阅读说明：本技术 一种混凝土废浆浓缩液悬浮稳定剂及其制备方法 (Suspension stabilizer for concrete waste slurry concentrated solution and preparation method thereof ) 是由 杨文� 曾超 王军 刘明 高育欣 吴雄 张磊 王福涛 高达 于 2021-09-16 设计创作，主要内容包括：本发明公开了一种混凝土废浆浓缩液悬浮稳定剂及其制备方法,属于混凝土废浆浓缩技术领域,该混凝土废浆浓缩液悬浮稳定剂由以下质量百分比的原料组成：膨胀性黏土1～2％、水溶性糖类5～15％、纤维素醚衍生物1～3％、丙三醇60～75％、磷酸酯化试剂15～25％、去离子水2～5％和催化剂0.5～3％。本发明以膨胀性黏土、水溶性糖类、纤维素醚衍生物、丙三醇和磷酸酯化试剂为主要原料,在催化剂的作用下,通过羟基与磷酸基团的酯化反应制得混凝土废浆浓缩液悬浮稳定剂；通过各组分间的协同作用,显著提升了混凝土废浆浓缩液在存储和应用过程中的稳定性与匀质性,减少了泌水分层以及板结现象。(The invention discloses a concrete waste slurry concentrated solution suspension stabilizer and a preparation method thereof, belonging to the technical field of concrete waste slurry concentration, wherein the concrete waste slurry concentrated solution suspension stabilizer is prepared from the following raw materials in percentage by mass: 1-2% of swellable clay, 5-15% of water-soluble saccharide, 1-3% of cellulose ether derivative, 60-75% of glycerol, 15-25% of phosphating agent, 2-5% of deionized water and 0.5-3% of catalyst. The preparation method takes expansive clay, water-soluble saccharides, cellulose ether derivatives, glycerol and a phosphoric acid esterification reagent as main raw materials, and prepares the suspension stabilizer of the concrete waste slurry concentrated solution through the esterification reaction of hydroxyl and phosphoric acid groups under the action of a catalyst; through the synergistic effect among all the components, the stability and the homogeneity of the concrete waste slurry concentrated solution in the storage and application processes are obviously improved, and the phenomena of bleeding stratification and hardening are reduced.)

1. The suspension stabilizer for the concrete waste slurry concentrated solution is characterized by comprising the following raw materials in percentage by mass: 1-2% of swellable clay, 5-15% of water-soluble saccharide, 1-3% of cellulose ether derivative, 60-75% of glycerol, 15-25% of phosphating agent, 2-5% of deionized water and 0.5-3% of catalyst.

2. The concrete waste slurry concentrated solution suspension stabilizer according to claim 1, which is prepared from the following raw materials in percentage by mass: 1-2% of swellable clay, 6-10% of water-soluble saccharide, 1-3% of cellulose ether derivative, 60-70% of glycerol, 15-20% of phosphating agent, 2-5% of deionized water and 0.5-2% of catalyst.

3. The concrete waste slurry concentrated solution suspension stabilizer according to claim 2, which is prepared from the following raw materials in percentage by mass: 1% of swelling clay, 6% of water-soluble saccharides, 1% of cellulose ether derivatives, 70% of glycerol, 17% of a phosphating agent, 3% of deionized water and 2% of a catalyst.

4. The concrete waste slurry concentrate suspension stabilizer according to any one of claims 1 to 3, wherein the swelling clay is at least one of kaolinite, montmorillonite, illite, and chlorite.

5. The suspension stabilizer for a waste concrete pulp concentrate according to any one of claims 1 to 3, wherein the water-soluble saccharide is at least one of glucose, mannose, fructose, galactose, sucrose, lactose and maltose.

6. The concrete waste slurry concentrate suspension stabilizer according to any one of claims 1 to 3, wherein the cellulose ether derivative is at least one of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose.

7. The suspension stabilizer for a concrete waste slurry concentrate according to any one of claims 1 to 3, wherein the phosphating agent is at least one of phosphorus trichloride, phosphorus pentoxide, pyrophosphoric acid and polyphosphoric acid.

8. The concrete waste slurry concentrate suspension stabilizer according to any one of claims 1 to 3, wherein the catalyst is at least one of p-toluenesulfonic acid, formic acid, acetic acid, sulfuric acid, sulfurous acid, phosphoric acid and phosphorous acid.

