Electronic Theses and Dissertation

Kebutuhan baja nasional yang terus meningkat mendorong pengembangan bahan baku alternatif berkualitas tinggi, salah satunya Hot Briquetted Iron (HBI). HBI merupakan produk hasil pemadatan Direct Reduced Iron (DRI) pada temperatur tinggi yang memiliki kandungan besi tinggi, kepadatan yang baik, serta stabilitas kimia yang lebih unggul dibandingkan DRI konvensional. Penelitian ini bertujuan untuk menganalisis pengaruh temperatur dan media quenching terhadap kualitas HBI yang dihasilkan. Bahan baku yang digunakan berupa bijih besi asal Lhoong, Aceh Besar dan aspal sebagai perekat. Variasi temperatur dan media quenching diterapkan untuk mengetahui pengaruhnya terhadap massa jenis, ketahanan mekanik melalui I-Type Tumbler Test, serta karakteristik pori menggunakan analisis Scanning Electron Microscope (SEM). Hasil penelitian menunjukkan bahwa temperatur proses dan jenis media quenching memengaruhi kualitas HBI, di mana media dengan laju pendinginan lebih tinggi cenderung meningkatkan massa jenis, memperbaiki ketahanan mekanik, serta mengurangi ukuran dan jumlah pori pada struktur HBI. Selain itu, terdapat hubungan antara massa jenis dan media quenching yang digunakan, yang menunjukkan bahwa peningkatan laju pendinginan menghasilkan struktur yang lebih padat dan homogen. Dengan demikian, penerapan metode quenching berpotensi meningkatkan kualitas HBI sehingga dapat mendukung penyediaan bahan baku yang lebih baik bagi industri baja nasional.
Kata kunci: Hot Briquetted Iron (HBI), quenching, temperatur, massa jenis, porositas, tumbler test, SEM.

The increasing demand for national steel has driven the development of high-quality alternative raw materials, one of which is Hot Briquetted Iron (HBI). HBI is a product of Direct Reduced Iron (DRI) solidification at high temperatures that has a high iron content, good density, and superior chemical stability compared to conventional DRI. This study aims to analyze the effect of temperature and quenching media on the quality of the resulting HBI. The raw materials used are iron ore from Lhoong, Aceh Besar and asphalt as an adhesive. Variations in temperature and quenching media were applied to determine their effect on density, mechanical resistance through the I-Type Tumbler Test, and pore characteristics using Scanning Electron Microscope (SEM) analysis. The results showed that the process temperature and type of quenching media affect the quality of HBI, where media with higher cooling rates tend to increase density, improve mechanical resistance, and reduce the size and number of pores in the HBI structure. In addition, there is a relationship between density and the quenching media used, which shows that increasing the cooling rate results in a denser and more homogeneous structure. Thus, the application of the quenching method has the potential to improve the quality of HBI, thereby supporting the supply of better raw materials for the national steel industry.