阅读说明：本技术 一种采用工业废渣制备水泥缓凝剂的装置及方法 (Device and method for preparing cement retarder by adopting industrial waste residues ) 是由 雍毅 吴怡 尹朝阳 薛嘉 郭卫广 刘恒博 黄祥 于 2021-02-20 设计创作，主要内容包括：本发明公开了一种采用工业废渣制备水泥缓凝剂的装置及方法,其中装置包括依次布置的清洗装置、离心装置、改性装置以及成型装置,改性装置为搅拌池,搅拌池由隔板分为上搅拌池和下搅拌池,上搅拌池和下搅拌池均设置有搅拌器和与搅拌器电性连接的控制器,上搅拌池上端设置有若干进料端口、计量称与电磁阀门一,下搅拌池设置有出料端口、pH检测装置与电磁阀门二,上搅拌池上方设置有倒漏斗形圆盘。通过本装置对工业废渣进行脱水和改性,可以将磷石膏制备成性能优异的水泥缓凝剂,并且在消纳了电石渣、工业碱渣和粉煤灰等工业固废的同时,还降低生产成本,带来一定的经济效益。(The invention discloses a device and a method for preparing cement retarder by using industrial waste residues, wherein the device comprises a cleaning device, a centrifugal device, a modification device and a forming device which are sequentially arranged, the modification device is a stirring tank, the stirring tank is divided into an upper stirring tank and a lower stirring tank by a partition plate, the upper stirring tank and the lower stirring tank are respectively provided with a stirrer and a controller electrically connected with the stirrer, the upper end of the upper stirring tank is provided with a plurality of feeding ports, a metering scale and a first electromagnetic valve, the lower stirring tank is provided with a discharging port, a pH detection device and a second electromagnetic valve, and an inverted funnel-shaped disc is arranged above the upper stirring tank. The device can dehydrate and modify industrial waste residues, can prepare phosphogypsum into a cement retarder with excellent performance, and reduces the production cost while consuming industrial solid wastes such as carbide slag, industrial alkaline slag, fly ash and the like, thereby bringing certain economic benefit.)

1. The utility model provides an adopt device of industrial waste residue preparation cement retarder, its characterized in that, including belt cleaning device, centrifugal device, modification device and the forming device who arranges in proper order, modification device is the stirring pond, the stirring pond is divided into by the baffle and stirs pond (6) and lower stirring pond (7), go up stirring pond (6) and lower stirring pond (7) all be provided with agitator (10) and with agitator (10) electric connection's controller, it is provided with a plurality of feed port (9), weigher and solenoid valve one (14) to go up stirring pond (6) upper end, stirring pond (7) are provided with discharge port (13), pH detection device and solenoid valve two (12) down, it is provided with inverted funnel shape disc (8) to go up stirring pond (6) top.

2. The apparatus for preparing cement retarder from industrial waste residue according to claim 1, wherein the cleaning apparatus comprises a ladder pool (5), the ladder pool (5) is provided with a plurality of water inlet pipes (2) at the upper edge, a water outlet pipe at the lower end, a gauze net (4) at the bottom, a hauling rope (3) at the edge of the gauze net (4), and the hauling rope (3) is movably connected with the mechanical arm (1).

3. The apparatus for preparing cement retarder from industrial slag according to claim 1, wherein the centrifuge is a punching bag centrifuge and the forming apparatus is a disc pelletizer.

4. The apparatus for preparing cement retarder from industrial slag according to claim 1, wherein the pH detection device comprises a pH automatic detector, a display and a display lamp, all of which are electrically connected with the controller.

5. The apparatus for preparing cement retarder using industrial slag according to claim 1, wherein the disc (8) is provided with rotating contraction teeth having a triangular shape.

6. The apparatus for preparing cement retarder from industrial waste residue according to claim 1, wherein the partition plate is provided therein with a feed delivery pipe (11) and a third electromagnetic valve, and the third electromagnetic valve is electrically connected to the controller.

