RU1836151C - Regulation method for unloading of thickened product from desliming unit and device for its realization - Google Patents

Abstract

Usage: mineral processing in mining and other industries. SUMMARY OF THE INVENTION: continuously measuring a value proportional to the product of the level and density increments of the condensed product in the tight seal area, and stabilizing the measured value by influencing the flow of condensed product. The device comprises a deslamator 1. a rake 2, an unloading cone 3, an adjustable gate valve 4, an unloading pipeline 5. a hydrostatic tube 6, a device 7 for supplying water to a hydrostatic tube, a tube 8 with a calibrated hole, a piezometric tube 9, pressure stabilizers 10 and air flow rate, division sensor, secondary device, 13, setter 14, regulator 15, actuator 16. 1 zp f-ly, 1 ill.

Description

(The invention relates to methods for automatically controlling the operation of deslaimers and can be used in mineral processing in the mining, chemical and other industries to control the work of thickeners, deslaminators, hydroseparators, hydroclassifiers and sedimentation tanks.

The purpose of the invention is to increase economic efficiency by increasing the content of the beneficial component in the condensed product and reducing the loss of magnetite in the drain.

 The deslimator control method is carried out as follows.

The pulp enters the bowl 1 deslamator. The bulk of the water bearing empty porosity enters the drain. Bulk

water carrying waste rock enters the drain. The thickened product through line 5 and an adjustable gate valve 4 enters in direction 17 for further enrichment. During operation of the deslimator, a condensed product is accumulated in its discharge cone 3, the level and density of which depends on the parameters of the process (flow rate, density, particle size distribution of the starting material). As the level of condensed product increases, its density usually grows, but with certain process parameters, the rate of change of the level of condensed product may differ from the rate of change of density. Therefore, the control of the deslamator should be carried out according to a parameter that takes into account both a change in the level and the density is condensed (L

WITH

with

product in the natural compaction zone. As such a parameter, the invention provides a value proportional to the product of increments of the level and density of the condensed product from the minimally controlled level and density, the values of which are selected experimentally.

In the present invention, the measurement of the product of the level and density increments of the condensed product is carried out by a hydrostatic tube 6 connected to the inner cavity of the cylindrical part of the discharge cone 3 at a height hi + h0 from the sump mirror, where h0 is the minimum controlled level of the condensed product with density p0. At the same time, the level of condensed product with a density of ro. In this case, the water level in the hydrostatic tube will be equal to hbo. Based on the dependence of the water level in the hydrostatic tube on the level and density of the pulp (Gudima V.N. Fundamentals of automation of concentration plants. Nedra, N 9, 1979, p. 14), the equation hb /% hi ро + ho р о, (1 )

where hi is the height of the suspension layer above the interface;

pb is the density of water;

p is the density of the suspension above the boundary. section.

With a change in the level and density of the condensed product, the hydrostatic equation will have the form

/ 9b (hbo + Ah) ri2 (h0 + Ah) (po + Do), (2)

where h2 is the suspension level above the interface ;. „

Ah is the increment of the level of condensed product;

Increase in the density of the condensed product;

Ahb is the increment of the water level in the hydrostatic tube.

Subtracting from equation (1), equation (2) and taking into account that Ah hi-ri2, and p b const, we obtain Ahb bp0 + dr + dr ho-dn / o 1 (3).

It can be seen from equation (3) that the water level in the hydrostatic tube is proportional to the product of increments in the level and density of the condensed product. Thus, by continuously measuring the increment of the water level in the hydrostatic tube, we measure the value proportional to the product of the increments of the level and density of the condensed product in the tight seal area and “stabilize this value

5

0

5

0

5

0

5

0

5

thereby affecting the consumption of condensed product from the deslamator.

Example. The level of the suspension layer above the interface, cm, the density corresponding to this level, 1 g / cm3, the minimum controlled level in the condensed product, cm, corresponding to this level. Density, 4 g / cm3, When the quantity and quality of the pulp entering the separator changes mode change and corresponding increments in cm and Up to 0.3 g / cm. Substitute these values in equation (3)

Dp gfo + D) o + To D h0 -D gr 1 20 (1.4 + 0.3) ++ 0.3 80-20 1.1 36 g / cm3.

Lb /% 36 g / cm3; Lp 36 g / cm3:

1 g / cm3 36 cm 360 mm st.

Example 2. The conditions are the same. but cm, a, 1 g / mm3, Dpvr 10 (1.4 + 0.1) + Yuh x1.4-10x x1.1 15 + 14-11 18 g / cm3

DG | b 18: 1 18cm 180mm in st.