9. The method for preparing a suspension stabilizer for a concrete waste slurry concentrate according to any one of claims 1 to 8, wherein the suspension stabilizer is prepared by esterification of hydroxyl groups and phosphoric acid groups with a catalyst, using a swelling clay, a water-soluble saccharide, a cellulose ether derivative, glycerol and a phosphating agent as main raw materials.

10. The method for preparing the suspension stabilizer for the concrete waste slurry concentrate according to claim 9, comprising the steps of:

step (1): adding glycerol and deionized water into a reaction vessel, stirring and mixing uniformly at room temperature, adding water-soluble saccharides and cellulose ether derivatives, heating to 60-80 ℃, and continuously stirring for 2-4 hours to obtain a clear solution;

step (2): adding expansive clay into the clarified solution obtained in the step (1), and continuously stirring for 1-3 hours to obtain a uniform suspension;

and (3): adding a catalyst into the suspension obtained in the step (2), stirring for 5-10 min, then continuously adding a phosphating reagent within 1-2 h, and reacting for 4-8 h at the temperature of 70-90 ℃ to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Technical Field

The invention relates to the technical field of concrete waste slurry concentration, in particular to a concrete waste slurry concentrated solution suspension stabilizer and a preparation method thereof.

Background

The concrete waste slurry is liquid slurry obtained by separating sand and stone from waste water, waste residue and the like generated after cleaning of relevant equipment for concrete production, transportation and construction through sand and stone separation equipment. The concrete waste slurry consists of solid slag (solid particles) and clear liquid, wherein the solid slag mainly comprises partial unhydrated gelled materials, hydration products, a small amount of stone powder, mud and other solid particles; the waste slurry clarifying solution is supernatant liquor of waste slurry after standing for a period of time, the pH value of the supernatant liquor is alkaline, and in addition, the supernatant liquor also contains some soluble inorganic salts, additive ions and the like of concrete. If the waste water is directly discharged without being treated, the waste water can cause great harm to the ecology and also can not meet the requirement of environmental protection. At present, the concentration and separation of the waste concrete slurry are an environment-friendly and efficient treatment means, and the clean and high-value utilization of the waste concrete slurry can be realized.

After the concrete waste slurry is concentrated and separated, the concrete waste slurry can be fully ground, wherein solid particles can reach the nanometer size, and the waste slurry concentrated solution after physical grinding and activation can be used as a cementing material to be doped into concrete, so that resource utilization is realized. However, there are two problems in the application process: firstly, the waste slurry concentrated solution after grinding contains a large amount of nano particles, the specific surface area is large, the surface energy is high, agglomeration and sedimentation are easy to occur, even hardening is caused, the slurry concentration is uneven, and fluctuation is generated in the application process. Secondly, the concentrated solution contains a certain amount of unhydrated gelled material particles, and hydration reaction occurs in the storage process, so that agglomeration is caused, the activity of the slurry is reduced, and the development of the concrete strength in the application process is not facilitated. The two aspects are not beneficial to the homogenization and storage of the slurry, and the effective content fluctuates in the application process, so that the application effect is influenced. Therefore, a special suspension stabilizer which can simultaneously inhibit particle agglomeration and cement hydration needs to be developed for a concrete waste slurry concentrated solution system.

Disclosure of Invention

In view of the above disadvantages, the present invention aims to provide a suspension stabilizer for a concrete waste slurry concentrated solution and a preparation method thereof, which can effectively solve the problems of poor stability, poor homogeneity, easy occurrence of water stratification and hardening phenomena, etc. of the ground concrete waste slurry concentrated solution during storage and application.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a concrete waste slurry concentrated solution suspension stabilizer which is prepared from the following raw materials in percentage by mass: 1-2% of swellable clay, 5-15% of water-soluble saccharide, 1-3% of cellulose ether derivative, 60-75% of glycerol, 15-25% of phosphating agent, 2-5% of deionized water and 0.5-3% of catalyst.

Further, the concrete waste slurry concentrated solution suspension stabilizer is composed of the following raw materials in percentage by mass: 1-2% of swellable clay, 6-10% of water-soluble saccharide, 1-3% of cellulose ether derivative, 60-70% of glycerol, 15-20% of phosphating agent, 2-5% of deionized water and 0.5-2% of catalyst.

