CN113351342A - Stirring station waste slurry water sectional type grinding recycling process and device thereof - Google Patents
Stirring station waste slurry water sectional type grinding recycling process and device thereof Download PDFInfo
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- CN113351342A CN113351342A CN202110622051.8A CN202110622051A CN113351342A CN 113351342 A CN113351342 A CN 113351342A CN 202110622051 A CN202110622051 A CN 202110622051A CN 113351342 A CN113351342 A CN 113351342A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
- B02C21/007—Disintegrating plant with or without drying of the material using a combination of two or more drum or tube mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
- B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
- B02C2201/063—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage for waste water or sewage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical Kinetics & Catalysis (AREA)
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- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sectional type grinding and recycling process and a sectional type grinding and recycling device for waste slurry of a mixing plant. The process comprises the following steps: s1, screening; s2, carrying out concentration classification; s3, crushing and screening; s4, coarse grinding; s5, fine grinding; the device comprises a screening machine, a thickening concentrator, a rough grinding machine, a fine grinding machine and a finished product tank; the thickening thickener is respectively communicated with the sieving machine, the coarse grinding machine and the fine grinding machine; the fine grinding machine is respectively communicated with the coarse grinding machine and the finished product tank; the inside of the thickening thickener is provided with a ceramic filtering device connected with a vacuum negative pressure device. The method takes the waste slurry generated by flushing a tank truck, a field and the like in a mixing station as a raw material, the energy consumption of grinding is obviously reduced through dense concentration and sectional grinding, the grinding effect and efficiency are obviously improved, the prepared waste slurry has an excellent filling effect, a part of rubber materials are replaced on the premise of not reducing the strength grade, the production cost of enterprises is reduced while the solid waste is recycled, and the method has good cost reduction and effect enhancement effects.
Description
Technical Field
The invention belongs to the field of production of premixed concrete. In particular to a sectional type grinding and recycling process and a sectional type grinding and recycling device for waste slurry of a mixing plant.
Background
At present, the waste slurry water is the main type generated by the waste of the mixing plant, and the disposal of the waste slurry water is unfavorable and easily causes environmental pollution. The waste slurry water of the mixing plant contains a large amount of sandstone aggregates and powder with certain hydration activity, and has recycling value. The processing of present mixing plant to waste slurry water is mainly that the multistage sedimentation tank of construction sets up the stirring so that its homogenization, and waste slurry contains the wayward admittedly for the production of concrete can have the wayward problem, often pours into the clear water into in the waste slurry tank, not only does not realize the decrement, makes waste slurry increase to some extent on the contrary.
In the prior art, when the waste residue of the mixing plant is treated, part of process treatment effects are poor, the residual waste slurry also contains a large amount of powder with hydration activity, in addition, the waste slurry water is homogenized and filtered and then directly reused for producing concrete products, the slurry in the waste slurry water is not refined and graded, and the problems of solid content fluctuation of the waste slurry and general recycling added value exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a sectional type grinding and recycling process and a sectional type grinding and recycling device for waste slurry of a mixing station.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Separating particles with the particle size larger than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding a settling agent into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.01-0.05 MPa for 60-90 min, carrying out dense classification, and collecting the second-stage waste slurry flowing out of the middle-lower part and the third-stage waste slurry flowing out of the bottom after classification;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Coarsely grinding the three-section waste pulp and the particles obtained in the step S3 in a coarse grinding machine for not less than 30min to obtain five-section waste pulp; the three-section waste slurry is a bottom component separated by a thickening concentrator, the solid component of the three-section waste slurry is relatively fine sand, the chemical components of the three-section waste slurry are mainly silicon oxide and the like, the grinding difficulty is higher, the coarse grinding pretreatment is adopted, the grinding pressure of fine grinding can be reduced, and the grinding efficiency can be improved;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then finely grinding in a fine grinding machine for 10-30 min to obtain micro-nano-scale slurry; the two-stage waste slurry is a component separated from the middle lower part of the thickener, the main components of the solid in the two-stage waste slurry are powder materials with small grain size, such as cement, fly ash and the like, and the two-stage waste slurry is more targeted by adopting fine grinding and has better grinding effect.
The solid particles with the particle size distribution of less than 10 microns in the micro-nano-scale slurry prepared by the invention account for not less than 50%, the solid particles in the ground slurry are small, and the micro-nano-scale slurry is used for concrete production, can effectively fill the pores in the concrete, enables the concrete to be more compact, and further improves the strength and durability of the concrete.
Further, overflow clear liquid with the solid mass concentration of less than 0.1 percent is generated in the concentration classification process.
Further, the solid mass concentration of the three-stage waste slurry is not less than 20%.