PRI me R 3. The conditions in example 2, not Ap 60 cm Dp / o 60 (1-.4 + 0,1} +0.1 80-1.6 60 91.4 g / cm2,

Dp 91., 4 cm 914 mm.article

Example 4. The conditions of example 1, but, a To 0.05 g / cm3

Dypre 10 (1.4+ 0.05) + 0.05 80-10 1 J 14.5+ +, 5 g / cm,.

Ahb 8.5; 1 8.5 cm 85 mm long

PRI me R 5. The conditions in example 1, but Doo 1.2 g / cm3, see Up to 0.2 g / cm, Ahb p 10 (1.2 + 0.2) 40.2-80-101.1 14 + 16 -11 19 g / cm2, 19 cm 190 mm Hg

PRI me R 6. The conditions in example 5, but .5g / cm3, Ahb b 10 (1.5 + 0, + 0.2 80-101, 16-11 22 g / cm2, - 22 cm 220 mm in. Art.

PRI me R 7. The conditions in example 6, but, 7 g / cm3. (1.7 + 0.2) + 0.2 80--101.1 19 + 16-11 24 g / cm2, mm

The results of the various operating modes of the deslimator are tabulated.

An analysis of the results given in the table allows us to conclude that measuring the value proportional to the product of the level and density increments of the condensed product in the tight seal area in the gap between the discharge cone and the rake of the deslamator in the proposed method of controlling the deslamator allows one to practically determine what started violation of the regime of deshlism and timely develop a control action.

So, in examples 2 and 3, with the same density of the condensed product and with the same density increment, 1 g / cm, the changes in the Ah level increments will be 10 and 60 cm, respectively, but the control action in the control system of the desilter operation will be given already at .

In examples 2 and 4, with the same density of the condensed product in the zone of tightening of the jHoro seal and the same increments of the level of the condensed product cm and density increments of the condensed product, To 0.1 and 0.05 / CMJ, respectively, but the control action in the system - to him the operation of the deslamator will be given at hp 0.05 g / cm. .

In examples 5.6 and 7, with the same increments of level and density equal to respectively cm and Јр 0.2 g / cm3, but for different densities of condensed product in the tight seal area, respectively equal to 1 , 2; 1.5 and 1.7 g / cm3, the governing influence in the control system of the deslamer operation will also be given when the density changes.

Thus, as can be seen from examples -7, the inventive method provides control of the process of deflamation at different operating modes of the deslamator.

Fig. 1 shows a diagram of a device for controlling the operation of a deslaimer that implements this method. The device contains a cup of a deslamator 1 with a rake 2. a discharge cone 3, an adjustable valve 4 on the discharge pipe 5 of the condensed product, a hydrostatic plug 6 located on the outside of the deslamator, the lower end of which is connected to the internal cavity of the discharge cone, a device for supplying water to the hydrostatic tube 6, made of a stand vessel 7 with a constant overflow of smoke and a tube 8 with a calibrated hole, a piezometric tube 9, an air pressure stabilizer U, an air flow stabilizer 11, a pressure gauge 12 and air in the piezometric tube 9, the secondary device 13, the adjuster. 14 the product of the increments of the level and density, the relay 15 and the actuator 16. The device operates as follows. Water enters the pressure vessel 7 with a constant overflow and through the tube 8 s

to;

tube b, the water from which enters into the deslamer at level 18. The flow rate of water from hydrostatic tube 6 to dehumidifier 1 is so small compared to the volume of the dehumidifier that it can be neglected.

At level 19 of the condensed product h with a density of PO in the hydrostatic tube 6, the water level of the pio will be established along line 20 Yu. The piezometric tube 9 is placed in the hydrostatic tube 6 so that its lower end is located at the level of line 20 V, the piezometric tube 9 is supplied with compressed air current consumption from

15 pressure stabilizers 10 and flow rate 11

while in the piezometric tube .9 not

backpressure occurs and at the exit

pressure sensor 12 no signal.

With an increase in the level of condensed

20 of the product along line 21 by Ah and a change in the density of the condensed product by & r, the water level in the hydrostatic tube 6 will increase to line 22 by the value of Ahb, proportional to the product of 25 increments of the level and density of the condensed product in the tightened compaction zone. In this case, air backpressure arises in the piezometric tube 9, which enters the input of pressure sensor 12, at the output of which a signal is proportional to the product of increments of level Ah and density Lp of the condensed product in the tight seal zone. This signal is fed to the input of the secondary device 13 and to the second input 23 of the controller 15, to the first input 2.4 of which a signal is supplied from the sensor 14 - a value proportional to the product of the increments of the level and density

40 of the condensed product, If the value is proportional to the product of the increments of the level and density of the condensed product from the predetermined one, the regulator 15c using the actuator 16i

45 of the adjustable gate valve 4 changes the flow rate of the condensed product in the direction 17 until a value proportional to the product of the increments of the level and density of the condensed product becomes equal to the specified

The value proportional to the product of the increments of the level and density of the condensed product obtained in

the liberated hole is fed into the hydraulically controlled tube 5, the water from which enters the deflator at level 18. The water flow from the hydrostatic tube 6 to deslamer 1 is so small compared to the volume of the deflator that it can be neglected.

