?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+TEMPERATUR+DAN+WAKTU+REDUKSI+TERHADAP%0D%0APERUBAHAN+FASA+BIJIH+MANGAN+DARI+NUSA+TENGGARA+TIMUR%0D%0AMENGGUNAKAN+ARANG+KAYU+SEBAGAI+REDUKTOR&rft.creator=SOFHIA+CHAIRUNNISYA%2C+1417041087&rft.subject=500+ilmu+pengetahuan+alam+dan+matematika&rft.subject=530+Fisika&rft.description=Telah+dilakukan+penelitian+mengenai+pengaruh+temperatur+dan+waktu+reduksi%0D%0Aterhadap+perubahan+fasa+bijih+mangan+dari+Nusa+Tenggara+Timur+menggunakan%0D%0Aarang+kayu+sebagai+reduktor.+Reduksi+bijih+mangan+dilakukan+dengan+metode%0D%0Apirometalurgi.+Pada+tahap+pertama+dilakukan+reduksi+dengan+variabel+temperatur%0D%0A900%2C+1000%2C+dan+1100+%C2%B0C+dengan+waktu+reduksi+dibuat+tetap+yaitu+15+menit.+Setelah%0D%0Aitu+dilakukan+proses+reduksi+dengan+variabel+waktu+reduksi+30%2C+45%2C+60%2C+dan+75%0D%0Amenit+menggunakan+temperatur+terbaik+yang+diketahui+dari+tahap+sebelumnya.%0D%0AHasil+analisis+XRF+menunjukkan+bahwa+temperatur+dan+waktu+reduksi%0D%0Aberpengaruh+pada+peningkatan+kadar+Mn+pada+bijih+Mangan.+Kadar+Mn+tertinggi%0D%0Amencapai+77%2C985+%25+didapatkan+menggunakan+temperatur+1100+%C2%B0C+dan+waktu%0D%0Areduksi+45+menit.+Hasil+karakterisasi+XRD+menunjukkan+bahwa+raw+material%0D%0Abijih+mangan+setelah+direduksi+mengalami+perubahan+fasa+dan+struktur+mineral.%0D%0APerubahan+fasa+yang+terjadi+adalah+fasa+pyrolusite+(MnO2)+menjadi+fasa+bixbyite%0D%0A(Mn2O3)%2C+braunite+(Mn2SiO4)+dan+Hausmannite+(Mn3O4).+Perubahan+struktur%0D%0Amineral+yang+terjadi+adalah+pyrolusite+dan+bixbyite+berbentuk+kubik+menjadi%0D%0Abixbyite%2C+braunite%2C+dan+hausmannite+berbentuk+tetragonal.+Model+kinetika+yang%0D%0Asesuai+merepresentasikan+reduksi+bijih+Mn+pada+penelitian+ini+adalah+model%0D%0Akinetika+Ginstling-Brounshtein+dengan+energi+aktivasi+(Ea)+yang+didapat+sebesar%0D%0A9%2C573+kkal%2Fmol%2C+sehingga+laju+reduksi+dikendalikan+oleh+reaksi+kimia+dan+difusi%0D%0Agas.%0D%0AKata+Kunci+%3A+Bijih+Mangan%2C+Perubahan+Fasa%2C+Reduksi%2C+Struktur+Mineral.%0D%0AEffect+of+temperature+and+reduction+time+to+phase+transformation+on+east+nusa%0D%0Atenggara+manganese+ore+using+charcoal+as+reductant+has+been+researched.%0D%0AReduction+of+manganese+ore+was+carried+out+by+pyometallurgy+method.+In+the+first%0D%0Astep%2C+reduction+was+carried+out+with+temperature+variables+of+900%2C+1000%2C+and%0D%0A1100+%C2%B0C+with+the+reduction+time+being+fixed+at+15+minutes.+After+that+the+reduction%0D%0Aprocess+is+carried+out+with+the+reduction+time+variables+30%2C+45%2C+60%2C+and+75+minutes%0D%0Ausing+the+best+temperature+known+from+the+previous+stage.+The+X-Ray%0D%0AFluorescence+(XRF)+characterization+result+showed+that+the+temperature+and+the%0D%0Areduction+time+influeced+increasing+Mn+content+on+manganese+ore.+The+highest%0D%0AMn+content+reaching+77.985%25+was+obtained+using+a+temperature+1100+%C2%B0+C+and+a%0D%0A45+minute+reduction+time.+The+X-Ray+Diffraction+(XRD)+characterization+result%0D%0Ashowed+that+raw+material+of+manganese+ore+reduced+after+being+reduced+had%0D%0Atransformation+of+phase+and+structure+mineral.+The+transformation+phase+that%0D%0Aoccur+were+the+pyrolusite+(MnO2)+phase+became+the+bixbyite+(Mn2O3)%2C+braunite%0D%0A(Mn2SiO4)+and+Hausmannite+(Mn3O4)+phases.+The+transformation+in+mineral%0D%0Astructures+that+occur+were+pyrolusite+and+bixbyite+in+the+form+of+cubic+to+bixbyite%2C%0D%0Abraunite%2C+and+Hausmannite+in+the+form+of+tetragonal.The+suitable+kinetic+model%0D%0Awith+activation+energy+(Ea)+obtained+at+9%2C573+kcal+%2F+mol.+The+rate+of+reduction%0D%0Awas+controlled+by+chemical+reaction+and+gas+diffusion.%0D%0AKeywords%3A+Manganese+Ore%2C+Phase+Transformation%2C+Reduction%2C+Mineral+Structure.&rft.publisher=FAKULTAS+MATEMATIKA+DAN+ILMU+PENGETAHUAN+ALAM&rft.date=2019&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F57534%2F1%2F1.%2520ABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F57534%2F2%2F2.%2520SKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F57534%2F3%2F3.%2520SKRIPSI%2520FULL%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++SOFHIA+CHAIRUNNISYA%2C+1417041087++(2019)+PENGARUH+TEMPERATUR+DAN+WAKTU+REDUKSI+TERHADAP+PERUBAHAN+FASA+BIJIH+MANGAN+DARI+NUSA+TENGGARA+TIMUR+MENGGUNAKAN+ARANG+KAYU+SEBAGAI+REDUKTOR.++FAKULTAS+MATEMATIKA+DAN+ILMU+PENGETAHUAN+ALAM%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F57534%2F