CN114522797A - Gravel-doped clay soil-stone separation method based on turbid liquid - Google Patents

Abstract

The invention belongs to the field of geotechnical tests, and relates to a soil-rock separation method, in particular to a gravel-doped clay soil-rock separation method based on turbid liquid. Pouring the gravel-doped clay fragments and clean water into a stirring device for mixing, wherein the stirring device adopts the initial slow stirring and the later high-speed stirring of turbid liquid; sending the stirred suspension into a vibrating screen device to separate mud-shaped objects and small-grained gravels, adopting a vibrating screen mud discharging and vibrating screen mode in the vibrating screen step, processing the separated clay to form dry clay without moisture, and airing the gravels for use. According to the gravel-doped clay soil-stone separation method provided by the invention, the clay and gravel in the gravel-doped clay blocks are separated by using a suspension-based method by utilizing the principle that soil is dissolved in water, so that not only can soil and stones be separated, but also gravel with various particle sizes can be screened, and gravel with the particle size of 0.075mm and gravel with the particle size of 53mm can be screened by repeating the steps.

Description

Gravel-doped clay soil-stone separation method based on turbid liquid

Technical Field

The invention belongs to the field of geotechnical tests, and relates to a soil-rock separation method, in particular to a gravel-doped clay soil-rock separation method based on turbid liquid.

Background

Gravel-doped clay as a mixed material for mixing gravel materials into natural viscous soil is widely used in the fields of hydraulic engineering, geotechnical engineering and the like, and gradually becomes a filling material for embankments, dams, landfill liners and other earthwork structures, and nowadays, the gravel-doped clay is mostly used in the core wall construction of core wall earth-rock dams in the field of hydraulic engineering

On the basis of the research on the tensile property of the gravel-doped clay, Yuanxina and the like in Qinghua university regard the gravel-doped clay as a four-phase composite material, a mesoscopic numerical model considering the real gravel form is established based on image processing and random putting, the effectiveness is verified by combining the result of a physical test, and the macro-mesoscopic property of the gravel-doped clay tensile fracture is analyzed. Zhang Hui et al of the university of river and sea uses a self-made test device to research the change rule of the tensile strength along with the dry density, the early consolidation pressure, the water content and the like of a sample; to 3 different gravels soils, the higher people of Jun Ju use the uniaxial tensile tester of development to compare and study its change law of tensile strength under different compaction work, saturation, moisture content. Based on an independently developed unidirectional tensile test device, Jien jumping et al of Nanjing Water conservancy science research institute researches the relationship between the tensile strength and the tensile strain of the core wall material along with the increase of the gravel content under the respective maximum dry density and the optimal water content of the sample; zhangzhitao et al independently developed a novel stretching device for soil body tensile test, developed the research to the gravel clay of different gravel contents, different fibre content. Therefore, the tensile properties of the gravel-doped clay are not much researched, and the tensile mechanical properties of the gravel-doped clay need to be deeply researched.

At present, in the field of geotechnical tests, the relevant research content of the gravel-doped clay is less, and the gravel-doped clay soil-rock separation method is almost not available. The conventional method needs manual separation, and has large workload and complicated procedure, so that an earth-rock separation device needs to be invented to replace the manual separation.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a gravel-doped clay soil-stone separation method based on suspension, which can reduce the recovery of clay and gravel to the maximum extent, ensure the repeated availability of raw materials and avoid the waste caused by discarding after the test is finished.

The invention adopts the following technical scheme

The invention relates to a gravel-doped clay soil-stone separation method based on turbid liquid, which comprises the following separation steps:

step one, pouring gravel-doped clay fragments and clean water into a stirring device for mixing;

firstly, crushing gravel-doped clay fragments before mixing the gravel-doped clay fragments with clean water; screening crushed gravel-doped clay fragments by adopting a manual primary screening mode to screen gravel-doped clay fragments with larger volume;

step one (2), the volume of the stirring device is V, the height of the stirring device is H, and the radius of the stirring device is R; adding the large and small gravel-doped clay fragments subjected to primary screening into the stirring device in a stopped state, wherein the filling height of the large and small gravel-doped clay fragments is 1/3H; adding clear water into the stirring device to enable the liquid level to reach 2/3H-3/4H;

