Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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PENGOLAHAN KROMIUM(VI) PADA AIR LIMBAH PERTAMBANGAN BIJIH NIKEL MENGGUNAKAN BESI(II) YANG DIPEROLEH DARI SLAG NIKEL
No full textAktivitas penambangan dan pengolahan bijih nikel yang memiliki kandungan kromium tinggi mengakibatkan lepasan Cr(VI) pada air limbah pertambangan. Cr(VI) pada air limbah menjadi perhatian utama pengelolaan lingkungan pertambangan bijih nikel. Cr(VI) memiliki toksisitas dan mobilitas tinggi, serta bersifat karsinogenik dan mutagenik. Di sisi lain, proses pirometalurgi bijih nikel menghasilkan slag yang memiliki kandungan Fe tinggi dan berpotensi menjadi sumber Fe(II) untuk mengolah Cr(VI). Pengolahan Cr(VI) dengan Fe(II) dari slag nikel dilakukan pada kondisi batch dan kontinu untuk menentukan parameter kunci yaitu rasio berat Fe(II):Cr(VI). Kondisi batch pada konsentrasi Fe(II) di larutan fero sulfat tetap dan bervariasi dengan menerapkan rasio berat Fe(II):Cr(VI) 1:1; 2,5:1; 5:1; 7,5:1; 10:1 dan 12,5:1 diperoleh penurunan Cr(VI) pada rentang 98,18 - 99,09%. Kondisi kontinu pada rasio berat Fe(II):Cr(VI)=7,5:1 diperoleh penurunan Cr(VI) pada rentang 98,46 - 100%. Hasil analisis konsentrasi logam terlarut Fe, Co, Ni, Cu, Zn, Cd, Pb, Cr pada air limbah hasil pengolahan telah memenuhi baku mutu air limbah pertambangan bijih nikel di Indonesia, dan konsentrasi logam terlarut As < 0,001 mg/L. Hasil ini menunjukkan bahwa Fe(II) dari slag nikel dapat menurunkan Cr(VI) pada air limbah pertambangan bijih nikel dengan signifikan
ANALISIS PASAR EXPANDED PERLITE INDONESIA
No full textKetersediaan perlit selalu berasosiasi dengan kegiatan vulkanisme sehingga potensi perlit di Indonesia cukup banyak. Penggunaan perlit, baik yang diolah hingga expanded perlite maupun yang tidak diolah di Indonesia masih terbatas, tidak seperti di luar negeri yang pemanfaatan perlitnya sudah berkembang untuk berbagai aplikasi. Salah satu upaya pengembangan perlit di Indonesia adalah dilakukannya analisis pasar penggunaan expanded perlite. Tujuan analisis pasar ini untuk mengetahui karakteristik serta peluang pasar expanded perlite baik di dalam negeri maupun ekspor. Metode pengumpulan data dilakukan melalui survei langsung maupun non-survei, sedangkan model pengolahan dan teknik analisis, digunakan pendekatan statistika deskriptif, model analisis tren, dan model analisis ekonomi. Expanded perlite paling banyak digunakan sebagai bahan baku konstruksi, media tanam, filler, dan filter. Peluang pasar domestik antara lain sebagai insulasi dingin atau panas dalam tangki kriogenik, penyemenan dalam pengeboran, bata ringan, mortar, agregat tahan api, plesteran, dan media tanam. Hasil penelitian ini diharapkan dapat menjadi masukan bagi pemerintah maupun pelaku ekonomi dalam merumuskan kebijakannya, agar potensi perlit dapat berkembang berbasis prospektif
ANALISIS KELAYAKAN SUMBERDAYA BATUAN SEBAGAI PELUANG INVESTASI STONE CRUSHER DI DATARAN RENDAH PRAFI
No full textDataran rendah Prafi/Arfak memiliki sumberdaya batuan yang potensial untuk meningkatkan Pendapatan Asli Daerah (PAD) Kabupaten Manokwari. Stone crusher digunakan oleh industri pertambangan skala kecil menengah dalam penyediaan bahan baku batuan dan pasir bagi pembangunan infrastruktur dan jalan di Kabupaten Manokwari, Papua Barat. Metode yang digunakan terdiri dari pengumpulan data primer dan sekunder serta analisis data secara kuantitatif untuk menilai kelayakan investasi stone crusher perusahaan tambang tersebut. Tiga parameter utama yang digunakan dalam penilaian kelayakan investasi adalah NPV (Net Present Value), DPP (Discounted Payback Period), dan IRR (Internal Rate of Return). Hasil analisis diperoleh nilai Net Present Value (NPV) positif sebesar Rp. 57.068.789.003,49, Discounted Payback Period (DPP) selama 2 (dua) tahun 11 (sebelas) bulan dan Internal Rate of Return (IRR) sebesar 40,22%. Hasil analisis kelayakan menunjukkan bahwa investasi stone crusher oleh perusahan pertambangan tersebut adalah layak untuk dioperasikan
EFFECT OF VACUUM RESIDUE AND PETROLEUM BENZINE AS THE ADDITIVE CALORIFIC VALUE AND MOISTURE OF COAL