7. The method for preparing the cement retarder by using the device for preparing the cement retarder from the industrial waste residue as claimed in any one of claims 1 to 6 is characterized by comprising the following steps:

(1) circularly cleaning fresh phosphogypsum in a cleaning device for 3-5 times, wherein the liquid-solid ratio is 3: 1-6: 1;

(2) taking out the cleaned phosphogypsum, and centrifugally dewatering or aging for 2-4 months in a centrifugal device to obtain dewatered phosphogypsum;

(3) storing the dehydrated phosphogypsum into a disc (8), and mixing industrial carbide slag, alkaline slag and fly ash according to a mass ratio of 50-70: 20-30: 5-15 are input into an upper stirring pool (6) from a feed port (9) and are stirred with the dehydrated phosphogypsum for the first time;

(4) opening a material conveying pipe (11), inputting the mixture obtained in the step (3) into a lower stirring pool (7), piling for 1-5 days, adjusting the pH value to be more than 7, and carrying out secondary stirring;

(5) and (4) preparing the obtained substance after the secondary stirring into the cement retarder with fixed particles by a disc granulator.

8. The method for preparing the cement retarder according to claim 7, wherein the mixture of the industrial carbide slag, the alkali slag and the fly ash accounts for 1-5% of the mass fraction of the phosphogypsum.

9. The method for preparing the cement retarder according to claim 7, wherein the rotational speed of the centrifugal dehydration is 800-2000 r/min, and the dehydration time is 10-20 min.

Technical Field

The invention relates to the technical field of cement retarders, in particular to a device and a method for preparing a cement retarder by using industrial waste residues.

Background

Phosphogypsum cannot be directly used as a retarder for cement. Firstly, the phosphogypsum contains a large amount of water-soluble phosphorus pentoxide, water-soluble fluorine, organic matters and other harmful impurities, so that the phosphogypsum is acidic and corrosive to a certain extent, and C can be delayed₃A and C₃S and other cement minerals have early hydration speed, so that the setting time of the cement is prolonged, and the early strength is reduced. Secondly, the phosphogypsum is wet powder, the attached water content is 15-30 percent and is unstable, which is not beneficial to transportation and measurement, and the blockage and agglomeration of a silo, paste grinding in a cement mill and the like are easily caused.

The caustic soda industry in China has huge capacity, and about 13.6kg of caustic sludge (containing 35.9 percent of water) is generated when 1t of finished caustic soda is produced. The alkaline residue mainly contains industrial residue containing calcium salts such as calcium carbonate, calcium sulfate, silicon dioxide, calcium chloride, etc., and also contains small amount of magnesium hydroxide, calcium hydroxide, iron aluminum oxide, and sodium chloride. The alkaline residue is alkaline, and the pH value is about 10. Most enterprises aim at the situation that salt mud is almost piled up or buried after being subjected to filter pressing, and the treatment method is high in cost and inevitably affects the environment. The cost for waste residue discharge of a factory producing 80 ten thousand of soda ash every year is about 1000 ten thousand yuan. Therefore, the alkaline residue is effectively utilized, waste is changed into valuable, and the method has obvious social benefit and economic benefit and broad prospect.

The fly ash is the main solid waste discharged by coal-fired power plants and coal gangue and coal slime comprehensive utilization power plants. The pH value of the fly ash is 8-11. The fly ash mainly comprises silicon dioxide and aluminum oxide (the content of silicon oxide is about 48 percent, the content of aluminum oxide is about 27 percent) as chemical components, and comprises ferric oxide, calcium oxide, magnesium oxide, potassium oxide, sodium oxide, sulfur trioxide and unburned organic matters as other components.

The method for preparing the cement retarder by the phosphogypsum in the prior art comprises the following steps: mixing phosphogypsum, slag powder or fly ash and quicklime powder or carbide slag powder, adding an alkali catalyst, mixing and balling to obtain the calcium-lime-fly-ash ball, wherein the requirements of the raw material quicklime powder are that the CaO content is more than or equal to 65% and the 90-mum screen residue is less than or equal to 7%, the requirements of the fly ash are that the grade II fly ash is used, the requirement of the slag powder is that the grade S75 slag powder is used, and the requirements of the carbide slag powder are that the CaO content of free. The raw materials are screened to a certain degree, and the centralized finishing and conversion of the industrial waste residue cannot be carried out.

