CN110064498B

CN110064498B - Hydraulic separation method for improving cleanliness of quartz sand

Info

Publication number: CN110064498B
Application number: CN201910363475.XA
Authority: CN
Inventors: 熊帆; 赵辉; 王德春; 李曙光
Original assignee: Changjiang Moulding Materials Group Kezuo Houqi Co ltd
Current assignee: Changjiang Moulding Materials Group Kezuo Houqi Co ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2022-03-11
Anticipated expiration: 2039-04-30
Also published as: CN110064498A

Abstract

The invention belongs to the technical field of quartz sand processing, and particularly discloses a hydraulic separation method for improving quartz sand cleanliness, which is used for separation in a separation box and comprises the following steps: continuously introducing clean water into the sorting box, wherein the water flow direction of the clean water faces upwards; mixing quartz sand particles with clean water to form a sand-water mixture, and mixing the sand-water mixture at a ratio of 100M³/H‑300M³The flow of the/H is introduced into the separation box from the side wall of the separation box; ultrasonic acting force is given to the quartz sand particles in the sorting box through an ultrasonic generator, and the frequency of the ultrasonic generator is 28KHz-42 KHz; and after the separation is finished, discharging and collecting the quartz sand particles in the separation box. The process can meet the requirement of cleaning during quartz sand separation.

Description

Hydraulic separation method for improving cleanliness of quartz sand

Technical Field

The invention belongs to the technical field of quartz sand processing, and particularly relates to a hydraulic separation method for improving the cleanliness of quartz sand.

Background

At present, the domestic production process of the quartz sand mainly comprises the following steps: the method comprises the following steps of mining, crushing, cleaning, drying, sorting and the like, wherein the sorting is generally carried out by adopting a vibration screening machine, a plurality of layers of screening plates are arranged in the vibration screening machine, namely, each layer of screening plate is screened according to the set granularity to obtain quartz sand with different granularities (meshes), but the screening mode has many problems, namely, the granularity of the firstly sorted quartz sand is not uniform, and some fine particles are easy to mix in larger sand grains, so that the granularity distribution of finished sand products cannot reach the standard due to different meshes of the screened standard sand; secondly, during the working process of the vibrating screen machine, a large amount of dust is generated due to the impact between sand grains or between the sand grains and the screen plate, the main component silicon dioxide of the dust has great health threat to human bodies, if the vibrating screen is not tightly sealed, the dust can fly around in a production area, the separated sand grains need to be further cleaned, and finally, due to the fact that the sand grains continuously impact the screen plate of the vibrating screen during the separation process, the durability of the screen plate is reduced, and the screen plate needs to be replaced after being used for a period of time. Therefore, the method of adopting the vibration screening is only suitable for the production of small batches.

In the conventional process flow of the quartz sand, the crushed sand needs to be cleaned and dried before separation, so that the production process is longer and is not suitable for enterprises with higher quartz sand yield.

Disclosure of Invention

The invention aims to provide a hydraulic separation method for improving the cleanliness of quartz sand, so as to meet the requirement of improving the cleanliness of the quartz sand in the separation process.

In order to achieve the purpose, the basic scheme of the invention is as follows: a hydraulic separation method for improving the cleanliness of quartz sand is used for separation in a separation box and comprises the following steps:

step A, introducing a sand-water mixture

Mixing quartz sand particles with clean water to form a sand-water mixture, and mixing the sand-water mixture at a ratio of 100M³/H-300M³The flow of the/H is introduced into the separation box from the side wall of the separation box;

step B, ultrasonic cleaning

Ultrasonic acting force is given to the quartz sand particles in the sorting box through an ultrasonic generator, and the frequency of the ultrasonic generator is 28KHz-42 KHz;

step C, finishing the sorting

And after the separation is finished, discharging and collecting the quartz sand particles in the separation box.

The theory of operation and the beneficial effect of this basic scheme lie in:

1. in the step B, carry the sand-water mixture to the separation box in through rivers effect, compare and directly use the conveyer belt to convey the quartz sand to the separation box in, utilize rivers effect to carry quartz sand in this application, can reduce the kinetic energy that the quartz sand enters into the separation box, avoid the initial kinetic energy of quartz sand to influence the separation effect.

2. If sand particles impact on the side wall of the separation box, mud powder attached to the sand particles can further fall off in the collision process, and dust cannot fly in water, so that the processing environment is greatly improved.

