CN104772284B - A kind of novel except the method for shell - Google Patents
A kind of novel except the method for shell Download PDFInfo
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- CN104772284B CN104772284B CN201410009959.1A CN201410009959A CN104772284B CN 104772284 B CN104772284 B CN 104772284B CN 201410009959 A CN201410009959 A CN 201410009959A CN 104772284 B CN104772284 B CN 104772284B
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Abstract
The present invention provides a kind of novel except the method for shell, the present invention is directed to the characteristic of shell in sea sand, utilizes sand grains and the property difference of shell in sea sand, is separated with sea sand by the shell in sea sand.The method escape of the present invention hedge of conventional process shell, is successfully realized and a large amount of processes the target of shell in sea sand.The advantage of the separation method of the present invention is that operating cost is low, good separating effect, and service life is long.
Description
Technical field
The present invention relates to sea sand process field, be specifically related to a kind of novel except the method for shell.
Background technology
Along with the fast development of China's economy, the expanding day of construction scale, particularly city, southeastern coastal areas process
Quickly propel, cause a lot of coastal cities to face the predicament that river sand resource is exhausted.Minimizing day by day and people along with river sand resource
To fluvial sand exploitation to riverbed, the enhancing of the understanding of ecological disruption, being used for urban architecture after being processed by sea sand has been inevitable
Future architecture sand trend.
Having sea sand very early for building both at home and abroad, current Japanese architecture sand 90% is above treated sea sand.Absolutely
The shell contained in most of sea sand is the harmful components affecting construction material performance, and the intensity of shell is strong far below sand grains
Degree, just can break disconnected easily with hands, and its harm in concrete is equivalent to clod, country's " building sand " standard regulation: " mud
Block is sand Central Plains particle diameter more than 1.18mm, wash through water logging, hands pinch after less than the granule of 600 μm ".
Shell in the sea sand differently dispersed and distributed of size from small to large is in sea sand, after Japan Kobe violent earthquake,
The investigation that situation of damaging the building in earthquake is carried out finds that first the house using sea sand to build collapses.Due to Japan early
Just the chloride ion content to the sea sand for building has done strict restriction, and there is employing in Japan in the building using sea sand
" reinforcing bar rust remover ", to prevent the measure of steel bar corrosion, thus results in the house reason that collapses that sea sand builds and is not due to excess
Chloride ion corrosion reinforcing bar cause the reduction of fabric structure intensity, mixed conchiferous sea sand to bring to building in building
Hidden danger well imagine.
China also has recognized that the shell harm to Building Structure Strength in sea sand, country's building sand specification regulation are not permitted
Permitted containing shell in sand, in order to a large amount of use desalted sea sands solving to have occurred at present are as asking that construction material is brought
Topic, country will have worked out " marine sand concrete application technology specification " in the end of the year 2009, to the content of shell in the sea sand of building
Carry out strict restriction, it is stipulated that the shell full-size in sea sand is not to be exceeded 4.75mm.And shell confent should meet following table
Regulation:
Shell confent in sea sand
| Strength grade of concrete | ≥C40 | C35～C30 | C25～C15 |
| Shell confent (by mass, %) | ≤3 | ≤5 | ≤8 |
The research of the technology of the shell in removing sea sand is imperative.In China coast sea sand processes practice, typically adopt
Removing more than the shell of certain particle diameter with screen cloth, the defect of this way is: screen out more than when setting the shell of particle diameter together with
Time screen out the sea sand more than this particle diameter, and the shell less than this particle diameter cannot be removed, in sea sand the most after treatment still
So containing shell, if directly using architectural together with sea sand, then can reduce intensity and the durability of concrete, be formed potential
Potential safety hazard.
Shell confent exceedes the sea sand of code requirement and cannot function as building sand use, and the shell in sea sand is difficult to effectively
Get rid of, cause sea sand to be difficult to use in high-strength concrete, cause the waste of resource.
At present for how removing less than the shell in the sea sand of mesh size, a lot of research and trial are carried out, as adopted
Process with spiral classifier, but the sea sand after processing still contains substantial amounts of shell, the employing chemical Treatment also having,
This method is the most costly, and can cause environmental pollution, and treatment effect is the most undesirable.
Summary of the invention
It is an object of the invention to overcome drawbacks described above, it is provided that a kind of shell and sea sand of can realizing conscientiously, efficiently
Separate is novel except the method for shell.
Shell is mixed in together with sea sand, belongs to non-homogeneous mixture, both similar density, and the apparent density of shell is somewhat
Big, dispersed and distributed from small to large, use common method to be difficult to both and separate.
In sea sand, shell is mixed in together with sand grains, and in sea sand, sea sand particle diameter is distributed from small to large, the shell in sea sand
Situation is complex, the most not of uniform size, and through long-term seawater movement, shell different, typically with shell skin
Presented in, in irregular lamellar, and sea sand is in block or the solid particle of class round shape.The present invention is multistage by using
The theory of screening, forms sea sand and the shell mixture of multiple certain particle size interval, then utilizes the character that the two is different by it
Separate.
The definition of particle size interval described herein refers to sea sand sand grains and the sea sand sand grains in the mixture of shell
Particle size interval.
First, the present invention realizes the technical scheme of above-mentioned design and is:
A kind of novel except the method for shell, it is characterised in that to comprise the following steps:
(1) screening: sieved by the screen cloth of conchiferous sea sand different pore size, obtains the sea sand sand that different-grain diameter is interval
Grain and the mixture of shell；The ratio in the aperture of described pore size adjacent screen mesh is not more than 20；
(2) separate: the sea sand sand grains in the different-grain diameter interval that step (1) is obtained and shell mixture difference or part point
Again do not sieve so that it is crossing the sieve that sieve aperture is long and narrow, the shell in mixture falls from sieve aperture, and sea sand sand grains is cut by screen cloth
Obtain, it is achieved sea sand sand grains and the separation of shell；Horizontal the widest part of described long and narrow sieve aperture is not more than and described is again sieved
Sea sand sand grains and the higher limit of the particle size interval of sand grains in the mixture of shell, the longitudinal length of described long and narrow sieve aperture is more than described
The lower limit of the particle size interval of the mixture of the sea sand sand grains again sieved and shell.
Further, the technical scheme is that
Horizontal the widest part of the described long and narrow sieve aperture of described step (2) be not more than the described sea sand sand grains again sieved with
The lower limit of the particle size interval of sand grains in the mixture of shell.
Yet further, in described step (2), the longitudinal length of described long and narrow sieve aperture is more than the described sea again sieved
The higher limit of the particle size interval of the mixture of sand sand grains and shell.
