Controlling the soundness of Portland cement clinker synthesized with solid wastes based on phase transition of MgNiO2

Tang, Yanjie; Zhao, Liang; Li, Bo; Chen, Wei

doi:10.1016/j.cemconres.2022.106832

Cited by 18 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…( b ) Relation between the iron content in the melt phase amount at 1450 °C by thermodynamic modelling. Validation of risk zones based on self-pulverising and Portland clinkers from the literature 23 , 31 , 70 – 75 . …”

Section: Resultsmentioning

confidence: 99%

“…The results, parameters, and trends observed in the dosing method were validated based on 21 clinker samples synthesised in eight previous studies 23,31,[70][71][72][73][74][75] . The validation consisted of simulating the clinkers produced by these authors and comparing the results with the trends observed in this study.…”

Section: Framework Validationmentioning

confidence: 99%

“…Such variability stems from using alternative feedstocks such as waste or by-products, containing impurities, which can induce temperature changes inside the kiln and during the cooling process 8 . Different minor impurities can stabilise or destabilise specific silicate phases over others, induce the formation of new clinker phases, and compromise the reactivity and stability of the cement when hydrated [28][29][30][31] . Predictive modelling tools can mitigate all these factors.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Costa,

Coppe,

Bielefeldt

et al. 2023

Sci Rep

View full text Add to dashboard Cite

The valorisation of waste or by-products in Portland clinker production is a promising alternative for developing sustainable cements. The complexity of the chemical reactions during clinkering demands an adequate dosing method that considers the effect of feedstock impurities to maximise the potential substitution of natural resources by waste or by-products, while guaranteeing the clinker reactivity requirements. This study proposes a raw meal proportioning methodology for optimising co-processing of natural feedstocks with alternative raw materials in clinker production, intending to reduce the content of natural raw materials needed, while promoting an optimal clinker reactivity. A thermodynamic modelling sequence was developed considering the variability of raw materials composition and heating temperatures. The model was then validated by comparing simulation outcomes with results reported in previous studies. An experimental case study was conducted for validation of the proposed method using a spent fluid catalytic cracking catalyst (SFCC), a by-product from the oil industry as an alternative alumina source during clinkering. The modelling simulations indicated that substitution of natural feedstocks by 15 wt% SFCC promotes the formation of reactive clinkers with more than 54% tricalcium silicate (C3S). Mixes with the potential to form the highest C3S were then produced, and heating microscopy fusibility testing was applied for evaluating the clinkers’ stability. The main factors governing the reactivity and stability of the clinker phases were the melt phase content, alumina modulus, and formation of C3S and dicalcium silicate (C2S). The self-pulverisation of clinker during cooling was observed in selected mixes, and it is potentially associated with high viscosity and low Fe content in the melt phase. The proposed framework enables optimisation of the dosing of raw meals containing alternative alumina-rich feedstocks for clinker production and allows a deeper interpretation of limited sets of empirical data.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Framework Validationmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Costa,

Coppe,

Bielefeldt

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…From Table 2, it can be seen that all results for the soundness test fell below the EN-196-3-specified maximum limit of 5.0 mm. This is due to the low MgO and SO 3 content in the blended cements [33,34]. The blended cements showed improved soundness as compared to the control.…”

Section: Water Demand Setting Time and Soundnessmentioning

confidence: 97%

Hydration, Reactivity and Durability Performance of Low-Grade Calcined Clay-Silica Fume Hybrid Mortar

Boakye,

Khorami

2023

Applied Sciences

View full text Add to dashboard Cite

Low-grade calcined clay, due to its low cost, availability and low temperature calcination, has been gaining attention in recent times as a supplementary cementitious material (SCM) in the manufacture of revolutionary building materials to improve the fresh and hardened properties of concrete. Silica fume, on the other hand, has been used, over the years, to improve the performance of concrete due to its reduced porosity and improved transition zone quality. In spite of the individual contribution of these two pozzolans to the strength and durability of concrete, there is a knowledge gap in the properties of ternary blended mixes utilizing calcined clay and silica fume. In this study, the synergistic effect of calcined clay and silica fume on the fresh and hardened properties of cementitious mortar have been investigated. The two pozzolans were used to partially substitute Portland cement to form a ternary blended composite binder having, at a maximum, a replacement of 30% by weight and a varying content of calcined clay and silica fume. The influence of the binary and ternary blended mixes on hydration, pozzolanic reactivity and the mechanical and durability properties of mortar was studied. From the results, partial replacement of cement with 30% calcined clay and silica fume caused significant reductions in the portlandite content of the two hydrated pastes at all curing ages. Drying shrinkage was found to be less severe in the control mortar than the blended cement mixes. Compared to the blended cement specimens, the control suffered the most weight (13.3%) and strength (10%) losses, as indicated by the sulphate resistance test.

show abstract

“…The best thermodynamic efficiency was then determined using data from the plant's running processes, including clinker mass flow, clinker cooling airflow, clinker temperature, and ambient temperature. By regulating the soundness of clinker induced through the magnesia (MgO) control have suggested by Tang et al 25 The addition of nickel oxide (NiO) to the raw feed of clinker controls its soundness by creating magnesium dioxide (MgNiO2) with free magnesium oxide (MgO). However, the suggested process has minimal impact on hydration and strength improvement of cement made from solid‐wastes.…”

Section: Introductionmentioning

confidence: 99%

Optimum control of under‐grate pressure of clinker cooler by optimizing the proportional integral derivative controller parameters using honey badger algorithm technique

Brijet¹,

Suresh²

2023

Optim Control Appl Methods

View full text Add to dashboard Cite

The minimum air pressure necessary at the grate to penetrate a bed of heated clinker of a certain thickness and permeability is known as under‐grate pressure. It is vital to keep the under‐grate pressure consistent because excessive pressure causes the clinker to form an unstable suspension and minimum pressure allows heat from the clinker to harm the cooler grates. So it is necessary to obtain excellent performance through reasonable control methods. For this purpose, this article proposes an optimization approach for a proportional integral derivative (PID) controller to control the pressure below the grate of the clinker cooler. The proposed optimization approach is the honey badger algorithm (HBA), which mimics the feeding habits of honey badgers. The main aim of proposed approach is to maintain and regulate under‐grate pressure of clinker cooler using HBA and provide optimum cooling rate to clinker. The proposed approach based grate cooler also provide the less electricity consumption and stable temperature. The proposed technique is implemented in MATLAB and its efficiency is compared to various existing techniques. From the simulation, the electricity consumption of proposed approach RMSE is 158 and mean accuracy is 98.65. Under‐grate pressure based RMSE is 5.01 and the mean accuracy become 99.55. The outlet temperature based RMSE of proposed approach is 4.32 and mean accuracy is 81.21. These values are lower than existing approaches, it reveals the proposed approach is better than the existing one.

show abstract

Controlling the soundness of Portland cement clinker synthesized with solid wastes based on phase transition of MgNiO2

Cited by 18 publications

References 40 publications

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Hydration, Reactivity and Durability Performance of Low-Grade Calcined Clay-Silica Fume Hybrid Mortar

Optimum control of under‐grate pressure of clinker cooler by optimizing the proportional integral derivative controller parameters using honey badger algorithm technique

Contact Info

Product

Resources

About