3. Under the effect of water conservancy separation, the sand grain suspension is in the separation intracavity, and along with hydraulic action, sand grain continuous motion can have certain cleaning performance, and further add supersonic generator in the step C and carry out ultrasonic cleaning, the ultrasonic wave that supersonic generator produced passes through the rivers effect on quartz sand granule, make the adnexed mud powder of quartz sand granule surface drop, because the shape of quartz sand granule is irregular, the mud powder in less gap only passes through the difficult sanitization of rivers effect, use the ultrasonic wave to wash, make the cleanliness factor of quartz sand granule higher. Compare and directly carry out ultrasonic cleaning in the aquatic of stewing, utilized the effect of water conservancy separation in this application for the cleaning performance is better.

Compared with the vibration screening in the prior art, the process sorts in water, completes cleaning in water simultaneously, omits drying steps, integrates sorting and cleaning steps, and greatly improves processing efficiency.

And further, in the step A, a plurality of partition plates are arranged in the sorting box, and the sorting box is divided into a plurality of parallel sorting cavities by the partition plates.

Has the advantages that: the movement of the sand-water mixture in the horizontal direction is blocked by the partition plates, so that the movement speed of the sand-water mixture in the horizontal direction is reduced, the sedimentation rate of the quartz sand in the separation cavity is increased continuously, the quartz sand with different granularities can be separated in different separation cavities, and the refined separation is realized.

Further, the deck height is 1/2-3/4 of the sort bin height.

Has the advantages that: because rivers can receive blockking of baffle when a plurality of sorting intracavity flow to reduce the velocity of flow of rivers horizontal direction, and the height of baffle is higher, and the influence reduction effect to the velocity of flow of rivers is more obvious. The top of injecing the baffle is apart from the interval at separation box top, avoids highly crossing low of baffle, and rivers can cross the separation effect that the baffle leads to not good easily, also avoids the high too high of baffle, and the velocity of flow of rivers reduces too greatly in every separation intracavity, is difficult to drive the quartz sand granule and overturns the baffle.

Further, the baffle includes fixed part and sliding part, welds the fixed part in the separation box, with sliding part sliding connection in the separation box.

Has the advantages that: through the slip of drive sliding part, can change the height of baffle, the height of baffle is higher, and is more obvious to the effect that blocks of horizontal direction rivers, through the height of adjustment baffle, can adjust the water resistance of horizontal direction for the granularity that quartz sand was selected separately is more accurate.

Further, in the step A, a plurality of partition boards with different heights are prepared, and the partition boards are detachably connected into the sorting box.

Has the advantages that: by disassembling the partition board, the partition boards with different heights can be replaced. Compare the slip mode of baffle, the mode of can dismantling the connection is though it is more troublesome to change, nevertheless need not set up the driving piece, and device overall structure is more simplified.

Further, in the step B, the ultrasonic generator is started intermittently, and the starting time interval of the ultrasonic generator is 2-4 s.

Has the advantages that: when sand grains are continuously acted by ultrasonic waves and water flow, the resultant force of the sand grains with the same granularity in the sorting cavity is constant, after the ultrasonic generator is suddenly turned off, the acting force of the sand grains is reduced by one, the original resultant force of the sand grains is broken, the motion trail of the sand grains is changed to a certain extent, the ultrasonic generator is suddenly turned on again, the motion trail of the sand grains is recovered again, in the process, the sand grains vibrate to a certain degree, and the cleaning effect of the sand grains is good.

Further, in the step B, the ultrasonic generator is arranged on the sorting cavity close to one side of the feeding direction of the sand-water mixture.

Has the advantages that: since the quartz sand in the separation chamber on the side close to the sand-water mixture feeding direction is not cleaned and the amount of the attached sludge powder or fine powder is large, it is preferable to arrange the quartz sand in the separation chamber on the side close to the sand-water mixture feeding direction when the number of the ultrasonic generators is limited in view of cost saving.

Further, in the step A, the content of quartz sand in the sand-water mixture is not more than 50%.

Has the advantages that: the sand grains are prevented from being too much in proportion, namely the sand grains are too dense and are difficult to be well dispersed in the separation cavity for separation.

Furthermore, the sorting cavities are all cuboid.

Has the advantages that: compared with a cylindrical shape or an irregular shape, the blocking effect of the partition plate on the sand-water mixture in the horizontal direction is uniform, the sand-water mixture in each sorting cavity moves for the same distance (namely the length of the sorting cavity) in the horizontal direction and then contacts the partition plate, namely the movement rate consumption of the sand-water mixture before contacting the partition plate is basically consistent, and the sand grain size in the sorting cavity tends to be consistent.

