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"ABSTRAK<Ekstratksi tin dari sumber sekunderterbukti menjadi altematifyang atraktifmelihat dari permintaan produksi timah yang tems bertumbuh. Terak timah, yangtergolong sumber sekunder, masih menyisakan timah oksida sekitar 1 sampai 3%.Literature studi menunjukkan, untuk melakukan leaching dari terak timah secaraefektif, formasi silica gel hams di cegah, oleh karenanya asam oksalat dipilih. Empatparameter leaching, konsentrasi asam oksalat, waktu, temperature, dan rasio, dipilihuntuk mengekstrak tin (sebagai target) beserta titanium, tantalum, dan niobium.Eksperimen menunjukan, bahwa parameter leaching paling optimum berada di 24jam waktu leaching, pada 50 C dan 10% rasio cairan dan solid.

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ABSTRACTRecovering tin from secondary resource proves to be an attractivealternative tin resource to help satisfy the ever-growing tin demands. Tin slag,considered as a secondary resource, still consist of tin in the form of oxidesapproximately 1 - 3%. Studies found that in order to leach tin slag effectively theformation of S,ilica gel has to be prevented, hence oxalic acid was chosen as theleaching reagentofor the study. Four leaching parameters, oxalic acid concentration,leaching time, leaching temperature and solid liquid ratio, were tested through theexperiment to extract tin as the primary metal, along with titanium, tantalum andniobium. The experiment concluded that the optimum leaching time is at 24 hourswith a temperature of 50 C at 10% solidiliqvid ratio."

"ABSTRAKNegara Indonesia adalah negara yang kaya akan kandungan unsur mineral berharga pada sumber daya alamnya terhususnya dalam bidang pertambangan. Terak nikel adalah salah satu hasil mentah atau slag dari pemurnian kadar unsur ndash; unsur berharga dimana yang berasal dari perut bumi Indonesia yang didalamnya banyak mengandung mineral berharga seperti Magnetite Fe3O4, Pendlandite Fe,Ni 9S8, Nickel Iron NiFe, dan Bornite CuFeS4. Studi penelitian ini bertujuan untuk mengetahui pengaruh kadar pH terhadap effisiensi pengambilan kadar unsur nikel dan kobalt pada proses pelindian asam ndash; basa menggunakan larutan H2SO4 0,2 M dan NH4OH pada variasi pH yang beragam. Berdasarkan hasil XRD dan AAS, diperoleh hasil yang cukup signifikan pada hasil pelindian pada pH 9.

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ABSTRACTIndonesia is a country rich in the content of valuable mineral elements in its natural resources particularly in the field of mining. Nickel matte is one of the crude or slag results of purifying the precious elements of which are derived from the nature of the Indonesian earth in which it contains many valuable minerals such as Magnetite Fe3O4, Pendlandite Fe,Ni 9S8, Nickel Iron NiFe, and Bornite CuFeS4. This research study aims to determine the effect of pH levels on the efficiency of taking the element content of nickel and cobalt in the acid base leaching process using a solution of H2SO4 0.2 M and NH4OH on various pH variations. Based on XRD and AAS results, significant results were obtained in leaching results at pH 9. "