In the steel industry, the waste is built into the recipe. For every ton of steel produced, the process leaves behind 150 to 200 kilograms of slag, a stony by-product [Wikipedia, Unknown]. Most of it ends up in landfills, a permanent monument to industrial inefficiency. A company called White Black Slag Technology SRL, based in Treviso, Italy, has a patent that proposes a different ending. The question, eight years after that patent was filed, is whether the company itself is anything more than a document in a registry.
The Patent and the Pile
The company's sole verifiable asset is international patent WO2016116884A1, filed around 2016 [Google Patents, 2016]. It describes a method for recycling 'white slag,' a specific type of waste from steel deoxidation, whether it's solid, semi-solid, pasty, or liquid. The technical differentiation from prior art is in the treatment process, allowing for the regeneration of ladle furnace slags and providing controlled atmosphere cooling for electric arc furnace caps [WBST Italia, Unknown]. On paper, it's a cleantech wedge aimed at the heart of a dirty, massive-scale problem. Turning waste into a reusable material is the kind of unit economics that gets climate investors interested. The trouble is finding the units.
There is no public record of a pilot project, a first customer, or a ton of slag processed. The company's website lists its technology but shows no case studies or client logos [WBST Italia, Unknown]. Italian business registries show the company is active, with an authorized share capital of €20 million and €1.5 million paid in [WBST Italia, 2024]. This is a common structure for an Italian innovative startup, but it is not the same as venture funding. No funding rounds, lead investors, or valuations are disclosed. The founders are unnamed. The team is invisible. For all practical purposes, White Black Slag Technology is a patent and a postal code in Treviso.
The Incumbent Is the Landfill
The most credible competitor for any slag-recycling technology isn't another startup. It's the cost of doing nothing. Landfilling industrial waste is often the cheapest, simplest option for a steel mill, a fact cemented by decades of operational habit. For a new technology to break in, it must prove not just technical feasibility but a compelling financial argument: it must be cheaper than disposal, or it must create a new revenue stream from the recycled material that outweighs the capital and operational expense of installing new kit. White Black Slag Technology's patent addresses the 'how,' but the business case,the 'why now, and for how much',remains entirely unproven and unreported.
The risks here are straightforward, if severe.
- Technical validation. The patent is a blueprint, not proof of commercial-scale operation. Moving from a lab or pilot to a full mill installation is a capital-intensive leap with significant engineering risk.
- Commercial silence. The absence of any named customers, partners, or even industry acknowledgments after eight years suggests the technology has not yet found its first champion in the conservative steel sector.
- Team gap. Industrial hardware scaling requires deep metallurgical and heavy industry sales expertise. With no team visible, it's impossible to assess if that experience exists.
The math, however, hints at the scale of the opportunity, dormant or not. Global steel production is roughly 2 billion metric tons per year. Using the lower-end slag estimate, that generates about 300 million tons of waste annually. If a technology could capture even a single-digit percentage of that flow and turn a cost center into a marginal profit, the numbers become meaningful. The back-of-the-envelope calculation is simple: displace a landfill fee of, say, $30 per ton for just 1% of the global slag stream, and you're looking at nearly $100 million in saved costs. That's the prize. To win it, White Black Slag Technology must first beat the incumbent that has dominated the market for a century: the hole in the ground.
Sources
- [Google Patents, 2016] International Patent WO2016116884A1 | https://patents.google.com/patent/WO2016116884A1/es
- [WBST Italia, 2024] PROROGA DEI TERMINI DI AUMENTO AL 30/06/2025 | https://www.wbstitalia.it/news/proroga-dei-termini-di-aumento-al-30-06-2025/
- [WBST Italia, Unknown] White Black Slag Tecnology Regeneration of steel mill funds | https://www.wbstitalia.it/en/
- [Wikipedia, Unknown] Slag - Steelmaking slag | https://en.wikipedia.org/wiki/Slag#Steelmaking_slag
- [reportaziende.it, Unknown] White Black Slag Technology SRL company profile | https://www.reportaziende.it/white_black_slag_technology_srl_anche_e_piu_brevemente_wbstechnology_srl_o_wbst_sr_tv_04988140267