工业磷酸分解磷矿影响因素及副产物性质研究

Abstract

Abstract:

In order to improve the wet phosphoric acid process,enhance the quality of by-product phosphogypsum and reduce the economic and environmental pressure caused by the accumulation of solid by-products of wet phosphoric acid,an experiment was carried out to produce phosphoric acid from industrial phosphoric acid decomposing phosphate rock,at the same time,the properties of solid by-products were analyzed.The process of decomposing phosphate rock to phosphoric acid by industrial phosphoric acid was divided into two steps：The first step was the reaction of industrial phosphoric acid with phosphate rock to obtain calcium dihydrogen phosphate solution and acid-insoluble slag.The second step was to the reaction of concentrated sulfuric acid with calcium dihydrogen phosphate solution to obtain phosphoric acid solution and high purity gypsum.The effects of acid ratio（the amount-of-substance ratio of industrial phosphoric acid dosage to theortical phosphoric acid dosage）,phosphate rock particle size,reaction temperature and reaction time on leaching rate were investigated by single factor test.The results showed that the suitable technological conditions for acidolysis of phosphate rock were as follows：the acid ratio was 6.8,grinding fineness less than 0.074 mm accounted for 60%,reaction temperature was 50 ℃,reaction time was 2.5 h.The leaching rate of phosphorus in phosphate rock after acid hydrolysis could reach 87.69%.In the solid by-products produced after the reaction,the mass fraction of high-purity gypsum was 35.32%,and the mass fraction of acid-insoluble slag was 64.68%.The purity of CaSO₄·2H₂O in high-purity gypsum was 95.80%,which was of high value for industrial use and was beneficial to increase the utilization of solid by-products of wet-process phosphoric acid.

Key words: industrial phosphoric acid, phosphate rock decomposition, wet-process phosphoric acid, by-product phosphogyp-sum, high-purity gypsum

CLC Number:

TQ126.35

Shao Yixin,Zhang Zeqiang,Huang Chaode,Sun Hualin. Research on influencing factors of industrial phosphoric acid decomposing phosphate rock and properties of by-products[J]. Inorganic Chemicals Industry, 2019, 51(6): 49-52.

Figures/Tables 9

References 15

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主要成分	质量浓度/（mg·mL^-1）	主要成分	质量浓度/（mg·mL^-1）
P₂O₅	264.11	Fe₂O₃	3.88
CaO	0.89	SiO₂	0.418
MgO	5.18	SO₃	21.73
Al₂O₃	13.72

主要成分	质量分数/%	主要成分	质量分数/%
P₂O₅	24.96	Fe₂O₃	2.59
CaO	39.82	SiO₂	19.57
MgO	0.78	SO₂	2.86
Al₂O₃	4.66	其他	4.76

磷矿粒级	磷浸出率/%	磷矿粒级	磷浸出率/%
<2 mm	33.82	80%-0.074mm	65.22
60%-0.074 mm	56.21	90%-0.074 mm	68.38
70%-0.074 mm	59.61

主要成分	质量分数/%	主要成分	质量分数/%
MgO	0.19	CaO	21.44
Al₂O₃	5.86	Fe₂O₃	1.84
SiO₂	21.96	结晶水	12.26
P₂O₅	3.41	其他	1.51
SO₃	30.85

主要成分	质量分数/%	主要成分	质量分数/%
Na₂O	0.125	K₂O	0.018
Al₂O₃	0.152	CaO	32.503
SiO₂	0.041	SrO	0.141
P₂O₅	1.851	BaO	0.035
SO₃	42.064	其他	23.071

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Research on influencing factors of industrial phosphoric acid decomposing phosphate rock and properties of by-products

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主要成分	质量分数/%	主要成分	质量分数/%
CaO	32.11	结晶水	21.04
SO₃	44.56	其他	0.94
P₂O₅	1.35	CaSO₄·2H₂O	95.80

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