Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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ANALYSIS OF METALS MINING SECTOR LINKAGE ON NATIONAL ECONOMIC
No full textMetals mining is one of the sectors that drives the national economy, and produced to meet the needs of human life. Almost all industries need this sector as an input either directly or indirectly, and each creation of the output from this sector requires input from many other industries. The role of this sector can be traced by calculating its spreading (downstream linkages) and its degree of sensitivity (upstream linkages) of any other sectors in the country. The data used for supporting this calculation comes from trade transactions between sectors that have been compiled into Indonesian input-output tables. The analysis objective is to find the impact of metals mining sector on the regional economy. The method is conducted through approach of input-output analysis. Based on the calculation using inputoutput table analysis, it appears that there are four sectors that almost all its domestic output able to fulfill the needs of other sectors in the country, i.e. tin processing, other metals processing, gold processing, and silver processing sector. In other words, these four sectors have a high downstream linkage to other sectors in the country. The upstream linkages of these four sectors are also quite large because almost all other sectors in the country utilize the products of these sectors, either directly or indirectly. While the output of copper processing sector almost entirely for exports, it indicates that the other industries in the country have not been able to capitalize on this sector products due to various constraints such as technologies and investment in the processing and purification. This means that the copper mining sector has a low downstream linkage to the other sectors in the country. While the upstream linkage of this sector is very small, because this sector is not much utilizing the products from other sectors in the country for the production process. The four sectors are more impactful since they have a high level of upstream and downstream linkages to the other industry sectors in the country compared to the copper mining sector.
EKSTRAKSI KALSIUM DARI BIJIH DOLOMIT TERKALSINASI MENGGUNAKAN PELARUTAN ASAM KLORIDA
No full textPenggunaan kalsium sangat luas dalam berbagai aplikasi sektor industri. Dolomit merupakan salah satu sumber penghasil kalsium selain batu kapur dan air laut. Ekstraksi kalsium dari mineral dolomit dapat dilakukan melalui proses pelarutan. Pada penelitian ini, dilakukan proses pelarutan dolomit menggunakan larutan asam klorida untuk mengekstrak kalsium. Pelarutan dilakukan dengan memvariasikan kecepatan pengadukan, konsentrasi asam, suhu proses dan rasio padatan terhadap larutan untuk setiap waktu proses 0,5; 1; 2; 3; 4 dan 5 jam. Setelah proses pelarutan pada waktu tertentu sejumlah larutan diambil dengan menggunakan pipet sebanyak 5 mL kemudian disaring dan dianalisis menggunakan ICP-OES. Hasil percobaan menunjukkan bahwa efisiensi kalsium (CaCl2) terekstrak meningkat dengan penambahan konsentrasi asam, rasio cairan/padatan dan peningkatan suhu. Hasil optimum dicapai pada suhu 75 °C, konsentrasi larutan 2 M HCl dan kecepatan pengadukan 400 rpm dengan efisiensi kalsium terekstrak sebesar 97,57 %
PENGARUH TEMPERATUR DAN UKURAN BUTIR TERHADAP KELARUTAN KALIUM PADA BATUAN LEUSITIK GUNUNG MURIA JAWA TENGAH
No full textMineral yang berpotensi di bidang pertanian sebagai sumber unsur hara (pupuk) yang dibutuhkan tanaman adalah dolomit, batuan fosfat, dan mineral silikat seperti leusit, muskovit dan ortoklas. Leusit mengandung kalium dan aluminium tektosilikat K(AlSi2O6). Mineral ini dijumpai di Kabupaten Jepara, Pati dan Kudus. Di Medani, Jepara potensinya sebanyak 190.400.000 ton, kandungan K2O antara 1,92-8,77 %. Mineral leusit untuk penelitian ini mempunyai kadar K20 antara 7,68-7,98 %; Al2O3 19,62-20,73 % dan SiO2 48,62-49,93 %. Hasil analisis petrografi menunjukkan adanya fenokris yang terdiri dari leusit, sanidin dan mineral opak. Unsur kalium di dalam leusit sulit larut, sehingga perlu diupayakan peningkatan kelarutannya dengan cara memanaskan batuan mengandung leusit tersebut pada suhu 600-1000 °C dan penghalusan ukuran butiran dari -70 sampai -200 mesh. Sebagai pembanding digunakan percontoh tanpa pemanasan. Dari hasil uji coba, kelarutan tanpa pemanasan relatif rendah antara 0,22-0,49 %; semakin halus butiran kelarutan leusit cenderung semakin meningkat, tetapi pada suhu 600 °C terjadi peningkatan cukup signifikan antara 1,55-2,30 %, pada suhu 700 °C kelarutan relatif tetap yaitu antara 1,44-2,40 %, sedangkan pada suhu 850 °C mulai terjadi penurunan kelarutan menjadi 1,20-1,95 % dan pada suhu lebih tinggi 1000 °C, kelarutan menurun menjadi 0,31-0,45 %. Percobaan peningkatan kelarutan kalium cukup signifikan sampai 10 kali, diharapkan kegunaan untuk pupuk lebih baik
PRELIMINARY GEOMECHANICAL ANALYSIS ON LIMESTONES IN PPSDM GEOMINERBA CAMPUS, PADALARANG, WEST JAVA
No full textThe research location is in the PPSDM Geominerba field campus. The campus is located in Padalarang, West Java that is surrounded by the open-pit mining of limestone and marble. This limestone was formed in Oligo-Miocene of Rajamandala Formation. The research objective was to determine the condition of the slopes around the campus based on geomechanical characteristics. Based on field observations, the slope angle in the area is dominated by steep slopes. The rock hardness level is dominated by hard rock with a hardness ranging from 50-100 MPa. Rock Mass Rating shows that the area is dominated by good rocks. While the Slope Mass Rating calculation show that the maximum slope angle is between 52-75°. Level of deformation and intensive weathering process will reduce the strength of the rock in the future. Several rock fall occurrences on this research area support this assumption. Yet, some local open pit mining area activity near the toe hill of the area need to be concerned regarding the effect of the local rock fall occurrences
