CN1060236A - Method with sort asbestos with fluidized bed - Google Patents
Method with sort asbestos with fluidized bed Download PDFInfo
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- CN1060236A CN1060236A CN 91109905 CN91109905A CN1060236A CN 1060236 A CN1060236 A CN 1060236A CN 91109905 CN91109905 CN 91109905 CN 91109905 A CN91109905 A CN 91109905A CN 1060236 A CN1060236 A CN 1060236A
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Abstract
The present invention has provided the gas bubbling liquid bed that a usefulness has special construction, to the asbestos rough concentrate or contain the asbestos product and carry out selected method.This method adopts the method for homogenizing bed porosity, and this fibroid mineral of assurance asbestos are realized normal fluidisation fully; Take to suppress the measure of impact air-flow, make elutriation operation becoming controllable fiber dust removing or classification process in free spatial domain; Designed a kind of distributing plate with special structure, set up the mechanism that sorts of alternative sedimentary rock stone granulate, made this fluid bed have the dual performance efficiency that to carry out fiber desanding, dedusting or desanding, classification simultaneously.
Description
The present invention be with a kind of be the gas bubbling fluidized bed of working media with the air, to the asbestos rough concentrate or contain the method that the asbestos product carries out desanding, dedusting or desanding, classification.
In existing asbestos ore dressing fiber flow process, what the fiber desanding was used is that choosing method is inhaled in screening, or elutriator, specific gravity separator air classification method; Sieve classification methods such as various single-deck screens, multi-deck screen, drum sieve, awl shaft screen are then adopted in fiber classification and dedusting.Inhale the operation of blanking sand except that screening and have certain fiber dust removing usefulness, other fiber desanding, classification and dedusting operation all are to carry out as a process operation with single goal.
Asbestos rough concentrate institute fibre-bearing, sand grains and dust are mixed in together mutually, when being, they gather state, can not there be enough effective detachment dynamic in fellowship during by the screening campaign of the common decision of the suffered frictional force of materials flow, own wt and motion inertia force each other.In addition, even sand grains, dust has been realized and the separating of fiber, still need to see through the certain thickness bed of material and could arrive compass screen surface.Therefore carry out desanding, the dedusting of fiber with method for sieving, can not reach the higher efficiency of separation.
Method for sieving is used for fiber classification, and its result more has character at random.Because the monomer long fibre may see through sieve aperture fully, enters undersized product; And short fiber also may be stayed on the sieve owing to the easy conglomeration of asbestos.Like this, just made the relevant material handling amount that in the fiber classification flow process, occurs, pan feeding is fibrous and any fluctuation of fibre structure, all may change classification results.
Problem is, traditional asbestos ore-dressing technique has been used screening technique exactly at large, the operation hop count is many, technological process is complicated, quality control is difficult so that must bring to it, the shortcoming that the air facility is huge, and everything all causes the growth of production cost.
The objective of the invention is in order to introduce a kind of wind selection method that has the high efficiency of separation and have desanding, dedusting or the dual performance efficiency of desanding classification simultaneously for the asbestos dressing process.
Asbestos rough concentrate, or other contain the asbestos product, carry out selected processing with the gas bubbling fluidized bed can make under the abundant dispersity of wherein fiber, sand grains, dust, presses terminal velocity difference, realizes " freedom " gravity separation of monomer particle.The materials flow that this wind selection method can avoid method for sieving to exist is all the time gathers the shortcoming that state and sorting are short of power, and reaches the higher efficiency of separation.
Because two work wind speed at gas bubbling fluidized bed emulsion zone and free spatial domain physical presence, can sub-elect three products, so facilitate the present invention may be on the basis that makes full use of asbestos and contained rock particles physical difference thereof, provide a kind of fluid bed, make it to possess the dual performance efficiency that to carry out fiber desanding, dedusting or desanding, classification simultaneously with special construction.
Be used for selected this gas bubbling fluidized bed of asbestos, mainly form, i.e. fluidized bed body and distribution grid by two parts.The bed body is one to be made with metal, roughly the housing of rectangularity.For the needs of fluid mapper process,, change at several places along vertical bed body cross section.Owing to be divided into several chambers, be provided with dividing plate between each chamber.On two end fluidising chamber sidewalls, one is equipped with feeding mouth, and another is equipped with discharge gate, and they all are contained in the middle part on the height degree.Being provided with the warpage pipe on each top, chamber of this fluid bed, is the wind-collecting cover that has exhaust outlet more than the warpage pipe.Another critical piece distribution grid of fluid bed is the device of blowing in the bed body, and it often needs to satisfy technology some particular requirements to fluid mapper process.In this fluid bed, distribution grid is a planar sway, so it is equipped with transmission system, elastic fulcrum bar.Air inlet is equipped with in its bottom.
With regard to the physics-mechanics content of fluidized-bed process operating aspect, there is the emulsion zone that solid concentration is bigger in bed body space bottom, its last interface is approximately at the overfall lower edge nearby.Close boundary is above until exhaust outlet, is to be free spatial domain.The gas one solid two-phase mixture of emulsion zone has the flowable as liquid, thus after pan feeding feeds an end fluidising chamber, can pursue the chamber overflow, and unload to the bed body through the discharge gate of the other end fluidising chamber.
Below in conjunction with accompanying drawing the present invention is described.Accompanying drawing 1 is the fluid bed schematic diagram of sort asbestos.Selected asbestos rough concentrate or other contain the asbestos product, enter the fluid bed emulsion zone via material inlet (12).
Pan feeding is at emulsion zone, owing to be subjected to impact, the flushing of air-flow, owing to taking place to see accompanying drawing 2(20 with bed material, high air nozzle) and the collision of wall, constantly obtain loose, disperse, progressively change into littler grain and roll into a ball or the particle monomer.The bed material is carrying out strong fluidisation back-mixing motion in whole emulsion zone scope.Bubble constantly rises from distribution grid mutually nearby, is carrying a large amount of micro-size fractions, breaks through close boundary, it is sent into free spatial domain, and the bed material then in strong fluidisation, is constantly crossed the dividing plate between each chamber, next chamber is gone in overflow, and perhaps the discharge gate by the last chamber draws off fluid bed.Draw off the bed material of a body, experienced the assorting room in the bed, obtained purification, become the concentrate of fluid bed separation operation.
The bed material is carrying out two assorting rooms simultaneously in fluid bed, just on distribution grid, take place, by the distribution grid of friction-gravity separation mechanism decision for the selective deposition of rock particles and the bed air-flow that takes place in free spatial domain elutriation for micro-size fraction.The selective deposition of rock particles makes sand grains constantly emanate from bed, thereby becomes a kind of desanding process.The poplar of micro-size fraction is analysed and causes separating of the following fiber of dust or a certain grade and bed material, thereby becomes a kind of dedusting or classification process of fiber.The sand grains that sorts out draws off fluid bed through sand removing device (4) and sand removing hole (2).The dust that sorts out or contain the product of low grade asbestos is sent to by bed tail wind and falls cotton, dust collection device.
The elutriation of the fine component of bed its essence is, gas in the free spatial domain of fluid bed speed distributes and reaches homogenizing, and when having the blank pipe flow velocity, ascending air is carried less than the wind-force of the particle of this flow velocity for those terminal velocities.Under low wind speed, the what is called " elutriation component " that can be taken away by air-flow will only contain some fine dusts and very short fiber.So elutriation becomes the dust removal process for pan feeding.Under higher wind, the elutriation component also will comprise some long fibers, and poplar is analysed the air classification that also just thereupon becomes for pan feeding.
Obviously, relying on the bed elutriation to realize fiber dust removing or classification, all is a kind of air classification process.The key that guarantees grading effect is the homogenizing that controlled wind speed distributes.
Set up the desanding mechanism on the distribution grid, it is much complicated that problem seems, relies on the air classification principle merely, can only remove the big big sand grains of those terminal velocities.Therefore must on distribution grid, set up the new mechanism that to strengthen the rock particles deposition, claim it to make friction-gravity separation mechanism.
For strengthening desanding effect, the present invention has provided a kind of distribution grid (seeing accompanying drawing 2) with special construction and kinematic parameter.This distribution grid is equipped with high air nozzle (20), and plate face (19) is made with screen cloth, and whole distribution grid casing is made planar sway.Because air is sent into bed by upper space through the shower nozzle aperture, so the sand grains deposition will take place on the plate face.The planar sway of distribution grid makes material layering, forms tangible layer of sand interface.This layer of sand surface just will show different interaction properties with fiber to the follow-up rock particles that sinks both through forming.Sand grains sinks on this surface, and caulked in the trench that adjacent big sand grains forms, is difficult to be brought into bed again by air-flow.The linear dimension of asbestos fibre is big, and easily agglomerating, will swim on sand grains peak face after sinking.So the suction function of bubble phase tail is easy to it is brought into the bed depths.Like this, the friction on the distribution grid-gravity separation mechanism just makes the layer of sand surface that rock particles has been produced the selective deposition effect, to such an extent as to can separate the less rock particles of particle diameter from bed, improves the fiber desanding effect significantly.
Setting up the desanding mechanism by friction-gravity separation, is to make the selected deciding factor that possesses dual performance efficiency with bubbling fluidized bed of asbestos.
For realization has the assorting room of above-mentioned working mechanism, and make it to be strengthened, must take corresponding technical measures in the each several part structure of fluid bed.
At first be, the distribution grid that is used as planar sway impels bed material void rate distribution homogenizing, and nationality helps the conical bed structure of part bed body, realizes the strong fluidisation back-mixing of bed.
It is strong to contain asbestos product compressibility, and voidage is big and changeable; There is mutual mechanism between the fiber, is easy to conglomeration and is agglomerated into piece.The flyidization column evidence often forms the fixed air circulation road at the big voidage of bed place, promptly occur so-called " channel ".For this reason, the present invention has taked a kind of distribution grid of making planar sway, sees (5) among Fig. 1.The crankshaft eccentric of its transmission system is apart from being 15-20mm, and speed of crankshaft is 250-300r/min.Like this, the motion of distribution grid just makes its box body wall, flexible sealing (6), high air nozzle, among Fig. 2 (20), and the ejection gas jet, produce a kind of stirring in the bed bottom, shake effect, bed voidage obtains homogenizing thus, has avoided the generation of channel fully.
Is fixed bed body bottom 5-10 ° conical bed structure (7) as tapering, can significantly reduce wall friction, starts thereby can help fluidisation.Particularly, it can strengthen the bed back-mixing, helps strengthening fine component elutriation and rock particles deposition.
The second, take that the people is for causing layer of sand on the plate face, air intake is sent into the distributing plate structure of bed by high air nozzle.
For set up friction-gravity separation mechanism on distribution grid, the sand layer thickness on the distribution grid is 10-20mm, is controlled by the height of (21) among the sand weir Fig. 2 that overflows.The aperture of high air nozzle (20) is in order to form the air-flow dead band on the plate face, to cause layer of sand to the height 60-100mm of distribution grid sieve plate (19).Sieve plate is made with the 24-32 eye mesh screen, makes the sand grains in the layer of sand that greater particle size be arranged, in order to desanding.The upper and lower rock particles of sieve plate is drawn off by the sand removing hole (2) of two sediment outflow passages (22,23) and strict lock gas respectively.
The 3rd, adopt by excessive sand weir (21), and have the flaring section and become the sand removing device (4) of sediment outflow passage (23) formation of U-shaped bending.
The minimum thickness of layer of sand can only be controlled in excessive sand weir.The sediment outflow ability is too small, can strengthen sand layer thickness on the distribution grid, unfavorable desanding.The sediment outflow ability is excessive, and vertically the layer of sand surface of section is low excessively can to make sediment outflow passage (23), so that the fiber on this sand face of swimming will be carried secretly by the sediment outflow materials flow because of energy fluidizing not and draw off.Going up the terminal base plate of sediment outflow passage (23) must adjust for this reason so that keep that distribution grid sieve plate (19) is gone up and sediment outflow passage (23) vertically section medium sand laminar surface height and excessive sand weir (21) are pushed up substantially flush.
The 4th, the wind speed profile with in the free spatial domain of warpage pipe pressure homogenizing prevents to carry secretly generation.
The impact air-flow that is formed by the explosion of bubble phase has higher speed.For making this impact the decay naturally of gas speed, reach the wind speed homogenizing, need the free spatial domain height that value is considerable.
Therefore, the present invention adopts that (10) suppress this impact air-flow among warpage pipe Fig. 1, forces the distribution of homogenizing wind speed, is general factory building floor height acceptable fluid bed height overall so that draw one.
The warpage plate is to become 60 ° by one group with level, and the plate of warpage is made back and forth.Spacing between adjacent two plates is 25-35mm.The length of the every section warpage plate ratio of spacing therewith is 2-2.5.Inertia force will make and be suspended in sinking to warpage wooden partition face than corase particles in the air-flow, then at the gravity effect bed that falls back.Because rock particles and fiber have different character for the collision of wall, raise folding so dust will be subjected to selectivity, and help fiber dust removing.
The 5th, adopt the multi-cell fluidized bed structure
The theory and practice of Fluidization Engineering proves that the single chamber fluid bed is unfavorable for the time of staying distribution homogenizing of particle in bed, thereby also just is unfavorable for the selected of fiber.
What Fig. 1 provided is 3 Room fluid beds.In engineering in fact, fluid bed suits as the structure of Room 3 to 5.Both can guarantee particle time of staying distribution homogenizing, it is complicated that fluidized-bed structure also is unlikely.
The multi-cell fluidized bed materials flow, the air-flow interface increases, and must guarantee that strictness is airtight, and bed pressure drop has notable difference between each chamber of multicell bed, and each chamber air intake valve is control automatically, regulates its open degree.
The bed process of sort asbestos is compared with conventional method, has significant superiority.
1, the method for sort asbestos with fluidized bed has the dual performance efficiency of desanding, dedusting or desanding, classification simultaneously, can significantly simplify beneficiation flowsheet.
2, bed process has the high efficiency of separation, can improve product quality, reduces the operation hop count.
Through the fluid bed one-stop operation, can remove the sand grains in the fiber fully.Yet according to 1988 annual asbestos country sampling observation report report, what sand grain content surpassed the national Specification index in each ore deposit commodity asbestos of China accounts for 53.33% of substandard product sum unexpectedly, accounts for and is examined 29.09% of product sum.Such quality condition appears in the commodity cotton that is no less than two sections desanding operations through beneficiation flowsheet, and as can be seen, the desanding efficiency of traditional handicraft is not high.
Through industrial fluid bed single treatment, asbestos-reduction of 0.075mm grain size content, can reach 6-10%.Use the method for sieving dedusting, it is remarkable that screening percentage often takes place, but-0.075mm grain size content section has the situation of significant change.
3, asbestos are through fluidized bed processing, and fiber is loose strongly, has removed sand grains, has removed the absorption micronic dust.The operation product can reach technic index preferably in follow-up screening dedusting operation.
4, the fluid bed movement parts is few, and the airtight measure of dirt that need not to set up defences in addition helps reducing maintenance load and conciliates the dustproof problem of final election factory.
Embodiment: use method of the present invention, processing China mine elutriator concentrate obtains following index.
1, the minimum fluidizing velocity 0.38m/s of this product in fluid bed.
2, the working flow rate 0.608m/s during selected this product of fluid bed.
3, sand content: test material 1.3%
4, fluid bed operation concentrate 0
5, after the one-stop operation-the reduction 6.18-10.28%* of 0.075mm grade
* extrapolate according to analog theory, product is expected the technical indicator that reaches on large-scale plant.
Description of drawings:
The fluid bed schematic diagram of Fig. 1, sort asbestos
1, distribution grid pole 9, increaser
2, sand removing hole 10, warpage pipe
3, distribution grid transmission system 11, wind-collecting cover
4, sand removing device 12, material inlet
5, distribution grid 13, discharge gate
6, flexible sealing 14, interventricular septum plate
7, conical bed section 15, air inlet
8, straight bed section such as
Fig. 2, distribution grid and sand removing device schematic diagram
16, air inlet adjustment valve 20, high air nozzle
17, inlet air plenum 21, the sand weir of overflowing
18, dividing plate 22, following sediment outflow passage
19, sieve plate 23, last sediment outflow passage
Claims (7)
1, uses the method for sort asbestos with fluidized bed, be with a kind of be the gas bubbling fluidized bed of working media with the air, to the asbestos rough concentrate or contain the asbestos product and carry out desanding, the method of dedusting or desanding, classification, feature of the present invention is: make the fiber, sand grains and the dust that contain in the asbestos product under abundant dispersity, on the distribution grid of fluid bed, rub--gravity separation and carry out the method that wind speed is forced the homogenizing air classification in free spatial domain.
2, method according to claim 1, it is characterized in that: friction-gravity separation is on the distribution grid of fluid bed, by the layer of sand surface for the common decision of suction function of tail mutually of bubble in the frictional property difference of rock particles and asbestos fibre and the fluid bed emulsion zone.
