Inorganic Chemicals Industry >
Study on defluorination of phosphoric acid by nitric acid process
Received date: 2020-12-09
Online published: 2021-09-08
In view of the problem that the m（P2O5）/m（F） of dicalcium phosphate prepared from wet process phosphoric acid by nitric acid method was quite low,the effect of reaction time,reaction temperature,reaction pH,concentration of P2O5 and CaO in acidolysis solution on the precipitation rate of P2O5 and m（P2O5）/m（F） was investigated by batch experiments using chemical precipitation method with calcium salt as defluorination agent.The results showed that the change of reaction time and temperature had little effect on the precipitation rate of P2O5 and m（P2O5）/m（F） of the solution,but reducing the concen-tration of P2O5 and CaO could effectively improve the m（P2O5）/m（F） and reduce the precipitation rate of P2O5.By comparing the benefits of defluorination solution to prepare feed grade dicalcium phosphate,giving the optimal operation conditions were as follows：reaction temperature was 40 ℃,reaction time was 20 min,concentration of P2O5 and CaO was 7.6% and 3.4%,respectively,and neutralization pH was 2.4%.Under these conditions,the m（P2O5）/m（F） was above 230,and the precipitation rate of P2O5 was less than 30%,and it could provide qualified raw materials for subsequent preparation of feed grade dicalcium phosphate.
Shu Su , Dehua Xu , Chaorong Li , Xiushan Yang , Xinlong Wang , Zhiye Zhang . Study on defluorination of phosphoric acid by nitric acid process[J]. Inorganic Chemicals Industry, 2021 , 53(9) : 24 -29 . DOI: 10.19964/j.issn.1006-4990.2020-0605
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