At the level 19 of the condensed product h0 with a density of PO in the hydrostatic tube 6, the pio water level is established along line 20. The piezometric tube 9 is placed in the hydrostatic tube 6 so that its lower end is located at the level of line 20. Compressed air is supplied to the piezometric tube 9 from a constant current consumption from

pressure stabilizers 10 and flow rate 11.

while in the piezometric tube .9 not

backpressure occurs and at the exit

pressure sensor 12 no signal.

With an increase in the level of condensed

of the product along line 21 by the value of Ah and a change in the density of the condensed product by the value of & r, the water level in the hydrostatic tube 6 will increase to line 22 by the value of Ahb proportional to the product of the increments in the level and density of the condensed product in the tight seal zone. At the same time, air backpressure arises in the piezometric tube 9, which enters the input of the pressure sensor 12, at the output of which a signal is proportional to the product of the increments of the level Ah and the density Lp of the condensed product in the tight seal zone. This signal is fed to the input of the secondary device 13 and to the second input 23 of the controller 15, to the first input 2.4 of which a signal is supplied from the sensor 14 - a value proportional to the product of the level and density increments

thickened product, If the value is proportional to the product of the increments of the level and density of the thickened product from the set, the regulator 15 using the actuator 16 and

adjustable valve 4 changes the flow rate of the condensed product in the direction 17 until a value proportional to the product of the increments in the level and density of the condensed product is equal to the specified

The value proportional to the product of the increments of the level and density of the condensed product obtained in

automatic control result

static tube 6. The presence of a constant overflow and a calibrated hole for the tube 8 ensures a constant flow of water from the pressure vessel 7 in the hydroprocessing unit, is recorded in the diagram of the secondary device 13 and is used to monitor the operation of the unit and its control device.

Placing the hydrostatic tube outside the deslamator and communicating its lower end with the deslamator cavity between its unloading part and the rake allows you to timely detect minor changes in the level and density of the condensed product in the tight seal area, thereby controlling the initial phase of the appearance of the deflation mode and in a timely manner to develop a proactive control action, thereby minimizing overshoot and regulation time, which improves the quality of regulation ani of the process of deception.

Placing the lower end of the piezometric tube at the water level in the hydrostatic tube, corresponding to the product of minimally controlled values of the condensed product level and density in the tight seal area, allows us to exclude the constant components of the level and density from the measurement and to measure only in increments This provides an increase in the accuracy of measurement and, accordingly, the accuracy of regulation of the process of recovery.

Controlling the operation of the deslaimer by stabilizing a value proportional to the product of the increments in the level and density of the condensed product by changing its flow rate allows us to increase the economic efficiency of the dehumidifier by increasing the content of the useful component in the condensed product and reducing the loss of magnetite in the drain.

Claims (2)

1. A method of controlling the discharge of condensed product from a deslamer, including measuring the density of the discharge thickened product in the discharge neck of the deslamator and a change in the flow cross section of the outlet of the deslimator, characterized in that a value proportional to the product of the increments of the level and density of the thickened product in the gap between the discharge cone and the rake of the deslaminator is determined, the optimal value of this product is determined and compared between them and if the value of the product of the increments in the level and density of the condensed product is greater than the specified value, the change in the passage cross section of the condensed product is corrected product in the direction of increase, and with the value of the product of increments less than the specified - in the direction of decrease. 2. A device for controlling the discharge of condensed product containing a deslimator, on. the discharge pipe of which is equipped with an adjustable valve, a hydrostatic tube, a water supply device, a controller connected to the first input of the controller, the output of which is connected to an adjustable valve through an actuator, and a secondary device, which is equipped with pressure stabilizers and air flow, a pressure sensor, a piezometric tube that is installed in the hydrostatic tube, and a pressure sensor. mounted on a piezometric tube, the upper end of which It is single with flow pressure stabilizers connected in series, the output of the pressure sensor is connected to the second input of the regulator and to the input of the secondary device, and the hydrostatic pipe is placed outside the separator and is connected by hydrostatic channels with a de-separator between its discharge cone and the rake. WATER CLEAN Overflow ZEROSHOG DESIGNERS COMPRESSED AIR