SU1636011A1 - Method for separating suspension or mixtures of two immiscible liquids in thin-layer settling tanks - Google Patents

Abstract

This invention relates to methods for separating slurries or mixtures of two immiscible liquids in thin-lined sedimentation tanks and can be used in the chemical, petrochemical, and other industries in both basic technological processes and for purifying wastewater from gypsum, sand, oil-contaminated, and difficult to remove oily precipitates. The purpose of the invention is to increase the separation efficiency by speeding up the removal of the difficult component while increasing the The method of separating suspensions or mixtures of two immiscible liquids in thin-layer clarifiers involves feeding the initial suspension or mixture, separating in a thin-layer block with inclined elements with the formation of a hard-to-separate component The frequency of vibrations is 0.5-75 Hz, the amplitude of vibrations is X (1-7) mm, and the speed of movement of the inclined elements satisfies the ratio 2.4 L vft k K 4.2, where V c is the average The speed of movement of the inclined elements of the thin-layer block in the direction opposite to the direction of removal of the difficult component} vne, k is the average speed of movement of the inclined elements of the thin-layer block in the direction coinciding with the direction of removal of the difficult component. The inclined elements can be shelf, tubular and other forms of cross-sections, and oscillations can be carried out only in a plane parallel to the inclined elements. Zil. Ј2 S (L 05 w 05

Description

The invention relates to methods for separating suspensions or mixtures of two immiscible liquids in thin-lagoon and can be used in the chemical, petrochemical and other industries in both the main technological processes and for wastewater treatment from

gypsum, sand, oil-contaminated, and other difficult to remove ointment-like sediments.

The purpose of the invention is to increase the separation efficiency by accelerating the removal of the component that is difficult to disassemble while increasing the productivity

Figure 1 shows a schematic of a counter-flow thin-bed sump, overtake the view; Fig 2 - thin-layer shelf unit, axonometric; figoZ - view A in FIG. one "

The method is carried out as follows.

The initial suspension through the pipe 1 is fed into the chamber 2 of the power supply. Reflected by the bump stop 3, the initial suspension enters the thin layer block 4 from the bottom and fills the apparatus cavity. Poured through the edge of the drain chutes 5, the clarified liquid enters them and through the nozzles 6 is withdrawn from the apparatus. adhering particles when moving in thin-layer channels between the shelves 7 are separated from the initial suspension, settling on the shelves 70 To operate the shelves without driving from the electric drive 8 along the kinematic chain: drive pulley 9 - driven pulley 10 - shaft 11 - cam 12 - sensible The device 13 and the longitudinal oscillations are transmitted to block 4

The imposition of vibrations on a thin-layer block is carried out in a plane parallel to the inclined elements, with partly through the pipe 15 is discharged from the apparatus cavity to the destination

Thus, even when separating suspensions with sticking solid particles, the inter-shelf space is not cluttered with a solid phase, and continuous operation without stopping is provided

The essential ratios for the proposed method are the range of values for frequencies, amplitudes, and the range for the ratio of the speeds of the slopes of inclined shelves in various opposite directions.

With longitudinal oscillations with a frequency of CO less than 0.5 Hz, the value of At becomes longer than the average residence time of the sediment in the thin-layer channel. This circumstance dramatically reduces the positive effect of superposition of vibrations on the shelves. In most cases, for various industrial precipitates their monolithic structure is not destroyed, in view of which gradual filing of the block and deterioration of efficiency in the performance of the separation process is possible. With longitudinal vibrations with a frequency of CO over

equal to from 0.5 to 75 Hz and amplitude - 30 5 Hz, time времt is short, and to create

up to 1-7 mm, the speed of movement of inclined elements is equal to the ratio

  vB.x, / vn.B, K 4.2,

de v

VC

40

n, c. to

VC,

the average speed of displacement of 35 inclined elements of the thin-layer block in the direction opposite to the direction of removal of the hard component;

average speed of movement of the inclined elements in the direction coinciding with the direction of removal of the hard component

45

As a result of longitudinal oscillations with a frequency of 0.5 to 75 Hz, an amplitude in the range of 1 to 7 mm and a ratio of 2.4 V6lf / vn6i | fЈ 4.2 between the speeds of movement of the block elements, solid particles separated on the shelves from them they enter chamber 14, gradually accumulating with it. As the concentration in the chamber 14 precipitate

fluctuations in the required intensity (to ensure sufficient separation efficiency) it is necessary to increase

fl 7

mm,

that would require a sign

0

five

five

0

five

energy to create oscillations, which leads to large energy losses. In addition, during operation, it is possible to quickly escape from the elements of the block and the cam pair due to large accelerations in it

At vfcK / vn B, 4, the inertial properties of the sediment do not allow overcoming the cohesive force of the particles of the solid phase and disrupting the solidity of the structure for hard-to-remove sediments. The sediment does not descend from the shelves completely. Inter-shelf space is gradually silting.

