Flocculating agent composition, flocculating agent and preparation method thereof

Abstract

The invention provides a flocculant composition, a flocculant and a preparation method thereof. The flocculant composition is prepared from the following components in percentage by mass: 50 to 75 percent of polyacrylamide, 20 to 45 percent of cationic surface active agent and 1 to 10 percent of coagulant aid. The cationic surface active agent is added into the flocculating agent composition, so that the interaction between the flocculating agent composition and minerals can be enhanced, the flocculating effect of tailings can be improved while the dosage of the flocculating agent composition is reduced, the electrical property of the surface of the micro-fine-particle clay mineral can be reduced, the hydrophobicity of the surface of the micro-fine-particle mineral can be improved, and the water resistance of the micro-fine-particle clay mineral can be improved. And thus, the turbidity of tailing return water can be reduced and the sedimentation rate can be increased in slime water flocculation sedimentation. Besides, the flocculant can be applied to the slime water treatment process, and can effectively reduce the consumption of water resources, so that the cost of enterprises is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a flocculant composition, a flocculant and a preparation method thereof. Background Art

[0002] Coal slime water contains a large amount of suspended matter. Production practice shows that in addition to coal ash, coal slime water is mainly composed of fine-grained clay minerals (such as kaolinite, illite, etc.). At the same time, some flotation agents (such as dispersants, collectors, etc.) remain in the tailings slurry, resulting in extremely poor sedimentation performance of coal slime water and high turbidity of return water, making it difficult to recycle. This not only causes environmental pollution, but also causes a large amount of water resources to be wasted. In recent years, in response to the problem of difficult sedimentation of coal slime water, many polymer flocculation processes have been studied and explored, including research on different types of flocculants, coagulants and flocculants coagulation and magnetic flocculation, but the above processes cannot achieve ideal results, especially for colloidal clay particles (<1μm) in tailings, which are difficult to effectively flocculate.

[0003] For coal sludge water containing a large amount of clay minerals, since the area of ​​the solid-liquid interface of the suspended particles is very large, directly adding a polymer flocculant (polymer) can produce a certain degree of flocculation, but the use of flocculants at this time not only requires a large amount of flocculants but also has a poor destabilization effect. In addition, since clay minerals such as kaolinite and illite belong to layered silicates, they have a special lamellar structure, and their surface charge is uneven and the hydration effect is strong, there is often a strong electrostatic repulsion and hydration repulsion between the particles of clay minerals in the slurry environment. The electrical neutralization effect (or squeezed double layer effect) of inorganic coagulants (such as calcium chloride, magnesium chloride and polyaluminium chloride, etc.) is also unable to achieve effective destabilization of clay colloid particles. Therefore, at present, neither polymer flocculants nor inorganic coagulants can effectively solve the problems of high turbidity and low sedimentation rate of tailings return water in coal sludge water flocculation sedimentation. Summary of the invention

[0004] The main purpose of the present invention is to provide a flocculant composition, a flocculant and a preparation method thereof, so as to solve the problems of high turbidity and low sedimentation rate of tailings return water in the flocculation and sedimentation of coal sludge water in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, a flocculant composition is provided, which comprises, by mass percentage, 50-75% polyacrylamide, 20-45% cationic surfactant and 1-10% coagulant aid.

[0006] Furthermore, the mass content of the cationic surfactant is 20-40%.

[0007] Furthermore, the mass ratio of polyacrylamide, cationic surfactant and coagulant aid is selected from any one or more of 69:30:1, 57:35:8, 75:20:5, 73:25:2 and 50:40:10.

[0008] Furthermore, the molecular weight of the polyacrylamide is 5 to 15 million, preferably 5 to 10 million.

[0009] Furthermore, the structure of the cationic surfactant is shown in Formula I, H2N-R (Formula I), wherein R is a substituted or unsubstituted C1~C 18 Preferably, R is a substituted or unsubstituted C2-C 12 When R has a substituent, the substituent is selected from any one or more of a C1-C5 alkyl group, a C1-C5 unsaturated hydrocarbon group and a C3-C5 cycloalkyl group.

