Phase I – Study regarding the possibilities of diminishing the energetic consumptions and of CO₂ emissions at clinker manufacturing (December 2007)

Performing of a study regarding the way of carrying out the clinkers of Portland cement with a low consumption of energy and CO₂ emissions;

Identification of some solutions of decreasing CO₂ emissions and energetic consumptions at clinker manufacturing, in the conditions specific to Romania.

• using the mineralizators, with a description  of mineralizators classes and the influence exercised  on clinker quality, and also caloric consumptions at clinker burning.  It was pointed out the fact that by using the fluorides, is possible a decreasing with 20-50 kJ/kg clinker of caloric consumption, through forming C₃S at a lower temperature, with benefic influences on clinker quality
• using some alternative raw materials of type:  blast furnace slags, fly ashes, concrete wastes from removals, wastes from paper industry.

• using some mineralizators from class of fluorides, oxides;

Objectives specific to this phase were the following:

Within phase no.1 the actual stage of manufacturing the clinker of Portland cement, in our country and abroad was presented. The performed study pointed out the possibilities of reducing   energetic consumptions and of CO₂ emissions at manufacturing the clinker of Portland cement, acting on the composition of raw mix as follow:

Sources of alternative raw materials, existing in Romania were identified and presented.
Following to performed study, the following directions of research were detached in order to decrease energetic consumptions and of CO₂ emissions at manufacturing the clinker of Portland cement, for the following phases:

using some alternative raw materials of type: non-granulated blast furnace slag, steel slags, fly ashes.