Further, the ultrasonic generator is arranged at the bottom of the sorting cavity.

Has the advantages that: the sand grains settle down and stay in a certain position of the bottom of the separation cavity easily, the ultrasonic generator is arranged at the bottom of the separation box, the water flow at the bottom of the separation box has the most obvious ultrasonic effect, the vibration of the water flow is the most obvious, and the sand grains can be discharged more conveniently to a certain degree.

Drawings

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention;

FIG. 2 is a front cross-sectional view of the water supply pipe and the water spray disk of FIG. 1;

FIG. 3 is a partial cross-sectional view of example 10 of the present invention;

fig. 4 is an enlarged view of a portion a in fig. 3.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the sand cleaning device comprises a separation box 1, a separation cavity 2, a sand inlet 3, a partition plate 4, a sand discharge port 5, a header pipe 6, a water supply pipe 7, a water spray disk 8, a water cavity 9, a water spray hole 10 and a sand cleaning pipe 11.

A hydraulic sorting method for improving the cleanliness of quartz sand, wherein parameters related to examples 1 to 9 are shown in Table 1:

TABLE 1

In the table, the sorting cavities 1-4 and 5-8 refer to: in the embodiment, 8 sorting cavities are arranged in the sorting box and are used as an example for explanation, the 8 sorting cavities are numbered, and the sorting cavities from the side close to the sand inlet to the side far away from the sand inlet are numbered in sequence as 1-8. The starting time interval of the ultrasonic generator is 0, which means that the ultrasonic generator is continuously started.

The following will illustrate a hydraulic separation method for improving the cleanliness of quartz sand according to the present invention, taking example 4 as an example.

Example 4

A hydraulic separation method for improving the cleanliness of quartz sand comprises the following steps:

A. preparation device

A sorting box 1 with the length of 6.4m, the width of 1.5m and the height of 1.5m is prepared, a sand inlet 3 is arranged on the right side of the sorting box 1, and a sand outlet is arranged on the left side of the sorting box 1. Prepare the baffle 4 of polylith height difference to satisfy in this application to the requirement of 4 co-altitude of baffle, in this embodiment, along the high 1 m's of horizontal installation polylith baffle 4 in sorting box 1, the height of baffle 4 is the 2/3 of sorting box 1 height promptly, and is concrete, in this embodiment, sets up vertical draw-in groove in sorting box 1, and 4 joints of baffle are in the draw-in groove, conveniently change baffle 4. In addition, baffle 4 also can adopt gliding mode to connect in order to change the height of baffle 4 in separation box 1, and is concrete, and baffle 4 includes fixed part and sliding part, and the fixed part welding is equipped with the gliding spout of confession sliding part in separation box 1, and separation box 1 internal fixation has the cylinder, and cylinder output shaft and sliding part fixed connection can drive the sliding part through the cylinder and slide from top to bottom in order to change the height of baffle 4.

The separation box 1 is divided into a plurality of separation cavities 2 in a rectangular shape by the partition plates 4, and the bottom of each separation cavity 2 is provided with a sand discharge port 5. In this embodiment, 8 sorting chambers 2 are taken as an example, and the sorting chambers 2 from the side close to the sand inlet 3 to the side far away from the sand inlet 3 (i.e., from right to left in fig. 1) are numbered sequentially as 1 to 8, and each sorting chamber 2 is rectangular and has a uniform volume.

B. Clean water is introduced

And (2) introducing clean water to the bottom of each sorting cavity 2, specifically, selecting a plurality of water supply pipes 7 with the pipe diameters of 20-30cm, installing a plurality of water supply pipes 7 in each sorting cavity 2, wherein the pipe diameters of the plurality of water supply pipes 7 in each sorting cavity 2 are consistent, and the pipe diameters of the water supply pipes 7 in different sorting cavities 2 can be inconsistent. The water supply pipe 7 is inserted vertically upwards into the bottom of the sorting chamber 2 and extends into the sorting chamber 2, i.e. the water supply pipe 7 is fixed at the bottom of the sorting chamber 2.

The upper end of the water supply pipe 7 is fixed with a water spray disk 8, a water cavity 9 communicated with the water supply pipe 7 is arranged in the water spray disk 8, as shown in a combined figure 2, a plurality of water spray holes 10 communicated with the water cavity 9 are uniformly distributed on the side wall of the water spray disk 8 along the circumferential direction, and one end, far away from the axis of the water spray disk 8, of each water spray hole 10 inclines upwards. The upper end of the water spraying disc 8 is in an upward convex arc shape.

