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All Journal Seminar Nasional Teknik Kimia Kejuangan Metal Indonesia Indonesian Journal of Chemistry REACTOR : Journal of Research On Chemistry And Engineering JHeS (Journal of Health Studies) Scientica: Jurnal Ilmiah Sains dan Teknologi
Trisnawati, Iga
Sebelas Maret University
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Mechanical Engineering Nursing Public Health Social Sciences Other

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Optimasi Presipitasi Logam Tanah Jarang dari Campuran Konsentrat Logam Tanah Jarang dengan Metode ”Response Surface Methodology” Akbar Yulandra; Iga Trisnawati; I Made Bendiyasa; Wahyu Rachmi pusparini; Himawan Tri Bayu Murti Petrus
Jurnal Metal Indonesia Vol 42, No 1 (2020): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (698.025 KB) | DOI: 10.32423/jmi.2020.v42.28-34

Abstract

Dua sumber LTJ berasal dari mineral seperti monasit dan senotim. Ketersediaan LTJ di kerak bumi relatif sedikit, tersebar dan jarang terjadi dalam bentuk bijih. Dalam penelitian ini bahan baku yang digunakan adalah campuran konsentrat LTJ yang berasal dari PT. Monokem Surya. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh konsentrasi H2C2O4, kecepatan pengadukan dan suhu terhadap kemurnian dan pemungutan LTJ dari campuran konsentrat LTJ. Percobaan dilakukan dalam lima langkah: (1) Fusi alkali, proses dilakukan selama 3 jam pada suhu 450oC, dengan rasio padatan NaOH terhadap campuran konsentrat LTJ sebesar 1:1, untuk memutuskan ikatan fosfat; (2) ) Pelindian fosfat dalam produk fusi alkali menggunakan aquadest pada suhu 80oC; (3) Residu pelindian aquadest dilakukan proses perlindian menggunakan 6 M HCl selama 2 jam untuk melarutkan LTJ pada 90oC; (4) Menghilangkan kotoran seperti uranium dan thorium dengan mengendapkannya menggunakan NH4OH pada pH 1; (5) Presipitasi LTJ dari filtrat yang dihasilkan dari butir (4) menggunakan H2C2O4. Didapatkan hasil LTJ dengan kemurnian 96% dan pemungutan sebesar 95% pada konsentrasi H2C2O4 8,11%, kecepatan putar pengaduk 500 rpm, dan suhu 70oC.Two sources of REEs are from mineral monazite and xenotime. The availability of REEs is relatively abundant in the earth’s crust, typically dispersed, and rarely occur in ores. In this study as raw material was a mixed rare earth concentrate from Monokem Surya Ltd. The purposes of this research were to determine the effect of concentration H2C2O4, stirring speed, and temperature regarding to purity and recovery REEs from the mixed rare earth concentrate. The experiments were conducted in five steps:(1) Alkaline fusion, the process was performed about 3 hours at 450oC, with ratio of NaOH solid to the mixed rare earth concentrate sand was 1:1, in order to break phosphate bonds;(2) Leaching of phosphate in alkaline fusion product using aquadest at 80 oC; (3) Aquadest leaching residue was leached using 6 M HCl for 2 hours to dissolve REEs at 90 oC; (4) Removal of impurities such as uranium and thorium by precipitating them using NH4OH at pH 1; (5) Precipitation of REEs from filtrate produced from point (4) using H2C2O4. The results of REEs with 96% purity and 95% recovery was obtained at concentration H2C2O4 8,11%, stirring speed 500 rpm, and temperature 70oC.
Ekstraksi Logam Tanah Jarang (LTJ) dan Logam Berharga Hasil Fusi Alkali Tailing Zirkon Gyan Prameswara; Panut Mulyono; Agus Prasetya; Herry Purnomo; Iga Trisnawati
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

HUBUNGAN PERSEPSI DENGAN MOTIVASI UNTUK STUDI LANJUT S2 KEBIDANAN Iga Trisnawati; Ym. V. Mudayen; Dheska Arthyka Paliviana
JHeS (Journal of Health Studies) Vol 1, No 2: September 2017
Publisher : Universitas 'Aisyiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (243.164 KB) | DOI: 10.31101/jhes.262

