摘要
采用硫铁精矿作还原剂还原硫铁矿烧渣酸浸液(硫酸铁),并用沉淀法从硫酸亚铁溶液制备-αFe2O3。实验结果表明:当硫酸铁溶液中Fe3+浓度为1.1 mol/L时,在液固比为3∶2,温度为90℃,搅拌速度500 r/min的条件下,反应3 h,硫酸铁溶液中Fe3+的还原率达到96.5%,其反应级数为1.66级,表观活化能为60.26 kJ/mol。还原后得到的硫酸亚铁经过净化除杂,滴加到含有适量有机添加剂的沉淀剂NH4OH-NH4HCO3中,沉淀洗涤干燥后900℃煅烧2 h,煅烧产品再用稀硝酸和氢氟酸洗涤,得到高纯球形-αFe2O3。
Acidic leaching solution（Fe2（SO4）3） of tmilite cinder is reduced using pyrite concentrate as reductant and α-Fe2O3 is prepared from FeSO4 solution by precipitation. The results show that the reduction degree of Fe^3＋ in the acidic leaching solution can reach 96.5 %, the reaction order of Fe^3＋ is 1.66 and the apparent activation energy is 66.26 kJ/mol, at a Fe^3＋ concentration of 1.1 mol/L, L/S ratio of 3：2, a faction temperature of 90℃, a stirring speed of 500 r/min and a reaction time 3 hours. The FeSO4 obtained by reduction is purified, adding to NH4OH-NH4HCO3 solution containing organic additives, precipitated and finally washed and then calcined at 900℃ for 2 hours. The calcined product is washed using dilute nitric acid and hydrofluoric acid, obtaining high-purity α-Fe2O3.
出处
《矿冶工程》
CAS
CSCD
北大核心
2005年第6期70-73,共4页
Mining and Metallurgical Engineering
