用黄钠铁矾渣制备复合镍锌铁氧体

来源期刊：中南大学学报(自然科学版)2006年第4期

论文作者：阳征会 龚竹青 李宏煦 陈文汨 龚胜

文章页码：685 - 691

关键词：黄钠铁矾;浸出;共沉淀法;镍锌铁氧体;纳米粒子

Key words：sodium jarosite; leaching; co-precipitation method; Ni-Zn ferrite; nanoparticle

摘    要：对黄钠铁矾渣制备复合镍锌铁氧体进行研究。研究结果表明:当黄钠铁矾渣与无烟煤按质量比为5∶1均匀混合,在800℃还原焙烧0.5 h,焙烧渣用0.5 mol/L硫酸溶液按液固比7∶1在70℃浸出40 min时,渣中93%的铁和镍进入浸出液中。浸出液经过净化除杂后得到含镍的硫酸亚铁溶液,加入计量的硫酸镍和硫酸锌,采用共沉淀法,以NH₄HCO₃为沉淀剂,通过改变沉淀剂的用量控制pH值制备镍锌铁碳酸盐。将镍锌铁碳酸盐在800℃煅烧2 h得到具有尖晶石结构的Ni_0.5Zn_0.5Fe₂O₄粉体,粒径约为59 nm,粒度均匀,呈球形;煅烧4 h时粉体粒径变大,粒度不均匀,呈棒状。

Abstract: The preparation of Ni-Zn ferrite from sodium jarosite residue was studied. The results show that when the mass ratio of sodium jarosite residue to anthracite is 5∶1, reduction roast lasts at 800℃for 0.5 h, leaching is carried out at 70℃for 40 min by 0. 5 mol/L H₂SO₄ with liquid-solid ratio of 7∶1, 93% of both iron and nickel can be leached out. Then appropriate amounts of NiSO₄and ZnSO₄are added into the purified leaching solution. When NH₄HCO₃ solution is used as co-precipitated reagent, the precipitation of carbonate is obtained by changing NH₄HCO₃amount to control the pH value. Uniform spheroidal spinel type Ni_0.5Zn_0.5Fe₂O₄ powders with size of 59 nm are obtained by calcining the precipitate at 800℃for 2 h, and disparity rod-like powders with increasing sizes are obtained when calcining time is 4 h.