[0010] Furthermore, the cationic surfactant is selected from any one or more of ethylamine, butylamine and dodecylamine.

[0011] Furthermore, the cationic surfactant is a mixture of butylamine and dodecylamine, wherein the mass ratio of butylamine to dodecylamine in the mixture is 2-5:7-9.

[0012] Furthermore, the coagulant aid is cationic cellulose.

[0013] Furthermore, the molecular weight of the cationic cellulose is 3 to 20 million, preferably 3 to 7 million.

[0014] According to another aspect of the present invention, there is provided a flocculant obtained by mixing a flocculant composition, wherein the flocculant composition is the above-mentioned flocculant composition.

[0015] By applying the technical solution of the present invention, the flocculant composition of the present application adds a cationic surfactant, which can not only strengthen the interaction between the flocculant composition and the mineral, thereby improving the flocculation effect of the tailings while reducing the dosage of the flocculant composition, but also reduce the electrical properties of the surface of fine-grained clay minerals and increase the hydrophobicity of the surface of fine-grained minerals, thereby promoting the flocculation of fine-grained clay minerals, and then reduce the turbidity of the tailings return water and increase the sedimentation rate in the flocculation and sedimentation of coal sludge water. Adding polyacrylamide to the flocculant composition can strengthen flocculation and precipitation, thereby accelerating particle sedimentation; adding a coagulant can improve the flocculation conditions, thereby assisting the flocculant to better play a flocculation role in the flocculation and sedimentation of coal sludge water. In addition, the flocculant of the present invention can not only be used in the process of coal sludge water treatment through the synergistic effect of polyacrylamide, cationic surfactant and coagulant, but also effectively reduce the consumption of water resources, thereby saving the cost of the enterprise.

[0016] Specific implementation methods

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0018] As analyzed in the background technology of this application, the prior art has problems such as high turbidity and low sedimentation rate of tailings return water in coal sludge water flocculation sedimentation. In order to solve the above problems, this application provides a flocculant composition, a flocculant and a preparation method thereof.

[0019] In a typical embodiment of the present application, a flocculant composition is provided, which comprises, by mass percentage, 50-75% of polyacrylamide, 20-45% of cationic surfactant and 1-10% of coagulant aid.

[0020] The flocculant composition of the present application adds a cationic surfactant, which can not only strengthen the interaction between the flocculant composition and the mineral, thereby improving the flocculation effect of the tailings while reducing the dosage of the flocculant composition, but also reduce the electrical properties of the surface of fine-grained clay minerals and increase the hydrophobicity of the surface of fine-grained minerals, thereby promoting the flocculation of fine-grained clay minerals, and then reduce the turbidity of the tailings return water and increase the sedimentation rate in the flocculation and sedimentation of coal sludge water. Adding polyacrylamide to the flocculant composition can strengthen flocculation and precipitation, thereby accelerating particle sedimentation; adding a coagulant can improve the flocculation conditions, thereby assisting the flocculant to better play a flocculation role in the flocculation and sedimentation of coal sludge water. In addition, the flocculant of the present invention can not only be used in the process of coal sludge water treatment through the synergistic effect of polyacrylamide, cationic surfactants and coagulants, but also effectively reduce the consumption of water resources, thereby saving the cost of the enterprise.

[0021] In one embodiment of the present application, the mass content of the cationic surfactant is 20-40%.

[0022] Preferably, the mass content of the cationic surfactant is controlled within the above range, which helps to improve the coordination effect of the cationic surfactant and the other components in the flocculant composition, thereby helping to reduce the turbidity of the tailings backwater and increase the sedimentation rate in the flocculation and sedimentation of coal sludge water. Adding the cationic surfactant in the mass content of the above range to the flocculant composition not only helps to further strengthen the interaction between the flocculant composition and the mineral, thereby helping to further improve the flocculation effect of the tailings while reducing the amount of the flocculant composition, but also helps to further reduce the electrical properties of the surface of the fine-grained clay mineral and increase the hydrophobicity of the surface of the fine-grained mineral, thereby helping to further promote the flocculation of the fine-grained clay mineral, and then help to further reduce the turbidity of the tailings backwater and increase the sedimentation rate in the flocculation and sedimentation of coal sludge water.