Furthermore, the addition amount of the settling agent is 0.01-0.1% of the mass of the solid in the first-stage waste slurry.
Further, the settling agent is at least one of polyaluminum ferric chloride, polyferric sulfate, polyaluminum sulfate, polysilicate and polyacrylamide.
Furthermore, grinding aids are added in the coarse grinding process and the fine grinding process; the dosage of the grinding aid in the coarse grinding process is 0.01-0.2% of the mass of the solid in the three-stage waste pulp; the dosage of the fine grinding aid is 0.01-0.2% of the total solid mass in the two-stage waste slurry and the five-stage waste slurry.
A stirring station waste slurry water sectional type grinding recycling device comprises a screening machine, a thickening concentrator or a separation concentrator, a coarse grinding machine, a fine grinding machine and a finished product tank; the thickening thickener is respectively communicated with the sieving machine, the coarse grinding machine and the fine grinding machine; the fine grinding machine is respectively communicated with the coarse grinding machine and the finished product tank; the inside of the thickening thickener is provided with a ceramic filtering device connected with a vacuum negative pressure device.
Furthermore, a funnel-shaped material collecting cavity is arranged in the thickening thickener; the bottom of the material collecting cavity is provided with a bottom flow port; the top of the thickener is provided with a third rotating shaft extending to the bottom flow port; and one end of the third rotating shaft close to the underflow port is provided with a stirring blade.
Further, a ceramic filtering device is arranged on the side wall of the aggregate cavity; the ceramic filter device comprises a ceramic filter plate and a water collecting cavity connected with the vacuum negative pressure device.
Furthermore, a scraper is also arranged on the rotating shaft; the scraper and the ceramic filter plate can be jointed and slide.
Furthermore, the top of one side of the thickening thickener is provided with a clear water overflow port communicated with the clear water tank; the middle part of the other side is provided with a side wall slurry outlet communicated with the fine grinding machine; the underflow port at the bottom of the thickener is communicated with the rough mill.
Furthermore, a first motor is arranged at the outer top of the thickening concentrator and connected with the third rotating shaft to drive the third rotating shaft to rotate.
Further, the pump is one or more of a screw pump, a slurry pump and a sewage pump, and can convey waste slurry with the maximum solid particle size of more than 0.6 mm.
Furthermore, the coarse grinding machine and the fine grinding machine are internally provided with spherical grinding media, the size of a middle gap is generally smaller than the feeding size of the grinding material when the four spherical grinding media are stacked into a cube, and the calculation is carried out according to a longer direction when the length-diameter ratio of the feeding granularity is inconsistent.
Further, a pipeline valve is arranged between the coarse grinding machine and the fine grinding machine.
Further, the diameter of the coarse mill spherical grinding media is larger than that of the fine mill, and the mass density of the coarse mill spherical grinding media is larger than that of the fine mill.
The large-particle-size particles separated by the thickening concentrator contain a large amount of sand inside, the requirement on grinding equipment is high, and a heavy high-strength spherical grinding medium is adopted for coarse grinding, so that the grinding effect and efficiency are improved; the particles with smaller particle size after dense classification are mainly cement, fly ash, argillaceous substance and the like, the particle size is smaller, and the grinding adopts a spherical grinding medium with smaller diameter and high toughness, which is carried by a grinding machine, so that the energy consumption can be effectively reduced, and the grinding efficiency can be improved.
Further, the vacuum negative pressure device comprises a vacuum pump and a clean water tank positioned below the vacuum pump.
Furthermore, the screening machine, the pump machine, the thickening machine or the separating and concentrating device, the rough grinding machine, the fine grinding machine, the cylinder body, the element and the pipeline which are in contact with the waste slurry in the finished product tank are made of materials which need to bear the pH value of more than 11.
Further, the device comprises a grading feeding device and a concentration device which are communicated; the grading feeding device is provided with an air inlet and a waste slurry inlet; gas and waste slurry entering from the air inlet and the waste slurry inlet can form rotational flow in the grading feeding device;
the concentration device comprises a cylinder body; a filter pressing device is arranged at the top of the cylinder body, and a material collecting cavity positioned below the filter pressing device is arranged in the cylinder body; the bottom of the material collecting cavity is provided with a bottom flow port, and an anti-blocking device is arranged at the bottom flow port.
Further, the grading feeding device comprises a circular cylinder and a conical cylinder; the circular cylinder is provided with an air inlet and a waste slurry inlet which feed along the tangential direction of the circular cylinder.
Further, the top end of the round cylinder body is communicated with a feed inlet arranged on the side wall of the concentration device through a pipeline, and a pipeline mixer is also arranged between the top end of the round cylinder body and the feed inlet.
