CN108480057B - flotation pulp preprocessing device - Google Patents

Abstract

The invention discloses a flotation pulp pretreatment device, which is characterized in that: the novel ore pulp mixing device comprises an ore pulp barrel with an ore pulp underflow port (12) arranged at the bottom, a mixing blade (8) and a mixing shaft sleeve (5) which are arranged in the ore pulp barrel in a coaxial mode with the ore pulp barrel from bottom to top, a mixing dosing pipe (9) which extends out of the ore pulp barrel and is used for adding medicaments into the mixing shaft sleeve is arranged on the mixing shaft sleeve (5), an ore pulp overflow groove (10) and an ore pulp discharge port (11) are arranged on the upper side of the ore pulp barrel, a ring pipe (2) with an ore pulp feeding port (1), an emulsifying dosing port (3) and a plurality of shunt pipes (4) is arranged around the outer wall of the ore pulp barrel, and nozzles connected with outlets of the shunt pipes (4) extend into the ore pulp barrel in a tangential direction respectively. The advantages are that: the consumption of the medicament is reduced, the adsorption effect of medicament molecules and mineral particles is improved, and inevitable ions in flotation are reduced; the equipment is small in size, simple in structure and convenient to maintain.

Description

A flotation pulp pretreatment device

technical field

The invention belongs to the technical field of mineral flotation mechanical equipment, and in particular relates to a flotation pulp pretreatment device.

Background technique

Flotation is one of the most important methods of mineral separation, and the pulping process is the premise of realizing efficient mineral flotation. The traditional slurry preparation process is to carry out slurry mixing in the mixing tank device to achieve sufficient dispersion of mineral particles and facilitate slurry transportation; to achieve drug molecular dispersion and adsorption on the surface of mineral particles; to adjust flotation concentration and other functions. Collectors and inhibitors can be adsorbed on the surface of solid particles through different adsorption effects through slurry adjustment, and the remaining regulators and foaming agents are fully mixed with the pulp liquid. However, most flotation reagents are macromolecular organics with poor solubility and dispersibility. In production practice, simple slurry mixing often results in insufficient adsorption of reagent molecules on the surface of mineral particles, resulting in a large waste of reagents, which inevitably increases ions, chemically deteriorates the flotation solution, and reduces flotation efficiency. Therefore, the quality of pulp mixing and dosing plays a vital role in flotation separation. Efficient pulp pretreatment device is one of the most effective means to improve flotation separation effect and reduce chemical consumption.

Contents of the invention

The purpose of the present invention is to solve the shortcomings in the above-mentioned prior art, such as large consumption of flotation reagents, low flotation efficiency, complicated sorting process, high cost, and high environmental protection pressure due to insufficient slurry mixing and stirring. Therefore, a high-efficiency flotation pulp pretreatment device based on step-enhanced adsorption is provided. The invention improves the adsorption effect of drug molecules and mineral particles and improves the flotation efficiency through jet flow, low-speed mixing, and "W-shaped flow" step-enhanced adsorption. The equipment is small in size, simple in structure, and easy to maintain.

The purpose of the present invention can be achieved through the following technical solutions:

The flotation pulp pretreatment device of the present invention comprises a pulp bucket with a pulp bottom outlet at the bottom, a stirring blade and a stirring shaft sleeve installed in the pulp bucket in a coaxial manner with the pulp bucket from bottom to top, and the stirring shaft sleeve There is a stirring and dosing pipe extending to the outside of the pulp barrel for adding chemicals to the stirring shaft sleeve. A pulp overflow tank and a pulp outlet are arranged on the upper side of the pulp barrel, and a belt is installed around the outer wall of the pulp barrel. There is a slurry feeding port, an emulsifying chemical feeding port and a ring pipe of several shunting pipes, and the nozzles connected with the outlets of the shunting pipes respectively extend into the pulp barrel tangentially.

In the present invention, the stirring shaft sleeve is suspended under the upper cover of the pulp barrel, and several circular through holes are evenly distributed on the stirring shaft sleeve; the stirring blades are installed in the stirring shaft sleeve, And the stirring shaft extending vertically upwards is combined with the motor drive system arranged on the top of the slurry tank, and is set under the stirring shaft sleeve in a suspended manner.

The cross-section of the annular pipe in the present invention is a square structure, and six shunt pipes are evenly distributed around the annular pipe; the bottom of the slurry tank is a 45-degree cone, and an underflow control valve is installed for maintenance. The bucket body is fixedly installed on the frame through the connecting piece.

