CN108672105B - Energy-saving iron concentrate product index adjustable direct flotation system - Google Patents

Energy-saving iron concentrate product index adjustable direct flotation system Download PDF

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CN108672105B
CN108672105B CN201810862239.8A CN201810862239A CN108672105B CN 108672105 B CN108672105 B CN 108672105B CN 201810862239 A CN201810862239 A CN 201810862239A CN 108672105 B CN108672105 B CN 108672105B
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flotation
concentrate
fine
cell
discharge pipe
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CN108672105A (en
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李国洲
杨海龙
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MCC North Dalian Engineering Technology Co Ltd
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MCC North Dalian Engineering Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/14Flotation machines
    • B03D1/1406Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00Specified materials treated by the flotation agents; specified applications
    • B03D2203/02Ores
    • B03D2203/04Non-sulfide ores

Abstract

The invention relates to an energy-saving direct flotation system with adjustable iron concentrate product indexes, which comprises a flotation agent stirring system, a rough flotation operation system, a scavenging flotation operation system and a fine flotation operation system, wherein the flotation agent stirring system adopts five flotation agent stirring tanks which are sequentially connected, the rough flotation operation system consists of a section of rough flotation operation tank, the scavenging flotation operation system consists of four continuous sections of fine flotation operation tank groups which are communicated with each other, the fine flotation operation tank system also consists of four continuous sections of fine flotation operation tank groups which are communicated with each other, and a concentrate bypass main pipeline is arranged at the lower part of the fine flotation operation tank. According to the invention, the subsequent concentration operation of the section of flotation operation can be cut off by closing the gate valve on any section of concentrate discharge pipe A in the concentrate flotation operation and opening the gate valve at the discharge port of the concentrate bypass main pipeline, so that the concentrate grade and the recovery rate of the flotation product are adjusted, the flotation operation with adjustable ore grade is realized, and different market demands are met.

Description

Energy-saving iron concentrate product index adjustable direct flotation system
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to an energy-saving type direct flotation system with adjustable iron concentrate product indexes.
Background
In mineral separation, most of the micro-fine particle minerals can be separated by flotation due to the difference between the hydrophilicity and the hydrophobicity of useful minerals and gangue minerals. The flotation is divided into direct flotation and reverse flotation, wherein the direct flotation means that the useful minerals are hydrophobic, the gangue is hydrophilic, the useful minerals are carried out by foams and enter foam products to be discharged from an upper foam layer, and the hydrophilic gangue is discharged from a lower pulp layer. Currently, in order to expand the sorting difference during flotation and make the difference between hydrophilic substances and hydrophobic substances more obvious, most of the flotation needs to add inhibitors and activators; in order to collect the target mineral, a collecting agent and a foaming agent are added; in order to sufficiently bind the drug to the mineral, a dispersant may be added; in addition, the common medicament can play the best role only under certain acidic or alkaline environment, and a PH value regulator is also required to be added; in most of the current flotation, 3 stirring tanks are generally arranged before roughing, wherein the first stirring tank is added with a pH value regulator, the second stirring tank is added with an inhibitor and an activating agent, and the third stirring tank is added with a foaming agent and a collecting agent. In the mode, when different medicaments are added into one stirring tank at the same time, the medicaments react with each other, and the effect that one medicament is fully acted with minerals and then combined with another medicament cannot be realized, so that the adhesion effect of the medicaments is poor, the flotation effect is reduced, and the medicament dosage is increased. In addition, in many current direct flotation operations, in order to fully combine the chemical and the minerals, a certain flotation temperature, generally 30 ℃ to 35 ℃, needs to be maintained, and the temperature of general ore pulp is mostly 5 ℃ to 20 ℃, so that the ore pulp needs to be heated, and a large amount of energy is consumed. The current flotation generally adopts three ore feeding stirring tanks for heating before flotation, and the heating mode often has the defects of incapability of adjusting the heat supply or small adjusting room and large energy consumption. In the current direct flotation operation, only the final concentrate is obtained in the final stage of flotation concentration operation, and only the concentrate with fixed quality can be obtained. In addition, most of the current flotation operations are that the concentrate in the lower-stage scavenging is returned to the upper-stage scavenging, and the tailings in the lower-stage concentration is returned to the upper-stage concentration, so that the yield of the final concentrate is low. Therefore, a multi-stage direct flotation process which can realize a multi-product scheme, can obviously improve the yield and is energy-saving is needed to be developed.
