Calcination, Acid Roasting and Water Leaching of spodumene concentrate (reported
Higher than 99% pure lithium carbonate achieved
Approximately 99% Li2O recovered from impurity removal stages
Test work to commence shortly on a direct lithium hydroxide from spodumene concentrate process
The technical grade of Li2CO3 product and recovery of Li2O from flotation concentrates are considered excellent.
A table accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/7ca2450a-33bd-452c-9a91-81b77e41accd
The success of this program has encouraged
A photo accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/b16ff5a3-c69c-43ea-89f7-ae22a6da8334
Table 2 Analysis of the process solutions related with Li2CO3 precipitation tests
Test | Description | Concentration (mg/L) | ||||||||
Li2O | Al | Ca | Fe | K | Mg | Mn | S | Zn | ||
Li₂CO₃T1 | Feed | 39309 | <5 | 134 | <5 | 466 | <5 | <5 | 6888 | <5 |
Filtrate | 3620 | <5 | 10 | <5 | 406 | <5 | <5 | 62140 | <5 | |
WW | 3488 | <5 | 6 | <5 | 27 | <5 | <5 | 5192 | <5 | |
Li₂CO₃T2 | Feed | 35172 | <5 | 6 | <5 | 8 | <5 | <5 | 42060 | <5 |
Filtrate | 3925 | <5 | 16 | <5 | 17 | <5 | <5 | 40320 | <5 | |
WW | 3989 | <5 | 11 | <5 | <5 | <5 | <5 | 2874 | <5 |
Work to date continues to demonstrate a “greener” process: lower temperatures, lower chemical needs, shorter processing times versus incumbent technologies point toward the environmental and CO2 impacts of high grade lithium salts production to be substantially reduced. Reagents and water consumption can be minimized by recycling the process streams such as filtrates, washes, evaporated water and crude products to the Li2CO3 precipitation, impurity removal, and water leaching stages.
When additional test work to convert spodumene concentrate into lithium carbonate is completed, a life cycle assessment for this innovative process is planned, and engineering data will be available to support decision making. A test program to optimize the calcination and roasting portions of the flowsheet to make them even more environmentally friendly is being designed by the company’s President and CEO
”Test work to date has demonstrated that it is possible to modify traditional processes and shortcut lithium carbonate production using innovative out of the box thinking.
The detailed bench test work to develop a flowsheet was conceived and supervised by Dr.
On Behalf of The Board of Directors,
For further information, please contact the Company at:
michaeldehn@unitedlithium.com
www.unitedlithiumcorp.com
About
Forward Looking Statements
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Table 1
Assay of the final lithium carbonate products
Figure 1
Photograph of the final product obtained from test Li2CO3 T1
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