CN109626386B - 一种高纯度镁皂石的制备方法 - Google Patents
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- 239000011777 magnesium Substances 0.000 title claims abstract description 83
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 74
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910000275 saponite Inorganic materials 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 96
- 239000007864 aqueous solution Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000008367 deionised water Substances 0.000 claims abstract description 41
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 41
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 31
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000010703 silicon Substances 0.000 claims abstract description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 28
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 25
- 238000002425 crystallisation Methods 0.000 claims abstract description 24
- 230000008025 crystallization Effects 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 20
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 13
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 12
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 12
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000011259 mixed solution Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000007873 sieving Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical group [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical group [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical group Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 4
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 18
- 239000013078 crystal Substances 0.000 abstract description 15
- 150000002500 ions Chemical class 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 3
- 238000004220 aggregation Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 238000000975 co-precipitation Methods 0.000 abstract description 3
- -1 hydroxide ions Chemical class 0.000 abstract description 3
- 238000000247 postprecipitation Methods 0.000 abstract description 3
- 239000007785 strong electrolyte Substances 0.000 abstract description 2
- 239000011549 crystallization solution Substances 0.000 abstract 1
- 229940091250 magnesium supplement Drugs 0.000 description 58
- 239000000126 substance Substances 0.000 description 13
- 239000000395 magnesium oxide Substances 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- 239000000243 solution Substances 0.000 description 11
- 239000011734 sodium Substances 0.000 description 7
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000344 soap Substances 0.000 description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- MFUVDXOKPBAHMC-UHFFFAOYSA-N magnesium;dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MFUVDXOKPBAHMC-UHFFFAOYSA-N 0.000 description 4
- JGDITNMASUZKPW-UHFFFAOYSA-K aluminium trichloride hexahydrate Chemical compound O.O.O.O.O.O.Cl[Al](Cl)Cl JGDITNMASUZKPW-UHFFFAOYSA-K 0.000 description 3
- 229940009861 aluminum chloride hexahydrate Drugs 0.000 description 3
- HDFXRQJQZBPDLF-UHFFFAOYSA-L disodium hydrogen carbonate Chemical compound [Na+].[Na+].OC([O-])=O.OC([O-])=O HDFXRQJQZBPDLF-UHFFFAOYSA-L 0.000 description 3
- MQRJBSHKWOFOGF-UHFFFAOYSA-L disodium;carbonate;hydrate Chemical compound O.[Na+].[Na+].[O-]C([O-])=O MQRJBSHKWOFOGF-UHFFFAOYSA-L 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910020068 MgAl Inorganic materials 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 2
- 229940063656 aluminum chloride Drugs 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 229960002337 magnesium chloride Drugs 0.000 description 2
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 2
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000007144 microwave assisted synthesis reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XNDZQQSKSQTQQD-UHFFFAOYSA-N 3-methylcyclohex-2-en-1-ol Chemical compound CC1=CC(O)CCC1 XNDZQQSKSQTQQD-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910019092 Mg-O Inorganic materials 0.000 description 1