[0023] In one embodiment of the present application, the mass ratio of polyacrylamide, cationic surfactant and coagulant aid is selected from any one or more of 69:30:1, 57:35:8, 75:20:5, 73:25:2 and 50:40:10.

[0024] It is preferred to control the mass ratio of polyacrylamide, cationic surfactant and coagulant within the above range, which helps to further improve the coordination effect between the components in the flocculant composition, thereby improving the flocculation effect of the flocculant composition. It is preferred to control the addition of the cationic surfactant in the above range of mass ratio, which not only helps to further strengthen the interaction between the flocculant composition and the mineral, thereby improving the flocculation effect of the tailings while reducing the amount of the flocculant composition, but also helps to further reduce the electrical properties of the surface of fine clay minerals and increase the hydrophobicity of the surface of fine minerals, thereby helping to further promote the flocculation of fine clay minerals, and then help to further reduce the turbidity of the tailings backwater and increase the sedimentation rate in the flocculation and sedimentation of coal sludge water. It is preferred to control the addition of polyacrylamide in the above range of mass ratio, which helps to further strengthen flocculation and precipitation, thereby helping to further accelerate particle sedimentation. It is preferred to control the addition of the coagulant in the above range of mass ratio, which helps to further improve the flocculation conditions, thereby helping to further assist the flocculant in better playing the flocculation role in the flocculation and sedimentation of coal sludge water. Therefore, it is preferred to control the mass ratio of polyacrylamide, cationic surfactant and coagulant aid within the above range, which will help to further enhance the synergistic effect of polyacrylamide, cationic surfactant and coagulant aid, not only help their application in coal slime water treatment process, but also help to further effectively reduce the consumption of water resources, thereby helping to further save enterprise costs.

[0025] In one embodiment of the present application, the molecular weight of polyacrylamide is 5 to 15 million, preferably 5 to 10 million.

[0026] Preferably, the molecular weight of polyacrylamide is controlled within the above range, which helps to improve the interaction between polyacrylamide and minerals, thereby forming larger flocs, which in turn helps to improve the flocculation effect of the flocculant. In addition, adding polyacrylamide with the above molecular weight to the flocculant composition helps to further strengthen flocculation and precipitation, thereby helping to further accelerate particle sedimentation, which in turn helps to further improve the flocculation effect of the flocculant.

[0027] In one embodiment of the present application, the structure of the cationic surfactant is as shown in Formula I, H2N-R (Formula I), wherein R is a substituted or unsubstituted C1~C 18 Preferably, R is a substituted or unsubstituted C2-C 12When R has a substituent, the substituent is selected from any one or more of a C1-C5 alkyl group, a C1-C5 unsaturated hydrocarbon group and a C3-C5 cycloalkyl group.

[0028] The cationic surfactant of the structure shown in Formula I is preferred, which helps to reduce the surface electrical properties of fine clay minerals and increase the hydrophobicity of the surface of fine clay minerals, thereby promoting the flocculation process of fine clay minerals, thereby helping to reduce the turbidity of tailings return water and increase the sedimentation rate. 12 The alkyl group of R is helpful to further reduce the electrical properties of the surface of fine clay minerals and increase the hydrophobicity of the surface of fine minerals, thereby helping to promote the flocculation process of fine clay minerals, thereby helping to reduce the turbidity of tailings backwater and increase the sedimentation rate. Preferably, when R has a substituent, the substituent is within the above range, which helps to further reduce the electrical properties of the surface of fine clay minerals and increase the hydrophobicity of the surface of fine minerals, thereby helping to promote the flocculation process of fine clay minerals, thereby helping to reduce the turbidity of tailings backwater and increase the sedimentation rate.

