EESTech actively seeks to reduce industries impact on the environment through the application of technically advanced waste management processes and services that will set new benchmarks for environmental sustainability.

Whilst there is no single environmental remediation solution for the damage caused by mine and process waste facilities, Mother Nature has the ability to regenerate itself over time, EESTech’s objective is to provide waste management solutions that will aid this natural process.

EESTech’s approach to remediation is to implement environmentally sustainable processes that complement  natures natural remediation process. The first step in remediation is the application of EESTech’s reclamation process, whereby the source and in most cases, the cause of contamination can be removed or made inert.

Through the process of reclamation, any remaining resource within the waste is recovered, leaving nonhazardous materials that can be removed for use in the construction industry or infrastructure development.

Through the selected application of EESTech’s proprietary equipment and processes the remediation project site can begin its transformation back into a living greenfield environment.

EESTech is committed to environmental sustainability and the communities in which we operate and live. The long-term nature of our projects will allow EESTech to establish lasting relationships with our clients and communities by making a positive contribution wherever we work.

ThermaSand

ThermaSand originates from the smelting of chromite ore at 2800oC producing a residual waste that comprises a mix of silica, alumina, and magnesium fused together, then further processed by EESTech to produce a high-quality sand or foundry sand known as ThermaSand.

A single EESTech process line can produce over 600,000 tons of ThermaSand annually with the following features.

  • The EESTech production process incorporates the removal of nearly all (99+%) of any metal from the feedstock and utilizes proprietary binary compounds that encapsulates any remaining heavy metal materials within an acid resistant matrix to produce an environmentally stable and leach resistant sand. Independently classified as an Type4 Inert Material.
  • This encapsulation compound also provides for a stronger grain structure, producing up to 60% less fines and dust, and supports a longer reusable service life.
  • Originating from molten slag which eliminates free silica, the cause of silicosis, the sand is thermally stable up to 1700o ThermaSand is an ultra-clean fine sand, free of clay and organic materials with a consistent particle size and composition.
  • An ideal sand product for geopolymer, shot-crete, cement, mortar, plaster, concrete, brick and tile manufacture which is activated to promote improved cementitious adhesion and enhances compressive strength in its final form.
  • ThermaSand is a cost competitive – high value alternative to traditional sands.
  • ThermaSand is a superior, highly abrasive sand blasting grit suited to most abrasive blasting needs. ThermaSand is a perfect replacement for silica sand following the recent European banning of silica sand for sandblasting due to the health concerns of fine silica dust causing silicosis. EESTech’s ThermaSand provides an environmentally friendly alternative to silica sand and it has a longer service life.
  • Global demand for industrial silica sand is forecast to grow by 5.5 percent per year to 291 million metric tons in 2018, with a value of $12.5 billion.
  • The global demand for abrasive sands is expected to grow 6.3% annually to $44.8 billion by 2023.
  • EESTech’s foundry ThermaSand offers highly valued advantages and a replacement option to natural Olivine sand, a foundry sand that is in short supply around the world.
  • EESTech’s ThermaSand is the first real environmentally sustainable alternative to offset the need for controversial wetland sand mining.

The EESTech Difference:

EESTech delivers advanced waste material stabilization solutions that incorporate the use of proprietary binary compounds that react with waste to encapsulate hazardous heavy metal materials within an acid resistant matrix. This reaction produces a strong, low permeability, chemically stabilized substrate that can be used in the processing of organic and inorganic waste streams.

When mixed with waste materials, these binary compounds react with polyvalent metal ions to produce precipitates, which are less soluble across a broader pH range than metal hydroxides produced by other processes. These precipitates reduce the solubility and leach ability of heavy metals to produce a more chemically stable non-toxic material. The reduced mobility of hazardous solids through encapsulation, results in a fixed by-product of limited solubility with a decreased risk of leaching hazardous materials into the environment.

EESTech’s unique binary compound enhances the setting and hydration of any cementitious and pozzolanic matrix. When combined with commercially available setting agents, it improves the final compressive strength and reduces the permeability of the resulting matrix to render the final product resistant to acidic attack. Increasing the hydration and bonding formation of any cementitious or pozzolanic matrix decreases the total number and size of voids or channels that can form during curing to further promote the structural integrity of processed materials.

The permeability of processed material will decrease over time to further enhance acid resistance. The gel structures that achieve this function are generated through a combination of process formulations contributing to the structural compressive strengths of the final product. The resulting product is solid, less leachable and more resistant to corrosive or mechanical erosion and degradation.

The cumulative benefits of EESTech’s particle stabilization process have been validated by analysis of the reclaimed sand generated from EESTech’s remediation of ferrochrome (FeCr) slag waste. Independent analysis reports that EESTech’s waste stabilization process transforms the environmental liabilities of FeCr slag waste into commercially preferred high-grade sand.

All EESTech process formulations are nontoxic and ecologically harmless in freshwater environments, completely inorganic and both economically and environmentally sustainable.

EESTech Foundry ThermaSand:

EESTech’s foundry ThermaSand is technically an ideal feature rich alternative to Olivine foundry sand with no free-silica disposition and low thermal expansion resulting in the minimization or elimination of any defects in the setting of sand moulds.

ThermaSand Advantages:

  • Featuring an alkaline signature, which promotes better bonding and stronger moulds as compared to silica sand, which is acidic by nature.
  • The foundry ThermaSand is sub-angular in shape providing good permeability for CO2 gas activation.
  • ThermaSand has a stronger grain structure that produces up to 60% less fines and dust, allowing for longer service life and better CO2
  • The foundry ThermaSand has lower thermal conductivity, which reduces pouring temperature and yields a better metal part finish.
  • ThermaSand has a low bulk density of 3.0 making it considerably lighter than natural olivine sand, which enables more moulds per ton of sand to be produced.
  • ThermaSand has no loss on ignition nullifying the possibility of pitting defects or the generation of off-gas’s during metal casting which some natural Olivine produce.
  • EESTech can produce a wide range of grain sizes to meet foundry requirements.

thermasand

Independent test results reveal that mould permeability, compression and shear strength of sands from FeCr slag make it a suitable candidate for either partial or full replacement of moulding sand. During casting, no burning, dripping nor collapse of the mould walls was observed in moulds produced from sands originating from FeCr slag; this is true for both ferrous and non-ferrous castings. Castings with a good surface finish, no surface defects and without porosity were made by slag moulds. FeCr Slag sand moulds show faster solidification rates than traditional sand moulds. With faster heat transfer, FeCr slag sand moulds enable castings with enhanced metallurgical and mechanical properties including, hardness, compression and tensile with improved elongation.

More than 90 percent of all manufactured goods in the United States contain cast metal components, consuming over 100 million tons of foundry sand annually.

Click here to read ThermaSand Independent Report