Technoeconomic Analysis of a Brine Purification Process─Combined Carbon Dioxide Mineralization and Hydromagnesite Recovery
Abstract
A huge amount of brine purification sludge (BS) is discharged from soda plants every year, which results in serious environmental pollution and resource waste. In this work, a modified brine purification route is proposed. First, the brine is purified by adding lime, sodium sulfate, and soda ash sequentially to remove magnesium and calcium ions; meanwhile, the BS is produced. Then, CO 2 is mineralized by the sludge through the carbonation reaction. Finally, magnesium sulfate, the product of the carbonation reaction, is used to produce hydromagnesite. The optimal reaction conditions were investigated, under which the magnesium ion leaching efficiency can reach up to 95.54% in the carbonation reaction step and the magnesium ion utilization efficiency can reach up to 99.05% in the hydromagnesite production step. The characterization results indicated that high-purity calcite and hydromagnesite were obtained. Based on the optimal operational condition, the economic analysis for the process was completed and the results showed that the modified route was economically feasible.
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A recent work demonstrated a feasible route for purifying brine sludges via chemical treatment with calcium carbonate (lime), sodium sulphate, and sodium carbonate (soda ash).
“However, a recent work have demonstrated a feasible route for purifying brine sludges via chemical treatment with calcium carbonate (lime), sodium sulphate, and sodium carbonate (soda ash).106”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [106]
Methods for CO2 mineralization can be broadly separated into three main approaches: pH-swing, elevated temperatures and CO2 pressures, and reaction of Mg bearing silicates with CO and H2O via water-gas shift reaction to produce magnesium carbonates and H2(g).
“These contradictions have motivated the development of different methods for CO 2 mineralization which can be broadly separated in three main approaches: the first based on pH-swing, the second based on the usage of elevated temperatures and CO 2 pressures, 105,115 and the third reacts Mg bearing silicates with CO and H 2 O via water-gas shift reaction to produce magnesium carbonates and H 2 (g).”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [105]
The main issue in establishing local production of Mg raw materials is related to the feasibility and economic viability of the extraction route.
“Thus, the main issue in establishing local production of Mg raw materials is related to the feasibility and economic viability of the extraction route.105”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [105]
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- Authors
- Cao, X., Zhang, S., Zhao, H., Zhong, Y., Zhang, R., & Liu, R.
- Affiliations
- Hebei University of Science and Technology (CN)
- Corresponding author
- Liu, Runjing
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-05-09
- Volume
- 61
- Issue
- 20
- Pages
- 6802-6812
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W4229442704
- Cited by
- 7
- References
- 30
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 1 · 2023: 2
- FWCI
- 0.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Funders
- Natural Science Foundation of Hebei Province (B2021208026)
- State Key Laboratory of Chemical Engineering (SKL-ChE-21B02)
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Engineering › Mechanical Engineering › Extraction and Separation Processes
- Physical Sciences › Engineering › Building and Construction › Recycling and utilization of industrial and municipal waste in materials production
- Keywords
- brine purification, CO2 mineralization, hydromagnesite, magnesium sulfate, carbonation, calcite, process optimization, techno-economic analysis, magnesium recovery
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