[0029] In one embodiment of the present application, the cationic surfactant is selected from any one or more of ethylamine, butylamine and dodecylamine; preferably, the cationic surfactant is a mixture of butylamine and dodecylamine, wherein the mass ratio of butylamine to dodecylamine is 2-5:7-9.

[0030] Controlling the type of cationic surfactant within the above range helps to strengthen the interaction between the flocculant composition and the mineral, thereby improving the flocculation effect of the tailings, reducing the turbidity of the tailings return water, and increasing the sedimentation rate, thereby improving the effect of the flocculant composition; preferably, the cationic surfactant is a mixture of butylamine and dodecylamine and controlling the mass ratio of butylamine to dodecylamine within the above range helps to more fully reduce the electrical properties of the surface of fine-grained clay minerals through the mutual coordination of alkylamine cationic surfactants with alkyl chains of different lengths, thereby further strengthening the interaction between the flocculant composition and the mineral, further improving the flocculation effect of the tailings while reducing the amount of flocculant used, and helping to further reduce the turbidity of the tailings return water and further increase the sedimentation rate.

[0031] In one embodiment of the present application, the coagulant aid is cationic cellulose; the molecular weight of the cationic cellulose is 3 million to 20 million, preferably 3 million to 7 million.

[0032] The type and molecular weight of the coagulant aid are preferably within the above range, which helps to improve the synergistic effect between the coagulant aid and polyacrylamide and cationic surfactant, and in particular further improves the coordination between polyacrylamide and cationic cellulose, thereby helping the flocculant composition to more fully exert the flocculation effect in the flocculation and sedimentation of coal slime water. In addition, the addition of the above coagulant aid helps to further improve the flocculation conditions, thereby better assisting the flocculant to further exert the flocculation effect in the flocculation and sedimentation of coal slime water.

[0033] In a typical embodiment of the present application, a flocculant is provided, which is obtained by mixing a flocculant composition, and the flocculant composition is the above-mentioned flocculant composition.

[0034] The flocculant of the present invention can not only reduce the turbidity of tailings backwater and increase the sedimentation rate in the flocculation and sedimentation of coal slime water through the synergistic effect of polyacrylamide, cationic surfactant and coagulant, but also can be better applied to the process of coal slime water treatment, effectively reduce the consumption of water resources, and thus save the cost of the enterprise. The cationic surfactant in the flocculant can not only strengthen the interaction between the flocculant composition and the mineral, thereby improving the flocculation effect of the tailings while reducing the dosage of the flocculant composition, but also reduce the electrical properties of the surface of fine clay minerals and increase the hydrophobicity of the surface of fine minerals, thereby promoting the flocculation of fine clay minerals, and then can reduce the turbidity of tailings backwater and increase the sedimentation rate in the flocculation and sedimentation of coal slime water. The polyacrylamide in the flocculant can strengthen flocculation and precipitation, thereby accelerating particle sedimentation; the coagulant in the flocculant can improve the flocculation conditions, thereby assisting the flocculant to better play a flocculation role in the flocculation and sedimentation of coal slime water, and then better applied to the process of coal slime water treatment, which helps to further effectively reduce the consumption of water resources, thereby further saving the cost of the enterprise.

[0035] The beneficial effects of the present application will be further illustrated below in conjunction with embodiments.

[0036] Example 1

[0037] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant dodecylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant is 3 million.

[0038] Example 2

[0039] The difference from Example 1 is that in the flocculant composition, the mass ratio of polyacrylamide, cationic surfactant dodecylamine and coagulant cationic cellulose is 73:25:8, and the flocculant composition is physically mixed and stirred to obtain a flocculant, wherein the molecular weight of polyacrylamide is 5 million, and the molecular weight of the coagulant cationic cellulose is 3 million.

[0040] Example 3

[0041] The difference from Example 1 is that in the flocculant composition, the mass ratio of polyacrylamide, cationic surfactant ethylamine and coagulant cationic cellulose is 75:20:5, and the flocculant composition is mixed and stirred to obtain a flocculant, wherein the molecular weight of polyacrylamide is 5 million, and the molecular weight of the coagulant cationic cellulose is 3 million.

