Waste slag benefits for correction of soil acidity

Abstract

The global trend is to find new materials with improved environment friendly. The sustainable development of 2030 AGENDA and Waste Management Legislation sustain the disposal of a large quantity of slag at landfill sites by causing environmental consequences which has drawn attention to the need for its more effective recycling. Heavy industries have been operating in the Galati area for over 30 years and an ecological education is necessary for an efficient management of waste slag. The agricultural land resources are an issue world-wide and through this investigative study we showed that the mixture of blast furnace slag and waste slag dumped in landfill can help remediation of the soil acidity and increasing the crop yield. The chemical, structural and morphological properties of three investigated different slag samples are evaluated for recycling in agriculture. Results indicated that the obtained mixture of the slag waste dumped in landfill and of granulated metallurgical slag shows its usage in saving the affected lands. Therefore, by elemental analysis determined by X-ray fluorescence analytical equipment, the optimum weight ratio for the composition of soil-slag mixture were achieved. The obtained mixture presents a balance between soil pH = 5.2 corresponding to a medium acid soil and slag pH = 12.5 which corresponds as strongly basic character which is beneficial in amelioration process of acidic soils for the improving of soil characteristics.

Ladle Furnace Slag: Synthesis, Properties, and Applications

“…Ghizman et al. 124 used LF slag to increase soil acidity. A mixture of LF slag and granulated slag improves soil acidity, which helps in agricultural land usage.…”

“…Using LF slag in moderate amounts helped increase the growth rate of the plants without any changes in the morphophysiological factors [78,123]. Ghizman et al [124] used LF slag to increase soil acidity. A mixture of LF slag and granulated slag improves soil acidity, which helps in agricultural land usage.…”

The Treatment of Natural Calcium Materials Using the Supercritical Antisolvent Method for CO2 Capture Applications

“…A field very much explored, and where considerable work can still be carried out, is the valorization of natural resources and the reuse of waste materials. Waste materials, for instance, from heavy or construction industries, are a major environmental problem, presenting a threat to the environment [3][4][5][6]. However, as previously stated, industrial waste can be an interesting source of valuable compounds, such as manganese obtained from silico-manganese waste slag [7], magnesium from industrial effluents [8], or rare earth metals from secondary sources, such as coal ash, red mud, or phosphogypsum [9].…”

A New Composite Material with Environmental Implications for Sustainable Agriculture

“…Sewage sludge, also referred to as biosolids, consists of the by-products of wastewater treatment, which are a mixture of the water, organic, and inorganic materials eliminated from wastewater that is sourced from domestic sewage industries during physical, biological, and/or chemical treatments. Biosolids are Materials 2023, 16, 6440 2 of 11 nutrient-rich organic materials that result from the treatment of domestic wastewater in treatment plants [4]. Traditional methods for the disposal of sewage sludge are costly and cause environmental pollution.…”