Remaining slurry circulating method and device

Abstract

The invention relates to the technical field of concrete product production, in particular to a residual slurry circulation method and a device thereof.The method comprises the following steps that residual slurry is introduced into a treatment tank to be stirred, a defoaming agent and / or a retarder are / is added according to the foam condition of the residual slurry, and the residual slurry is diluted to the target density through water injection; the residual slurry reaching the target density is introduced into a collecting tank, and the collected residual slurry is stored for standby application; pumping the residual slurry in the collecting tank into a storage tank, continuously stirring in the storage tank, and storing the residual slurry for later use; pumping the residual slurry in the collecting tank into a weighing tank, proportionally adding sand, stone, cement, a water reducing agent and silica fume into the residual slurry, continuously stirring, weighing the residual slurry in the weighing tank, and discharging the mixed residual slurry through a discharging pump. According to the residual slurry circulation method and device, the residual slurry generated in the cement concrete pipe pile preparation process can be put into production again, and material waste can be reduced while environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete product production, and particularly to a residual slurry recycling method and device thereof. Background Art

[0002] With the increasing number of power projects, the production demand for electric poles produced to support power equipment has also increased accordingly. In the production process of electric poles, it is necessary to prepare concrete pipe piles. After the existing electric poles are manufactured, residual slurry is often generated. This residual slurry is the waste liquid generated during the process of pouring out the slurry after the manufacture of the electric pole pipe piles. The main components of the residual slurry are cement, water, and other additives, etc. Currently, due to the relatively serious environmental pollution risk problem of the residual slurry, how to recycle and treat the residual slurry is a major problem encountered in the current production process of electric poles.

[0003] In the prior art, the method for treating residual slurry is to use the method of transporting and disposing of it as solid waste after setting and hardening. This treatment method consumes a large amount of manpower and material resources, and the residual slurry contains more than 50% of the gelling materials. Directly discarding it will cause material waste and environmental pollution.

[0004] Therefore, there is a need for a residual slurry recycling device that can treat or recycle residual slurry. Summary of the Invention

[0005] The main object of the present invention is to provide a residual slurry recycling method and device thereof, aiming to solve the problem that the existing residual slurry recycling device is difficult to recycle or treat residual slurry.

[0006] To achieve the above object, the present invention proposes a residual slurry recycling method, which includes the following steps:

[0007] Pass the residual slurry into a treatment tank for stirring, add an antifoaming agent and / or a retarder according to the foam condition of the residual slurry, and dilute the residual slurry with water to the target density;

[0008] Pass the residual slurry that reaches the target density into a collection tank, and store the collected residual slurry for standby;

[0009] Pump the residual slurry in the collection tank to a storage tank, continuously stir and store the residual slurry in the storage tank for standby;

[0010] Pump the residual slurry in the collection tank to a weighing tank, add sand, stone, cement, water reducer, and silica fume to the residual slurry in proportion and continuously stir, weigh the residual slurry in the weighing tank, and discharge the mixed residual slurry through a discharge pump.

[0011] Further, the step of passing the residual slurry into the treatment tank for stirring and adding an antifoaming agent according to the foam condition of the residual slurry further includes:

[0012] Observe the foam situation in the residual pulp and measure the density of the residual pulp, judge the density of the residual pulp and add defoamer according to the density of the residual pulp;

[0013] If the density of the residual pulp is less than 1200 kg / m 3 , add defoamer at a volume ratio of ‰3 and stir. After stirring, observe the density of the residual pulp again. If it is still less than 1200 kg / m 3 , then discard the residual pulp;

[0014] If the density of the residual pulp is in the range of 1200 - 1400 kg / m 3 , add retarder in proportion and dilute the residual pulp with water so that the density of the residual pulp reaches 50 kg / m lower than the measured density 3 ;

[0015] If the density of the residual pulp is in the range of 1400 - 1500 kg / m 3 , add retarder in proportion and dilute the residual pulp with water so that the density of the residual pulp reaches 1400 kg / m 3 ;

[0016] If the density of the residual pulp is in the range of 1500 - 1600 kg / m 3 , add retarder in proportion and dilute the residual pulp with water so that the density of the residual pulp reaches 1500 kg / m 3 ;

[0017] If the density of the residual pulp is in the range of 1600 - 1800 kg / m 3 , add retarder in proportion and dilute the residual pulp with water so that the density of the residual pulp reaches 1600 kg / m 3 ;

[0018] If the density of the residual pulp is 1800 kg / m 3 or above, add retarder in proportion and dilute the residual pulp with water so that the density of the residual pulp reaches 1700 kg / m 3 .

