CD shopping page |
2011-Sustainable Industrial Processing Summit
|
| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 754 pages |
| ISBN: | 978-0-9879917-3-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Processing Of Lithium-bearing Wastes To Obtain Li2CO3
Jitka Jandova1; jan kondas2; Lubos Havlak3; Petr Dvorak4;1PRAGUE INSTITUTE OF CHEMICAL TECHNOLOGY, Prague, Czech Republic; 2SAFINA A.S., VíDE?SKá 104, JESENICE AT PRAGUE,, , Czech Republic; 3INSTITUTE OF PHYSICS AS CR, NA SLOVANCE 2, , Czech Republic; 4DEPARTMENT OF METALS AND CORROSION ENGINEERING, , Czech Republic;
Type of Paper: Regular
Id Paper: 246
Topic: 12
Abstract:
At the present time subsurface brines are the dominating raw material for lithium carbonate production worldwide because of lower production costs as compared with processing costs for lithium ores and other lithium-bearing raw materials. However, due to rising demand for lithium that materials appear to be economically feasible for the production of Li2CO3. In this study processes based on roasting-leaching-crystallization steps and condensation-precipitation- steps, respectively for Li2CO3 separation from spent Li/MnO2 batteries and lithium-containing wastewaters, respectively were developed and verified on a laboratory scale. Spent Li/MnO2 batteries were roasted under reduced pressure at 650°C, which split the castings and deactivated the batteries by reduction of LiMnO2 and MnO2 with residual lithium metal and graphite to form MnO and Li2CO3. The resultant lithium carbonate was selectively solubilized in water with manganese remaining in the leach residue. Li2CO3 of 99.5% purity was obtained after evaporation of 95% water. Processing of lithium-containing alkaline wastewaters from the production of liquid rubber comprises condensation up to lithium concentration of 10-12 g/l Li and two- step precipitation of lithium carbonate using CO2 as a precipitation agent. Sparingly soluble Li2CO3 was obtained in the second step at 95°C, whilst most impurities remain in the solution. Obtained lithium carbonate products contained from 98.6 to 99.7% Li2CO3 depending on the purity of processed wastewaters and lithium concentration in the original solutions.