Disclosure of Invention
The invention aims to provide an energy-saving type direct flotation system with adjustable iron concentrate product indexes, which can select iron concentrates of various grades in one direct flotation process, can obviously improve the yield and is energy-saving.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a multi-product direct flotation system, which comprises a flotation agent stirring system, a rough flotation operation system, a sweeping flotation operation system and a fine flotation operation system, and is characterized in that:
the flotation reagent stirring system adopts five flotation reagent stirring tanks, a first PH regulator stirring tank, a second dispersant stirring tank, a third useful mineral activating agent stirring tank, a fourth gangue mineral inhibitor stirring tank, a fifth useful mineral collecting agent and foaming agent stirring tank which are sequentially connected, spiral steam pipes are arranged on the five stirring tanks along the inner side tank walls, the inlet of each steam pipe of each stirring tank is connected with the same steam header pipe, and a gate valve is arranged at the inlet of each stirring tank;
the rough flotation operation system consists of a rough flotation operation cell bank, the sweeping flotation operation system consists of four continuous sweeping flotation operation cell banks which are communicated with each other, the fine flotation operation system also consists of four continuous fine flotation operation cell banks which are communicated with each other, and a concentrate bypass main pipeline is arranged at the lower part of the fine flotation operation system;
each section of flotation operation cell group consists of three flotation operation cells which are mutually connected through an intermediate cell, the lower part of each intermediate cell of the rough flotation operation cell group and the sweeping flotation operation cell group is provided with an ore discharge port, one side of the lower part of the intermediate cell is connected with the previous flotation operation cell through a tailing ore discharge pipe, and the other side of the lower part of the intermediate cell is connected with the next flotation operation cell through an L-shaped connecting pipe;
the bottom of each intermediate box of the fine flotation operation cell group is also provided with a mineral discharge port, one side of the lower part of the intermediate box is connected with the previous fine flotation operation cell through a tailing mineral discharge pipe, the other side of the lower part of the intermediate box is connected with the next fine flotation operation cell through an L-shaped connecting pipe, and each intermediate box is internally provided with a rubber plug valve.
The rough flotation operation cell group comprises three operation cells which are mutually connected through an intermediate cell, a concentrate collecting tank arranged on the upper portion of each operation cell, a rough flotation concentrate ore discharge pipe connected with the concentrate collecting tank, and a rough flotation tailing ore discharge port and a rough flotation tailing ore discharge pipe arranged on the lower portion of each operation cell, wherein the rough flotation concentrate ore discharge pipe is communicated with the first fine flotation operation cell as an ore feeding pipe of the first fine flotation operation, and the rough flotation tailing ore discharge pipe of the last rough flotation cell of the first rough flotation operation is communicated with a sweeping flotation operation system through the intermediate cell.
The continuous four-section sweeping flotation operation cell bank comprises a primary sweeping flotation operation cell bank, a secondary sweeping flotation operation cell bank, a tertiary sweeping flotation cell bank and a quaternary sweeping flotation cell bank which are connected in sequence, wherein each sweeping flotation operation cell bank also comprises three flotation operation cells, a concentrate collecting tank and a sweeping flotation concentrate discharge pipe connected with the concentrate collecting tank are arranged at the upper part of each flotation operation cell, a concentrate discharge pipe of the primary sweeping flotation operation cell and a concentrate discharge pipe of the secondary sweeping flotation operation cell are connected with one section of coarse flotation operation cell bank through a mineral conveying pipe, a concentrate discharge pipe of the tertiary sweeping flotation operation cell is connected with the primary sweeping flotation operation cell bank through a mineral conveying pipe, a concentrate discharge pipe of the quaternary sweeping flotation operation cell is connected with the secondary sweeping operation cell bank through a mineral conveying pipe, a tailing discharge pipe is arranged at the lower part of each sweeping flotation operation cell, and a tailing discharge pipe at the lower part of the previous sweeping flotation operation cell is connected with the next sweeping operation cell through an intermediate box, and the tailing discharge pipe at the lower part of the last sweeping flotation operation tank is connected with a tailing pond.
