CIESC Journal ›› 2020, Vol. 71 ›› Issue (10): 4792-4799.doi: 10.11949/0438-1157.20200672

• Energy and environmental engineering • Previous Articles     Next Articles

Research on leaching rate enhancement and organic matter removal in wet-process phosphoric acid

Changyuan TAO1,2(),Xiuxiu WANG1,2,Zuohua LIU1,2,Renlong LIU1,2,Jinhua LUAN3   

  1. 1.Schollge of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
    2.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    3.Chongqing Institute of Geology and Mineral Resources, Chongqing 400044, China
  • Received:2020-06-03 Revised:2020-07-14 Online:2020-10-05 Published:2020-07-16
  • Contact: Changyuan TAO E-mail:taocy@cqu.edu.cn

Abstract:

In the process of wet-process phosphoric acid leaching, the product phosphoric acid appears black due to the incomplete carbonization of some organic matter. A novel type of catalytic oxidation wet-process phosphoric acid purification technology was proposed in this work. During the leaching process, the oxidant (H2O2) and catalyst (MnO2) was added to form the peroxides such as ·OH and HO2· in the transformation process, which can enhance the removal rate of organic matter and strengthen the leaching rate of phosphate rock. The different reaction conditions that affected the leaching rate of wet-phosphoric acid and the removal of organic matter were investigated. The results indicated that 96.9% of phosphate rock were leached under the optimum conditions of H2O2 dosage 0.08 ml/g, MnO2/P mass ratio of 0.04, 80℃ and for 40 min. At the same time, the TOC remove rate reached 79%. The analysis mechanism showed that H2O2 will form H3PO4 · H2O2 peroxide with H3PO4 in the solution, and MnO2 will react with it like Fenton to generate a large amount of ·OH, and then fully oxidized the black organic matter into CO2 and H2O. Organic matter “wrapped” on the surface of the phosphate rock is broken by ·OH, which promoted the leaching of phosphoric acid and enhanced the removal of organic matter.

Key words: wet-process phosphoric acid, black organic matter, catalytic oxidation

CLC Number: 

  • TQ 126.3

Fig.1

XRD pattern of phosphate rock"

Table1

Composition of phosphate rock"

成分含量/%(mass)
Ca60.98
P20.36
Si7.19
F4.29
Mg2.83
Fe2.01
Al0.78
K0.43
S0.37

Fig.2

Schematic diagram of experimental process"

Fig.3

Effect of leaching time on leaching rate"

Fig.4

Effect of the leaching temperature on leaching rate"

Fig.5

Effect of mass of H2O2 on phosphorite leaching"

Fig.6

Effect of mass of MnO2 on phosphorite leaching"

Fig.7

Change rule of TOC removal rate"

Fig.8

XRD patterns of phosphate rock under different extraction conditions a—original phosphate rock; b—direct acid extraction; c—H2O2 extraction; d—MnO2 extraction; e—H2O2with MnO2 extraction"

Fig.9

SEM images of phosphate rock under different extraction conditions"

Fig.10

Mechanism of organic matter removal by catalytic oxidation"

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