Abstract
The world’s rapidly growing demand for raw manganese has made it increasingly important to develop methods for the economic recovery of manganese from secondary sources. The current study aims to present possible ways for the recycling and reuse of silico-manganese slag landfilled in Tulcea, City on the Danube River close to the Danube Delta Biosphere Reserve in order to save the natural resources raw of manganese. In the last three decades, the ferroalloy production plant has over 2.6 million tons of slag. Slag dumping constitutes a significant source of air, water and soil pollution, which adversely affects the environment and human health. Mn present in the slag dump is an environmental pollutant with potentially toxic effects. The results obtained with a leaching method to recover manganese from slag shows two efficient ways to valorize manganese from solid fraction (54%) with size particles between 80 and 315 µm and/or reuse the leaching medium (56% Mn) with a slag size of <80 µm. The motivation of our research is the possibility to recover manganese from slag by saving natural resources of raw of manganese and the remaining fraction can be used as aggregate sources (construction and road rehabilitation by saving extract mineral aggregates and agriculture), in order to decommission the slag dump. The proposed research is in concordance with the sustainable use of natural resources for the achievement of sustainable development of the 2030 Agenda and Waste Management Legislation due of the huge ecological costs regarding non-conforming waste dumping. If we consider the cost-benefit analysis, the environmental future is more important the human health and the benefits on the quality of the population’s health and the environment which are not non-measurable in monetary value.
Highlights
One of the major problems today in the steel industry is the production of large amounts of waste
A lot of studies have been made on the utilization of blast furnace slag for the concrete and engineering applications
The motivation of our study is to confirm that exist the possibility to recover manganese from slag, and the remaining fraction is used as aggregate sources in order to decommission the slag dump
Summary
One of the major problems today in the steel industry is the production of large amounts of waste. Waste solids that emerge from steel plants are in the form of slags, sludges and dust. It is well known that the dust particles can cause cardiovascular and respiratory health problems [1,2,3]. In steel production the majority of slags generated are blast furnace slag and steel melting slag. Air-cooled slag and granulated slag are the types of the blast furnace slag generated from steel plants. The application scope for the air-cooled slag is as aggregate in road making processes, and blast furnace granulated slag is as additive in the production of cement [4]. Steel slag, discharged at a high temperature range, is a by-product of the steelmaking and steel refining processes
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