Disclosure of Invention

The invention aims to provide a device and a method for preparing a cement retarder by using industrial waste residues, the device and the method can be used for uniformly mixing the industrial waste residues to prepare the cement retarder, economic benefits are brought under the condition of eliminating industrial solid wastes, and the device is simple in structure and convenient to operate.

In order to achieve the purpose, the invention provides a device for preparing cement retarder by using industrial waste residues, which comprises a cleaning device, a centrifugal device, a modification device and a forming device which are sequentially arranged, wherein the modification device is a stirring tank, the stirring tank is divided into an upper stirring tank and a lower stirring tank by a partition plate, the upper stirring tank and the lower stirring tank are respectively provided with a stirrer and a controller electrically connected with the stirrer, the upper end of the upper stirring tank is provided with a plurality of feeding ports, a metering scale and a first electromagnetic valve, the lower stirring tank is provided with a discharging port, a pH detection device and a second electromagnetic valve, and an inverted funnel-shaped disc is arranged above the upper stirring tank.

The beneficial effect who adopts above-mentioned scheme is: removing soluble phosphorus, fluorine, organic matters and other impurities in most of fresh phosphogypsum by a cleaning device, removing water poured during cleaning by a centrifugal device, placing the phosphogypsum in a disc, stirring the mixture by a stirrer after industrial carbide slag, alkali slag and fly ash enter an upper stirring tank from a feeding port to form a modifier, pouring the phosphogypsum into the upper stirring tank from the disc, mixing by the stirrer to modify acidic phosphogypsum, metering raw materials entering the upper stirring tank by a metering scale, and controlling the adding amount by opening the feeding port through an electromagnetic valve I; and (3) the uniformly mixed mixture enters a lower stirring tank from a partition plate, stands and ages in the lower stirring tank, and can be adjusted to meet the construction requirements by adding industrial carbide slag according to the pH value detected by a pH detection device. Finally, preparing the mixture into spherulites with uniform particle sizes through a forming device, and using the spherulites for cement condensation; wherein the controller can be an ohm dragon CP1H-X40DT-D PLC controller.

Further, belt cleaning device includes the ladder pond, and ladder pond upper portion edge is provided with a plurality of inlet channels, and the lower extreme is provided with outlet conduit, and the bottom is provided with the gauze net, and gauze net edge is provided with the haulage rope, haulage rope and arm swing joint.

The beneficial effect who adopts above-mentioned scheme is: the method is characterized in that fresh phosphogypsum is put into a cleaning device, a plurality of water inlet pipelines are flushed with water simultaneously, a large impact force can be exerted on impurities of the phosphogypsum, a stepped pool can have a staged cleaning effect on the phosphogypsum, and finally, a gauze net is pulled by a mechanical arm so that the cleaned phosphogypsum can be collected.

Further, the centrifugal device is a punching bag centrifuge, and the forming device is a disk pelletizer.

The beneficial effect who adopts above-mentioned scheme is: the punching bag centrifuge can be a PSD type centrifuge, and the disc balling machine can be PQ (T) -500; the motor of the punching bag centrifuge drives the rotary drum to rotate, materials are added into the rotary drum through the top feeding pipe and tend to the rotary drum under the action of centrifugal force, and liquid phase penetrates through the filter cloth and the filter holes of the drum wall to be discharged. The solid phase is trapped in the rotary drum, the machine cover is opened after the machine is stopped to release the locking pin of the liquid blocking plate, the liquid blocking plate and the filter bag filled with filter residue are lifted to the discharging position by a lifting device, the special lifting claw is released to open one end of the filter bag, and the filter cake automatically falls down. The raw material powder is made into the uniform-granularity ball core in the disk balling machine, then the ball core is fed into the balling disk, the ball core is acted by centrifugal force, friction force and gravity in the disk after entering the balling disk, the ball core moves along the parabola, and the moisture in the ball is continuously extruded out of the surface in the continuous rolling process, and the ball core and the raw material powder are mutually bonded and grow gradually in the moving process due to the caking property and plasticity of the materials. The material ball has certain strength due to the caking property of the material and the natural volatilization of the surface liquid film. When the parameters of the ball forming disc, such as the inclination angle, the disc edge height, the rotating speed, the moisture and the like are fixed, the material balls with different grain diameters leave the disc edge to roll downwards according to different departure angles due to different gravity, and then are discharged out of the disc from the edge part of the disc along with the rotation of the inclined disc body.

