磷精矿脱除湿法稀磷酸中硫酸根的实验研究

doi:10.19964/j.issn.1006-4990.2020-0511

Abstract

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.

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w（P₂O₅）	w（SO₄^2-）	w（Fe₂O₃）	w（Al₂O₃）	w（MgO）
26.21	2.11	0.71	0.80	0.64
w（CaO）	w（Na₂O）	w（K₂O）	w（As）
0.20	0.048	0.038	0.001 7

反应温度/℃	反应2.0 h		反应2.5 h
反应温度/℃	w（硫酸根）/ %	脱硫率/ %	w（硫酸根）/ %	脱硫率/ %
40	0.444 4	78.94	0.393 8	81.33
60	0.434 2	79.42	0.404 7	80.82
70	0.437 0	79.28	0.420 7	80.06
80	0.517 1	75.49	0.519 9	75.36

反应温度/℃	c（Ca²⁺）/（mol·L^-1）	c（SO₄^2-）/（mol·L^-1）	K_sp/10^-2
40	0.354 0	0.058 1	2.06
60	0.360 1	0.063 5	2.28
70	0.362 8	0.067 9	2.46
80	0.340 3	0.083 5	2.84

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Experimental research on sulfate removal from wet-process phosphoric acid using phosphate concentrate

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