Reaction behavior and mechanism of anatase in digestion process of diasporic bauxite
Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic...
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| Published in | Transactions of Nonferrous Metals Society of China Vol. 20; no. 1; pp. 142 - 146 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
2010
School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1003-6326 |
| DOI | 10.1016/S1003-6326(09)60111-4 |
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| Abstract | Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na2TiO3, then the resultant Na2TiO3 reacts with 3CaO·Al2O3·6H2Oresulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO2·H2O which eventually converts into CaTiO3. Higher temperature, concentration of free Na2Ok （the caustic soda uncombined with aluminate anions in the form of Na2O） and molar ratio of CaO to TiO2 are favorable to the conversion of CaO·2TiO2·H2O to CaTiO3. And Al（OH）4^- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite. |
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| AbstractList | TG1; Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na_2TiO_3, then the resultant Na_2TiO_3 reacts with 3CaO·Al_2O_3·6H_2O resulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO_2·H_2O which eventually converts into CaTiO_3. Higher temperature, concentration of free Na_2O_k (the caustic soda uncombined with aluminate anions in the form of Na_2O) and molar ratio of CaO to TiO_2 are favorable to the conversion of CaO·2TiO_2·H_2O to CaTiO_3. And Al(OH)_4~- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite. Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na 2TiO 3, then the resultant Na 2TiO 3 reacts with 3CaO·Al 2O 3·6H 2O resulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO 2·H 2O which eventually converts into CaTiO 3. Higher temperature, concentration of free Na 2O k (the caustic soda uncombined with aluminate anions in the form of Na 2O) and molar ratio of CaO to TiO 2 are favorable to the conversion of CaO·2TiO 2·H 2O to CaTiO 3. And Al(OH) 4 − shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite. Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na2TiO3, then the resultant Na2TiO3 reacts with 3CaO·Al2O3·6H2Oresulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO2·H2O which eventually converts into CaTiO3. Higher temperature, concentration of free Na2Ok （the caustic soda uncombined with aluminate anions in the form of Na2O） and molar ratio of CaO to TiO2 are favorable to the conversion of CaO·2TiO2·H2O to CaTiO3. And Al（OH）4^- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite. Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na sub(2)TiO sub(3), then the resultant Na sub(2)TiO sub(3) reacts with 3CaO super(.Al) sub(2) sub(3) super(.6H) sub(2) resulting from the reaction of CaO with sodium aluminate solution to produce CaO super(.2TiO) sub(2)u.H sub(2)O which eventually converts into CaTiO sub(3). Higher temperature, concentration of free Na sub(2)O sub(k) (the caustic soda uncombined with aluminate anions in the form of Na sub(2)O) and molar ratio of CaO to TiO sub(2) are favorable to the conversion of CaO super(.2TiO) sub(2)u.H sub(2)O to CaTiO sub(3). And Al(OH) sub(4) super(-) shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite. |
| Author | 李小斌 付伟岸 周秋生 刘桂华 彭志宏 |
| AuthorAffiliation | School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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| CitedBy_id | crossref_primary_10_1016_j_hydromet_2014_04_021 crossref_primary_10_1016_j_jhazmat_2011_03_004 crossref_primary_10_1039_C3EN00103B crossref_primary_10_1016_j_jece_2024_115269 crossref_primary_10_1016_S1003_6326_24_66639_2 crossref_primary_10_1016_j_hydromet_2013_09_009 crossref_primary_10_1016_j_hydromet_2015_01_001 crossref_primary_10_1021_ie402867n crossref_primary_10_1016_j_hydromet_2017_02_001 crossref_primary_10_1007_s12598_016_0710_y crossref_primary_10_1039_c3em30880d crossref_primary_10_1016_j_hydromet_2010_05_011 |
| Cites_doi | 10.1016/j.ccr.2008.01.012 10.1016/j.jnoncrysol.2007.10.037 10.1016/0304-386X(87)90010-7 10.1016/S0304-386X(98)00075-9 |
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| Keywords | hydroxy calcium titanate high-pressure digestion calcium titanate reaction mechanism anatase |
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| SubjectTerms | Al2O3 Aluminum base alloys Anatase Bauxite Bayer process calcium titanate Caustic soda Digestion high-pressure digestion hydroxy calcium titanate reaction mechanism Sodium hydroxide Titanium dioxide 反应机制 消化过程 铝土矿 铝酸钠溶液 锐钛型 |
| Title | Reaction behavior and mechanism of anatase in digestion process of diasporic bauxite |
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