Method for backfilling of underground voids using mineralized co 2 and cementitious tailings

The integration of CO2 mineralization into cementitious backfilling processes addresses the need for both carbon sequestration and structural stability in underground mining, offering a sustainable and cost-effective solution for CO2 storage and backfill material enhancement.

WO2026125493A1PCT designated stage Publication Date: 2026-06-18BLUE SKIES MINERALS GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BLUE SKIES MINERALS GMBH
Filing Date
2025-12-10
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Existing backfilling methods for underground mining operations are costly and environmentally harmful due to high carbon emissions from Portland cement use, and there is a need for a method that combines carbon sequestration with structural backfilling to reduce atmospheric CO2 levels and enhance mechanical stability.

Method used

A process that incorporates captured CO2 into a cementitious paste by forming carbonates with alkaline solutions or gases, mixed with mine tailings and binders to create a stable backfill material.

Benefits of technology

The process achieves efficient CO2 sequestration, providing a structurally sound and environmentally sustainable backfill material with enhanced mechanical strength and durability, while being cost-effective and adaptable to different mine waste compositions.

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Abstract

The presently claimed invention is directed to a process for the production of a cementitious paste for backfilling of underground operations, wherein the process comprises at least the steps of (1) providing carbon dioxide in an alkaline solution to form a medium containing at least one carbonate or providing carbon dioxide in the form of a concentrated carbon dioxide gas, and (2) mixing (a) at least one binder, (b) mine tailings, (c) the medium containing at least one carbonate of step (1) or the concentrated carbon dioxide gas, and (d) optionally at least one filler to obtain a cementitious paste.
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