钾长石分解尾渣提取氢氧化铝的研究
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摘要
采用低温半干法分解钾长石,分解后的固体尾渣经硫酸浸取制得含铁、铝的浸取液。以此浸取液为原料加氨得到铁铝混合物以及可溶性钾盐硫酸铵钾,进一步从铁铝混合物中制得氢氧化铝。优化工艺条件:加氨沉铝过程温度为100℃,p H=9,反应时间为30 min;碱溶过程氢氧化钠溶液质量浓度为120 g/L,固液比(g/m L)为1∶30,反应温度为100℃;碳分过程p H为10.5~11.0,反应温度为(20±5)℃。在此条件下铝的回收率达到86%以上,制得的氢氧化铝经焙烧检测氧化铝纯度达到98.97%,满足YS/T 803—2012《冶金级氧化铝》的要求。
Potassium feldspar was decomposed semi-drily at a low temperature.The decomposed residue was leached by sulfuric acid.The leaching solution was used to get ferric and aluminum mixture and soluble ammonium-potassium sulfate by adding ammonia.Lastly,aluminum hydroxide was prepared from ferric and aluminum mixture.The optimized conditions of reaction were as follows:the reaction temperature of adding ammonia was 100 ℃;the mass concentration of sodium hydroxide was 120 g/L,the reaction temperature of dissolving by sodium hydroxide was 100 ℃,the ratio of solid to liquid(g/m L) was 1∶30;and the reaction p H of adding CO_2 was 10.5~11.0;the temperature was(20±5) ℃.Under those conditions,the recovery of aluminum can be up to more than 86%,and with the product roasted,the purity of Al_2O_3 reached 98.97%,reaching the requirements of Metallurgical Alumina Standard,YS/T 803—2012.
Potassium feldspar was decomposed semi-drily at a low temperature.The decomposed residue was leached by sulfuric acid.The leaching solution was used to get ferric and aluminum mixture and soluble ammonium-potassium sulfate by adding ammonia.Lastly,aluminum hydroxide was prepared from ferric and aluminum mixture.The optimized conditions of reaction were as follows:the reaction temperature of adding ammonia was 100 ℃;the mass concentration of sodium hydroxide was 120 g/L,the reaction temperature of dissolving by sodium hydroxide was 100 ℃,the ratio of solid to liquid(g/m L) was 1∶30;and the reaction p H of adding CO_2 was 10.5~11.0;the temperature was(20±5) ℃.Under those conditions,the recovery of aluminum can be up to more than 86%,and with the product roasted,the purity of Al_2O_3 reached 98.97%,reaching the requirements of Metallurgical Alumina Standard,YS/T 803—2012.
引文
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[3]郝小非.河南省钾长石开发与利用现状[J].河南科技,2009(11):15.
[4]冯武威,马鸿文.中温分解钾长石的热力学分析与实验[J].硅酸盐学报,2004,32(7):789-799.
[5]Feng Wuwei,Ma Hongwen.Thermodynamic analysis and experiments of thermal decomposition for potassium feldspar at intermediate temperatures[J].Journal of the Chinese Ceramic Society,2004,32(7):789-799.
[6]申军.钾长石综合利用综述[J].化工矿物与加工,2000,29(10):1-3.
[7]郑朝付,李民菁,史智慧,等.低苛性比溶出在拜耳法氧化铝生产中的应用[J].矿产保护与利用,2009(3):37-40.
[8]郑秀芳.低温拜耳法赤泥回收铝、钠工艺研究[J].山东冶金,2010,32(1):16-18.
[9]陈巧英,午新威,白永民.中和法制备高纯氧化铝微粉[J].中国粉体技术,2003,9(4):16-18.
[10]杜淼,孙中溪.纳米氧化铝制备方法研究进展[J].无机盐工业,2005,37(12):9-11,56.
[11]田兴久.论拜耳法碱的循环效率[J].轻金属,2003(5):18-22.
[12]裴秀中.碳分法制取超细氢氧化铝粉体[J].上海化工,2004(2):30-32.
[13]杜善国,刘勇.碳化法制备超细氢氧化铝微粉晶种的研究[J].中国粉体技术,2011,17(4):80-82.
[14]Bénézeth P,Palmer D A,Anovitz L M,et al.Dawsonite synthesis and reevaluation of its thermodynamic properties from solubility measurements:Implications for mineral trapping of CO2[J].Geochimica et Cosmochimica Acta,2007,71(18):4438-4455.