CN110252507B

CN110252507B - Kaolin desanding process

Info

Publication number: CN110252507B
Application number: CN201910626644.4A
Authority: CN
Inventors: 陈福亮; 黄少聪; 李荣森
Original assignee: Fujian New Han And Tang Nonmetallic Material Co ltd
Current assignee: Fujian New Han And Tang Nonmetallic Material Co ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2021-09-24
Anticipated expiration: 2039-07-11
Also published as: CN110252507A

Abstract

The invention discloses a kaolin desanding process, and relates to the technical field of kaolin production. The technical key points are as follows: a kaolin desanding process comprises the following steps: spraying water to the surface of kaolin to form ore pulp and flowing the ore pulp into a pulp dissolving tank; stirring the ore pulp to a stirring tank by adopting a stirring paddle, and fully stirring the ore pulp in the stirring tank; step three, feeding the uniformly stirred ore pulp into a plurality of hydrocyclones connected in parallel, and feeding the overflow slurry into an iron removal process; and fourthly, enabling the underflow of the hydrocyclone to enter a rotary vibration screen for secondary screening, conveying the slurry passing through the screen to an iron removal process, and discharging impurities on the screen out of the rotary vibration screen through vibration. The invention has the advantages of high screening efficiency and difficult waste of ore pulp.

Description

Kaolin desanding process

Technical Field

The invention relates to the technical field of kaolin production, in particular to a kaolin desanding process.

Background

Kaolin is a non-metallic mineral product, mainly composed of kaolinite, mica, residual feldspar and quartz, and is a clay and claystone mainly made of kaolinite clay minerals. The main component of kaolin is mainly silicate mineral containing aluminum, and the particles are fine, white and fine. Kaolin has wide application, is mainly used for paper making, ceramics and refractory materials, is used for coating, rubber filler, enamel glaze and white cement raw materials, and is used for industrial departments such as plastics, paint, pigment, grinding wheels, pencils, daily cosmetics, soap, pesticide, medicine, textile, petroleum, chemical industry, building materials, national defense and the like in a small amount.

The invention discloses a kaolin purification and magnetic separation process in Chinese patent with publication number CN106944254A, which utilizes a magnetic separator to remove iron impurities in kaolin ore pulp, and is characterized by comprising the following steps: (1) dispersing: adding a dispersing agent into kaolin ore pulp to fully disperse the ore pulp; (2) removing impurities: removing impurities from the ore pulp subjected to the pre-dispersion treatment in the step (1) by using a vibrating screen; (3) magnetic separation: and (3) moving a separation cavity of the magnetic separator into a magnetic field, feeding the ore pulp subjected to impurity removal in the step (2) into the separation cavity, performing magnetic separation impurity removal, stopping feeding the ore pulp after the ore pulp feeding is finished, starting to eject the ore pulp, ejecting the ore pulp in the separation cavity by using water, moving the separation cavity out of the magnetic field for cleaning after the ore pulp ejecting is finished, moving the separation cavity into the magnetic field for magnetic separation after the cleaning is finished, and performing circular operation.

Above-mentioned patent only adopts the shale shaker edulcoration when the edulcoration, because the sieve mesh diameter of shale shaker is less, when output increase, the flow of ore pulp also can grow thereupon, piles up the ore pulp of not screening completely on the shale shaker easily, and the ore pulp of partial not screening completely even can be followed and arranged the sand mouth and discharged, causes the waste of ore pulp.

Disclosure of Invention

The invention aims to provide a kaolin desanding process which has the advantages of high screening efficiency and difficulty in wasting ore pulp.

In order to achieve the purpose, the invention provides the following technical scheme:

a kaolin desanding process comprises the following steps:

spraying water to the surface of kaolin to form ore pulp and flowing the ore pulp into a pulp dissolving tank;

stirring the ore pulp to a stirring tank by adopting a stirring paddle, and fully stirring the ore pulp in the stirring tank;

step three, feeding the uniformly stirred ore pulp into a plurality of hydrocyclones connected in parallel, and feeding the overflow slurry into an iron removal process;

and fourthly, enabling the underflow of the hydrocyclone to enter a rotary vibration screen for secondary screening, conveying the slurry passing through the screen to an iron removal process, and discharging impurities on the screen out of the rotary vibration screen through vibration.

