Abstract: An apparatus for roasting and cooling loose products includes an oven with a housing including an upper and a lower section with glass doors. The apparatus has an air and a gas distribution grid connected to the upper and lower sections. In addition, the apparatus includes a high-pressure ventilator in the upper section having an outlet connected to the air duct, a rotor drum installed over the gas distribution grid, a feeding tray located in the upper section, a heater located in the lower section and configured to heat air and a hopper located on top of the housing above the rotor drum and configured to feed the loose products into the oven. The hopper includes one or more strain gauges configured to weigh the loose products. An opening located adjacent the hopper intakes fresh air intake and outtakes humidified air and a horizontal cooler chills the loose products.

Abstract: The invention relates to a process for the production of binders by calcinating mineral raw material mixtures. In order to improve the process and the quality of the binders, it is proposed that oil shale and/or oil sand fills are converted by targeted agglomeration into particles of a certain size and consistency, wherein the water content for the mechanical stabilization of the agglomerate is adjusted to less than 25 percent and the agglomerates are calcinated to form binders at temperatures between 800 and 1500° C. under reductive conditions over the entire process with a Lambda value <1 in a vertical shaft furnace with updraft gasification. The binding properties are adjusted by the targeted addition of CaO-containing substances and/or existing sulfur fractions of the oil sands and/or oil shales are bound by means of the CaO that is present in the starting material and/or added.

Abstract: The invention relates to a method for manufacturing a sulfoaluminous or belitic sulfoaluminous clinker from a raw mix formed from a mixture including minerals containing calcium, aluminum, silica, iron, and sulfur, preferably in sulfate form, and is characterized in that the method comprises the steps including: at least partially dehydrating and decarbonating the mixture through placement in a vertical kiln (1) comprising a substantially vertical chamber (2) wherein the mixture is heated, the chamber (2) of the vertical kiln (1) being supplied with hot gases the temperature of which is between 900 and 1150° C.

Abstract: A lime pellet for use in asphalt applications is prepared to include lime fines and an asphalt-compatible binder. The pellet is characterized as having a rigid structure with a dimension greater than about 1.5 mm and being compatible with a hot mix asphalt so as to dissolve in liquid asphalt. The pellet is manufactured by mixing the lime fines with the asphalt-compatible binder and forming pellets therefrom. A benefit of the present method is the elimination of steps that cost time and money because limestone can be converted to quicklime, the quicklime is hydrated, and the pellet is formed in a continuous process or in a single system. The pellets are useful for conditioning an end product of hot mix asphalt during the manufacture of such an asphalt.

Abstract: A flow enhanced calcium sulfate product includes a calcium sulfate source material, such as a flue gas desulphurization by-product, is pre-blended with a granular feedstock exhibiting good cementitious properties. The flow enhanced calcium sulfate is fed to a cement mill where it is combined with clinker during a finishing grinding process for portland cement. The flow enhanced calcium sulfate exhibits good flowability without changing the properties of the cement.

Abstract: A method of making cement clinker in a wet rotary kiln that includes providing raw material at the front of the kiln and adding a second group of materials for processing at an intermediate location along the kiln. This second group may include materials that improve the clinker and requires less energy to produce. A kiln system that employs this method and a cement clinker made by the method.

Abstract: The present invention provides a dispersion, which contains nano-sized zinc oxide particles, a coating preparation containing the dispersion, a process for the production of the dispersion, and a coating preparation containing the dispersion, and a use of the coating preparation.

Abstract: Pyrogenically prepared zinc oxide powder having a BET surface area of from 10 to 200 m2/g, which is in the form of aggregates, the aggregates being composed of particles having different morphologies, and 0-10% of the aggregates being in a circular form, 30-50% being in an ellipsoidal form, 30-50% being in a linear form and 20-30% being in a branched form. It is prepared by reacting a starting mixture containing zinc vapour, a combustible gas and steam or a mixture of steam and carbon dioxide in a flame with an oxygen-containing gas in an oxidation zone, cooling the hot reaction mixture in a quenching zone and separating the solid material from the gas stream, the amount of oxygen in the oxidation zone being greater than the amount necessary for the complete oxidation of the combustible gas and the zinc vapour. The zinc oxide powder can be used as a constituent of sun protection compositions for protection against UV radiation.

Abstract: In order to provide a comparatively simple and cost-effective method for cement clinker production lines where especially raw materials and/or fuel/secondary fuel containing chlorine compounds and a partial gas extraction with an electrostatic dust collector as waste gas dust remover are used, with which the risk of emitting the waste gas pollutants dioxin and/or furan is eliminated, it is proposed in accordance with the invention that the extracted quantity of the partial gas extraction stream, after cooling and electrostatic dust removal, is held lower than the sum of the secondary air drawn through the rotary kiln and the tertiary air drawn past the rotary kiln, and to recirculate the cooled and dedusted partial gas extraction solely into an area of the clinker cooler in which the recuperation air is removed from the clinker cooler, and the dioxins and/or furans of the partial gas extraction are decomposed in the clinker cooler on the hot cement clinker and/or deposited and/or decomposed by the high temper

Abstract: Method for preparing a concrete mortar which contains a fraction of inorganic grains having a diameter <500 &mgr;m, wherein the fraction containing the inorganic grains is added in the form of a granular material which contains the inorganic grains which, with the aid of a water-soluble polymer, are bound so as to form the granular material. As a result, a homogeneous mortar is obtained.

