CN212791412U - Flotation pulp steam heating device - Google Patents

Abstract

The utility model relates to a flotation pulp steam heating apparatus, include the flotation unit of constituteing by a plurality of flotation cells, set up the central impeller rabbling mechanism in every flotation cell, ore pulp heating system and temperature control system, a serial communication port, ore pulp heating system include steam generator, steam main line, steam branch pipeline, steam nozzle and solenoid valve, still be equipped with temperature sensor on the lateral wall in the flotation cell body, be equipped with the solenoid valve at the inlet end of steam main line, temperature sensor and solenoid valve link to each other with the temperature control system electrical property. Because the utility model discloses built-in ore pulp heating system in the flotation device cell body, and the cavity resistance expansion pipe of steam nozzle adoption area multirow bleeder vent, make steam and the flotation device cell body of heating in wait to heat the contact between the ore pulp more abundant, mix more evenly, the effectual steam that has improved and wait to heat the homogeneous mixing degree between the ore pulp to the effectual time of heating that has shortened has reached energy-conserving purpose.

Description

Flotation pulp steam heating device

Technical Field

The utility model relates to a mine flotation equipment technical field specifically is a flotation pulp steam heating apparatus.

Background

In the flotation process, the influence of the temperature of the ore pulp on the efficiency and flotation indexes of the flotation machine directly exists.

The temperature of the ore pulp plays an important role in the flotation operation of the flotation machine, and the heating can accelerate the molecular thermal motion, so the heating has various influences on minerals. For example, the dispersion, dissolution, hydrolysis and decomposition of the medicament can be accelerated, and the attachment and mineralization of minerals on the surface of the flotation foam can be promoted. Some flotation agents require a certain temperature to dissolve and perform their effect. For example, when some flotation agents such as oleic acid, amines and the like which are difficult to dissolve and the solubility of which changes along with the change of the temperature of the pulp are used, the increase of the temperature of the pulp increases the flotation effect and the solubility of the flotation agents in water. For example, when the fatty acid flotation agent is used for flotation of iron ore, the temperature of ore pulp is increased, the recovery rate of metal is improved, and the dosage of the flotation agent is saved.

Therefore, the pulp temperature is an important factor affecting the flotation process. Many practices prove that the flotation speed can be increased and higher flotation indexes can be obtained by increasing the temperature of the ore pulp. However, the heating of the ore pulp consumes a large amount of heat energy, and corresponding heating facilities are required to be configured.

At present, ore pulp heating in flotation production of various domestic ore dressing plants is divided into electric heating and water heating, ore pulp temperature control is generally manual adjustment, and occasionally an electric interlocking mode is used for controlling a heat source switch. The electric heating mode is that a plurality of electric heating rods are inserted into the heating ore pulp stirring tank, and the temperature can be controlled through the thermoelectric interlocking of the temperature controllers, so that the heating speed is high and uniform, and the defects that the regulation and control of the ore pulp temperature have time delay, the ore pulp temperature is large in fluctuation and small in fluctuation, the flotation index is easy to fluctuate, discontinuous unqualified concentrate is generated, the power consumption is large, the cost control is not facilitated, and potential safety hazards such as electric leakage exist; the water heating mode is to supplement hot water in the flotation process, because too many water supplementing points are produced in the flotation process, automatic control and adjustment cannot be realized, and only valves of all the water supplementing points can be manually operated to control the temperature of ore pulp.

Also have the mode that adopts steam to heat, let in steam promptly and carry out the ore pulp heating in the ore pulp stirred tank, carry out temperature control through adjusting steam conduit valve opening, current steam heats directly to let in flotation cell or agitator with a steam conduit and lead to the vapour to heat the ore pulp, and single steam conduit not only heats very inhomogeneous, heats for it is often unsatisfactory to heat the effect, but also leads to the fact the waste scheduling problem of the high and low fluctuation of ore pulp temperature or steam heat source easily. In addition, due to the characteristics of the equipment with compact structure of the flotation machine, the shape of the heating device is not suitable for the flotation machine, the heating device is difficult to be used in a matching way and difficult to be transformed, and especially the effective volume of the flotation machine is lost due to the occupation of the internal space of the flotation machine, even the serious result of insufficient flotation time is caused.

Disclosure of Invention

The utility model aims at overcoming prior art's not enough, provide one kind and enable steam and the flotation machine cell body of heating in wait to heat the contact between the ore pulp more abundant, mix more evenly, the effectual steam that has improved and wait to heat the homogeneous mixing degree between the ore pulp to the effectual flotation ore pulp steam heating apparatus who shortens the time of heating.

The utility model is realized by the following technical proposal.