Furthermore, a bottom discharge hole is formed in the bottom of the conical cylinder body, and an ultrasonic anti-blocking device is arranged on the bottom of the conical cylinder body.
Further, a solid content monitor and a flow rate monitor (not shown) are provided at the bottom discharge port.
Furthermore, the solid content monitor adopts an input type ultrasonic concentration meter for monitoring, and concentration detection can provide data basis for judging the concentration effect.
Furthermore, the flow monitor adopts one or more of a differential pressure type flowmeter, a positive displacement flowmeter and an electromagnetic flowmeter for monitoring.
Further, the cylinder of the concentration device comprises a first cylinder and a second cylinder; the diameter of the first cylinder is larger than that of the second cylinder.
Furthermore, an overflow port is formed in the side wall of the second cylinder, and a material collecting cavity is formed in the second cylinder; the lateral wall of the aggregate cavity is provided with a bin wall vibrator.
Further, the bin wall vibrator is an ultrasonic vibrator or a CZ electromagnetic bin wall vibrator.
Further, a filter pressing device is arranged at the top of the first cylinder and comprises filter cloth capable of sliding along the inner wall of the second cylinder; a water collecting cavity is arranged above the filter cloth; a flow equalizing division plate is arranged in the water collection cavity; the water collecting cavity is connected with a hydraulic press arranged on the fixing frame.
Furthermore, a water suction pump is arranged at the top of the first cylinder; the water suction pump is communicated with the water collecting cavity through a connecting pipe.
Further, the anti-blocking device is an anti-blocking device which can relieve blocking through stirring, vibration or high-pressure bubbles.
Furthermore, the inner walls of the grading feeding device and the concentration device are provided with coatings with alkali resistance, corrosion resistance and adhesion prevention.
Further, the water suction pump, the solid content monitor and the flow monitor are all connected with the control system in a conventional electric connection mode.
The invention has the beneficial effects that:
1. the invention has the characteristics of high-efficiency reduction and complete consumption of solid and liquid wastes of a mixing plant, the traditional sedimentation and filter pressing mode treatment can generate a large amount of high-strength filter cakes which cannot be consumed, the treatment is carried out by outward transportation, and the treatment cost is high.
2. The ceramic filter plate used in the invention is combined with the conical bottom structure of the thickener, the internal structures are not affected with each other, under the condition that the solid content cannot be further improved through gravity and chemical sedimentation, the solid content of the lower sedimentation zone is further improved by adopting the principle of vacuum physical suction filtration, meanwhile, the vacuum degree is smaller, the viscosity of waste slurry cannot be obviously improved, and the scraper is also arranged, so that the condition that the waste slurry blocks a lower valve is avoided.
3. The invention has the characteristic of high added value, the micro-nano slurry is obtained by the series treatment of solid waste and liquid waste, the interior of the micro-nano slurry contains a large amount of incompletely hydrated powder materials such as cement, fly ash and the like, and meanwhile, the micro-nano size has good filling effect, can replace part of cementing materials for producing concrete, so that the properties such as strength and the like of the concrete are not reduced, the micro-nano size has good creation effect, the waste is really changed into valuable, and the high added value of the waste is realized.
4. The invention has the characteristic of optimized management, the conventional treatment process is provided with a sedimentation tank, and the conventional treatment process needs to be performed with regular desilting, so that the management and labor cost are increased.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram of a thickener;
FIG. 3 is an electron micrograph of the mixing station waste slurry before and after grinding;
FIG. 4 is the original waste-water particle size distribution;
FIG. 5 is a particle size distribution of the waste slurry after fine grinding;
FIG. 6 is a schematic view of the separation and concentration apparatus;
FIG. 7 is a schematic structural view of the anti-blocking device;
FIG. 8 is a schematic structural view of another anti-blocking device;
fig. 9 is a schematic view of another anti-blocking device.