[0019] Furthermore, the step of observing the foam situation in the residual pulp and measuring the density of the residual pulp, judging the density of the residual pulp and adding defoamer according to the density of the residual pulp further includes:

[0020] Use defoamer to defoam the residual pulp, and measure the bulk density and gas content of the residual pulp before and after defoaming;

[0021] After measuring the initial bulk density, place the residual pulp in a negative pressure vacuum kettle for 1 - 2 h under negative pressure;

[0022] Extract the residual pulp with bulk density and filter it, and measure the bulk density of the filtered residual pulp.

[0023] Further, the step of pumping the remaining slurry in the collection tank into the weighing tank, adding sand, stones, cement, water reducing agent, and silica fume to the remaining slurry in proportion and continuously stirring, weighing the remaining slurry in the weighing tank, and discharging the mixed remaining slurry through a discharge pump further includes:

[0024] Input the target weight through a control device for batching, and automatically stop feeding when the target weight is reached;

[0025] When batching is abnormal, unload the material to make the amount of remaining slurry entering the tank meet the proportioning dosage, and discharge the excess remaining slurry;

[0026] During the batching process, continuously stir and reserve the weighing tank, and discharge the mixed remaining slurry through a discharge pump.

[0027] Further, the retarder is an aqueous solution with a concentration of 10% prepared from sodium gluconate powder, and the dosage of the retarder is 6 - 8‰ of the weight of the remaining slurry.

[0028] The present invention also provides a remaining slurry circulation device, and the remaining slurry circulation device applies the remaining slurry circulation method described in any one of the above technical solutions.

[0029] Further, the remaining slurry circulation device includes a treatment tank, a collection tank, a storage tank, and a weighing tank connected in sequence.

[0030] In the present invention, a remaining slurry circulation method and its device are disclosed. By combining the remaining slurry with an antifoaming agent and a retarder and through precise proportions of each component, the accuracy, stability, and durability performance all meet the requirements for the reuse of cement concrete, enabling the remaining slurry to be re - input into the production process of cement concrete, avoiding environmental pollution and raw material waste caused by the direct discharge of the remaining slurry, and improving economic benefits and environmental friendliness. Specific Embodiments

[0031] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, the descriptions involving "first", "second", etc. in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] It can be understood that in order to ensure the designability and quality stability of concrete, it is necessary to recycle the surplus slurry to ensure a certain degree of homogeneity of the surplus slurry used for producing electric poles. In the prior art, there are still the following problems in the application of surplus slurry: the surplus slurry coagulates quickly, is difficult to store, and with the passage of time, the adverse effect on the fluidity of concrete gradually increases; the air content of the surplus slurry is too high, resulting in poor internal pore structure after the concrete mixed with the surplus slurry is formed; the bulk density of the surplus slurry fluctuates greatly, and low-capacity (<1400 kg / m 3 ) surplus slurry appears from time to time, and the requirement for homogenization treatment is high.

[0035] According to the existing test results, using surplus slurry to replace part of the cementitious materials and water in concrete will have a certain impact on the workability, strength and forming quality of concrete. Especially for inclined feeding concrete, the fluidity changes greatly after using surplus slurry, and its stability is difficult to control. In order to meet the requirements of inclined feeding, it is necessary to design the mix proportion of concrete mixed with surplus slurry to determine the optimal surplus slurry dosage, conversion coefficient, and the components and their proportions of the additives added to the surplus slurry into cement.