step two, starting a telescopic rotating rod in the stirring device to stir so as to drive a hollow stirring paddle to fully stir the gravel-doped clay and the clear water; the stirring process is divided into: initial slow agitation: stirring the large and small gravel-doped clay fragments with clear water to form a suspension; and (3) high-speed stirring at the later stage: increasing the rotating speed to stir the preliminarily formed suspension;

step three, moving the stirring device after stirring to the upper part of the vibrating screen device; the height H 'and the radius R' of the vibrating screen device are respectively larger than the height H and the radius R of the stirring device;

placing screens with different apertures in multistage screen clamp grooves in the vibrating screen device, and sequentially placing the screens in the multistage screen clamp grooves from high to low according to the apertures of the screens;

step five, embedding the bottom end of the stirring device into the top end of the vibrating screen device, and releasing turbid liquid into the vibrating screen device from a discharge port at the bottom end of the stirring device; filtering the suspension by a screen mesh arranged from high to low; the outlet form at the bottom of the stirring device adopts a multi-opening door structure;

step six, in the process of releasing the suspension, the stirring device opens an L1cm gap on the bottom multi-open door structure, firstly, the suspension, the mud-like substances and the small-particle gravels in the mixture of the gravel-doped clay and the clear water fall into the vibrating screen device, and the operation is kept for 300 s; then continuing to open the gap to L2cm, wherein L2 is greater than L1, further enabling gravel particles to fall into a vibrating screen device, keeping for 250s, and finally opening to L3cm, L4cm and L5cm in sequence until the gravel particles are completely opened, wherein the gap is gradually increased when the gap is opened for the first time compared with the gap which is opened subsequently, and the keeping time is decreased;

step seven, vibrating the sieve to discharge mud and then vibrating the sieve:

step seven (1), after the step five is finished, opening a vibration sieve device to carry out vibration sieve on the gravel and the suspension, and promoting the gravel to be separated from clay attached to the gravel; then discharging the separated suspension through a sludge discharge valve in the vibrating screen device; filling clay suspension in a container;

step seven (2) opening a vibrating screen chassis to vibrate the remaining gravels with different grain diameters again, namely keeping a mud discharging valve open after discharging clay suspension, starting the vibrating screen device again, vibrating and screening the gravels on the screen meshes with different pore diameters again, vibrating and discharging the remaining suspension on the gravels to a container through the mud discharging valve;

step eight, standing the suspension in the container for 1 day for precipitation; a clear water layer appears above the precipitated suspension; skimming the clear water layer on the upper layer by using a water ladle to form a thick clay solution; pouring the thick clay solution into a baking pan, and keeping the height of the thick clay solution at 3 cm; baking the clay in an oven with the temperature of 105 ℃ for 36 hours to obtain dry clay without moisture;

step nine, drying and screening gravels with different particle sizes again: transferring the vibrating screen device to the upper part of the blowing device, and removing redundant moisture on gravel in the screen by adopting a weak wind shield; the weak wind gear temperature is 105 degrees: 10 min; and then, sequentially raising the wind speed gears at intervals of 10min until all gravels are dried.

The invention relates to a gravel-doped clay soil-stone separation method based on turbid liquid, which is characterized by comprising the following steps: the size of the gravel sieve preliminarily screened in the first step is as follows: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm, 37.5mm, 53.5 mm; and (3) sieving out all gravels with the particle sizes of 53mm, 37.5mm and 31.5mm and part gravels with the particle sizes of 19mm and 16mm from the gravel-doped clay fragments with larger volume by using an artificial primary sieve.

According to the gravel-doped clay soil-stone separation method based on the suspension, the initial stirring rotating speed of a telescopic rotating rod in the stirring device in the second step is 183 r/min; after the liquid level is stable, the rotating speed is increased to 366 r/min, and the stirring time is 5 min; increasing the rotating speed to 549 r/min again, and stirring for 5 min; finally, the rotating speed is increased to 732 r/min, and the stirring time is 5 min; if tiny bubbles appear on the liquid surface during the final stirring, the stirring time is prolonged.

According to the gravel-doped clay soil-stone separation method based on the turbid liquid, the telescopic rotary rod in the stirring device is stirred by adopting up-and-down motion in the initial stirring stage.

In the sixth step, the vibration frequency of the vibrating screen device is gradually increased from low to high, and the vibration frequency is respectively as follows: level 1: 37 times/min; level 2: 74 times/min; level 3: 111 times/min; level 4: 148 times/min;

if the liquid level of the suspension in the vibrating and screening device does not reach or only reaches 2/3H', the vibration frequency can be increased to level 4.