Wherein, 1, screening machine; 2. a pump machine; 3. a thickener; 301. a third rotating shaft; 302. a feed cavity; 303. a clear water overflow port; 304. a side wall grout outlet; 305. a ceramic filter plate; 306. a vacuum negative pressure device; 307. a bottom valve; 308. a stirring blade; 309. a scraper; 310. a first motor; 311. a first water collection cavity; 312. a underflow port; 313. a first feed port; 314. a staged feeding device; 315. a waste slurry inlet; 316. an anti-blocking device; 317. a discharge pipeline; 318. a second valve; 319. an air intake device; 320. a first rotating shaft; 321. a second motor; 322. a third motor; 323. a second rotating shaft; 324. an air inlet; 325. a pipeline mixer; 326. a second feed port; 327. a first cylinder; 328. a second cylinder; 329. a material collecting cavity; 330. a hydraulic press; 331. a water suction pump; 332. a connecting pipe; 333. a second water collecting cavity; 334. filtering cloth; 335. an overflow port; 336. a first valve; 337. a bin wall vibrator; 338. an ultrasonic anti-blocking device; 339. a flow equalizing partition plate; 4. a clean water tank; 5. a rough grinding machine; 6. a fine grinding machine; 7. a finished product tank; 8. a pipeline valve.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the stirring station waste slurry water sectional type grinding recycling device comprises a sieving machine 1, a pump machine 2, a thickening concentrator 3, a clean water tank 4, a coarse grinding machine 5, a fine grinding machine 6 and a finished product tank 7; the dense thickener 3, the clean water tank 4, the rough mill 5, the fine mill 6 and the finished product tank 7 are communicated by the pump 2. The pump machine 2 is preferably one or more of a screw pump, a slurry pump and a sewage pump, and can convey waste slurry with the maximum particle size of more than 0.6 mm.
The coarse grinding machine 5 and the fine grinding machine 6 are communicated through a pipeline valve 8, at least 4 spherical grinding media are arranged in the coarse grinding machine 5 and the fine grinding machine 6, the size of a middle gap is generally smaller than the size of a feed material of a grinding material when the four spherical grinding media are stacked into a cube, and the calculation is carried out according to a longer direction when the length-diameter ratio of the feed material granularity is inconsistent. The diameter of the spherical grinding medium of the coarse grinding machine 5 is larger than that of the fine grinding machine 6, and the mass density of the spherical grinding medium of the coarse grinding machine 5 is larger than that of the fine grinding machine 6.
The screening machine 1 is of a conventional construction in the art and will not be described in detail herein; which is arranged at the top end of the thickening thickener 3; as shown in fig. 2, the top of the thickener 3 is provided with a first inlet 313, and the top of the thickener 3 is provided with a feeding cavity 302 communicated with the first inlet 313, and slurry entering from the first inlet 313 enters the thickener 3 through the feeding cavity 302.
The top end of one side wall of the thickening thickener 3 is provided with a clear water overflow port 303 communicated with the clear water tank 4, the middle part of the other side of the thickening thickener 3 is provided with a side wall slurry outlet 304 communicated with the fine grinding machine 6, and the bottom part is provided with a bottom flow port 312 communicated with the rough grinding machine 5.
As shown in fig. 2, a first motor 310 is disposed at the top of the exterior of the thickener 3, a third rotating shaft 301 connected to the first motor 310 extends to a bottom flow port 312, a stirring blade 308 is disposed at the end of the third rotating shaft 301, and a feeding chamber 302 for wrapping a part of the third rotating shaft 301 is disposed at the top of the interior of the thickener 3.
As shown in fig. 2, the thickener 3 has a funnel-shaped collecting chamber, and for the disposal efficiency, a ceramic filter device connected to the vacuum negative pressure device 306 is disposed on the collecting chamber; the ceramic filter device comprises a ceramic filter plate 305 and a water collecting cavity 311, wherein the ceramic filter plate 305 is embedded in the side wall of the material collecting cavity, and the surface of the ceramic filter plate can be contacted with waste slurry in the material collecting cavity. The water collecting cavity 311 is connected with the vacuum negative pressure device 306 through a pipeline.
In addition, in order to prevent the waste slurry from blocking the ceramic filter plate 305, a scraper 309 is further arranged on the third rotating shaft 301, the scraper 309 can be attached to and slide on the surface of the ceramic filter plate 305, and the ceramic filter plate 305 cannot be scratched, so that the solid waste adsorbed on the surface of the ceramic filter plate 305 can be scraped through the rotation of the scraper 309, and the operation of the ceramic filter device is facilitated.
The thickener 3 in the present application may be replaced with a structure having the same function, as shown in fig. 6, in which the separation and concentration device includes a classification feed device 314 and a concentration device; wherein, the graded feeding device 314 is composed of an upper circular cylinder and a lower conical cylinder.
As shown in FIG. 6, an air inlet 324 and a waste slurry inlet 315 are formed on the circular cylinder along the tangential direction, the air pressure entering from the air inlet 324 is not less than 12pa, waste slurry is pumped into the circular cylinder from the waste slurry inlet 315 by a pump, and the waste slurry is pumped after the air is introduced from the air inlet 324 to form a rotational flow. From this, air and waste pulp water homoenergetic form the whirl in circular barrel to can realize the classification to the waste pulp water, the upper end contains lower composition promptly and gets into the enrichment facility in by enrichment facility's second feed inlet 326 through the pipeline at circular barrel top and handles, contains higher composition admittedly then carries out subsequent processing through the bottom discharge gate of toper barrel.
