RU26446U1 - DOSING DEVICE - Google Patents

Description

Metering device

The utility model relates to the field of ore dressing and can be used for dosing contaminated and crystallizing solutions, for example, lime.

To control the processes of ore dressing, a supersaturated solution of slaked lime, the so-called. “Milk of lime, in which the undissolved working particles of slaked lime are in suspension, in addition, particles of sand, clay and unbaked lime are in a significant amount in the solution.

There are no effective means of separating undissolved hydrated lime particles from harmful solid impurities in the process of ore dressing.

With continuous expiration of the dosed solutions, especially at low costs, the dispensing orifice (or slot) must be reduced to a few millimeters, in which case, as a rule, it clogs almost instantly. Therefore, for reliable operation of the dispensing device, the dispenser must be insensitive to the real contamination of the solutions.

For dispensing contaminated and crystallizing solutions, predominantly devices with dispensers of a discrete type are used.

IPCT & their 4/02

for example, bucket, skip, valve, etc., 1, the discharge holes in which can be quite large.

In addition, the reliability of the dosing system depends not only on the reliable operation of the dispenser, but also on the condition of the reagent pipeline through which the solution is supplied from the dispenser to the process equipment. Portions of the lime solution are poured into the reagent line, through which they move by gravity. The reagent line has free air access, especially during breaks between doses passing through it or when the dosing device is stopped. Upon contact of the lime solution in the reagent piping with air, an insoluble precipitate is formed - calcium carbonate, which crystallizes on the walls of the pipeline and cements the sediment of solid particles. Thus, during gravity transport of the reagent, the reagent line is intensively overgrown. To clean it using percussion and scraper tools, it takes several hours for several people to work, since the length of the reagent pipe can reach 50 meters or more. Therefore, as a rule, the diameter of the reagent pipe is chosen with a large margin, thereby increasing the service life of the reagent pipe and the reliability of the metering device.

The closest in technical dryness, dryness and the achieved result to the claimed is a device for dispensing lime, including a dispenser and a ring reagent line, which passes over all points of dosing 2. On reagent line, filling it

completely, continuously circulating a solution of lime. At the metering points on the reagent pipe, nozzles are installed, each of which is equipped with a rubber hose, clamped by the actuator, which controls the flow rate of the solution.

The location of the outlet pipe at an angle of 45-60 ° to the horizontal plane does not prevent clogging of the metering device, since solid particles cannot endlessly accumulate in the circulation system. They can only go through the dispenser.

In addition, the installation of an annular reagent pipeline over all metering points located randomly and at different elevations along the entire flotation front presents a certain difficulty. The need to ensure a certain slope in all sections of the reagent pipe, preventing the accumulation of sediment of solid particles, also complicates the design of the metering device.

If it is necessary to eliminate blockages and replace hoses, it will be necessary to stop the entire circulation system and all dispensers, respectively, which is unacceptable, since the enrichment process is continuous.

The utility model is based on the task of increasing the reliability of the metering device by reducing reagent pipelines overgrowing with solution particles, while simplifying the design of the device and the washing process.

The problem is solved in that a device for dispensing predominantly contaminated and crystalline solutions, for example, lime, including a dispenser, a flow box and a reagent pipe, located obliquely, equipped with a water seal mounted on the lower end of the reagent pipe, and a rinse water supply fitting installed at the junction of the reagent pipe with a consumable nozzle of the dispenser, which is hermetically connected to the upper end of the reagent line.

The dispensing device also includes a perforated cup mounted inside the flow box, which is a continuation of the dispensing nozzle of the dispenser.

The supply of the metering device with a water lock mounted on the lower end of the reagent pipe and a flushing water supply fitting installed at the junction of the reagent pipe with the consumable nozzle, which is hermetically connected to the upper end of the reagent pipe, made it possible to exclude air from entering the reagent pipe and increase the reliability of the device, since it does not form insoluble precipitate - calcium carbonate, which crystallizes on the walls of the reagent pipe and cements the sediment of solid particles.

All this allowed to reduce the diameter of the reagent line. The small diameter of the reagent pipe facilitates flushing it with a small portion of water, reaching a head close to the pressure in the water supply. Such a reagent line is easier to install and replace, since the pipes of small diameter are plastic and are delivered in bays.

In addition, the proposed implementation of the device allowed for efficient washing of the reagent line without stopping the dosing process. To do this, water is supplied through a fitting cut into the place of the reagent piping tightly to the supply nozzle, creating an excess pressure in it close to the pressure in the water supply, the beginning of the inclined reagent piping is blocked by the metering valve, and a water seal is fixed at its end.

The drawing shows a section of the proposed device for dispensing

The device for dispensing lime includes a dispenser 1 with a consumable nozzle 2. The dispenser 1 is installed in the flow box 3. The device also includes a reagent line 4, the upper end of which is hermetically connected to the consumable nozzle 2, and a water seal 5 is mounted on its lower end, The metering housing 1 is made in in the form of a perforated glass 6, immersed in a circulating stream of lime. The perforated cup 6 goes into the consumable nozzle 2. At the same time, the size of the perforated holes of the cup 6 does not exceed the size of the opening of the consumable nozzle 2. Inside the perforated cup 6 there is a rod 7 overlapping the entrance to the nozzles 2. In the upper part of the cup 6 there is a pneumatic actuator 8 that moves the rod 7 along the vertical axis of the glass 6. The device operates as follows: In the initial position

the rod 7 blocks the entrance to the consumable nozzle 2. The program of operation of the actuator 8 is turned on, which opens and closes with the rod 7 the flow of lime solution through the consumable nozzle 2 into the reagent line 4. The dispenser performance is determined by the frequency and duration of the actuator 8. The washing frequency of the reagent line 4 depends on the quality lime solution.

On average, once per hour with the initial lowered position of the rod 7, the supply to the reagent line 4 through the nozzle 9 of the washing water is switched on, for example, for 30 seconds. 10 seconds before the end of washing, the rod 7 rises, and water under pressure begins to flow into the flow box 3 through the nozzle 2 and the perforation holes of the glass 6, while washing their surfaces.

The size of the perforation holes of the glass 6 does not exceed the size of the hole of the consumable nozzle 2, which protects the latter from getting into it and the reagent pipe 4 large objects such as wood chips, film, metal scrap, etc.

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Used Literature

1.G. M, Kovin and G.N., Mashevsky, Systems of automatic control and process control of flotation plants. Moscow, "Nedra, 1981 p. 87-93.

2.O.V., Laubgan, T.O. Nichiporenko, R. X. Abdullin, R.I. Ablatipov, T.I. Vasilchenko. Experience in introducing automatic lime feed systems at the Kentau Concentrator. Bulletin “Ore dressing No. 3, 1989, p. 45-47.

Claims (2)

1. A device for dispensing, mainly contaminated and crystalline solutions, for example, lime, comprising a dispenser with a drive and a consumable nozzle mounted in a flow box, and a reagent pipe located obliquely, characterized in that it is equipped with a water seal mounted on the lower end of the reagent pipe, and a rinse water supply fitting installed at the junction of the reagent pipe with the consumable nozzle, which is hermetically connected to the upper end of the reagent pipe. 2. The device according to claim 1, characterized in that the body of the dispenser is made in the form of a perforated cup turning into a consumable nozzle of the dispenser.