Abstract

Abstrak: Penelitian ini bertujuan untuk mengetahui hubungan persepsi dengan motivasi untuk studi lanjut S2 Kebidanan pada mahasiswa semester VIII program studi D-IV Bidan Pendidik Universitas Respati Yogyakarta tahun 2015. Jenis penelitian deskriptif analitik dengan pendekatan crossectional. Teknik pengambilan sampling yaitu proportional random sampling sebanyak 125 mahasiswa. Data dianalisis dengan menggunakan uji Kendall Tau. Hasil penelitian ini menunjukan 94 responden (75,2%) memiliki persepsi cukup positif dan 83 responden (66,4%) memiliki motivasi sedang. Diperoleh zhitung lebih besar dari  ztabel  (7,96 1,960) dan signifikansi sebesar 0,000 lebih kecil dari 0,05 (p-value 0,05) dengan keeratan hubungan yang kuat (=0,478). Kata kunci: Persepsi, Motivasi dan Studi Lanjut S2 Kebidanan
Kinetics Study of Yttrium Leaching from Zircon Tailings Using Sulfuric Acid Harry Supriadi; Iga Trisnawati; Tri Handini; Sri Rinanti Susilowati; Vincent Sutresno Hadi Sujoto; Panut Mulyono; Himawan Tri Bayu Murti Petrus
Indonesian Journal of Chemistry Vol 23, No 2 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79966

Abstract

From the analysis of zircon tailings using X-Ray Fluorescence (XRF), Yttrium is a rare earth element (REE) with the highest concentration compared to other REEs. The purpose of this study is to determine the best kinetic model for describing how sulfuric acid extracts Yttrium from zircon tailings. Leaching temperatures of 200, 250, and 300 °C were used to determine the kinetics. Samples were obtained at 0, 20, 40, 60, 80, 100, and 120 min for each temperature. This study discovered that the chemical reaction model's kinetics are the most closely related to those of the leaching process. The evaluation of the model utilizing the coefficient of determination (R2) on the relationship between each model and time lends support to this conclusion. The activation energy (Ea) of the leaching process is determined by the Arrhenius plot between ln k and 1/T. In the Yttrium leaching procedure, the Ea value is 14.42 kJ/mol. The chemical reaction model was in charge of the leaching process, according to the Ea value. The premise of the chemical reaction model is that chemical reactions regulate the rate of the reaction.
Efek Pre-Roasting Terhadap Parameter Kinetika Leaching Cr dari Limonit Gyan Prameswara; Andi Nurfaadilah Ulfah; Cipta Panghegar Supriadi; Iga Trisnawati; Himawan Tri Bayu Murti Petrus
REACTOR: Journal of Research on Chemistry and Engineering Vol 4, No 2 (2023): Published in December 2023
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v4i2.97

Abstract

Hydrometallurgical processes such as leaching of limonite ore to extract valuable metals including Ni and Co are often non-selective, including other metals in the leachate product. The leaching behavior of Cr from the chromite mineral contained in limonite ore is of concern due to the high Cr content of the leachate effluent. The pre-roasted process is frequently used to pre-treat limonite to increase the precious metal content. This study aims to determine the leaching behavior of Cr and the effect of pre-roasting on its kinetic parameters. The pre-roasting process was carried out at 280 and 610 oC for 4 hours. Observation of Cr leaching behavior was carried out in the leaching temperature range of 30-90 oC for 0-120 minutes using sulfuric acid solvent. The highest Cr recovery was achieved in pre-roasted ore leaching at 610 oC with leaching operating conditions of 2 M sulfuric acid, solid-liquid ratio of 5 g/50 mL, 200 rpm, for 120 minutes, at a leaching temperature of 90 oC, under these conditions Cr recovery reached 53.16%. The higher the roasting temperature, the lower the activation energy required for the leaching process. Cr leaching from raw and pre-roasted ore is controlled by the diffusion process through the ash layer with activation energies (EA) of 21.41, 18.64, and 14.71 kJ/mol for raw ore, pre-roasted ore 280 oC, and pre-roasted ore 610 oC, respectively. The comparison of kinetics data from several roasting products for atmospheric leaching feeds will provide industry with information to integrated pyro-hydrometallurgical process to increase Cr production from laterite.
OPTIMALISASI PRODUKSI OLIGOMER DARI KITOSAN HASIL EKSTRAKSI KEPALA UDANG MENGGUNAKAN APLIKASI IRADIASI GAMMA Trisnawati, Iga; Kurniawan, Deni; Ajri, Fauziah Ulfah; Sinurat, Febriyanti
Scientica: Jurnal Ilmiah Sains dan Teknologi Vol. 2 No. 8 (2024): Scientica: Jurnal Ilmiah Sains dan Teknologi
Publisher : Komunitas Menulis dan Meneliti (Kolibi)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.572349/scientica.v2i8.2262

