CN111573724A - 一种制备纳米钛白粉的方法 - Google Patents
一种制备纳米钛白粉的方法 Download PDFInfo
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- titanium dioxide
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- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 38
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000002002 slurry Substances 0.000 claims abstract description 71
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 43
- 239000002253 acid Substances 0.000 claims abstract description 42
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002270 dispersing agent Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 17
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 16
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims abstract description 16
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 16
- 239000004202 carbamide Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 235000019837 monoammonium phosphate Nutrition 0.000 claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000012065 filter cake Substances 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 9
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000001704 evaporation Methods 0.000 claims abstract description 7
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 3
- -1 fatty acid ester Chemical class 0.000 claims description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 10
- 239000000194 fatty acid Substances 0.000 claims description 10
- 229930195729 fatty acid Natural products 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- 229920000223 polyglycerol Polymers 0.000 claims description 9
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 8
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 229940103272 aluminum potassium sulfate Drugs 0.000 claims description 4
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 3
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 3
- 235000011151 potassium sulphates Nutrition 0.000 claims description 3
- 238000011085 pressure filtration Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003546 flue gas Substances 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 7
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 3
- 235000013877 carbamide Nutrition 0.000 description 13
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 235000019864 coconut oil Nutrition 0.000 description 2
- 239000003240 coconut oil Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- HLERILKGMXJNBU-UHFFFAOYSA-N norvaline betaine Chemical compound CCCC(C([O-])=O)[N+](C)(C)C HLERILKGMXJNBU-UHFFFAOYSA-N 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 2
- 239000001038 titanium pigment Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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Abstract
本发明公开了一种制备纳米钛白粉的方法，将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为150‑250g/L的偏钛酸浆液；在偏钛酸浆液加入硫酸盐、尿素和磷酸二氢铵，升温至60‑80℃，搅拌均匀，静置2‑4h，再用氨水中和至pH至6.5‑7.5之间，得水解浆料；在水解浆料中加热至80‑100℃，再加入与水解将料体积比为0.5‑1:1的浓盐酸，加压进行溶胶反应，反应结束加氨水中和至pH为6‑7，得纳米钛白粉浆料；在纳米钛白粉浆料中加入分散剂，经压滤机压滤，压榨后的滤饼通过闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。本发明方法制得的钛白粉粒径分布在20‑30nm，比表面积为370‑420cm2/g，水分散性达到98%以上，应用在烟气脱硝中，具有很好的催化效果。