[0036] Among them, the water dilution and thickening treatment involved in the present invention constitute the surplus slurry homogenization treatment scheme, and the surplus slurry homogenization treatment scheme is specifically as follows:

[0037] 1. Dilution treatment (taking the case when the bulk density > 1350 as an example):

[0038] Taking the bulk density of the surplus slurry as the control index, through the treatment method of adding water for dilution, the bulk density of the surplus slurry is kept within the same range.

[0039] According to the bulk density ρ0 of the surplus slurry, the set target bulk density ρ1, and the water density ρ w , for the surplus slurry with a measured bulk density of ρ0 per unit volume (1 m 3 ), the amount of water required to dilute it to the bulk density ρ1 is:

[0040] M w = ρ w * (ρ0 - ρ1) / (ρ1 - ρ w )

[0041] 2. Thickening treatment (taking the case where the unit weight < 1350 as an example):

[0042] According to the measured unit weight ρ0 of the residual slurry, the set target unit weight ρ1, and the cement density ρ c ≈ 3100 kg / m 3 , the single - mass of cement required to increase the unit weight of the residual slurry from ρ0 to ρ1 is:

[0043] M c = ρ c *(ρ1 - ρ0) / (ρ c - ρ1)

[0044] In the step of proportionally adding sand, stones, cement, water - reducing agent, and silica fume into the residual slurry and continuously stirring involved in the present invention, the specific proportions are as follows:

[0045] Cement 350 - 450 kg / m 3 ;

[0046] Sand grains 750 - 800 kg / m 3 ;

[0047] Stone blocks 900 - 1000 kg / m 3 ;

[0048] Residual slurry 200 - 300 kg / m 3 ;

[0049] Water - reducing agent 8.5 - 10.5 kg / m 3 ;

[0050] Water 80 - 85 kg / m 3 ;

[0051] Silica fume 20 - 25 kg / m 3 .

[0052] In this regard, the present invention discloses specific application examples 1 - 4 and control examples 1 - 2 and conducts performance tests, which are as follows:

[0053] 1. Test scheme for the dosage of retarder in the residual slurry

[0054] 1.1 Setting time and steam - curing strength

[0055] The retarder is an aqueous solution of sodium gluconate with a concentration of 10%.

[0056] The experimental method for setting time: Conducted in accordance with GB / T 1346 - 2011 "Test Methods for Water Requirement of Normal Consistency, Setting Time and Soundness of Cement".

[0057] The compressive strength test was carried out with reference to GB 175-2007 "Common Portland Cement". After the test blocks were formed, steam curing was immediately carried out, and the pressure test was carried out within 0.5 h after steam curing.

[0058] Table 1 Mix ratios of different examples in the setting time and steam curing strength of surplus slurry

[0059] Example Group Cement / g Residual Slurry / g Water / g Retarder / g Control Example 1 2500 0 872 0 Control Example 2 2067 800 605 0 Example 1 2067 800 605 2.5 Example 2 2067 800 605 7.5 Example 3 2067 800 605 1.25 Example 4 2067 800 605 1.75

[0060] Experimental conclusion:

[0061] In this experiment, the setting time and compressive strength test of the surplus slurry cement paste with retarding agent dosages of 0, 0.1‰, 0.3‰, 0.5‰, and 0.7‰ were determined. By comparing the setting time and compressive strength, the relationship between the retarding agent dosage in the surplus slurry and the setting time and strength was found, and it was decided whether other dosage tests were needed according to the results.

[0062] 2. Setting time and fluidity test

[0063] 2.1 Setting time test

[0064] The specific test method is as follows:

[0065] S1. Dilute the surplus slurry in each group of examples to reach the target bulk density of 1600 kg / m 3 ;

[0066] S2. Conduct the setting time test and the fluidity test of the cement paste, and select the appropriate retarding agent dosage according to the results;

[0067] S3. Use the surplus slurry with retarding agent for mix proportion design, and observe and record the change of its steam curing strength.

