Ambient Carbon Dioxide Mineralisation for Carbon Sequestration

Carbon dioxide (CO₂) captured from flue gas emissions need to be safely sequestered to prevent re-emission into the atmosphere. One promising method to do so is mineral carbonation, which converts the captured CO₂ into solid carbonates that are inert and permanently stable. However, the process for mineral carbonation commonly involves high pressure, temperature and a pure CO₂ supply, or the use of chemical additives to activate the raw materials for reaction which severely limits its application.

This technology offer is an ambient condition mineral carbonation process which avoids the high energy requirements of traditional mineralisation processes. It is adaptable and versatile, able to use a mixture of various raw materials such as incineration ash, concrete waste and steel slag as feedstock. This technology can be coupled directly to an efficient CO₂ capture process, which eliminates the need to purify and recover the CO₂ prior to the carbonation reaction. The carbonated aggregates (e.g. sand) from this process can be used as material for construction or land reclamation. In addition, if incineration ash is used as a feedstock, the heavy metals in it can be immobilised using this technology.

The technology owner is looking for partners especially those in building & construction, waste management and high CO₂ emitting industries for further co-development and test bedding of the solution. The technology owner is also keen to license this technology as well.

This technology offer is an ambient process that can convert captured CO₂ into solid carbonates. The technical features & specifications are as follows:

• Cost and energy saving (Ambient CO₂ mineralisation process conditions)
• Flexible feedstock (mixture of incineration ash, concrete waste and steel slag possible)
• Can be paired with existing CO₂ capture process
• Fixing of heavy metal leaching behaviour (incineration ash feedstock)
• Useful and inert post process aggregates (e.g. sand)
• Green credits generation

This technology is applicable for those looking to convert or sequestrate CO₂. The potential applications are:

• CO₂ conversion/sequestration (e.g. incineration plants, steel plants etc.)
• Aggregates manufacturing (e.g. building and construction companies, concrete/cement producers etc.)

• Energy and cost savings
• Alternative waste disposal
• Useful and inert aggregate product (sand)
• Heavy metal fixing of incineration ash
• Green credits (CO2 sequestration)