Pengaruh Suhu dan Waktu Pemanasan terhadap Nilai HGI pada Sampel Batubara di PT. Bukit Asam Tbk

Abstract


 
 
 
 HGI is a laboratory measurement of the ease or difficulty of grinding or pulverizing coal. The grinding index value determines the time and effort required to grind coal to a certain fineness. This test is determined by preparing a certain grain size to be ground using a machine under standard conditions and the amount of coal being crushed is compared to the standard linearity of coal. The HGI standard values ​​that have been certified using ASTM standards are 32, 49, 65, and 95. This study consisted of variables, namely temperature and heating time, and related variables, namely HGI values. HGI data retrieval after heating minutes was carried out on coal samples with heating temperatures of 50˚C, 100˚C, 150˚C and 200˚C and heating times of 30 minutes, 60, 90 minutes and 120 minutes. The condition of the optimum HGI value was obtained at a heating temperature of 100℃ and a time of 60 minutes with an HGI value of 70.2558,. This index is very helpful in assessing the capacity of the mill used to grind coal to the required size for feed to the furnace besides HGI also affects how the coal is distributed in the lifting equipment properly.
 
 
 

Pengaruh dan Korelasi Analisis Proksimat (MAD, VM, Ash dan FC) Terhadap Nilai Hardgrove Grindability Index (HGI) Batubara di PT. Bukit Asam, Tbk. Effect and Correlation of Proximate Analysis (MAD, VM, Ash and FC) on the Hardgrove Grindability Index (HGI)

“…HGI merupakan suatu tolak ukur secara laboratorium dari mudah atau sulitnya batubara digerus atau di pulverizing. Nilai indeks ketergilingan memerlukan waktu dan tenaga yang diperlukan untuk menggiling batubara sampai pada kehalusan tertentu (Ghony, 2022). Berdasarkan hal tersebut, maka dianggap perlu dilakukan analisis pengaruh dan korelasi analisis proksimat (MAD, VM, Ash dan FC) terhadap nilai hardgrove grindability index (HGI).…”

“…Selanjutnya 50 gr sampel batubara yang lolos saringan 200 mesh dikering udarakan (antara 16-30 mesh) ditempatkan di mesin hardgrove (pabrik miniatur) dengan delapan bola baja 1 inci. Jenis bobot teratas ditempatkan pada bola dan muatan batubara dan diputar sebanyak 60 putaran (Ghony, 2022). Berikut Ini merupakan alat thermogravimetric analysis dan HGI machine yang dapat dilihat pada gambar 1 dan 2.…”