| Popis: |
The narrowing between technological and sustainable development comes as one of the main challenges for the scientific environment and the modern company. In this scenario, waste recycling is considered an alternative for preservation of non-renewable natural resources and the environment, as a possibility of reducing energy consumption, carbon dioxide generated in the manufacture of traditional materials, and consequently, an economic advantage. The interrelationship between the steel segment and the civil segment show the opportunity of using the slag generated in the steelmaking by the cement industry. However, one of the challenges of using this co-product as cementitious input is the chloride ion contamination of unknown origin. This research aimed to propose a method to ensure the technical feasibility of using slag generated in steel refining, aiming to eliminate the chloride anion as impurity. Four samples collected from different points of the steelmaking process were studied, applying a wash with distilled water to the non-soluble solid residue, in order to extract the contaminating ion. It was evidenced that, after contact between solid residue and water, in the first wash, the performance presented an efficiency within the average range of 92 to 93%. Thus, after the practice of a simple method of chloride extraction with liquid fluid, the steel slag can be applied without restriction as an alternative material and input in cement production. Achieving the satisfactory result, a figurative prototype was built in order to enable the industrial scale to perform the same procedure performed in the laboratory. |
