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"Mineral sintetis yang terbentuk dari campuran Al,03, LiOH dan SiO, dan dipanggang pada temperatur 1200°C, merupakan bahan yang digunakan pada penelitian ekstraksi lithium ini. Dengan tujuan mengetahui titik optimum waktu proses pelindian dengan menggunakan pelarut KOH di dalam muffle furnace. Selain itu, untuk mengetahui titik optimum laju alir gas CO, dalam proses pengendapan larutan LiOH_ hasil pelindian sampai menjadi endapan LizCO3. Hasil penelitian menunjukkan bahwa terjadi peningkatan produk lithium yang larut membentuk LiOH seiring dengan semakin lamanya waktu pelindian. Dimana waktu optimumnya adalah 90 menit dengan recovery lithium pada proses pelindian sebesar 11.76%. Selain itu, pada proses pengendapan larutan LiOH menjadi endapan LizCO3 mengalami kenaikan recovery lithium seiring dengan kenaikan laju alir gas CO 2. Dimana laju alir optimum adalah 1.5. liter/menit dengan recovery lithium pada proses pengendapan sebesar 63.01%. Sedangkan nilai recovery total proses ekstraksi lithium dari mineral sintetis sampai menjadi endapan LixCO3 adalah sebesar 6.86%.

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Synthetic mineral which formed from the mixture of Al,O3, LiOH and SiO>2 and was roasted at 1200°C, is a material which was used in this lithium extraction research. It is to find optimum time point of the leaching process using KOH solvent in muffle furnace. In addition, to find optimum flow rate point of CO gas in the process of precipitating LiOH solution as the leaching result until it becomes LizCO3 precipitation. The research results show that there is an increase of Li product that dissolved which formed LiOH along with the increase of the length of leaching process. The optimum length is at 90 minutes with recovery lithium. in leaching process as much as 11.76%. In addition, within process of precipitation LiOH solution to be LixCO3 deposition there is an increase of recovery lithium along with the increase of CO» gas flow rate. The optimum flow rate is rate 1.5 litre per minute with recovery lithium at precipitation process value at 63.01%. Whereas the value of the total efficiency of the lithium extracting process from synthetic mineral until it becomes deposition is worth 6.86 %"

"Pada penelitian ini, campuran senyawa LiOH, Al2O3, dan SiO2 telah berhasil dipreparasi melalui dua tahapan proses, yaitu pencampuran selama dua puluh jam dan pembakaran pada temperatur 12000C. Kemudian campuran tersebut diekstraksi melalui proses pelindian menggunakan larutan KOH dan dilanjutkan dengan proses pengendapan menggunakan larutan hangat Na2CO3 dan aliran gas CO2. Pada proses pelindian didapatkan larutan LiOH dimana recovery Li yang didapatkan berbanding lurus dengan variabel temperatur yang digunakan. Hasil optimum proses pelindian didapatkan pada variabel temperatur 2000C dengan nilai recovery Li sebesar 7.13%. Telah dibuktikan pula bahwa pada proses pengendapan recovery Li didalam endapan meningkat seiring dengan meningkatnya rasio Na : Li yang digunakan.

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In this work, the mixture of LiOH , Al2O3, and SiO2 was succesfully prepared by two step, that is mixing about twenty hour and roasting at temperature 12000C. Afterwards, the mixture was extracted by leaching process using KOH solution and then continued by precipitation process using Na2CO3 warm solution and CO2 stream. In the process of leaching, LiOH solution was obtained where recovery of Li which obtained equal with variable of leaching temperature. The optimum yield of leaching process was obtained at temperature 2000C with % recovery 7,13%. It was also proven that’s on precipitation process, Li recovery in precipitate increase as well as increasing of Na : Li ratio."