Évaluation du potentiel de la séquestration minérale du CO[indice 2] par des résidus et sous-produits industriels à pouvoir alcalin

Abstract

Nowadays, the industrial activities ofaluminum, steel, and cément produce large quantifies of alkalis residues. A part of thèse residues are used in other areas such as construction and hydrometallurgy, but millions of tons are stored in areas posing a risk to environment. Thèse residues can be used by thèse industries to sequester the CO2. Several techniques of CO2 séquestration exist. The purpose of this master's thesis is to explore the possibilities of CO2 séquestration by alkalis residues from a wide spectrum of industrial activities. The batch absorption of CO2 of 24 and 48 hours CO2 absorption batch tests were performed on samples of wet and dry red niud, electric arc fumace (EAF), Poche fumace (PF), blast fumace (BF) slags, cernent kiln dust and fly ash. Ail tests are performed in environment operating conditions (température 20-22°C ambient, atmospheric pressure). Tests of pH and conductivity were performed on ail samples to study their évolution in the two sets of tests. The results obtained during testing were 24 hours demonstrated that three residues alkali are separated by high potential for CO2 séquestration: • Slag BF: 65 kg CO2 /1 slag; • Slag PF: 59 kg CO2 /1 slag; • The cément kiln dust (CKD): 47 kg of CO2 per tonne of CKD. However, the results obtained during testing of 48 hours showed that the same alkalis residues allow a greater séquestration of CO2 by following performances: • Slag PF: 107 kg C 0 2 / t slag; • S l a g B F : 8 4 k g C 0 2 / t s l a g ; • The dust céments kiln dust (CKD): 79 kg of CO2 per tonne of CKD.

Date	3 May 2010
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Robert Hausler (Supervisor)