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ANALISIS DISTRIBUSI UKURAN PARTIKEL TERHADAP HOMOGENITAS TOTAL MOISTURE DAN ASH CONTENT BATUBARA BLENDING BA-48 PT BUKIT ASAM (PERSERO) TBK

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PT Bukit Asam (Persero) Tbk implements a market brand system to maintain coal quality consistency in accordance with customer specifications. One of its products is BA-48 blended coal, which is produced through a coal blending process involving the mixing of different coal types to achieve the desired quality targets. In the blending process, product quality homogeneity is a critical factor as it influences the stability of coal quality parameters such as total moisture and ash content. Therefore, controlling the physical characteristics of the material, particularly particle size distribution, is essential for maintaining the quality of the final product. Particle Size Distribution (PSD) affects material behavior during handling and blending processes. Variations in particle size may lead to material segregation, thereby reducing the homogeneity of the blend. In addition, particle size distribution influences the distribution of moisture and mineral matter within the coal, which are closely related to total moisture and ash content values. This study was conducted at the Westham stockpile of PT Bukit Asam (Persero) Tbk using BA-48 blended coal as the research object. Particle size distribution was analyzed using sieve analysis, while coal quality was evaluated through total moisture and ash content testing. The characteristics of particle size distribution were assessed using particle size fractions, the Coefficient of Uniformity (CU), and the Coefficient of Curvature (CC), whereas quality homogeneity was evaluated using the Coefficient of Variation (CoV). The results indicate that all BA-48 coal samples exhibit a well-graded particle size distribution, as demonstrated by Coefficient of Uniformity (CU) values greater than 4 and Coefficient of Curvature (CC) values ranging between 1 and 3 for all sampls. The particle size distribution was dominated by the gravel fraction, accounting for 52.78% to 73.49% of the material, while the combined sand and fine fractions ranged from 26.51% to 47.22%. The homogeneity of total moisture was relatively good, with CoV values ranging from 0.88% to 6.30%, whereas ash content exhibited greater variability, with CoV values ranging from 2.70% to 25.80%, indicating that ash content quality tends to be less stable. Furthermore, the analysis revealed a very strong relationship between particle size distribution and total moisture stability, while a relatively strong relationship was observed with ash content based on descriptive, quantitative, and Pearson correlation analyses. The findings of this study can serve as a basis for evaluating particle size control strategies in coal blending operations to improve the quality homogeneity of BA-48 blended coal.

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Detail Information

Series Title

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Call Number

T2010332026

Publisher

Indralaya : Prodi Teknik Pertambangan, Jurusan Pertambangan dan Geologi Fakultas Teknik Universitas Sriwijaya., 2026

Collation

xvi, 92 hlm.; ilus.; tab.; 29 cm.

Language

Indonesia

ISBN/ISSN

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Classification

622.330 7

Content Type

Text

Media Type

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Carrier Type

-

Edition

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Subject(s)

Penambangan batubara
Prodi Teknik Pertambangan

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MI

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