Abstract: Method and installation for calcining cement raw meal in a calciner whereby fuel and a calciner oxidant having an oxygen content of at least 30% vol are introduced into the calciner so as to generate either an oxidant-lean zone or a fuel-lean zone in the calciner located between the lowermost fuel inlet level and the lowermost oxidant inlet level of the calciner, between 50% and 100% by weight of the raw meal being supplied to the calciner upstream of and/or within the oxidant-lean, respectively the fuel-lean zone.

Abstract: Method and installation for calcining cement raw meal in a calciner whereby fuel and a calciner oxidant having an oxygen content of at least 30% vol are introduced into the calciner so as to generate either an oxidant-lean zone or a fuel-lean zone in the calciner located between the lowermost fuel inlet level and the lowermost oxidant inlet level of the calciner, between 50% and 100% by weight of the raw meal being supplied to the calciner upstream of and/or within the oxidant-lean, respectively the fuel-lean zone.

Abstract: Method and installation for calcining cement raw meal in a calciner whereby fuel and a calciner oxidant having an oxygen content of at least 30% vol are introduced into the calciner so as to generate either an oxidant-lean zone or a fuel-lean zone in the calciner located between the lowermost fuel inlet level and the lowermost oxidant inlet level of the calciner, between 50% and 100% by weight of the raw meal being supplied to the calciner upstream of and/or within the oxidant-lean, respectively the fuel-lean zone.

Abstract: A process for producing a syngas containing CO and H2 from a stream of light hydrocarbons and from combustion flue gases from a cement clinker production unit comprising at least one calcining kiln (300), and a means for discharging the combustion flue gases (500) from the calcining kiln to the outside of said unit, said process comprising the following steps: at least some of the combustion flue gases (70) obtained in said clinker production unit are collected upstream of said means for discharging the combustion flue gases (500); a reaction stream (113) comprising a stream of light hydrocarbons (110) containing methane and the combustion flue gases (70) is prepared; said reaction stream (113) is sent to a tri-reforming reactor (1009) to obtain a syngas (114).

Abstract: Method and installation for calcining cement raw meal in a calciner whereby fuel and a calciner oxidant having an oxygen content of at least 30% vol are introduced into the calciner so as to generate either an oxidant-lean zone or a fuel-lean zone in the calciner located between the lowermost fuel inlet level and the lowermost oxidant inlet level of the calciner, between 50% and 100% by weight of the raw meal being supplied to the calciner upstream of and/or within the oxidant-lean, respectively the fuel-lean zone.

Abstract: A process for decarbonation of particles of raw meal, to be burnt in a clinkering kiln at a cement plant, the process includes: a) decarbonation of particles of raw meal, in a fluidized bed heat exchanger, the particles being suspended in a rising carrier gas including carbon dioxide, the fluidized bed heat exchanger having a solid heat carrier circulating counter-current relative to the carrier gas, to provide an effluent gas including carbon dioxide and decarbonated raw meal; b) separating the effluent gas and the decarbonated raw meal c) separating the effluent gas into a first and second part; cooling the first part of the effluent gas and recycling to provide carrier gas, d) isolating the second part of effluent gas e) recovering and re-heating the heat carrier and recirculating to step (a).

Abstract: A process and an installation for production of clinker and electricity, and a process for modifying a production installation of clinker are presented.

Abstract: A process and an installation for production of clinker and electricity, and a process for modifying a production installation of clinker are presented.

Abstract: A process for decarbonation of particles of raw meal, to be burnt in a clinkering kiln at a cement plant, the process includes: a) decarbonation of particles of raw meal, in a fluidised bed heat exchanger, the particles being suspended in a rising carrier gas including carbon dioxide, the fluidised bed heat exchanger having a solid heat carrier circulating counter-current relative to the carrier gas, to provide an effluent gas including carbon dioxide and decarbonated raw meal; b) separating the effluent gas and the decarbonated raw meal c) separating the effluent gas into a first and second part; cooling the first part of the effluent gas and recycling to provide carrier gas, d) isolating the second part of effluent gas e) recovering and re-heating the heat carrier and recirculating to step (a).

