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Mining3’s Alternative Explosives Project finding the right formula

Environmental, Explosives and blasting, Mining consumables, Mining equipment, Mining services, Sustainable mining, , , , , , , , , , ,

Later this year, Mining3 is to demonstrate to funding supporters and commercialisation partners a significant ACARP-funded project milestone of a number of blasts in rock with hydrogen peroxide-based emulsion explosive at an increasing scale of production.

While rock-breakage displays in Queensland quarries with alternative explosives formulations were completed back in 2016, those formulations were proof-of-principle tests for a hydrogen peroxide-based explosive. The project has moved on significantly since then.

“Last year we completed a complete suite of United Nations (UN) authorisation tests to confirm that the new emulsion formulation has a feasible classification as a commercially viable product,” Mining3 said. “Our prior hydrogel-based formulations, whilst demonstrating rock-breakage potential, did not pass UN classification and have been abandoned.”

Last year, Mining3 and western New South Wales-based independent explosives testing partner, Rurex, comprehensively tested the novel emulsion formulation. The outcome of UN testing is a portfolio of results that, Mining3 says, will assist explosives delivery companies to apply for authorisation within their regulatory jurisdictions for the new emulsion formulation. Three series of tests were conducted to ensure that the new formula was safe to use regarding fire, impact, friction and heating.

Mining3 said: “We reported UN classification for a Class 1.1D UN0241 explosive as a significant achievement last year. But what the data doesn’t show is the countless failed trials and white knuckles that the researchers had when conducting the authorisation tests. Any single failure can scuttle the formulation from advancing to commercial application, and represented in some formulas, such as all the failed hydrogel formula, hundreds of hours of research. Whilst it is relatively easy to make a hydrogen peroxide-based explosive, the heightened energetics of the oxidiser was a challenge to make a safe explosive that is acceptable to industry.”

With the confidence of a supportive suite of UN test results, Mining3 says it is assured of commercialisation with the new emulsion formulation.

Following on from the UN test results, Sydney-based mining equipment manufacture, Elquip, has developed a prototype 500 kg duo-batch-mixer to produce the volumes of explosive material for mine site bulk trials. It has been an equally challenging path to a safe and effective mixer for a model of on-site, on-demand emulsion explosives manufacture.

An image from the Elquip prototype hydrogen peroxide-based Emulsion Mixer commissioning trials at Rurex, in western NSW, in July 2022. “We always take a safety-first approach in our research, so, in the pictured trial and initial commissioning tests, we used full body hazchem suites,” Dr Andrew Kettle says (photo courtesy of Ryan Esam, Rurex)

Scaling from the laboratory bench to the mine bench explosive formula manufacture is a journey requiring all the caution imaginable, and some unimagined. “Elquip has embraced the adventure and positioned themselves as the preferred equipment supplier aligned to the near-horizon commercialisation pathway,” Mining3 says. The specificity of hydrogen peroxide material compatibility, equipment design and safety for a hydrogen peroxide-based explosive has been captured by Elquip, ensuring its equipment and support of the Mining3 research projects is successful. Commissioning of the first prototype batch mixer was conducted at Rurex last year and is now being shipped to the blast trial sites, Mining3 says.

Senior Research Leader, Dr Andrew Kettle, said: “Rurex certainly challenged Elquip during equipment testing. Sub-zero temperatures during the winter months, last year, proved the ambient temperature manufacture claims for the emulsion formula. Importantly, the emulsion, made from two liquids, one obviously being hydrogen peroxide-based oxidiser phase, can be made at ambient temperature. From an Australian perspective, that reality is below 2°C to above 40°C. So, we have tested manufacture in these ambient environmental temperatures at Rurex.”

The alternative explosives research to date has been supported by ACARP and collaborating companies, such as Elquip and Rurex. Going forward, Mining3 has launched an Expression of Interest (EOI) to companies to build a commercialisation roadmap and deliver the technology to the mining market.

“The interest in our EOI for Mining3 alternative explosives technology has been very successful,” Dr Kettle says. “We have built on the industry awareness of our research and are looking at viable pathways to market. We have had numerous discussions covering the broad application of the formula in open-cut, underground and civil applications, and ancillary product applications of the formula with a large variety of industry interests. We’ll continue to work with the myriad of companies to ensure a safe and effective transition for this technology.”

Mining3 makes emulsion breakthrough on alternative explosives project

Explosives and blasting, Mining consumables, Mining services, , , , , , ,

In November, Mining3 says it achieved a significant milestone with the successful detonation of a world first hydrogen peroxide-based emulsion explosive as part of its alternative explosives project.

Using proprietary formulations, a series of trial blasts confirmed its ability to detonate, and provided early steps into the characterisation of this improved product, Mining3 said. “The new formulation is a major achievement in superseding water-gel/hydrogel formulations and a crucial advancement in product stability and sleep-time,” the company said.

Mining3 and the School of Mechanical and Mining Engineering at the University of Queensland are testing alternative explosive formulations, which eliminate the nitrogen component and replace it with hydrogen peroxide as the main oxidising agent. By removing the nitrogen component of the explosive formulation, it eliminates any NOx fumes generated after blasting, the partners said.

Back in January, Mining3 reported that detonation performance tests, conducted in December 2018 using new materials in the formula – physical sensitisation materials based on glass and polystyrene materials – had delivered improved explosive performance, reliability and product stability.

In its latest report, Mining3 reported on its emulsion developments: “Gums and emulsifiers, are the binding agents in water-gel and emulsions, respectively. Importantly, gums have a low-level organic contamination which leads to hydrogen peroxide degradation and limited current water-gel technology for manufacture-and-immediate-detonation applications.

“With synthetically produced emulsifiers, the material can be inert-to-hydrogen peroxide, lengthening the product stability to a significant period and enabling broader applications in the mining industry.”

Considerable effort has been invested in the pursuit of compatible emulsifiers, Mining3 said, and, with recent successes in detonation trials, it has made the past year of research “worthwhile”.

It continued: “Not only do we have a formulation with advanced oxidiser/fuel intimacy but also considerable advances in stability. Manufacture techniques have also maintained the ambient temperature methodology that gives the hydrogen peroxide-based explosives technology a distinct advantage in production cost.”

Over five days at RUREX, Australia’s only professional independent detonation testing range, upwards of 60 detonation tests were fired. Several other formulations were tested that will advance in the technology pipeline, but it is the confirmation of emulsion tests that was the most immediate success, according to Mining3.

This research has been supported by ACARP from its inception and transfer of this technology to the industry is eagerly anticipated, Mining3 added.

Dr Andrew Kettle, Senior Experimental Scientist and Project Executor, said: “These blasts have confirmed that we are pursuing the right pathway forward. We have invigorated enthusiasm going forward to further characterise the new emulsions in preparation for mine site trials in 2020. We are indebted, of course, to the ongoing support of ACARP and RUREX, and the vision of Mining3.”