Further, after the screening of described step (1), before the separation of described step (2), further comprising the steps of:
(1 ') crushes: the sea sand sand grains in different-grain diameter interval step (1) obtained and the mixture difference of shell or portion
Dividing and crush respectively, intensity is fractured into less fragment less than the shell of sea sand sand grains.
Further, between described step (1 ') separates with described step (2), further comprising the steps of:
(1 ") regrading: the mixing of the interval sea sand sand grains of each different-grain diameter obtained for step (1 ') and shell
Thing, respectively regrading, the aperture of the screen cloth used by regrading is not more than by the mixture of the sea sand of regrading with shell
The higher limit of particle size interval.
Preferably, the described long and narrow sieve aperture in described separating step is ellipse, rectangle, parallelogram, trapezoidal
Or other any elongated shape.
More preferably, the sieve aperture of the screen cloth that described step (1) is sieved is circular or square or triangle.
It is highly preferred that the sieve during described step (2) separates is grid, the interval between adjacent grill is not more than described quilt
The sea sand sand grains again sieved and the higher limit of the particle size interval of sand grains in the mixture of shell.
The method that present invention also offers the another kind of shell removed in sea sand, its technical scheme is:
A kind of novel except the method for shell, it is characterised in that to comprise the following steps:
(1) screening: sieved by the screen cloth of conchiferous sea sand different pore size, obtains the sea sand sand grains that different-grain diameter is interval
Mixture with shell；The ratio in the aperture of described pore size adjacent screen mesh is not more than 20；
(2) broken: the sea sand sand grains in the different-grain diameter interval that step (1) is obtained and the mixture difference of shell or part
Crushing respectively, intensity is fractured into less fragment less than the shell of sand grains.
(3) separate: the sea sand sand grains in the different-grain diameter interval that step (2) is obtained and the mixture of shell, difference or portion
Dividing and the most again sieve, the aperture of the screen cloth used that again sieves no more than is sized the higher limit of the particle size interval of mixture；
Shell in mixture falls from sieve aperture, and the sand grains of the sea sand in mixture is intercepted and captured by screen cloth, it is achieved sea sand sand grains and shell
Separate.
Further, this method technical scheme it may also is that
The aperture of the screen cloth used that again sieves in described step (3) separation is not more than in the mixture again sieved
The lower limit of the particle size interval of sand grains.
Yet further, the aperture of the described screen cloth in described step (1) screening is in the range of 75 μm～10mm.
Further, the sieve aperture of the screen cloth that described step (1) is sieved is circular or square or triangle.
Present invention also offers another method removing the shell in sea sand, its technical scheme is:
A kind of novel except the method for shell, it is characterised in that to comprise the following steps:
(1) screening: conchiferous sea sand sieve aperture is long and narrow and the different screen cloth of transverse width sieves, described laterally
The ratio of the transverse width of the sieve aperture of the sieve that width size is adjacent is not more than 20, obtains the interval sea sand sand grains of different-grain diameter and shell
Mixture；
(2) separate: the sea sand sand grains in the different-grain diameter interval that step (1) obtains and the mixture difference of shell or part point
Again not sieving, the widest part of the sieve aperture of described sieve is more than this by the lower limit of the particle size interval of the mixture of the middle sand grains that again sieves
Being worth, the shell in mixture is intercepted and captured by screen cloth, and the sea sand sand grains in mixture falls from sieve aperture, obtains the sea that different-grain diameter is interval
Sand sand grains, it is achieved sea sand sand grains separates with shell.
Further, this method technical scheme it may also is that
The different screen cloth of transverse width in described step (1) screening is the grid that between grizzly bar, gap is different, described
The ratio in the gap of the grid that gap length between grizzly bar is adjacent is not more than 20.
Yet further, the sieve aperture of the sieve during described step (2) separates is circular or square or triangle.
Present invention also offers another method removing the shell in sea sand, its technical scheme is:
A kind of novel except the method for shell, it is characterised in that to comprise the following steps:
(1) screening: conchiferous sea sand sieve aperture is long and narrow and the different screen cloth of transverse width sieves, described laterally
The ratio of the transverse width of the sieve aperture of the sieve that width size is adjacent is not more than 20, obtains the interval sea sand sand grains of different-grain diameter and shell
Mixture；
(2) broken: the sea sand sand grains in the different-grain diameter interval that step (1) is obtained and the mixture difference of shell or part
Crushing respectively, the shell making intensity be less than sand grains is fractured into less fragment；
(3) separate: step (2) is obtained broken after the mixture of the interval sea sand sand grains of different-grain diameter and shell divide
Or partly the most again not sieving, the shell in mixture falls from sieve aperture, and the sand grains of sea sand is intercepted and captured by screen cloth, it is achieved sea sand sand
Grain and the separation of shell；The aperture of the described sieve aperture again sieved is not more than the described sea sand sand grains again sieved and shell
Mixture in the higher limit of particle size interval of sand grains.
Further, this method technical scheme it may also is that
Screen cloth in described step (1) screening is the grid that between grizzly bar, gap is different, the gap between described grizzly bar
The ratio in the gap of the grid that size is adjacent is not more than 20.
Preferably, the sieve during described step (3) separates be sieve aperture be long and narrow and the different screen cloth of transverse width, screen cloth
Transverse width is not more than the described sea sand sand grains again sieved and the higher limit of the particle size interval of sand grains in the mixture of shell
1.5 times.
More preferably, the sieve during described step (3) separates is grid, and the interval between adjacent grill is not more than described quilt
In the mixture of the sea sand sand grains again sieved and shell 1.5 times of the higher limit of the particle size interval of sand grains.
The present invention has reoffered a kind of method of shell removed in sea sand, and its technical scheme is:
A kind of novel except the method for shell, it is characterised in that to comprise the following steps:
(1) screening: sieved by the screen cloth of conchiferous sea sand different pore size, obtains the sea sand sand grains that different-grain diameter is interval
Mixture with shell；The ratio in pore size adjacent screen mesh aperture is not more than 20；
(2) broken: the sea sand sand grains in the different-grain diameter interval that step (1) is obtained and shell mixture difference or part point
Not crushing, intensity is fractured into less fragment less than the shell of sand grains.
(3) waterpower separates: with the medium stream risen, respectively or part washes away the different-grain diameter interval that step (2) obtains respectively
The mixture of sea sand and shell, the sedimentation velocity in mixture is less than rising the shell of flow velocity of medium stream along with current direction
On, the sedimentation velocity in mixture settles downwards more than the sea sand sand grains of the flow velocity rising medium stream, thus realizes sea sand and shellfish
The separation of shell；The speed of described medium stream should be not more than the termin al velocity of the sand grains of washed away particle size interval, and is more than
Be broken the terminal velocity of shell.