[0042] Example 4

[0043] The difference from Example 1 is that in the flocculant composition, the mass ratio of polyacrylamide, cationic surfactant butylamine and coagulant cationic cellulose is 57:35:8, and the flocculant composition is mixed and stirred to obtain a flocculant, wherein the molecular weight of polyacrylamide is 5 million, and the molecular weight of the coagulant cationic cellulose is 3 million.

[0044] Example 5

[0045] The difference from Example 1 is that in the flocculant composition, the mass ratio of polyacrylamide, cationic surfactant butylamine and coagulant cationic cellulose is 50:40:10, and the flocculant composition is mixed and stirred to obtain a flocculant, wherein the molecular weight of polyacrylamide is 5 million, and the molecular weight of the coagulant cationic cellulose is 3 million.

[0046] Example 6

[0047] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant dodecylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 15 million, and the molecular weight of the cationic cellulose as a coagulant is 3 million.

[0048] Example 7

[0049] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant dodecylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 10 million, and the molecular weight of the cationic cellulose as a coagulant is 3 million.

[0050] Example 8

[0051] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant dodecylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 4 million, and the molecular weight of the cationic cellulose as a coagulant is 3 million.

[0052] Example 9

[0053] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant butylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant is 3 million.

[0054] Example 10

[0055] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant methylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant is 3 million.

[0056] Embodiment 11

[0057] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant methylamine and 1% cationic cellulose as a coagulant aid is used as raw materials, and the flocculant is obtained after physical mixing and stirring, wherein the cationic surfactant is a mixture of butylamine and dodecylamine, and the mass ratio of butylamine to dodecylamine is 2:7, the molecular weight of polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant aid is 3 million.

[0058] Example 12

[0059] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant methylamine and 1% cationic cellulose as a coagulant aid is used as raw materials, and the flocculant is obtained after physical mixing and stirring, wherein the cationic surfactant is a mixture of butylamine and dodecylamine, and the mass ratio of butylamine to dodecylamine is 5:9, the molecular weight of polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant aid is 3 million.

[0060] Example 13

[0061] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant methylamine and 1% cationic cellulose as a coagulant aid is used as raw materials, and the flocculant is obtained after physical mixing and stirring, wherein the cationic surfactant is a mixture of butylamine and dodecylamine, and the mass ratio of butylamine to dodecylamine is 6:7, the molecular weight of polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant aid is 3 million.

[0062] Embodiment 14

[0063] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant dodecylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant is 20 million.

[0064] Embodiment 15

[0065] In terms of mass percentage, a flocculant composition of 69% polyacrylamide, 30% cationic surfactant dodecylamine and 1% cationic cellulose as a coagulant is used as raw materials, and a flocculant is obtained after physical mixing and stirring, wherein the molecular weight of the polyacrylamide is 5 million, and the molecular weight of the cationic cellulose as a coagulant is 2 million.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that the flocculant composition only includes polyacrylamide, that is, the mass content of polyacrylamide is 100%, and the flocculant is obtained after physical mixing and stirring, wherein the molecular weight of polyacrylamide is 5 million.

[0068] Comparative Example 2

[0069] The difference from Example 1 is that the flocculant composition only includes polyacrylamide and cationic surfactant butylamine, and the mass ratio of polyacrylamide to cationic surfactant butylamine is 4:6, and the flocculant is obtained after physical mixing and stirring.

[0070] Comparative Example 3

[0071] The difference from Example 1 is that the flocculant composition only includes polyacrylamide and cationic cellulose as a coagulant aid, and the mass ratio of polyacrylamide to cationic cellulose as a coagulant aid is 95:5, and the flocculant is obtained after physical mixing and stirring.

[0072] Comparative Example 4

[0073] The difference from Example 1 is that the flocculant composition only includes the cationic surfactant butylamine and the coagulant cationic cellulose, and the mass ratio of the cationic surfactant butylamine to the coagulant cationic cellulose is 95:5, and the flocculant is obtained after physical mixing and stirring.

