Reuse of the soda sludge dealt with water washing as a supplementary material for the synthesis of clinker binders

Wang, Qiang; Li, Jingjing; Zhang, Jiakang; Wu, Peng; Lyu, Xianjun; Hu, Shugang; Qiu, Jun; Liu, Xiaodong; Yu, Hao

doi:10.1016/j.jclepro.2021.126433

Cited by 26 publications

(7 citation statements)

References 42 publications

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“…With the increase of the amount of soda residue, the degree of improvement and reduction is also greater. The reason is that soda residue is a material with high water absorption and high alkalinity (Wang et al, 2021a). The addition of soda residue can improve the hardening speed of cement at the initial hydration stage and the early strength of cement-solidi ed soil.…”

Section: Uncon Ned Compressive Strengthmentioning

confidence: 99%

“…Based on the macroscopic test results in this work, the curing and leaching mechanism of Cement-Soda residue composites for solidi ed/stabilized heavy metal lead-contaminated soil was visualized and speculated by referring to the relevant literature (Zha et al, 2020a;Wang et al 2021a) and depending on the basic chemical theoretical knowledge. Firstly, when the cement-soda residue solidi ed soil encounters water, it will undergo hydration reaction and forming a lot of gel (Fig.…”

Section: Solidi Cation Mechanismmentioning

confidence: 99%

“…After the human body inhaled the dry soda residue powder, it will corrode the respiratory mucosa and endanger human health. Moreover, the soda residue contains a great deal of chloride ions, which will in ltrate into the groundwater with rainwater and pollute the water environment (Wang et al, 2021a). Soda residue has become an important research topic, and many scholars have also conducted a lot of research and exploration on the effective reuse of soda residue (Zha et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Zuo

Wang

et al. 2022

Environ Earth Sci

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The cement solidi cation/stabilization method of heavy metal contaminated soils has been promoted in engineering practice and applied on a large scale for site remediation, but it still reveals some scienti c problems in the current complex and variable global extreme climate. To solve these problems and explore cement-based soil remediation technology, this study used the waste soda residue produced in large quantities in the "ammonia-soda process" as a composite additive, and established an innovative composite model of cement and soda residue by adding different ratios, which was applied to the remediation experiments of lead-contaminated soil. The innovative composite model solidi cation/stabilization of cement and soda residue for uncon ned compressive strength and toxic leaching properties under different soil environmental conditions were investigated. Moreover, curing and leaching mechanisms are discussed, and future industrial practice was evaluated. The results showed that the addition of soda residue improved the early (20 days) uncon ned compressive strength (UCS) of the composite curing agent for lead-contaminated soil by an average of 23.1% Mpa.When the percentage of soda residue composite was 40%, the UCS strength was 0.96 Mpa, which reached the maximum. The concentration of Pb 2+ in the leachate of the cement-soda residue composite curing agent was greatly reduced (average 3.28 times) compared with that of a single cement in the same situation, with an average leached Pb 2+ concentration of 1.87 mg•L -1 . This indicates that the addition of alkali residue improved the curing effect. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction between the cement-soda residue composite and soil particles. The leaching mechanism of cement-soda residue to aqueous solution is mainly the consumption of acid ions by alkaline substances. This study will provide scienti c data to support potential lead-containing soil in site remediation technologies and future large-scale engineering applications. Highlights 1. The cement and soda residue were compounded in a direct homogeneous mixture.2. The UCS, TCL, curing and leaching mechanisms were researched and discussed.3. The doping ratios of S b /S d =20% and S s /S b =40% have the best curing effect. 4. cement-soda residue composite reduces the leaching of Pb 2+ by 3.28 times, i.e. 1.87 mg•L -1 . 5. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction.

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Section: Uncon Ned Compressive Strengthmentioning

confidence: 99%

Section: Solidi Cation Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Zuo

Wang

et al. 2022

Environ Earth Sci

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“…Although the water washing method has been studied for decades, most of the previous studies usually washed PG for only one time to calculate washing efficiency. However, the actual washing process is influenced by multiple factors 18 , 24 . Moreover, PG is a slightly water-soluble substance containing a variety of impurities, and the process of water washing PG must be complicated.…”

Section: Introductionmentioning

confidence: 99%

Reuse of phosphogypsum pretreated with water washing as aggregate for cemented backfill

Zhou

Shi

et al. 2022

Sci Rep

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Phosphogypsum (PG) is reused as aggregate in the cemented backfill, which effectively improves the PG reutilization efficiency. However, the massive impurities contained in aggregate PG would adversely affect the hydration of binder, and therefore deteriorate the strength development of backfill. This research starts with the feasibility study on pretreating PG with the water washing method. Based on the most economical principle of the water demand, the optimal conditions for washing PG were determined at a stirring time of 5 min and a solid–liquid ratio of 1:0.5. Then, the original and pretreated PG were made into the backfill. Compared to using the original PG, the backfill slurry using the pretreated PG had better fluidity performance, such as the lower slurry viscosity and the higher bleeding rate. Furthermore, with the pretreated aggregate PG, the backfill strength was significantly enhanced by more than 8 times. Finally, the environmental behavior of the cemented backfill was investigated. Using the pretreated PG as aggregate, concentrations of PO43− and F− in the bleeding water and backfill leachates could meet the Chinese standard for integrated wastewater discharge. The results extend the reuse of PG as aggregate in a more environmental-friendly way, meeting the needs for sustainable mines.

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“…However, previous studies usually washed PG for only one time to calculate washing e ciency. In fact, multiple washes can achieve a continuous reduction of impurities in solid waste (Mao et al 2020, Wang et al 2021. Therefore, the removal e ciency of impurities in PG under different washing conditions should be investigated.…”

Section: Introductionmentioning

confidence: 99%

Reuse of Phosphogypsum Pretreated with Water Washing as Aggregate for Cemented Backfill

Zhou

Shi

et al. 2022

Preprint

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Phosphogypsum (PG) is reused as aggregate in the cemented backfill of the mines, which effectively improves the PG reutilization efficiency. However, the massive impurities contained in aggregate PG would adversely affect the hydration of binder, and therefore deteriorating strength development of backfill. This research starts with the feasibility study on pretreating the aggregate PG with the water washing method. Based on the most economical principle of the water demand, the optimal conditions for washing PG were determined at a stirring time of 5 min and a solid-liquid ratio of 1:0.5. Then, the original and the pretreated PG were made into the backfill. Compared to using the original PG, the backfill slurry using the pretreated PG had better fluidity performance, such as the lower slurry viscosity, the higher bleeding rate and the shorter setting times. Furthermore, with the pretreated aggregate PG, the strength of the backfill was significantly enhanced by more than 8 times, which was due to the removal of impurities on the surface of PG in the pretreatment. Finally, the environmental behavior of the cemented backfill was investigated. Using the pretreated PG as aggregate, concentrations of PO43−-P and F− in the bleeding water and leachates of backfill could meet the Chinese standard for integrated wastewater discharge, which significantly reduced the adverse effect of PG on the environment. The results extend the reuse of PG as aggregate in a more environmental-friendly way, meeting the needs for sustainable mines.

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Reuse of the soda sludge dealt with water washing as a supplementary material for the synthesis of clinker binders

Cited by 26 publications

References 42 publications

Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Reuse of phosphogypsum pretreated with water washing as aggregate for cemented backfill

Reuse of Phosphogypsum Pretreated with Water Washing as Aggregate for Cemented Backfill

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