The SRF-type furnace from Dowa Holdings Co Ltd - recycling copper and precious metals at scale

Reviewed: ad hoc news B2B & Pro desk. Edited and checked on 2026-06-28, 00:05. Details in the imprint.

The SRF-type furnace sits in a bright hall in Kosaka, muffled by thick insulation, while a slow conveyor brings in grey recycled feed that smells faintly of hot metal and dust. In a few hours, that anonymous scrap becomes copper, gold and silver again.

What the SRF furnace does

Dowa Holdings Co Ltd’s SRF-type furnace is part of its Kosaka Smelting & Refining plant, designed to treat complex secondary raw materials such as waste circuit boards and copper concentrates. It recovers copper, gold, silver and other metals in an integrated smelting flow.Dowa Kosaka smelting overview

The furnace operates as a shaft-type smelter using solid recovered fuel and other energy sources, allowing Dowa to process lower-grade, more heterogeneous materials than traditional primary copper operations.Dowa metals business presentation Feed flexibility is central to how the unit supports Dowa’s recycling-focused business model.

How it fits into Dowa’s flow

Material entering the SRF-type furnace is first blended and agglomerated so that particle size and composition stay within a controlled band. Through the viewing port, engineers like plant manager Hiroshi Sato watch the orange glow of the shaft to judge how the burden is descending and whether adjustments are needed.

Molten matte and slag tapped from the furnace move to downstream converters and refining circuits where the contained copper and precious metals are upgraded to saleable form. Dowa reports total copper smelting capacity at Kosaka of roughly 70,000 tonnes per year, underpinned by SRF and related units.Kosaka capacity data

Why recyclers care

For recycling customers in Japan and abroad, the SRF-type furnace offers a way to monetize material that would otherwise be landfilled or exported. A truck driver unloading shredded electronics at Kosaka sees the grey feed disappear into the bunker, knowing that the value of the copper and gold will be recovered rather than wasted.

Dowa positions the plant as a solution for corporate and municipal partners who face stricter environmental regulations and want traceable treatment of their waste streams. The SRF-type furnace supports this by accepting varied inputs while maintaining controlled emissions within Japanese regulatory limits.

The environmental angle

Compared with primary mining and smelting, Dowa highlights that its recycling flows can reduce CO? emissions and land use per tonne of metal produced. The SRF-type furnace plays into this by using solid recovered fuel and carefully managed oxygen injection, improving thermal efficiency relative to older designs.

There is still the constant rumble of fans and the sharp smell of flux when a charge is adjusted, reminding visitors that heavy industry is never truly quiet. But the unit’s ability to take waste and turn it into refined metal aligns with Dowa’s wider narrative of resource circulation and environmental services.

Constraints and challenges

The SRF-type furnace is not a free lunch for Dowa. Feedstock supply depends on volumes of end-of-life electronics and industrial scrap, which can fluctuate with economic cycles and export policies. When inbound volumes dip, utilization rates and margins feel it.

On the technical side, engineers like Sato must constantly tune the blend to avoid operational issues in the shaft. Highly variable chlorine or plastic content can affect refractory life and slag chemistry, requiring maintenance planning and close customer communication about feed quality.

Where Dowa uses the metals

Metals recovered from the SRF-type furnace feed Dowa’s downstream businesses, from copper products to precious metal alloys for electronics. That internal loop helps stabilize value capture, as Dowa sells not just raw metal but higher-margin materials into Japanese and Asian manufacturing supply chains.

The furnace’s role as a bridge between waste and advanced materials ties it to broader themes such as decarbonization and circular economy policy in Japan. Government frameworks on resource circulation and electronic waste, published by Japan’s Ministry of the Environment, give context to why Dowa invests in such equipment.

Stock and company context

All told, the SRF-type furnace is one of several specialized units that anchor Dowa’s metals and recycling segment alongside environmental and electronic materials businesses. The company’s diversification means that an operational innovation in Kosaka can ripple through multiple revenue streams, from smelting to waste management services.

Dowa Holdings Co Ltd shares (ISIN JP3449200009) are listed on the Tokyo Stock Exchange, where the share price reflects expectations for metals demand, recycling volumes and Japan’s broader industrial cycle.

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