Many water supplies in every separation chamber 2 feed through on a house steward 6, with house steward 6 and water pump intercommunication, inject into delivery pipe 7 through water pump extraction clear water in, and then inject into and select separately in chamber 2, because the delivery pipe 7 pipe diameter of every separation chamber 2 is unanimous and through same water pump water supply, can guarantee that many delivery pipes 7 in every separation chamber 2 supply water flow unanimous.

The flow rate of the clean water injected into the sorting cavities 1-4 is 40T/H, the flow rate of the clean water injected into the sorting cavities 5-8 is 9T/H, and the flow rate of the injected clean water is the sum of the water supply flow rates of the plurality of water supply pipes 7 in each sorting cavity 2.

The rivers direction orientation that continuously lets in clear water and clear water, the quartz sand receives the effect of rivers to disperse in the separation box, and the suspension receives continuous ascending water scouring effect simultaneously in water, realizes the washing to the sand grain, consequently adopts this technical scheme to need not to wash quartz sand and dry step before the separation, very big production process flow that has shortened quartz sand, very big improvement the efficiency of quartz sand production.

Step C, introducing a sand-water mixture

Mixing quartz sand particles with clear water to form a sand-water mixture with a sand-water ratio of 35.2%; and the sand-water mixture is introduced into the separation box 1 through the sand inlet 3 at a flow rate of 100M 3/H.

Step D, ultrasonic cleaning

An ultrasonic generator is arranged at the bottom of each sorting cavity 2, the type of the ultrasonic generator in the embodiment is Komada/KMD-28, the frequency of the ultrasonic generator below the sorting cavities 1-4 is 35KHz, and the frequency of the ultrasonic generator below the sorting cavities 5-8 is 28 KHz. The ultrasonic generator was started intermittently every 2 s.

Step E, finishing the sorting

After sorting is completed, the quartz sand particles in each sorting chamber 2 are discharged and collected.

Examples 1 to 3, 5 to 9 and 4 differ only in the parameters of Table 1.

Example 10

The parameter settings of this embodiment are completely the same as those of embodiment 4, and the difference between this embodiment and embodiment 4 is only that the structure of the water spray disk 8 used in step B is different. Specifically, as shown in fig. 3 and 4, the water spray disks 8 are rotatably connected to the water supply pipe 7, the water spray holes 10 on the same water spray disk 8 are all obliquely arranged along the same direction of the circumference of the water chamber 9, and the water flow is discharged from each water spray hole 10 through the water chamber 9, and the water spray disk 8 is pushed in a counterclockwise (or counterclockwise) direction of the water flow, so that the water flow rotates. Be equipped with the sand cleaning hole in the 8 bottoms of spray disk, for the reposition of redundant personnel that reduce the sand cleaning hole, the sand cleaning hole only is equipped with one in this embodiment, has sand cleaning pipe 11 in sand cleaning hole department bonding, and sand cleaning pipe 11 is the rubber tube in this embodiment, and sand cleaning pipe 11's export is towards the root of delivery pipe 7.

Because the bottom of each separation chamber 2 all sets up to the toper that carries out the water conservancy diversion to the sand grain, consequently the sand grain can flow along the bottom of separation chamber 2 and discharge from sand discharge port 5, and this in-process, some sand grains can be piled up at the root of delivery pipe 7 for this part of sand grain can't be discharged, consequently sets up the sand removal hole in the bottom of water cavity 9, and the sand removal hole is discharged can be followed to the partial clear water in water cavity 9, thereby acts on the root at delivery pipe 7, washes away the sand grain of this department. Thus, the clean water discharged from the sand cleaning hole through the sand cleaning pipe 11 can directly wash the root of the water supply pipe 7, and the sand accumulated at the root of the water supply pipe 7 can be washed away.

And E, after the sorting is finished in the step E, detecting the average granularity (unit: mesh) of the quartz sand particles discharged from each sorting cavity by using a granularity detector, wherein the average granularity is calculated by selecting 5 detection results (the detection results are averaged), then averaging, and rounding the average value according to a rounding mode. The results are shown in table 2:

TABLE 2

The following can be concluded from table 2:

1. examples 1-3 and 8-9 all change the horizontal movement of the sand-water mixture, examples 1-3 increase the horizontal resistance by increasing the height of the partition plate, examples 8-9 increase the horizontal rate by increasing the injection flow rate of the sand-water mixture, and examples 8-9 can obtain: the movement rate of the quartz sand in the horizontal direction is increased, the sedimentation rate of the quartz sand in the separation cavity is reduced, the granularity of quartz sand particles left in the separation cavity is gradually increased, and the granularity difference between adjacent separation cavities is reduced, namely the separation is more refined; by comparing examples 1-3 with examples 8-9, the particle size of the quartz sand remaining in the separation chamber is significantly increased (example 1 reduces the resistance) or decreased (example 3 increases the resistance), indicating that the horizontal force has a large influence on the separation.

