Natural gas – the cleanest, greenest ironmaking fuel. Midrex NG is the most widely-used technology for the production of all forms of direct reduced iron (DRI) products because they are known for their reliability and hours of continuous operation. Each year, MIDREX® Plants produce more than 60% of the entire world’s DRI and more than 80% of the DRI produced by all shaft furnace technologies.

Natural gas is playing a major factor in helping many industries cut emissions and improve the world’s overall air quality. To use natural gas for ironmaking, the natural gas needs to be processed, or rather, reformed into a usable reducing gas that is high in hydrogen (H₂) and carbon monoxide (CO) content.

MIDREX NG™, through use of the patented MIDREX® Reformer, cost effectively makes reducing gas for the iron ore reduction reactions that take place in the MIDREX® Shaft Furnace. The MIDREX® Reformer externally generates reducing gas and further optimizes the MIDREX Shaft Furnace performance by converting recycled gas (from the iron reduction reactions) along with fresh natural gas into H₂ and CO to produce additional reducing gas.

The MIDREX Reformer has been at the core of the MIDREX Process since its inception.

  • Reformer reforms both CO₂ and H₂O with natural gas, thus eliminating the need for an expensive CO₂ removal system
  • Generates low H₂ / CO ratio reducing gas- resulting in better energy efficiency
  • Valuable heat is retained from the MIDREX® Reformer eliminating the requirement of an expensive gas heater

reformer

The MIDREX Plant is extremely flexible and can accommodate the initial transitions from a carbon to a hydrogen economy.

While the natural gas-based MIDREX Process, paired with an EAF has the lowest CO2 emission of any steelmaking route using iron ore, there is room to further decrease emissions by using hydrogen as a fuel and chemical reactant in the process.

Midrex offers technologies that bridge the transition from 100% natural gas to 100% hydrogen direct reduction:

MIDREX NG, for the immediate and mid-term future allowing up to 30% natural gas replacement with hydrogen without equipment modifications and

MIDREX Flex, which provides a plant the flexibility to operate on any mixture of natural gas and hydrogen (up to 100% hydrogen) with some low-risk modifications.

For additional details please visit MIDREX NG™ with H2 Addition: Moving from natural gas to hydrogen in decarbonizing ironmaking – Midrex Technologies, Inc.

For greenfield plants designed specifically for 100% hydrogen operation or for majority hydrogen operation, see MIDREX H2 technology.

Each year, MIDREX® Plants produce more than 60% of the entire world’s DRI and more than 80% of the DRI produced by all shaft furnace technologies.

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