| Nowadays, the industrial activities of aluminum, steel, and cement produce large quantities of alkalis residues. A part of these residues are used in other areas such as construction and hydrometallurgy, but millions of tons are stored in areas posing a risk to environment. These residues can be used by these industries to sequester the CO2. Several techniques of CO2 sequestration exist. The purpose of this master's thesis is to explore the possibilities of CO2 sequestration by alkalis residues from a wide spectrum of industrial activities.The results obtained during testing were 24 hours demonstrated that three residues alkali are separated by high potential for CO2 sequestration: (1) Slag BF: 65 kg CO2 / t slag (2) Slag PF: 59 kg CO2 / t slag (3) The cement 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 sequestration of CO2 by following performances: (1) Slag PF: 107 kg CO2 / t slag (2) Slag BF: 84 kg CO2 / t slag (3) The dust cements kiln dust (CKD): 79 kg of CO2 per tonne of CKD.Keywords: sequestration, CO2, red mud, steel slags, CKD, fly ashThe batch absorption of CO2 of 24 and 48 hours CO2 absorption batch tests were performed on samples of wet and dry red mud, electric arc furnace (EAF), Poche furnace (PF), blast furnace (BF) slags, cement kiln dust and fly ash. All tests are performed in environment operating conditions (temperature 20-22°C ambient, atmospheric pressure). Tests of pH and conductivity were performed on all samples to study their evolution in the two sets of tests. |
