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A New Method of Potassium Chromate Production from Chromite and KOH-KNO3-H2O Binary Submolten Salt System
Sun, Zhi1; Zhang, Yi1; Zheng, Shi-Li1; Zhang, Yang1,2; Zhang, Y
2009-10-01
Source PublicationAICHE JOURNAL
ISSN0001-1541
Volume55Issue:10Pages:2646-2656
AbstractA new method of chromate production by applying a new reaction system of KOH-KNO3-H2O (binary submolten salt system) is proposed and proved feasible. Under conditions of temperature 350 degrees C, KOH-to-chromite ore ratio 2:1, stirring speed 700 rpm, KNO3-to-chromite ore ratio 0.8:1, oxygen partial pressure 50%, and gas flow 1 L/min, chromium conversion ratio obtained is >98% with reaction time around 300 min. The decomposition of chromite ore in the system is a typical process of solid-liquid-gas reaction, which is coordinately controlled by mass diffusion in product layer and interface reaction. Apparent activation energy of decomposition in the temperature range from 280 to 370 degrees C is 55.63 kJ/mol. During reaction, oxygen dissolves into KOH-KNO3-H2O melt system first and some cluster, e.g. O-2(2-), is formed and the mass diffusion 2 coefficient of the cluster was calculated. The system can be considered as both a media of oxygen transportation and reactant donator. Potassium nitrate plays a role of catalyst in the oxidation decomposition reaction of chromite ore and potassium hydroxide. (C) 2009 American Institute of Chemical Engineers AIChE J, 55: 2646-2656, 2009
KeywordChromite Ore Potassium Chromate Mechanism Decomposition Submolten Salt
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1002/aic.11871
Indexed BySCI
Language英语
WOS KeywordMANUFACTURING PROCESS ; KINETICS ; OXYCHLORINATION ; DECOMPOSITION ; HYDROXIDE ; ORE
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000270503300014
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6569
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorZhang, Y
Affiliation1.Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Coll Chem & Chem Engn, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Sun, Zhi,Zhang, Yi,Zheng, Shi-Li,et al. A New Method of Potassium Chromate Production from Chromite and KOH-KNO3-H2O Binary Submolten Salt System[J]. AICHE JOURNAL,2009,55(10):2646-2656.
APA Sun, Zhi,Zhang, Yi,Zheng, Shi-Li,Zhang, Yang,&Zhang, Y.(2009).A New Method of Potassium Chromate Production from Chromite and KOH-KNO3-H2O Binary Submolten Salt System.AICHE JOURNAL,55(10),2646-2656.
MLA Sun, Zhi,et al."A New Method of Potassium Chromate Production from Chromite and KOH-KNO3-H2O Binary Submolten Salt System".AICHE JOURNAL 55.10(2009):2646-2656.
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