Inorganic Chemicals Industry ›› 2021, Vol. 53 ›› Issue (7): 83-85.doi: 10.19964/j.issn.1006-4990.2020-0511
• Industrial Techniques • Previous Articles Next Articles
Han Zenghui1(),Zhou Qiongbo2,Xie Jianxin1,Zeng Yanping1,Cui Yunchun1,Lin Hong1
Received:
Online:
Published:
Abstract:
Sulfate impurity,which exists in phosphoric acid by dihydrate process,not only reduces the quality of phosphoric acid,but also increases the consumption of sulfuric acid by phosphoric acid.The influence of desulfurizer dosage,reaction time and reaction temperature on the desulfurization was completed,using phosphorus concentrate as desulfurizer.Meanwhile,the solubility product of calcium sulfate dihydrate in wet-process phosphoric acid was measured.The results showed that sul-fate in phosphoric acid could be removed availably,when solid-liquid mass ratio of phosphorus concentrate was 5%.It was suggested that the reaction temperature should not exceed 70 ℃ and the reaction time should be 2 h.Moreover,the solubility product of calcium sulfate in phosphoric acid was in the range of 2×10-2to 3×10-2.This study has certain guiding significance in reducing sulfate content and improving the quality of WPA production.
Key words: dilute phosphoric acid, phosphate concentrate powder, sulfate ion
CLC Number:
TQ126.35
Han Zenghui,Zhou Qiongbo,Xie Jianxin,Zeng Yanping,Cui Yunchun,Lin Hong. Experimental research on sulfate removal from wet-process phosphoric acid using phosphate concentrate[J]. Inorganic Chemicals Industry, 2021, 53(7): 83-85.
/ Recommend
Add to citation manager EndNote|Reference Manager|ProCite|BibTeX|RefWorks
URL: https://www.wjygy.com.cn/EN/10.19964/j.issn.1006-4990.2020-0511
https://www.wjygy.com.cn/EN/Y2021/V53/I7/83
Table 1
Chemical composition analysis of dilute phosphoric acid %"
Table 2
Chemical composition analysis of concentrate phosphate powder %"
Fig.1
Variation of SO42- in dilute phosphoric acid with different reaction time at 40 ℃ "
Fig.2
Variation of SO42- in dilute phosphoric acid with different reaction time at 60 ℃ and 70 ℃ "
Fig.3
Variation of SO42- in dilute phosphoric acid with different reaction time at 80 ℃ "
Table 3
Desulfurization data at different temperatures"
Table 4
Solubility product of calcium sulfate in dilute phosphoric acid"