In the present invention, the tangential entry direction of the nozzle connected to the outlet of the shunt pipe is opposite to the rotation direction of the stirring blade. The high-speed jet flow produced by the nozzle, the stirring blade and the sleeve produce negative pressure suction, and the opposite direction makes the two fluids form a "W" type flow", increasing the secondary mixing of pulp.

In the present invention, the feed inlet and the annular pipe are fixed horizontally at the place 600 mm below the slurry tank of the pretreatment device, and the annular pipe is 50 mm away from the barrel body, so as to ensure that the nozzle of the shunt pipe can enter and exit the barrel body tangentially, and maintenance can be realized and replace.

Working principle of the present invention and beneficial effect are as follows:

The raw ore pulp enters the annular pipe through the pulp feeding port, and the first type of flotation agents (such as regulators, collectors, or insoluble and difficult to disperse agents, etc.) also enters the annular pipe through the emulsification feeding port. Preliminary mixing with the slurry in the annular tube. The preliminarily mixed slurry enters the slurry tank tangentially with high-speed jets from the nozzles of the six distribution pipes. During this process, the first type of chemical is dispersed into an emulsified state, and the chemical molecules are on the surface of the mineral under the action of high turbulence. Adsorption (through the high-speed jet action of the agent and the pulp to emulsify the insoluble agent and attach it efficiently to the surface of the mineral particles). At the same time, add the second type of chemical (such as foaming agent, easy-to-dissolve and disperse chemical, etc.) Mixed adsorption, and make the ore pulp in a suspended state, after fully dissociated, the particle size and concentration meet the flotation requirements of raw ore pulp. The pretreated pulp flows out from the pulp outlet through the overflow tank. The bottom outlet of the slurry tank is set at the bottom of the slurry tank for discharge, shutdown and maintenance.

In the above-mentioned high-efficiency flotation pulp pretreatment device, after high-speed jet emulsification, the pulp adsorbed on the surface of the particles is suspended through the stirring shaft sleeve and the motor-driven stirring blades, and a "W"-shaped flow is formed in the barrel, which is easy The dissolved and dispersed second-type medicament is fed into the stirring shaft sleeve at a height of 75 cm through the stirring dosing pipe, and the mixing, adsorption and suspension of the second-type medicament are realized under the action of low turbulence.

To sum up, the advantages of the present invention are: reducing the consumption of chemicals, improving the adsorption effect of drug molecules and mineral particles, reducing unavoidable ions in flotation; the equipment is small in size, simple in structure and easy to maintain.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a schematic cross-sectional view of FIG. 1 .

Figure 3 is a schematic diagram of the shunt tube structure.

Detailed ways

The present invention will be further described below in conjunction with embodiment (accompanying drawing):

As shown in Figures 1 and 2, the flotation pulp pretreatment device of the present invention includes a pulp bucket with a bottom flow port 12 at the bottom, and a stirring blade 8 installed in the pulp bucket in a coaxial manner with the pulp bucket from bottom to top. The stirring shaft sleeve 5 is provided with a stirring dosing tube 9 extending outside the pulp barrel for adding medicine to the stirring shaft sleeve, and the stirring shaft sleeve 5 is suspended on the pulp barrel Below the upper cover, and several circular through-holes are evenly distributed on the stirring shaft sleeve 5; the stirring blade 8 passes through the stirring shaft 7 and the setting The motor drive system 6 on the top of the pulp bucket is combined, and the bottom of the stirring shaft sleeve 5 is set in a suspended manner; a pulp overflow tank 10 and a pulp outlet 11 are arranged on the upper side of the pulp bucket, which are installed around the outer wall of the pulp bucket There is an annular pipe 2 with a pulp feeding port 1, an emulsification dosing port 3 and six shunt pipes 4, and the nozzles connected to the outlets of the shunt pipes 4 respectively extend into the pulp barrel tangentially; the ring pipe 2 The cross-section is a square structure, and six shunt pipes 4 are arranged in a uniform manner around the annular pipe 2; the bottom of the slurry tank is a 45-degree cone, and is installed with an underflow control valve for maintenance, and the tank body is fixed and installed by connecting pieces on the rack.

The structure of the shunt pipe 4 is shown in FIG. 3 .

In the present invention, the tangential entry direction of the nozzle connected to the outlet of the shunt pipe 4 is opposite to the rotation direction of the stirring blade 8. The high-speed jet flow produced by the nozzle causes the negative pressure suction effect of the stirring blade 8 and the sleeve 5, and the opposite direction makes the two streams The fluid forms a "W-shaped flow", which increases the secondary mixing of the pulp.

