CN101352696B - Hindered settling and sorting methods of light materials in hydraulic concrete coarse aggregate - Google Patents
Hindered settling and sorting methods of light materials in hydraulic concrete coarse aggregate Download PDFInfo
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- CN101352696B CN101352696B CN2008100511514A CN200810051151A CN101352696B CN 101352696 B CN101352696 B CN 101352696B CN 2008100511514 A CN2008100511514 A CN 2008100511514A CN 200810051151 A CN200810051151 A CN 200810051151A CN 101352696 B CN101352696 B CN 101352696B
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Abstract
The invention relates to a hindered-settling separation method for the light substance of hydraulic concrete coarse aggregate, which pertains to a separation method of hydraulic concrete coarse aggregate in hydropower engineering. The method comprises: 1. separation equipment is selected, a slurry pump is operated to fill a flume with water; and a bucket-typed elevator is operated to run smoothly; a belt conveyer is operated, and coarse aggregate containing light substance is fed into the flume by a feeding inlet; a diverter valve and a turbulent board are adjusted according to the feeding quantity and the density of the light substance. The method of the invention has the advantages that the light substance with different densities can be removed. Under the situation of proper inverted water flow and turbulent condition, the separation efficiency can reach 100 percent, and the addition of the cost of the coarse aggregate is respectively reduced by 41 percent compared with the other two techniques.
Description
Technical field
The invention belongs to the method for separating of hydraulic concrete coarse aggregate in the Hydraulic and Hydro-Power Engineering.
Background technology
" the Hydraulic and Hydro-Power Engineering natural building material is reconnoitred rules " be middle regulation (SL251-2000): do not allow to contain light materials in the coarse aggregate.Why making afore mentioned rules in the rules, is because light materials all can have a negative impact to concrete intensity, durability, deformation performance, jeopardizes dam safety.But, usually can run into the situation that light materials exceeds standard in the coarse aggregate in the construction of hydropower plant.All contain a large amount of apparent densities greater than 1g/cm in the coarse aggregate as power station, Longjiang, Yunnan, the use of Zi Pingpu power station, Sichuan
3And can not be by the wooden light materials of washing removing.
In " shop, purple level ground engineering aggregate contains the research and the processing of wood chip problem " literary composition that the Sichuan Province water conservancy and hydropower survey and design research institute prospecting Yang Pei of branch loyalty was delivered in " Sichuan water conservancy " 01 phase in 2003, contain the wood chip situation with regard to segment mark dwarf Luo Ba stock ground on purple level ground shop water-control project 1#, the 2# diversion tunnel, consider its influence to high-velocity flow district concrete quality, carry out the contrast test achievement analysis of different wood chip content and normal concrete in the concrete, proposed sandstone aggregate system rinsing flow process treatment process.To the processing method that contains wood chip gravel building stones in the engineering mainly is that the rinsing process flow process is set in the sandstone aggregate system, makes aggregate wood chip content≤0.05%, and the 5mm～40mm after the screening contains the wood chip aggregate, can be used for non-high-velocity flow district concrete.This shows that the treatment process of this project can not be removed wood chip fully.
The purpose of light materials in the coarse aggregate is removed by more external countries, and is main in order to produce qualified regeneration aggregate.As the U.S., earlier regeneration aggregate is put into dry mixing in the revolving drum mixer, and then add other components, think that this is a kind of feasible method from light materials such as the residual mortars of regeneration aggregate elimination.
Important step in Germany's regeneration aggregate production is to use built on stilts Magnetic Isolation machine that iron plate is separated; Adopt air separation technology, from the original mixture that contains different salvage materials, tell recovery sand, the light material (comprising cardboard, the scraps of paper, wood chip and foam concrete) of 0～4mm; Adopt the wet process technology, can also isolate density less than 2g/cm
3Material.
The external wet process technology that regeneration aggregate production is adopted Jie's treatment technology of attaching most importance to usually, promptly the density of separating medium is bigger, is generally 1.95～2.0g/cm
3Higher and the complex process of this treatment technology cost, the actual conditions of not too suitable China.
