SU902787A1 - Thickener - Google Patents

Description

(5) COUPLER

I

The invention relates to apparatuses for separating suspensions with a solid dispersed phase, in particular to thickeners, and can be used in the chemical and other industries.

A device for thickening slurry and clarifying liquids is known, comprising a housing with input devices and output devices for separation products, the device for compacting and unloading sediment in the form of two parallel rolls. One of the rolls covers an endless belt, which acts as a conveyor of sludge to the gap between the SP rolls,

The drawback of the apparatus is the low quality of separation, which is a consequence of the sedimentation of the sediment layer by the liquid phase, which is displaced upward by the rolls during the compaction of the precipitate, i.e. deterioration of sealing conditions.

The aim of the invention is to improve the quality of separation by improving the compaction conditions of the discharged sludge.

The goal is achieved by the fact that the thickener, which includes the case, the device for introducing the suspension and the withdrawal of the clarified liquid with a device for compaction and discharge, is provided with a duct, the lower edge of which is located between the discharge rollers and the upper one above the layer of condensed product.

The drawing shows a diagram of the proposed thickener.

Claims (1)

The thickener comprises a housing 1, which is a precipitation tank. A pipe 2 for supplying the initial suspension is introduced into a still glass 3. located at the top of the thickener. The housing has a drain chute A which communicates with the pipeline 5 for draining the clarified liquid. In the bottom 6 of the housing there is an opening for the withdrawal of the condensed product. Two rolls 7 adjoin the edges of the hole below and the configuration of the edges corresponds to the configuration of the intersection line of the bottom 6 with the rolls 1. The rolls 7 are in a known manner spring-loaded counter, connected with rotation and together with the hole in the bottom form a device for unloading the thickened product. The thickener is provided with a duct 8, the lower edge of which is located at the shed of the rolls 7) and the upper — above the zone of the constrained seal in the housing 1. To quench the liquid velocity in the upper part of the duct, it can be made with expansion upwards. Preferably, the rolls 7 have an elastic coating with a thickness of at least 0.5 of the particle diameter of the dispersed phase. Works thickener as follows. The initial suspension is supplied through pipe 2 to the soothing cup 3 from which it enters the volume of the body t, which is in the filled state when operating. Due to the difference in solids and liquid phase solids, solid particles settle down on the bottom 6 of the thickener, and the clarified liquid collecting from the top flows over the upper edge of the housing 1 into the discharge chute k, from where it is withdrawn via pipeline 5. After settling on the bottom 6, the solid phase forms a zone compaction. Particles compacted to a concentration of about 60 suspensions falling on the mouth of the counter rotating from the rolls 7 are carried away by them due to the presence of the tretzi; as the space between the rollers narrows, the particles further condense and come down as a wet sludge, and the liquid displaced from the pores of the sediment rushes up. The displaced liquid enters the box 8, due to which the sediment is not agitated, and along it lies a precipitation zone located above the zone of constrained compaction, where it again participates in the precipitation process. . Thus, the proposed thickener can significantly improve the quality of separation by improving the compaction conditions by removing the displaced liquid from the gap between the rollers. Achieving this contributes. also the elastic coating of the rolls, since this allows, in comparison with solid metal, to increase friction with the dispersed phase when captured by the rolls and to reduce the porosity along the sediment-roll interface in the cross section of the greatest compression, thereby further reducing the amount of liquid phase being withdrawn. Claim 1. A thickener comprising a housing, devices for introducing suspensions and withdrawal of a clarified liquid, and a device for compacting and unloading a thickened product, made in the form of two parallel spring-loaded rollers, characterized in that, in order to improve the quality of separation by improving the conditions of compacting, thickened product is provided with a box, the bottom edge of which is located between the rollers, and the top - above the layer of condensed product. Sources of information taken into account in the examination 1. US patent No. 4104168, cl. 210-297, 1973. J n at