[0068] Among them, the specific retarding agent dosages in each group of examples are as follows:

[0069] Table 2 Retarding agent dosages of surplus slurry in each example group in the setting time test

[0070]

[0071] Table 3 Setting times of each example group in the setting time test

[0072] Example Group Initial Setting Time h Final Setting Time h Example 1 9 24 Example 2 10 26 Example 3 8 22 Example 4 11 25 Control Example 2 7 20

[0073] Experimental conclusion:

[0074] From the experimental data of the above four groups of examples and the control example, it can be seen that the working performance of the four groups of examples in the present invention is excellent, and the initial setting time and final setting time are both in the range of excellent performance, which can meet the concrete applications in various functional construction environments, while the working performance of the control example 2 is poor and the construction difficulty is large.

[0075] 2.2 Slump Flow Test

[0076] Experimental method: The slump flow test was carried out in accordance with GB / T 8077. The slump flow was detected starting from the time of receiving the material, and the detection was carried out every 30 minutes. The specific situation is as follows:

[0077] Table 4 Retained Slurry Retarder Dosages in Each Example Group of the Slump Flow Test

[0078]

[0079] Table 5 Experimental Data of Each Example Group in the Slump Flow Test

[0080]

[0081] Experimental conclusion:

[0082] In this experiment, the slump flow tests of the retained slurry cement paste with retarder dosages of 0 g, 0.1 g, 0.07 g, 0.05 g, and 0.03 g were carried out. By comparing the initial flowability, 30 - minute flowability, 60 - minute flowability, and 90 - minute flowability, the relationship between the flowability of the cement paste and the retarder was found. Combining the flowability results of Examples 1 - 4 and Comparative Example 2, it can be seen that the retarder can significantly improve the time - dependent retention ability of the paste flowability, and the higher the dosage, the better the effect.

[0083] In the present invention, a retained slurry recycling device is also proposed. The retained slurry recycling device includes a treatment tank, a collection tank, a storage tank, a weighing tank, and a control system and a pump group that cooperate with it. The operator passes the retained slurry through the treatment tank, collection tank, storage tank, and weighing tank in sequence through the control system.

[0084] In this embodiment, when the operator performs the retained slurry recycling process through this retained slurry recycling device, it is necessary to ensure that there are no foreign objects (including large - sized retained slurry lumps) blocking the pipeline, switch knobs, etc. in the retained slurry recycling device. Then, start the stirring system in the treatment tank through the control system to stir the collected retained slurry, add defoaming agent according to the foam situation, and dilute or thicken the retained slurry in the treatment tank according to the density of the retained slurry until the retained slurry reaches the target bulk density. Then, transport the retained slurry from the treatment tank to the collection tank. The collection tank is used to collect multiple batches of treated retained slurry and conduct temporary storage. When the retained slurry needs to be used, the operator pumps the retained slurry in the collection tank to the storage tank and stirs it. It can be understood that the installation positions of the collection tank and the storage tank are different. The storage tank is used to facilitate pumping the retained slurry to the weighing tank for batching. When the retained slurry is pumped from the storage tank to the weighing tank, the operator batches and mixes the retained slurry in the weighing tank through the operating system, and then pumps and discharges the mixture after mixing.

[0085] In this embodiment, the present invention includes a collection tank and a storage tank. The collection tank can homogenize residual slurry with different concentrations and then store and mix them separately through the collection tank and the storage tank. The installation positions of the collection tank and the storage tank are set on workstations at different vertical heights and / or different horizontal positions according to actual production requirements. Multiple tanks can store residual slurry with different concentrations respectively, and the residual slurry in multiple tanks can be directly connected or serially connected to the weighing tank, facilitating weighing and batching at the weighing tank according to residual slurry with different concentrations. The multiple tanks being arranged at different positions in the space at intervals can also prevent the residual slurry from solidifying during storage or transportation, and can improve production efficiency.

[0086] Combining all the above embodiments, in the present invention, a method and device for residual slurry circulation are disclosed. By combining the residual slurry with defoaming agent and retarder and through the precise proportions of each component, the accuracy, stability, and durability performance all meet the requirements for the reuse of cement concrete. The present invention enables the residual slurry to be re-introduced into the production process of cement concrete, especially inclined feeding concrete, avoiding environmental pollution and raw material waste caused by the direct discharge of residual slurry, and enhancing economic benefits and environmental friendliness.

