Abstract: A power-plant clarifier sludge having the following dry composition:______________________________________ SiO.sub.2 2 to 30 weight percent, Fe.sub.2 O.sub.3 2 to 20 weight percent, Al.sub.2 O.sub.3 0.5 to 5 weight percent, CaO 15 to 50 weight percent, MgO 1 to 8 weight percent, MnO 0.01 to 0.5 weight percent, Na.sub.2 O 0.1 to 0.5 weight percent, K.sub.2 O 0.1 to 1 weight percent, SO.sub.3 in sulfate 0.1 to 2 weight percent, and CO.sub.2 in carbonate 5 to 40 weight percent; ______________________________________is used in the desulfurization of power-plant flue gas and the desulfurization slurry is dewatered and pressed into construction blocks.

Abstract: Self-driven vehicle for pipelines comprising: a cylindrically designed vehicle body (1) through which and/or around which the pipeline's (10) medium flows, a drive unit (2) on the vehicle body (1) which resiliently bears against the pipeline's (10) internal surface, a hydraulic system which powers the drive module (2), a power supply system for operation of the hydraulic system, and a controller (22) which at least controls the vehicle's movement in the pipeline (10).

Abstract: A process is described for making flue gas gypsum from desulfurization of power plant exhaust gas. The process comprises treating the flue gas in a wash tower with a wash water suspension containing calcium oxide, calcium hydroxide or calcium carbonate and converting the scrubbed sulfur dioxide by oxidation with input atmospheric oxygen and by crystallization to calcium sulfate dihydrate crystals. A cyclic flow is drawn from the wash tower sump and delivered by spray nozzles to the wash tower. Further the process comprises continuously drawing an additional crystal suspension from the wash tower sump which after separation of a crystal slurry is partly fed back to the wash tower sump. The lower run-off of a cyclone separator receiving the crystal suspension is dewatered, the flue gas gypsum is separated and a clear effluent is returned to the wash tower. A partial flow is separated from the upper run-off of the cyclone separator and a solid free fluid replaces it.

Abstract: Alignment tool for the remotely controlled recalibration of resilient protruding contact dimples or springs in substantially square spacer grid meshes of nuclear reactor fuel assemblies, including an outer centering tube adapted to the cross section of a spacer mesh and rigid and resilient contact dimples protruding into the interior of the mesh in given directions, the outer centering tube having a window formed therein in the vicinity of the contact dimple, a gripper-actuating tube being concentrically surrounded by and axially movable within the outer centering tube, a pendulum rod having a free end and being disposed in the interior of the gripper-actuating tube and being axially fixed relative to the gripper-actuating tube and able to oscillate in the given protrusion direction of the resilient contact dimple to be recalibrated, a gripper attached to the free end of the pendulum rod, a restoring spring for exerting pressure on the gripper, and a run-on incline formed on the pendulum rod being engageable