Phase IV – Characterization of raw materials and dosages of raw mixes in order to perform clinkers with low content of heat and CO2 emissions (30 November 2009)

Specific objectives for this phase were the following:

–       Sampling and physical-chemical characterization of some non-carbonated wastes (ungranulated blast furnace slags, steel slags, fly ash)

–       Calculations of the dosages for the raw material mixtures, in order to perform some clinkers of Portland cement with lower consumptions of energy and CO₂ emissions

–       Dissemination on large scale of the information received on period of project development.

Within the phase no. 4 were sampled and characterized from physical-chemical and mineralogical point of view blast furnace slags from Galaţi and Călan hall, steel slags from hall Galaţi, Hunedoara, Reşita and Tirgovişte halls and fly ashes from Mintia, Bacău, Govora and Suceava steam power plants.

Based on chemical analyses calculations of dosage for raw materials mixtures which comprises non-carbonated materials were performed. It was pointed out the fact that using of non-granulated blast furnace slags contributes most at decreasing CO₂ emissions and of energetic consumptions, on one hand because of total replacement of the clay/marl and limestone partially,  and on the other hand because of the fact that they already suffer a thermal process and already contain silicates of calcium and magnesium.

Also, the fly ash with loss on ignition of 9% could be used both as raw material for total replacement of usual silica-aluminous component (clay or marl), and at mixture combustion through its energetic value.

 

Works presented at conferences:

Jenica Paceagiu, Nicoleta Vlad, Alina Bădanoiu, Georgeta Voicu, Maria Ioan, A study on the influence of fluorides and oxides on Portland clinker and cement properties, Romanian International Conference on Chemistry and Chemical Engineering –RICCCE XVI, Sinaia, Romania, 9-12 September, 2009

Jenica Paceagiu, Ileana Mohanu, Reduce of CO₂ emissions in clinker manufacture, 2-nd Symposium of Chemistry and Environment, Bar, Montenegro, 16-19 September, 2009 (Book of abstract, p. 45).

ISI Articles:

Jenica Paceagiu, Florin Amzică, Nicoleta Vlad, Alice Pop, The effect of NaF and SnO₂ on the characteristics of Portland cement clinker and cement, Romanian Journal of Materials, 39(4), 2009, p.286-297, ISSN 1583-3186

Neculai Mihailescu, Vasilica Daescu, Elena Holban, Mariana Nicoleta Badea, Jenica Paceagiu, Energy conservation and CO₂ emissions reduction for clinker Portland cement manufacturing process, Environmental Engineering and Management Journal, vol. 8 (4), 2009, p. 947-952, ISSN 1582-9596.

Etapa IV – Caracterizarea materiilor prime si dozaje de amestecuri brute in vederea realizarii clincherelor cu consum scazut de caldura si emisii de CO₂ reduse (30 noiembrie 2009)

Obiectivele specifice acestei faze au fost următoarele:

– Prelevarea şi caracterizare fizico-chimica a unor deseuri non-carbonatate (zguri negranulate de furnal, zguri de otelarie, cenusa zburatoare);

– Calcule dozaje amestecuri brute de materii prime pentru realizarea unor clinchere de ciment portland cu consum de energie şi emisii de CO₂ mai reduse;

– Diseminarea pe scară largă a informaţiilor obţinute pe parcursul derulării proiectului.

In cadrul fazei nr. 4 au fost prelevate şi caracterizate din punct de vedere fizico-chimic şi mineralogic zguri de furnal din halda de la Galaţi si Călan, zguri de oţelărie din halda de la Galaţi, Hunedoara, Reşita şi Tirgovişte şi cenuşi zburătoare de la termocentralele Mintia, Bacău, Govora şi Suceava. Pe baza analizelor chimice s-au efectuat calcule de dozaj pentru amestecuri de materii prime care inglobeaza materiale necarbonatate. S-a evidenţiat faptul că utilizarea zgurilor de furnal negranulate contribuie cel mai mult la reducerea emisiilor de CO₂ si a consumului energetic, pe de o parte datorită inlocuirii totale a argilei/marnei si parţiale a calcarului, iar pe de altă parte datorită faptului că au suferit deja un proces termic şi conţin deja silicaţi de calciu si magneziu. De asemenea, cenuşa zburatoare cu pierdere la calcinare peste 9% ar putea fi utilizată atât ca materie primă pentru inlocuirea totală a componentei silico-aluminoase uzuale (argila sau marna), cat si la combustia amestecului prin valoarea sa energetica.

Lucrari prezentate la conferinte:

Jenica Paceagiu, Nicoleta Vlad, Alina Bădanoiu, Georgeta Voicu, Maria Ioan, A study on the influence of florides and oxides on portland clinker and cement properties, Romanian International Conference on Chemistry and Chemical Engineering – RICCCE XVI, Sinaia, Romania, 9 – 12 sept, 2009

Jenica Paceagiu, Ileana Mohanu, Reduce of CO₂ emissions in clinker manufacture, 2^ndSymposium of Chemistry and Environment, Bar, Montenegro, 16 – 19 septembrie, 2009 (Book of abstract, p. 45)

Articole ISI:

Jenica Paceagiu, Florin Amzică, Nicoleta Vlad, Alice Pop, The efect of NaF and SnO₂ on the characteristics of portland cement clinker and cement, Revista Române de Materiale, 39(4), 2009, p.286-297, ISSN 1583-3186

Neculai Mihailescu, Vasilica Daescu, Elena Holban, Mariana Nicoleta Badea, Jenica Paceagiu, Energy conservation and CO₂ emmissions reduction for clinker portland cement manufacturing process, Environmental Engineering and Management Journal, vol. 8 (4), 2009, p. 947-952, ISSN 1582-9596.