Abstract: A process for producing cement clinker according to the invention comprises dry grinding of raw components, mixing the resultant raw meal with a solid fuel, pelletizing the resultant batch with the addition of calcium chloride thereto, subsequently heat treatment of the resultant pellets of a raw mix in their dense layer in zones of drying, roasting by burning a fuel over the surface of the layer with drawing fuel combustion products therethrough and removal of exhaust gases released therefrom, and cooling the resultant clinker. According to the invention, the temperature of fuel combustion products over the surface of the dense pellet layer is maintained at 1150.degree.-1250.degree. C. within a portion of the roasting zone extending over a length of maximum one half of the roasting zone length, with subsequent lowering of this temperature to between 900.degree. and 1000.degree. C.

Abstract: A raw mixture for the production of a cement clinker which consists of lime, argillaceous and ferrous components and a mixture of chlorides of calcium, potassium and sodium, the components being contained in the following proportions, percent by mass:lime component: 55 to 63argillaceous component: 23 to 17ferrous component: 4 to 1calcium chloride: 17.8 to 4potassium chloride: 0.1 to 7.5sodium chloride: 0.1 to 7.5.The raw mixture is useful in the low-temperature processes for production of cement. The use of the raw mixture according to the present invention makes it possible to utilize alkali-containing raw materials (soda production wastes, cement dust recycle).

Abstract: A raw mixture is provided for the production of a refractory high-alumina cement which consists of a calcareous component, an aluminous component and a chloride of at least one of the metals selected from the group consisting of magnesium, calcium, barium, strontium, sodium, potassium; the components are present in the raw mixture in the following amounts, percent by mass:aluminous component (calculated for Al.sub.2 O.sub.3): 69 to 73calcareous component (calculated for CaO): 11 to 23chlorides of said metals: 20 to 4.

Abstract: A raw mixture for the production of a cement clinker which consists of lime, argillaceous and ferrous components and a mixture of chlorides of calcium, potassium and sodium, the components being contained in the following proportions, percent by mass:lime component --55 to 63argillaceous component --23 to 17ferrous component --4 to 1calcium chloirde --17.8 to 4potassium chloride --0.1 to 7.5sodium chloride --0.1 to 7.5.The raw mixture is useful in the low-temperature processes for production of cement. The use of the raw mixture according to the present invention makes it possible to utilize alkali-containing raw materials (soda production wastes, cement dust recycle).

Abstract: Cement is disclosed having the following composition, in percent by weight: 20 to 75% of highly basic calcium chlorosilicate, 10 to 55% of calcium chloro-orthosilicate, 0.5 to 30% of calcium chloroaluminate, 2 to 20% of calcium chloroalumoferrite; cement of the foregoing compositions is produced by calcining at a temperature within the range of from 1,000.degree. to 1,200.degree. C. a raw mixture containing a calcareous component, silicaceous component, aluminous component, ferrous component, magnesium-containing component and calcium chloride in particular proportions, and then grinding the resultant cement clinker. This cement features a reduced heat emission in the initial stage of the hydration process and possesses a high activity. No corrosion of steel reinforcement is observed in concretes produced from the present cement. The cement can be used in heavy-duty concrete structures such as hydropower dams, in the production of high-strength concretes and ferroconcrete structures.

Abstract: Apparatus for treatment and making of construction materials and the like having a rotary kiln. Calcined material from the rotary kiln is reduced in size by driven rolls and delivered as free-flowing material at an upper end region to a vertical shaft kiln having peripheral walls inclined from the vertical no more than 3.degree. and diverging downwardly. A sidewall of the shaft kiln has perforations inclined downwardly for flow of hot gases into the shaft kiln in the general direction of flow of material downwardly in said shaft kiln. The treated material from the shaft kiln is discharged from a lower end region and transported therefrom by a grate system having heaters for heating the treated material thereon.

Abstract: A specific feature of the disclosed apparatus comprising burners disposed along the generatrix of the shell of the kiln and provided each with a plurality of nozzles each whereof is located in the refractory lining of the kiln, consists of a cylindrical portion the outlet wherefrom is provided in the form of converging as well as diverging cones and accommodates an axially disposed hollow movable rod which is provided with perforations within a portion passing through a gas chamber and is linked up with a drive by way of a means of actuation is that the gas chamber is fixed outside the nozzle the cylindrical portion, the converging cone and the diverging one whereof are located coaxially and successively looking in the direction wherein the mixture of steam, gas and air flows, the rod is spring-loaded in the axial direction and provided at its end facing the outlet from the nozzle with a hollow valve head pierced with through passages to obtain communication with the space inside the cylindrical portion of th

Abstract: A device for recovery of chlorine-containing compounds from waste gases having a chamber for passage of waste gases, including an inlet and outlet pipes and fans arranged in pairs inside the chamber along the gas flow, one opposite another, their blades being arranged parallel to the flow of waste gases through the chamber.

Abstract: A flexible cam system characterized by the use of flexible guide tracks provided with balance weights attached thereto. The guide tracks are connected to a supporting frame through regulating drive mechanisms provided therefor and mounted on opposite sides of the frame. The drive mechanisms are connected respectively with one end of each of said guide tracks rigidly, and with the other end thereof, movably, through guide rollers fixed thereto.

Abstract: A process for producing cement comprises grinding of a mixture of raw components containing calcium chloride. The resulting raw mixture is subjected to calcination at a temperature within the range of from 1,000 to 1,100.degree. C to produce a clinker which is then crushed at a temperature of from 900 to 1,100.degree. C. The crushed clinker is fractionated at a temperature of from 1,000 to 1,100.degree. C with a stream of the fuel combustion products at the speed thereof of from 6 to 30 m/sec. Two clinker fractions are thus obtained, namely: a fraction with a particle size of from 3 to 20 mm and a fraction with a particle size of from 0.1 to 3 mm. Each fraction is separately desalted at a temperature of from 900 to 1,100.degree. C by way of contacting with a stream of the heating agent comprising the fuel combustion products. The resulting desalted clinker fractions are cooled and ground.

Abstract: A cement is disclosed having the following composition in per cent by weight:______________________________________ (I) clinker minerals: (a) a highly-basic calcium chlorosilicate 35 to 75 (b) calcium chloro-orthosilicate 10 to 55 (c) calcium chloroaluminate 2 to 30 (d) calcium chloroalumoferrite 4 to 16 (2) calcium oxychloride 0.5 to 2 (3) calcium chloride chemisorbed on the clinker materials 1.2 to 2.