Nyrstar is the world’s 2nd biggest zinc producer operating five zinc smelters across 3 continents using Outotec ﬂuidized bed roasting technology. The zinc roaster in Clarksville, Tennessee, USA started its operation in 1978.
The roaster is the starting point for metallurgical zinc production, a critical area for the operations. Over recent years, plant availability decreased, directly affecting the production of the site.
“Nyrstar Clarksville had been experiencing significant issues with the 65m2 roaster which led to the decision to replace internal refractory in 2018. Upon commencement of the project, inspections of the roaster revealed that its steel shell had been significantly compromised and required a new design and replacement,” said Robert Winton, General Manager of Nyrstar Clarksville in Tennessee, USA.
“I had dealt with Outotec shutdown services during my previous work experience on a furnace rebuild in 2006. Based on my previous experience I suggested that we contact Outotec to assist with the expanded shutdown scope,” added Mr. Winton.
In early 2019, Nyrstar awarded Outotec with a plant inspection for the roaster as well as with the planning and execution of the plant shutdown in summer 2019. Based on the inspection results, and the critical roaster steel shell condition, we advised the customer to replace the roaster furnace with a new nozzle grate up to the dome and to eliminate both the cleaning ports and the walkway around the upper vertical wall of the roaster, which was agreed as the final scope of work.