In the gravel-doped clay soil-stone separation method based on turbid liquid, the blowing gears of the blowing device in the eighth step are level 1, level 2, level 3 and level 4; the wind speed of each gear is respectively corresponding to the power as follows: 550W, 850W, 1000W and 1200W; the blowing temperature can be in the range of 0-300 degrees.

The gravel-doped clay soil-stone separation method based on the suspension comprises the third step of setting a screen mesh groove in the vibrating screen device to be 8 layers, and if the screen mesh in the screen mesh groove has the following apertures: when the 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm and 19mm are assembled, the 1.18mm screen is positioned at the lowermost layer to separate clay and gravel;

if the screen mesh in the screen mesh clamping groove has the following apertures: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm when assembling, firstly 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm carry out clay and gravel soil-stone separation according to the assembly from bottom to top, after the clay and gravel soil-stone separation is finished, take out the screen meshes with the aperture of 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm, move the screen mesh with the aperture of 2.36mm to the top layer of the screen mesh of the vibrating screen device, then place the screen meshes with the aperture of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm sequentially from bottom to top again.

Advantageous effects

(1) Due to the particularity of the clay, unlike the traditional separation of soil-stone mixtures in a dry separation mode, the method for separating the soil and the stone mixed with the gravel clay provided by the invention utilizes the principle that soil is dissolved in water, and provides a method for separating the clay and the gravel in the gravel-mixed clay block based on a suspension liquid.

(2) According to the gravel-doped clay soil and stone separation method provided by the invention, soil and stones can be separated, gravels with various particle sizes can be screened, and gravels with the particle sizes ranging from 0.075mm to 53mm can be screened by repeating the steps.

(3) The gravel-doped clay soil-stone separation method provided by the invention is a post-treatment method for any gravel-doped clay soil test, can reduce the recovery of clay and gravel to the maximum extent, ensures the repeated availability of raw materials, and avoids the waste caused by discarding after the test is finished.

Drawings

FIG. 1 shows a schematic diagram of the overall apparatus of the present invention:

in fig. 1a, a diagram of the state of adding gravel-doped clay lumps and clear water is shown.

In FIG. 1b, a schematic diagram of the state of the gravel-mixed clay lumps separated by activating the variable stirring rod based on FIG. 1a is shown.

In fig. 1c, a schematic view of the state in which the stirring apparatus is lifted on the basis of fig. 1b is shown.

In fig. 1d, a schematic view of the state of opening the multiple open door of the vibrating screen device on the basis of fig. 1c and putting the required screen mesh into the vibrating screen device is shown.

Fig. 1e is a schematic view showing a state where the rotary hydraulic rod is rotated in addition to fig. 1 d.

In fig. 1f, a schematic diagram of the state of fig. 1e is shown, in which the stirring device is applied to the vibrating screen device, and the gravel and clay suspension is poured into the vibrating screen device.

In fig. 1g, a schematic view of a state in which the sieving is performed on the basis of fig. 1f is shown.

In FIG. 1h, a schematic diagram of the state of resetting the stirring device based on FIG. 1g and pouring out the clay suspension is shown.

Fig. 1i shows a schematic diagram of a state that the vibrating screen device is rotated to the blowing device on the basis of fig. 1h to dry the inside and gravel.

Detailed Description

In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

As shown in fig. 1: the gravel-doped clay soil-stone separation method based on the suspension comprises the following steps.

Step one, pouring gravel-doped clay fragments and clean water into a stirring device, and specifically comprises the following steps:

step one (1), crushing the gravel-doped clay blocks and artificially primarily screening: the combination of 5KG tup and 200mm long steel nail is utilized, and the steel nail is stabilized above the gap or weak position of mixing gravel clay with the hand, squeezes in the steel nail with the tup and mixes gravel clay, thereby rocks the steel nail and releases mixing gravel clay structure. The loosened gravel-mixed clay blocks are taken down, and manually screened to screen a part of gravel with larger particle size and convenient picking and separation, so that the situation that the gravel is stuck in the stirring device when the variable stirring rod drives the hollow stirring paddle to rotate can be effectively prevented.

The pore size specification of a conventional gravel screen set: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm, 37.5mm, 53.5 mm. When some gravels with overlarge grain sizes are selected in the artificial primary screening, all gravels with the grain sizes of 53mm, 37.5mm and 31.5mm and a part of gravels with the grain sizes of 19mm and 16mm can be screened out basically.