Description
技术领域
本发明属于钛白粉生产技术领域，具体是一种制备纳米钛白粉的方法。
背景技术
钛白粉即二氧化钛，是一种重要的无机化工原料。因其无毒、物理化学性质稳定，具有优良的光学、电学特性和卓越的颜料性能，广泛应用在涂料、油墨、塑料、橡胶、造纸、化纤、美术颜料、日用化妆品、搪瓷、陶瓷、电子等领域中。钛白粉的生产方法主要为硫酸法，是将钛铁粉与浓硫酸进行酸解反应生成中间体硫酸氧钛，硫酸氧钛需水解成偏钛酸和硫酸，偏钛酸再经水洗、煅烧、粉碎等工艺得到钛白粉产品。
烟气脱硝催化反应是一个表面反应，反应的速度取决于反应物与催化剂接触的表面接触程度。钛白粉的光催化能力主要取决于其表面积，对于催化剂钛白粉而言，比表面积越大，TiO2的含量越高，杂质含量越低，催化效果越好，这是衡量钛白粉质量的最重要指标。而常规硫酸法制备的钛白粉比表面积多在60～ 100m2/g，且存在生产成本高、催化效果差、使用寿命短等缺陷。由于纳米钛白粉的粒度较小，分散性较差，易发生团聚。因此，研究具有较大比表面积、较小粒度、分散性好的钛白粉时提高烟气脱硝催化效果的有效途径。
发明内容
本发明为了解决现有钛白粉比表面积小、易团聚等问题，提供一种制备纳米钛白粉的方法。本方法制备的纳米钛白粉具有大比表面积、粒径达到纳米级别、分散性好等优点，应用在烟气脱硝中，具有很好的催化效果。
为了实现以上目的，本发明采用的技术方案如下：
一种制备纳米钛白粉的方法，包括如下步骤：
(1)将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为150-250g/L的偏钛酸浆液；
(2)在偏钛酸浆液加入硫酸盐、尿素和磷酸二氢铵，升温至60-80℃，搅拌均匀，静置2-4h，再用氨水中和至pH至6.5-7.5之间，得水解浆料；所述硫酸盐、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为1-3％、0.5-1.5％和0.5-1.5％；
(3)在水解浆料中加热至80-100℃，再加入与水解将料体积比为0.5-1:1的浓盐酸，加压进行溶胶反应，反应结束加氨水中和至pH为6-7，得纳米钛白粉浆料；
(4)在纳米钛白粉浆料中加入分散剂，经压滤机压滤，压榨后的滤饼通过闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
进一步地，所述分散剂由椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成。优选地，所述分散剂以浆料中二氧化钛重量计，加入量为0.5-2.0％。优选地，所述分散剂中椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇的质量比为1-3:1-3:3-5。
进一步地，所述溶胶反应是在温度为100-120℃、压力为0.4-0.6MPa下反应 1-3h。
进一步地，步骤(1)和步骤(4)所述压滤是压滤至固含量为50-60％。
进一步地，所述闪蒸干燥控制温度在400-500℃。
进一步地，所述硫酸盐为硫酸钠、硫酸钾、硫酸铝钾和硫酸铝中的一种或多种组合物。
与现有技术相比，本发明的优点及有益效果为：
1、本发明方法制得的钛白粉粒径分布在20-30nm，比表面积为 370-420cm2/g，水分散性达到98％以上，应用在烟气脱硝中，具有很好的催化效果。
2、本方法在偏钛酸浆液加入硫酸盐、尿素和磷酸二氢铵，并通过溶胶反应，不仅能够控制钛白粉能够达到纳米级别，制得的产品粒径分布窄，还能扩大钛白粉的孔径，增大比表面积。
3、本发明方法加入由椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成的分散剂，能够显著提高钛白粉的分散性，解决了现有钛白粉易团聚导致的催化效率低的问题。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明。应该强调的是，下述说明仅仅是示例性的，而不是为了限制本发明的范围及其应用。
实施例1
一种制备纳米钛白粉的方法，包括如下步骤：
(1)将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为200g/L的偏钛酸浆液；
(2)在偏钛酸浆液加入硫酸铝钾、尿素和磷酸二氢铵，升温至70℃，搅拌均匀，静置3h，再用氨水中和至pH至7.0，得水解浆料；所述硫酸盐、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为2％、1.2％和0.8％；
(3)在水解浆料中加热至90℃，再加入与水解将料体积比为1:2的浓盐酸，加压进行溶胶反应，在温度为110℃、压力为0.5MPa下反应2.5h，反应结束加氨水中和至pH为6.5，得纳米钛白粉浆料；
(4)在纳米钛白粉浆料中加入以浆料中二氧化钛重量计加入量为1.2％的分散剂，所述分散剂由质量比为2:1:3的椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成，经压滤机压滤至固含量为55％，压榨后的滤饼在温度为450℃闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
实施例2
一种制备纳米钛白粉的方法，包括如下步骤：
(1)将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为150g/L的偏钛酸浆液；
(2)在偏钛酸浆液加入硫酸铝、尿素和磷酸二氢铵，升温至65℃，搅拌均匀，静置2h，再用氨水中和至pH至6.5，得水解浆料；所述硫酸盐、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为1.5％、0.8％和1.2％；
(3)在水解浆料中加热至100℃，再加入与水解将料体积比为1:1的浓盐酸，加压进行溶胶反应，在温度为120℃、压力为0.4MPa下反应2h，反应结束加氨水中和至pH为6.5，得纳米钛白粉浆料；
(4)在纳米钛白粉浆料中加入以浆料中二氧化钛重量计加入量为1.8％的分散剂，所述分散剂由质量比为1:1:4的椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成。经压滤机压滤至固含量为60％，压榨后的滤饼在温度为500℃闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
实施例3
一种制备纳米钛白粉的方法，包括如下步骤：
