Kinetika reaksi pemungutan senyawa kalium dari jarosit dan asam sulfat
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 1997
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/18573/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=1365 |
Daftar Isi:
- ABSTRACT The need for potassium fertilizers are almost entirely fulfilled by importing those commodities from other countries. Efforts to produce neutral fertilizers from ash extract were promising but collecting the ash was very difficult. On the other hand in West Java there are found potassium mineral deposits which are quite potential. However, the jarosit mineral is not soluble in water. In this investigation, jarosit was treated with sulfuric acid to get soluble potassium compounds. The experiment was started with pouring 150 mL of 8 N sulfuric acid solution into a beaker glass provided with buffles, stirrer, thermometer, and water bath, and then jarosid powder was added slowly with constant stirring. At the end of the experiment the mixture was filtered and the filtrate and washing were diluted to a certain volume. The soluble potassium was determined gravimetrically with sodium cobaltinitrite solution. This process was quite successful. The soluble potassium compound increased with time and molar H2SO4-K2O ratio, but the sulfuric acid conversion deareased with the reactant ratio. Treating jarosit with sulfuric acid solution followed pseudo first order reaction with respect to sulfuric acid. Using 25 g jarosit powder, 150 mL of 8 N sulfuric acid solution, 90°C of temperature, and 800 rpm of stirring, the optimum time and molar ratio of H2SO4-K20 were 150 mintes and 12.06 gmole/gmole, respectively. Under these conditions, the potassium recovered was 80.16 %, while the sulfuric acid conversion was 3898 %.