Further, this method technical scheme it may also is that
In described step (1) screening with the screen cloth of different pore size be sieve aperture be long and narrow and the different screen cloth of transverse width.
Yet further, this method technical scheme it may also is that
Described step (1) screening is the grid that between grizzly bar, gap is different with the screen cloth of different pore size., gap length phase
The ratio in the gap of adjacent grid is not more than 20.
The present invention has reoffered a kind of method of shell removed in sea sand, it is characterised in that comprise the following steps:
(1) hydraulic classiciation: the medium stream being respectively adopted the different rising of speed washes away conchiferous sea sand from bottom to top, mixed
Termin al velocity in compound settles downwards with shell more than the sand grains of the medium stream flow velocity risen, free settling in mixture
End speed is less than the sand grains of the water velocity risen with shell along with, on current direction, obtaining the interval sea sand sand grains of different-grain diameter and shellfish
The mixture of shell；
(2) broken: the sea sand in different-grain diameter interval step (1) obtained and the mixture difference of shell or part are respectively
Crushing, intensity is fractured into less fragment less than the shell of sand grains；
(3) separate: the mixture difference of the sea sand of each particle size interval step (2) obtained and shell or part are respectively
Sieving, the aperture of screen cloth used is less than and is sized the higher limit of the particle size interval of sand grains in mixture, being broken in mixture
Broken shell falls from sieve aperture, and sand grains is intercepted and captured by screen cloth, thus realizes the separation of sea sand sand grains and shell.
Further, this method technical scheme it may also is that
Described step (3) sieve middle screen cloth be sieve aperture be long and narrow and the different screen cloth of transverse width
Yet further, this method technical scheme it may also is that
Screen cloth in described step (3) screening is the different grid in the gap between grizzly bar, between described grizzly bar between
Gap is less than being sized 1.5 times of the higher limit of the particle size interval of sand grains in mixture.
The present invention has reoffered a kind of method of shell removed in sea sand, it is characterised in that comprise the following steps:
(1) hydraulic classiciation: the medium stream being respectively adopted the different rising of speed washes away conchiferous sea sand from bottom to top, mixed
Termin al velocity in compound settles downwards with shell more than the sand grains of the medium stream flow velocity risen, free settling in mixture
End speed less than sand grains and the shell of the medium stream flow velocity risen along with on current direction, obtain the interval sea sand sand grains of different-grain diameter with
The mixture of shell；
(2) broken: the sea sand in different-grain diameter interval step (1) obtained and the mixture difference of shell or part are respectively
Crushing, intensity is fractured into less fragment less than the shell of sand grains；
(3) separate: respectively or the most again wash away, with medium stream, the process obtained by step (2) from bottom to top broken
The mixture of the interval sea sand sand grains of different-grain diameter and shell, the termin al velocity in mixture is less than the medium stream risen
The shell of flow velocity is along with, on current direction, in mixture, termin al velocity is more than the sand grains of the medium stream flow velocity risen to sinking
Fall, thus realize the separation of sea sand sand grains and shell, obtain the sea sand sand grains that different-grain diameter is interval respectively；The speed of described medium stream
Degree should be greater than being broken the terminal velocity of shell, and is not more than the termin al velocity of the sand grains of the particle size interval washed away.
The advantage of the method for the shell in the above-mentioned removing sea sand of the present invention is: utilize the physical characteristic of shell and sand grains
And the intensity of shell is less than the feature of the intensity of sand grains, use mechanical grading, hydraulic classiciation, the broken processing method combined,
Technique is simple, and various informative, expense is low, free from environmental pollution, good separating effect.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
In this example, different from the physical characteristic of sand grains for shell in sea sand, both are separated.Shell is mingled in sea sand
Together, belong to non-homogeneous mixture, both similar density, use common method to be difficult to both and separate.In sea sand, shell
Mixed in together with sand grains, in sea sand, sea sand particle diameter is distributed from small to large, and the shell situation in sea sand is complex, the table of shell
Sight density is slightly larger, from small to large dispersed and distributed, the most not of uniform size, and through long-term seawater movement, the shape of shell
Shape is different, and typically presented in shell skin, in irregular lamellar, and sea sand is in block or the solid of class round shape
Grain.The method of the shell removed in sea sand in this example, detailed description of the invention is as follows:
First sieve with the screen cloth that mesh size is 10mm, screen out particle diameter more than the big particle diameter sand grains of 10mm, stone and big
Shell, then the mixture of the sea sand sand grains obtained and shell is sieved successively according to mesh size order from big to small,
The sea sand sand grains of grain size intervals and the mixture of shell is determined to difference；The aperture of screen cloth used in the range of no more than 10mm by
Step reduces.For reaching effectively to remove shell, it is ensured that elimination effect, prevent shell from omitting in sea sand, for adjacent twice screening
The ratio in screen sizes aperture used should be not more than 10, to ensure the effect of screening.In this example, screening 5 times altogether, mesh size is successively
For: 4.75mm, 2.5mm, 1.0mm, 0.28mm and 75 μm, it is thus achieved that particle size interval is respectively 2.5～4.75mm, 1～2.5mm,
0.28～1.0mm, the sea sand sand grains of 75 μm～0.28mm and 0～75 μm and the mixture of shell.Because the sea of 0～75 μ m
Sand sand grains, less than the lower limit of the natural sand of regulation in country's building sand standard, therefore cannot function as construction material, it is not necessary to consider
Process to it.Examples below repeats no more.
Carry out separating treatment again, will enter respectively with shell mixture by the interval sea sand sand grains of different-grain diameter obtained above
Row sieves again, it is achieved separate.This separate used by the sieve aperture of screen cloth be elongated shape, the sieve aperture of this long and narrow horizontal
The widest part is not more than the higher limit of the described sea sand sand grains again sieved and the particle size interval of the mixture of shell, the most not quite
Lower limit in the described sea sand sand grains again sieved Yu the particle size interval of the mixture of shell.The longitudinal direction of described long and narrow sieve aperture
Length is preferably greater than the higher limit of the described sea sand sand grains again sieved and the particle size interval of the mixture of shell, so that mixed
Shell in compound falls from sieve aperture, and sea sand sand grains is intercepted and captured by screen cloth, it is achieved sea sand sand grains and the separation of shell.By each separation
The interval sea sand sand grains of the different-grain diameter that obtained mixes, and i.e. can obtain the mixing of sea sand sand grains containing different-grain diameter
Thing, carries out desalination process to this mixture, i.e. can obtain can be used for the building sand of building field.