The utility model discloses a flotation pulp steam heating device, which comprises a flotation unit consisting of a plurality of flotation tanks, a central impeller stirring mechanism arranged in each flotation tank, a pulp heating system and a temperature control system, and is characterized in that the pulp heating system comprises a steam generator, a main steam pipeline, a branch steam pipeline, a plurality of steam nozzles and a solenoid valve, wherein the air inlet end of the main steam pipeline is connected with the steam generator, the air outlet end of the main steam pipeline is respectively connected with the branch steam pipeline,

the steam branch pipelines are arranged in a gap between the tank body of each flotation tank and the central impeller stirring mechanism and are sequentially arranged along the axial direction of the flotation unit, a plurality of steam nozzles are vertically and uniformly arranged at the lower part of each steam branch pipeline and are inserted into the flotation tank, and the steam branch pipelines are lower than the flotation liquid level;

the side wall in the cell body of the flotation machine is also provided with a temperature sensor, the air inlet end of the main steam pipeline is provided with an electromagnetic valve, the output end of the temperature sensor is connected with the input end of a temperature control system, and the input end and the output end of the electromagnetic valve are respectively connected with the input end and the output end of the temperature control system.

Furthermore, each steam nozzle consists of an air guide pipe connected with the steam branch pipe and a hollow resistance expansion pipe connected with the air guide pipe, wherein a plurality of rows of air holes are formed in the pipe wall of the hollow resistance expansion pipe, and an exhaust hole is formed in the bottom of the hollow resistance expansion pipe; the pitch of each row of air holes is 40 mm.

Furthermore, the number of the steam spray heads is 3-5.

Further, the diameter of the hollow resistant expanding tube is 2 times of that of the airway tube.

Furthermore, the steam branch pipeline is arranged 100mm lower than the flotation liquid level.

The utility model has the advantages that:

because the utility model discloses built-in ore pulp heating system in the flotation device cell body, and steam nozzle adopts the cavity resistance expansion pipe of taking multirow bleeder vent, make steam just discharge from the multirow bleeder vent and ore pulp mix after the intraductal dispersion buffering of cavity resistance expansion, make steam and the flotation device cell body of heating in wait to heat the contact between the ore pulp more abundant, it is more even to mix, the effectual steam that has improved and the homogeneous mixing degree of waiting to heat between the ore pulp, thereby the effectual time of heating that has shortened, energy-conserving purpose has been reached.

Because the utility model discloses a steam heating apparatus and temperature control system are connected, have improved flotation ore pulp steam heating apparatus's reliability effectively, and equipment maintenance is simple, structural design is reasonable, and is with low costs, long service life to reduced the degree of difficulty of dismantling the maintenance, simultaneously, heating apparatus compact structure has solved the flotation machine and has joined in marriage the difficulty of rebuilding, has avoided the effective volumetric waste of flotation machine.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is an enlarged view of the steam spray head.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1-4, the steam heating device for flotation pulp of the present invention comprises a flotation unit 1 consisting of a plurality of flotation cells, a central impeller stirring mechanism 2 disposed in each flotation cell, a pulp heating system and a temperature control system, wherein the pulp heating system comprises a steam generator 5, a main steam pipeline 4, a branch steam pipeline 3, a plurality of steam nozzles and a solenoid valve 9, the inlet end of the main steam pipeline 4 is connected to the steam generator 5, the outlet end of the main steam pipeline 4 is connected to the branch steam pipeline 3,

the steam branch pipelines 3 are arranged in a gap between the tank body of each flotation tank and the central impeller stirring mechanism 2 and are sequentially arranged along the axial direction of the flotation unit, a plurality of steam nozzles are vertically and uniformly arranged at the lower part of each steam branch pipeline 3 and are inserted into the flotation tank, and the steam branch pipelines 3 are arranged below the flotation liquid level by 100 mm;

the number of the steam nozzles is 3-5, and three steam nozzles are arranged in each flotation machine tank 1.

Each steam nozzle of the utility model consists of an air duct 6 connected with the steam branch pipe 3 and a hollow resistance expansion pipe 7 connected with the air duct 6, wherein, a plurality of rows of air holes 71 are arranged on the pipe wall of the hollow resistance expansion pipe 7, and an exhaust hole 72 is arranged at the bottom of the hollow resistance expansion pipe 7; the pitch of each row of the air holes 71 is 40 mm.

The diameter of the hollow resistance expanding tube 7 is 2 times of the diameter of the air duct. Effectively eliminating noise and air impact, being beneficial to improving the field environment and greatly reducing the vibration. Meanwhile, the rotary slurry flow reduces the scaling phenomenon of the flotation agent of the system to the maximum extent, and the heat exchange efficiency of the system cannot be reduced due to the scaling defect.