(1)将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为250g/L的偏钛酸浆液；
(2)在偏钛酸浆液加入硫酸钠、尿素和磷酸二氢铵，升温至80℃，搅拌均匀，静置3h，再用氨水中和至pH至7.0，得水解浆料；所述硫酸盐、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为2％、1％和0.8％；
(3)在水解浆料中加热至90℃，再加入与水解将料体积比为1:1的浓盐酸，加压进行溶胶反应，在温度为110℃、压力为0.5MPa下反应2.5h，反应结束加氨水中和至pH为6.5，得纳米钛白粉浆料；
(4)在纳米钛白粉浆料中加入以浆料中二氧化钛重量计加入量为0.8％的分散剂，所述分散剂由质量比为3:2:5的椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成.经压滤机压滤至固含量为55％，压榨后的滤饼在温度为400℃闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
实施例4
一种制备纳米钛白粉的方法，包括如下步骤：
(1)将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为200g/L的偏钛酸浆液；
(2)在偏钛酸浆液加入硫酸钾、尿素和磷酸二氢铵，升温至70℃，搅拌均匀，静置4h，再用氨水中和至pH至6.5，得水解浆料；所述硫酸钠、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为3％、0.6％和1.2％；
(3)在水解浆料中加热至100℃，再加入与水解将料体积比为1:1.5的浓盐酸，加压进行溶胶反应，在温度为100℃、压力为0.6MPa下反应3h，反应结束加氨水中和至pH为7.0，得纳米钛白粉浆料；
(4)在纳米钛白粉浆料中加入以浆料中二氧化钛重量计加入量为1.5％的分散剂，所述分散剂由质量比为1:1:3的椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成。经压滤机压滤至固含量为50％，压榨后的滤饼在温度为450℃闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
实施例5
一种制备纳米钛白粉的方法，包括如下步骤：
(1)将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为250g/L的偏钛酸浆液；
(2)在偏钛酸浆液加入硫酸铝钾、尿素和磷酸二氢铵，升温至80℃，搅拌均匀，静置3h，再用氨水中和至pH至7.5，得水解浆料；所述硫酸钠、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为1.5％、1％和1％；
(3)在水解浆料中加热至120℃，再加入与水解将料体积比为1:1的浓盐酸，加压进行溶胶反应，在温度为120℃、压力为0.5MPa下反应2h，反应结束加氨水中和至pH为7.0，得纳米钛白粉浆料；
(4)在纳米钛白粉浆料中加入以浆料中二氧化钛重量计加入量为2％的分散剂，所述分散剂由质量比为2:3:3的椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成。经压滤机压滤至固含量为60％，压榨后的滤饼在温度为400℃闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
将实施例1-5制得的钛白粉经过常规方法检测比表面积、粒径大小及分散性，测试结果如表1所示。
表1：本发明制得的纳米钛白粉的性能检测结果
| 产品 | 比表面积(cm<sup>2</sup>/g) | 平均粒径(nm) | 水分散性(％) |
| 实施例1 | 397 | 25.6 | 98.46 |
| 实施例2 | 416 | 23.4 | 99.03 |
| 实施例3 | 371 | 27.1 | 98.11 |
| 实施例4 | 385 | 21.2 | 98.97 |
| 实施例5 | 409 | 27.4 | 99.14 |
本发明制得的纳米钛白粉具有大比表面积、粒径达到纳米级别、分散性好等优点。
将本发明实施例1-5制得的钛白粉应用在烟气脱硝中，钛白粉在烟气条件为950ppm NOx、3.2％O2、165ppm SO2，气体流速为300ml/min、温度为450下℃进行反应。实施例1-5的脱硝率分别为：98.64％、99.17％、98.26％、98.18％和 98.74％。
以上内容是结合具体的/优选的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，其还可以对这些已描述的实施例做出若干替代或变型，而这些替代或变型方式都应视为属于本发明的保护范围。
Claims (8)
1.一种制备纳米钛白粉的方法，其特征在于：包括如下步骤：
（1）将硫酸法制得的偏钛酸，经水洗，压滤机压滤，再加水调至成二氧化钛浓度为150-250g/L的偏钛酸浆液；
（2）在偏钛酸浆液加入硫酸盐、尿素和磷酸二氢铵，升温至60-80℃，搅拌均匀，静置2-4h，再用氨水中和至pH至6.5-7.5之间，得水解浆料；所述硫酸盐、尿素和磷酸二氢铵的加入量以偏钛酸浆液中的二氧化钛计，分别为1-3%、0.5-1.5%和0.5-1.5%；
（3）在水解浆料中加热至80-100℃，再加入与水解将料体积比为0.5-1:1的浓盐酸，加压进行溶胶反应，反应结束加氨水中和至pH为6-7，得纳米钛白粉浆料；
（4）在纳米钛白粉浆料中加入分散剂，经压滤机压滤，压榨后的滤饼通过闪蒸干燥，利用汽流粉碎机粉碎，得纳米钛白粉。
2.根据权利要求1所述制备纳米钛白粉的方法，其特征在于：所述分散剂由椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇组成。
3.根据权利要求2所述制备纳米钛白粉的方法，其特征在于：所述分散剂以浆料中二氧化钛重量计，加入量为0.5-2.0%。
4.根据权利要求2所述制备纳米钛白粉的方法，其特征在于：所述分散剂中椰子油酰胺丙基甜菜碱、聚甘油脂肪酸酯和聚乙二醇的质量比为1-3:1-3:3-5。
5.根据权利要求1所述纳米钛白粉的方法，其特征在于：所述溶胶反应是在温度为100-120℃、压力为0.4-0.6MPa下反应1-3h。
6.根据权利要求1所述制备纳米钛白粉的方法，其特征在于：步骤（1）和步骤（4）所述压滤是压滤至固含量为50-60%。
7.根据权利要求1所述制备纳米钛白粉的方法，其特征在于：所述闪蒸干燥控制温度在400-500℃。
8.根据权利要求1所述制备纳米钛白粉的方法，其特征在于：所述硫酸盐为硫酸钠、硫酸钾、硫酸铝钾和硫酸铝中的一种或多种组合物。
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Application publication date: 20200825 |