Summary of the invention
The invention provides the hindered settling and sorting methods of light materials in a kind of hydraulic concrete coarse aggregate, can not remove the problem of light materials such as wood chip fully to solve present treatment process.The technical scheme that the present invention takes is: comprise the following steps:
One, selects screening installation for use, adopt the screening installation of following structure: the sealing skewed slot is connected with bucket elevator, fixedly connected adjustable turbulence plate up and down in this sealing skewed slot, feeding mouth is connected with this sealing skewed slot, this sealing skewed slot top has light materials outlet, bottom to be connected with circulating water chennel by water pipe through the slag stock pump, on this water pipe Water flow adjusting valve is arranged, following funnel is arranged at the outlet bottom of bucket elevator, and the pan feeding belt feeder is positioned at the top of feeding mouth; The sealing skewed slot is the rectangle sealing cell body at 50 ° at inclination angle, and cross dimensions is 600mm * 600mm, the maximum 300mm of pan feeding particle diameter; Alternative aggregate enters cell body by belt feeder by feeding mouth, and aggregate washing medium is a pressure water stream, injects by the slag stock pump in the cell body bottom, and the light materials that the realization apparent density is different when aggregate is mobile in skewed slot mesohigh current separates with aggregate;
Two, open the slag stock pump, make the skewed slot water-filling;
Three, open bucket elevator, make it to run well;
Four, open belt conveyor, contain the light materials aggregate and enter skewed slot by charging aperture;
Five, according to feeding and light materials Auto-regulating System of Density of Heavy Medium flow divider, the adverse current water yield that enters skewed slot and the material amount and the light materials density that enter skewed slot are complementary, play the effect of retardance light materials sedimentation; In aggregate production capacity is under the prerequisite of 120t/h, lightweight density≤1.2g/cm
3The time, sorting discharge is 380m
3During/h; Lightweight density is 1.2g/cm
3～1.6g/cm
3, sorting discharge 〉=420m
3/ h; As lightweight density 〉=1.6g/cm
3The time, sorting discharge is 500m
3/ h;
Six, regulate turbulence plate: the height of projection of top turbulence plate is 1/4 of the skewed slot section length of side, the height of projection of bottom turbulence plate is 1/8～1/6 of the skewed slot section length of side, what the disorderly degree of current can be smashed fully enter skewed slot contains the light materials aggregate, thus make light materials with reverse ascending current on the lenient side material outlet discharge.
By regulating flow divider and turbulence plate, can remove the light materials of different densities.Test is 0.88g/cm to apparent density
3, 1.0g/cm
3～1.2g/cm
3, 1.42g/cm
3～1.54g/cm
3, 1.82g/cm
3Four kinds of different light materials carried out sorting, under the suitable flow and turbulent condition of reverse current, the efficiency of separation all can reach 100%.
Key technology of the present invention is 1. to adopt the medium of the reverse current opposite with containing the light materials aggregate direction of motion as hindered settling, has blocked the sedimentation of light materials in the aggregate; 2. on skewed slot, settle turbulence plate, can regulate reverse flow-shape; 3. the flow of reverse water can be regulated by flow divider.
The effect of turbulence plate makes the ascending current in the skewed slot form turbulent flow, make the material loosening that enters, and keep just quickening sedimentation, the gravel slumping speed that apparent density is big is higher than ascending water speed, proposed by the dehydration bucket elevator after the gravel slumping, the light materials that apparent density is little is then discharged with the High-Pressure Water overflow.
The advantage of patent of the present invention, effect
1. the difference of the present invention and other sorting process
In order to investigate the effect of hindered settling and sorting technology, adopt pneumatic separating technology and jigging method sorting technology to carry out the sorting of aggregate and light materials respectively to aggregate of the same race, details are as follows:
1.1 combined type dry separation (pneumatic separating)
Combined type dry separation technology is to adopt autogenous medium (contained fine grained in the selected material) and air to form the sorting of gas-solid two-phase blending agent; Make the sorting material flip-flop movement of spinning by mechanical oscillation, form repeatedly sorting; Make full use of the interactional buoyancy effect of the particle that bed density produced that improves gradually and carry out sorting.
5mm～40mm coarse aggregate 580kg is adopted in test, and apparent density is＞1g/cm
3Wood chip 10.7kg.Through after 1 selection by winnowing, spendable gravel only accounts for 65～78% of whole gravels, and remainder (22%～35%) gravel should carry out sorting or again as abandoning material.
1.2 jigging method sorting
The operation principle of jigging method is that outer power driving sieve plate (or material) moves up and down in aqueous medium, causes material periodically loose, realizes pressing density separation.
The test raw material that are used for sorting are 5mm～40mm aggregate 11.6t; Apparent density is＞1g/cm
3Wood chip 55kg.Adopt the jigging method through 1 sorting, wood chip is removed 52kg, removes rate 94.5%.
1.3 hindered settling method of the present invention sorting
The test aggregate that is used for sorting is particle diameter 5mm～40mm and is mixed with gangue (apparent density 1.82g/cm
3) and the gravel 3t of ickings, wooden foreign material 13.6kg (soak full water after quality).(density is 0.88g/cm to impurity in the aggregate behind the full water in order to adopt ash
3) etc. the wood chip 7.5kg of the bigger material of apparent density processing, apparent density 1.0g/cm
3～1.2g/cm
3Natural wood foreign material 6.1kg, apparent density is 1.42g/cm
3～1.54g/cm
3Coal cinder 11.0kg.
The hindered settling test is distinguished by sorting discharge and is carried out altogether 3 times, and sorting discharge is respectively 500m
3/ h, 420m
3/ h, 380m
3/ h.
From three times the test statistics as can be known, as sorting discharge 〉=380m
3During/h, the separation rate of wooden foreign material can reach 100% in the aggregate.As sorting discharge 〉=420m
3During/h, apparent density is 1.42g/cm
3～1.54g/cm
3Coal cinder separation rate 100%.When sorting discharge is 500m
3During/h, apparent density is 1.82g/cm
3Gangue separation rate 100%, separated the coming of the less stone of a small amount of density arranged simultaneously.
2. the effect of hindered settling and sorting technology of the present invention
2.1 adopt hindered settling and sorting technology and special-purpose sorting machine,, can remove the light materials of different densities by regulating flow divider and turbulence plate.Test is 0.88g/cm to apparent density
3, 1.0g/cm
3～1.2g/cm
3, 1.42g/cm
3～1.54g/cm
3, 1.82g/cm
3Four kinds of different light materials carried out sorting, under suitable reverse water flow and turbulent condition, the efficiency of separation all can reach 100%.
2.2 the aggregate cost increases and reduces by 41% (comparing with jigging technology) and 55% (comparing with wind election process) respectively than other two kinds of technologies.
Description of drawings
The screening installation structural representation that accompanying drawing adopts for the present invention.
The specific embodiment
Comprise the following steps:
One, selects screening installation for use, adopt the screening installation of following structure: sealing skewed slot 5 is connected with bucket elevator 2, fixedly connected adjustable turbulence plate 6 up and down in this sealing skewed slot, feeding mouth 1 is connected with this sealing skewed slot, this sealing skewed slot top has light materials outlet 9, bottom to be connected with circulating water chennel 4 by water pipe through slag stock pump 3, on this water pipe Water flow adjusting valve is arranged, following funnel 11 is arranged at outlet 10 bottoms of bucket elevator 2, and pan feeding belt feeder 8 is positioned at the top of feeding mouth 1; The sealing skewed slot is the rectangle sealing cell body at 50 ° at inclination angle, and cross dimensions is 600mm * 600mm, the maximum 300mm of pan feeding particle diameter; Alternative aggregate enters cell body by belt feeder by feeding mouth, and aggregate washing medium is a pressure water stream, injects by the slag stock pump in the cell body bottom, and the light materials that the realization apparent density is different when aggregate is mobile in skewed slot mesohigh current separates with aggregate;
Two, open the slag stock pump, make the skewed slot water-filling;
Three, open bucket elevator, make it to run well;
Four, open belt conveyor, contain the light materials aggregate and enter skewed slot by charging aperture;
Five, according to feeding and light materials Auto-regulating System of Density of Heavy Medium flow divider, the adverse current water yield that enters skewed slot and the material amount and the light materials density that enter skewed slot are complementary, play the effect of retardance light materials sedimentation; In aggregate production capacity is under the prerequisite of 120t/h, lightweight density≤1.2g/cm
3The time, sorting discharge is 380m
3During/h; Lightweight density is 1.2g/cm
3～1.6g/cm
3, sorting discharge 〉=420m
3/ h; As lightweight density 〉=1.6g/cm
3The time, sorting discharge is 500m
3/ h.