In the present invention, the inlet 1 and the annular pipe 2 are fixed horizontally at the place 600 mm below the slurry tank of the pretreatment device, and the annular pipe is 50 mm away from the barrel to ensure that the nozzle of the shunt pipe can enter and exit the barrel tangentially, and can Realize maintenance and replacement.

The motor drive system 6 described in the present invention drives the stirring shaft 7 at a speed of 300 r/min to realize the mixing and adsorption of the second type of medicament and the pulp, and make the pulp in a suspended state. The feeding port 1 is connected to the feeding pipeline through a flange with a nominal diameter of DN80, and the cross-section of the annular pipe is a square with a side length of 80 mm. The nominal diameter of the shunt pipe is DN25, the inner diameter of the nozzle opening is 15 mm, and the nozzles of the shunt pipe 4 respectively extend 20 mm into the pulp bucket tangentially.

The cylinder of the pulp pretreatment device of the present invention has a reference diameter of 1000 mm and a height of 1280 mm. A stirring shaft sleeve 5 with a diameter of 450 mm is fixed in the pulp tank through a cantilever. 100 mm circular openings are evenly distributed on the sleeve, and the opening rate is 38%. Fix 700mm long along sleeve, 25mm diameter stirs and feeds pipe 9.

The present invention uses a 3kw motor to drive the 1000mm long stirring shaft 7 to drive the three-blade impeller to rotate through the belt pulley deceleration at a speed of 300r/min. This rotation speed makes the second type of chemical agent easy to disperse, and realizes low-speed mixing and adsorption of subsequent acting chemical agent and ore pulp.

In the present invention, the jet flow produced by the nozzle of the shunt pipe 4, the low-speed stirring system produced by the stirring shaft sleeve 5, the stirring shaft 7, and the stirring blade 8, and the secondary mixing effect formed by "W-shaped flow" affect the solubility from difficult to easy respectively. And the order is from the front to the back of the reagents to form a "step-enhanced adsorption effect".

Main features of the present invention are:

(1) After preliminary mixing, the insoluble and difficult-to-disperse chemicals and pulp are emulsified by high-speed jet to achieve high-efficiency adsorption.

(2) Easily soluble and dispersible chemicals realize low turbulence mixing and adsorption, and realize slurry suspension through the bottom "W" flow.

(3) Reagents with different degrees of difficulty in adsorption can achieve high-efficiency flotation pulp pretreatment through cascade strengthening.

Claims (2)

1. A flotation pulp preprocessing device which characterized in that: the device comprises an ore pulp barrel, a stirring blade (8) and a stirring shaft sleeve (5), wherein the bottom of the ore pulp barrel is provided with an ore pulp bottom flow port (12), the stirring blade (8) and the stirring shaft sleeve (5) are arranged in the ore pulp barrel from bottom to top in a mode of being coaxial with the ore pulp barrel, a stirring chemical adding pipe (9) which extends out of the ore pulp barrel and is used for adding a chemical into the stirring shaft sleeve is arranged on the stirring shaft sleeve (5), an ore pulp overflow groove (10) and an ore pulp discharge port (11) are arranged at the lateral upper part of the ore pulp barrel, an annular pipe (2) with an ore pulp feeding port (1), an emulsifying chemical adding port (3) and a plurality of shunt pipes (4) is arranged around the outer wall of the ore pulp barrel, and nozzles connected with; the stirring shaft sleeve (5) is suspended below the upper cover body of the slurry barrel, and a plurality of circular through holes are uniformly distributed on the stirring shaft sleeve (5); the stirring blades (8) are combined with a motor driving system (6) arranged at the top of the slurry barrel through a stirring shaft (7) which is arranged in the stirring shaft sleeve (5) in a penetrating way and vertically extends upwards, and are arranged below the stirring shaft sleeve (5) in a suspension way; the cross section of the annular pipe (2) is of a square structure, and six shunt pipes (4) are uniformly distributed around the annular pipe (2); the tangential entering direction of the nozzle connected with the outlet of the shunt pipe (4) is opposite to the rotating direction of the stirring blade (8), and the high-speed jet flow generated by the nozzle, the stirring blade and the fluid generated by the sleeve under the negative pressure suction effect jointly form W-shaped flow in the opposite direction, so that the secondary mixing of the ore pulp is increased.

2. The flotation pulp pretreatment device according to claim 1, characterized in that: the bottom of the slurry barrel is a 45-degree cone, the bottom of the slurry barrel is provided with an overhauling bottom flow control valve, and the barrel body is fixedly arranged on the rack through a connecting piece.