无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2016, Vol. 48 ›› Issue (1): 44-.

• 论文 • 上一篇    下一篇

赤泥中钠铁酸法浸出的工艺条件和机理探讨

陈红亮,汪 婷,柯 杨,王胜碧   

  1. 安顺学院贵州省教育厅功能材料与资源化学特色重点实验室,化学化工学院,贵州安顺 561000
  • 出版日期:2016-01-10 发布日期:2016-01-20

Technology conditions and mechanism discussion of sodium and iron extraction from red mud by acid

 CHEN  Hong-Liang, WANG   Ting, KE   Yang, WANG  Sheng-Bi   

  1. Guizhou Special and Key Laboratory of Material Science and Resource Chemistry,College of Chemistry and
    Chemical Engineering,Anshun University,Anshun 561000,China
  • Published:2016-01-10 Online:2016-01-20

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 kJ/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。

关键词: 赤泥, H2SO4, 动力学机制, 矿物相变化

Abstract: 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?鄄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.

Key words: red mud, sulphuric acid, kinetics mechanism, change of mineral components

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