Step one (2), adding gravel-doped clay fragments and clean water according to the volume of the stirring device: firstly, adding gravel-doped clay into the stirring device with the volume V, the height H and the radius R, wherein the adding height is about 1/3H; and adding clear water into the stirring device to enable the height of the mixture of the gravel-doped clay and the clear water to reach about 2/3-3/4H. The agitation device is then secured to the rotating oil hydraulic rod by a snap.

The order of placing the gravel-laden clay pieces and the clean water into the agitation apparatus cannot be reversed. The gravel-doped clay blocks should be placed first, and then the clear water should be placed, and if the clear water is placed first and then the gravel-doped clay blocks are placed, clay turbid liquid formed by dissolving the gravel-doped clay in the clear water in the stirring device can splash.

Step two, starting a telescopic rotating rod in the stirring device to stir so as to drive a hollow stirring paddle to fully stir the gravel-doped clay and clear water: the gravel-doped clay in the stirring device at the initial stirring stage is fast and large, and the direct use of the high-speed gear can cause the phenomena of unsmooth stirring and even splashing of clay turbid liquid. Therefore, the lowest gear is selected for stirring, so that the air in the clay is fully discharged when the larger gravel-doped clay is dissolved in water, and the clear water is fully immersed in the clay to form suspension preliminarily. After suspension is formed preliminarily, the liquid level of the mixture of gravel-doped clay and clear water can be lowered by a certain height due to the discharge of air in the clay, so that the rotating speed of the hollow stirring paddle is favorably improved further.

The telescopic rotating rod is firstly stirred by the lowest level 1 (the rotating speed is about 183 r/min), after the liquid level is stable, the rotating speed is increased to level 2 (the rotating speed is about 366 r/min) and stirred for 5min, and then the rotating speed is sequentially increased to level 3 (the rotating speed is about 549 r/min) and level 4 (the rotating speed is about 732 r/min), and the stirring is respectively carried out for 5 min. Only when the rotating speed of the hollow stirring paddle is gradually increased, the clay attached to the gravel can be fully dissolved in water, and a small amount of micro bubbles can float out of the liquid level at the moment. The stirring device stops after the telescopic rotating rod rotates and stirs until bubbles are not generated on the liquid surface, and if the bubbles are generated, the stirring time of the rotating speed level 4 (the rotating speed is about 732 r/min) of the hollow stirring paddle is properly prolonged.

At the initial stage of flexible rotary rod, in order to let mix the sufficient contact of the clay in the gravel clay piece and clear water and form the turbid liquid, can control flexible rotary rod and rise or descend to drive hollow stirring oar and rise or descend, maximum efficiency will mix gravel clay and stir. However, the suspension is prevented from splashing due to too high rising and too high stirring speed.

Step three, moving the stirring device into a vibrating screen device, and carrying out vibrating screen specifically as follows:

step three (1), releasing the fasteners on the stirring device and the rotary oil pressure rod: because agitating unit and variable stirring rod's outside dead lever fixed connection, in order to rotatory agitating unit to shake sieve device top, need loosen the buckle on agitating unit and the rotatory oil pressure pole.

Step three (2), lifting the stirring device: by raising the lifting rod, the external fixed rod on the variable stirring rod and the stirring device connected to the external fixed rod are simultaneously driven to rise together. The height H 'and the radius R' of the vibrating screen device are respectively larger than the height H and the radius R of the stirring device. Therefore, the rising height of the stirring device is ensured to be larger than the height H' of the vibrating screen device, so that the bottom of the stirring device is not blocked by the vibrating screen device and can smoothly rotate to the area above the vibrating screen device.

Step four, placing screen combination of gravel gradation with different apertures: and connecting the vibrating screen device with a vibrating screen chassis flexible flange. Opening a safety buckle of the vibrating screen device and opening a double-opening door; the screen combination of grading different required apertures of gravel is placed in multistage screen clamping grooves from top to bottom in sequence according to the aperture from big to small, the double-opening covering door is closed, and the buckle on the double-opening covering door is closed. The multistage screen cloth draw-in groove is preferred eight grades, can put into eight different particle sizes's screen cloth, and the at utmost satisfies the gravel of the different apertures that different experiments needed.

Step five, rotating the stirring device to the position above the vibrating screen device: the stirring device is screwed above the vibrating screen device, and the safety buckle on the multi-opening screen door of the stirring device is opened, so that the gravel-doped clay and clear water mixture in the stirring device can fall into the vibrating screen device conveniently.