Using sieve aperture in the separating step of this example respectively is that rectangular screen cloth separates, the mixing of each particle size interval
Thing is divided into two groups, the screen size such as following table of concrete screen cloth used:
By the sieving separating again of the mixture interval to different-grain diameter, make the shellfish in the mixture of every kind of particle size interval
Shell falls from sieve aperture, and the sea sand sand grains in mixture is then intercepted and captured by screen cloth, it is achieved sea sand sand grains and the separation of shell.
In first group of separation example of this example, horizontal the widest part of the sieve aperture of separating step is no more than the sea again sieved
The lower limit of the particle size interval of the mixture of sand sand grains and shell.
The second component of this example is in example, and the longitudinal length of the sieve aperture of separating step is all higher than the sea sand sand again sieved
The higher limit of grain and the particle size interval of the mixture of shell.
In this example, the aperture of the screen cloth of screening step changes in the range of 75 μm～4.75mm step by step, and in screening step
The ratio of adjacent size mesh size be not more than 4.
The sieve aperture shape of screen cloth used in the separating step of the method for the present invention is not limited to rectangle, it is also possible to be
Trapezoidal, parallelogram, irregular tetragon, pentagon, hexagon even other polygons, if its meet sieve aperture
Horizontal the widest part is not more than the higher limit of the particle size interval of the mixture of sea sand sand grains and the shell again sieved, preferably
It is not more than the lower limit of the described sea sand sand grains again sieved and the particle size interval of the mixture of shell.
The shape of the sieve aperture of screen cloth used in the separating step of the method for the present invention can also is that ellipse, its short axle
Length should be not more than the higher limit of the particle size interval of sea sand and the shell mixture again sieved, and is preferably no greater than by again
The lower limit of the particle size interval of the mixture of the secondary sea sand sand grains sieved and shell；The length of its major axis is more than again being sieved
Sea sand and the lower limit of the particle size interval of shell mixture, be preferably greater than the sea sand and shell mixture again sieved
The higher limit of particle size interval.
Utilize above-mentioned screen cloth, the granular sand grains of the lower limit that diameter is more than particle size interval can be made to be blocked by screen cloth
Cut, be retained on screen cloth, and the shell of lamellar is constantly changing position in the vibration of screen cloth, then more than particle diameter from sieve aperture
Sliding and fall in the gap of interval lower limit, thus is separated from mixture.
Sieve used in the separating step of the method for the present invention can also is that grid, and the interval between adjacent grill should be little
Lower limit in the sea sand sand grains again sieved Yu the particle size interval of the mixture of shell.
Utilize such grid, the granular sand grains of the lower limit that diameter is more than particle size interval can be made to be blocked by screen cloth
Cut, be retained on screen cloth, and the shell of lamellar is constantly changing position in the vibration of grid, then from the adjacent grill of grid
Between gap slide and fall, thus separated from mixture.
After the screening step of the method for the present invention, before separating step, it is also possible to increase following steps:
(1 ') crushes: the sea sand sand grains in different-grain diameter interval screening step obtained is carried out respectively with the mixture of shell
Broken, the shell making intensity be less than sea sand sand grains is fractured into less fragment.The intensity utilizing shell is much smaller than the strong of sand grains
The feature of degree, the sea sand sand grains in different-grain diameter interval screening step obtained crushes respectively with the mixture of shell, makes
Intensity is fractured into less fragment less than the shell of sand grains, and sand grains hardness is higher, the most broken and broken seldom, then carry out
Separate, advantage of this is that the separating effect that can better ensure that shell, and owing to the size of shell is the most reduced, make
Obtain shell and be easier to landing from sieve aperture, improve the efficiency separated, reduce disengaging time.
Further, it is also possible between destruction step and separating step, following steps are increased:
(1 ") regrading: the mixing of the interval sea sand sand grains of each different-grain diameter obtained for step (1 ') and shell
Thing, respectively regrading, the purpose of regrading is to ensure that sand grains is not screened out, and only makes the undersized shell after crushing from sieve
Hole falls.Therefore, the size of the sieve aperture of the screen cloth used by regrading should be no more than sea sand and the shell being sized
The lower limit of particle size interval of mixture, thereby may be ensured that more preferable separating effect.
The sand grains mixing that will obtain on all previous screen cloth, can obtain the sand grains interval containing different-grain diameter eliminating shell
Sea sand.
This method, by using the theory of multi-stage screening, is initially formed multiple sea sand with certain particle size interval and shell
Mixture, then utilizes the difference of the two physical property to be isolated.
When being embodied as the method for the present invention, can according to being actually subjected to the particle diameter situation of sea sand and shell mixture that separates,
Suitably adjust the shape of sieve aperture of screen cloth used when the number of times of screening, the size of sieve aperture and/or separating step, size, with
Guarantee to clear out the shell of mixing.
The advantage of the method for the shell in the above-mentioned removing sea sand of the present invention is: the method using mechanical grading, technique
Simply, expense is low, good separating effect.
Embodiment 2
This example essentially consists in the difference of embodiment 1: use screening realize with the broken method combined sea sand sand grains and
The separation of shell.Detailed description of the invention is as follows:
First sieve with the screen cloth that mesh size is 10mm, screen out particle diameter more than the big particle diameter sand grains of 10mm, stone and big
Shell, then the mixture of the sea sand sand grains obtained and shell is sieved successively according to mesh size order from small to large,
The sea sand sand grains of particle size interval and the mixture of shell is determined to difference；The aperture of screen cloth used is in the range of no more than 10mm
Incrementally increase.For reaching effectively to remove shell, it is ensured that elimination effect, prevent shell from omitting in sea sand, for adjacent twice sieve
Used by point, the ratio in screen sizes aperture should be not more than 10, to ensure the effect of screening.In this example, screening 5 times altogether, mesh size depends on
Secondary it is: 75 μm, 0.28mm, 1.0mm, 2.5mm and 4.75mm, it is thus achieved that particle size interval is respectively 0～75 μm, 75 μm～0.28mm,
0.28～1.0mm, the sea sand sand grains of 1～2.5mm and 2.5～4.75mm and the mixture of shell.
Then crush, the sea sand sand grains in the different-grain diameter interval that above-mentioned screening step is obtained and the mixture of shell
Crushing respectively, intensity is fractured into less fragment less than the shell of sand grains.
