Zinc oxide concentrate production is performed in the so-called rolldown process with the use of rotary furnaces. It is a complex technological process in which the zinc-bearing waste harmful to the environment is used as raw material. Incorrect process execution will cause a large number of unplanned stops. Three upgraded technological lines used for the production of concentrated zinc oxide at B. Recycling Sp. z o.o. company were analyzed. The purpose of the study was to determine the production process efficiency after implementation of the changes. In the study we used the Total Productive Maintenance method. We made the histograms for planned downtime and failures of individual technological lines for a period of one year and set the MTTF, MTBF and OEE indices. Analysis of results has allowed to propose a solution to shorten the failure duration.