Experimental Study on Preparation of High-purity CaCO<sub>3</sub> from Phosphogypsum

LIU Lu; QIAO Jingyi; LIU Zhuoqi; XIAO Jiaqin; DING Wenjin; SUN Hongjuan

doi:10.13779/j.cnki.issn1001−0076.2022.05.015

2022 Vol. 42, No. 5

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Article navigation > Conservation and Utilization of Mineral Resources > 2022 > 42(5): 126-131

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LIU Lu, QIAO Jingyi, LIU Zhuoqi, XIAO Jiaqin, DING Wenjin, SUN Hongjuan. Experimental Study on Preparation of High-purity CaCO3 from Phosphogypsum[J]. Conservation and Utilization of Mineral Resources, 2022, 42(5): 126-131. doi: 10.13779/j.cnki.issn1001−0076.2022.05.015

Citation:

LIU Lu, QIAO Jingyi, LIU Zhuoqi, XIAO Jiaqin, DING Wenjin, SUN Hongjuan. Experimental Study on Preparation of High-purity CaCO₃ from Phosphogypsum[J]. Conservation and Utilization of Mineral Resources, 2022, 42(5): 126-131. doi: 10.13779/j.cnki.issn1001−0076.2022.05.015

Experimental Study on Preparation of High-purity CaCO₃ from Phosphogypsum

Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China

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Corresponding author: DING Wenjin

Received Date: 11 April 2022

Accepted Date: 11 April 2022

Publish Date: 25 October 2022

Abstract

Abstract

Based on the resource utilization of phosphogypsum, a kind of spherical calcium carbonate was prepared by chemical leaching-carbonization method. The single factor experiment of leaching and carbonization of phosphogypsum was carried out. The experimental results showed that the optimal extraction conditions of phosphogypsum were as follows: sodium acetate concentration of 4 mol/L, liquid-to-solid ratio of 25∶1 mL/g, salt leaching temperature of 50 ℃, salt leaching time of 30 min. The optimal carbonization conditions were as follows: ammonia concentration 15 mL, CO₂ flow rate 80 mL/min, carbonization temperature 30 ℃, carbonization time 60 min. The crystal phase of the product was vaterite, and the morphology of the product was spherical. After 8 cycles of sodium acetate auxiliaries, the reaction efficiency of calcium carbonate production was 57.8% after two cycles of sodium acetate auxiliaries. This study provides a new method for phosphogypsum comprehensive utilization and calcium carbonate production.
- phosphogypsum /
- sodium acetate /
- high-purity CaCO₃ /
- recycling utilization

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References

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