用黄钠铁矾渣制备复合镍锌铁氧体

Preparation of Ni-Zn ferrite from sodium jarosite residue

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Ni0.5Zn0.5Fe2O4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。

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 NiSO4 and ZnSO4 are added into the purified leaching solution. When NH4 HCO3 solution is used as co-precipitated reagent, the precipitation of carbonate is obtained by changing NH4 HCO3 amount to control the pH value. Uniform spheroidal spinel type Ni0.5 Zn0.5 Fe2O4 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.