As shown in fig. 6, a pipeline mixer 325 is further disposed between the fractional feeding device 314 and the concentration device, and the settling agent and the low solid content component can be mixed by the pipeline mixer 325 and then enter the concentration device together, thereby improving the efficiency of the concentration process.
As shown in FIG. 6, the conical cylinder is provided with a bottom discharge hole and an ultrasonic anti-blocking device 31638, the ultrasonic anti-blocking device 31638 is fixed to the outer wall of the conical cylinder through bolts to prevent the high solid content components from blocking the bottom discharge hole.
As shown in fig. 6, the cylinder of the concentration device is composed of a first cylinder 327 and a second cylinder 328, wherein the first cylinder 327 has a larger diameter than the second cylinder 328. A fixed frame is arranged at the top of the first cylinder 327, a hydraulic press 330 which can extend and retract in the vertical direction is fixed on the fixed frame, and the lower part of the hydraulic press 330 is connected with a filter pressing device. The filter pressing device consists of a second water collecting cavity 333 and a filter cloth 334, wherein the aperture of the filter cloth 334 is 0.5-150 mu m, and is smaller than 20 mu m in the practical application process. A plurality of communicated flow equalizing partition plates 339 are arranged in the second water collecting cavity 333. In addition, a water sucking pump 331 is further disposed at the top of the first cylinder 327, and the water sucking pump 331 is communicated with the second water collecting chamber 333 through a connecting pipe 332.
As shown in fig. 6, a collecting chamber 329 is provided in the second cylinder 328, the collecting chamber 329 is located right below the filter pressing device, and the filter pressing device is attached to the inner wall of the second cylinder 328 and can freely slide, so that the function of filter pressing the waste slurry in the second cylinder 328 is realized.
As shown in FIG. 6, the second cylinder 328 has a second inlet 326 on one side wall communicating with the staged feeding device 314, an overflow 335 on the other side wall, and a first valve 336, preferably a solenoid valve of the first valve 336, disposed at the overflow 335 and electrically connected to the control system.
As shown in fig. 6, a plurality of bin wall vibrators 337 are disposed on an outer wall of the material collecting chamber 329, an anti-blocking device 316 is disposed at a bottom of the bin wall vibrators, the anti-blocking device 316 is a device capable of preventing a bottom flow port from being blocked, and may be of various structures, a preferred structure of the anti-blocking device 316 according to the embodiment of the present invention is shown in fig. 7, and a discharge pipe 317 is connected to an outer portion of the bottom flow port, and includes a vertical portion and a bending portion, both of which are provided with a second valve 318. Meanwhile, an air inlet device 319 is provided at an end of the vertical portion far from the underflow port, and preferably, the air inlet device 319 is a high pressure blower or a pulse stream blower. When the ejection of compact pipeline 317 takes place to block up, can launch high pressure bubble through air inlet unit 319 to alleviate ejection of compact pipeline 317's jam.
Another preferred structure of the anti-blocking device 316 of this embodiment is shown in fig. 8, in which a second motor 321 is disposed at a pipe connected to the underflow port, and a first rotating shaft 320 connected to the second motor 321 is disposed in the pipe, and the first rotating shaft 320 is disposed along a horizontal direction. The first shaft 320 is provided with stirring blades having opposite spiral directions, and the pipe is provided with a second valve 318 located below the anti-clogging device 316. Drive first pivot 320 through second motor 321 and rotate, can effectually alleviate the jam, simultaneously, the stirring vane that the spiral opposite direction that sets up on the first pivot 320 also can avoid first pivot 320 to rotate the jam that probably leads to when stirring along same direction.
Another preferred structure of the anti-blocking device 316 in this embodiment is shown in fig. 9, a third motor 322 is disposed on an outer wall of a pipe connected to the underflow port, the third motor 322 is disposed in a vertical direction and faces the underflow port, a second rotating shaft 323 disposed in the pipe and connected to the third motor 322 also faces the underflow port and is disposed in the vertical direction, a stirring blade is disposed on the second rotating shaft 308, and then a second valve 318 for controlling discharging is also disposed on the pipe.
In this embodiment, the first valve 336 and the second valve 318 are both electrically connected to the control system, which is preferably a solenoid valve.