Through adopting above-mentioned technical scheme, can flow to the change thick liquid pond naturally behind the kaolin water spray, the stirring rake can make the kaolin of complete dissolution not broken, and can get into the stirring pond fast, after the ore pulp gets into hydrocyclone, under the centrifugal force effect, the ore pulp that contains less particulate matter is rotatory to flow to the deironing process along with the secondary vortex after certain degree, the grit that density is big and the dense solution of formation flow out the entering rotary vibrating screen from the bottom, the thick liquid through the screen cloth is sent to the deironing process, impurity on the screen cloth is through vibration discharge rotary vibrating screen. Because the treatment capacity of the hydrocyclone is large, the classification efficiency is high, and only a small amount of sand and concentrated solution enter the rotary vibration sieve, the treatment capacity of the rotary vibration sieve is reduced, the phenomenon that the ore pulp which is not completely sieved is discharged from the sand discharge port due to the fact that the ore pulp is accumulated on a screen of the rotary vibration sieve is avoided, and the waste of the ore pulp is reduced.

Further, the sieve that shakes soon includes base, spring, end fill and vibrating motor, the upper end level bending type of end fill is formed with the butt ring, the upper end of end fill is coaxial to be provided with keeps off the ring, the inner wall that keeps off the ring is provided with the spacing ring, the joint is provided with the screen cloth between butt ring and the spacing ring, keep off ring and end fill and can dismantle the connection through the clamp, keep off and have seted up the sand discharge mouth on the ring.

Through adopting above-mentioned technical scheme, the screen cloth is fixed through keeping off ring and spacing ring, when needing to be changed or wash the screen cloth, pulls down the clamp, takes out and keeps off the ring, can take out the screen cloth fast, improves work efficiency.

Further, the screen cloth includes fibre net, nylon cloth and the stainless steel net that sets gradually from last to down.

Through adopting above-mentioned technical scheme, because the sieve during operation that shakes soon, the fibre web can vibrate from top to bottom, and long-term and stainless steel mesh collision are out of shape easily, and nylon cloth both can play the cushioning effect, also can filter the ore pulp, reduce the frequency that the screen cloth was maintained or was changed, improve production efficiency.

Furthermore, the upper surface of fibre web is provided with the wire net rather than the laminating, the edge and the spacing ring of wire net or keep off ring fixed connection.

By adopting the technical scheme, the steel wire mesh provides downward pressure for the fiber net, the fiber net is prevented from jumping upwards and deforming, the service life of the fiber net is prolonged, the maintenance or replacement frequency of the fiber net is reduced, and the production efficiency is improved.

Furthermore, a guide plate is arranged on the inner wall of the baffle ring, and the guide plate is perpendicular to the plane where the fiber mesh is located and is located at the edge of the sand discharge port.

Through adopting above-mentioned technical scheme, grit and impurity of large granule receive the guide of guide plate, can in time discharge from row's sand mouth, avoid grit and impurity to pile up on the screen cloth.

Furthermore, a plurality of back flushing pipes are arranged below the bottom hopper and located below the stainless steel mesh, water outlets of the plurality of back flushing pipes face towards the stainless steel mesh, and valves are arranged on the plurality of back flushing pipes.

Through adopting above-mentioned technical scheme, after screen cloth work a period, the mesh of screen cloth can reduce screening efficiency because of blockking up, at this moment, makes high-pressure rivers wash to the stainless steel net from the recoil water pipe, and most impurity can break away from the mesh after receiving the recoil force, flows through sand discharge port from the surface of screen cloth, and at this moment, need not dismantle or change the screen cloth, shortens down time, improves production efficiency.

Furthermore, the delivery port of the backwash water pipe is hinged with a cover plate, and a torsional spring which enables the cover plate to tightly abut against the end face of the delivery port of the backwash water pipe is arranged on the periphery of the hinged shaft of the cover plate.

By adopting the technical scheme, when the screening work is carried out, the cover plate covers and is tightly attached to the backwashing water pipe, so that ore pulp is prevented from entering the backwashing water pipe, and when backwashing is needed, the cover plate is rotated and opened by high-pressure water, so that the backwashing work is not influenced.

Furthermore, one surface of the cover plate facing the stainless steel net is provided with a conical surface.

Through adopting above-mentioned technical scheme, when screening the during operation, when the ore pulp flowed into the end fill, the conical surface played the drainage effect, avoided the ore pulp to pile up on the apron.