Abstract: Methods of agglomerating hydraulic cement powder to improve its flow and handling characteristics are provided. One embodiment of the methods of the present invention is comprised of the steps of forming a mixture of the hydraulic cement powder with a particulate solid disintegrating agent, the disintegrating agent having the property of causing the break up of the agglomerated cement powder upon contact with water. Thereafter, the mixture is compressed into agglomerated pellets.

Abstract: A non-metallic product (NMP) substantially free of metallic aluminum and aluminum nitride which is utilized for making calcium aluminate.

Abstract: This invention aims to provide an inorganic porous body which can be ensured with high strength and high porosity and which is applicable to soil conditioners. The inorganic porous body has a pellet-shape having pores, includes 50% and more silica by weight, and 20% and more alumina by weight. Also, the inorganic porous body has a porosity of 40% and more by volume. The sludge, which discharged from casting foundries as sludge-wastes and which has an ignition loss of 20%, is utilized as a starting material. The starting material is mixed with water to make a mixture, the mixture is formed to become pellets, and the pellets are burned.

Abstract: The invention relates to a method for manufacturing cement clinker whereby the raw meal is initially subjected to preparatory processing, e.g. by comminution, homogenization and/or drying, and, eventually, nodulized and burned, with the nodulization process itself taking place in a stationary burning reactor. By the method according to the invention a sulphatic compound is added to the raw meal in a sufficient quantity before introducing the raw meal into the stationary burning reactor or directly into the stationary reactor, e.g. through the combustion air or together with the fuel. The sulphatic compound may be selected among all types of sulphates which will not affect the properties of the finished cement. It is particularly advantageous to use calcium sulphate, either naturally occurring or industrial by-products and regular waste materials, e.g. used absorbent from dry exhaust gas desulphurization.

Abstract: A process of treating dust from a cement manufacturing operation. The process comprises adding carbon bearing material to the dust catch from a cement manufacturing operation to form a mixture, which is formed into nodules and sizing the nodules to obtain a feed material having a selected size range. The nodules are directed as feed material to a fluidized bed which is maintained by passing air for combustion upwardly through a bed of material. The material is thermal processed within the fluidized bed in a reducing atmosphere by supplying fuel for combustion in the fluidized bed to maintain temperatures sufficient to volatilize alkali and sulfur compounds in the feed material and produce a product having an increased concentration of cement forming compounds and reduced alkali and sulfur compounds as compared to the feed material. The reduced clinker is then re-oxidized to minimize/reverse adverse color and mineralogy.

Abstract: The present invention relates to hydraulically bonded cement compositions and methods. More particularly, the present invention is directed to novel compositions and methods of hydrating hydraulic cement without mechanical mixing of the cement and water. The present invention includes materials prepared by manipulating under pressure powdered hydraulic cement compositions using known or novel powder packing, casting, or expanding techniques, such that air within the powdered hydraulic cement is substantially removed while the cement is formed into a self-supporting near net final position. Thereafter, the formed hydraulic cement is hydrated without mechanical mixing of the cement and water.

Abstract: With the present invention, a feed preparation system for producing cement includes mixing raw materials with a source of potassium. The mixture is conveyed to feed preparation system where it is placed in condition for treatment in a fluidized bed reactor for thermal processing to produce cement clinker. The potassium combines with the SO.sub.2 generated in the process to form potassium sulfate solids that are filtered from the process gas stream before emission to the atmosphere to thereby reduce sulfur emissions from the fluid bed cement process. The starting material may include white cement raw meal, grey cement raw meal and cement kiln dusts.

Abstract: Aggregates, matrices, and composites exhibiting enhanced structural characteristics, together with methods and apparatuses for their manufacture, are disclosed. Many of these embodiments rely on three dimensional reticulation to enhance material property features, such as fracture toughness and resistance to thermal shock.

Abstract: A method for producing building sheets containing cement, inert materials and additives and reinforced with plastic mesh, starting from a cement mix which does not contain more water than that desired in the formed sheet prior to hardening, the necessary fluidity of the cement mix being obtained by adding a fluidiser.The apparatus and method are therefore simplified.

Abstract: An aggregate is produced from waste glass which is initially crushed to a granular state and is thereafter roughened at its surfaces and rounded at its edges. This result is obtained by a grinding treatment. The aggregate can be used for concrete. It allows an excellent adhering of the cement and it gives practically no rise to the danger of injury during the handling thereof.