Nickel Producer enhances quality of ore calcination through kilns
Société Le Nickel (SLN), part of the Eramet Group, is the world’s largest producer of ferronickel. Pictured is one of the five furnaces managed by Rockwell Automation’s FactoryTalk Analytics Pavilion® software. Image copyright: Société Le Nickel (SLN), part of the Eramet Group. Characterised by the ability to resist corrosion at high temperatures and its usefulness as an alloying element, nickel plays a critical role in a host of industry sectors ranging from aerospace and chemical to electrical and automotive. Société Le Nickel (SLN), part of the Eramet Group, is the world’s largest producer of ferronickel. The 140-year-old company also produces manganese, lithium, and titanium which are critical for the manufacturing of batteries, paint pigments, and wind turbines among other products. Processing ores is a complex activity requiring the stable control of the rotary furnaces’ temperature profile and automating operations across different operating ranges. Feed ore introduced into the rotary kiln undergoes calcination as it travels through the length of the furnace. If the calcined product is not at a high enough temperature, product quality is compromised. Heat is distributed across the furnace with air being supplied for combustion to occur. If there’s too much air supplied, more fuel needs to be burned to maintain the same product temperature, thus decreasing energy efficiency. Excess oxygen must be minimised to a safe level to reduce operating costs and greenhouse gases. Legacy system lags SLN was using an expert system, an existing fuzzy logic controller, designed to automate the operation of the furnace. However, the company faced several challenges with the legacy system, particularly with varying ore content and variable heating values leading to temperature spikes and frequent electrical trips. Trips were being caused by high product temperature, which compromises both the quality of the product, and the integrity of the […]