When the stirring device is opened and the buckles on the more opening screen doors are opened, the stirring device is rotated to the position above the vibrating screen device, the stirring device can be controlled to slightly descend, and one part of the bottom of the stirring device enters the vibrating screen device, so that gravel and clay can smoothly enter the vibrating screen device.

Step six, adding a mixture into a vibrating screen device: controlling a more opening door of the stirring device to open a smaller gap of about L1cm, firstly, dropping suspension, mud-like substances and small-particle gravels in the mixture of gravel-doped clay and clear water into the vibrating screen device, and keeping for 300 s; then continuing to open the gap to about L2cm, where L2> L1, further letting slightly larger gravel particles fall into the vibrating screen apparatus for 250s, and finally opening the gaps to different sizes in sequence, such as L3cm, L4cm, L5cm, and. The multi-opening screen door of the stirring device is opened slowly, so that the mixture of gravel-mixed clay and clean water slowly falls into the vibrating screen device, and suspension and gravel are prevented from splashing.

Step seven, vibrating the sieve to discharge mud and then vibrating the sieve, and specifically comprises the following steps:

(1) opening a vibrating screen chassis for primary vibrating screen: and opening the vibrating screen chassis to vibrate and screen the gravel and the turbid liquid in the vibrating screen device, and further separating the gravel from the clay attached to the gravel. The vibration frequency is gradually increased from low (level 1: 37 times/min; level 2: 74 times/min; level 3: 111 times/min; level 4: 148 times/min), the maximum vibration frequency which can not splash the suspension and the gravel vibrating screen is selected: if the gravel and suspension mixture in the stirring device is completely released into the vibrating screen device and the liquid level does not reach or only reaches 2/3H ', a level 4 frequency vibrating screen can be used, and if the liquid level exceeds 2/3H', a proper vibrating screen frequency needs to be selected according to the situation.

(2) Opening a mud discharge valve on the vibrating screen device, and discharging separated turbid liquid: a container similar to a stainless steel barrel is used for containing the clay suspension.

(3) And opening the vibrating screen device to vibrate the remaining gravels with different particle sizes again, wherein the vibrating screen in the suspension can not ensure that all the gravels in the vibrating screen device fall on the net with the required particle size. Keep row mud valve to open after discharging the clay turbid liquid, start the sieve device that shakes again, shake the sieve to moist gravel, can shake out the remaining turbid liquid on the gravel, discharge to the stainless steel bucket in through row mud valve. And taking out the vibrating screen bottom plate from the vibrating screen device.

Step eight, drying and storing the suspension after standing: the container filled with the clay suspension is left aside for 1 day. The clay can take place the precipitation of certain degree after 1 day of stewing, and one deck clear water layer can appear in the clay turbid liquid top this moment, and the clear water layer on upper strata is dug to the water ladle, can reduce the stoving time on the one hand, and the clear water that on the other hand was dug can supply to stir the separation next time and use when mixing the gravel clay piece. And pouring the left thick clay solution into the drying pan, and ensuring that the height of the thick clay solution in the drying pan is about 3cm, otherwise, the problem of difficulty in drying is caused due to too high height. And (5) placing the baking pans into the baking oven layer by layer for drying. Setting the temperature of the oven to be 105 degrees, and baking for 36 hours to obtain the dry clay without moisture.

The clay board after drying can be knocked through the tup simply, breaks into garrulous clay piece that the diameter is less than 2cm, is convenient for grind through grinding machine, can supply experimental recycling next time.

Step nine, drying and screening gravels with different particle sizes again: the connection between the vibrating screen device and a flexible flange of a vibrating screen chassis is released, a rotary oil pressure rod 3 is controlled to drive a vibrating screen device 6 to rotate 120 degrees to the position above an air blowing device 7, a level 1 weak wind shield of the air blowing device is opened firstly, gravel is pre-dried to a certain degree, excessive moisture on the surface is removed, excessive moisture is prevented from being blown out of an opening above the vibrating screen device by lower warm air, and the temperature of the level 1 weak wind shield can be set to be 105 degrees and maintained for 10 minutes; gradually and sequentially increasing the wind speed gears to level 4, wherein the interval between each gear is 10 minutes, and then maintaining a level 4 strong wind shield until all gravels are dried.