Further, the pH detection device comprises a pH automatic detector, a display and a display lamp which are electrically connected with the controller.

The beneficial effect who adopts above-mentioned scheme is: the model of the pH automatic detector can be an SIN-pH6.3 model, the pH value of the mixture is detected through the pH automatic detector, the pH value is displayed on the display, if the pH value does not reach 7, the display lamp cannot be turned on, new industrial carbide slag needs to be continuously added for alkalinity adjustment, and after the alkalinity is higher than 7, the controller controls the display lamp to be turned on to prompt a worker that the alkalinity does not need to be continuously adjusted.

Further, the disc is provided with rotary contracting teeth, and the shape of the rotary contracting teeth is triangular.

The beneficial effect who adopts above-mentioned scheme is: the phosphogypsum on the disc can be uniformly scattered into the upper stirring pool by rotating the contraction teeth to be continuously mixed with the mixture.

Furthermore, a material conveying pipe and a third electromagnetic valve are arranged in the partition plate, and the third electromagnetic valve is electrically connected with the controller.

The method for preparing the cement retarder by adopting the device for preparing the cement retarder from the industrial waste residues comprises the following steps:

(1) circularly cleaning fresh phosphogypsum in a cleaning device for 3-5 times, wherein the liquid-solid ratio is 3: 1-6: 1;

(2) taking out the cleaned phosphogypsum, and centrifugally dewatering or aging for 2-4 months in a centrifugal device to obtain dewatered phosphogypsum;

(3) storing the dehydrated phosphogypsum into a disc, and mixing industrial carbide slag, alkaline residue and fly ash according to a mass ratio of 50-70: 20-30: 5-15, inputting the mixture into an upper stirring pool from a feeding port, and stirring the mixture and the dehydrated phosphogypsum for the first time;

(4) opening a material conveying pipe, inputting the mixture obtained in the step (3) into a lower stirring pool, stacking for 1-5 days, adjusting the pH value to be more than 7, and carrying out secondary stirring;

(5) and (4) preparing the obtained substance after the secondary stirring into the cement retarder with fixed particles by a disc granulator.

The beneficial effect who adopts above-mentioned scheme is: firstly, cleaning fresh phosphogypsum to remove most of dissolved phosphorus, fluorine and organic matters, so as to prevent the dissolved phosphorus, fluorine and organic matters from prolonging the delayed coagulation time of cement and reducing the strength of the cement; secondly, centrifugal dehydration or aging is carried out, so that the water content of the phosphogypsum with high water content after cleaning can be reduced to be within 15%; the mixture of the industrial carbide slag, the alkaline residue and the fly ash can be used as a modifier, the phosphogypsum contains free acid, and the pH values of the carbide slag, the alkaline residue and the fly ash are alkaline, so that the free acid in the phosphogypsum can be neutralized, the leaching of soluble phosphorus and fluorine in the phosphogypsum can be reduced, the influence of the soluble phosphorus and fluorine on a retarder can be reduced, the product quality can be improved, the pH value is finally adjusted to be higher than 7, and the requirement of construction requirements on cement setting time can be met. And the cement retarder can be prepared into 10-30mm spherulites through a disc granulator, so that the construction is convenient.

Further, the mixture of the industrial carbide slag, the alkaline residue and the fly ash accounts for 1-5% of the phosphogypsum by mass percent.

Furthermore, the rotation speed of centrifugal dehydration is 800-2000 r/min, and the dehydration time is 10-20 min.