Compared with the prior art, the invention has the beneficial effects that:

(1) the kaolin which is not completely dissolved is crushed by adopting the stirring paddle and can quickly enter the stirring pool, and the hydrocyclone and the rotary vibration sieve are matched for sieving, so that the treatment capacity of the rotary vibration sieve is reduced because the treatment capacity of the hydrocyclone is large and the classification efficiency is high, and only a small amount of sand and concentrated solution enters the rotary vibration sieve, thereby avoiding the phenomenon that ore pulp which is not completely sieved is discharged from a sand discharge port because the ore pulp is accumulated on a screen mesh of the rotary vibration sieve, and reducing the waste of the ore pulp;

(2) by arranging the steel wire mesh and the nylon cloth, the steel wire mesh provides downward pressure for the fiber net, the fiber net is prevented from being deformed due to upward jumping, the nylon cloth can play a buffering role, ore pulp can be filtered, the service life of the fiber net is prolonged, the maintenance or replacement frequency of the fiber net is reduced, and the production efficiency is improved;

(3) through setting up the backwash pipe, after screen cloth work a period, the mesh of screen cloth can reduce screening efficiency because of blockking up, at this moment, makes high-pressure rivers wash to the stainless steel net from the backwash pipe, and most impurity can break away from the mesh after receiving the recoil force, flows through the sand discharge port from the surface of screen cloth, and at this moment, need not dismantle or change the screen cloth, shortens down time, improves production efficiency.

Drawings

FIG. 1 is an overall view of the present embodiment;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic structural diagram of a back flushing pipe of the present embodiment;

fig. 5 is an enlarged view of a portion B in fig. 4.

Reference numerals: 1. a base; 2. a spring; 3. a bottom hopper; 4. a vibration motor; 5. a butting ring; 6. a baffle ring; 7. a limiting ring; 8. screening a screen; 81. a fiber web; 82. nylon cloth; 83. a stainless steel mesh; 9. clamping a hoop; 10. a sand discharge port; 11. steel wire mesh; 12. a baffle; 13. a backwash pipe; 14. a valve; 15. a cover plate; 16. a torsion spring.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

A kaolin desanding process comprises the following steps:

step three, sending the evenly stirred ore pulp into a plurality of hydrocyclones connected in parallel, wherein the number of the hydrocyclones is 4 in the embodiment, and sending the overflow slurry to an iron removal process;

and step four, enabling the underflow of the hydrocyclone to enter a rotary vibration sieve for secondary screening, conveying the slurry passing through the screen 8 to an iron removal process, and discharging impurities on the screen 8 out of the rotary vibration sieve through vibration.

As shown in fig. 1, the rotary vibration sieve comprises a base 1, a spring 2, a bottom hopper 3 and a vibration motor 4, wherein the bottom hopper 3 is located right above the base 1, the spring 2 is arranged in a plurality of positions along the circumferential direction of the bottom hopper 3 at equal intervals, the number of the positions is preferably 6 in the embodiment, two ends of the spring 2 are respectively fixedly connected with the base 1 and the bottom hopper 3, and the vibration motor 4 is located in the middle of the bottom surface of the bottom hopper 3 and is fixedly connected with the bottom hopper 3.

As shown in fig. 2 and 3, the upper end horizontal bending of the bottom hopper 3 is formed with a butt ring 5, the upper end of the bottom hopper 3 is coaxially provided with a baffle ring 6, the inner wall of the baffle ring 6 is provided with a limit ring 7, a screen mesh 8 is arranged between the butt ring 5 and the limit ring 7 in a clamping manner, the lower end horizontal bending of the baffle ring 6 is formed with a convex ring, the convex ring of the baffle ring 6 and the butt ring 5 of the bottom hopper 3 are detachably connected through a clamp 9, the inner wall of the clamp 9 can be provided with a sealing ring to improve the sealing performance, and a sand discharge port 10 is formed in the baffle ring 6.

The screen cloth 8 includes from last to down the fibre web 81, nylon cloth 82 and the stainless steel net 83 that set gradually, and the fibre web 81 adopts flexible fiber to make, and the upper surface of fibre web 81 is provided with the wire net 11 rather than the laminating, and the edge and the spacing ring 7 or the fender ring 6 fixed connection of wire net 11, the edge and the spacing ring 7 fixed connection of wire net 11 in this embodiment. The steel wire mesh 11 provides a downward pressure for the fiber mesh 81, the fiber mesh 81 is prevented from jumping upwards and deforming, the nylon cloth 82 can play a buffering role, ore pulp can be filtered, the service life of the fiber mesh 81 is prolonged, the maintenance or replacement frequency of the fiber mesh 81 is reduced, and the production efficiency is improved.

The inner wall of the baffle ring 6 is connected with a guide plate 12 through a screw, and the guide plate 12 is vertical to the plane of the fiber mesh 81 and is positioned at the edge of the sand outlet 10. Big grit and impurity of granule receive guide plate 12's guide, can in time discharge from row's sand mouth 10, avoid grit and impurity to pile up on screen cloth 8.