Example 1
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding polyaluminum ferric chloride which accounts for 0.01 percent of the mass of the solid in the first-stage waste slurry into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.01MPa for 60min, carrying out thickening classification, and respectively collecting the second-stage waste slurry flowing out of a slurry outlet on the side wall of the thickening concentrator after classification and the third-stage waste slurry flowing out of the bottom of the thickening concentrator;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste slurry, the particles obtained in the step S3 and the polycarboxylic acid water reducing agent into a coarse grinding machine for coarse grinding for 30min to obtain five sections of waste slurry; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.5 cm; the adding amount of the polycarboxylic acid water reducing agent is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 20min to obtain micro-nano-grade slurry; wherein the spherical grinding media in the fine mill is zirconia having a diameter of 1.2 cm.
Example 2
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding polymeric ferric sulfate which accounts for 0.01 percent of the mass of the solid in the first-stage waste slurry into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.02MPa for 60min, carrying out thickening classification, and respectively collecting the second-stage waste slurry flowing out of a slurry outlet on the side wall of the thickening concentrator after classification and the third-stage waste slurry flowing out of the bottom of the thickening concentrator;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste slurry, the particles obtained in the step S3 and the polycarboxylic acid water reducing agent into a coarse grinding machine for coarse grinding for 30min to obtain five sections of waste slurry; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.5 cm; the adding amount of the polycarboxylic acid water reducing agent is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 20min to obtain micro-nano-grade slurry; wherein the spherical grinding media in the fine mill is zirconia having a diameter of 1.2 cm.
Example 3
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding polyaluminium sulfate which accounts for 0.01 percent of the mass of the solid in the first-stage waste slurry into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.03MPa for 60min, carrying out thickening classification, and respectively collecting second-stage waste slurry flowing out of a slurry outlet on the side wall of a thickening concentrator after classification and third-stage waste slurry flowing out of the bottom of the thickening concentrator;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste slurry, the particles obtained in the step S3 and the polycarboxylic acid water reducing agent into a coarse grinding machine for coarse grinding for 30min to obtain five sections of waste slurry; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.5 cm; the adding amount of the polycarboxylic acid water reducing agent is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 20min to obtain micro-nano-grade slurry; wherein the spherical grinding media in the fine mill is zirconia having a diameter of 1.2 cm.
Example 4
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding polyacrylamide accounting for 0.01 percent of the mass of the solid in the first-stage waste slurry into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.04MPa for 60min, carrying out thickening classification, and respectively collecting second-stage waste slurry flowing out of a slurry outlet on the side wall of a thickening concentrator after classification and third-stage waste slurry flowing out of the bottom of the thickening concentrator;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste pulp, the particles obtained in the step S3 and the polyol into a coarse grinding machine for coarse grinding for 60min to obtain five sections of waste pulp; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.5 cm; the adding amount of the polyalcohol is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 20min to obtain micro-nano-grade slurry; wherein, the spherical grinding medium in the fine grinding machine is silicon carbide with the diameter of 1.2 cm.
Example 5
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding polysilicate which accounts for 0.02% of the mass of the solid in the first-stage waste slurry into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.05MPa for 60min, carrying out thickening classification, and respectively collecting the second-stage waste slurry flowing out of a slurry outlet on the side wall of the thickening concentrator after classification and the third-stage waste slurry flowing out of the bottom of the thickening concentrator;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste pulp, the particles obtained in the step S3 and the polyol into a coarse grinding machine for coarse grinding for 60min to obtain five sections of waste pulp; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.5 cm; the adding amount of the polyalcohol is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 20min to obtain micro-nano-grade slurry; wherein, the spherical grinding medium in the fine grinding machine is silicon carbide with the diameter of 1.2 cm.
Example 6
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding a settling agent which is 0.01 percent of the solid mass in the first-stage waste pulp into the first-stage waste pulp obtained in the step S1, wherein the settling agent consists of polyaluminum ferric chloride and polysilicate in a ratio of 1: 1; then placing the slurry in an environment of 0.01MPa for 70min, carrying out thickening classification, and respectively collecting two-section waste slurry flowing out from a slurry outlet on the side wall of the thickening thickener and three-section waste slurry flowing out from the bottom after classification;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste pulp, the particles obtained in the step S3 and the polyol into a coarse grinding machine for coarse grinding for 60min to obtain five sections of waste pulp; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.2 cm; the adding amount of the polyalcohol is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 30min to prepare micro-nano-scale slurry; wherein, the spherical grinding medium in the fine grinding machine is silicon carbide with the diameter of 1.0 cm.