In summary, the invention has the following advantages:

1. the phosphogypsum is modified by the carbide slag, so that the obtained phosphogypsum has good performance, is used for a cement retarder, not only can achieve the effect of retarding natural gypsum, but also can increase the strength of cement, and can prolong the service life of the cement; the phosphogypsum is modified by the carbide slag, because the carbide slag and the phosphogypsum are large industrial waste residues, the raw material source is rich, the cost is low, and the carbide slag modification can obtain good modification effect only by reacting for 2 hours at normal temperature by the preparation method of the invention; the carbide slag modified phosphogypsum has the advantages of low cost, simple process condition, rich raw material sources and the like;

2. the modified phosphogypsum can be completely used as a coagulation regulator of cement, and simultaneously consumes industrial solid wastes such as carbide slag, industrial alkaline residue, fly ash and the like, so that the production process is simple, the production cost is reduced, the ecological environment is protected, and certain economic benefit is brought.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic view of the cleaning apparatus;

FIG. 3 is a schematic structural view of a stirring tank;

FIG. 4 is a schematic structural view of a disk;

wherein, 1, a mechanical arm; 2. a water inlet pipe; 3. a hauling rope; 4. a gauze mesh; 5. a step pool; 6. feeding the mixture into a stirring pool; 7. a lower stirring tank; 8. a disc; 9. a feed port; 10. a stirrer; 11. a delivery pipe; 12. a second electromagnetic valve; 13. a discharge port; 14. and a first electromagnetic valve.

Detailed Description

The invention provides a device for preparing cement retarder by using industrial waste residues, which comprises a cleaning device, a centrifugal device, a modification device and a forming device which are sequentially arranged, wherein the modification device is a stirring tank which is divided into an upper stirring tank 6 and a lower stirring tank 7 by a partition plate, the upper stirring tank 6 and the lower stirring tank 7 are respectively provided with a stirrer 10 and a controller electrically connected with the stirrer 10, the upper end of the upper stirring tank 6 is provided with a plurality of feeding ports 9, a metering scale and an electromagnetic valve I14, the lower stirring tank 7 is provided with a discharging port 13, a pH detection device and an electromagnetic valve II 12, and an inverted funnel-shaped disc 8 is arranged above the upper stirring tank 6.

Wherein, belt cleaning device includes ladder pond 5, and 5 upper portion edges in ladder pond are provided with a plurality of inlet channels 2, and the lower extreme is provided with outlet conduit, and the bottom is provided with gauze net 4, and gauze net 4 edges are provided with haulage rope 3, haulage rope 3 and arm 1 swing joint.

Wherein, the centrifugal device is a punching bag centrifuge, and the forming device is a disk balling machine.

Wherein, pH detection device includes pH automated inspection appearance, display and the display lamp all with controller electric connection.

Wherein, the disc 8 is provided with rotary contraction teeth, and the shape of the rotary contraction teeth is triangular.

Wherein, a material conveying pipe 11 and a third electromagnetic valve are arranged in the clapboard, and the third electromagnetic valve is electrically connected with the controller.

Example 1

The method for preparing the cement retarder by adopting the device for preparing the cement retarder from the industrial waste residues comprises the following steps:

(1) cleaning of

Firstly, cleaning fresh phosphogypsum in a cleaning device, and cleaning and filtering for 5 times by adopting circulating water in a factory according to a liquid-solid ratio of 4:1 to remove most of dissolved phosphorus, fluorine and organic matters;

(2) centrifugation

Taking out the cleaned phosphogypsum by using the mechanical arm 1, and then carrying out medium-high speed centrifugal dehydration, wherein the rotating speed of a centrifugal machine is 1000r/min, the centrifugal time is 20min, the water content of the phosphogypsum is reduced to be within 12%, and the removed percolate enters a percolate collecting pool and is simply treated as part of production reuse water in a field;

(3) one-time stirring

Industrial carbide slag, alkaline residue and fly ash are mixed according to the mass ratio of 70: 20: 10, conveying the mixture from a feeding port 9 to an upper stirring tank 6 for mixing and stirring to prepare an alkaline modifier, adding the modifier accounting for 3% of the mass of the phosphogypsum into the cleaned and dehydrated phosphogypsum, stirring and uniformly mixing for the first time, inputting the mixture into a lower stirring tank 7, and stacking and reacting for 5 days;

(4) second stirring

Testing the pH value of the modified phosphogypsum subjected to stockpiling reaction by using a pH automatic detector, adding industrial carbide slag for the second time according to the pH value, adjusting the pH value to be more than 7, and stirring for the second time to obtain a cement retarder;

(5) is made into

And (4) preparing the obtained substance after the secondary stirring into the cement retarder with fixed particles by a disc granulator.