The continuous four-section fine flotation operation cell group comprises a first section fine flotation operation cell, a second section fine flotation operation cell, a third section fine flotation cell and a four section fine flotation cell which are connected in sequence, each section of fine flotation operation cell consists of three fine flotation operation cells, a concentrate collecting tank is arranged at the upper part of each section of three fine flotation operation cells, a fine flotation concentrate ore discharge pipe and a fine flotation tailing discharge port are connected with the concentrate collecting tank, the fine flotation concentrate ore discharge pipe consists of a fine flotation concentrate ore discharge pipe A and a fine flotation concentrate ore discharge pipe B, each section of fine flotation concentrate ore discharge pipe A is used as an ore discharge pipe with different grades and is connected with a concentrate bypass main pipeline, a gate valve is arranged on each fine flotation concentrate ore discharge pipe A and each fine flotation concentrate ore discharge pipe B, and the first section of fine flotation tailing discharge pipe and the second section of fine flotation tailing discharge pipe are communicated with a rough flotation operation system through tailing conveying pipes, the three-section fine flotation tailing discharge pipe is connected with the first-section fine flotation cell group through a tailing conveying pipe, the four-section fine flotation tailing discharge pipe is connected with the second-section fine flotation cell group through a tailing conveying pipe, the first-section fine flotation concentrate discharge pipe B is communicated with the second-section fine flotation cell group through a concentrate conveying pipe, the second-section fine flotation concentrate discharge pipe B is communicated with the third-section fine flotation cell group through a concentrate conveying pipe, the three-section fine flotation concentrate discharge pipe B is communicated with the four-section fine flotation cell group through a concentrate conveying pipe, and the four-section fine flotation concentrate discharge pipe is a final concentrate discharge pipe A and is connected with a concentrate bypass main pipeline.
And temperature sensors are arranged on each fine flotation operation tank and each sweeping flotation operation tank.
The invention has the advantages that:
1) the invention adopts five stirring tanks which are connected in sequence, and respectively adds a pH regulator, a dispersant, a gangue mineral activator, a useful mineral inhibitor, a collecting and foaming agent according to the front and back sequence; for the mode of five medicaments of three agitator tank of tradition interpolation, avoided the mutual reaction between the medicament when different medicaments add an agitator tank simultaneously effectively, also realized simultaneously that a medicament combines with another medicament after with the mineral fully function, this kind of mode of step successive addition medicament has fully guaranteed the performance of medicament effect, has guaranteed the flotation effect.
The five stirring tanks fully ensure the exertion of the medicament effect by a mode of adding the medicament step by step and successively, and ensure the flotation effect.
2) Because the spiral steam pipeline is arranged in each stirring tank, the ore pulp is heated through the spiral steam pipeline, when the tail end fine flotation tank is closed or restarted in partial operation when concentrate products with different indexes are produced, the total steam quantity of the ore pulp fed into the stirring tanks is controlled by closing or restarting the flashboard valves on the steam pipes of one or a plurality of stirring tanks according to the temperature displayed by the temperature sensor of the tail end working flotation tank, and further the temperature of the ore pulp is regulated and controlled, the purpose of regulating the steam quantity according to the number of the working flotation tanks in the flotation operation is realized, the waste of energy is avoided, and the purpose of saving energy is achieved.