Separate again: the sea sand sand grains interval for each different-grain diameter obtained after crushing and the mixture of shell,
The most again sieving, the aperture of the screen cloth used that again sieves no more than is sized the higher limit of the particle size interval of mixture；Mixed
Shell in compound falls from sieve aperture, and the sand grains of the sea sand in mixture is intercepted and captured by screen cloth, it is achieved containing shell sea sand sand grains and shellfish
The separation of shell.
The aperture of above-mentioned screen cloth when again sieving preferably no greater than is sized the lower limit of the particle size interval of mixture, from
And can thoroughly filter the shell in mixture, reach outstanding separating effect.
In this example, the aperture of the screen cloth of screening step changes in the range of 75 μm～4.75mm step by step, and in screening step
The ratio of adjacent size mesh size be not more than 4.
In this example, the sieve aperture of the screen cloth of screening step is circular, it is also possible to be square or triangle.
Embodiment 3
This example is different from the physical characteristic of sand grains for shell in sea sand similarly to Example 1, both is separated.This example
Detailed description of the invention as follows:
First conchiferous sea sand is crossed successively according to mesh size order from big to small the sieve that sieve aperture is long and narrow, sieve
The transverse width in hole progressively reduces in the range of no more than 10mm.For reaching effectively to remove shell, it is ensured that elimination effect, prevent
Shell is omitted in sea sand, and the ratio of the transverse width of the sieve aperture of the sieve of adjacent two-stage is not more than 10, to ensure the effect of screening,
The sea sand sand grains interval to different-grain diameter and the mixture of shell.
In this example, in screening step, sieve used is grid, altogether screening 5 times, between the adjacent grill of adjacent two-stage grid
Interval be followed successively by: 4.75mm, 2.4mm, 1.1mm, 0.29mm and 75 μm, it is thus achieved that particle size interval is respectively 2.4～4.75mm,
1.1～2.4mm, 0.29～1.1mm, the sea sand sand grains of 75 μm～0.29mm and 0～75 μm and the mixture of shell.
The mixture of the interval sea sand sand grains of the different-grain diameter that above-mentioned screening step obtained again and shell is carried out point respectively
From process, again sieve, owing in mixture, the radical length of shell is greater than the particle diameter of sea sand sand grains, the most again
The widest part of secondary sieve aperture when sieving should be sieved the higher limit of the particle size interval of mixture equal to or more than this, and being preferably slightly larger than should
By the higher limit of particle size interval of sieve mixture, then the shell in mixture is intercepted and captured by screen cloth, the sea sand sand grains in mixture from
Sieve aperture falls, and obtains the sea sand sand grains that different-grain diameter is interval, it is achieved sea sand sand grains separates with shell.
The screen cloth using aperture size such as following table in the separating step of this example respectively carries out separating treatment:
In this example, the sieve aperture of the sieve in separating step is circular, and sieve aperture can also be square or triangle.
Embodiment 4
This example is different from the physical characteristic of sand grains for shell in sea sand similarly to Example 3, both is separated.This example
Detailed description of the invention as follows:
First conchiferous sea sand is crossed successively according to mesh size order from small to large the sieve that sieve aperture is long and narrow, sieve
The transverse width in hole incrementally increases in the range of no more than 10mm.For reaching effectively to remove shell, it is ensured that elimination effect, prevent
Shell is omitted in sea sand, and the ratio of the transverse width of the size sieve aperture of the sieve of adjacent two-stage is not more than 10, to ensure the effect of screening
Really, the mixture of the interval sea sand sand grains of different-grain diameter and shell is obtained.In this example, screening 5 times altogether, the sieve aperture shape that screening uses
Shape is oval, and the length of its short axle i.e. transverse width of sieve aperture is followed successively by: 75 μm, 0.28mm, 1.0mm, 2.5mm and
4.75mm, to the longitudinal length of long and narrow sieve aperture without limiting in this method more, the long axis length of oval sieve aperture in this example
I.e. longitudinal length is respectively as follows: 0.3mm, 1.4mm, 5mm, 10mm and 20mm, it is thus achieved that particle size interval is respectively 0～75 μm, 75 μm～
0.28mm, 0.28～1.0mm, the sea sand sand grains of 1～2.5mm and 2.5～4.75mm and the mixture of shell.
The sea sand sand grains in different-grain diameter interval above-mentioned screening step obtained again breaks respectively with the mixture of shell
Broken, the shell making intensity be less than sand grains is fractured into less fragment.
Then separating step is carried out: for the sea sand sand grains in each different-grain diameter interval obtained after crushing and mixing of shell
Compound, crosses the sieve that sieve aperture is long and narrow the most again, and horizontal the widest part of the long and narrow sieve aperture of this screening should be not more than quilt
The lower limit of the particle size interval of the mixture of the sea sand sand grains again sieved and shell；Due to after destruction step, shell
Size has significant change, and the particle size range of sand grains there is no how many change, and the shell in mixture falls from sieve aperture, the sand of sea sand
Grain is intercepted and captured by screen cloth, thus realizes the separation of sea sand sand grains and shell.
The screen cloth using aperture size such as following table in the separating step of this example respectively carries out separating treatment:
In this example, carry out using during separating step the sieve of oval sieve aperture, the i.e. sieve aperture of the length of its short axle horizontal
Width is not more than the lower limit of the particle size interval of the mixture of sea sand sand grains and the shell again sieved, and the length of its major axis is i.e.
The longitudinal length of sieve aperture is more than the higher limit by the sea sand sand grains of sieving separating again with the particle size interval of the mixture of shell.This
The sieve aperture shape of the sieve used by the separating step of method is not limited to ellipse, the shape of sieve aperture can also be other shapes such as
Rectangle, trapezoidal, parallelogram, irregular tetragon, pentagon, hexagon even other polygons, as long as it meets
Sieve aperture horizontal the widest part be not more than under the particle size interval of the mixture by sea sand sand grains and the shell of sieving separating again
Limit value.When this method carries out again sieving separating, to the longitudinal length of long and narrow sieve aperture without limiting more.
Utilize above-mentioned screen cloth, the granular sand grains of the lower limit that diameter is more than particle size interval can be made to be blocked by screen cloth
Cut, be retained on screen cloth, and the shell of lamellar is constantly changing position in the vibration of screen cloth, then slide from sieve aperture
Under, thus separated from mixture.
Sieve used in the separating step of the method for the present invention can also is that grid, and the interval between adjacent grill should not
More than the lower limit by the sea sand sand grains of sieving separating again with the particle size interval of the mixture of shell.
