SU1430058A1 - Apparatus for flocculation - Google Patents

Abstract

The invention relates to devices for flocculation and can be used in the chemical industry in the process of flocculation and coagulation of suspensions. The invention allows for enhanced functionality and reduced reagent consumption by allowing the control of flocculation zones. The apparatus for flocculin contains a body, coaxially arranged with it nozzles for inlet and outlet of the processed suspension and reagent, disks (D) installed in it, the lower of which is rigidly mounted on the shaft, and parallel fingers placed on their adjacent planes, fixed in a checkerboard order D is perforated and coaxial with the case, the upper one of the disks is rigidly connected to the case, and the lengths of the fingers of the disks 1 and 1-2, respectively, are determined from the ratios ii (0.8-0.9) / g, / 2 (0 , 3- 0.4) / g, where / g is the distance between adjacent planes of the disks. 2 Il. with SS

Description

four:

00

ate

00

The invention relates to devices for phdoculation and can be used in the chemical industry in the process of flocculation and coagulation of suspensions.

The purpose of the invention is to expand the functional capabilities and reduce consumption; reagent by allowing regulation of flocculation zones.

FIG. 1 shows an apparatus for flocculation, longitudinal section; in fig. 2 is pa & A-A in FIG. one.

I The device for flocculation contains the root: 1, coaxially located patruecians in it to enter the treated suspension and reagent 2 and to withdraw the processed suspension 3. In the case 1 coaxially with it and the nozzles 2 and 3 disks 4 and 5 are installed to re-mix the suspension and reagent. The upper disk 4 is rigidly connected to the housing 1, and the lower disk 5 is rigidly mounted on one 6. In addition, disks 4 and 5 are made with perforations 7 and 8, for example, in the form of evenly spaced holes in the shape of truncated sectors , on their adjacent areas evenly distributed across the entire area parallel fingers 9 and 10, fixed in a chessboard. The length / i of the fingers 10 located on the disk 5 is determined from the ratio i / (0.8-0.9) / i, and the length / 2 of the fingers 9 located on the disk 4 from the ratio / o (0.3 0.4) / g, where h is the distance between the disks.

Apnarat works in the following way. When the shaft 6 is rotated, the suspension (pulp) and the reagent are introduced through the nozzle 2 into the body 1 of the apparatus. The passage through the perforation 7 of the disk 4 rigidly fixed on the body 1, the suspension and the reagent are pre-mixed and evenly distributed in the cross section of the body 1 before entering the intensive mixing zone formed by the fingers 9 and 10 mounted on the fixed 4 and rotating 5 disks. In the zone of intensive mixing, the process of distribution of phacules in the suspension volume takes place and, simultaneously with mixing, the process of formation of small primary floccules occurs, the size of which does not exceed 0.05-0.1 mm. These floccules are formed by adsorption of relatively low molecular weight particles on the surface; | The polymer has a higher adsorption rate than the high molecular weight fraction. Due to the relatively low molecular weight, and therefore, the floc is a compact aggregate of solid particles with low porosity. Because of this, the intensity intensity of the pulsations and the magnitude of the tangential effects arising in the zone of intensive mixing turn out to be rather small and do not destroy the primary ag1) egats.

From the intensive mixing zone, the partially flocculated suspension enters the flocculation zone. Here, a decrease in the intensity of mixing is provided by reducing the number of mixing elements (only the fingers mounted on the lower rotating disk) and their unidirectional movement. A decrease in the intensity of mixing ensures a decrease in the diffusion coefficient, which creates conditions for the adsorption of the high molecular part of the flocculus on the initially formed aggregates of particles and the formation of relatively large aggregates during the coagulation process. The treated slurry through the radial holes 8 and the discharge port 3 is withdrawn from the mixer for further processing.

When changing the flow rate or characteristics of the flocculated suspension and reagent, optimal flocculation conditions are provided by changing the volumes of intensive and smooth mixing achieved at vertical movement of the shaft with a rotating disk inside the agtarate.

The use of a flocculator of the proposed design with a relative length of movable and stationary units of 0.8-0.9 and 0.3-0.4, respectively, all other conditions being equal (ensuring a given deposition rate) ensures a reduction in the flocculant flow rate from 0.55 to 0 3-0.38 kg / t.

Changing finger lengths outside the specified ranges does not lead to a significant decrease in the flocculant dosage, which is explained, apparently, either by reducing the volume of the active mixing zone or by shifting it to the lower rotating disk, which corresponds to a decrease in 3OHjji kneading and maturing of the flocs.

Claims (1)

Invention Formula A flocculation apparatus comprising a body with loading and unloading nozzles, disks mounted in the body with parallel fingers arranged on their adjacent planes in a staggered manner, one of which is rigidly fixed on the shaft, characterized in that, in order to expand the functional capabilities and reducing reagent consumption due to the ability to control flocculation zones, the discs are perforated and horizontally aligned with the body, the top disk is rigidly connected to the body, and the lengths of the fingers are vertical xy 1 and bottom / 9 disks are determined from the correlations /, (0.8-0.9) / g; / 2 (0.3-0.4) / g; where / I is the distance between adjacent disc planes. PeaeeHf .i