Solar-Integrated Mineral Carbonation for Net-Zero Mining Operations

Why It Matters

This research demonstrates a pathway for heavy industries to significantly reduce their environmental footprint by leveraging renewable energy and waste valorization. It offers a tangible example of how circular economy principles can be applied to complex industrial processes, moving beyond incremental improvements to systemic transformation.

Key Finding

By combining solar thermal energy with mineral carbonation and direct air capture, a mining operation can eliminate its power-related CO2 emissions, sequester significant amounts of atmospheric carbon, and drastically cut fossil fuel use.

Key Findings

• The integrated system can achieve net-zero CO2 emissions for power-related emissions in the case-study mine.
• A net of 5.78 MJ heat per kg of carbonated product is required, with 10.7 MJ per kg of CO2 produced in DAC also provisioned.
• The process can permanently sequester 92.2 kt of atmospheric CO2 annually and reduce diesel consumption by almost 90%.
• The system can offset non-power related emissions, leading to a total CO2 avoidance of 68.55 kt annually.

Research Evidence

Aim: Can concentrated solar power, accelerated mineral carbonation, and direct air capture be integrated to create a net-zero CO2 emission process for mining operations, while simultaneously reducing waste and maintaining energy output?

Method: Simulation and Modelling

Procedure: A closed-loop Rankine cycle was simulated in Aspen Plus, integrating a concentrated solar power system with thermal energy storage, an accelerated mineral carbonation heat exchanger, and a direct air capture heat exchanger. The system was designed to generate 10 MWe of electricity for a hypothetical Australian nickel mine, with heat transfer optimized through the process stages.

Context: Industrial mining operations, renewable energy integration, carbon capture and utilization

Design Principle

Synergistic integration of renewable energy, waste valorization, and carbon capture technologies can achieve net-zero emissions in industrial processes.

How to Apply

When designing new industrial facilities or retrofitting existing ones, consider integrating renewable energy sources with carbon capture and utilization technologies, prioritizing processes that can utilize waste streams.

Limitations

The study is based on a hypothetical case study and simulation; real-world implementation may face site-specific challenges and require further detailed engineering and economic analysis. A full life cycle assessment relative to business-as-usual is still imperative.

Student Guide (IB Design Technology)

Simple Explanation: Imagine using the sun's heat to power a mine, capture carbon from the air, and turn mining waste into rock, all while making the mine's operations carbon-neutral.

Why This Matters: This research shows how complex environmental problems like industrial emissions and waste can be tackled with innovative, integrated design solutions, making it a great example for understanding system-level thinking in design.

Critical Thinking: To what extent can the principles of this integrated system be applied to other heavy industries beyond mining, and what are the primary challenges in scaling up such solutions?

IA-Ready Paragraph: The integration of concentrated solar power with accelerated mineral carbonation and direct air capture, as demonstrated by Milani et al. (2025), offers a compelling model for achieving net-zero emissions in industrial settings. This approach not only addresses power-related CO2 emissions but also leverages waste streams for carbon sequestration, significantly reducing the overall environmental footprint of operations.

Project Tips

• When proposing a design solution, consider its impact on multiple environmental metrics, not just one.
• Investigate how different technologies can be combined to create a more efficient and sustainable system.

How to Use in IA

• Use this study as an example of how to integrate multiple technologies for a sustainable outcome in your design project.
• Reference the simulation methodology to justify your own modelling approaches.

Examiner Tips

• Clearly articulate the synergistic benefits of combining different technologies in your design.
• Ensure your proposed solution addresses both energy generation and environmental impact.

Independent Variable: ["Integration of CSP, AMC, and DAC technologies","Solar thermal energy input"]

Dependent Variable: ["Net CO2 emissions","Electricity generation (MWe)","Diesel consumption reduction","Annual carbonate production (kt)","Atmospheric CO2 sequestered (kt)"]

Controlled Variables: ["Mine site characteristics (hypothetical Australian nickel mine)","Rankine cycle parameters","Turbine efficiency","Heat exchanger performance"]

Strengths

• Addresses multiple environmental challenges simultaneously (emissions, waste, resource use).
• Provides a quantitative assessment of the system's performance.
• Proposes a novel integration of existing and emerging technologies.

Critical Questions

• What are the long-term stability and environmental impacts of the mineralized carbon products?
• How does the intermittency of solar power affect the reliability of continuous mining operations, and how is this managed by the thermal storage?

Extended Essay Application

• Investigate the feasibility of adapting this integrated system for a different industrial sector, such as cement production or steel manufacturing, by adjusting the specific mineral carbonation and DAC processes.
• Conduct a comparative life cycle assessment of this integrated system against traditional mining operations to quantify the full environmental benefits.

Source

Mineralisation as a carbon sink for DAC: A case-study for solar thermal process integration · Cleaner Engineering and Technology · 2025 · 10.1016/j.clet.2025.100974