Utilize such grid, the granular sand grains of the lower limit that diameter is more than particle size interval can be made to be blocked by screen cloth
Cut, be retained on screen cloth, and the shell of lamellar is constantly changing position in the vibration of grid, then from the adjacent grill of grid
Between gap slide and fall, thus separated from mixture.
Embodiment 5
Shell is mixed in together with sea sand, belongs to non-homogeneous mixture, both similar density, uses common method to be difficult to
Both are separated.In sea sand, shell is mixed in together with sand grains, and in sea sand, sea sand particle diameter is distributed from small to large, in sea sand
Shell situation is complex, and the apparent density of shell is slightly larger, from small to large dispersed and distributed, the most not of uniform size, and warp
Cross long-term seawater movement, shell different, typically presented in shell skin, in irregular lamellar, and sea sand
For in block or the solid particle of class round shape.The intensity of shell is much smaller than the intensity of sand grains, and at same size and the granule of density
In, with the terminal velocity of spheroidal particle as maximum, the terminal velocity of other irregularly shaped particles is then the least.This is because
The reason that the resistance coefficient of irregularly shaped particles is bigger than spherical grain resistance coefficient.The shell of lamellar is more block and the sand of class round shape
Resistance coefficient suffered by Li is big, has different ultimate falling velocity in the Newtonian fluid field of force.Therefore for sea sand in this example
Middle shell is different from the above-mentioned physical characteristic of sand grains, it is provided that another removes the method for the shell in sea sand, i.e. uses many
Level screening, forms the interval sea sand of multiple certain particle size and shell mixture, and the two shape of recycling is different and the sedimentation that formed
The two is separated by the method for the difference hydraulic classiciation of speed.Detailed description of the invention is as follows:
First, first sieve with the screen cloth that mesh size is 10mm, screen out particle diameter more than the big particle diameter sand grains of 10mm, stone
And big shell, then by the mixture of the sea sand sand grains that obtains and shell according to mesh size order mistake successively from small to large
Sieve, obtains difference and determines the sea sand sand grains of particle size interval and the mixture of shell；The aperture of screen cloth used is at the model of no more than 10mm
Incrementally increase in enclosing.For reaching effectively to remove shell, it is ensured that elimination effect, prevent shell from omitting in sea sand, for adjacent two
The ratio in screen sizes aperture used by secondary screening should be not more than 20, preferably no greater than 4, to ensure the effect of good screening.This example
In, use round-hole mesh to sieve altogether 5 times, screen-aperture is followed successively by: 75 μm, 0.28mm, 1.0mm, 2.5mm and 4.75mm, it is thus achieved that grain
Interval, footpath is respectively 0～75 μm, 75 μm～0.28mm, and 0.28～1.0mm, the sea sand sand grains of 1～2.5mm and 2.5～4.75mm
Mixture with shell.
Then destruction step is carried out: the mixture of the interval sea sand of the different-grain diameter that the most above-mentioned screening step obtains and shell
Crushing respectively, utilize the intensity feature much smaller than the intensity of sand grains of shell, the shell making intensity be less than sand grains is broken
The fragment of Cheng Geng little, and sand grains is broken few, can better ensure that the separating effect of the shell of follow-up separating step.
Then waterpower separation is carried out: wash away, with the medium stream risen, the different-grain diameter interval that above-mentioned screening step obtains respectively
The mixture of sea sand and shell, the termin al velocity in mixture is less than rising the shell of flow velocity of medium stream along with current
Upwards, the termin al velocity in mixture settles downwards more than the sea sand sand grains of the flow velocity rising medium stream, thus realizes sea
Sand separates with shell；The speed of medium stream should be greater than the termin al velocity of shell, and is not more than the particle size interval washed away
The termin al velocity of sand grains.
In this example, for 75 μm～0.28mm, 0.28～1.0mm, 1～2.5mm and 2.5～these four particle diameter districts of 4.75mm
Between the mixture of sea sand sand grains and shell, calculate termin al velocity and the terminal velocity of shell of sea sand sand grains one by one, and
The flow velocity making medium stream is slightly less than the termin al velocity of the sea sand sand grains of this particle size interval to be separated, and more than this particle diameter district
Between the terminal velocity of shell, in this example, calculate 4 termin al velocities obtained and be more than 0.001m/s, and be less than
20m/s, it is contemplated that the factor impacts such as production efficiency, structure and particle diameter, the flow velocity every time realizing separating used medium stream divides successively
Not Wei 1m/s, 1.5m/s, 2.74m/s, 5.88m/s.
The termin al velocity υ of sedimented particle0Calculate with this formula of following Storrs gram:
The heavy speed (cel) of υ granule.
G acceleration of gravity.
R is the radius (centimetre) of granule.
d1The proportion of granule.
d2For aqueous medium proportion.
μ aqueous medium viscosity.
κ is form factor, changes with shape, to spheroidal particle κ=0.222, flake shaped particle κ=0.040.
Medium stream in this example is current, and the medium stream in the inventive method can also be sea water stream.
Preferably, in the inventive method, it is also possible to after screening step, before separating step, destruction step is increased: will
The sea sand sand grains in the different-grain diameter interval that screening step obtains crushes respectively with shell mixture, and intensity is less than the shellfish of sand grains
Shell is fractured into less fragment, and sand grains is broken few, can better ensure that the separation of the shell of follow-up separating step
Effect.
When being embodied as the method for the present invention, can according to the particle diameter situation of reality sea sand to be separated with shell mixture,
Suitably adjust the number of times of screening, the shape of sieve aperture, size, adjust the speed of current when waterpower separates, to guarantee mixing
Shell clears out.
Embodiment 6
This example detailed description of the invention is as follows:
The medium stream being respectively adopted the different rising of speed washes away conchiferous sea sand from bottom to top, the freedom in mixture
Terminal velocity continues sedimentation downwards more than the sand grains of the medium stream flow velocity risen with shell, and in mixture, termin al velocity is less than
The sand grains of the water velocity risen and shell are along with on current direction.In this example, the speed of medium stream is at 0.001m/s～20m/s model
Increase step by step in enclosing, every grade wash away after because of sedimentation obtain mixture washed away by next stage medium stream again, every grade wash away after mix
Obtain with the rising of medium stream in thing is sand grains and the mixture of shell in different-grain diameter interval；In this example, calculate acquisition
The termin al velocity of sea sand sand grains is all higher than 0.001m/s, less than 20m/s, it is contemplated that production efficiency, structure and particle diameter etc. because of
Element impact, the flow velocity rising medium stream respectively is 0.05m/s, 1m/s, 1.5m/s, 2.74m/s, 5.88m/s, it is thus achieved that particle diameter
Interval is respectively as follows: 0～75 μm, 75 μm～0.28mm, 0.28～1.0mm, the sea sand sand grains of 1～2.5mm and 2.5～4.75mm with
The mixture of shell.