- 229910019395 Mg—O Inorganic materials 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940021013 electrolyte solution Drugs 0.000 description 1
- 125000001153 fluoro group Chemical class F* 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 235000019794 sodium silicate Nutrition 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
一种高纯度镁皂石的制备方法,所述方法为:将去离子水、水玻璃、氢氧化钠混合配制成含硅水溶液;将去离子水、镁盐混合配制成含镁水溶液;将去离子水、铝盐、钾盐、氢氧化钠、碳酸氢钠混合配制成含铝水溶液;在搅拌条件下,先将含镁水溶液和含铝水溶液混合,得到混合液,再将含硅水溶液加到所得混合液中,得到晶化液;将所得晶化液加到晶化釜中恒温晶化,之后冷却至室温,离心、水洗、干燥、破碎、过筛,得到镁皂石;本发明通过强电解质溶液的离子强度协同氢氧根离子和碳酸根离子,调节晶化液的碱度和非构晶离子的浓度,协调构晶离子的定向速率和聚集速率,优化皂石晶核形成和晶核长大条件,避免共沉淀和后沉淀,提高晶体的纯度,减少杂质的形成。
Description
(一)技术领域
本发明涉及一种高纯度镁皂石的制备方法。
(二)背景技术
镁皂石是一种蒙皂石类层状硅酸盐矿物,具有2:1型三八面体结构。它的结构单元层是由两层Si-O四面体片夹一层Mg-O(OH)八面体片构成。钠型镁皂石的理想化学式为Nax[Mg6(Si8-xAlx)]O20(OH)4(0.2≤x<1.6)。镁皂石除了具有粒径小、比表面积大、层间离子可交换等粘土矿物所共有的特性外,还具有高表面酸碱性、高热稳定性和强胶体性能,在化工、纺织、环境、医药等行业应用非常广泛。
镁皂石资源非常稀少,而且天然的皂石中杂质含量高,提纯困难,因此通常采用人工方法合成。镁皂石的合成方法主要有水热合成、微波辅助合成以及非水热合成法。合成原料采用镁盐或氧化镁或氢氧化镁、无机铝盐或异丙醇铝、硅源(硅酸钠、水玻璃、二氧化硅、正硅酸乙酯等)、氟盐或氟化氢等。镁皂石通过这些原料在高浓度的氢氧化钠或氢氧化钠-碳酸氢钠或碳酸钠-碳酸氢钠溶液中晶化获得。在高浓度的氢氧化钠溶液中很难合成比较完美的镁皂石晶体。在含有高浓度的氢氧化钠-碳酸氢钠或碳酸钠-碳酸氢钠溶液中合成的镁皂石容易出现皂石晶体不纯,含有较多的杂质,如碳酸镁、氢氧化镁和氧化镁等,杂质的含量一般高于10%,而这些杂质又很难去除,从而影响它的使用性能。
(三)发明内容
本发明目的在于提供一种高纯度镁皂石的制备方法。通过离子强度、氢氧化钠、碳酸氢钠协同调节氢氧根离子的浓度,协调构晶离子的定向速率和聚集速率,优化皂石晶核形成和晶核长大条件,避免共沉淀和后沉淀,提高晶体的纯度,减少杂质的形成。
本发明的技术方案如下:
一种高纯度镁皂石的制备方法,所述方法包括如下步骤:
(1)将去离子水、水玻璃、氢氧化钠混合配制成含硅水溶液;
所述水玻璃以所含硅计与去离子水、氢氧化钠的物质的量之比为1:60-83:0.8-2;
(2)将去离子水、镁盐混合配制成含镁水溶液;
所述镁盐以所含镁计与去离子水的物质的量之比为1:17-33;
所述镁盐为氯化镁或硝酸镁;
(3)将去离子水、铝盐、钾盐、氢氧化钠、碳酸氢钠混合配制成含铝水溶液;
所述铝盐以所含铝计与去离子水、氢氧化钠、碳酸氢钠、钾盐以所含钾计的物质的量之比为1:90-1865:1.3-60:5.5-120:1-50;
所述铝盐为氯化铝或硝酸铝;
所述钾盐为氯化钾或硝酸钾;
(4)在搅拌条件下,先将步骤(2)配制的含镁水溶液和步骤(3)配制的含铝水溶液混合,得到混合液,再将步骤(1)配制的含硅水溶液加到所得混合液中,得到晶化液;
所述含镁水溶液所含的镁与含硅水溶液所含的硅、含铝水溶液所含的铝的物质的量之比为1:1.08-1.3:0.03-0.3;
(5)将步骤(4)所得晶化液加到晶化釜中,在100-200℃下恒温晶化6-24h,之后冷却至室温(20~30℃),离心、水洗、干燥(60-120℃,6-24h)、破碎、过筛(100目),得到镁皂石。
本发明方法制得的镁皂石纯度高,杂质含量基于MgO计,不大于7%。
本发明的有益效果在于:
传统的水热合成镁皂石技术,通常在含有高浓度的氢氧化钠或碳酸根离子的氢氧化钠-碳酸氢钠或碳酸钠-碳酸氢钠溶液中晶化获得,合成的镁皂石容易出现皂石晶体不纯,含有较多的杂质,如碳酸镁、氢氧化镁,杂质的含量一般高于10%,这些杂质以胶体形式存在,很难去除,从而影响它的使用性能。本发明提供的高纯度镁皂石的制备方法,通过强电解质溶液的离子强度协同氢氧根离子和碳酸根离子,调节晶化液的碱度和非构晶离子的浓度,协调构晶离子的定向速率和聚集速率,优化皂石晶核形成和晶核长大条件,避免共沉淀和后沉淀,提高晶体的纯度,减少杂质的形成。
