Inorganic Chemicals Industry >
Study on decomposition rate of phosphorus pentoxide and migration distribution of associated iodine in acidolysis process of calcinating phosphate concentrate ore with nitric acid
Received date: 2020-10-14
Online published: 2021-04-23
The medium-low grade sedimentary phosphorite phosphate rock could only be used for production of wet phosphoric acid after beneficiation.It is difficult for flotation phosphate concentrate ore to fully meet the requirements of production of nitrophosphate while roasting phosphate concentrate is more suitable for production of nitrophosphate.The effects of technological parameters on the decomposition rate of phosphorus pentoxide and the three-phase migration distribution of associated iodine in the process of nitric acid acidolysis calcinating phosphorus concentrate ore were studied which were compared with the experimental results of nitric acid acidolysis phosphorus concentrate ore flotation.The results showed that under the conditions as follows: acidolysis temperature was 60 ℃, acidolysis time was 50 min, mass fraction of nitric acid was 55% and acidolysis ratio was 1.2, the decomposition rate of phosphorus pentoxide in calcinating phosphate ore concentrate reached 97.85%.At the same acidolysis temperature of 60 ℃, the decomposition rate of phosphorus pentoxide of calcinating phosphorus concentrate ore was higher than that of floating phosphorus concentrate ore, while other acidolysis process parameters were significantly lower than that of floating phosphorus concentrate ore.Most of the iodine associated with the two kinds of phosphate rocks sublimates to the gas phase, but the iodine associated with the roasted phosphate concentrate ore was easier to sublimate.
Yulu Li , Fei Zhou , Ping Yang , Junqiang Feng , Deming Huang , Qian Lin . Study on decomposition rate of phosphorus pentoxide and migration distribution of associated iodine in acidolysis process of calcinating phosphate concentrate ore with nitric acid[J]. Inorganic Chemicals Industry, 2021 , 53(4) : 38 -42 . DOI: 10.11962/1006-4990.2020-0320
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