If your facility handles sulfuric acid, you already know what happens when containment fails. Corrosion spreads fast. A compromised tank means unplanned downtime, environmental risk, and the kind of regulatory scrutiny that follows you long after the leak is cleaned up.

These are the kinds of high-cost issues that we want to help plant managers, operators, and their engineering teams avoid.

At Protective Coatings (Proco), we’ve been solving this problem for American industrial operations since 1958. Our rubber-lined acid tanks are purpose-built for the chemical demands of mining and fertilizer production, and they consistently outperform standard carbon steel or fiberglass alternatives in the most aggressive service conditions.

Why Standard Tanks Fall Short

Even at moderate concentrations, sulfuric eats right through carbon steel, weakens welds, and eventually compromises structural integrity. For some operations, the result is a maintenance cycle that never really ends. You have frequent inspections, patch repairs, and early tank replacement cutting into your operational budget year after year.

For facilities running continuous processes, like heap leach operations or continuous fertilizer production, you need a more reliable solution. Every hour of unplanned downtime has a direct cost, and in high-throughput environments, those costs add up fast. The ROI equation quickly adds up in favor of a properly protected tank.

The Proco Solution: Rubber Lining That Lasts

Proco’s acid tanks are lined with vulcanized rubber, applied and cured to form a seamless, chemically resistant barrier between the acid and the tank substrate. The lining is engineered to handle both dilute sulfuric acid across a wide range of temperatures and pressures. Of course, for concentrated acid storage, the industry standard solution is baked-on epoxy coating.

Why do you need a rubber tank lining if you’re only dealing with dilute acid? Mainly, any concentration will start to eat through bare steel.

Then why not fiberglass tanks? What sets rubber lining apart there is the combination of chemical resistance and mechanical flexibility. Our rubber linings resist permeation, handle thermal cycling without cracking, and bond tightly to the tank surface to prevent underfilm corrosion: one of the most common failure modes in acid service tanks.

Proco works with customers during the specification phase to match lining compound and thickness to the exact service conditions of the application. This isn’t a one-size-fits-all product. It’s an engineered solution designed around your process.

Mining Leach Operations

In heap leaching, sulfuric acid is used to dissolve copper, uranium, and other metals from crushed ore. The acid is stored, distributed, and collected in large volumes, often in remote locations where maintenance resources are limited and tank failures carry serious environmental consequences.

Proco rubber-lined tanks give mining operators a containment solution they can rely on between scheduled maintenance intervals. The linings resist the dilute sulfuric acid concentrations typical of leach circuits, as well as the trace metals and abrasive particulates that often accompany the process stream. Longer service life between re-linings means fewer interruptions to your leach cycle and better recovery rates over time.

Fertilizer Production

Sulfuric acid is a foundational input in the production of phosphoric acid, ammonium sulfate, and other nitrogen and phosphate fertilizers. Production facilities run hard, with tight seasonal schedules and little tolerance for equipment downtime during peak demand periods.

Proco tanks support continuous-duty service in these environments. Whether you’re storing concentrated sulfuric acid as a feedstock or handling dilute acid streams in process vessels, our rubber-lined tanks are built to keep up with your production schedule. Facilities that have switched from standard steel tanks to Proco rubber-lined equipment consistently report fewer emergency repairs and longer intervals between planned maintenance.

Compliance and Environmental Protection

Environmental compliance is a growing pressure for both mining and fertilizer operations. Secondary containment requirements, spill prevention plans, and permit conditions all depend on having reliable primary containment in place. A tank that leaks puts your compliance status at risk, regardless of how well the rest of your program is managed.

Proco rubber-lined tanks help facilities stay ahead of these requirements. The lining system is designed to remain intact and inspectable over long service intervals, giving you documentation support and confidence during regulatory reviews.

In Summary:

Considerations	What to Keep in Mind
The Problem	Sulfuric acid rapidly corrodes standard tanks, causing leaks, downtime, and compliance risk
The Solution	Proco rubber-lined acid tanks create a seamless, chemically resistant barrier that stops corrosion at the source
Mining Applications	Ideal for heap leach circuits handling dilute sulfuric acid with abrasive particulates in remote, high-consequence environments
Fertilizer Applications	Supports continuous-duty service in phosphate and nitrogen fertilizer production with tight seasonal uptime demands
Environmental Compliance	Long-lasting, inspectable lining systems help facilities meet secondary containment and spill prevention requirements
ROI Advantage	Lower repair frequency, longer service life, and reduced downtime risk deliver better total cost of ownership over time
Why Proco	Custom-engineered lining specifications matched to your exact process conditions, not an off-the-shelf product

Better ROI Over the Life of the Tank

The economics of rubber-lined tanks become clear when you look beyond the initial purchase. Reduced repair frequency, longer service life, lower risk of unplanned downtime, and avoided environmental remediation costs all contribute to a total cost of ownership that typically beats alternatives by a significant margin.

Proco works with process engineers, plant managers, and purchasing teams to size and specify tanks correctly from the start, because the best investment is one that performs exactly as expected from day one.