磷石膏焙烧法制备β-半水石膏

doi:10.19964/j.issn.1006-4990.2023-0034

Abstract

Abstract:

In view of the difficulties in controlling temperature，time and other key thermal limits in the process of roasting phosphogypsum to prepare β-hemihydrous gypsum and high energy consumption，static roasting and multistage dynamic roasting were compared to explore the best thermal constants and technical indexes of phosphogypsum and phosphogypsum roasting after purification by flotation to prepare β-hemihydrous gypsum.The results showed that the content and mechanical properties of β-hemihydrate gypsum products prepared by multistage dynamic roasting purified phosphogypsum were better than original phosphogypsum.After the purified phosphogypsum was roasted at 180 ℃ for 60 min，β-hemihydrate gypsum content of 87.45% was gained.The initial and final setting time remained 3 min and 9 min，respectively，and the 2 h flexural and compressive strength reached 3.5 MPa and 7.8 MPa，respectively，which met the requirements of national standard Grade 3 products and could be used in the construction gypsum industry.

Key words: phosphogypsum, flotation, roasting, β-hemihydrate gypsum

CLC Number:

TQ132.32

GUO Ze, ZHANG Pengfei, YANG Fan, ZHANG Hanquan, LU Manman. Preparation of β-hemihydrate gypsum by phosphogypsum roasting[J]. Inorganic Chemicals Industry, 2023, 55(10): 106-113.

Figures/Tables 17

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References 20

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w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（Na₂O）	w（MgO）	w（SrO）	w（BaO）	w（TiO₂）	w（CuO）
51.68	40.43	3.92	1.39	0.552	0.183	0.093 6	0.081 5	0.079 9	0.003 9
w（S _x ）	w（Ca）	w（Si）	w（P _x ）	w（Na）	w（Mg）	w（Sr）	w（Ba）	w（Ti）	w（Cu）
20.69	28.91	1.83	0.608	0.410	0.110	0.079 1	0.073 0	0.047 9	0.003 1

w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（Na₂O）	w（MgO）	w（SrO）	w（BaO）	w（ZrO₂）	w（CuO）
53.07	44.22	0.65	0.85	0.44	0.098 8	0.10	0.12	0.005 8	0.003 2
w（S _x ）	w（Ca）	w（Si）	w（P _x ）	w（Na）	w（Mg）	w（Sr）	w（Ba）	w（Zr）	w（Cu）
21.25	31.62	0.30	0.37	0.33	0.059 6	0.09	0.11	0.004 3	0.002 6

样品	D10	D25	D50	D75	D90	D［3，2］	D［4，3］
β-半水石膏^a	3.44	6.61	15.58	34.67	57.85	8.66	26.84
β-半水石膏^b	2.61	4.37	9.52	19.95	34.40	6.17	14.94

样品条件	w（附着水）	w（CaSO₄·2H₂O）	w（水溶性P₂O₅）	w（水溶性Na₂O）	w（水溶性MgO）	w（F^-）	w（Cl^-）
磷石膏原样未焙烧	1.15	88.35	0.87	0.26	0.09	0.79	0.01
原样180 ℃焙烧1 h	0.10	90.53	0.81	0.23	0.09	0.77	0.001
纯化磷石膏未焙烧	0.33	98.21	0.035	0.10	0.01	0.07	0.01
纯化磷石膏180 ℃ 焙烧1 h	0.02	98.49	0.033	0.01	0.01	0.07	0.001
国标一级限值	≤15	≥90	≤0.20	≤0.05	≤0.10	≤0.10	≤0.05

样品	稠度/%	初凝时间/min	终凝时间/min	抗折强度/MPa	抗压强度/MPa
磷石膏原样	55	4	11	2.1	3.8
纯化磷石膏	55	3	9	3.5	7.8
国标4级品	—	≥3	≤30	≥4.0	≥8.0
国标3级品	—	≥3	≤30	≥3.0	≥6.0
国标2级品	—	≥3	≤30	≥2.0	≥4.0

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of β-hemihydrate gypsum by phosphogypsum roasting

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