With VB K / vn V k values of 4.2, the effect of vibrations is dramatically reduced due to the fact that the fit value becomes one order with the residence time of the sediment in the channel and the actual decrease in the equivalent length of the shelves to be divided due to the fact that they move almost in one side.

With longitudinal oscillations with ampl-i, there oscillations of less than 1 mm are small.

the rate of movement of the ointment-shaped sediments along the shelf surfaces at low shear stresses arising in the sediment due to vibration. It is possible to gradually (though not so fast) block silting and separation disturbance with a drop in productivity about

With longitudinal oscillations with am

With slabs of vibrations above 7 mm (total amplitude), the speed of movement of ointment precipitates along the surfaces of the shelves with large shear stresses arising in the sediment from vibration causes blocking of the block does not occur. However, large shear stresses cause an increased entrainment of solids to a clean drain, contaminating it0

Thus, the optimum amplitude range is the range from 1 to 7 mMo.

Example 1 In a thin channel with geometrical parameters - 60 mm thick, 120 mm wide, 600 mm long, an iTiO aqueous suspension with a normal distribution of solid particles by size is supplied: dcp 1, dispersion (j 0.5- Sludge removal shelves are carried out using a known method with a frequency of oscillations of a mechanical vibrator of 25 Hz, their amplitude is 0.6 mm and a value of K 1. At a counter-current performance, the solid phase (heavy component) Q with 0.2 equals the required performance for example reproduction in the pilot industry tion constant situations, the concentration of solids in the clarified liquid

with osa, 92 mg / l of saop 6 ° mg / l. Additional studies show that with sos 60 mg / l maximum performance of QAon is 0.123 m3 / h. " risho

Example 2 In a thin channel, analogously to example 1, a suspension is supplied,. The removal of sediment from the shelves is carried out by the proposed method with a vibration frequency of a mechanical vibrator of 25.0 Hz, an amplitude of 0.6 mm, t "e0 in the ranges of the known method and the K 1 value , 9 "At a capacity of 0, ir) 0.20 me / h" The concentration of the solid phase in the clarified suspension With an axis of 64.9 mg / l, which is slightly higher than the permissible

I6

Example In the finely aloy channel of Example 1, the suspension is fed with the same capacity according to the proposed method, and the sediment is withdrawn when mechanical vibrations of 25 Hz and amplitude 1.0 mm are superimposed on the shelf, at K 30, Qflcx 0.20 corresponds to Soy 59 , 43 mg / l 60 mg / l SdO, | 0

Example 4 “In a thin channel, analogously to example 1, a suspension is fed with the same productivity —RIS4 0.20 m3 / h when applying mechanical vibrations of 75 Hz frequency and 7 mm amplitude to the precipitation shelf, at K 4.15 At the same time, the solid phase concentration in the clarified liquid Sosv is 58.6 mg / l C 60 mg / l Cdop, a Q up to 0.327 m / h

Example 5a In the thin-layer channel of Example 1, the suspension is fed at Q ıex of 0.20 m / h when the mechanical oscillations with a frequency of 100 Hz and an amplitude of 1 mm are imposed on the precipitation shelf. in the range of the known method, at K 6,5 / iax 4,2 "At the same time, the concentration of the solid phase in the clarified liquid SOSB 69.7 mg / l С ftono

The use of the proposed method allows, by increasing the rate of removal of a difficult sediment from the surface of the inclined elements, to increase the separation efficiency of the suspensions or mixtures of two immiscible liquids while maintaining performance

Claims (1)

Invention Formula The method of separating suspensions or mixtures of two immiscible liquids in thin-layer settling tanks, including feeding the initial suspension or mixture, separating a thin-layer block with inclined elements to form a hard-to-draw component, withdrawing separated components, applying vibrations to a thin-layer block in a plane parallel to inclined elements, distinguishes the the fact that, in order to increase the efficiency of separation by accelerating the removal of the difficult component, while increasing the productivity and CO vibration frequency ranges from 0.5 to 75 Hz, the vibration amplitude A 1-7 mm, and the speed of the elements are inclined relation 2.4 v. to VM / vn, B, k 6-4.2 - average speed of movement of inclined elements of a thin-layer block in the direction opposite to the direction of removal- jg /five l jg v eight laziness of the difficult component; l in k - average speed of movement of thin-layer elements in the direction coinciding with the direction of removal of the hard component Condensed Sludge Removal 1 FIG. I VibA Bleaching tap .eight -9 th - / 2 77