Abstract

Limbah kepala dan cangkang udang sering dibuang dan menimbulkan masalah lingkungan. Limbah mengandung kitin, yang dapat diolah menjadi kitosan. Iradiasi gamma meningkatkan efisiensi produksi kitosan. Ini mempercepat ekstraksi kitin menjadi kitosan dan mendegradasi kitosan menjadi oligomer. Oligomer memiliki peran penting dalam industri dan nilai jual lebih tinggi. Penelitian ini bertujuan untuk mengoptimalkan produksi oligomer dari kitosan yang diekstraksi dari limbah udang menggunakan iradiasi gamma dengan dosis iradiasi dan konsentrasi asam asetat yang optimal sebagai langkah efisiensi proses degradasi kitosan menjadi oligomer. Kitosan dipreparasi dengan deproteinasi, demineralisasi, dan deasetilasi. Validasi kitosan dilakukan dengan uji organoleptik, sifat fisis, dan FTIR, sesuai Standar Nasional Indonesia No. 7949 Tahun 2013. Oligomer kitosan dibuat dengan ekstraksi kitosan dalam asam asetat dengan iradiasi gamma pada dosis 0, 10, 20, 30, dan 50 kGy serta konsentrasi asam asetat 2%, 5%, 10%, 15%, dan 20%. Hasil penelitian menunjukkan iradiasi 50 kGy efektif mengubah kitosan menjadi oligomer.
Efek Pre-Roasting Terhadap Parameter Kinetika Leaching Cr dari Limonit Prameswara, Gyan; Ulfah , Andi Nurfaadilah; Supriadi , Cipta Panghegar; Trisnawati, Iga; Petrus, Himawan Tri Bayu Murti
REACTOR: Journal of Research on Chemistry and Engineering Vol. 4 No. 2 (2023)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v4i2.97

Abstract

Hydrometallurgical processes such as leaching of limonite ore to extract valuable metals including Ni and Co are often non-selective, including other metals in the leachate product. The leaching behavior of Cr from the chromite mineral contained in limonite ore is of concern due to the high Cr content of the leachate effluent. The pre-roasted process is frequently used to pre-treat limonite to increase the precious metal content. This study aims to determine the leaching behavior of Cr and the effect of pre-roasting on its kinetic parameters. The pre-roasting process was carried out at 280 and 610 oC for 4 hours. Observation of Cr leaching behavior was carried out in the leaching temperature range of 30-90 oC for 0-120 minutes using sulfuric acid solvent. The highest Cr recovery was achieved in pre-roasted ore leaching at 610 oC with leaching operating conditions of 2 M sulfuric acid, solid-liquid ratio of 5 g/50 mL, 200 rpm, for 120 minutes, at a leaching temperature of 90 oC, under these conditions Cr recovery reached 53.16%. The higher the roasting temperature, the lower the activation energy required for the leaching process. Cr leaching from raw and pre-roasted ore is controlled by the diffusion process through the ash layer with activation energies (EA) of 21.41, 18.64, and 14.71 kJ/mol for raw ore, pre-roasted ore 280 oC, and pre roasted ore 610 oC, respectively. The comparison of kinetics data from several roasting products for atmospheric leaching feeds will provide industry with information to integrated pyro-hydrometallurgical process to increase Cr production from laterite.
Co-Authors Agus Prasetya Ajri, Fauziah Ulfah Akbar Yulandra Andi Nurfaadilah Ulfah Bhisma Murti Cipta Panghegar Supriadi Deni Kurniawan, Deni Dheska Arthyka Paliviana Gyan Prameswara Harry Supriadi Harsono Salimo Herry Purnomo Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus I Made Bendiyasa Paliviana, Dheska Arthyka Panut Mulyono Panut Mulyono Sinurat, Febriyanti Sri Rinanti Susilowati Supriadi , Cipta Panghegar Tri Handini Ulfah , Andi Nurfaadilah Vincent Sutresno Hadi Sujoto Wahyu Rachmi pusparini Y.M.V Mudayen Ym. V. Mudayen