[0074] Test Method

[0075] The fine-grained high-clay coal sludge water of the Gongwusu Coal Preparation Plant in Inner Mongolia was used as the test object, wherein the solid particles with a particle size of less than 38 μm in the coal sludge water accounted for more than 90%. The flocculants of the embodiments and comparative examples were used to treat the coal sludge water, and the amount of flocculants used was 20 g / t. The test results of turbidity and suspended matter before and after the treatment of the coal sludge water are shown in Table 1.

[0076] Table 1

[0077]

[0078]

[0079] It can be seen from Table 1 that the flocculant in the above embodiments of the present application has a significantly better effect on the treatment of coal slime water than the flocculant in the comparative example. Therefore, the flocculant of the present application can not only be used in the coal slime water treatment process through the synergistic effect of polyacrylamide, cationic surfactant and coagulant, but also can effectively reduce the consumption of water resources, thereby saving the cost of the enterprise.

[0080] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0081] The flocculant composition of the present application adds a cationic surfactant, which can not only strengthen the interaction between the flocculant composition and the mineral, thereby improving the flocculation effect of the tailings while reducing the dosage of the flocculant composition, but also reduce the electrical properties of the surface of fine-grained clay minerals and increase the hydrophobicity of the surface of fine-grained minerals, thereby promoting the flocculation of fine-grained clay minerals, and then reduce the turbidity of the tailings return water and increase the sedimentation rate in the flocculation and sedimentation of coal sludge water. Adding polyacrylamide to the flocculant composition can strengthen flocculation and precipitation, thereby accelerating particle sedimentation; adding a coagulant can improve the flocculation conditions, thereby assisting the flocculant to better play a flocculation role in the flocculation and sedimentation of coal sludge water. In addition, the flocculant of the present invention can not only be used in the process of coal sludge water treatment through the synergistic effect of polyacrylamide, cationic surfactants and coagulants, but also effectively reduce the consumption of water resources, thereby saving the cost of the enterprise.

[0082] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flocculant composition, characterized in that: In terms of mass percentage, the flocculant composition comprises: 50-75% polyacrylamide; 20-45% of a cationic surfactant; and 1~10% coagulant aid.

2. The flocculant composition according to claim 1, characterized in that The mass content of the cationic surfactant is 20-40%.

3. The flocculant composition according to claim 1 or 2, characterized in that: The mass ratio of the polyacrylamide, the cationic surfactant and the coagulant aid is selected from any one or more of 69:30:1, 57:35:8, 75:20:5, 73:25:2 and 50:40:

10.

4. The flocculant composition according to any one of claims 1 to 3, characterized in that The molecular weight of the polyacrylamide is 5 to 15 million, preferably 5 to 10 million.

5. The flocculant composition according to any one of claims 1 to 4, characterized in that The structure of the cationic surfactant is shown in Formula I, H,NR (Formula I) Wherein, R is a substituted or unsubstituted C1~C 18 Preferably, R is a substituted or unsubstituted C2 to C 12 When the R has a substituent, the substituent is selected from any one or more of a C1-C5 alkyl group, a C1-C5 unsaturated hydrocarbon group and a C3-C5 cycloalkyl group.

6. The flocculant composition according to claim 5, characterized in that: The cationic surfactant is selected from any one or more of ethylamine, butylamine and dodecylamine.

7. The flocculant composition according to claim 6, characterized in that: The cationic surfactant is a mixture of the butylamine and the dodecylamine, wherein the mass ratio of the butylamine to the dodecylamine in the mixture is 2-5:7-9.

8. The flocculant composition according to any one of claims 1 to 7, characterized in that The coagulant aid is cationic cellulose.

9. The flocculant composition according to claim 8, characterized in that: The molecular weight of the cationic cellulose is 3 to 20 million, preferably 3 to 7 million.

10. A flocculant obtained by mixing a flocculant composition, characterized in that: The flocculant composition is the flocculant composition according to any one of claims 1 to 9.

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