Abstract: A process for reducing the carbon dioxide concentration of a carbon dioxide-containing gas which process includes, in a first stage, contacting the carbon dioxide-containing gas with a treating solution including an alkali metal carbonate and/or hydroxide and with a catalyst to promote the absorption of carbon dioxide to form a second solution including an alkali metal carbonate and bicarbonate and, in a second stage, contacting the second solution with a carbonatable silicate-containing material including an alkaline earth cation capable of forming an insoluble carbonate to produce silica and a solid carbonate including the cation and to regenerate a solution including alkali metal carbonate.

Abstract: A process for reducing the concentration of carbon dioxide in a gas including carbon dioxide and water vapour (for example a flue gas or a cement plant flue gas) which process includes contacting the gas with a particulate solid, which solid includes an alkaline earth metal oxide or hydroxide and a promoter selected from an alkanolamine; an unsubstituted or substituted piperazine; an unsubstituted or substituted morpholine; and a polyethyleneamine oligomer.

Abstract: A process for reducing the carbon dioxide concentration of a carbon dioxide-containing gas which process includes, in a first stage, contacting the carbon dioxide-containing gas with a treating solution including an alkali metal carbonate and/or hydroxide and with a catalyst to promote the absorption of carbon dioxide to form a second solution including an alkali metal carbonate and bicarbonate and, in a second stage, contacting the second solution with a carbonatable silicate-containing material including an alkaline earth cation capable of forming an insoluble carbonate to produce silica and a solid carbonate including the cation and to regenerate a solution including alkali metal carbonate.

Abstract: The invention relates to a hydraulic mineral composition which is characterized in that it comprises a vitreous or crystallised matrix based on magnesium and calcium silico-aluminates which represent at least 25 wt.-%, and preferably 30 wt.-%, of the composition, one or more mineral oxides and optionally one or more specific mineral halides which are selected from among the oxides and halides of Ti, V, Cr, Mn, Co, Ni, Cu, Pb, Ba, Sr, P, S, Na, K, Zr, Mo, Be, Tl, As, Sn and Cd and which represent at least 5 wt.-% of the composition, at most 31 wt.-% alumina (Al2O3), less than 10 wt.-% ferrite, and less than 0.05 wt.-%, and preferably less than 0.01 wt.-%, C in relation to the weight of the composition.

Abstract: A low cost steel desulphurating agent includes, compared with the total weight of the agent, at least 10% of SiO2, at least 10% of C2S, and at least 35% of at least one of calcium aluminate or calcium silico-aluminate. The desulphurating agent can include, compared with the total weight of the agent, the following mineralogical phases: 10 to 60% of C2S, 0 to 50% of C3A, 0 to 50% of C2AS, 0to 70% of C12A7, and 0 to 60% of CA.

Abstract: The invention relates to a steel desulphurating agent characterised in that it comprises compared with the total weight of the agent: at least 10% of SiO2, at least 10% of C2S, at least 35% of at least one calcium aluminate and optionally a calcium silico-aluminate.

Abstract: The invention relates to a hydraulic mineral composition which is characterised in that it comprises a vitreous or crystallised matrix based on magnesium and calcium silico-aluminates which represent at least 25 wt.-%, and preferably 30 wt.-%, of the composition, one or more mineral oxides and optionally one or more specific mineral halides which are selected from among the oxides and halides of Ti, V, Cr, Mn, Co, Ni, Cu, Pb, Ba, Sr, P, S, Na, K, Zr, Mo, Be, Tl, As, Sn and Cd and which represent at least 5 wt.-% of the composition, at most 31 wt.-% alumina (Al2O3), less than 10 wt.-% ferrite, and less than 0.05 wt.-%, and preferably less than 0.01 wt.-%, C in relation to the weight of the composition.