Fast settling concentration tank for sewage in gangue

Abstract

A fast settling concentration tank for sewage in gangue includes an outer cylinder and an inner cylinder connected in the outer cylinder by a first bracket. The upper end of the inner cylinder is a sewage inlet. A baffle plate is provided in the middle of the inner cylinder by a second bracket. A feeding gap is formed between the edge of the baffle plate and the inner wall of the inner cylinder. At least one annular return plate is fixed on the outer wall of the inner cylinder. An overflow gap is formed between the outer edge of the return plate and the inner wall of the outer cylinder. A residue outlet is formed at the lower portion of the outer cylinder. An overflow tank is formed at the upper end of the outer cylinder. The overflow outlet of the overflow tank is separated from the sewage inlet.

What is claimed is: 
     
         1 . A fast settling concentration tank for sewage in gangue, comprising an outer cylinder and an inner cylinder sleeved inside the outer cylinder by a first bracket, the inner cylinder having a sewage inlet at an upper end thereof, a baffle plate provided in a middle of the inner cylinder by a second bracket, a feeding gap formed between an edge of the baffle plate and an inner wall of the inner cylinder, at least one annular return plate fixed on an outer wall of the inner cylinder, an overflow gap formed between an outer edge of the annular return plate and an inner wall of the outer cylinder, a residue outlet formed by tapering a diameter of a lower portion of the outer cylinder, an overflow tank formed at an upper end of the outer cylinder, the overflow outlet of the overflow tank being separated from the sewage inlet. 
     
     
         2 . The fast settling concentration tank for sewage in gangue as claimed in  claim 1 , wherein the baffle plate has an arc shape which has a high middle portion and a lower edge, and the baffle plate has a diameter which is a half of a diameter of the inner cylinder. 
     
     
         3 . The fast settling concentration tank for sewage in gangue as claimed in  claim 1 , wherein the annular return plate is inclined at an angle of 30 degrees relative to a horizontal plane. 
     
     
         4 . The fast settling concentration tank for sewage in gangue as claimed in  claim 1 , wherein the first bracket is composed of a plurality of connecting rods, the overflow outlet is located at an outer wall of the overflow tank, and the residue outlet has a diameter which is a quarter of a diameter of the inner cylinder. 
     
     
         5 . The fast settling concentration tank for sewage in gangue as claimed in  claim 1 , wherein two annular return plates are fixed on the outer wall of the inner cylinder, one is fixed at a lower end of the inner cylinder and the other is fixed at a middle section of the inner cylinder.