摘要:
A centrifugal pump for a slurry combines design changes with respect to conventional configurations that produce quasi-laminar flow and materially extend the life of the casing. The cutwater clearance of the casing is increased to a range of 0.20 to 0.25 times the diameter of the impeller. The casing includes a redesigned removable annular liner with a diameter increased to at least 1.15 times the diameter of the impeller. The pump preferably also has an axially adjustable wear ring with a diameter increased such that it extends by at least 10% over the diameter of the area of interface between the wear ring and the impeller.
摘要:
Disclosed is a method for calcining a natural chalk powder within a rotary kiln. The powder is inserted into the kiln accompanied by an additive that promotes nodulization of the powder to thereby facilitate the treatment of the chalk powder within the rotary kiln. The nodulization takes place at temperatures less than the calcining temperatures of the chalk and prior to the nodulized chalk being calcined within the kiln.
摘要:
A feedwell for a thickener/clarifier includes a feedwell body (40), a feedwell inlet (41), a sidewall (42), and a discharge opening (48). At least one infeed conduit (21) is connected at an upstream end of the feedwell inlet (41). The sidewall (42) has a non-cylindrical curved peripheral surface defining a radially-outermost fluid boundary surface for an influent stream (60). The non-cylindrical curved peripheral surface may include portions of a volute surface, coil surface, helical surface, compound curve surface, spline curve surface, or spiral surface. Feedwells according to the invention provide a uniform settling tank feeding flux around exiting portions of the feedwell, control velocity gradients and shear rates, protect flocculated aggregates, normalize sedimentation conditions in the settling tank, and prevent large local accelerations and flow non-uniformities.
摘要:
A conveyor apparatus includes a first conveyor apparatus and a second conveyor apparatus. The first conveyor apparatus is positionable adjacent to a feed conveying device. The first conveyor apparatus is configured to pivot about a position adjacent to the feed conveyor device or move laterally adjacent to the feed conveyor. The second conveyor apparatus is configured to move such that the second conveyor apparatus maintains a position substantially parallel to the first conveyor apparatus when the first conveyor apparatus moves or pivots. In some embodiments, the second conveyor apparatus may also be configured to move along a path so that the second conveyor apparatus is extendable beyond an end of the first conveyor apparatus. The path may be a linear path and may be substantially parallel to the length of the first conveyor apparatus such as a path that extends in a direction that is a few degrees off of being perfectly parallel.
摘要:
A sludge or slurry physical stabilizing method combines coarse particles with a slurry of fine particles to generate a composite slurry having a substantially predetermined ratio of coarse particles to fine particles. The composite slurry can then be diluted, flocculated and dewatered. Superabsorbent polymer (SAP) is mixed in with the dewatered composite slurry in an amount effective to produce a somewhat friable, semi-solid conveyable composition of sufficient strength to enable transport, stacking and support of restored overburden at a mining site.
摘要:
A conveyor apparatus (5) is provided that includes a frame (10) and a cross conveyor (9). The cross conveyor (9) has a moveable belt sized and configured to receive and move material. The cross conveyor (9) is supported by the frame (10). The frame (10) has a base and a plurality of rotatable members (15) attached to the base. The rotatable members (15) are configured to rotate to move the frame (10). The frame (10) is sized and configured to be positionable adjacent to a mobile bridge (3) conveyor having a tripper conveyor device (7) such that a portion of the cross conveyor (9) is positionable under an upper end portion of the tripper conveyor device (7) to receive material from the tripper conveyor device (7) and move the material to a storage area or stacking area for stacking the material. The tripper is preferably constrained to the frame (8) of the mobile bridge conveyor (3).
摘要:
A description is given of a method for manufacturing cement by which method cement raw materials, such as limestone and clay, are comminuted in a comminution apparatus (1) for subsequently being heated and burned into cement clinker which is subsequently cooled and then directed to a comminution apparatus (1) for comminution to cement. The method is characterized in that said cement raw materials and said cement clinker alternately undergo comminution in one and the same comminution apparatus (1).