Example 7
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding a settling agent which is 0.01 percent of the solid mass in the first-stage waste pulp into the first-stage waste pulp obtained in the step S1, wherein the settling agent consists of polyaluminum ferric chloride and polysilicate in a ratio of 1: 1; then placing the slurry in an environment of 0.01MPa for 80min, carrying out thickening classification, and respectively collecting two-section waste slurry flowing out from a slurry outlet on the side wall of the thickening thickener and three-section waste slurry flowing out from the bottom after classification;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste pulp, the particles obtained in the step S3 and the polyalcohol amine into a coarse grinding machine for coarse grinding for 90min to obtain five sections of waste pulp; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.2 cm; the adding amount of the polyalcohol amine is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 30min to prepare micro-nano-scale slurry; wherein, the spherical grinding medium in the fine grinding machine is silicon carbide with the diameter of 1.0 cm.
Example 8
A stirring station waste slurry water sectional type grinding recycling process comprises the following steps:
s1, screening
Treating the waste slurry by a screening machine, and separating particles with the particle size of more than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding a settling agent which is 0.01 percent of the solid mass in the first-stage waste pulp into the first-stage waste pulp obtained in the step S1, wherein the settling agent consists of polyaluminum ferric chloride and polysilicate in a ratio of 1: 1; then placing the slurry in an environment of 0.01MPa for 90min, carrying out thickening classification, and respectively collecting two-section waste slurry flowing out from a slurry outlet on the side wall of the thickening thickener and three-section waste slurry flowing out from the bottom after classification;
s3, crushing and screening
Crushing the solid waste of the stirring station to a particle size of less than 25mm, and collecting particles with the particle size of less than 0.6 mm; the material with the grain diameter larger than 0.6mm is recycled as aggregate for producing concrete;
s4, coarse grinding
Placing the three sections of waste pulp, the particles obtained in the step S3 and the polyalcohol amine into a coarse grinding machine for coarse grinding for 90min to obtain five sections of waste pulp; the spherical grinding medium in the rough grinding machine is zirconia, and the diameter of the spherical grinding medium is 1.2 cm; the adding amount of the polyalcohol amine is 0.01 percent of the mass of the solid in the three-stage waste slurry;
s5. fine grinding
Mixing the two-stage waste slurry and the five-stage waste slurry, and then placing the mixture into a fine grinding machine for fine grinding for 30min to prepare micro-nano-scale slurry; wherein, the spherical grinding medium in the fine grinding machine is silicon carbide with the diameter of 1.0 cm.
Examples of the experiments
1. The concentration effect of each of examples 1 to 8 was examined, and the results are shown in Table 1.
TABLE 1 concentration Effect
| Scheme(s) | Concentration of bottom solids | Solid content of overflow liquid | The proportion of the released clear water in the original waste pulp |
| Example 1 | 24％ | Clean water | 56％ |
| Example 2 | 25％ | Clean water | 59％ |
| Example 3 | 24％ | Clean water | 58％ |
| Example 4 | 23％ | Clean water | 62％ |
| Example 5 | 24％ | Clean water | 63％ |
| Example 6 | 28％ | Clean water | 73％ |
| Example 7 | 31％ | Clean water | 81％ |
| Example 8 | 33％ | Clean water | 85％ |
According to the data of the examples 1 to 5 in the data of the table 1, the concentration effect of different settling agents on the waste slurry is different, wherein the solid content effect of aluminum polysilicate and polyacrylamide on the waste slurry is better. The data of examples 5-8 show that increasing the residence time of the waste slurry in the thickener is beneficial to increasing the solid content of the waste slurry.
2. The grinding effects of examples 1 to 8 were measured, and the results of using the mill waster water which was not directly ground by the concentration process as a control group are shown in Table 2.
TABLE 2 grinding effect
| Scheme(s) | D50/μm |
| Comparison group | 200.0 |
| Example 1 | 10.2 |
| Example 2 | 10.0 |
| Example 3 | 9.9 |
| Example 4 | 7.6 |
| Example 5 | 6.2 |
| Example 6 | 7.0 |
| Example 7 | 4.2 |
| Example 8 | 3.1 |
As can be seen from the data of the examples 1 to 8 in the table 2, after two-stage grinding after concentration, the refining effect of the waste slurry is obviously improved, the grinding media with better wear resistance are used in the examples 2 and 3, which is beneficial to further refining the fineness of the waste slurry, and the data of the examples 3 to 8 show that the improvement of the grinding time is beneficial to refining the fineness of solid particles in the waste slurry, the energy consumption is considered, and the grinding time is preferably controlled within 60 minutes.
3. The micro-nano-scale slurry prepared in the examples 1 and 8 of the present application was used to prepare C60 concrete, and the compressive strength of the concrete was measured for 7 days and 28 days using C60 concrete without adding ground waste slurry as a control, and the results are shown in Table 3.