Get PDFUpgrading the coal is a process that increases the calorific value of low-rank coal through decreasing the moisture content of the coal. This method usually uses mixed heavy oil to close the opened pores after coal upgrading. The additives have a molecule structure like heavy oil. The aim of this study is to determine the effect of additives on the moisture content and calorific value after coal upgrading process. Coal upgrading in this study applies several variations i.e., coal particle size and coal mass mixed with an additive which is a mixture of vacuum residue and petroleum benzine with a ratio of 0.005 g: 1 mL as a coater. Before upgrading process, the moisture content and calorific value of the coal is 13.39 %adb and 6,663 cal/g db. After the process, the lowest moisture content of the coal in the ratio of coal (b/v) and additives was 4:3 with 21.75% ad. The highest calorific value of the coal was shown in the ratio of coal (b/v) and additives 1:1 with 7,189 kcal/kg. The lowest moisture content is indicated by the particle size of -120 mesh. The highest calorific value of coal is shown by the particle size of -120 mesh
DEVELOPMENT OF LATERITE ORE PROCESSING AND ITS APPLICATIONS
Get PDFNickel ore is found in two types sulfide and laterite. The sulfide is a nickel ore that has high nickel content and low reserves of natural resources than of the zinc laterite. In contrast, the laterite is a rock mineral that contains the iron-nickel oxide compounds. There are two methods of processing nickel laterite, namely hydrometallurgy and pyrometallurgy. The former is a method that uses leaching by a chemical solution or solid such as acid, as a reducing agent. The alkaline leaching (ammonia) is the most optimal method to obtain a nickel grade with the highest recovery but it needs more modification. Pyrometallurgical method uses high heat up to 1800°C, so it requires a lot of energy and needs improvement to decrease the carbon usage. The rotary kiln-electric furnace method is the optimal method for developing the nickel laterite. These methods generate products that can be applied to various fields. For example, the pyrometallurgy method produces nickel pig iron and ferronickel as raw materials for stainless steel and steel alloys. The hydrometallurgy method produces nickel sulfate and nickel oxide with a purity of 99% by weight as raw materials for magnets, sensors, and batteries. Hence, the hydrometallurgy method still needs improvements for the environmentally friendly reagent. Therefore, bioleaching will be a nickel laterite leaching process in the future by using bacteria as the reducing agent
GEOTECHNICAL STUDY FOR ANALYZING SLOPE STABILITY BETWEEN TWO MINING PIT BOUNDARY
Get PDFThis paper is a new concept to increase the safety and mining conservation on PT-X and PT-Y with no boundary gap between the two areas. To optimize coal recovery as a basis of supporting conservation, the two companies needed to adjust coal production in terms of avoiding technical problems at the mining time process due to the rock structure and coal seam at the border were the same. PT-X plans to produce 2 million tons of coal, but the government only approved 1 million tons, while PT-Y still approved 2 million tons. This paper discusses the instability of mining in border locations due to the differences of coal production. The applied methodology is conducting geotechnical modeling by considering statistical aspects of data distribution and the probability of failure. Based on the results of geotechnical modeling by numerical methods on the basis of 2D and 3D for the difference in the production level of 1 million tons in all cross-sections, the FK value is 0.992 - 1.248 with a probability of failure (PI) of 5.40 - 48.00%. Results of modeling analysis show that both single and overall slopes are at a critical level and are not safe. If this difference is narrowed by increasing PT-X's coal production by 1.5 million tons, the border location's mining conditions will stabilize. Therefore, it is necessary to propose to the government for PT-X's coal production to be added by at least 500.000 tons so that the production process of each company runs safely