Process of inertization (dampening) of steel making slag for economical reuse
OwnerJoao Pimentel, Marco Valerio de Almeida Melo e Silva +5inventors
InventorsJoao Pimentel, Marco Valerio de Almeida Melo e Silva, Nocv Silveira, Ronaldo Mendonca, Marcio Mendonca, Joao Ouindeler, Eudier Silva
Life of this patent
Estimating the term…
Abstract
The Economic reuse of steel slag through its inertization (aeration and hydration), makes possible the inertization of this slag, as well as its reuse on road paving, now that its volumetric expansion is reduced to levels that do not compromise the structure and quality of these pavements.
Claims8
1- ECONOMIC REUSE OF STEEL SLAG THROUGH INERTIZATION (AERATION AND HYDRATION) PROCESS, characterized by the reduction of volumetric expansion in steel slag, verified on in a laboratory by specific tests, seeking the slag's economical reuse in pavement base and sub-base, and asphaltic covering in road works.
2- ECONOMIC REUSE OF THE STEEL SLAG THROUGH INERTIZATION (AERATION AND HYDRATION) PROCESS, according to claim 1, characterized by an inertization yard, over which the steel slag will be laid and processed.
3- ECONOMIC REUSE OF THE STEEL SLAG THROUGH INERTIZATION (AERATION AND HYDRATION) PROCESS, according to claim 1, characterized by distribution of the steel slag over an inertization yard in a homogenous way.
4- ECONOMIC REUSE OF THE STEEL SLAG THROUGH INERTEATION (AERATION AND HYDRATION) PROCESS, according to claim 1, characterized by movement of the slag on an inertization yard using a leveling machine, a plough, a bulldozer or any other equipment capable of promoting the aeration of the slag through its mixture, which accelerates the carbonation of the free magnesium and calcium oxides existing in the slag.
5- ECONOMIC REUSE OF THE STEEL SLAG THROUGH INERTIZATION (AERATION AND HYDRATION) PROCESS, according to claim 1, characterized by initial representative sample analysis of a steel slag lot for verification of the volumetric expansion level of the steel slag.
6- ECONOMIC REUSE OF THE STEEL SLAG THROUGH INERTIZATION (AERATION AND HYDRATION) PROCESS, according to claim 1, characterized by hydration, through water aspersion over the slag with a water truck, or aspersers installed on the inertization yard, arranged in a way so that all the slag is reached, accelerating the hydration reactions of the oxides contained the slag, especially the free magnesium and calcium oxides, which are the main responsible for the volumetric expansion of the steel slag.
7- ECONOMIC REUSE OF THE STEEL SLAG THROUGH INERTIZATION (AERATION AND HYDRATION) PROCESS, according to claim 1, characterized by leaching and solubilisation of the steel slag, generating residues that will have other treatment.
8- A process for using steel slag for use in road paving, the process comprising:
- defining an inertization yard for preparation of the slag;
- placing slag within the inertization yard;
- aerating the slag to accelerate carbonation of free magnesium and calcium oxides within the slag;
- and
- hydrating the slag.