Adopt blast apparatus to dry the gravel in the sieve device that shakes adopts the reinforcing mode step by step, every rank wind speed divides corresponding power respectively to be: 550W, 850W, 1000W and 1200W. The blowing temperature may be set to 0 ° -300 °.

When the screen combination with required gravel gradation with different apertures is selected in the vibrating screen device, when the number of the required screen gradation combination is less than 8, for example, 7 specifications of required apertures of 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm and 19mm, the seven screens with the apertures are sequentially arranged according to the sequence of 1.18mm at the lowest and 19mm at the highest, and are placed in the vibrating screen device, and clay and gravel are sequentially separated according to the Step 4-Step 9; when the required screen mesh grading combination number exceeds 8, for example, the required aperture is 13 specifications of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm and 31.5mm, the eight screen meshes of 2.36mm to 31.5mm are sequentially arranged according to the sequence of 2.36mm at the lowest and 31.5mm at the highest, the eight screen meshes are placed into a vibrating screen device, and clay and gravel soil and stones are sequentially separated according to the vibrating screen step; after separation is finished, opening a safety buckle on the double-opening door for preventing the double-opening door from being opened in the vibrating screen process, controlling the double-opening door to be opened, taking out the screen meshes with the apertures of 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm and 31.5mm and gravels in the screen meshes, and subpackaging the gravels with different particle sizes; after the split charging is completed, taking out the 2.36 mm-diameter screen and gravel in the screen from the lowermost layer in the multistage screen clamping grooves, placing the screen on the uppermost layer in the multistage screen clamping grooves, sequentially arranging 5-diameter screens of 0.075mm, 0.15mm, 0.3mm, 0.6mm and 1.18mm at the lowermost layer and 1.18mm at the uppermost layer, sequentially placing the screens into the clamping grooves below the 2.36 mm-diameter screen in the multistage screen clamping grooves, finally opening the vibration sieve device again by using a control device to perform vibration sieving on the gravel in the 2.36 mm-diameter screen, adjusting the vibration sieve frequency according to the gravel size, and after the vibration sieving is performed for 30 minutes, taking out the screens of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm and 2.36 mm-diameter and gravel in the screen, and split charging the gravel with different particle sizes.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A gravel-doped clay soil-stone separation method based on turbid liquid is characterized by comprising the following steps: the separation steps are as follows:

step one, pouring gravel-doped clay fragments and clean water into a stirring device for mixing;

firstly, crushing gravel-doped clay fragments before mixing the gravel-doped clay fragments with clean water; screening crushed gravel-doped clay fragments by adopting a manual primary screening mode to screen gravel-doped clay fragments with larger volume;

step one (2), the volume of the stirring device is V, the height of the stirring device is H, and the radius of the stirring device is R; adding the primarily screened large and small gravel-doped clay fragments into the stirring device in a stopped state, wherein the filling height of the large and small gravel-doped clay fragments is 1/3H; adding clear water into the stirring device to enable the liquid level to reach 2/3H-3/4H;

step two, starting a telescopic rotating rod in the stirring device to stir so as to drive a hollow stirring paddle to fully stir the gravel-doped clay and the clear water; the stirring process is divided into: initial slow agitation: stirring the large and small gravel-doped clay fragments with clear water to form a suspension initially; and (3) high-speed stirring at the later stage: increasing the rotating speed to stir the preliminarily formed suspension;

step three, moving the stirring device after stirring to the upper part of the vibrating screen device; the height H 'and the radius R' of the vibrating screen device are respectively greater than the height H and the radius R of the stirring device;

placing screens with different apertures in multistage screen clamp grooves in the vibrating screen device, and sequentially placing the screens in the multistage screen clamp grooves from high to low according to the apertures of the screens;

step five, embedding the bottom end of the stirring device into the top end of the vibrating screen device, and releasing turbid liquid into the vibrating screen device from a discharge port at the bottom end of the stirring device; filtering the suspension through a screen arranged from high to low; the outlet form at the bottom of the stirring device adopts a multi-opening door structure;

step six, in the process of releasing the suspension, the stirring device opens an L1cm gap on the bottom multi-open door structure, firstly, the suspension, the mud-like substances and the small-particle gravels in the mixture of the gravel-doped clay and the clear water fall into the vibrating screen device, and the operation is kept for 300 s; then continuing to open the gap to L2cm, wherein L2 is greater than L1, further enabling gravel particles to fall into a vibrating screen device, keeping for 250s, and finally opening to L3cm, L4cm and L5cm in sequence until the gravel particles are completely opened, wherein the gap is gradually increased when the gap is opened for the first time compared with the gap which is opened subsequently, and the keeping time is decreased;