The utility model discloses still be equipped with temperature sensor 8 on the lateral wall in the flotation device cell body, be equipped with solenoid valve 9 at the inlet end of steam main line, temperature sensor 8's output link to each other with temperature control system's input, solenoid valve 9's input and output link to each other with temperature control system's input and output respectively. The structure of the temperature control system is the prior art and will not be described herein. The temperature value collected and returned by the temperature sensor is compared with the initial temperature set value of the temperature control system, and when the returned temperature value is inconsistent with the initial temperature set value, the electromagnetic valve 9 is controlled to linearly regulate the opening or on/off, so that the opening accuracy of the electromagnetic valve 9 is greatly improved, the ore pulp temperature is always controlled in the optimal flotation temperature range, and the yield and the qualified rate of the ore concentrate are ensured.

The specific heating process is as follows:

when the temperature of ore pulp is lower than 20 ℃, under the control of a temperature sensor 8 and an electromagnetic valve 9 in a temperature control system, heat source steam generated by a steam generator 5 is fed into a steam branch pipeline 3 through a main steam pipeline 4 and then enters a steam nozzle through each air duct 6, the steam is ejected out from an air hole 71 and an exhaust hole 72 of a hollow resistance expansion pipe 7 of the steam nozzle at a high speed, kinetic energy of the steam is absorbed by the ore pulp, and the heat exchange of the steam and the ore pulp is completed in a flotation machine tank body 1 by utilizing the limited mixing and internal absorption processes of the steam and the ore pulp, so that the steam is completely converted into hot water after passing through the air hole 71 and the exhaust. In addition, the impeller stirring mechanism 2 pushes the ore pulp to flow along the tangential direction of the edge of the hollow resistance expansion pipe 7, the ore pulp contacts with the outer wall of the shell at a larger angular speed and rotates under the obstruction of the shell, the rotating ore pulp flows disperse the steam into a large number of micro gas-water unit combinations, and the formation of the micro gas-water unit combinations can better absorb steam heat energy and reduce the scaling phenomenon of a flotation reagent of the system to the maximum extent. Meanwhile, the hollow resistant expansion pipe 7 also has the sound absorption and silencing function, the steam passing through the air holes 71 is subjected to pressure reduction and flow reduction in the hollow resistant expansion pipe 7, the sound power of each frequency doubling band is reduced, strong vibration and noise generated by free mixing of the steam and ore pulp are avoided, stable output of the steam is ensured, and heat exchange of steam-flotation ore pulp can be efficiently completed.

Claims (6)

1. A steam heating device for flotation pulp comprises a flotation unit consisting of a plurality of flotation tanks, a central impeller stirring mechanism arranged in each flotation tank, a pulp heating system and a temperature control system, and is characterized in that the pulp heating system comprises a steam generator, a main steam pipeline, a branch steam pipeline, a plurality of steam nozzles and electromagnetic valves, the air inlet end of the main steam pipeline is connected with the steam generator, the air outlet end of the main steam pipeline is respectively connected with the branch steam pipeline,

the steam branch pipelines are arranged in a gap between the tank body of each flotation tank and the central impeller stirring mechanism and are sequentially arranged along the axial direction of the flotation unit, the plurality of steam nozzles are vertically and uniformly arranged at the lower part of each steam branch pipeline and are inserted into the flotation tank, and the steam branch pipelines are lower than the flotation liquid level;

the side wall in the cell body of the flotation machine is also provided with a temperature sensor, the air inlet end of the main steam pipeline is provided with an electromagnetic valve, the output end of the temperature sensor is connected with the input end of a temperature control system, and the input end and the output end of the electromagnetic valve are respectively connected with the input end and the output end of the temperature control system.

2. The flotation pulp steam heating device according to claim 1, wherein each steam nozzle is composed of a gas guide pipe connected with a steam branch pipe and a hollow resistant expansion pipe connected with the gas guide pipe, a plurality of rows of air holes are arranged on the pipe wall of the hollow resistant expansion pipe, and an exhaust hole is arranged at the bottom of the hollow resistant expansion pipe.

3. The flotation pulp steam heating device according to claim 1, wherein the number of the steam nozzles is 3-5.

4. The flotation pulp steam warming device according to claim 2, wherein the hollow resistant expansion pipe has a diameter 2 times the diameter of the air duct.

5. The flotation pulp steam heating device according to claim 2, wherein the plurality of rows of air holes have a pitch of 40 mm.

6. The flotation pulp steam heating device according to claim 1, wherein the steam branch line is positioned 100mm below the flotation liquid level.

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