3) When the flotation ore feeding amount is reduced, the number of the operation sections for flotation can be closed and reduced, so that the natural cooling time of the flotation ore pulp is reduced, the required heating energy is reduced, the total steam amount fed into the ore pulp is controlled by closing a flashboard valve on a steam pipe of one or a plurality of stirring tanks according to the temperature displayed by a temperature sensor of the flotation tank working at the tail end, the temperature of the ore pulp is regulated and controlled, the purpose of regulating the steam amount according to the number of the working flotation tanks for flotation operation is realized, the energy waste is avoided, and the purpose of saving energy is achieved.
4) The underflow tailings of each fine flotation of the invention are returned to the last fine flotation operation, the froth concentrate of each scavenging flotation is returned to the last scavenging flotation operation, and the mineral returning time of each section of return operation is prolonged compared with the traditional flotation mode of returning to the last operation, thereby effectively improving the recovery rate of the flotation concentrate, and the recovery rate of the flotation concentrate in the mode is improved by 2-5 percent compared with the traditional flotation mode.
5) The method can cut off the subsequent concentration operation of the section of flotation operation by closing the gate valve on the pipeline leading to the operation concentrate pump pool at the bottom of the froth tank of any section of the concentration flotation tank in the middle of the flotation and opening the gate valve at the bypass discharge port, thereby taking the concentrate of the section of flotation operation as the final concentrate to feed into the final concentrate pump pool; the number of stages of flotation concentration operation can be controlled through the method, so that the concentrate grade and the recovery rate of flotation products are adjusted, the flotation operation with multiple product indexes is realized, and different market demands are met.
Drawings
Fig. 1 is a schematic structural diagram of the energy-saving iron concentrate product index-adjustable direct flotation system.
Fig. 2 is an enlarged view of the flotation agent agitation operation system.
Fig. 3 is an enlarged view of a portion C of fig. 1.
Fig. 4 is an enlarged view of a portion D of fig. 1.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the multi-product direct flotation system of the present invention includes a flotation agent stirring system 1, a rough flotation operation system, a sweeping flotation operation system, and a fine flotation operation system, and is characterized in that:
as shown in fig. 2, the flotation reagent stirring system 1 of the present invention adopts five flotation reagent stirring tanks, a first PH regulator stirring tank, a second dispersant stirring tank, a third useful mineral activator stirring tank, a fourth gangue mineral depressant stirring tank, a fifth useful mineral collector and foamer stirring tank, which are connected in sequence, wherein the five stirring tanks are provided with spiral steam pipes 103 along the inner tank wall, the inlets of the steam pipes of each stirring tank are connected to the same steam header pipe 101, and the inlets of each stirring tank are provided with gate valves 102; the invention adopts five stirring tanks which are connected in sequence, and respectively adds a pH regulator, a dispersant, a gangue mineral activator, a useful mineral inhibitor, a collecting and foaming agent according to the front and back sequence; for the mode of five medicaments of three agitator tank of tradition interpolation, avoided the mutual reaction between the medicament when different medicaments add an agitator tank simultaneously effectively, also realized simultaneously that a medicament combines with another medicament after with the mineral fully function, this kind of mode of step successive addition medicament has fully guaranteed the performance of medicament effect, has guaranteed the flotation effect. The five stirring tanks fully ensure the exertion of the medicament effect by a mode of adding the medicament step by step and successively, and ensure the flotation effect.
The rough flotation operation system consists of a rough flotation operation cell group 2, the sweeping flotation operation system consists of continuous four-section sweeping flotation operation cell groups which are communicated with each other, the fine flotation operation system also consists of continuous four-section fine flotation operation cell groups which are communicated with each other, and a concentrate bypass main pipeline 19 is arranged at the lower part of the fine flotation operation system;
as shown in fig. 3, each section of the flotation operation cell group of the invention is composed of three flotation operation cells which are connected with each other through an intermediate cell 11, the lower part of each intermediate cell 11 of the rough flotation operation cell and the scavenging flotation operation cell is provided with a mineral discharge port, one side of the lower part of the intermediate cell 11 is connected with the previous flotation operation cell through a tailing mineral discharge pipe 22, and the other side of the lower part of the intermediate cell 11 is connected with the next flotation operation cell through an L-shaped connecting pipe 21;
as shown in fig. 4, a mine drainage port is also formed at the bottom of the middle tank of the fine flotation operation tank 11, one side of the lower part of the middle tank is connected with the next flotation operation tank through a tailings drainage pipe 22, the other side of the lower part of the middle tank 11 is connected with the previous flotation operation tank through an L-shaped connecting pipe 21, and a rubber plug valve 23 is arranged in each middle tank 11.