Further, the concrete waste slurry concentrated solution suspension stabilizer is composed of the following raw materials in percentage by mass: 1% of swelling clay, 6% of water-soluble saccharides, 1% of cellulose ether derivatives, 70% of glycerol, 17% of a phosphating agent, 3% of deionized water and 2% of a catalyst.

Further, the swelling clay is at least one of kaolinite, montmorillonite, illite, and chlorite.

The expansive clay layers contain a large amount of hydroxyl groups, can be subjected to modified grafting to obtain monodisperse suspension, forms a network skeleton structure, limits the sedimentation of solid particles, has adsorbability, thickening property, thixotropy and swelling property, and improves the suspension stability of the concentrated concrete waste slurry.

Furthermore, the particle size of the expansive clay is less than or equal to 20 um.

The smaller the particle size of the expansive clay is, the more favorable the suspension stability of the concrete waste slurry concentrated solution is.

Further, the water-soluble saccharide is at least one of glucose, mannose, fructose, galactose, sucrose, lactose and maltose.

The water-soluble saccharide is a polyhydroxy compound, and is grafted to the surface of expansive clay, so that the wettability of the concrete waste slurry concentrated solution and the adsorption capacity of solid particles can be improved, and the suspension dispersion effect of the concrete waste slurry concentrated solution is improved. Meanwhile, the water-soluble saccharides are used as concrete retarders, so that the reaction of unhydrated particles can be inhibited, and hardening and sedimentation phenomena caused by hydration reaction are reduced.

Further, the cellulose ether derivative is at least one of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose.

The cellulose ether derivative can increase the viscosity of the concentrated solution slurry of the waste concrete slurry and improve the dispersion and suspension effects on solid particles.

Further, the molecular weight of the cellulose ether derivative is 5000-30000 g/mol.

The cellulose ether derivative of the invention has too high molecular weight, which can cause too high viscosity of the reaction solution to be unfavorable for subsequent reaction.

Further, the phosphating agent is at least one of phosphorus trichloride, phosphorus pentoxide, pyrophosphoric acid and polyphosphoric acid.

In the invention, a phosphate esterification reagent performs esterification reaction on partial hydroxyl in a system, so that a phosphate modified polyhydroxy structure is introduced, the adsorption group of a suspending agent is increased, and the adsorption and dispersion effects on solid particles are improved; meanwhile, the phosphate group has the function of inhibiting hydration, and the phenomena of hardening and sedimentation caused by hydration are reduced.

Further, the catalyst is at least one of p-toluenesulfonic acid, formic acid, acetic acid, sulfuric acid, sulfurous acid, phosphoric acid and phosphorous acid.

The invention also provides a preparation method of the concrete waste slurry concentrated solution suspension stabilizer, which takes expansive clay, water-soluble saccharides, cellulose ether derivatives, glycerol and a phosphating agent as main raw materials and is prepared by the esterification reaction of hydroxyl and phosphate groups under the action of a catalyst.

Further, the preparation method of the concrete waste slurry concentrated solution suspension stabilizer comprises the following steps:

step (1): adding glycerol and deionized water into a reaction vessel, stirring and mixing uniformly at room temperature, adding water-soluble saccharides and cellulose ether derivatives, heating to 60-80 ℃, and continuously stirring for 2-4 hours to obtain a clear solution;

step (2): adding expansive clay into the clarified solution obtained in the step (1), and continuously stirring for 1-3 hours to obtain a uniform suspension;

and (3): adding a catalyst into the suspension obtained in the step (2), stirring for 5-10 min, then continuously adding a phosphating reagent within 1-2 h, and reacting for 4-8 h at the temperature of 70-90 ℃ to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Further, the rotating speed of stirring in the step (2) is 6000-10000 rpm.

According to the invention, the swelling and dissolution of clay can be promoted by adopting a high-speed stirring mode in the step (2), so that uniform suspension is obtained.

Further, the temperature in step (1) is preferably 70 ℃; the temperature in step (3) is preferably 80 ℃.

