FR2662372A3 - Decanter (sedimentation) centrifuge - Google Patents

Abstract

The decanter centrifuge has a casing (1), a drum (2) and a feed screw (5). Conical bodies (10, 11) are installed concentrically around the conical part of the drum (2). They reduce the residual water content of solid matter with a highly dispersed solid phase. An outer body (10) is rigidly joined to the drum (2); an inner body (11) is mounted on the feed-screw drum (4). Endless removal screws (12, 13) are fixed to the outer faces of the drum (2) and of the inner body (11) for transporting the solid matter.

Description

The present inv ation relates to a decantation centrifuge

  to separate heterogeneous liquid mixtures using central forces

  The centrifuges for settling according to the invention can be used in the metallurgical, chemical, pharmaceutical industry.

or the like.

  A known decanting centrifuge (US Patent US 4,212,723 has a drum, a worm screw and windows for the evacuation of liquid M; nté and solids The drum of this centrifuge has a conical body or d conical drum-shaped element for further drying of solids In the known settling centrifuge, the solids content of the

  decanted liquid is relatively high, and we need a

  relatively high workout due to the rotation of the

  additional body, the diameter of which is greater than the maximum diameter

main drum hurt.

  Also known is a decanting centrifuge comprising a casing, a cylindrical and conical drum, a worm which consists of a cylindrical and conical drum and a spiral fixed on the latter, a set of discs arranged inside of the

  cylindrical part of the worm drum, some windows

  intended to evacuate the decanted liquid and the solid matter and available

  at the ends of the drum, a supply hose and a device

training tif.

  In this known centrifuge, the residual water content of the ma-

  solid is relatively high due to the short length

of the drying area.

  The object of the present invention is to lower the water content

  very dispersed solid phase solid matter.

  According to the invention, this object is, for a decanter centrifuge -

  tion comprising a housing, a cylindrical and conical drum, an endless screw which consists of a cylindrical and conical drum of endless screw and a spiral fixed on the latter, a set of discs arranged inside the cylindrical part of the worm drum, some openings intended to evacuate the decanted liquid and the

  solids and respectively disposed at the ends of the drum

  bour, a supply pipe and a drive device, by installing additional conical bodies or else conical elements in the form of drums, which are arranged concentrically around the conical part of the drum In order to further dry plus solids, an outer body is rigidly assembled to the drum, and an inner body is assembled to the worm drum, some spiral bands being fixed as an evacuation worm on the outer faces of the drum and

  inner body, for the transport of solids.

  The following discussion describes in more detail an example of an implementation

  tion of a decanting centrifuge according to the invention using the appended drawings, in which: FIG. 1 is a view in longitudinal section of a decanting centrifuge, FIG. 2 is a view in longitudinal section of a construction variant, and

  Figure 3 is a sectional view of an embodiment detail.

  The decanting centrifuge has a casing 1, a cylindrical and conical drum 2, a worm device 3 which consists of the cylindrical and conical drum of worm 4 and a worm 5 fixed on the latter, a set of discs 6 disposed inside the cylindrical part of the drum of the worm device 3, openings 7, 8 respectively intended for discharging the decanted liquid and the solid materials, a supply pipe 9, a

  drive device not shown, and conical bodies sup-

  10, 11, which are arranged concentrically around the

  conical part of the drum 2 The outer body 10 is assembled rigidly

  the drum 2, and the inner body 11 is assembled to the worm drum 4 Evacuation worms 12, 13 are fixed to the outer faces of the drum 2 and of the inner body 11 for the transport of solid materials. 14 openings are provided in

  the upper part of the inner body 11 for the evacuation of the ma-

  partially dehydrated solid bodies, and openings 15 are provided in the external body 10 for the evacuation of the separated liquid

solids.

  We will now describe the operation of the settling centrifuge. A suspension to be treated enters via the supply pipe 9 into the conical part of the drum 2, and forms there

  an annular layer, the inner radius of which is determined by the po-

  sition of the opening 7 for the evacuation of the decanted liquid During the separation, a layer of solid matter is formed from the

  solid particles that settle on the walls of the drum

  bour 2, layer which is transported by the worm 3 along the wall of the drum 2 to the lower end of the latter, and

  discharged through the inner body 11.

  The smallest suspended particles penetrate with the decanted liquid in the disc assembly 6 The particles deposited

  on the surfaces of the discs arrive on the wall of the cylinder part

  drique of the drum 2, and are transported by the worm 3 to its lower end, while the decanted liquid which flows through the disc assembly 6 is discharged from the centrifuge through the openings 7 The solids partially dried out of the drum 2 and arrive on the inner body 11, and there

  are transported by the discharge worm 12 to the openings

  tures 14, from which they are projected by centrifugation on the external body 10 The final drying takes place during transport by the

evacuation spiral 13.

  Liquid separated from solids on the inner body 11

  and on the outer body 10 is discharged through the openings 15 The ma-

  solids that have dried up or are dehydrated are removed from the center

tamper with openings 8.

  The increase in the length of the drying area of the ma-

  solids, and dehydration on additional bodies 10, 11 of larger diameter, allow the residual water content of widely dispersed solids to be reduced from two to three

time.

  The variant shown in Figure 2 also has a

  heating jacket H, which surrounds the casing 1.

  Figure 3 shows in section a variant for the separation of suspensions in which are contained crystals which are themselves lighter than the filter. In this case, a filter cloth F is provided which retains the crystals The filter is removed by means of a separate chamber FK and a discharge pipe S. In order to improve the drying of the separated crystals, the separation chamber can be connected to a condenser or to a vacuum pump system.

Claims (4)

  1 Decanting centrifuge, comprising a housing (1), a cylindrical and conical drum (2), a worm device (3) which consists of the cylindrical and conical drum of worm (4) and a screw endless (5) fixed on the latter, a set of discs (6) arranged inside the cylindrical part of the worm drum (4), some openings (7, 8) intended to evacuate the decanted liquid and the solids and respectively disposed   at the ends of the drum, a supply pipe (9) and a device   training device, characterized in that additional conical bodies   traps (10, 11) are installed to reduce the residual water content of the highly dispersed phase solids, and they are arranged concentrically around the conical part of the drum (2)   and serve to dry solids even more, an external body   laugher (10) being rigidly assembled to the drum (2) and an integrated body   laugher (11) being assembled to the worm drum (4), and evacuation worms (12, 13) being fixed on the external faces   the drum (2) and the inner body (11) for transporting the materials solid.   2 Decanting centrifuge according to claim 1, charac-   terized in that a heating jacket (H) is fixed around the casing   (1) to improve the drying effect.   3 Decanting centrifuge according to claim 1, charac-   terized in that in order to separate suspensions in which the crystals are lighter than the filtrate, the crystals are retained by a filter cloth (F), and the filtrate is discharged via a separate chamber (FK) and a drain pipe (S).   4 Decanting centrifuge according to claim 1, charac-   In that in order to improve the drying of the separated crystals, the separation chamber of the settling centrifuge is connected to a   condenser or to a vacuum pump system.