The inventive method can also be that the speed making medium stream reduces in the range of 0.001m/s-20m/s step by step, every grade of punching
The mixture obtained because rising with medium stream after brush is washed away by next stage medium stream again, and every grade is washed away in rear mixture because of sedimentation
And obtain is the interval sand grains of different-grain diameter and the mixture of shell；
Then destruction step is carried out: the sea sand in the different-grain diameter interval that the most above-mentioned hydraulic classiciation step obtains is mixed with shell
Compound crushes respectively, utilizes the intensity of shell much smaller than the feature of the intensity of sand grains, makes intensity be less than the shell quilt of sand grains
It is broken into less fragment, and sand grains is broken few, can better ensure that the separating effect of the shell of follow-up separating step.
Then sieving separating is carried out: the sea sand sand grains of each particle size interval above-mentioned steps obtained and the mixture of shell
Sieving respectively, the aperture of screen cloth used should equal or slightly larger than be sized the higher limit of the particle size interval of mixture, mixture
In sand grains fall from sieve aperture, shell is intercepted and captured by screen cloth, thus realizes the separation of sea sand sand grains and shell.
In this example, the sieve aperture of screening sieve used be circular, and sieve diameter is respectively as follows: 75 μm, 0.3mm, 1.0mm, 2.6mm with
5mm。
Sieve aperture in the inventive method can also be other shapes such as: square, triangle.
When being embodied as the method for the present invention, can according to the particle diameter situation of reality sea sand to be separated with shell mixture,
Suitably adjust the number of times of screening, the shape of sieve aperture, size, adjust the speed of current when waterpower separates, to guarantee mixing
Shell clears out.
The inventive method uses the method that mechanical grading and hydraulic classiciation combine, in separating step, for shell with
The difference of sand particle size, utilizes the difformity object of similar density in Newtonian fluid place by the difference of additional drag, makes two
Person realizes relative motion in the artificial fluid field manufactured, thus both is separated.This example has been expanded heterogeneous system and has been separated suitable
By the scope of physical property difference, Newtonian fluid field is introduced in the separation of sea sand, be equally applicable to other similar heterogeneous
System separates, and technique is simple, and expense is low, free from environmental pollution, good separating effect.
Embodiment 7
This example is different from the physical characteristic of sand grains for shell in sea sand similarly to Example 6, both is separated.This example
Detailed description of the invention as follows:
First hydraulic classiciation is carried out: the medium stream being respectively adopted the different rising of speed washes away conchiferous sea from bottom to top
Sand, the termin al velocity in mixture continues sedimentation, mixture downwards more than the sand grains of the medium stream flow velocity risen with shell
Middle termin al velocity is less than the sand grains of the water velocity risen with shell along with on current direction.In this example, the speed of medium stream
Increase step by step in the range of 0.001m/s～20m/s, every grade wash away after because of sedimentation obtain mixture again by next stage medium stream
Washing away, every grade is washed away and rises with medium stream in rear mixture and obtain is the interval sand grains of different-grain diameter and the mixing of shell
Thing；In this example, the termin al velocity calculating the sea sand sand grains obtained is all higher than 0.001m/s, less than 20m/s, it is contemplated that produce
The factor impacts such as efficiency, structure and particle diameter, the flow velocity rising medium stream respectively is 0.05m/s, 1m/s, 1.5m/s,
2.74m/s, 5.88m/s, it is thus achieved that particle size interval is respectively as follows: 0～75 μm, 75 μm～0.28mm, 0.28～1.0mm, 1～2.5mm
Mixture with sea sand sand grains and the shell of 2.5～4.75mm.
The inventive method can also be that the speed making medium stream reduces in the range of 0.001m/s-20m/s step by step, every grade of punching
The mixture obtained because rising with medium stream after brush is washed away by next stage medium stream again, and every grade is washed away in rear mixture because of sedimentation
And obtain is the interval sand grains of different-grain diameter and the mixture of shell.
Then destruction step is carried out: sea sand that the different-grain diameter that the most above-mentioned hydraulic classiciation step obtains is interval and shell
Mixture crushes respectively, utilizes the intensity of shell much smaller than the feature of the intensity of sand grains, makes intensity be less than the shell of sand grains
It is fractured into less fragment, and sand grains is broken few, can better ensure that the separation effect of the shell of follow-up separating step
Really.
Separate again: the most again wash away, with medium stream, the difference that the process obtained by destruction step is broken from bottom to top
The sea sand sand grains of particle size interval and the mixture of shell, owing to the size of shell has had obvious reduction, its terminal velocity is the brightest
Show and diminish, for the mixture of each particle size interval, as long as making the flow velocity of medium stream be slightly less than the sand of washed away particle size interval
The termin al velocity of grain, then the termin al velocity in mixture is much smaller than the shell of the medium stream flow velocity risen along with current
Upwards, in mixture, termin al velocity settles downwards more than the sand grains of the medium stream flow velocity risen, thus realizes sea sand sand grains
With the separation of shell, obtain the sea sand sand grains that different-grain diameter is interval respectively.For 75 μm～0.28mm in this example, 0.28～
1.0mm, the sea sand sand grains of 1～2.5mm and 2.5～these five particle size interval of 4.75mm and the mixture of shell, Jie used
The flow velocity of mass flow is respectively as follows: 0.8m/s, 1.3m/s, 2.5m/s, 5.0m/s.Above-mentioned only to the specific embodiment in the present invention in addition
Illustrate, but be not that protection scope of the present invention is made any pro forma restriction, every according to the design spirit in the present invention
Done equivalence change or modification, be all deemed to fall protection scope of the present invention.
Claims (7)
1. one kind novel except the method for shell, it is characterised in that comprise the following steps:
(1) screening: sieved by the screen cloth of conchiferous sea sand different pore size, obtains the interval sea sand sand grains of different-grain diameter and shellfish
The mixture of shell；
(2) broken: the sea sand sand grains in different-grain diameter interval step (1) obtained and the mixture difference of shell or part are respectively
Crushing, intensity is fractured into less fragment less than the shell of sea sand sand grains；Utilize the intensity of shell much smaller than sand grains
The feature of intensity, and sand grains hardness is higher, the most broken and broken seldom, then separate；
(3) separate: the sea sand sand grains in different-grain diameter interval step (2) obtained and shell mixture are respectively or part is entered respectively
Row sieves again so that it is crossing the sieve that sieve aperture is long and narrow, the shell in mixture falls from sieve aperture, and sea sand sand grains is intercepted and captured by screen cloth, real
Existing sea sand sand grains and the separation of shell；Horizontal the widest part of described long and narrow sieve aperture is not more than the described sea sand sand again sieved
Grain and the higher limit of the particle size interval of sand grains in the mixture of shell.