In summary, the invention has the following advantages:

1. the invention provides a suspension stabilizer for a concrete waste slurry concentrated solution, which takes expansive clay, water-soluble saccharides, cellulose ether derivatives, glycerol and a phosphating reagent as main raw materials, obviously improves the stability and the homogeneity of the concrete waste slurry concentrated solution in the storage and application processes through the synergistic effect of the components, and reduces the phenomena of bleeding stratification and hardening.

2. According to the invention, a large amount of hydroxyl contained between the expansive clay layers is used for modification grafting to form monodisperse suspension, so that a network skeleton structure is obtained, the sedimentation of solid particles is limited, and the slurry has adsorbability, thickening property, thixotropy and swelling property, and the suspension stability of the slurry is improved.

3. According to the invention, the polyhydroxy structure of the saccharide is grafted to the surface of the expansive clay, so that the wettability of the waste concrete slurry and the adsorption capacity of solid particles are improved, and the suspension dispersion effect is improved; meanwhile, the saccharides are used as a common concrete retarder, can inhibit the reaction of unhydrated particles, and reduce hardening and settlement phenomena caused by hydration reaction.

4. In the invention, a phosphate esterification reagent in the suspension stabilizer of the concrete waste slurry concentrated solution performs esterification reaction on partial hydroxyl in a system, thereby introducing a phosphate modified polyhydroxy structure, increasing the adsorption groups of the suspension agent and promoting the adsorption and dispersion effects on solid particles; meanwhile, the phosphate group has the function of inhibiting hydration, and the phenomena of hardening and sedimentation caused by hydration are reduced.

5. The method adopts the glycerol as a reaction solvent and a reactant at the same time, and the glycerol as a micromolecular polyhydroxy compound can enter clay layers more easily, increase the clay expansion distance to form modified active sites, and react with a phosphate esterification reagent to form polyhydroxy phosphate, thereby playing a role in dispersing and coagulating solid particles in the waste pulp concentrated solution.

6. The raw materials involved in the invention are all easily available chemical products, the preparation method is simple, no additional reaction solvent is required to be added in the synthetic process, the environment is friendly, and the method is suitable for popularization and application and has practical application value.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 2.8g of deionized water in a reaction vessel, stirring and mixing uniformly, then adding 12.6g of maltose and 1.4g of hydroxypropyl methyl cellulose, heating to 70 ℃, and continuously stirring for 2 hours to obtain a clear solution;

(2) weighing 1.4g of chlorite, adding the chlorite into the solution in the step 1), and continuously stirring at a high speed of 6000rpm for 1h to obtain a uniform suspension;

(3) adding 0.7g of phosphorous acid into the suspension obtained in the step 2), stirring for 5min, then continuously adding 21g of pyrophosphoric acid in 1h, controlling the reaction temperature at 70 ℃, and reacting for 8h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Example 2

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 3.1g of deionized water in a reaction vessel, stirring and mixing uniformly, then adding 23.1g of lactose and 1.5g of hydroxypropyl cellulose, heating to 80 ℃, and continuously stirring for 4 hours to obtain a clear solution;

(2) weighing 1.5g of illite, adding the illite into the solution obtained in the step 1), and continuously stirring at a high speed of 10000rpm for 3 hours to obtain a uniform suspension;

(3) adding 1.5g of phosphoric acid into the suspension in the step 2), stirring for 10min, then continuously adding 23.1g of phosphorus trichloride within 2h, controlling the reaction temperature at 90 ℃, and reacting for 7h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Example 3

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 4.6g of deionized water in a reaction vessel, stirring and mixing uniformly, then adding 7.7g of sucrose and 4.6g of hydroxyethyl cellulose, heating to 70 ℃, and continuously stirring for 3 hours to obtain a clear solution;

(2) weighing 3.1g of kaolinite, adding the kaolinite into the solution obtained in the step 1), and continuously stirring at a high speed of 9000rpm for 2 hours to obtain a uniform suspension;

(3) adding 1.5g of sulfurous acid into the suspension obtained in the step 2), stirring for 8min, then continuously adding 32.3g of phosphorus pentoxide within 2h, controlling the reaction temperature at 75 ℃, and reacting for 6h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Example 4

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 3.8g of deionized water in a reaction container, stirring and mixing uniformly, then adding 7.7g of galactose and 1.5g of ethyl cellulose, heating to 75 ℃, and continuously stirring for 4 hours to obtain a clear solution;