The primary rough flotation operation cell group comprises three operation cells which are mutually connected by an intermediate cell 11, a concentrate collecting groove which is arranged at the upper part of the three operation cells, a rough flotation concentrate ore discharge pipe 2-1 which is connected with the concentrate collecting groove, and a rough flotation tailing ore discharge opening and a rough flotation tailing ore discharge pipe 22 which are arranged at the lower part of the three operation cells, wherein the rough flotation concentrate ore discharge pipe 2-1 is used as an ore supply pipe of primary fine flotation operation and is communicated with the primary fine flotation operation cell 7, and the rough flotation tailing ore discharge pipe 21 of the last rough flotation cell of the primary rough flotation operation is used as an ore supply pipe of a scavenging flotation operation system and is communicated with the scavenging flotation operation system through the intermediate cell 11.
The invention relates to a continuous four-section sweeping flotation operation cell group which comprises a primary sweeping flotation operation cell group 3, a secondary sweeping flotation operation cell group 4, a tertiary sweeping flotation cell group 5 and a quaternary sweeping flotation cell group 6 which are connected in sequence, wherein each sweeping flotation operation cell group also comprises three flotation operation cells, the upper part of each flotation operation cell is provided with a concentrate collecting tank and a sweeping flotation concentrate discharging pipe connected with the concentrate collecting tank, a concentrate discharging pipe 3-1 of the primary sweeping flotation operation cell and a concentrate discharging pipe 4-1 of the secondary sweeping flotation operation cell are connected with a primary rough flotation operation cell group 2 through a mineral conveying pipe 14, a concentrate discharging pipe 5-1 of the tertiary sweeping flotation operation cell is connected with the primary sweeping flotation operation cell group 3 through a mineral conveying pipe 13, and a concentrate discharging pipe 6-1 of the quaternary sweeping flotation operation cell is connected with the secondary sweeping flotation operation cell group 4 through a mineral conveying pipe 12, and a tailing discharge pipe is arranged at the lower part of each sweeping flotation operation tank, the tailing discharge pipe at the lower part of the previous sweeping flotation operation tank is connected with the next sweeping flotation operation tank through an intermediate tank, and the tailing discharge pipe 6-2 at the lower part of the last sweeping flotation operation tank is connected with a tailing pond.
The invention relates to a continuous four-section fine flotation operation cell group, which comprises a first section fine flotation operation cell group 7, a second section fine flotation operation cell group 8, a three section fine flotation cell group 9 and a four section fine flotation cell group 10 which are connected in sequence, wherein each section fine flotation operation cell group consists of three fine flotation operation cells, a concentrate collecting tank is arranged at the upper part of each section of three fine flotation operation cells, a fine flotation concentrate discharge pipe and a fine flotation tailing discharge pipe are connected with the concentrate collecting tank, the fine flotation concentrate discharge pipe consists of a fine flotation concentrate discharge pipe A and a fine flotation concentrate discharge pipe B, each section of fine flotation concentrate discharge pipe A is used as a discharge pipe with different grades and is connected with a concentrate bypass main pipeline 19, a gate valve 20 is arranged on each fine flotation concentrate discharge pipe A and each flotation concentrate discharge pipe B, and a section of fine flotation tailing discharge pipe 7-1 and a section of fine flotation discharge pipe 8-1 are communicated with a rough flotation operation system 2 through a tailing conveying pipe 15 The three-section fine flotation tailing discharging pipe 9-1 is connected with the first-section fine flotation cell group 7 through a tailing conveying pipe, the four-section fine flotation tailing discharging pipe 10-1 is connected with the second-section fine flotation cell group 8 through a tailing conveying pipe, the first-section fine flotation concentrate discharging pipe 7B is communicated with the second-section fine flotation cell group 8 through a concentrate conveying pipe 18, the second-section fine flotation concentrate discharging pipe 8B is communicated with the third-section fine flotation cell group 9 through a concentrate conveying pipe 17, the three-section fine flotation concentrate discharging pipe 9B is communicated with the four-section fine flotation cell group 10 through a concentrate conveying pipe 16, and the four-section fine flotation concentrate discharging pipe is a final concentrate discharging pipe A and is connected with a concentrate bypass main pipeline 19.