TABLE 3C60 concrete compressive Strength
As can be seen from the data in Table 3, compared with the blank group, the strength performance of the C60 concrete prepared by using the refined slurry obtained by two-stage grinding after concentration instead of the rubber material is not reduced.
4. C60 concrete was prepared using the micro-nano-sized slurry prepared in examples 1 and 8 of the present application, and C60 concrete without adding ground waste slurry was used as a control, and then additional value calculations were performed, respectively, and the results are shown in table 4.
TABLE 4C60 concrete addition value calculation
As can be seen from the data of the example 1 and the example 8 in the table 4, the concrete prepared by using the refined slurry to replace the rubber material has good additional value, and the replacement amount is 20-50 kg/m3The cost of each concrete is saved by 4-25 yuan.
Claims (10)
1. The sectional type grinding and recycling process for the waste slurry in the mixing plant is characterized by comprising the following steps of:
s1, screening
Separating particles with the particle size larger than 0.6mm in the waste slurry water of the stirring station to obtain a section of waste slurry;
s2, concentration classification
Adding a settling agent into the first-stage waste slurry obtained in the step S1, then placing the first-stage waste slurry in an environment of 0.01-0.05 MPa for 60-90 min, carrying out dense classification, and collecting the second-stage waste slurry flowing out of the middle-lower part and the third-stage waste slurry flowing out of the bottom after classification;
s3, crushing and screening
Crushing solid waste in a stirring station and collecting particles with the particle size of less than 0.6 mm;
s4, coarse grinding
Coarsely grinding the three-section waste pulp and the particles obtained in the step S3 for not less than 30min to obtain five-section waste pulp;
s5. fine grinding
And mixing the two-stage waste slurry and the five-stage waste slurry, and finely grinding for 10-30 min.
2. The mixing plant waste slurry water-stage grinding recycling process of claim 1, wherein an overflow clear liquid with a solid mass concentration of less than 0.1% is generated in the thickening and classifying process.
3. The mixing plant waste slurry water-staged grinding recycling process of claim 1, wherein the solid mass concentration of the three-stage waste slurry is not less than 20%.
4. The mixing plant waste slurry water-stage grinding recycling process of claim 1, wherein the addition amount of the settling agent is 0.01-0.1% of the mass of the solid in the waste slurry.
5. The mixing plant waste slurry water-staged grinding recycling process of claim 1 or 4, wherein the settling agent is at least one of polyaluminum ferric chloride, polyferric sulfate, polyaluminum sulfate, polysilicate and polyacrylamide.
6. The mixing station waste slurry water-stage grinding recycling process as claimed in claim 1, wherein grinding aids are added in the coarse grinding process and the fine grinding process; the dosage of the grinding aid in the coarse grinding process is 0.01-0.2% of the mass of solids in the three-stage waste pulp; the dosage of the grinding aid in the fine grinding process is 0.01-0.2% of the total solid mass in the two-stage waste slurry and the five-stage waste slurry.
7. A stirring station waste slurry water sectional type grinding recycling device is characterized by comprising a screening machine, a separation and concentration structure, a coarse grinding machine, a fine grinding machine and a finished product tank; the thickening thickener is respectively communicated with the sieving machine, the coarse grinding machine and the fine grinding machine; the fine grinding machine is respectively communicated with the coarse grinding machine and the finished product tank;
the separation and concentration structure is a thickener or a separation and concentration device.
8. The stirring station waste slurry water-segmented grinding and recycling device of claim 7, wherein the top of the thickener is provided with a first feeding hole, and the inner top of the thickener is provided with a feeding cavity communicated with the feeding hole; a funnel-shaped material collecting cavity is arranged below the material inlet cavity; the bottom of the material collecting cavity is provided with a bottom flow port; the top of the thickener is provided with a third rotating shaft extending to the underflow opening; and one end of the third rotating shaft close to the underflow port is provided with a stirring blade.
9. The staged milling and recycling device for mixing plant waste slurry according to claim 8, wherein a scraper is further disposed on the rotating shaft; the scraper and the ceramic filter plate can be jointed and slide.
10. The mixing plant waste slurry water stage type grinding recycling device of claim 7, characterized in that the separation and concentration device comprises a stage feeding device and a concentration device which are communicated with each other; the grading feeding device is provided with an air inlet and a waste slurry inlet; gas and waste slurry entering the air inlet and the waste slurry inlet can form rotational flow in the grading feeding device; the concentration device comprises a cylinder body; a filter pressing device is arranged at the top of the cylinder body, and a material collecting cavity positioned below the filter pressing device is arranged in the cylinder body; and a underflow port is formed at the bottom of the material collecting cavity, and an anti-blocking device is arranged at the underflow port.
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