WO2018227969A1

WO2018227969A1 - Swirling static combined double-section type flow field fine particle flotation apparatus

Info

Publication number: WO2018227969A1
Application number: PCT/CN2018/073066
Authority: WO
Inventors: 张晋霞; 牛福生; 王龙; 梁银英
Original assignee: 华北理工大学
Priority date: 2017-06-15
Filing date: 2018-01-17
Publication date: 2018-12-20
Also published as: ZA201902211B; CN107213995A; CN107213995B

Abstract

Disclosed is a swirling static combined double-section type flow field fine particle flotation apparatus, belonging to the technical field of mineral processing. The swirling static combined double-section type flow field fine particle flotation apparatus comprises a mixing drum (2), wherein a feeding pipe (3) is connected to one side of the upper end of the mixing drum (2); a first mixing rod (6) is inserted at the upper end of the mixing drum (2), and the first mixing rod (6) is mounted to the mixing drum (2) by a bearing; a first belt pulley (1) is arranged on the first mixing rod (6), and the first belt pulley (1) is located at the upper side of the mixing drum (2); and a flow guiding drum (4), an upper high speed mixing impeller (5) and a lower high speed mixing impeller (7) are arranged at the inner side of the mixing drum (2) successively from top to bottom, and each of the flow guiding drum (4), the upper high speed mixing impeller (5) and the lower high speed mixing impeller (7) is connected to the first mixing rod (6). The invention achieves the double-section type flow field flotation separation for fine particle minerals, and changes the current situation that the flow field characteristic of the flotation apparatus is single, significantly improving a flotation recycling effect of the fine particle minerals.

Description

Rotary static combined two-stage flow field fine particle flotation equipment

Technical field

The invention relates to the technical field of mineral processing, and more particularly to a combined static and two-stage flow field fine particle flotation device.

Background technique

In the process of mining production, a large number of fine mineral particles that are difficult to sort and recycle are inevitable due to the process and equipment. At the same time, the long-term exploitation and utilization leads to the phenomenon that the useful mineral resources are “poor, fine and miscellaneous”, and the granularity of the selected ore is usually Fine grinding to about 10μm-30um, even finer to obtain a suitable monomer dissociation, and the large reduction in mineral particle size directly causes a sharp deterioration of its sorting performance. As a resource-consuming country, China’s annual losses due to the fineness of minerals can not be recycled.

The prior art mostly adopts flotation treatment, and the conventional flotation machinery mostly has high-strength stirring and multi-tank repetition, and the sorting flow field has the characteristics of high turbulent intensity, and this feature is advantageous for coarse particle sorting, and Fine particle sorting is unfavorable. Although the flotation column improves the sorting and recovery effect of fine-grained minerals to a certain extent, it focuses too much on the collision and adsorption of bubbles and particles in the static flow field, and the forced mixing effect of the slurry is insufficient. Further improvement of fine particle mineral flotation index. Aiming at the fact that the current flotation equipment has a single flow field and there is still a large space in improving the flotation recovery effect of fine particle minerals, a two-stage flow field fine particle flotation equipment based on static and static is designed.

Summary of the invention

1. Technical problems to be solved

The object of the present invention is to overcome the deficiencies in the prior art, and to provide a state of swirling static combined with two-stage flow field suitable for fine particle flotation, thereby realizing efficient sorting of fine particle minerals.

2. Technical solutions

In order to solve the above problems, the present invention adopts the following technical solutions.

