料，添加復(fù)合添加劑5%，在圓盤造球機(jī)上制備復(fù)合球團(tuán)，將生球干燥后進(jìn)回轉(zhuǎn)窯還原焙燒，往每噸復(fù)合球團(tuán)中噴入煤300 kg，在700~800 ℃還原焙燒20 min，將還原焙燒后產(chǎn)物通過兩段球磨、四段磁選工藝，可得到鐵品位高(總鐵含量為66.23％)，Cu和S含量低(Cu 0.048%，S 0.053%)的優(yōu)質(zhì)磁鐵精礦，其鐵回收率達(dá)73.32%，銅脫除率達(dá)74.73%，硫脫除率達(dá)96.34%。實(shí)驗(yàn)的關(guān)鍵技術(shù)是復(fù)合粘結(jié)劑促進(jìn)鐵氧化物的還原及銅、硫等雜質(zhì)的轉(zhuǎn)化，在磁選分離過程中脫除雜質(zhì)。使用此新工藝，能綜合利用硫酸渣中鐵資源，擴(kuò)大鋼鐵工業(yè)原料來源。
關(guān)鍵字: 硫酸渣；復(fù)合球團(tuán)；還原焙燒；磁選
cinder by composite pellet reduction-roasting and
magnetic-separation
ZHAI Yong1, TANG Yan-yun1, CUI Yu1
（1. School of Minerals Processing and Bioengineering, Central South University,
Changsha 410083, China;
2. Jiangxi Copper Chemical Co. Ltd., Dexing 334202, China）
Abstract:A new technology of composite pellet reduction-roasting and magnetic-separation (CPRM) was developed for utilization of pyrite cinder, a common by-product in vitriol industry. Pyrite cinder, containing 45.56% Fe, 0.19% Cu and 1.45% S, was pelletized with addition of 5% composite agent in balling disc. Green balls after drying were reduced at 700−800 ℃ for 20 min with 300 kg/t pulverized coal injection in rotary kiln. After two-stage ball-grinding and four stages magnetic separation, magnetite concentrate with iron grade of 66.23% Fe and containing 0.048% Cu and 0.053% S were made. And iron recovery of 73.32%, desulphurization degree of 96.34% and decoppering degree of 74.73% were achieved. Key technique is that composite agent can accelerate reduction of Fe2O3 and transfer copper and sulphur into water-soluble inorganic salts, which are removed during wet magnetic concentration. This new technology can be used to fully utilize pyrite cinder and produce high quality magnetite concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of pyrite cinder and extend raw material sourcing for Chinese steel industry.
Key words: pyrite cinder; composite pellet; reduction roasting; magnetic-separation
