本文關(guān)鍵詞： 紅土鎳礦 硫酸鈉 還原焙燒 鎳鐵　出處：《過程工程學(xué)報(bào)》2017年06期 　論文類型：期刊論文

【摘要】：以Na2SO4為添加劑,采用煤基還原-磁選工藝,對(duì)含Ni 1.17%和Fe 35.71%的褐鐵型紅土礦選擇性還原富集鎳鐵的行為進(jìn)行了研究.結(jié)果表明,原礦中27.40%的鎳以氧化物形式存在,69.35%的鎳以硅酸鹽形式存在;在還原溫度1100℃、還原時(shí)間60 min、硫酸鈉用量20%(?)、無煙煤用量8%(?)的最佳還原條件下,在200 m T的磁場強(qiáng)度下濕式磁選,可富集得到鎳品位13.26%、鎳回收率88.4%、鐵品位67.34%、鐵回收率14.71%的鎳鐵精礦,鎳富集比達(dá)11.33.紅土鎳礦還原過程中加入Na2SO4破壞了原礦中硅酸鹽的結(jié)構(gòu),釋放出其中的鎳與鐵,進(jìn)一步生成Fe S,抑制鐵深度還原并降低了體系熔點(diǎn),有利于金屬離子傳質(zhì),促進(jìn)鎳鐵顆粒長大.
[Abstract]:The selective reduction and enrichment of ferronickel from brown-iron laterite containing Ni _ (1.17%) and Fe _ (35.71%) were studied by coal based reduction-magnetic separation with Na2SO4 as additive. 27.40% of the nickel in the ore exists in the form of oxides, 69.35% of the nickel is in the form of silicate, and the amount of sodium sulfate is 20% at the reduction temperature of 1100 鈩，

本文編號(hào)：1517665