Articles

Found 2 Documents
Search
Journal : Seminar Nasional Teknik Kimia Kejuangan

Aktivasi Zeolit Alam Lampung sebagai Adsorben Karbon Monoksida Asap Kebakaran Yuliusman, Yuliusman
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Prosiding Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (526.62 KB)

Abstract

This study aims to absorb the carbon monoxide (CO) gas using Lampung natural zeolite as an adsorbent. Natural Zeolite has porous crystal structure, large surface area, high thermal stability, non-toxic, and effective. Natural zeolites contain many impurities, then it must be activated. Activation of natural zeolite was done by soaking in a solution of 2% HF for 10 minutes with stirring. Furthermore, dealumination natural zeolite carried out  by soaking in a solution of 6 M HCl for 30 minutes. Zeolite was soaked with a solution of 0.1 M NH4Cl and then was calcined.  Then Activated Natural zeolite was tested the adsorption of cabon monoxide gas from burning tissue paper. Variations in particle size of the zeolite is 53-106 μm, 106-150 μm and 150-212 μm. The results showed that activated natural zeolite with a particle size of 53-106 microns can adsorb CO gas at 379 ppm (12.2%) of the initial concentration for 20 minutes.
Pengambilan Kembali Logam Litium dan Cobalt dari Baterai Li-Ion dengan Metode Leaching Asam Sitrat Yuliusman, Yuliusman
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Prosiding Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.449 KB)

Abstract

Batteries are often used in mobile phones is a type of battery Li-Ion or Lithium Ion Battery (LIB). Cobalt and lithium used in batteries is important metal that is often used in various fields. Batteries that are not used become hazardous waste. Metal recovery from waste batteries is one solution to maintain the availability of raw materials of lithium and cobalt. In this study the recovery of lithium and cobalt was done with leaching method, which dissolves metals from the waste battery into the leaching agent. Citric Acid (C6H8O7) was used as the leaching agent, because it is one of the organic acids that can be used in the leaching process lithium. The results showed that the metal content in batteries LIB 35.30 ppm lithium metal and 408.55 ppm cobalt metal. The concentration of leaching agent take effect on the percentage of leaching. The optimum operating conditions for the leaching process is at a concentration of citric acid of 1.5 M; with a contact time of 30 minutes and a temperature of 55 ° C.  In these conditions, the optimum percentage was obtained for the leaching of metal lithium and cobalt are 98.08% and 86.28%, respectively, respectively.