Method the most according to claim 1, it is characterised in that: the described long and narrow sieve aperture of described step (3) laterally the widest
Place is not more than the described sea sand sand grains again sieved and the lower limit of the particle size interval of sand grains in the mixture of shell.
3. one kind novel except the method for shell, it is characterised in that comprise the following steps:
(1) screening: sieved by the screen cloth of conchiferous sea sand different pore size, obtains the interval sea sand sand grains of different-grain diameter and shellfish
The mixture of shell；
(2) broken: the sea sand sand grains in different-grain diameter interval step (1) obtained and the mixture difference of shell or part are respectively
Crushing, intensity is fractured into less fragment less than the shell of sand grains；
(3) separate: the sea sand sand grains in different-grain diameter interval step (2) obtained and the mixture difference of shell or part are respectively
Again sieving, the aperture of the screen cloth used that again sieves no more than is sized the higher limit of the particle size interval of mixture；Mixture
In shell fall from sieve aperture, the sand grains of the sea sand in mixture is intercepted and captured by screen cloth, it is achieved containing shell sea sand sand grains and shell
Separate.
4. one kind novel except the method for shell, it is characterised in that comprise the following steps:
(1) screening: conchiferous sea sand sieve aperture is long and narrow and the different screen cloth of transverse width sieves, obtain different-grain diameter
Interval sea sand sand grains and the mixture of shell；
(2) broken: the sea sand sand grains in different-grain diameter interval step (1) obtained and the mixture difference of shell or part are respectively
Crushing, the shell making intensity be less than sand grains is fractured into less fragment；
(3) separate: step (2) is obtained broken after the interval sea sand sand grains of different-grain diameter and shell mixture respectively or
Part the most again sieve, the shell in mixture falls from sieve aperture, and the sand grains of sea sand is intercepted and captured by screen cloth, it is achieved sea sand sand grains and
The separation of shell；The aperture of the described sieve aperture again sieved is not more than the mixed of the described sea sand sand grains again sieved and shell
The higher limit of the particle size interval of sand grains in compound.
5. one kind novel except the method for shell, it is characterised in that comprise the following steps:
(1) screening: sieved by the screen cloth of conchiferous sea sand different pore size, obtains the interval sea sand sand grains of different-grain diameter and shellfish
The mixture of shell；
(2) broken: the sea sand sand grains in different-grain diameter interval step (1) obtained and shell mixture are respectively or part is entered respectively
Row is broken, and intensity is fractured into less fragment less than the shell of sand grains；
(3) waterpower separates: with the current risen, respectively or part washes away the sea sand in the different-grain diameter interval that step (2) obtains respectively
With the mixture of shell, the sedimentation velocity in mixture less than the shell of the flow velocity of ascending current along with on current direction, mixture
In sedimentation velocity settle downwards more than the sea sand sand grains of flow velocity of ascending current, thus realize sea sand and separate with shell；Institute
State the termin al velocity that the speed of current should be not more than the sand grains of washed away particle size interval, and heavy more than the shell that is broken
Fall end speed.
6. the method for the shell in removing sea sand, it is characterised in that comprise the following steps:
(1) hydraulic classiciation: the current being respectively adopted the different rising of speed wash away conchiferous sea sand, in mixture from bottom to top
Termin al velocity settle downwards with shell more than the sand grains of flow rate of water flow risen, in mixture, termin al velocity is less than
The sand grains of the water velocity risen and shell are along with, on current direction, obtaining the mixing of the interval sea sand sand grains of different-grain diameter and shell
Thing；
(2) broken: respectively or part is carried out respectively for the sea sand in different-grain diameter interval step (1) obtained and the mixture of shell
Broken, intensity is fractured into less fragment less than the shell of sand grains；
(3) separate: the mixture difference of the sea sand of each particle size interval that step (2) is obtained and shell or part mistake the most respectively
Sieve, the aperture of screen cloth used is less than being sized the higher limit of the particle size interval of sand grains in mixture, being broken in mixture
Shell fall from sieve aperture, sand grains is intercepted and captured by screen cloth, thus realizes the separation of sea sand sand grains and shell.
7. the method for the shell in removing sea sand, it is characterised in that comprise the following steps:
(1) hydraulic classiciation: the current being respectively adopted the different rising of speed wash away conchiferous sea sand, in mixture from bottom to top
Termin al velocity settle downwards with shell more than the sand grains of flow rate of water flow risen, in mixture, termin al velocity is less than
The sand grains of the flow rate of water flow risen and shell are along with, on current direction, obtaining the mixing of the interval sea sand sand grains of different-grain diameter and shell
Thing；
(2) broken: respectively or part is carried out respectively for the sea sand in different-grain diameter interval step (1) obtained and the mixture of shell
Broken, intensity is fractured into less fragment less than the shell of sand grains；
(3) separate: the most again wash away the difference that the process obtained by step (2) is broken respectively or partly from bottom to top with current
The sea sand sand grains of particle size interval and the mixture of shell, the termin al velocity in mixture is less than the shellfish of the flow rate of water flow risen
Shell is along with, on current direction, in mixture, termin al velocity settles downwards more than the sand grains of the flow rate of water flow risen, thus realizes
Sea sand sand grains and the separation of shell, obtain the sea sand sand grains that different-grain diameter is interval respectively；The speed of described current should be greater than being broken
The terminal velocity of broken shell, and it is not more than the termin al velocity of the sand grains of the particle size interval washed away.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009959.1A CN104772284B (en) | 2014-01-09 | A kind of novel except the method for shell | |
| JP2016563233A JP6309110B2 (en) | 2014-01-09 | 2015-01-09 | A new way to remove shells |
| PCT/CN2015/000022 WO2015103945A1 (en) | 2014-01-09 | 2015-01-09 | New method for removing shell |
| EP15735062.0A EP3159319A4 (en) | 2014-01-09 | 2015-01-09 | New method for removing shell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410009959.1A CN104772284B (en) | 2014-01-09 | A kind of novel except the method for shell |
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| CN104772284B true CN104772284B (en) | 2016-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202516604U (en) * | 2012-04-28 | 2012-11-07 | 杜建荣 | River sand crusher |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202516604U (en) * | 2012-04-28 | 2012-11-07 | 杜建荣 | River sand crusher |
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