(via TheNewswire)
Four neutralization tests were performed on two final bio-oxidation liquors from the Ecuadorian commercial bioleach testing program, confirming that an environmentally stable ferric arsenate precipitate could be produced. The neutralization process, where limestone is added and calibrated to raise the pH of the bioleach liquor to facilitate the precipitation of the ferric arsenate, conclusively demonstrated that the precipitate passes the TCLP (Toxicity Characteristic Leaching Procedure) requirements for stability set out by the
“These results tick another important box for us, as we formally wrap-up commercial bioleach testing with the information and results needed to press forward and accelerate our feasibility study (FS) and site negotiation efforts,” said
Duplicate neutralization tests were performed on each liquor, using both lime and limestone as the neutralization reagent. Neutralization was conducted in an agitated aerated reactor over a six-hour contact time as per commercial protocol for bio-oxidation plants. Test results showed that the amount of arsenic remaining in solution was 0.5ppm, while the quantity of iron was minimal (between 3ppm to 18ppm due to the presence of residual ferrous iron). This analysis confirms that the neutralization operation will produce a neutral clean water as a by-product that is suitable for recycling in the process. This finding is significant for BacTech as it will reduce the quantity of fresh water required on site.
The Toxicity Characteristic Leach Procedure (TCLP) test is a procedure to evaluate the long -term stability of the arsenic in the precipitate produced by the neutralization process. It is a favoured US
Summary of Liquor Neutralisation and TCLP Test Results
---------------------------------------------------------------------------------------------------- |Test |Bio-oxidation Liquor |Neutralization|Iron and Arsenic |Arsenic in |Arsenic | |No |Iron and Arsenic |Reagent | Remaining in Liquor after|Solid |leached in| | | Concentration. | |Neutralization. | Precipitate.| TCLP. | |--------------------------------------------------------------------------------------------------| |10506|26.87g/l Fe;12g/l As. |Limestone |18ppmFe; 0.5ppmAs |4.9% |1.5ppm | |--------------------------------------------------------------------------------------------------| |10507|29.67g/lFe;11.64g/l As.|Limestone |4ppmFe;0.5ppmAs |5.66% |0.5ppm | |--------------------------------------------------------------------------------------------------| |10508|Same as 10506 |Lime |7ppmFe;0.5ppmAs |4.56% |2.4ppm | |--------------------------------------------------------------------------------------------------| |10509|Same as 10507 |Lime |3ppmFe:0.5ppmAs |4.92% |0.7ppm | ----------------------------------------------------------------------------------------------------
This press release has been reviewed by Dr.
About the
BacTech is planning to build its new owner-operated bioleaching facility in Ponce Enriquez,
BacTech continues to investigate the prospects of establishing additional modern mining operations across other areas of
About
BacTech is a proven environmental technology company, delivering effective and eco-friendly biomining and remediation solutions to commercial operations to smartly process and recover preferred metals (gold, silver, cobalt, and copper) and safely remove and transform harmful contaminants like arsenic into benign
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416-813-0303 ext. 222,
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