Preparation and study of magnesium ammonium phosphate cement from waste lithium slag

Dong, Peng; Ahmad, Muhammad Riaz; Chen, Bing; Munir, Muhammad Junaid

doi:10.1016/j.jclepro.2021.128371

Cited by 46 publications

(8 citation statements)

References 53 publications

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“…However, the considerable amount of concrete produced meets building industry requirements and has a detrimental influence on environmental circumstances [5][6][7][8]. The manufacturing of concrete and aggregates results in the generation of carbon dioxide (CO 2 ), dust, and other hazardous gases, which cause environmental damage [9][10][11][12][13][14]. Recently, the application of RA in concrete has acquired prominence in research, since it produces environmentally friendly concrete that also performs well in terms of mechanical properties [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Split Tensile Strength Prediction of Recycled Aggregate-Based Sustainable Concrete Using Artificial Intelligence Methods

et al. 2022

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Sustainable concrete is gaining in popularity as a result of research into waste materials, such as recycled aggregate (RA). This strategy not only protects the environment, but also meets the demand for concrete materials. Using advanced artificial intelligence (AI) approaches, this study anticipates the split tensile strength (STS) of concrete samples incorporating RA. Three machine-learning techniques, artificial neural network (ANN), decision tree (DT), and random forest (RF), were examined for the specified database. The results suggest that the RF model shows high precision compared with the DT and ANN models at predicting the STS of RA-based concrete. The high value of the coefficient of determination and the low error values of the mean absolute error (MAE), mean square error (MSE), and root mean square error (RMSE) provided significant evidence for the accuracy and precision of the RF model. Furthermore, statistical tests and the k-fold cross-validation technique were used to validate the models. The importance of the input parameters and their contribution levels was also investigated using sensitivity analysis and SHAP analysis.

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Section: Introductionmentioning

confidence: 99%

Split Tensile Strength Prediction of Recycled Aggregate-Based Sustainable Concrete Using Artificial Intelligence Methods

et al. 2022

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“…Due to the outstanding electrochemical properties, lithium has been applied widely in glass, pharmaceuticals, ceramic as well as lubrication industries, and demand quantity for lithium salts was continuously expanding recently [1,2]. During production process of lithium salts, enormous lithium slag (LS) produced from spodumene and lithium mica was emerged as industrial waste material [3][4][5][6][7][8][9], and more than 1 million tons of LS was released worldwide annually [4,7,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, LS has been widely investigated to explore the possibility of adopting in cement and concrete to achieve the recycling of resources and benefits [5,10,11,13,16,[19][20][21][22][23][24]. LS contained higher than 80 wt% of SiO2 and Al2O3, more than 6 wt% of SO3 and a spot of CaO and Fe2O3 [2,18,21,25]. Crystalline minerals in LS included quartz (SiO2), leached spodumene (LiAlSi2O6) and gypsum (CaSO4•2H2O) [12,14].…”

Section: Introductionmentioning

confidence: 99%

“…Noticeably, LS contained abundant zeolites, and possessed glassy pore structure with high internal surface area [2,9,30]. Therefore, the application of LS would have a remarkable negative impact on workability, and lead to a slow early strength development as well as prolonged setting time, due to a decreased hydration rate and retarded pozzolanic reaction [5,24,31].…”

Section: Introductionmentioning

confidence: 99%

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Effects of C-S-Hs-PCE and Na2SO4 on hydration behavior of cement-lithium slag binder

Chen

Liu

et al. 2023

Preprint

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Application of C-S-Hs-PCE and sodium sulfate into Portland cement containing 20 wt% lithium slag (LS) powder was investigated, in order to strengthen early mechanical properties. Synergistic effects of C-S-Hs-PCE and sodium sulfate on hydration properties and microstructure of cement-LS system were analyzed. Results showed that C-S-Hs-PCE was advantageous for modifying fluidity of fresh LS-cement binder, while increased dosage of sodium sulfate decreased dispersibility of fresh paste. C-S-Hs-PCE and sodium sulfate exhibited a synergistic effect on strength enhancement, hydration acceleration as well as setting behavior of LS-cement binder. Sodium sulfate increased alkalinity of interstitial solution and promoted dissolution of LS. Dissolved Al and Si from LS powder reacted with dissolved sulfate ions from sodium sulfate to produce extra hydrates, and C-S-Hs-PCE accelerated pozzolanic reaction as well as hydration reaction via nucleation effect collaborated with dispersing effect. C-S-Hs-PCE accelerated reaction process of sodium sulfate via nucleation effect, and activation effect of sodium sulfate provided more newly-formed hydrates to act as nucleation seeds or crystal skeleton for induce hydration of new phases. The accelerated hydration generated more AFt and C-S-H gel in the matrix. Newly formed hydrates promoted exceedingly the appearance of network, leading to a refinement of pore structure as well as enhancement in mechanical strength. Application of LS into cement as a greener binder could be obtained by synergistic adoption of C-S-Hs-PCE and sodium sulfate.

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“…1 For China's lithium carbonate production of 215 900 tons in 2021, there were over 2 million tons of lithium slag. Only a small amount of lithium slag (∼5%) was used as a cement or concrete admixture, 2,3 as a mine filling cementing agent, 4 or for the preparation of clinker, 5 ceramics, 6 geological polymers, 7 etc. , and a large amount of lithium slag was landfilled or stacked for disposal, with a low resource utilization rate.…”

Section: Introductionmentioning

confidence: 99%

Insight into the kinetic behavior of microwave-assisted synthesis of NaX zeolite from lithium slag

Huang¹,

Wang²,

Lin³

et al. 2023

New J. Chem.

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Preparation and study of magnesium ammonium phosphate cement from waste lithium slag

Cited by 46 publications

References 53 publications

Split Tensile Strength Prediction of Recycled Aggregate-Based Sustainable Concrete Using Artificial Intelligence Methods

Split Tensile Strength Prediction of Recycled Aggregate-Based Sustainable Concrete Using Artificial Intelligence Methods

Effects of C-S-Hs-PCE and Na2SO4 on hydration behavior of cement-lithium slag binder

Insight into the kinetic behavior of microwave-assisted synthesis of NaX zeolite from lithium slag

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