(2) weighing 1.5g of montmorillonite, adding the montmorillonite into the solution in the step 1), and continuously stirring at a high speed of 7000rpm for 1.5h to obtain a uniform suspension;

(3) adding 0.8g of sulfuric acid into the suspension obtained in the step 2), stirring for 6min, then continuously adding 38.5g of polyphosphoric acid within 2h, controlling the reaction temperature at 85 ℃, and reacting for 5h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Example 5

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 4.3g of deionized water in a reaction container, stirring and mixing uniformly, then adding 8.6g of glucose and 1.4g of carboxymethyl cellulose, heating to 70 ℃, and continuously stirring for 3 hours to obtain a clear solution;

(2) weighing 1.4g of montmorillonite, adding the montmorillonite into the solution in the step 1), and continuously stirring at a high speed of 8000rpm for 3h to obtain a uniform suspension;

(3) adding 2.9g of p-toluenesulfonic acid into the suspension obtained in the step 2), stirring for 10min, then continuously adding 24.3g of polyphosphoric acid within 2h, controlling the reaction temperature at 80 ℃, and reacting for 6h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Example 6

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 8.3g of deionized water in a reaction container, stirring and mixing uniformly, then adding 10g of mannose and 1.7g of methylcellulose, heating to 80 ℃, and continuously stirring for 2 hours to obtain a clear solution;

(2) weighing 1.7g of kaolinite, adding the kaolinite into the solution obtained in the step 1), and continuously stirring at a high speed of 7000rpm for 2.5h to obtain a uniform suspension;

(3) adding 3.3g of acetic acid into the suspension obtained in the step 2), stirring for 5min, then continuously adding 41.7g of pyrophosphoric acid within 1h, controlling the reaction temperature at 90 ℃, and reacting for 8h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Example 7

A preparation method of a concrete waste slurry concentrated solution suspension stabilizer comprises the following specific steps:

(1) weighing 100g of glycerol and 2.7g of deionized water in a reaction container, stirring and mixing uniformly, then adding 6.7g of fructose and 2g of carboxymethyl cellulose, heating to 70 ℃, and continuously stirring for 3 hours to obtain a clear solution;

(2) weighing 1.3g of illite, adding the illite into the solution obtained in the step 1), and continuously stirring at 9000rpm for 2h at a high speed to obtain a uniform suspension;

(3) adding 0.7g of formic acid into the suspension obtained in the step 2), stirring for 10min, then continuously adding 20g of phosphorus pentoxide within 2h, controlling the reaction temperature at 70 ℃, and reacting for 5h to obtain the concrete waste slurry concentrated solution suspension stabilizer.

Experimental example 1

The suspension stabilizer of the concrete waste slurry concentrated solution obtained in the embodiment 1-7 and other similar products are subjected to bleeding performance and bottom slurry rheological performance tests. The size of the dispersing and suspending capacity is judged by comparing the bleeding amount of the concentrated solution and the viscosity of the bottom layer slurry in the same standing time. The lower the bleeding amount is, the better the suspension dispersion effect is, the lower the viscosity of the bottom layer slurry is, the lower the settlement hardening degree is, and vice versa.

The baseline group in this example did not contain any suspension stabilizer. Comparative example 1 is prepared by directly compounding the raw materials in the proportion described in example 5 in the invention by a one-pot method (namely, the raw materials of each component are added into a reaction vessel together and react for 8 hours at the temperature of 70 ℃); comparative example 2 differs from example 5 of the present invention only in that: the concrete waste slurry concentrated solution suspension stabilizer is prepared without adding expansive clay; comparative example 3 differs from example 5 of the present invention only in that: the concrete waste slurry concentrated solution suspension stabilizer is prepared without adding water-soluble saccharides; comparative example 4 differs from example 5 of the present invention only in that: the concrete waste slurry concentrated solution suspension stabilizer is prepared without adding a phosphate esterification reagent; comparative example 5 is a commercially available carboxymethyl cellulose ether; comparative example 6 is commercially available bentonite; comparative example 7 is a polycarboxylic acid water reducing agent. Uniformly stirring the ground concrete waste slurry concentrated solution with the solid content of 40%, placing 800g of the concrete waste slurry concentrated solution into a 1000mL measuring cylinder, respectively sealing and standing for 1 day, 3 days and 7 days, and testing the bleeding quality, wherein the test results are shown in Table 1.

