CO2 storage with indirect carbonation using industrial waste

Abstract

In this work we studied the Indirect Carbonation of concrete waste and steel slag in order to find the best conditions of each of then aims the CO2 storage and find a useful destination of the waste. A complete study was developed with steel slag and the best results were adopted to concrete waste owing the expansion of construction industry in Brazil. The lixiviation with HCl acid, time, rate Liquid/Solid, temperature and concentration of acid was deep studied with a goal to use milder conditions avoiding energy penalty in the industrial process. Therefore a Calcium Carbonate was obtained and the feedstock could be re-used in the industries. The experiments were performed in a glass reactor at atmospheric pressure. The solutions and solid phases were characterized by Flame Atomic Absorption Spectroscopy (FAAS), Scanning Electron Microscopy (SEM) and Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES).