磷石膏循环流化床煅烧分解工艺可行性分析

doi:10.19964/j.issn.1006-4990.2022-0546

Abstract

Abstract:

Phosphogypsum produced from phosphoric acid production，as industrial solid wastes，can be used for the production of sulfuric acid and calcium based materials，which is a sustainable technological route.The process of phosphogypsum decomposition in the coal-fired circulating fluidized bed to produce sulfuric acid and calcium-based materials after granulation was presented.The feasibility of the process was verified from the aspects of the mass energy balance of the process and the decomposition desulfurization performance of phosphogypsum calcined from coal under different working conditions.Thermodynamic calculation results showed that the process could realize self heating operation.CaO was generated from the decomposition and desulfurization of calcined phosphogypsum.O₂/H₂O and O₂/CO₂ were suitable fluidization and oxidation media.The volume fraction of SO₂ in the dry gas at the reactor outlet could reach 33%，which was suitable for sulfuric acid production.The excessive reducing weak oxidizing atmosphere could realize the decomposition and desulfurization of phosphogypsum at 1 100 ℃，which was lower than the existing decomposition process temperature of phosphogypsum.Under the reaction conditions of 1 100 ℃，phosphogypsum/coal mass ratio of 4∶1，O₂/CO₂ or O₂/H₂O with 1% O₂ volume fraction，the main components of solid residue were CaO，CaO·CaSiO₃.The research results preliminarily showed that the technology of phosphogypsum calcination and decomposition by circulating fluidized bed to produce sulfuric acid and calcium based materials was feasible.

Key words: phosphogypsum, calcium-based materials, decomposition and desulphurization, circulating fluidized bed

CLC Number:

TQ126.3

ZHANG Lei, LI Meng, XIANG Wenguo, HU Jun, CHEN Shiyi, DUAN Lunbo. Feasibility analysis of calcination and decomposition process of phosphogypsum in circulating fluidized bed[J]. Inorganic Chemicals Industry, 2023, 55(6): 85-91.

Figures/Tables 13

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工况	磷石膏/ g	煤/ g	反应气	温度/ ℃	时长/ min
1	1	—	5.5 mL/min CO，177 mL/min N₂	1 100	30
2	1	—	5.5 mL/min CO，177 mL/min N₂	1 100	60
3	1	—	11 mL/min CO，355 mL/min N₂	1 100	30
4	1	—	16.5 mL/min CO，533 mL/min N₂	1 100	30
5	1	0.1	90 mL/min N₂	1 100	30
6	1	0.25	90 mL/min N₂	1 100	30
7	1	0.25	90 mL/min CO₂	1 100	30
8	1	0.25	4 mL/min O₂，396 mL/min CO₂	1 100	30
9	1	0.25	4 mL/min O₂，396 mL/min CO₂	1 000	30
10	1	0.25	4 mL/min O₂，396 mL/min CO₂	1 050	30
11	1	0.25	4 mL/min O₂，396 mL/min CO₂	1 100	20
12	1	0.25	4 mL/min O₂，396 mL/min CO₂	1 100	40
13	1	0.25	4 mL/min O₂，396 mL/min N₂	1 100	30
14	1	0.2	4 mL/min O₂，396 mL/min CO₂	1 100	30
15	1	0.222	4 mL/min O₂，396 mL/min CO₂	1 100	30
16	1	0.286	4 mL/min O₂，396 mL/min CO₂	1 100	30

工况条件	气化介质	磷石膏量/ （t∙d^-1）	反应温度/ ℃	生成烟气量/ （m³∙s^-1）	煤耗量/ （t∙d^-1）	氧耗量/ （t∙d^-1）	反应器出口 φ（SO₂）/ %（干气）	反应器出口 φ（CO）/ %	反应器出口 φ（H₂）/ %	反应器出口 φ（CO₂）/ %	反应器出口 φ（H₂O）/ %	反应器出口 φ（O₂）/ %
未干燥含结晶水	50% O₂+50% CO₂	1 000	1 100	60.12	241.03	412.15	15.96	1.11	0.28	56.93	29.02	0.37
干燥脱水	50% O₂+50% CO₂	1 000	1 100	36.37	182.11	295.01	20.49	0.71	0.05	70.02	9.03	0.45
干燥脱水	空气	1 000	1 100	84.93	227.63		8.39	0.75	0.09	19.26	4.74	0.06
干燥脱水	50% O₂+50% H₂O	1 000	1 100	35.03	174.36	279.32	33.17	0.59	0.33	36.61	42.00	0.47

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Feasibility analysis of calcination and decomposition process of phosphogypsum in circulating fluidized bed

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