SU912208A1 - Thickener - Google Patents

Description

I

The inventive 1e relates to wastewater treatment, more specifically to devices for clarifying and thickening suspensions of flotation waste, sludge and wastewater, and can be used in the coal, metallurgical, and construction industries.

A vertical settling tank is known to have a loading and unloading device, a cylindrical tank with a conical bottom. The loading device consists of a cylindrical shell and a guide conic element installed with a gap and located above the conical bottom of the joint venture.

The disadvantage of such a settling tank is the destruction of the sediment deposited on the cylindrical shell and draining it into the drain due to the increased velocity and turbulence of the flow as it passes through the gap; between the cylindrical shell and

guide conic element. This leads to a decrease in the performance of the device as a whole.

Closest to the proposed technical essence and the achieved effect is a device having a settling tank with loading devices and a conical insert C21.

suspended layer in conical

10, the insertion is formed under the condition that the deposition rate of the particles is equal to the speed of the upward flow. An increase in the velocity of the upward flow leads to the removal of particles into the drain, i.e.

15, the performance of such a thickener is limited by the upper limit value of the speed of the ascending flow.

The aim of the invention is to improve the performance of the device.

Claims (2)

This goal is achieved by the fact that in the thickener, which includes a sedimentation tank with loading and unloading devices and a conical part, the conical insert is made with 4 layers, while the inner cone is made of permeable material. The height of the inner cone is 2/3 the height of the outer cone. The presence of a water-permeable layer on the inner conical insert increases the area of clarification with the titres. This reduces the vertical on the component of the velocity of the upward flow of the pulp, increases the dynamic equilibrium of the suspended layer and the hydraulic coefficient of volumetric use of the thickener, and ultimately increases its shock performance. FIG. 1 shows the proposed thickener, a general view; in fig. 2, section A-A in FIG. 1. The thickener contains a sedimentation tank 1 with a loading device 2 and a discharge device 3 :, catchment chutes 4, an air vent tube 5, conveying vanes 6, an inner conical insert 7 made of a permeable layer 8 and an impermeable layer 9 whose height is equal to 2 / 3 the height of the conical insert 7, the receiving chamber 10. The device operates as follows. The initial pulp treated with flocculate is fed through the loading device 2 tangentially into the receiving chamber 10 located between the surfaces of the settling tank 1 and the impermeable layer 9 of the inner conical insert 7. From the receiving chamber 10 the pulp consisting of flocculating particles rushes to Milling blades 6, while a portion of the pulp passes through the impermeable layer 8 of the inner conical insert 7, which delays the flocculated particles, thereby performing a pre-clarification operation. The flocculated particles in the form of large aggregates are deposited and condense in the conical part of the sedimentation tank 1. Smaller floccules are carried away 4 through spraying vanes into the bulk of the internal conical insert 7, where a layer of suspended particles is formed. Passage through the suspended layer, flocculated particles are retained, enlarged and precipitated into the conical part under the action of gravity. The conical shape of the inner insert allows the particles settled on it to move down and condense in the conical part of the sedimentation tank 1. The pulp, passing through the suspended layer, is clarified and enters the catchment chutes, the air is removed through the air discharge pipe 5 3. The proposed thickener organically combines three methods of pulp purification — sedimentation, purification through a suspended layer, and filtration through a permeable section of the inner conical insert. This permits an increase in the productivity of the thickener without changing the quality of the final products. The expected economic effect from the implementation of the invention is 50-70 thousand rubles. in year. Claim 1. A thickener comprising a settling tank with loading and unloading devices and a conical insert, characterized in that, in order to increase productivity, the conical insert is made of multi-layer, while the inner cone is made of permeable material. 2. A thickener according to Claim 1, characterized in that the height of the inner cone is 2/3 the height of the outer cone. Sources of information taken into account during the examination 1. USSR author's certificate No. 565681, cl. In Ot D 21/00, 19772. Tsvetna metallurgists, N 19, 1962. with. 12.