The subsequent concentration operation of the section of flotation operation can be cut off by closing the gate valve 20 on any section of concentrate discharge pipe A in the concentration flotation operation and opening the gate valve at the discharge port of the concentrate bypass main pipeline 19, so that the concentrate of the section of flotation operation is taken as the final concentrate and fed into the final concentrate pump pond; the number of stages of the fine flotation and concentration operation can be controlled through the mode, so that the concentrate grade and the recovery rate of the flotation product are adjusted, the flotation operation of a multi-product scheme is realized, and different market demands are met.
The invention is provided with a temperature sensor 21 on each of the fine flotation operation tank and the sweeping flotation operation tank. Therefore, the total steam flow of the fed ore pulp can be controlled to regulate and control the temperature of the ore pulp by closing the gate valve on the steam pipe of one or a plurality of stirring tanks according to the temperature displayed by the temperature sensor, the purpose of regulating the steam flow according to the number of the working flotation tanks in flotation operation is realized, the energy waste is avoided, and the purpose of saving energy is achieved.

Claims (4)

1. The utility model provides an energy-saving iron ore concentrate product index adjustable direct flotation system, includes flotation reagent mixing system, rough flotation operation system, sweeps flotation operation system and smart flotation operation system, its characterized in that:
the flotation reagent stirring system adopts five flotation reagent stirring tanks, a first PH regulator stirring tank, a second dispersant stirring tank, a third useful mineral activating agent stirring tank, a fourth gangue mineral inhibitor stirring tank, a fifth useful mineral collecting agent and foaming agent stirring tank which are sequentially connected, spiral steam pipes are arranged on the five stirring tanks along the inner side tank walls, the inlet of each steam pipe of each stirring tank is connected with the same steam header pipe, and a gate valve is arranged at the inlet of each stirring tank;
the rough flotation operation system consists of a rough flotation operation cell bank, the sweeping flotation operation system consists of four continuous sweeping flotation operation cell banks which are communicated with each other, the fine flotation operation system also consists of four continuous fine flotation operation cell banks which are communicated with each other, and a concentrate bypass main pipeline is arranged at the lower part of the fine flotation operation system;
each section of flotation operation cell group consists of three flotation operation cells which are mutually connected through an intermediate cell, the lower part of each intermediate cell of the rough flotation operation cell group and the sweeping flotation operation cell group is provided with an ore discharge port, one side of the lower part of the intermediate cell is connected with the previous flotation operation cell through a tailing ore discharge pipe, and the other side of the lower part of the intermediate cell is connected with the next flotation operation cell through an L-shaped connecting pipe;
the bottom of each intermediate box of the fine flotation operation cell group is also provided with a mineral discharge port, one side of the lower part of each intermediate box is connected with the previous fine flotation operation cell through a tailing mineral discharge pipe, the other side of the lower part of each intermediate box is connected with the next fine flotation operation cell through an L-shaped connecting pipe, and each intermediate box is internally provided with a rubber plug valve;
the rough flotation operation cell group comprises three operation cells which are mutually connected through an intermediate cell, a concentrate collecting tank arranged on the upper portion of each operation cell, a rough flotation concentrate ore discharge pipe connected with the concentrate collecting tank, and a rough flotation tailing ore discharge port and a rough flotation tailing ore discharge pipe arranged on the lower portion of each operation cell, wherein the rough flotation concentrate ore discharge pipe is communicated with the first fine flotation operation cell as an ore feeding pipe of the first fine flotation operation, and the rough flotation tailing ore discharge pipe of the last rough flotation cell of the first rough flotation operation is communicated with a sweeping flotation operation system through the intermediate cell.
