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[posting]61098820[/posting]"St-Georges’ Process: Selective Leaching with Nitric Acid Leaching with a passivating acid normally used to clean steel and passivate the welds of stainless steel was performed in the hope of selectively removing the magnesium (Mg) and all the salt metals like sodium (Na), calcium (Ca), lithium (Li) and magnesium (Mg). The initial results with a 4-hour leach showed that all the salt metals and carbonate formations leached easily. This follows the logic of cleaning acid and leaves most of the other elements behind, such as silica (Si), alumina (Ai), potassium (K). Multiple 1-hour leach tests confirmed the leaching of 100% of the lithium leaving behind most of the leachable elements from other acids such as potassium (K). The only loss of lithium that occurred during some of these tests was due to the water in the filter with the solids and represented less than 0.03% of the total lithium value. It also corresponds directly to the water retained with this type of fine material. Additional trials are being performed with reduced time of contact and temperature to optimize the lithium-bearing fines leaching. The lithium in the super fines leached completely in each test performed with nitric acid. The trials to selectively optimize leaching the lithium with less calcium and magnesium are expected to be performed in the third quarter of 2019. It is expected that calcium can be reduced partially by filtering the coarser calcium formation as per SGS results and partially with less contact time with the acid. The same for magnesium. New samples will be treated once received. Considering the results obtained, St-Georges is working on strategic partnerships for new organics mediums and resins that can work with nitric acid to selectively collect the lithium, as well as for electrolysis with nitric acid mediums. The Company also started to work on optimizing a new technology related to filter presses to reduce the facility size and environmental footprint, and to decrease chemicals usage and waste disposal. The new filter press design will be completed and available for viewing within two months. It is too early to know if this development initiative will result in intellectual property that can be patented." |
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| aus der Diskussion: | Spannende Lithium Wundertüte mit starken ppm Werten - in Deutschland noch nicht auf dem Schirm |
| Autor (Datum des Eintrages): | phobieeee (24.07.19 21:34:23) |
| Beitrag: | 7,493 von 12,258 (ID:61098949) |
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