摘要
以拜耳法赤泥为研究对象,对比分析硫酸、冰醋酸、草酸对赤泥中钠、铁浸出的影响。结果表明:硫酸对钠、铁浸出率影响较显著。增加硫酸浓度有助于提高钠的浸出率,20℃、1.8 mol/L硫酸、浸出时间为30 min条件下,钠的浸出率为99.99%。增加硫酸浓度和升高温度有助于提高铁的浸出率,2.8 mol/L硫酸、50℃、浸出时间为45 min时,铁的浸出率为67.93%。硫酸对赤泥中钠、铁的浸出动力学机制均符合内扩散控制模型,且铁浸出反应的表观活化能为37.50 k J/mol。硫酸浸钠后赤泥中形成的晶型物相包括二水硫酸钙、三氧化二铁、氢氧化铝和二氧化钛,浸铁后的晶型物相主要是二水硫酸钙和二氧化钛。
The extraction rates of sodium and iron from red mud of Bayer process by H2SO4,CH3COOH,and H2C2O4 were mainly discussed and analyzed comparatively.The results showed effect of H2SO4 on extraction rates of Na and Fe was dramatic. Na extraction rate was raised by increasing H2SO4 concentration and was 99.99% under the conditions of 20 ℃, 1.8 mol/L H2SO4,and 30 min reaction time.Fe extraction rate,increase of which was induced by H2SO4 concentration and temperature, was 67.93 % at 2.8 mol/L H2SO4,50 ℃, and 45 min reaction time.The kinetics processes of Na and Fe extraction by H2SO4 followed the internal diffusion-controlled mode and the apparent activation energy of Fe extraction was determined to be 37.50 kJ/mol.Crystalline minerals after Na extraction were mainly CaSO4· 2H2O, Fe2O3, Al （OH）3, and TiO2.Crystalline minerals after Fe extraction were CaSO4· 2H2O and TiO2.
出处
《无机盐工业》
CAS
北大核心
2016年第1期44-48,共5页
Inorganic Chemicals Industry
基金
贵州省科学技术厅、安顺市人民政府、安顺学院联合科技基金资金资助(黔科合J字[2012]01号)
关键词
赤泥
H2SO4
动力学机制
矿物相变化
red mud
sulphuric acid
kinetics mechanism
change of mineral components