Six, regulate turbulence plate: the height of projection of top turbulence plate is 1/4 of the skewed slot section length of side, the height of projection of bottom turbulence plate is 1/8～1/6 of the skewed slot section length of side, what the disorderly degree of current can be smashed fully enter skewed slot contains the light materials aggregate, thus make light materials with reverse ascending current on the lenient side material outlet discharge.
Claims (1)
1. the hindered settling and sorting methods of light materials in the hydraulic concrete coarse aggregate is characterized in that, comprises the following steps:
One, selects screening installation for use, adopt the screening installation of following structure: the sealing skewed slot is connected with bucket elevator, fixedly connected adjustable turbulence plate up and down in this sealing skewed slot, feeding mouth is connected with this sealing skewed slot, this sealing skewed slot top has light materials outlet, bottom to be connected with circulating water chennel by water pipe through the slag stock pump, on this water pipe Water flow adjusting valve is arranged, following funnel is arranged at the outlet bottom of bucket elevator, and the pan feeding belt feeder is positioned at the top of feeding mouth; The sealing skewed slot is the rectangle sealing cell body at 50 ° at inclination angle, and cross dimensions is 600mm * 600mm, the maximum 300mm of pan feeding particle diameter; Alternative aggregate enters cell body by belt feeder by feeding mouth, and aggregate washing medium is a pressure water stream, injects by the slag stock pump in the cell body bottom;
Two, open the slag stock pump, make the skewed slot water-filling;
Three, open bucket elevator, make it to run well;
Four, open belt conveyor, contain the light materials aggregate and enter skewed slot by charging aperture;
Five, according to feeding and light materials Auto-regulating System of Density of Heavy Medium Water flow adjusting valve, the adverse current water yield that enters skewed slot and the material amount and the light materials density that enter skewed slot are complementary, play the effect of retardance light materials sedimentation; In aggregate production capacity is under the prerequisite of 120t/h, lightweight density≤1.2g/cm
3The time, sorting discharge is 380m
3/ h; 1.2g/cm
3＜lightweight density＜1.6g/cm
3The time, sorting discharge 〉=420m
3/ h; As lightweight density 〉=1.6g/cm
3The time, sorting discharge is 500m
3/ h;
Six, regulate turbulence plate: the height of projection of top turbulence plate is 1/4 of the skewed slot section length of side, the height of projection of bottom turbulence plate is 1/8～1/6 of the skewed slot section length of side, what the disorderly degree of current can be smashed fully enter skewed slot contains the light materials aggregate, thus make light materials with reverse ascending current on the lenient side material outlet discharge.
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|---|---|---|---|
| CN2008100511514A CN101352696B (en) | 2008-09-10 | 2008-09-10 | Hindered settling and sorting methods of light materials in hydraulic concrete coarse aggregate |
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|---|---|---|---|
| CN2008100511514A CN101352696B (en) | 2008-09-10 | 2008-09-10 | Hindered settling and sorting methods of light materials in hydraulic concrete coarse aggregate |
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| CN101352696B true CN101352696B (en) | 2010-11-17 |
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| CN102641774A (en) * | 2012-03-27 | 2012-08-22 | 马钢(集团)控股有限公司 | Bottom outflow treating device applied to material water washing system and process method for treating bottom outflow by using bottom outflow treating device |
| CN103846153A (en) * | 2012-11-29 | 2014-06-11 | 宝钢集团新疆八一钢铁有限公司 | Method for improving clean coal yield through adding underflow pump to sludge pit bucket elevator |
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