step seven, vibrating the sieve to discharge mud and then vibrating the sieve:

step seven (1), after the step five is completed, opening a vibrating screen device to carry out vibrating screen on the gravel and the suspension to promote the gravel to be separated from clay attached to the gravel; then discharging the separated suspension through a sludge discharge valve in the vibrating screen device; filling clay suspension in a container;

step seven (2) opening a vibrating screen chassis to vibrate the remaining gravels with different grain diameters again, namely keeping a mud discharging valve open after discharging clay suspension, starting the vibrating screen device again, vibrating and screening the gravels on the screen meshes with different pore diameters again, vibrating and discharging the remaining suspension on the gravels to a container through the mud discharging valve;

step eight, standing the suspension in the container for 1 day for precipitation; a clear water layer appears above the precipitated suspension; adopting a water ladle to skim the clear water layer on the upper layer to form thick clay solution; pouring the thick clay solution into a baking pan, and keeping the height of the thick clay solution at 3 cm; baking the clay in an oven with the temperature of 105 ℃ for 36 hours to obtain dry clay without moisture;

step nine, drying and screening gravels with different particle sizes again: transferring the vibrating screen device to the upper part of the blowing device, and removing redundant moisture on gravel in the screen by adopting a weak wind shield; the weak wind gear temperature is 105 degrees: 10 min; and then, sequentially raising the wind speed gears at intervals of 10min until all gravels are dried.

2. The method for separating soil and stone from gravel-doped clay based on suspension liquid of claim 1, wherein: the size of the gravel screen primarily screened in the first step is as follows: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm, 37.5mm, 53.5 mm; and (3) sieving out all gravels with the particle sizes of 53mm, 37.5mm and 31.5mm and part gravels with the particle sizes of 19mm and 16mm from the gravel-doped clay fragments with larger volume by using an artificial primary sieve.

3. The method for separating soil and stone from gravel-doped clay based on suspension liquid of claim 1, wherein: the initial stirring rotating speed of a telescopic rotating rod in the stirring device in the second step is 183 r/min; after the liquid level is stable, the rotating speed is increased to 366 r/min, and the stirring time is 5 min; increasing the rotating speed to 549 r/min again, and stirring for 5 min; finally, the rotating speed is increased to 732 r/min, and the stirring time is 5 min; if tiny bubbles appear on the liquid surface during the final stirring, the stirring time is prolonged.

4. The method for separating soil and stone from gravel-doped clay based on suspension liquid of claim 1, wherein: the telescopic rotary rod in the stirring device adopts the up-and-down motion to stir in the initial stirring stage.

5. The method for separating soil and stone from gravel-doped clay based on suspension liquid of claim 1, wherein: in the sixth step, the vibration frequency of the vibrating screen device is gradually increased from low to high, and the vibration frequency is respectively as follows: level 1: 37 times/min; level 2: 74 times/min; level 3: 111 times/min; level 4: 148 times/min;

if the liquid level of the suspension in the vibrating and screening device does not reach or only reaches 2/3H', the vibration frequency can be increased to level 4.

6. The method for separating soil and stone from gravel-doped clay based on suspension liquid of claim 1, wherein: in the step eight, the blowing gears of the blowing device are level 1, level 2, level 3 and level 4; the wind speed of each gear is respectively corresponding to the power as follows: 550W, 850W, 1000W and 1200W; the blowing temperature can be in the range of 0-300 degrees.

7. The method for separating soil and stone from gravel-doped clay based on suspension as claimed in claim 1, wherein: step three, the screen cloth groove in the vibrating screen device is set to be 8 layers, if the screen cloth in the screen cloth groove is according to the following aperture: when the 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm and 19mm are assembled, the 1.18mm screen is positioned at the lowermost layer to separate clay and gravel;

if the screen mesh in the screen mesh clamping groove has the following apertures: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm when assembling, firstly 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm carry out clay and gravel soil-stone separation according to the assembly from bottom to top, after the clay and gravel soil-stone separation is finished, take out the screen meshes with the aperture of 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm, move the screen mesh with the aperture of 2.36mm to the top layer of the screen mesh of the vibrating screen device, then place the screen meshes with the aperture of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm sequentially from bottom to top again.

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