Table 1 bleeding amount comparison of concrete concentrates of examples and comparative examples

The data in table 1 show that the amount of bleeding is reduced compared to the reference group, the bleeding rate is reduced from 5% to 3.6%, and the maximum reduction is 1.4%. The bleeding rate of the suspension stabilizer prepared by adding the suspending stabilizer is the lowest, compared with a reference group, the bleeding rate of a concentrated solution is reduced from 5% to 0.25%, the maximum reduction amplitude is 4.75%, and the bleeding rate is far lower than that of a comparative example. The bleeding rate of comparative examples 1 to 4 is much higher than that of examples 1 to 7, which shows that the preparation method of the invention introduces the swelling clay, the water-soluble saccharide and the phosphating agent into the suspension stabilizer of the waste pulp concentrated solution, so that the suspension dispersion effect can be effectively improved, and the bleeding settlement can be reduced. Similarly, the bleeding rate of comparative examples 5 to 7 is higher than that of examples 1 to 7, which shows that the waste pulp suspension stabilizer prepared by the invention has better and excellent effect.

Experimental example 2

All comparative examples and examples in this example were identical to those in Experimental example 1, and the test samples were obtained by allowing each experimental group in Experimental example 1 to stand for 7 days, taking a concentrate of the waste slurry from the lower 20cm height of the measuring cylinder, and measuring the viscosity at different rotational speeds with a rotational viscometer, and the results are shown in Table 2.

TABLE 2 comparison of viscosity of lower 20cm concrete concentrates of examples and comparative examples

The data in Table 2 show that the viscosity of the lower 20cm of waste slurry concentrates added to the comparative and example samples was reduced at different rotation speeds compared to the baseline group, indicating that both the comparative and inventive samples inhibited the settling hardening of the concentrates. Compared with the viscosity value, the viscosity of the bottom layer of the concentrated solution added with the suspension stabilizer is lower after standing and settling, which shows that the product of the invention can greatly reduce the settling hardening of the waste slurry concentrated solution. The viscosity of the bottom layer waste slurry concentrated solution of the comparative examples 1 to 4 is much higher than that of the examples 1 to 7, which shows that the preparation method of the invention introduces the expansive clay, the water-soluble saccharide and the phosphatizing reagent into the suspension stabilizer of the waste slurry concentrated solution, so that the suspension dispersion effect can be effectively improved, and the settlement hardening of the waste slurry concentrated solution can be reduced. Similarly, the viscosity of the concentrate of comparative examples 5 to 7 is higher than that of examples 1 to 7, which shows that the waste pulp suspension stabilizer prepared by the invention has better excellent dispersing, suspending and stabilizing effects.

In summary, the suspension stabilizer for the concrete waste slurry concentrated solution and the preparation method thereof provided by the invention form a network skeleton structure by using the expansive clay, can limit the sedimentation of solid particles, and simultaneously has adsorbability, thickening property, thixotropy and swelling property, and improves the suspension stability of slurry. The polyhydroxy structure of the saccharides is grafted to the clay surface, so that the wettability of the waste concrete slurry and the adsorption capacity of solid particles are improved, and the suspension dispersion effect is improved; meanwhile, the water-soluble saccharides are used as concrete retarders, so that the reaction of unhydrated particles can be inhibited, and hardening and sedimentation phenomena caused by hydration reaction are reduced. Meanwhile, a phosphate group modified polyhydroxy structure is introduced, so that the adsorption groups of the suspending agent are increased, and the adsorption and dispersion effects on solid particles are improved; meanwhile, the phosphate group has the function of inhibiting hydration, and the phenomena of hardening and sedimentation caused by hydration are reduced. The synergistic effect of the multiple effects plays a role in excellent dispersion, suspension and stabilization of the waste slurry and slag concentrated solution. The suspension stabilizer for the concrete waste slurry concentrated solution can effectively improve the stability and the homogeneity of the concrete waste slurry concentrated solution in the storage process, and reduce the phenomena of bleeding stratification and hardening.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to supplement or replace the specific embodiments described by those skilled in the art without inventive faculty.