淀粉水热法分离高铁铝土矿中铝铁矿物的研究
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摘要
以淀粉为还原剂,通过其碱性降解产物在高压水热还原方法下分离高铁铝土矿中铝铁矿物。试验表明,在温度280℃、NaOH浓度180g/L时,铝、铁溶出还原率最高,分别为88.2%、92.3%%,产物平均粒径2.6μm左右。在保证铝彻底溶出的条件下,温度是控制氧化铁还原的主要控制环节,苛性钠浓度的影响不大。
Aluminum-iron minerals in high-iron bauxite were separated by high-pressure hydrothermal reduction applying degradation products of starch in alkalinity system as reductant.The results show that aluminum dissolution rate and iron reduction rate is as high as 88.2% and 92.3% respectively under the conditions of temperature of 280℃and NaOH concentration of 180 g/L.Average particle size of product is about 2.6μm.Under the condition of ensuring complete dissolution of aluminum,temperature is the main factor to control reduction of iron oxide,while NaOH concentration has little effect.
Aluminum-iron minerals in high-iron bauxite were separated by high-pressure hydrothermal reduction applying degradation products of starch in alkalinity system as reductant.The results show that aluminum dissolution rate and iron reduction rate is as high as 88.2% and 92.3% respectively under the conditions of temperature of 280℃and NaOH concentration of 180 g/L.Average particle size of product is about 2.6μm.Under the condition of ensuring complete dissolution of aluminum,temperature is the main factor to control reduction of iron oxide,while NaOH concentration has little effect.
引文
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[5]李军旗,邹勇,陈朝轶,等.三水型铝土矿磁选除铁及Al2O3溶出性能研究[J].湿法冶金,2014,33(1):28-31.
[6]董红军,麦笑宇.平果铝土矿原矿浆选铁技术研究[J].矿冶工程,2015,35(3):63-69.
[7]LI Z Y,JIN J Y,WANG Y K,et al.Study on preparation of iron powder and nano-carbon black by reaction process of high-iron bauxite and natural gas[J].Integrated Ferroelectrics,2015,160(1):160-168.
[8]PICKLES C A,LU T,CHAMBERS B,Et al.A study of reduction and magnetic separation of iron from high iron bauxite ore[J].Journal of Iron and Steel Research International,2012,19(8):1-5.
[9]张颖异,程项利,齐渊洪,等.高铁铝土矿直接还原回收粒铁和氧化铝[J].钢铁,2015,50(4):17-22.
[10]HU W T,WANG H J,LIU X W,et al.Effects of minerals in ferric bauxite on sodium carbonate decomposition and volatilization[J].Journal of Central South University,2015,22(7):203-250.
[11]辛海霞,吴艳,刘少名,等.高铁铝土矿与硫酸氢铵混合焙烧工艺[J].中国有色金属学报,2014,24(3):808-813.
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[13]ZHU D Q,CHUN T J,PAN J,et al.Recovering of iron from high-iron red mud by reduction roasting with adding sodium salt[J].Journal of Iron and Steel Research International,2012,19(8):1-5.
[14]CHUN T J,ZHU D Q,PAN J,et al.Preparation of metallic iron powder from red mud by sodium salt roasting and magnetic separation[J].Canadian Metallurgical Quarterly,2014,53(2):183-189.
[15]LI G H,LIU M X,RAO M J,et al.Stepwise extraction of valuable components from red mud based on reductive raosting with sodium salts[J].2014,280:774-780.
[16]DEBADATTA DAS,PRAMANIK K.A study on chemical leaching of iron from red mud using sulphuric acid[J].Research Journal of Chemistry and Environment,2013,17(7):50-56.
[17]吕国志,张廷安,赵爱春,等.酸浸及萃取对高铁铝土矿中有价元素分离特性的影响[J].东北大学学报(自然科学版),2013,34(10):1442-1445.
[18]赵爱春,张廷安,吕国志,等.低温酸浸高铁铝土矿中铁和铝的溶出规律研究[J].功能材料,2012,43(增刊1):105-108.
[19]PANG Z H,XU R L,LUO T Q,et al.Physiochemical properties of modified starch under yogurt manufacturing conditions and its relation to the properties of yogurt[J].Journal of Food Engineering,2013,19(2):218-245.