EP 3 255 021 A1

Process for producing a cement clinker at low temperature

(22) 08.06.2016

(43) 13.12.2017

(57) The invention provides a process for producing a cement clinker comprising: (i) mixing one or more starting materials providing each at least one or more of CaO, SiO2, Al2O3, and Fe2O3; and, optionally, SO3, to form a raw meal comprising CaO, SiO2, Al2O3 , and Fe2O3; and, optionally, SO3, wherein the molar ratios among the aforementioned oxides is given by Formula I: (CaO)1(SiO2)a(Al2O3)b(Fe2O3)c(SO3)d, wherein: „a“ is comprised from 0.05 to 1, „b“ is comprised from 0.1 to 0.6, „c“ is comprised from 0.001 to 0.25, and „d“ is comprised from 0 to 0.3; (ii) heating the raw meal by irradiating with microwaves during 15 min to 3 h to reach a sintering temperature comprised from 300 to 950 °C; (iii) maintaining the microwave sintering temperature of step (ii) during 1 min to 3 h by further irradiating with microwaves; and (iv) cooling the clinker obtained in step (iii).

(71) Fundación Tecnalia Research & Innovation, 48160 Derio - Bizkaia (ES)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES Fl FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR; Designated Extension States: BA ME; Designated Validation States: MA MD

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