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AngloGold Modernizes with a New DCS

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Just as you can't tell the forest from the trees, sometimes you can't tell what's going on in a process application or plant because of all the clutter on your HMI displays.

This was the challenge faced by one of AngloGold Ashanti's gold mines in northern Brazil, which had outdated and often confusing graphic displays.

The displays used to supervise the activated carbon process at the Unidad de negócios Serra Grande gold mine (MSG) in Crixás, Goiás province, also lacked clear and useful production data, which reduced the effectiveness of its operators, according to André Carvalho Guerra de Almeida, head of engineering, Tagna. The Brazil-based system integrator had been recruited by AngloGold to update its HMI displays in a line with client/server standards already used at the mine.

The activated carbon application at MSG had a SCADA system with two standalone stations and screens that were very colorful causing confusion for users trying to identify what was happening in the process and decide how to respond.

According to Almeida, they could start and stop equipment, but there was little information about what was going on in the process or its interlocks and sequences. The operators often felt lost, and the maintenance people could make changes that weren't added to the supervisory system, causing a real mess.

Our process expertise in batch, process optimization, and safety system solutions and services can help you to accomplish your goals. Learn more here.

Seeing More Onscreen

The activated carbon process is part of the filtering and acid washing process MSG uses to extract gold from ore after crushing and grinding it. Overall, AngloGold is Brazil's biggest gold producer. The MSG mine represents about 10% of the company’s global production of 3.8 million ounces per year from 14 mines in 10 counties, and accounts for 10-15% of total gold production worldwide.

Based largely on Rockwell Automation technology, the original automation architecture of the activated carbon process included one L73 CPU, seven remote I/O panels, 1,115 I/O points, one motor control center (MCC) communicating with 63 motors via EtherNet/IP, one FactoryTalk® server with 10 process graphics, and one engineering station running ControlLogix® and FactoryTalk Studio software.

MSG adopted PlantPAx DCS because it allowed them to take advantage of the Rockwell Automation Library of Process Objects, which adheres to international standards and best practices that helped to speed up the modernization process.

According to Almeida, MSG migrated their standalone stations to the client/server architecture and implemented a redundant server. They also reprogrammed their old SLC-500 CPUs to the new DCS, making maintenance easier with a plant-wide standard.

Culture Shifts

To adopt simpler, more user-friendly HMIs with the DCS at the mine, Almeida reported that Tagna and AngloGold's team had to overcome some cultural resistance to redesigning the colorful but less-than-effective displays. Eventually, they settled on a design using cleaner, grayscale, ISA101-compliant screens, which focus more on the process, and highlight important operations information with limited, targeted use of vivid colors.

They implemented a better HMI system that kept the same investments already spent on supervisory licenses and software. Almeida explained that the new screens show everything, and give operators step-by-step updates on the activated carbon process. They also make it easier to add changes using sequence blocks. "We knew we were on the right track when the operators took to the new screens so quickly. They kept asking when the old system would be retired," said Almeida.

The new activated carbon application was commissioned and operation began in three months. Its process was fully automated with sequence blocks, and it now delivers complete data about the process and assets to both the operations and maintenance teams.

Subsequently, MSG has also been adding PlantPAx DCS to its crushing and grinding plants. Crushing took about one 16-hour day of planned downtime to switch over, while the slightly more complex grinding area took about three days because it had more CPUs and I/Os.


Jim Montague
Jim Montague
Executive Editor, Control
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