[0087] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made using the description of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A residual slurry circulation method, characterized in that, It includes the following steps: Feed the residual pulp into a treatment tank for stirring, add defoamer and / or retarder according to the foam condition of the residual pulp, and dilute the residual pulp to the target density by injecting water; Feed the residual pulp that has reached the target density into a collection tank, and store the collected residual pulp for standby; Pump the residual pulp in the collection tank to a storage tank, continuously stir and store the residual pulp in the storage tank for standby; Pump the residual pulp in the collection tank into a weighing tank, add sand, stone, cement, water reducer and silica fume to the residual pulp in proportion and continuously stir, weigh the residual pulp in the weighing tank, and discharge the mixed residual pulp through a discharge pump.

2. The residual slurry circulation method according to claim 1, characterized in that, The step of feeding the residual pulp into the treatment tank and stirring it, and adding defoamer according to the foam condition of the residual pulp further includes: Observe the foam condition in the residual pulp and measure the density of the residual pulp, judge the density of the residual pulp and add defoamer according to the density of the residual pulp; If the density of the residual pulp is less than 1200 kg / m 3 , add defoamer at a volume ratio of ‰3 and stir. After stirring, observe the density of the residual pulp again. If it is still less than 1200 kg / m 3 , then discard the residual pulp; If the density of the remaining slurry is between 1200 and 1400 kg / m 3 , then add a retarder proportionally and dilute the remaining slurry with water so that the density of the remaining slurry reaches 50 kg / m lower than the measured density 3 ; If the density of the remaining slurry is between 1400 and 1500 kg / m 3 , then add a retarder proportionally and dilute the remaining slurry with water to make the density of the remaining slurry reach 1400 kg / m 3 ; If the density of the remaining slurry is between 1500 and 1600 kg / m 3 , then add a retarder proportionally and dilute the remaining slurry with water to make the density of the remaining slurry reach 1500 kg / m 3 ; If the density of the remaining slurry is between 1600 and 1800 kg / m 3 , then add a retarder proportionally and dilute the remaining slurry with water to make the density of the remaining slurry reach 1600 kg / m 3 ; If the density of the residual slurry is above 1800 kg / m 3 , add a retarder proportionally and dilute the residual slurry with water so that the density of the residual slurry reaches 1700 kg / m 3 .

3. The residual slurry circulation method according to claim 1, characterized in that The step of observing the foam condition in the residual pulp and measuring the density of the residual pulp, judging the density of the residual pulp and adding defoamer according to the density of the residual pulp further includes: Use defoamer to defoam the residual pulp, and measure the bulk density and air content of the residual pulp before and after defoaming; After measuring the initial bulk density, place the residual pulp in a negative pressure vacuum kettle at a negative pressure for 1 - 2 hours; Extract the residual pulp with the ground bulk density and filter it, and measure the bulk density of the filtered residual pulp.

4. The residual slurry circulation method according to claim 1, characterized in that, The step of pumping the residual pulp in the collection tank into a weighing tank, adding sand, stone, cement, water reducer and silica fume to the residual pulp in proportion and continuously stir, weighing the residual pulp in the weighing tank, and discharging the mixed residual pulp through a discharge pump further includes: Input the target weight through a control device for batching, and automatically stop feeding when the target weight is reached; When the batching is abnormal, discharge the material so that the amount of residual pulp entering the tank meets the ratio dosage, and discharge the excess residual pulp; During the batching process, continuously stir and standby in the weighing tank, and discharge the mixed residual pulp through a discharge pump.

5. The residual pulp circulation method according to claim 1, characterized in that, The retarder is an aqueous solution with a concentration of 10% prepared from sodium gluconate powder, and the dosage of the retarder is 6 - 8‰ of the weight of the residual pulp.

6. A residual slurry circulation device, characterized in that, The residual pulp circulation device applies the residual pulp circulation method as described in any one of claims 1 - 5.

7. The residual pulp circulation device according to claim 6, characterized in that, The residual pulp circulation device includes a treatment tank, a collection tank, a storage tank and a weighing tank connected in sequence.

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