The invention relates to a rotary static combined two-stage flow field fine particle flotation device, comprising a mixing drum, a feeding pipe is connected to an upper end side of the mixing drum, and a first stirring rod is inserted at an upper end of the mixing drum, and A stirring rod is mounted on the mixing drum through a bearing, the first stirring rod is mounted with a first pulley, and the first pulley is located at an upper side of the mixing drum, and the inner side of the mixing drum is provided with a flow guiding from top to bottom. a cylinder, an upper high-speed stirring impeller and a lower high-speed stirring impeller, and the guiding tube, the upper high-speed stirring impeller and the lower high-speed stirring impeller are connected to the first stirring rod, and the inner bottom of the mixing barrel is fixedly connected with a corrugated lining plate. A flotation tank is connected to one side of the mixing drum, and a slag discharging pipe is connected to a side of the flotation tank away from the mixing drum, and a small diameter elbow is connected to a lower end side of the mixing drum, and the small diameter elbow is far away. One end of the mixing drum extends into the flotation tank, and the small diameter elbow is provided with a rotating mechanism away from the upper side of the one end of the mixing drum, and the rotating mechanism comprises a fixing block, a second pulley, a second stirring rod and a low-speed stirring impeller. The fixed block is connected a support rod is connected, and the fixing block is connected to the mixing drum through a support rod, the second stirring rod is rotatably connected to the lower end of the fixing block, and the second pulley and the low-speed stirring impeller are connected to the second stirring rod, and the The second pulley is located at an upper end of the low-speed stirring impeller, the upper end of the flotation tank is connected with a foam overflow port, and the foam overflow port is located between the second pulley and the low-speed stirring impeller, and the bottom of the flotation tank is connected with microbubbles The generator has a double impeller in the mixing drum. The double impeller includes a high-speed stirring impeller and a high-speed stirring impeller. The high-speed stirring impeller has a diversion tube, and the high-speed stirring impeller rotates to generate a certain negative pressure, and the slurry is stirred at a high speed. Under the combined action of the impeller and the guide tube, a strong shear cycle occurs. In the formation of the swirl field, the fine-grained minerals are in full contact with the agent, collide and adhere, and the high-speed stirring impeller ensures that the fine-grained minerals that are stirred are not in the mixing drum. The bottom forms a sinking groove. The slurry has a certain pressure under the action of the height difference to enter the flotation tank. The sprayed slurry is uniformly distributed into the flotation tank under the action of the low-speed stirring impeller, and the falling fine minerals meet the rising micro-bubbles, and the mixing drum The swirling flow field formed by the stirring of the high-speed stirring impeller and the high-speed stirring impeller and the static flow field formed by the falling of single fine-grained minerals and the rise of micro-bubbles in the flotation tank, mineralization and formation of minerals in the static flow field The bubbles rise from the flotation overflow of the flotation cell, and the gangue minerals continue to fall out of the slag discharge pipe. A flotation mode of two-stage flow field combined with static rotation is formed to achieve efficient separation of fine particle minerals.

Preferably, the height of the mixing drum is higher than the height of the foam overflow, and the height difference is such that the slurry is self-flowed into the flotation tank by the mixing drum and has a certain pressure to form a spray state.

Preferably, the outer side of the small diameter elbow is coated with a waterproof layer, and the waterproof layer can prevent the slurry from sticking for a long time and affect the flotation.

Preferably, the inside of the mixing drum is provided with a corrugated liner, the corrugated liner is laid at the lower end of the mixing drum, and the height of the corrugated liner does not exceed the high-speed stirring impeller, and the corrugated liner can improve the shearing of the pulp. performance.

Preferably, the distance between the upper high-speed stirring impeller and the lower high-speed stirring impeller does not exceed the distance between the low-speed stirring impeller and the lower high-speed stirring impeller, and the double impeller in the mixing drum rotates at a high speed to generate a certain negative pressure, and is fed from the mixing drum. The slurry flowing into the pipe is strongly sheared under the combined action of the upper high-speed stirring impeller and the guide tube. In the formed swirling field, the fine-grained minerals are in full contact with the agent, collide and adhere, and the distance between the double impellers Should not be too large, the distance between the high-speed stirring impeller and the lower high-speed stirring impeller does not exceed the distance between the low-speed mixing impeller and the lower high-speed mixing impeller. The main function of the high-speed stirring impeller is to ensure that the fine-grained minerals will not be stirred. The bottom of the cylinder forms a sinking groove.

3. Beneficial effects

The advantages of the present invention over the prior art are:

(1) The double-impeller is arranged in the mixing drum of the scheme. The double impeller includes a high-speed stirring impeller and a high-speed stirring impeller. The high-speed stirring impeller has a guide tube, and the high-speed stirring impeller rotates to generate a certain negative pressure. The slurry is on the upper part. The high-speed mixing impeller and the guide tube combine to form a strong shear cycle. In the formation of the swirl field, the fine-grained minerals are in full contact with the agent, collide and adhere, and the high-speed stirring impeller ensures that the fine-grained minerals will not be stirred. The bottom of the mixing drum forms a sinking groove. The slurry has a certain pressure under the action of the height difference to enter the flotation tank. The sprayed slurry is uniformly distributed into the flotation tank under the action of the low-speed stirring impeller, and the falling fine minerals meet the rising micro-bubbles, and the mixing drum The swirling flow field formed by the stirring of the high-speed stirring impeller and the high-speed stirring impeller and the static flow field formed by the falling of single fine-grained minerals and the rise of micro-bubbles in the flotation tank, mineralization and formation of minerals in the static flow field The bubbles rise from the flotation overflow of the flotation cell, and the gangue minerals continue to fall out of the slag discharge pipe. A flotation mode of two-stage flow field combined with static rotation is formed to achieve efficient separation of fine particle minerals.

