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Anglo Platinum Gains Production Intelligence

Scalable, flexible PlantPAx process automation system provides insight into real-time process data, improves recipe tracking

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Challenge

  • The aging process control system required a specific skill set, was unable to meet needs of complex processes, and was difficult to update due to multiple vendors

Solutions

  • Information-Enabled PlantPAx process automation system
  • Customised for refinery’s hybrid batch and continuous processes
  • Scalable, flexible process control system with visualisation, analysis and reporting capabilities, with insight into production trends
  • Compliant with ISA-88 standards

Results

  • Improved visibility: gained access to data across every level to track recipes in real time and make adjustments as needed
  • Reduced batch variability with insight into processes
  • Increased flexibility: single-vendor system eased implementation and customisation for unique requirements

Background

Platinum is the rarest of the world's metals. Annually, only about 133 tons of platinum are extracted from earth, compared to around 1,800 tons of gold. Rarity isn't the only reason platinum is prized in the world of fine jewelry. It's also resistant to fading and its malleability helps hold diamonds and other jewels in place.

Anglo Platinum in South Africa is the world's largest platinum producer. A subsidiary of Anglo American, the company processes nearly 40 percent of all newly mined platinum annually. The Anglo Platinum precious metal refinery (PMR) is located near two of the largest platinum mines in the world. The ore processed by the refinery contains more than just platinum. Other “precious group” metals (PGMs) include ruthenium, rhodium, palladium, osmium and iridium. The refinery also extracts base metals, such as nickel, copper and zinc.

Uses for the platinum produced here extend well beyond jewelry. The precious metal helps catalytic converters strip pollutants from car exhaust gases and is increasingly considered an alternative energy source, using platinum fuel cells to address environmental and energy concerns.

The refining process is complex because of the variety of metals extracted. Anglo Platinum found its process automation system increasingly difficult to support and too fragmented to handle the refinery's intricate process. So, the company began searching for a solution.

Challenge

Processing PGMs begins by removing ore from either an underground or open pit mine. Anglo Platinum then transfers the ore to one of its concentrated plants where the ore is crushed and floated. From there, it enters the smelting process, which removes unwanted elements from the ore. A converter then transfers the product to the company's magnetic concentrator plant, where base and precious group metals are separated.

Operations were complicated by the 1980s-era legacy control system, which had been compiled by various vendors. The result: a legacy system that required specialized skills to maintain. Such a cobbled system was also hard to upgrade any further.

“We have both batch and continuous processes occurring in our refinery, so variation was a key consideration when searching for a new solution,” said Hermanus du Preez, control technology specialist, Anglo Platinum. “Our system needs to be able to maintain continuous processes and monitor batches – in other words, it needs to cater to our complexity.”

The PMR faced issues with efficiently routing and sharing equipment used for multiple recipes. Operators needed to decide which equipment should be used when and by what process to cater to various recipes, but they were unable to schedule the sharing of equipment in advance, often causing delays.

To gain a scalable and flexible system, the company decided to move forward with a single vendor. “We needed to standardize, align with international best practices, and upgrade our system to prepare for the next 10 to 15 years of operation,” said du Preez.

Solution

The Anglo Platinum PMR already had a network infrastructure in place using a Rockwell Automation control system. So the company selected a PlantPAx® process automation system from Rockwell Automation to standardize its control systems with one vendor.

The PlantPAx system is a modern DCS designed to manage plant-wide automation systems. As a result, Anglo Platinum can use the same automation technology throughout the refinery – enabling seamless integration, easy access to information, and easy modifications as demand or products change.

“The PlantPAx solution was an ideal fit,” du Preez said. “We were able to put the full, robust system on top of our existing control base, which helped us create standard control modules needed for our processes.”

Customization was a critical element of the solution. Working closely together with Rockwell Automation, Anglo Platinum implemented a hybrid process system that caters to batch and continuous processes, and is compliant with ISA-88 standards.

For example, Anglo Platinum added a “routing block” to the refinery's operation that allows operators to effectively schedule and control equipment for equipment sharing. Operators are also able to re-prioritize changes in the queue if needed and can do so online – a new, time-saving option with the modern DCS system.

By embedding both the procedural and regulatory control inside, and with the flexibility the system allows to build customized add-on instructions, the PMR now has batch reporting capabilities. These capabilities are delivered using their custom-build batch report AOI.

This improves the operator's ability to better control the plant by displaying which KPIs — such as operation and critical phase times, throughput capacity and batch variability — have been met and where a batch is at each stage on an operator screen. Reports displaying recipe parameters — those met and those deviated from – provide operators with access to real-time data allowing for enhanced reliability for recipe execution.

FactoryTalk Historian software taps into information that has been automatically identified, gathered and stored to help operators analyze process-related data. Refinery operators now have visibility into the time it took to validate a sample or for a piece of equipment to become available.

“Our operators have gained valuable information to help them understand why a certain batch took 20 hours to produce when it was supposed to take 16 hours,” du Preez said. “This improved visibility enables us to identify constraints in the refinery's processes that we weren't always aware of before.”

Stricter control is another benefit of the new modern DCS system. Every start and stop during production is reported through the historian software so operators receive a more realistic picture of each process and batch.

For example, if a batch abnormally deviates from its recipe parameters, the process will go into a safe state. When corrected and re-started, the batch will pick up where it paused by referencing specific KPIs.

Previously, any disruptions in the process were dependent on human intervention and were not always reported. Even though it is automated, operators still have the flexibility to intervene if needed.

With the PlantPAx solution, Anglo Platinum managers can develop standard recipe templates and libraries. From a maintenance perspective, this makes it easier to identify areas within the operation that might be experiencing unnecessary trips, faults or other issues.

Results

Operators have access to reporting across every stage and level of the process so they're able to keep track of recipes in real time and have stricter control during production.

“We have a more realistic view of operations now,” du Preez said. “With additional information and increased visibility, our operators can better understand the process.”

The increase in visibility had decreased batch variability. Operators can quickly compare batches and KPIs, and identify if and when a batch is deviating. As they get used to the system and monitor consecutive batches, operators will know how long a certain batch should take and when there is an issue.

The ISA-88-structured PlantPAx solution has also improved maintenance and troubleshooting, which helps Anglo Platinum comply with strict international process control standards.

“What the PlantPAx modern DCS system is bringing to the table is flexibility and scalability,” du Preez said. “We will always have unique requirements that we need to cater to, and this system gives us the option to meet those and remain compliant.”

Published 01 June 2016

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