射流强化空气氧化法制备电池级磷酸铁

doi:10.19964/j.issn.1006-4990.2024-0259

Abstract

Abstract:

The preparation of battery-grade iron phosphate using air as oxidizing agent has the problems of large particle size and low efficiency with traditional mechanical stirring reactor and bubbling reactor.In this study，it was proposed to prepare battery-grade iron phosphate by using jet-enhanced air oxidation，using a self-developed jet oxidation reactor as the experimental setup，and air as the oxidizing agent for the oxidative precipitation of ferrous dihydrogen phosphate solution.It was found that the jet-enhanced air oxidation method could preferably prepare battery-grade iron phosphate.In addition，the effects of reaction temperature，reaction time，reactant flow rate，air flow rate and pH on the particle size and yield of the product during the preparation of iron phosphate were investigated by the method of orthogonal test.The synthesized products were characterized and analyzed by X-ray diffraction，laser particle size analyzer and scanning electron microscopy.The results showed that the optimum process conditions were reaction temperature of 90 °C，reaction time of 100 min，ferrous dihydrogen phosphate solution flow rate of 10 L/min，air flow rate of 3.5 L/min，and pH of 2.0.Under these conditions，the prepared ferrous phosphoric acid was a spherical-like particle，with a high degree of crystallinity，a narrow particle size distribution，and the D₅₀ was 5.37 μm，the yield was 93.28%.

Key words: jet oxidation reactor, battery-grade iron phosphate, air oxidation

CLC Number:

TQ138.11

YU Hesong, WANG Dexi, YU Honglei, ZUO Maosheng, LI Jiazhi. Preparation of battery-grade iron phosphate by jet-enhanced air oxidation method[J]. Inorganic Chemicals Industry, 2025, 57(4): 31-36.

Figures/Tables 12

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Table 1

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Table 2

Table 3

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Table 4

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水平	A T/℃	B t/min	C Q/（L·min^-1）	D q/（L·min^-1）	E pH
1	75	60	4	2.0	1.8
2	80	80	6	2.5	1.9
3	85	100	8	3.0	2.0
4	90	120	10	3.5	2.1
5	95	140	12	4.0	2.2

序号	A	B	C	D	E	D₅₀/μm	Φ/%
1	1	1	1	1	1	8.85	60.18
2	1	2	2	2	2	9.27	72.57
3	1	3	3	3	3	9.98	84.85
4	1	4	4	4	4	8.35	89.51
5	1	5	5	5	5	10.06	83.21
6	2	1	2	3	4	6.62	74.23
7	2	2	3	4	5	6.07	86.29
8	2	3	4	5	1	9.89	86.25
9	2	4	5	1	2	7.57	81.19
10	2	5	1	2	3	10.17	78.18
11	3	1	3	5	2	6.24	84.25
12	3	2	4	1	3	3.35	85.34
13	3	3	5	2	4	5.01	89.93
14	3	4	1	3	5	8.43	79.26
15	3	5	2	4	1	11.76	82.41
16	4	1	4	2	5	2.64	81.28
17	4	2	5	3	1	5.47	84.84
18	4	3	1	4	2	8.77	84.37
19	4	4	2	5	3	8.43	90.85
20	4	5	3	1	4	4.58	87.61
21	5	1	5	4	3	4.53	91.37
22	5	2	1	5	4	8.31	83.73
23	5	3	2	1	5	4.61	76.55
24	5	4	3	2	1	7.52	83.56
25	5	5	4	3	2	6.15	92.04
k₁（D₅₀）	9.302	5.776	8.906	5.792	8.698
k₂（D₅₀）	8.064	6.494	8.138	6.922	7.600
k₃（D₅₀）	6.958	7.652	6.878	7.330	7.292
k₄（D₅₀）	5.978	8.060	6.076	7.896	6.574
k₅（D₅₀）	6.224	8.544	6.528	8.586	6.362
R（D₅₀）	3.324	2.768	2.830	2.794	2.336
k₁（Φ）	78.064	78.262	77.144	78.174	79.448
k₂（Φ）	81.228	82.554	79.322	81.104	82.884
k₃（Φ）	84.238	84.390	85.312	83.044	86.118
k₄（Φ）	85.790	84.874	86.884	86.790	85.002
k₅（Φ）	85.450	84.690	86.108	85.658	81.318
R（Φ）	7.726	6.612	9.740	8.616	6.670

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Inorganic Acid-Base-Salt Committee of CIESC

Preparation of battery-grade iron phosphate by jet-enhanced air oxidation method

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水平	A T/℃	B t/min	C Q/（L·min^-1）	D q/（L·min^-1）	E pH
1	75	60	4	2.0	1.8
2	80	80	6	2.5	1.9
3	85	100	8	3.0	2.0
4	90	120	10	3.5	2.1
5	95	140	12	4.0	2.2

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水平	A T/℃	B t/min	C Q/（L·min^-1）	D q/（L·min^-1）	E pH
1	75	60	4	2.0	1.8
2	80	80	6	2.5	1.9
3	85	100	8	3.0	2.0
4	90	120	10	3.5	2.1
5	95	140	12	4.0	2.2

水平	A T/℃	B t/min	C Q/（L·min^-1）	D q/（L·min^-1）	E pH
1	75	60	4	2.0	1.8
2	80	80	6	2.5	1.9
3	85	100	8	3.0	2.0
4	90	120	10	3.5	2.1
5	95	140	12	4.0	2.2