(四)附图说明
图1:实施例1~4制备的镁皂石的XRD图谱。
(五)具体实施方式
下面以具体实施例对本发明的技术方案做进一步说明,但本发明的保护范围不限于此。
实施例中用到的水玻璃购自江苏彤晟化学试剂有限公司,二氧化硅含量27%,氢氧化钠含量14%。
实施例1
本实施例的一种高纯度镁皂石的制备方法,包括如下步骤:
1)按水玻璃中的硅:去离子水:氢氧化钠的摩尔比为1.0∶63.0∶1.0,将水玻璃288.9g、去离子水1474g、氢氧化钠52.8g混合,配制成含硅的水溶液。
2)按镁盐中的镁:去离子水的摩尔比为1∶16.7,将六水硝酸镁256g、去离子水300g,配制成含镁的水溶液。
3)按铝盐中的铝:去离子水:氢氧化钠:碳酸氢钠:钾盐中的钾的摩尔比为1.0∶1481.5∶53.9∶59.5∶20.3,将六水氯化铝7.25g、去离子水800g、氢氧化钠64.7g、碳酸氢钠150g、氯化钾45.3g混合,配制含铝的水溶液。
4)在搅拌条件下,将步骤(1)配制的含硅水溶液加入步骤(2)配制的含镁水溶液和步骤(3)配制的含铝水溶液的混合液中,得到晶化液。该晶化液中镁:硅:铝的摩尔比为1:1.3:0.03。
5)该晶化液放入晶化釜中,恒温120℃晶化10h,冷却后,离心,水洗,60℃干燥20h,破碎,过100目筛,得高纯镁皂石115.2g,经元素分析得到,皂石的化学组成为SiO260.53%,MgO 33.92%,Al2O3 1.5%,Na2O 2.95%,K2O 1.10%,该镁皂石化学式为Na0.72K0.18[Mg6(Si7.61Al0.22)]O20(OH)4·0.38MgO,杂质MgO含量为1.92%。图1中(a)为实施例1中的制备的镁皂石的XRD图谱。
实施例2
本实施例的一种高纯度镁皂石的制备方法,包括如下步骤:
1)按水玻璃中的硅:去离子水:氢氧化钠的摩尔比为1.0∶71.1∶0.90,将水玻璃277.8g、去离子水1600g、氢氧化钠46.2g混合,配制成含硅的水溶液。
2)按镁盐中的镁:去离子水的摩尔比为1∶22.2,将六水氯化镁203g、去离子水400g,配制成含镁的水溶液。
3)按铝盐中的铝:去离子水:氢氧化钠:碳酸氢钠:钾盐中的钾的摩尔比为1.0∶388.9∶17.5∶19∶9.4,将六水氯化铝24.15g、去离子水700g、氢氧化钠70.0g、碳酸氢钠160g、氯化钾70g混合,配制含铝的水溶液。
4)在搅拌条件下,将步骤(1)配制的含硅水溶液加入步骤(2)配制的含镁水溶液和步骤(3)配制的含铝水溶液的混合液中,得到晶化液。该晶化液中镁:硅:铝的摩尔比为1:1.25:0.1。
5)该晶化液放入晶化釜中,恒温180℃晶化18h,冷却后,离心,水洗,90℃干燥12h,破碎,过100目筛,得高纯镁皂石128.6g。经元素分析得到,皂石的化学组成为SiO256.93%,MgO 31.90%,Al2O3 4.01%,Na2O 4.25%,K2O 2.19%,该镁皂石化学式为Na1.04K0.35[Mg6(Si7.2Al0.6)]O20(OH)4·0.02MgO,杂质MgO含量为0.1%。图1中(b)为实施例2中的制备的镁皂石的XRD图谱。
实施例3
本实施例的一种高纯度镁皂石的制备方法,包括如下步骤:
1)按水玻璃中的硅:去离子水:氢氧化钠的摩尔比为1.0∶76.9∶0.9,将水玻璃255.6g、去离子水1591g、氢氧化钠39.6g混合,配制成含硅的水溶液。
2)按镁盐中的镁:去离子水的摩尔比为1∶27.8,将六水氯化镁203g、去离子水500g,配制成含镁的水溶液。
3)按铝盐中的铝:去离子水:氢氧化钠:碳酸氢钠:钾盐中的钾的摩尔比为1.0∶166.7∶8.6∶10.1∶3.5,将九水硝酸铝75.0g、去离子水600g、氢氧化钠68.6g、碳酸氢钠170g、硝酸钾70.7g混合,配制含铝的水溶液。
4)在搅拌条件下,将步骤(1)配制的含硅水溶液加入步骤(2)配制的含镁水溶液和步骤(3)配制的含铝水溶液的混合液中,得到晶化液。该晶化液中镁:硅:铝的摩尔比为1:1.15:0.2。
5)该晶化液放入晶化釜中,恒温150℃晶化20h,冷却后,离心,水洗,100℃干燥8h,破碎,过100目筛,得高纯镁皂石123.8g。经元素分析得到,皂石的化学组成为SiO252.43%,MgO 33.0%,Al2O3 7.6%,Na2O 3.05%,K2O 3.89%,该镁皂石化学式为Na0.76K0.64[Mg6(Si6.78Al1.16)]O20(OH)4·0.38MgO,杂质MgO含量为1.9%。图1中(c)为实施例3中的制备的镁皂石的XRD图谱。
实施例4
本实施例的一种高纯度镁皂石的制备方法,包括如下步骤:
1)按水玻璃中的硅:去离子水:氢氧化钠的摩尔比为1.0∶82.3∶1.8,将水玻璃120.0g、去离子水800g、氢氧化钠39.6g混合,配制成含硅的水溶液。