(2) The height of the mixing drum is higher than the foam overflow, and the height difference can ensure that the slurry flows from the mixing drum into the flotation tank and has a certain pressure to form a spraying state.

(3) The outer side of the small diameter elbow is coated with a waterproof layer, and the waterproof layer can prevent the slurry from sticking for a long time and affect the flotation.

(4) The inside of the mixing drum is provided with a corrugated liner, which is laid at the lower end of the mixing drum, and the height of the corrugated liner does not exceed the high-speed stirring impeller, and the corrugated liner can improve the shear performance of the slurry.

(5) The distance between the high-speed stirring impeller and the lower high-speed stirring impeller does not exceed the distance between the low-speed stirring impeller and the lower high-speed stirring impeller. The double impeller in the mixing drum rotates at a high speed to generate a certain negative pressure, flowing from the mixing tube feeding tube. The slurry is strongly sheared under the combined action of the upper high-speed agitating impeller and the guide tube. In the formed swirling field, the fine-grained minerals are in full contact with the agent, collide and adhere, and the distance between the double impellers should not be excessive. The distance between the high-speed stirring impeller and the lower high-speed stirring impeller does not exceed the distance between the low-speed stirring impeller and the lower high-speed stirring impeller. The main function of the high-speed stirring impeller is to ensure that the fine-grained fine minerals are not at the bottom of the cylinder. Form a sinking groove.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

The label in the figure shows:

1 first pulley, 2 mixing drum, 3 feeding tube, 4 guiding tube, 5 high-speed stirring impeller, 6 first stirring rod, 7 high-speed stirring impeller, 8 wave liner, 9 support rod, 10 fixed block, 11 second pulley, 12 second stirring rod, 13 low speed stirring impeller, 14 small diameter elbow, 15 foam overflow, 16 flotation tank, 17 row slag tube, 18 microbubble generator.

detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention are clearly and completely described in the following description; apparently; the described embodiments are only a part of the embodiments of the present invention; rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the present invention without departing from the inventive scope are all within the scope of the present invention.

Example 1:

Referring to FIG. 1 , a static-static combined two-stage flow field fine particle flotation device includes a mixing drum 2, and a feeding pipe 3 is connected to an upper end side of the mixing drum 2, and a first end of the mixing drum 2 is inserted first. The stirring rod 6 is mounted, and the first stirring rod 6 is mounted on the mixing drum 2 via a bearing, the first pulley 1 is mounted on the first stirring rod 6, and the first pulley 1 is located on the upper side of the mixing drum 2, the inside of the mixing drum 2 From the top to the bottom, a guide tube 4, an upper high-speed stirring impeller 5 and a lower high-speed stirring impeller 7 are provided, and the guiding tube 4, the upper high-speed stirring impeller 5 and the lower high-speed stirring impeller 7 are connected to the first stirring rod 6. The inside of the mixing drum 2 is provided with a corrugated lining 8 which is laid at the lower end of the mixing drum 2, and the height of the corrugated lining 8 does not exceed the high-speed stirring impeller 5, and the corrugated lining 8 can improve the shear of the pulp. The cutting performance, the double impeller in the mixing drum 1 rotates at a high speed to generate a certain negative pressure, and the slurry flowing from the feeding tube 3 of the mixing drum 2 is strongly sheared under the combined action of the upper high-speed stirring impeller 5 and the guiding tube 4, In the formed swirling field, the fine-grained minerals are in full contact with the agent, collide and adhere The distance between the double impellers should not be too large, and the distance between the upper high-speed stirring impeller 5 and the lower high-speed stirring impeller 7 does not exceed the distance between the low-speed stirring impeller 13 and the lower high-speed stirring impeller 7. The main function of the lower high-speed stirring impeller 7 is It is ensured that the stirred fine granular mineral does not form a sinking groove at the bottom of the mixing drum 2, and the inner bottom of the mixing drum 2 is welded with a corrugated liner 8, and one side of the mixing drum 2 is connected with a flotation tank 16 which is far away from the flotation tank 16. One side of the mixing drum 2 is connected with a slag discharging pipe 17, and the lower end side of the mixing drum 2 is connected with an inverted "L" shaped small diameter elbow 14, and the small diameter elbow 14 extends away from one end of the mixing drum 2 to the flotation In the groove 16, the outer side of the small diameter elbow 14 is coated with a waterproof layer, the waterproof layer can prevent the slurry from sticking for a long time, affecting the flotation, and the small diameter elbow 14 is provided with a rotating mechanism on the upper side of the one end away from the mixing drum 2, and rotates. The mechanism comprises a fixed block 10, a second pulley 11, a second stirring rod 12 and a low-speed stirring impeller 13, on which a support rod 9 is connected, and the fixing block 10 is connected to the mixing drum 2 through a support rod 9, the second stirring rod 12 is rotatably connected to the lower end of the fixed block 10, the second skin The pulley 11 and the low-speed stirring impeller 13 are both connected to the second stirring rod 12, and the second pulley 11 is located at the upper end of the low-speed stirring impeller 13, and the upper end of the flotation tank 16 is connected with a foam overflow port 15 and a foam overflow port. 15 is located between the second pulley 11 and the low-speed stirring impeller 13, the height of the mixing drum 2 is higher than the foam overflow port 15, the height difference of the size can ensure that the slurry is self-flowing into the flotation tank by the mixing drum, and has a certain pressure to form In the spray state, the microbubble generator 18 is connected to the bottom of the flotation cell 16.