2. Through examples 4-7, it can be seen that changing the frequency and the start-up time interval of the ultrasonic generator has little effect on the particle size of the sorted quartz sand, and the sorted sand particles are significantly cleaner.

3. The difference between the sizes of the sand grains selected in the sorting cavity 4 and the sorting cavity 5 is large because the sand grains are divided into two groups, namely the sorting cavity 1-4 and the sorting cavity 5-8, in the design parameter (flow rate of the introduced clean water), and if the actual situation allows, the parameters in each sorting cavity can be adjusted, which is not described in the embodiment.

4. The result of the separation in example 10 shows that the change of the structure of the water spray disk has little influence on the particle size of the separation, but the change of the structure of the water spray disk obviously shows that the accumulation of the sand particles at the bottom of the separation cavity is improved when the sand particles are discharged, and the sand particles are more conveniently discharged.

In conclusion, the detection results show that the injection flow rate of the injected sand-water mixture and the height of the partition plate have great influence on the granularity sorting of the quartz sand, and when the granularity requirements of the quartz sand are different, the sorting of different granularities can be realized by adjusting two parameters of the injection flow rate of the injected sand-water mixture and the height of the partition plate.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims

1. A hydraulic separation method for improving the cleanliness of quartz sand is characterized in that separation is carried out in a separation box, and the method comprises the following steps:

step A, introducing a sand-water mixture

Mixing quartz sand particles with clean water to form a sand-water mixture, and introducing the sand-water mixture into the sorting box from the side wall of the sorting box at a flow rate of 100M3/H-300M 3/H;

step B, ultrasonic cleaning

The ultrasonic generator gives ultrasonic acting force to the quartz sand particles in the sorting box, the ultrasonic generator is started intermittently, and the frequency of the ultrasonic generator is 28KHz-42 KHz;

step C, finishing the sorting

After the separation is finished, discharging and collecting the quartz sand particles in the separation box;

in the step A, a plurality of partition plates are arranged in the sorting box, and the partition plates divide the sorting box into a plurality of parallel sorting cavities; the partition plate comprises a fixed part and a sliding part, the fixed part is welded in the sorting box, and the sliding part is connected in the sorting box in a sliding manner; a plurality of water supply pipes are arranged in each sorting cavity, a water spray disc is rotatably connected to each water supply pipe, and a plurality of water spray holes are formed in the side wall of each water spray disc in an inclined mode along the circumferential direction; the bottom of the water spray disk is provided with a sand cleaning hole, a sand cleaning pipe is bonded at the sand cleaning hole, and the outlet of the sand cleaning pipe faces to the root of the water supply pipe.

2. The hydraulic sorting method for improving quartz sand cleanliness according to claim 1, wherein said partition height is a sort bin height of 1/2-3/4.

3. The hydraulic sorting method for improving the cleanliness of quartz sand according to claim 2, wherein: and in the step A, preparing a plurality of partition plates with different heights, and detachably connecting the partition plates in the separation box.

4. The hydraulic separation method for improving the cleanliness of quartz sand according to claim 1, wherein the hydraulic separation method comprises the following steps: in the step B, the starting time interval of the ultrasonic generator is 2-4 s.

5. The hydraulic separation method for improving the cleanliness of quartz sand according to claim 1, wherein the hydraulic separation method comprises the following steps: in the step B, the ultrasonic generator is arranged on the sorting cavity close to one side of the feeding direction of the sand-water mixture.

6. The hydraulic separation method for improving the cleanliness of quartz sand according to claim 1, wherein the hydraulic separation method comprises the following steps: in the step A, the content of quartz sand in the sand-water mixture is not more than 50%.

7. The hydraulic separation method for improving the cleanliness of quartz sand according to claim 1, wherein the hydraulic separation method comprises the following steps: the sorting cavities are all cuboid.

8. The hydraulic sorting method for improving the cleanliness of quartz sand according to claim 5, wherein: the ultrasonic generator is arranged at the bottom of the sorting cavity.