A New Chemical Method to Predict Grindability Index (HGI) for Limestones

Year 2022, Volume: 9 Issue: 1, 124 - 137, 30.06.2022

Candan Bilen

https://doi.org/10.35193/bseufbd.997319

Cited By: 1

Abstract

In this study, limestone samples (a total of 58 sample) were investigated in terms of their grindability and chemical composition. Grindability tests were carried out on standard HGI mill. Limestone samples were collected from two different limestone quarry and they were characterized in terms of their chemical composition. In the order of technological utilization, grindability nature of limestones is as significant as their chemical composition. Chemical composition of the limestone samples from the quarries under investigation differs and so does the grinding index, i.e. HGI (Hardgrove Grinding Index). In the context of this study, chemical composition data of limestone samples were correlated with the results of the grinding tests (HGI values). In addition, abovementioned correlations were provided as graphical demonstrations in this context. After these abovementioned graphical demonstration of the relationships between HGI values and chemical composition data, the role of the each chemical composition item in terms of grindability was understood. Based on this understanding, an empirical formula employing the chemical composition data was proposed to predict HGI.

Keywords

Limestone Quarry, Chemical Composition, HGI, Modeling, Limestone Grinding

Thanks

Authors of this study would like to thank to Limestone Quarry Companies’ owners and the operators for providing the samples.

Kireçtaşları İçin Yeni Bir Kimyasal Öğütme İndeksi

Abstract

Bu çalışmada, kireçtaşı numuneleri (toplam 58 numune) öğütülebilirlik ve kimyasal bileşim açısından incelenmiştir. Öğütülebilirlik testleri standart HGI değirmeninde gerçekleştirilmiştir. Kireçtaşı örnekleri iki farklı kireçtaşı ocağından alınmış ve kimyasal bileşimleri açısından karakterize edilmiştir. Teknolojik kullanım sırasına göre, kireçtaşının kimyasal bileşimi kadar öğütülebilirliği de önemlidir. İncelenen ocaklardan alınan kireçtaşı numunelerinin kimyasal bileşimleri ve öğütme indeks (Hardgro ve Öğütülebilirlik Indeksi) değerleri farklıdır. Bu çalışma kapsamında, kireçtaşı numunelerinin kimyasal bileşim verileri ile öğütülebilirlik test sonuçları (HGI değerleri) ile ilişkilendirilmiştir. Bunun yanında, belirtilen bu ilişkilendirmeler grafiksel gösterim olarak bu kapsamda verilmiştir. HGI değerleri ile kimyasal bileşim verileri arasındaki ilişkilerin grafiksel gösteriminden sonra, her bir kimyasal bileşim öğesinin öğütülebilirlik açısından rolü anlaşılmıştır. Bu çalışma kapsamında HGI'yi tahmin etmek için kimyasal bileşim verilerini kullanan ampirik bir formül önerilmiştir.

Keywords

Kireçtaşı Ocağı, Kimyasal Bileşim, HGI, Modelleme, Kireçtaşı Öğütme

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