The mixing drum 2 has a double impeller stirring composed of a high-speed stirring impeller 5 and a lower high-speed stirring impeller 7, and the upper high-speed stirring impeller 5 cooperates with the guiding tube 4 to effectively increase the stirring strength, and the rotation of the high-speed stirring impeller 7 avoids the slurry in the mixing drum. 2 The bottom sinking groove, the fine-grained mineral forms a swirling flow field with high turbulence under the action of double impeller strong pulling and stirring, and the agitated pulp flows to the flotation tank 16 under self-pressure, and the flotation tank 16 is formed. In the static flow field, the slurry at the exit of the small-diameter elbow 14 is evenly distributed to the flotation tank 16 under the rotation of the upper low-speed stirring impeller 13, and the falling slurry and the upward floating bubble generated by the microbubble generator 18 are in the static flow field. In the middle collision, the useful mineral adheres to the bubble overflowing out of the flotation tank 16, and the gangue mineral is discharged from the lower slag discharge pipe 17, thereby realizing the two-stage flow field flotation separation of the fine-grained mineral, changing the current flotation equipment. The current state of the flow field is characterized by a significant increase in the recovery of fine particle mineral flotation.

In the technical solution of the present invention, the mixing drum 2 is connected to the side wall of the mixing drum 2 with a feeding pipe 3, and the lower end of the first stirring rod 6 extends from the top end of the mixing drum 2 into the mixing drum 2 The guide rod 4, the upper high-speed stirring impeller 5 and the lower high-speed stirring impeller 7 are fixedly mounted from the top to the bottom on the first stirring rod 6 located in the mixing drum 2; the first stirring rod located outside the mixing drum 2 The upper end of the mixing drum 2 is fixed with a first pulley 1; on one side of the mixing drum 2, a flotation groove 16 is provided, and at the upper end of the side wall of the flotation groove 16, a foam overflow port 15 is formed, and the height of the foam overflow port 15 is formed. Below the height of the feed pipe 3, a slag discharge pipe 17 is connected to the lower end of the flotation tank 16, and a microbubble generator 18 is mounted on the inner wall of the bottom end of the flotation tank 16, as shown in Fig. 1, the mixing drum 2 The outer wall can be used as a part of the side wall surrounding the flotation cell 16 so that the flotation cell 16 forms a container with an open upper end, and the small diameter elbow 14 is bent to form an "L shape" and is located in the flotation cell 16, small One end of the diameter elbow 14 is in communication with the mixing drum 2, and the port at the other end faces upward; a rotating machine is disposed above the upwardly facing port of the small diameter elbow 14 The rotating mechanism comprises: a fixed block 10, a second pulley 11, a second stirring rod 12 and a low-speed stirring impeller 13, the fixing block 10 is fixedly fixed to one end of a supporting rod 9, and the other end of the supporting rod 9 is connected with the mixing drum 2 The outer wall is fixed, and the second stirring rod 12 is vertically fixed at the lower end of the fixing block 10, and the second pulley 11 and the low-speed stirring impeller 13 are fixedly mounted from the top to the bottom on the second stirring rod 12, wherein the low-speed stirring impeller 13 is located in the flotation cell 16 for uniformly distributing the slurry discharged from the upwardly facing port of the small diameter elbow 14 in the flotation cell 16. A corrugated lining 8 is laid on the inner wall of the lower end of the mixing drum 2, and the highest point of the wavy lining 8 is not higher than the height of the upper high-speed stirring impeller 5.