As shown in fig. 2 and 4, in order to reduce the frequency of replacing the screen mesh 8, the bottom hopper 3 is provided with a plurality of backwash water pipes 13 below the stainless steel mesh 83, in this embodiment, the backwash water pipes 13 are arranged in four and uniformly distributed, the water outlets of the backwash water pipes 13 face the stainless steel mesh 83, and the four backwash water pipes 13 are provided with valves 14. The screen 8 is washed through the back flushing pipe 13, the screen 8 does not need to be detached or replaced, the downtime is shortened, and the production efficiency is improved.

As shown in fig. 2 and 5, the water outlet of the backwashing pipe 13 is hinged with a cover plate 15, a torsion spring 16 for tightly abutting the cover plate 15 against the end surface of the water outlet of the backwashing pipe 13 is arranged on the periphery of a hinged shaft of the cover plate 15, when the screening work is performed, the cover plate 15 covers and tightly abuts against the backwashing pipe 13, so that ore pulp is prevented from entering the backwashing pipe 13, and when backwashing is required, the cover plate 15 is rotated and opened by high-pressure water without influencing the backwashing work. The surface of the cover plate 15 facing the stainless steel net 83 is provided with a conical surface, and the conical surface plays a role in drainage and prevents ore pulp from being accumulated on the cover plate 15.

The working process and the beneficial effects of the invention are as follows:

can flow to the slurry melting pond naturally behind the kaolin water spray, the stirring rake can make the kaolin of complete dissolution not broken, and can get into the stirring pond fast, after the ore pulp gets into hydrocyclone, under the centrifugal force effect, the ore pulp that contains less particulate matter is rotatory to be sent to the deironing process along with the vortex about the secondary after the certain degree, the grit that density is big and the concentrate that forms flow out from the bottom and get into the sieve that shakes soon, the thick liquid through screen cloth 8 is sent to the deironing process, impurity on the screen cloth 8 is through vibration discharge sieve that shakes soon. Because the treatment capacity of the hydrocyclone is large, the classification efficiency is high, and only a small amount of sand and concentrated solution enter the rotary vibration sieve, the treatment capacity of the rotary vibration sieve is reduced, the phenomenon that the ore pulp which is not completely sieved is discharged from the sand discharge port 10 due to the fact that the ore pulp is accumulated on the screen 8 of the rotary vibration sieve is avoided, and the waste of the ore pulp is reduced.

Vibrating motor 4 drives end fill 3 and the vibration of screen cloth 8 to make the ore pulp screening complete, lead to screening efficiency when lower when the screen cloth 8 because of blockking up, make high-pressure rivers wash to stainless steel net 83 from backwash water pipe 13, most impurity can break away from the mesh after receiving the recoil force, flow out through sand discharge port 10 from the surface of screen cloth 8, at this moment, need not dismantle or change screen cloth 8, shorten down time, improve production efficiency.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A kaolin desanding process is characterized by comprising the following steps:

fourthly, enabling the underflow of the hydrocyclone to enter a rotary vibration sieve for secondary screening, conveying the slurry passing through a screen (8) to an iron removal process, and discharging impurities on the screen (8) out of the rotary vibration sieve through vibration;

the rotary vibrating screen comprises a base (1), a spring (2), a bottom hopper (3) and a vibrating motor (4), wherein the upper end of the bottom hopper (3) is horizontally bent to form a butting ring (5), the upper end of the bottom hopper (3) is coaxially provided with a baffle ring (6), the inner wall of the baffle ring (6) is provided with a limiting ring (7), a screen (8) is clamped between the butting ring (5) and the limiting ring (7), the baffle ring (6) and the bottom hopper (3) are detachably connected through a hoop (9), and the baffle ring (6) is provided with a sand discharge port (10);

a plurality of back flushing pipes (13) are arranged below the stainless steel net (83) of the bottom hopper (3), water outlets of the back flushing pipes (13) face the stainless steel net (83), and valves (14) are arranged on the back flushing pipes (13);

a cover plate (15) is hinged to a water outlet of the backwashing pipe (13), a torsion spring (16) which enables the cover plate (15) to tightly abut against the end face of the water outlet of the backwashing pipe (13) is arranged on the periphery of a hinged shaft of the cover plate (15), and a conical surface is arranged on one surface, facing the stainless steel net (83), of the cover plate (15);

the screen (8) comprises a fiber net (81), nylon cloth (82) and a stainless steel net (83) which are arranged from top to bottom in sequence;

the upper surface of the fiber net (81) is provided with a steel wire mesh (11) attached to the fiber net, and the edge of the steel wire mesh (11) is fixedly connected with the limiting ring (7) or the baffle ring (6);

the inner wall of the baffle ring (6) is provided with a guide plate (12), and the guide plate (12) is perpendicular to the plane of the fiber net (81) and is positioned at the edge of the sand discharge port (10).