Influence of Different Carbon Content on Reduction of Zinc Oxide via Metal Bath

Abstract

Electric arc furnace dust (EAFD) is an important secondary resource for the zinc industry. The most common process for its recycling is the pyro-metallurgical treatment in the Waelz process. However, this process focuses on the recycling of the zinc, whereas the recovery of other metals from the EAFD—such as iron and other alloying elements—is neglected. An up-to-date version of reprocessing can involve multi-metal recycling by means of a metal bath containing carbon. The use of a liquid iron alloy requires a higher processing temperature, which enables the reduction and melting of iron oxides as well as other compounds occurring in the dust. Furthermore, the Zn yield is higher and the reduction kinetics are faster than in the Waelz process. This paper is only focused on the zinc reduction in such a metal bath. In order to determine the influence of the carbon content in the molten metal on the reduction rate, experiments were carried out on the reduction behavior of zinc oxide using a synthetic slag. This slag, with a basicity B2 = 1, was applied to an iron bath with varying carbon contents. (0.85%, 2.16%, 2.89%, and 4.15%) The decrease in the zinc oxide concentration was monitored, along with the reaction rates calculated from these data. It was found that the reaction rate increases with rising carbon content in the melt.

Evaluation of a Gluten-Based Edible Film Incorporated with Beetroot Extract and ZnO Nanoparticles as an Active Food Packaging System

“…The antioxidant activity of the GBEF matrix increases on increasing the BE amount; however, an increase in the amount of ZnONPs can reduce the activity of the antioxidant since the presence of ZnONPs can lead to a decreased pH of the GBEF matrix. The chemical reaction of ZnO with carbon produces the compounds zinc metal and carbon monoxide, causing a decreased antioxidant activity of the GBEF matrix, 48 as shown by the color change of the GBEF matrix from red-orange to yellow. The application of ZnONPs in the GBEF matrix, listed as a kind of safe substance by FDA, has been reported to have anticancer and antibacterial properties.…”

The Effect of Electric Arc Furnace Dust (EAFD) on Improving Characteristics of Conventional Concrete

“…Depending on the particular conditions affecting each EAF process, such as feedstock composition, furnace temperature, production duration, and the type of furnace employed, EAFD composition may change on a daily basis [8,22]. EADF substances are categorized as hazardous waste, so they may be treated [9,13,22,[27][28][29][30]. After being treated with encapsulation, approximately 70% of the EAFD generated worldwide is headed for landfilling, with the other 30% being used for metal recovery [15,16,31,32].…”