Test work utilised the proprietary E25 flowsheet for ore from Butcherbird with all impurities below acceptable limits for the production of metal.
Scale-up of flowsheet
This work was completed as part of a progressive scale-up of the processing flowsheet developed in conjunction with the CSIRO for the purpose of extracting manganese from Butcherbird ores.
READ: Element 25 produces high-purity electrolytic manganese metal in initial tests on Butcherbird ore
The company intends to produce high purity manganese, including battery-grade manganese sulphate and HPEMM.
Test work is being carried out as part of an ongoing pre-feasibility study (PFS), which is scheduled for completion later this year.
Element 25’s executive director Justin Brown said “These results are outstanding. To achieve such a high purity on our first attempt to scale up the flowsheet is remarkable and bodes well for the project’s future.”
Hydrometallurgical leach processing and purification tests were conducted on representative PQ diamond core from four drill holes within the Yanneri Ridge resource area.
The work was undertaken by Simulus Laboratories under the supervision of PPM global senior metallurgist Tim Porter.
Chemical composition of the produced EMM based on impurity analysis.
Leach test work utilising Butcherbird ore produced about 270 litres of leach solution containing approximately 44 g/L manganese.
Butcherbird in WA, south of Newman, is a world-class manganese resource with JORC resources in excess of 180 million tonnes of manganese ore.
The company said leaching and purification of the first bulk sample from Butcherbird ore was a key milestone in proving the viability of the industry-leading processing methodology.
In terms of purity, 99.95% manganese is well above the industry standard for EMM of 99.7%.
High-purity, 99.95% Electrolytic Manganese Metal (EMM) flakes produced in the tests.
Success of the test work to date further confirms the process flowsheet, which is a key enabling technology for Element 25’s strategy of producing high-value, high-purity, sustainably produced manganese products from Butcherbird.
Large sample being sourced
PQ diamond drilling is underway at the project to source about 6-tonnes of drill core for the next stage of scale-up test work incorporating multiple large-scale batch tests.
Through this work Element 25 aims to further optimise the process and gain an understanding of any local geometallurgical considerations that should be taken into account during process plant design.
A positive scoping study has been completed with respect to developing the deposit to produce high purity manganese sulphate for lithium-ion battery cathodes as well as HPEMM for use in certain specialty steels.
The PFS is expected to further confirm the commercial potential of the project.