MgCl_2溶液中杂质离子的存在对氨气法制备Mg(OH)_2粒径的影响
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摘要
MgCl_2是Mg(OH)_2 (MH)化学沉淀中常用的前驱体,但来自海水、菱镁矿和白云石等的MgCl_2中可能存在一些杂质,可能会影响所制备MH的质量。介绍了在MgCl_2溶液中分别加入不同种类的杂质离子,通过氨气沉淀法制备Mg(OH)_2(MH)产品,以此研究杂质离子的存在对所制备MH产品粒径的影响规律。实验结果表明,在MgCl_2溶液中阳离子的存在对所制备MH的粒径没有明显的影响,但阴离子的存在对所制备MH的粒径有显著的影响。当多价阴离子或单价AC~-存在时,甚至当杂质离子与MgCl_2的摩尔比低至1:120时,所制备的MH的平均粒径也可显著增加,而且其粒径分布也明显变宽。但是当阴离子杂质为单价的NO_3~-或Br~-时,对所制备的MH的粒径却没有明显的影响。
Some kinds of impurities may exist in the MgCl_2 precursors from sea water,magnesite, dolomite, etc, which may affect the quality of prepared Mg(OH)_2. In this paper, Mg(OH)_2 was precipitated from MgCl_2 aqueous solution via gaseous ammonia method. Before the precipitation of Mg(OH)_2, different impurity ions were respectively added to the MgCl_2 solution in order to study the effect of the presence of impurity ions in MgCl_2 solution on the particle size of prepared Mg(OH)_2. The results showed that the presence of cation in MgCl_2 solution had not obvious effect on the particle size of prepared Mg(OH)_2,while anions had obvious effect. The presence of multivalent anion or univalent acetate ion not only markedly increased the average particle size, but also obviously broadened the particle size distribution, even when the molar ratio of impurity ions to MgCl_2 was as low as 1:120. However, the presence of NO_3~ -or Br~- had no obvious effect on the particle size of prepared Mg(OH)2.
Some kinds of impurities may exist in the MgCl_2 precursors from sea water,magnesite, dolomite, etc, which may affect the quality of prepared Mg(OH)_2. In this paper, Mg(OH)_2 was precipitated from MgCl_2 aqueous solution via gaseous ammonia method. Before the precipitation of Mg(OH)_2, different impurity ions were respectively added to the MgCl_2 solution in order to study the effect of the presence of impurity ions in MgCl_2 solution on the particle size of prepared Mg(OH)_2. The results showed that the presence of cation in MgCl_2 solution had not obvious effect on the particle size of prepared Mg(OH)_2,while anions had obvious effect. The presence of multivalent anion or univalent acetate ion not only markedly increased the average particle size, but also obviously broadened the particle size distribution, even when the molar ratio of impurity ions to MgCl_2 was as low as 1:120. However, the presence of NO_3~ -or Br~- had no obvious effect on the particle size of prepared Mg(OH)2.
引文
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[16]K.P.Matabola,E.M.van der Merwe,C.A.,et al.The influence of hydrating agents on the hydration of industrial magnesium oxide[J].Journal of Chemical Technology and Biotechnology,2010,85(12):1569-1574.
[17]D.Filippou,N.Katiforis,N.Papassiopi,et al.On the kinetics of magnesia hydration in magnesium acetate solutions[J].Journal of Chemical Technology and Biotechnology,1999,74(4):322-328.
[2]S.Yousefi,B.Ghasemi,M.Tajally.et al.A.Optical properties of MgO and Mg(OH)2 nanostructures synthesized by a chemical precipitation method using impure brine[J].Journal of Alloys and Compounds.2017,711:521-529.
[3]苏明阳,王海军,唐林生.氢氧化镁阻燃剂的应用现状及研究进展[J].当代化工,2015,44(1):114-119.
[4]刘立平.氯化镁国内生产现状及新产品开发[C].中国无机盐工业协会镁化合物分会年会论文集,2015:50-56.
[5]Hongfan Guo,Han Hu,.Jiayang Xie,et al.Gaseous ammonia:superior to aqua ammonia in the precipitation of Mg(OH)2 under mild conditions[J].RSC Advances,2014,4:28822-28825.
[6]李三喜,任晓宇,王松.用轻烧氧化镁粉制备高纯氢氧化镁的研究[J].无机盐工业,2015,7(9):31-34.
[7]Hongfan Guo,Han H.,Jiayang Xie,et al.Preparation of Lamellar Mg(OH)2 with Caustic Calcined Magnesia through Apparent Hydration of MgO[J].Industrial&Engineering Chemistry Research,2013,52(38):13661-13668.
[8]Hongfan Guo,Yansong Pei,Wang Zhuo.,et al Preparation of Mg(OH)2 with caustic calcined magnesia through ammonium acetate circulation[J].Hydrometallurgy,2015,152:13-19.
[9]Haoliang Dong,Cise Unluer,En-Hua Yang,et al.Synthesis of reactive MgO from reject brine via the addition of NH4OH[J].Hydrometallurgy,2017,169:165-172.
[10]M.Akizuki,Y.Nakai,T.Fujii,et al.Kinetic Analysis of a Solid Base-Catalyzed Reaction in Sub-and Supercritical Water Using Aldol Condensation with Mg(OH)2 as a Model[J].Industrial&Engineering Chemistry Research,2017,56(42):12111-12118.
[11]李雪,程沛,侯睿,等.轻烧粉氨气法制备氢氧化镁阻燃剂的研究[J].无机盐工业,2016,48(11):21-24.
[12]A.Alamdari,M.R.Rahimpour,N.Esfandiari,et al.Kinetics of magnesium hydroxide precipitation from sea bittern[J].Chemical Engineering and Processing.2008,47(2):215-221.
[13]C.Henrist,J.-P.Mathieu,C.Vogels,,et al.Morphological study of magnesium hydroxide nanoparticles precipitated in dilute aqueous solution[J].Journal of Crystal Growth,2003,249(1-2):321-330.
[14]Dehong Chen,Lunyu Zhu,Huaiping Zhang,et al.Magnesium hydroxide nanoparticles with controlled morphologies via wet coprecipitation[J].Materials Chemistry and Physics.2008,109(2-3):224-229.
[15]K.Chhor,J.F.Bocquet,C.Pommier.,Syntheses of submicron magnesium oxide powders[J].Materials Chemistry and Physics,1995,40(1):63-68.
[16]K.P.Matabola,E.M.van der Merwe,C.A.,et al.The influence of hydrating agents on the hydration of industrial magnesium oxide[J].Journal of Chemical Technology and Biotechnology,2010,85(12):1569-1574.
[17]D.Filippou,N.Katiforis,N.Papassiopi,et al.On the kinetics of magnesia hydration in magnesium acetate solutions[J].Journal of Chemical Technology and Biotechnology,1999,74(4):322-328.