2. The energy-saving direct flotation system with adjustable product indicators of iron ore concentrates according to claim 1, wherein the continuous four-stage sweeping flotation cell bank comprises a primary sweeping flotation cell bank, a secondary sweeping flotation cell bank, a tertiary sweeping flotation cell bank and a quaternary sweeping flotation cell bank which are connected in sequence, each sweeping flotation cell bank also comprises three flotation cells, each flotation cell bank is provided with an ore concentrate collecting tank and a sweeping flotation ore concentrate discharging pipe connected with the ore concentrate collecting tank at the upper part, the ore concentrate discharging pipe of the primary sweeping flotation cell and the ore concentrate discharging pipe of the secondary sweeping flotation cell are connected with the primary rough flotation cell bank through ore conveying pipes, the ore concentrate discharging pipe of the tertiary sweeping flotation cell is connected with the primary sweeping flotation cell bank through ore conveying pipes, and the ore concentrate discharging pipe of the quaternary sweeping flotation cell is connected with the secondary sweeping flotation cell bank through ore conveying pipes, and a tailing discharge pipe is arranged at the lower part of each sweeping flotation operation tank, the tailing discharge pipe at the lower part of the previous sweeping flotation operation tank is connected with the next sweeping flotation operation tank through an intermediate box, and the tailing discharge pipe at the lower part of the last sweeping flotation operation tank is connected with a tailing pond.
3. The energy-saving iron concentrate product index-adjustable direct flotation system according to claim 1, wherein the continuous four-stage fine flotation cell bank comprises a first-stage fine flotation cell, a second-stage fine flotation cell, a third-stage fine flotation cell and a four-stage fine flotation cell connected in series, each fine flotation cell comprises three fine flotation cells, a concentrate collecting tank is disposed at an upper portion of each of the three fine flotation cells, a fine flotation concentrate discharge pipe and a fine flotation tailing discharge port connected to the concentrate collecting tank, the fine flotation concentrate discharge pipe comprises a fine flotation concentrate discharge pipe A and a fine flotation concentrate discharge pipe B, each of the fine flotation concentrate discharge pipes A is connected to the concentrate bypass main pipe as a different grade discharge pipe, and a gate valve is disposed on each of the fine flotation concentrate discharge pipe A and the flotation concentrate discharge pipe B, the primary fine flotation tailing discharge pipe and the secondary fine flotation tailing discharge pipe are communicated with a rough flotation operation system through tailing conveying pipes, the three-section fine flotation tailing discharge pipe is connected with the primary fine flotation cell bank through a tailing conveying pipe, the four-section fine flotation tailing discharge pipe is connected with the secondary fine flotation cell bank through a tailing conveying pipe, the primary fine flotation concentrate discharge pipe B is communicated with the secondary fine flotation cell bank through a concentrate conveying pipe, the secondary fine flotation concentrate discharge pipe B is communicated with the three-section fine flotation cell bank through a concentrate conveying pipe, the three-section fine flotation concentrate discharge pipe B is communicated with the four-section fine flotation cell bank through a concentrate conveying pipe, and the four-section fine flotation concentrate discharge pipe is a final concentrate discharge pipe A and is connected with a concentrate bypass main pipeline.
4. The energy-saving iron concentrate product index-adjustable direct flotation system according to claim 1, wherein a temperature sensor is provided in each of the concentrate flotation tank and the sweep flotation tank.
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