Qiao Qing-dong
2008
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Quality indicators
Journal
Science & Technology in Chemical Industry
Abstract
In acid medium,the ferrous oxalate was prepared with ferrous ammonium sulfate and oxalic acid.Through optimizing the experiment conditions,qualitative and compositional analyzing for product,the results show that not only the number of crystal water for product which was heated 120min is access to the theory value,namely the molecular formula of the particle is FeC2O4·2.01H2O,also the yield is 96% and the mass fraction of ferric ion is 0.28%.Thermal gravimetric analysis of ferrous oxalate decomposition recorded under oxygen atmosphere indicates that the products decomposition is composed of dehydration and decomposition,which indicates that the products are the dehydrate oxalate.From 200℃,the ferrous oxalate starts to decompose,when the temperature is 300℃,the products are ferrous iron,carbon monoxide and carbon dioxide,the weight loss is 56.5%.Because the ferrous iron is unstable,a few of it is oxidized and form ferric oxide.Therefore,the self-made ferrous oxalate can be used to prepare the lithium iron phosphate and effect of its electrochemical property is satisfied.