Production of a porous aluminum filter for a diaphragm pump

Abstract

A method produces a porous, arched aluminum fluidization element for a diaphragm pump for fluidizing, covering and delivering pulverized products, such as pulverized coal, using inert gas at pressures of up to 7 MPa. The fluidization element ensures that fluidizing gas is supplied and homogeneously distributed in the pump lower region, and the contour of the space for pulverized materials may be advantageously designed in the diaphragm deflection area and optionally adapted to the diaphragm guide rod. In this way, a homogeneous and reversible deformation of the diaphragm is obtained with minor wear as far as possible. At the end of the delivery process of the diaphragm pump, the diaphragm is applied to the arched, half-shell-shaped fluidization surface in an extensively flat manner, and a small dead volume can be obtained, which results in minimal space for pulverized materials with a high delivery rate and little high-pressure gas loss.

1 . A method for producing a gas-permeable body which is formed with aluminum, in which method
 salt is admixed to an aluminum melt,   the mixture composed of aluminum melt and salt is allowed to solidify,   the solidified mixture is processed into the desired body form, and   the salt is removed from the body form by means of a dissolution process.   
     
     
         2 . The method for producing a gas-permeable body as claimed in  claim 1 ,
 wherein   the desired porosity and filter fineness is set by means of the size of the salt grains.   
     
     
         3 . A gas-permeable body composed of aluminum, which is produced by means of the following sequence of working steps:
 admixing salt to an aluminum melt,   solidifying the mixture composed of aluminum melt and salt,   processing the solidified mixture into the desired body form, and   removing the salt from the body form by means of a dissolution process.   
     
     
         4 . The gas-permeable body as claimed in  claim 3 ,
 wherein a porous metallic filter material is formed.   
     
     
         5 . The gas-permeable body as claimed in  claim 4 , wherein the fineness of the filter material amounts to <40 μm. 
     
     
         6 . The gas-permeable body as claimed in  claim 4 ,
 wherein   the fineness of the filter material amounts to <20 μm.   
     
     
         7 . The gas-permeable body as claimed in  claim 3 ,
 wherein   the gas-permeable body is connected to a gas-impermeable body so as to form a unit.   
     
     
         8 . The gas-permeable body as claimed in  claim 3 ,
 wherein   the gas-permeable body is part of a gas-impermeable aluminum body.   
     
     
         9 . The gas-permeable body as claimed in  claim 3 ,
 wherein   the body form is adapted to the deflected form of a diaphragm of a dust pump.   
     
     
         10 . The gas-permeable body as claimed in  claim 3 ,
 wherein   a dust feed pipe ( 7 ) is connected at the lowest point.   
     
     
         11 . The gas-permeable body as claimed in  claim 3 ,
 wherein   at least one support ( 8 ) is formed integrally.