Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
Not a member yet
1014 research outputs found
Sort by
DEALCALIZATION OF SOUTHERN CIANJUR BENTONITE USING AMMONIUM HYDROXIDE AND CITRIC ACID
No full textDealcalization of southern Cianjur bentonite has been done to improve bentonite quality by reducing the alkali element (Na and Ca) content as impurities. The experiment used ammonium hydroxide and citric acid. The reaction parameters such as particle size, solution concentration, percent solid, time and contact temperature were optimized. Results of dealcalization using ammonium hydroxide ob- tained the optimum condition at particle size of -200+325 mesh, concentration of 4 N, percent solid of 10%, contact time of 36 hours and temperature of 100oC with recovery as much as 32.55% for Na and 29.14% for Ca. Meanwhile, dealcalization using citric acid, got optimum condition at particle size of - 325 mesh, concentration of 2N, percent solid of 10%, contact time of 24 hours, temperature of 100oC with recovery as much as 33.01% for Na and 30.07% for Ca. The results also showed that both solutions gave better recovery for Na rather than for Ca. In conclusion, experiment using citric acid was better than using ammonium hydroxide as demonstrated by its higher recovery of alkali elements. However, results of this work have not met the standards of bentonite for catalyst hydrocarbon crac- king
MARKET STUDY OF COMPOUND FERTILIZER-BASED MINERAL AT TEA PLANTATION IN BANDUNG REGENCY
No full textThe study of this research is to identify the market possibility of compound mineral fertilizer in Bandung Regency. The methodology used is survey method by using analysis model of market measurements. From the analysis and discussion, it can be identified the estimate of substantial potential of fertilizer market on tea plantation in Bandung Regency of IDR 111,070,309,152 with minimum market is IDR 74,742,993,050 or 67.29% from the total potential of fertilizer market as market penetration index. Meanwhile, the remains of 32.71% is market sen- sitivity area towards fertilizer demand. The estimate of the fertilizer demand is IDR 50,391,725,914 or 67.42% to a minimum market or 45.37% to potential market, and the remains of 54.63% is the market development opportunities in the future. Meanwhile its fertilizer competitor’s are Urea, SP 36, KCL, Kieserite, NPK (sodium, phosphate and potassium), MOP (muriate of potash) and ZK (zheng and potassium). Based on the questionnaire results to 97 respondents about the characteristics and perceptions of fertilizer consumers, it is formulated mix marketing of product aspects such as the physical form of mineral fertilizers is granulees. There are 2 types of packaging, 25 kgs and 50 kgs, and its long shelf life is between 3-6 months. The selling price of end consumers is under IDR 5,000 with payment system can be used in credit. Meanwhile, promotion is carried out directly at the experimental garden, by conducting distribution through two channels, namely cooperatives and agents/ distributors. According to overall analysis results, it can be concluded that by reviewing market and competition aspects, research and development of manufacture technology of compound fertilizer-based mineral is reason- able to be continued to the next stage in the commercialization process of technology
PENYIAPAN SERBUK KOMPOSIT KORUNDUM - TITANIUM KARBIDA (AL2O3- TiC) SEBAGAI BAHAN ABRASIF
No full textProduksi bahan abrasif belum ada di Indonesia dan bahan tersebut masih diimpor. Karena itu penelitian pembuatan komposit korundum - titanium karbida (Al2O3-TiC) sebagai bahan baku abrasif berupa serbuk telah dilakukan menggunakan campuran alumina dan titania melalui reaksi aluminotermik. Komposit dibuat dengan mereaksikan Al(OH)3, Al2O3 dan serbuk logam Al sebagai sumber Al, dan TiO2, Ti(OH)4 sebagai sumber Ti, serta sukrosa sebagai sumber karbon dengan variasi temperatur pembakaran reduksi pada suhu 1000 °C, 1300 °C dan 1450 °C. Secara visual komposisi (K-3) memberikan hasil terbaik dengan homogenitas warna abu-abu tua (indikasi adanya karbon bebas) pada suhu kalsinasi 800 °C. Hasil analisis X-RD terhadap kompositK-3 yang teridentifikasi ada 4 mineral utama yaitu korundum, rutil, anatase dan aluminium titanium oksida. Sedangkan fasa titanium karbida (TiC) pada komposit tersebut muncul dengan intensitas sangat kecil pada sudut 2q sekitar 36,4o dan 42o. Hasil analisis SEM Mapping menunjukkan intensitas dari elemen aluminium, titanium dan karbon yang cukup tinggi pada suhu pembakaran optimum 1450 oC. Komposisi kimia yang diperoleh dari analisis SEM X-Ray secara kuantitatif terhadap komposit K-3 adalah: Al2O3 18,74 %; TiO269,36 %;C 5,56 % dan sisanya sebesar 6,34 % adalah TiC yang diduga bersifat amorf. Komposit (Al2O3-TiC) yang dihasilkan masihbelum memenuhi harapan disebabkan kondisi suhu pembakaran reduksinya sulit dipertahankan sehingga kemungkinan Al2O3-TiC yang terbentuk semakin kecil dan cenderung membentuk Al2O3- TiO2