In order to verify the recovery rate of the cyclone and the two-stage flow field fine particle flotation equipment of the present invention, quartz and hematite pure minerals are taken, and artificial mixed minerals are prepared according to quartz: hematite = 1:1, and the mixed minerals are TFe. The grade is 33.78%. Under the condition of pH 7, glutinous corn starch dosage 4mg/L and sodium oleate dosage 300mg/L, the traditional hanging trough flotation machine (Wuhan Prospecting Machinery Factory, model: XFGIl50～100) The test is carried out separately with the two-stage flow field fine particle flotation equipment of the present invention. The test results are shown in Table 1.

Table 1 Comparison results of artificial mixed ore flotation

In the traditional hanging trough flotation machine, iron concentrate with a grade of 52.38% and a recovery rate of 59.14% was obtained. In the cyclone combined two-stage flow field fine particle flotation equipment, the grade was 52.54% and the recovery rate was 63.87%. Iron concentrate. Compared with the traditional hanging trough flotation machine, the recovery rate of the static-static combined two-stage flow field fine particle flotation equipment of the present invention is improved by 4.73% under the premise of ensuring the iron concentrate grade.

The above is only a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any person skilled in the art is within the technical scope of the present invention; the technical solution according to the present invention Equivalent replacements or changes to the present invention are intended to be included within the scope of the present invention.

Claims

A rotary static combined two-stage flow field fine particle flotation device, comprising a mixing drum (2), characterized in that: a feeding pipe (3) is connected to an upper end side of the mixing drum (2), the stirring A first stirring rod (6) is inserted into the upper end of the cylinder (2), and the first stirring rod (6) is mounted on the mixing drum (2) through a bearing, and the first stirring rod (6) is mounted with the first a pulley (1), and the first pulley (1) is located on the upper side of the mixing drum (2), and the inner side of the mixing drum (2) is provided with a guide tube (4) and an upper high-speed stirring impeller from the top to the bottom ( 5) and the high-speed stirring impeller (7), and the draft tube (4), the upper high-speed stirring impeller (5) and the lower high-speed stirring impeller (7) are both connected to the first stirring rod (6), the mixing drum a corrugated lining (8) is fixedly connected to the inner bottom of (2), and a flotation tank (16) is connected to one side of the mixing drum (2), and the flotation tank (16) is away from the mixing drum (2). A slag discharge pipe (17) is connected to one side, a small diameter elbow (14) is connected to a lower end side of the mixing drum (2), and a small diameter elbow (14) extends away from one end of the mixing drum (2) to In the flotation tank (16), the small diameter elbow (14) is rotated away from the upper side of one end of the mixing drum (2). a rotating mechanism comprising a fixed block (10), a second pulley (11), a second stirring rod (12) and a low-speed stirring impeller (13), and a supporting rod (9) is connected to the fixing block (10) And the fixing block (10) is connected to the mixing drum (2) through a support rod (9), the second stirring rod (12) is rotatably coupled to the lower end of the fixing block (10), the second pulley (11) and The low-speed stirring impeller (13) is connected to the second stirring rod (12), and the second pulley (11) is located at the upper end of the low-speed stirring impeller (13), and the upper end of the flotation tank (16) is connected with a foam overflow The mouth (15), and the foam overflow port (15) is located between the second pulley (11) and the low speed stirring impeller (13), and the bottom of the flotation tank (16) is connected with a microbubble generator (18).
A static-static combined two-stage flow field fine particle flotation apparatus according to claim 1, characterized in that the height of the mixing drum (2) is higher than the foam overflow (15).
A static-static combined two-stage flow field fine particle flotation apparatus according to claim 1, wherein the outer side of the small-diameter elbow (14) is coated with a waterproof layer.
The invention relates to a rotary static combined two-stage flow field fine particle flotation device according to claim 1, characterized in that: the inside of the mixing drum (2) is provided with a corrugated liner (8), and the corrugated liner (8) Laying at the lower end of the mixing drum (2), and the height of the corrugated liner (8) does not exceed the upper high-speed stirring impeller (5).
A static-static combined two-stage flow field fine particle flotation apparatus according to claim 3, wherein the distance between the upper high-speed stirring impeller (5) and the lower high-speed stirring impeller (7) is not more than The distance between the low speed agitating impeller (13) and the lower high speed agitating impeller (7).