2)按镁盐中的镁:去离子水的摩尔比为1∶33.3,将六水硝酸镁128g、去离子水300g,配制成含镁的水溶液。
3)按铝盐中的铝:去离子水:氢氧化钠:碳酸氢钠:钾盐中的钾的摩尔比为1.0∶92.6∶1.5∶10.3∶1.0,将六水氯化铝36.20g、去离子水250g、氢氧化钠9.2g、碳酸氢钠130g、氯化钾11.1g混合,配制含铝的水溶液。
4)在搅拌条件下,将步骤(1)配制的含硅水溶液加入步骤(2)配制的含镁水溶液和步骤(3)配制的含铝水溶液的混合液中,得到晶化液。该晶化液中镁:硅:铝的摩尔比为1:1.08:0.3。
5)该晶化液放入晶化釜中,恒温200℃晶化24h,冷却后,离心,水洗,120℃干燥18h,破碎,过100目筛,得高纯镁皂石65g。经元素分析得到,皂石的化学组成为SiO252.58%,MgO31.99%,Al2O3 9.5%,Na2O 3.97%,K2O 0.21%,该镁皂石化学式为Na0.98K0.03[Mg6(Si6.68Al1.42)]O20(OH)4·0.07MgO,杂质MgO含量为0.36%。图1中(d)为实施例4中的制备的镁皂石的XRD图谱。
对比例
文献(R.Trujillano,E.Rico,M.A.Vicente,V.Rives,K.J.Ciuffi,A.Cestari,A.Gil,S.A.Korili,Rapid microwave-assisted synthesis of saponites and theiruse as oxidation catalysts,Applied Clay Science 2011,53,326-330)中合成MgAl皂石方法:(1)将3.60gNaOH和6.56g NaHCO3溶于50mL去离子水中,配制成缓冲溶液。(2)将水玻璃(SiO2 27wt%,密度1.39g/mL,Aldrich)加入到上述缓冲溶液中,制得A液。(3)将氯化镁和氯化铝的溶于5mL去离子水中,得到B液。(4)将B液滴加到A液中,得到晶化液。晶化液中Si、Mg、Al的质量按照[Si7Al1][Mg6]O20·(OH)4计量比加入,即5.6mL水玻璃、6.23gMgCl2·6H2O和1.22g AlCl3·6H2O。晶化液在反应釜中微波恒温180℃晶化8h,得到皂石。经元素分析得到,MgAl皂石的化学组成为SiO221.72%,MgO 22.79%,Al2O3 4.82%,Na2O 2.59%,H2O48.08%,化学式为[Si6.34Al1.66][Mg6]O20(OH)4[Na1.46Mg0.10]·34H2O·3.83Mg(OH)2。经计算该皂石含杂质Mg(OH)2为21.97%,相当于含MgO杂质15.19%。
Claims (3)
1.一种高纯度镁皂石的制备方法,其特征在于,所述方法包括如下步骤:
(1)将去离子水、水玻璃、氢氧化钠混合配制成含硅水溶液;
所述水玻璃以所含硅计与去离子水、氢氧化钠的物质的量之比为1:60-83:0.8-2;
(2)将去离子水、镁盐混合配制成含镁水溶液;
所述镁盐以所含镁计与去离子水的物质的量之比为1:17-33;
(3)将去离子水、铝盐、钾盐、氢氧化钠、碳酸氢钠混合配制成含铝水溶液;
所述铝盐以所含铝计与去离子水、氢氧化钠、碳酸氢钠、钾盐以所含钾计的物质的量之比为1:90-1865:1.3-60:5.5-120:1-50;
所述钾盐为氯化钾或硝酸钾;
(4)在搅拌条件下,先将步骤(2)配制的含镁水溶液和步骤(3)配制的含铝水溶液混合,得到混合液,再将步骤(1)配制的含硅水溶液加到所得混合液中,得到晶化液;
所述含镁水溶液所含的镁与含硅水溶液所含的硅、含铝水溶液所含的铝的物质的量之比为1:1.08-1.3:0.03-0.3;
(5)将步骤(4)所得晶化液加到晶化釜中,在100-200℃下恒温晶化6-24h,之后冷却至室温,离心、水洗、干燥、破碎、过筛,得到镁皂石。
2.如权利要求1所述的高纯度镁皂石的制备方法,其特征在于,步骤(2)中,所述镁盐为氯化镁或硝酸镁。
3.如权利要求1所述的高纯度镁皂石的制备方法,其特征在于,步骤(3)中,所述铝盐为氯化铝或硝酸铝。
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CN106315604A (zh) * | 2016-08-22 | 2017-01-11 | 浙江工业大学之江学院 | 一种含镁铝磷的硅酸盐粉体材料的制备方法 |
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CN106315604A (zh) * | 2016-08-22 | 2017-01-11 | 浙江工业大学之江学院 | 一种含镁铝磷的硅酸盐粉体材料的制备方法 |
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