3, the fluid bed of sort asbestos is characterized in that: distribution grid and part bed body with planar sway adopt pyramidal structure; The artificial layer of sand that forms on the plate face of distribution grid, air intake is sent into the distributing plate structure of bed by high air nozzle; Sand removing device is by excessive sand weir and have the flaring section, and becomes the sediment outflow passage of U-shaped bending to constitute; With the wind speed profile in the free spatial domain of warpage pipe unit pressure homogenizing; And employing multi-cell fluidized bed structure.
4, fluid bed according to claim 3, it is characterized in that: the distribution grid of planar sway is apart from 15-20mm by crankshaft eccentric, speed of crankshaft 250-300r/min realizes, and the fixed bed body hypomere that will join with flexible sealing is 5-10 ° conical bed structure as tapering.
5, fluid bed according to claim 3, it is characterized in that: distribution grid is made by the 32-24 eye mesh screen, air intake is sent into the distributing plate structure of bed by the high air nozzle that exceeds distribution grid 60-100mm, and artificially forms the thick layer of sand of 10-20mm on distribution grid plate face.
6, fluid bed according to claim 3 is characterized in that: become 60 ° in free spatial domain with level by some, the plate of warpage is made back and forth, and the spacing between two plates is 25-35mm, and every section warpage tube passage length is the warpage pipe unit of 2-25 with wide ratio.
7, fluid bed according to claim 3 is characterized in that: fluid bed adopts the 3-5 cell structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109905 CN1060236A (en) | 1991-10-22 | 1991-10-22 | Method with sort asbestos with fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109905 CN1060236A (en) | 1991-10-22 | 1991-10-22 | Method with sort asbestos with fluidized bed |
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| Publication Number | Publication Date |
|---|---|
| CN1060236A true CN1060236A (en) | 1992-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91109905 Pending CN1060236A (en) | 1991-10-22 | 1991-10-22 | Method with sort asbestos with fluidized bed |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437829A (en) * | 2014-10-21 | 2015-03-25 | 王玉亮 | Wet technology for recycling asbestos and mineral fibers in asbestos mineral tailings |
| CN104501531A (en) * | 2014-12-26 | 2015-04-08 | 浙江汇隆新材料股份有限公司 | Fully-fluidized time-averaging delivery pre-crystallizer |
| CN104550026A (en) * | 2014-12-18 | 2015-04-29 | 杨连明 | Method for sorting limestone chips by utilizing fluidized bed |
| CN109513521A (en) * | 2019-01-25 | 2019-03-26 | 王玉亮 | A kind of ore-dressing technique recycling iron from asbestos tailings |
| CN113712215A (en) * | 2020-12-07 | 2021-11-30 | 固原康恒农产品加工有限公司 | Sand sorting box for apricot kernel processing |
-
1991
- 1991-10-22 CN CN 91109905 patent/CN1060236A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437829A (en) * | 2014-10-21 | 2015-03-25 | 王玉亮 | Wet technology for recycling asbestos and mineral fibers in asbestos mineral tailings |
| CN104437829B (en) * | 2014-10-21 | 2018-03-06 | 王玉亮 | The wet processing of asbestos and mineral fibres is reclaimed from asbestos-like minerals mine tailing |
| CN104550026A (en) * | 2014-12-18 | 2015-04-29 | 杨连明 | Method for sorting limestone chips by utilizing fluidized bed |
| CN104501531A (en) * | 2014-12-26 | 2015-04-08 | 浙江汇隆新材料股份有限公司 | Fully-fluidized time-averaging delivery pre-crystallizer |
| CN104501531B (en) * | 2014-12-26 | 2017-05-10 | 浙江汇隆新材料股份有限公司 | Fully-fluidized time-averaging delivery pre-crystallizer |
| CN109513521A (en) * | 2019-01-25 | 2019-03-26 | 王玉亮 | A kind of ore-dressing technique recycling iron from asbestos tailings |
| CN113712215A (en) * | 2020-12-07 | 2021-11-30 | 固原康恒农产品加工有限公司 | Sand sorting box for apricot kernel processing |
| CN113712215B (en) * | 2020-12-07 | 2023-05-23 | 固原康恒农产品加工有限公司 | Sand sorting box for apricot kernel processing |
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