Effects of grinding aids on model parameters of a cement ball mill and an air classifier

Toprak, Nurettin Alper; Benzer, A.H.

doi:10.1016/j.powtec.2018.12.039

Cited by 22 publications

(9 citation statements)

References 20 publications

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“…In the best case, this may become apparent in the deviations in the PBM-fitted PSDs from the experimental PSDs; in the worst case, the PBM may still provide a reasonable fit with some deviations. To minimize such modeling errors, two actions can be taken: (i) add the aggregation and/or particle growth terms to the PBM [21] or (ii) use stabilizers/dispersants in wet milling [22] and flow aids in dry milling to suppress aggregation-particle growth [23].…”

Section: Principle I: Reduce Modeling Errorsmentioning

confidence: 99%

Population Balance Modeling of Milling Processes: Are We Falsifying Breakage Kinetics and Distribution via Back-Calculation Methods?

Bilgili

2024

Powders

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Population balance models (PBMs) for milling processes are based on two fundamental concepts: specific breakage rate function and breakage distribution function, which vary with particle size as well as design–operation conditions. The solution of the inverse problem, i.e., the estimation of these two functions’ parameters, may cause falsified kinetics and breakage distribution mechanisms. This perspective article aims to expose and mitigate various aspects of potential falsification, thus enabling the development of a robust PBM. Through an in-depth analysis of historical approaches to the PBM inverse problem and experimental observations, as well as the author’s recent contributions to the inverse methodology within the context of back-calculation methods, six principles have been offered: (i) include the governing physical phenomena and reduce errors in model building; (ii) reduce the number of model parameters via size–operation-dependent functional forms, hybrid approaches for back-calculation, and combination with CFD–DEM and other mechanistic models; (iii) generate a dense particle size distribution data set obtained at various milling times and/or locations; (iv) ensure a grid-independent solution with a sufficient number of size classes; (v) use a global optimization-based back-calculation method for parameter estimation and provide standard errors of the estimates; and (vi) test the predictive capability of the PBM. This perspective article boosts awareness of various challenges involved in the solution of the inverse PBM problem as pertinent to milling processes and provides researchers with six principles to minimize falsified kinetics.

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Section: Principle I: Reduce Modeling Errorsmentioning

confidence: 99%

Population Balance Modeling of Milling Processes: Are We Falsifying Breakage Kinetics and Distribution via Back-Calculation Methods?

Bilgili

2024

Powders

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“…Mixing of GAs with the material to be comminuted produces a finer product at the same production rate or a higher production rate at the same product fineness [27]. However, this advantage of the GAs should be considered subject to several factors that have been found to influence clinker grindability.…”

Section: Contributions Of Grinding Aidsmentioning

confidence: 99%

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Nthiga Njiru,

Wachira Muthengia,

Mulwa Munyao

et al. 2023

Advances in Civil Engineering

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Grinding aids (GAs) are polar chemicals introduced in cement mills in either liquid or powder form to improve on mill grindability efficiency. Studies have shown that some GAs not only help in grinding efficiency but also play vital roles in improving the product particle size distribution, product ability to flow in the mill, grinding energy reduction, and improvement on the separator efficiency. This review investigated the impacts of the GAs on the performance of some properties of cement when used as either mortar and/or concrete. The influence of the GAs incorporation in cement grinding on properties such as workability and setting times of the placed concrete and/or mortar has been covered in this review. The performance of GAs on ordinary portland cement (OPC) and blended cements with other supplementary cementitious materials such as pozzolana, fly ash, and slag has also been discussed. This is in view to tapping the maximum benefits of using GAs in cement production and use. This review work established that GAs have a positive influence on mill performance when properly applied. It further established that blended cements work better when dosed with additives such as GAs and/or quality improvers when compared to OPC. The review work demonstrated that some superplasticizers help in lowering the water demand in highly blended pozzolanic-based cements. The review finally recommended that the future course of action in the production of blended cements should apply GAs. This is in order to help produce highly replaced blended cements that are sustainable.

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“…Improved compressive strength of cement by the use of ultra-fine cement as a blend has been achieved before [6]. It is emphasized that by maintaining optimum content of nanomaterials in cement composites the durability and mechanical efficiency can be achieved [7][8][9]. Moreover, the reactive additives in construction materials are also found to be useful [10].…”

Section: Introductionmentioning

confidence: 98%

Analysis of Fine Sulfoaluminate Cement by Strength and Thermogravimetric Analysis

Ansari

2020

Adv. Mater. Lett.

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Effects of grinding aids on model parameters of a cement ball mill and an air classifier

Cited by 22 publications

References 20 publications

Population Balance Modeling of Milling Processes: Are We Falsifying Breakage Kinetics and Distribution via Back-Calculation Methods?

Population Balance Modeling of Milling Processes: Are We Falsifying Breakage Kinetics and Distribution via Back-Calculation Methods?

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Analysis of Fine Sulfoaluminate Cement by Strength and Thermogravimetric Analysis

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