AMMG provides update on its High Purity Alumina (HPA) optimisation test work and bulk samples

Australia Minerals and Mining Group Limited provides an update on the progress of the current high purity alumina (HPA) optimisation test work conducted by AMMG's specialist engineering consultants as well as the commencement of the bulk sample program for potential off-take customers.

The last remaining stages of the Test Work are nearing completion and further updates will be announced upon completion.

AMMG and the Consultants have commenced the bulk sample production program, which aims to produce a large trade sample of approximately 20kgs of 4N HPA for despatch to international end-users and potential off-take customers.

Based on the preliminary assay results of the intermediate aluminium chloride, which indicated a purity of 99.99%, the subsequent final HPA product's target purity of 99.99% (4N) aluminium oxide (Al2O3) should be achievable.

Following the two final stages of calcination and washing within the process, the assay results of the final HPA should verify that the product is of the desired purity level provided no outside contaminants were introduced during these final stages.

The Test Work has identified considerable efficiencies to streamline the process by way of optimising reagent concentrations, solid-liquid ratios, temperatures as well as the consolidation of solid/liquid separation and washing equipment.

The initial leaching phase of AMMG's process was successfully conducted on a continuous basis, which confirmed its capacity for the full-scale processing pilot plant. Further, lower- than-expected optimal leaching temperatures were determined, which reduces the energy consumption.

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