Process for the purification of a residue containing solids and mother liquor and having a chloride ion content greater than 5000 ppm by weight relative to the weight of the residue which comprises (a) piston washing said residue with a washing fluid and (b) recovering a purified residue.

A combustion gas bleeding probe includes a gas pipe for bleeding a part of a combustion gas from a kiln, and a plurality of discharge ports each of which is provided penetrating through the gas pipe and each of which discharges a low-temperature gas in a direction that is perpendicular to a direction of flow of a bleed gas bled by the gas pipe and that is directed toward a center of the flow of the bleed gas. The discharge ports discharge the low temperature gas such that a ratio of a momentum of the low-temperature gas per discharge port to a momentum of the bleed gas satisfies 1.2 to 4.0, and a value (m-1) obtained by dividing a ratio of a wind speed of the low-temperature gas to a wind speed of the bleed gas by an inner diameter of the gas pipe satisfies 1.5 to 3.5.

A method for controlling an NOx concentration in an exhaust gas in a combustion facility by: measuring a reaction velocity k.sub.i of each of a plurality of chars, each corresponding to a plurality of types of pulverized coals; determining a relationship between the NOx concentration in the exhaust gas and the reaction velocity k.sub.i for each of the chars; (iii) blending the plurality of the types of the pulverized coal, wherein a blending ratio of the plurality of the types of the pulverized coal is determined by using, as an index, a reaction velocity k.sub.blend of the char of the blended pulverized coal, which corresponds to a target NOx concentration or below, on the basis of the relationship; and supplying the blended pulverized coal to the combustion facility as the fuel of the combustion facility.

Systems and methods are provided for capturing CO.sub.2 from a combustion source using molten carbonate fuel cells (MCFCs). At least a portion of the anode exhaust can be recycled for use as part of anode input stream. This can allow for a reduction in the amount of fuel cell area required for separating CO.sub.2 from the combustion source exhaust and/or modifications in how the fuel cells can be operated.

Described are cementitious reagent materials produced from globally abundant inorganic feedstocks. Also described are methods for the manufacture of such cementitious reagent materials and forming the reagent materials as microspheroidal glassy particles. Also described are apparatuses, systems and methods for the thermochemical production of glassy cementitious reagents with spheroidal morphology. The apparatuses, systems and methods make use of an in-flight melting/quenching technology such that solid particles are flown in suspension, melted in suspension, and then quenched in suspension. The cementitious reagents can be used in concrete to substantially reduce the CO.sub.2 emission associated with cement production.

A method for treating limestone comprising raw meal in a cement clinker plant can be improved by first reacting the raw meal with a carboxylic acid (ROOH), thereby producing at least Ca(RCOO).sub.2, wherein the symbol R represents an organic group and subsequently converting the such obtained Ca(ROO).sub.2 into calcined raw meal by thermally decomposing the produced Ca(RCOO).sub.2 and/or Ca(RSO2O).sub.2 to thereby obtain at least CaO, CO.sub.2 and RCOH and/or RCOR.

CO.sub.2 is produced in a cement clinker line by (i) converting a CaCO.sub.3 comprising raw meal into calcined raw meal and at least CO.sub.2 and/or sintering calcined raw meal in a kiln, there-by obtaining at least cement clinker and optionally CO.sub.2. The CO2 emission of the cement clinker line can be significantly reduced by, dissolving at least a portion of the CO.sub.2 in a first carboxylic acid and/or a first sulfonic acid and reducing the dissolved CO2 electrolytically at a cathode of an electrolytic cell to a second carboxylic acid and/or a second sulfonic acid, wherein the first carboxylic acid and/or first sulfonic acid is used as a protonic aqueous electrolyte.

The invention relates to a method and a system for obtaining a recyclable product from waste minerals by heating the mineral waste in a combustor by combusting waste fuel in a closed loop combustion process and treating the mineral waste with high levels of oxygen and/or carbon dioxide. A mixture of waste minerals for recycling and waste fuel for combustion is supplied to a combustor, also concentrated oxygen and recycled flue gas comprising carbon dioxide is supplied to the combustor for heating the mineral waste in an atmosphere of increased oxygen and carbon dioxide level to obtain a recyclable product from the waste minerals.

Proposed is a system for capturing and recycling carbon dioxide and producing hydrogen for a cement manufacturing facility. The system includes a preheater provided with multiple stages of cyclones arranged in series in a vertical direction and configured to receive and preheat a cement raw material, a calciner configured to calcine the cement raw material preheated by the preheater, a kiln configured to burn the cement raw material calcined in the calciner, an exhaust line connected to the cyclones and configured to discharge an exhaust gas respectively discharged from the calciner and the kiln to the outside, a reactor configured to capture carbon dioxide in the exhaust gas, to collect a reactant containing the captured carbon dioxide, and to separate a carbon dioxide reactant and a waste solution in the reactant, and a hydrogen generator configured to generate hydrogen gas by receiving the separated carbon dioxide from the reactor.

A method of processing exhaust gas from a cement plant, the cement plant including one or several raw meal mills for milling a cement raw meal, one or several preheater strings, each having a plurality of preheater stages, and a rotary kiln, wherein the one or several preheater strings are for preheating the cement raw meal in counter-current flow with an exhaust gas from the rotary kiln. The method includes extracting the exhaust gas from a second highest or highest stage of at least one of the preheater string(s), cooling the exhaust gas to a temperature of <250 C., dedusting the exhaust gas, introducing the cooled and dedusted exhaust gas into a carbon capture installation, in which CO.sub.2 is separated from the exhaust gas for obtaining a CO.sub.2 lean gas, wherein the exhaust gas, when being introduced into the carbon capture installation, has a CO.sub.2-content of >25 vol.-%.