Example 2

The method for preparing the cement retarder by adopting the device for preparing the cement retarder from the industrial waste residues comprises the following steps:

(1) cleaning of

Firstly, cleaning fresh phosphogypsum in a cleaning device, and cleaning and filtering for 3 times by using circulating water in a factory according to a liquid-solid ratio of 6:1 to remove most of dissolved phosphorus, fluorine and organic matters;

(2) aging of the mixture

Taking out the cleaned phosphogypsum by using the mechanical arm 1, aging for 4 months to reduce the water content of the phosphogypsum to be within 15 percent, and allowing the removed percolate to enter a percolate collecting tank to be simply treated as part of production reuse water in a field;

(3) one-time stirring

Mixing industrial carbide slag, alkaline residue and fly ash according to a mass ratio of 60: 25: 15, conveying the mixture from a feeding port 9 to an upper stirring pool 6 for mixing and stirring to prepare an alkaline modifier, adding the modifier accounting for 4% of the mass of the phosphogypsum into the cleaned and dehydrated phosphogypsum for primary stirring and uniform mixing, inputting the mixture into a lower stirring pool 7, and stacking and reacting for 5 days;

(4) second stirring

Testing the pH value of the modified phosphogypsum subjected to stockpiling reaction by using a pH automatic detector, adding industrial carbide slag for the second time according to the pH value, adjusting the pH value to be more than 7, and stirring for the second time to obtain the cement retarder.

(5) Is made into

And (4) preparing the obtained substance after the secondary stirring into the cement retarder with fixed particles by a disc granulator.

Example 3

The method for preparing the cement retarder by adopting the device for preparing the cement retarder from the industrial waste residues comprises the following steps:

(1) cleaning of

Firstly, cleaning fresh phosphogypsum in a cleaning device, and cleaning and filtering for 4 times by adopting circulating water in a factory according to a liquid-solid ratio of 6:1 to remove most of dissolved phosphorus, fluorine and organic matters;

(2) centrifugation

Taking out the cleaned phosphogypsum by using the mechanical arm 1, and then carrying out medium-high speed centrifugal dehydration, wherein the rotating speed of a centrifugal machine is 2000r/min, the centrifugal time is 10min, the water content of the phosphogypsum is reduced to be within 10%, and the removed percolate enters a percolate collecting pool and is simply treated as part of production reuse water in a field;

(3) one-time stirring

Industrial carbide slag, alkaline residue and fly ash are mixed according to the mass ratio of 70: 25: 5, conveying the mixture from a feeding port 9 to an upper stirring tank 6 for mixing and stirring to prepare an alkaline modifier, adding the modifier accounting for 1% of the mass of the phosphogypsum into the cleaned and dehydrated phosphogypsum, stirring and uniformly mixing for the first time, inputting the mixture into a lower stirring tank 7, and stacking and reacting for 5 days;

(4) second stirring

Testing the pH value of the modified phosphogypsum subjected to stockpiling reaction by using a pH automatic detector, adding industrial carbide slag for the second time according to the pH value, adjusting the pH value to be more than 7, and stirring for the second time to obtain a cement retarder;

(5) is made into

And (4) preparing the obtained substance after the secondary stirring into the cement retarder with fixed particles by a disc granulator.

The cement retarders prepared in examples 1-3 were tested, and the contents of the materials are shown in table 1:

TABLE 1 Cement retarder test index

As can be seen from Table 1, in the cement retarder prepared by the device and the method, the contents of the attached water, the calcium sulfate dihydrate, the water-soluble phosphorus pentoxide, the water-soluble fluoride ions and the water-soluble magnesium oxide all meet the use indexes of the cement retarder, the contents of the water-soluble sodium oxide and the water-soluble chloride ions are 0, the setting time is a composite test index, the modified phosphogypsum can be completely used as a setting regulator of cement, and industrial solid wastes such as carbide slag, industrial caustic sludge, fly ash and the like are simultaneously eliminated, so that the production process is simple, the production cost is reduced, the ecological environment is protected, and certain economic benefits are brought.

While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.