Flocculation and sedimentation method for improving the sedimentation effect of titanium sulfate process titanium white titanium liquid

Abstract

The application provides application of high-molecular-weight cationic polyacrylamide in titanium liquid sedimentation process in a sulfuric acid method titanium white process; the number average molecular weight of the high-molecular-weight cationic polyacrylamide is greater than or equal to 10 million.The application also provides a flocculation sedimentation method for improving the titanium liquid sedimentation effect in the sulfuric acid method titanium white process.The application applies cationic polyacrylamide to the titanium liquid sedimentation process in the sulfuric acid method titanium white, and the flocculant preparation time can be shortened by more than half compared with the previous time.In the flocculation process, the high cationic degree makes the ion concentration of the dissociated ions higher, the adsorption effect of the charges stronger, especially the adsorption effect on the silicic acid component contained in the titanium liquid stronger, so that the flocculation sedimentation process is carried out more quickly and completely.The application adopts emulsion-type high-ionic-strength high-molecular-weight cationic polyacrylamide, compared with the traditional flocculant product, can effectively improve the titanium liquid flocculation sedimentation effect in the sulfuric acid method titanium white, and comprehensively reduce the production cost.

Description

Technical Field

[0001] This invention belongs to the field of titanium liquid sedimentation technology in the sulfuric acid process for titanium dioxide production, and relates to the application of high molecular weight cationic polyacrylamide in the sedimentation process of titanium liquid in the sulfuric acid process for titanium dioxide production, as well as a flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production, and particularly relates to a flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production. Background Technology

[0002] The flocculants used in the sedimentation process of sulfuric acid titanium dioxide have evolved over the years, from inorganic flocculants to mixed flocculants and organic flocculants. Currently, most sulfuric acid titanium dioxide manufacturers use polyacrylamide as the main flocculant, but in specific product selection, low molecular weight polyacrylamide granules are often chosen. The advantages of this product are low cost, easy procurement, and good sedimentation effect. However, it also has disadvantages such as easy moisture absorption, poor resistance to sunlight, slow dissolution rate, and short storage time after preparation. More importantly, when a large amount is added to the sedimentation of sulfuric acid titanium dioxide, it can easily cause the viscosity of the titanium liquid to increase, reducing the sedimentation effect. When industrial technical problems such as difficulty in titanium liquid flocculation and sedimentation occur, they are not easy to deal with.

[0003] Therefore, finding a more suitable method for the sedimentation of titanium dioxide solution using the sulfuric acid process, further refining and upgrading the flocculant selection for titanium solution sedimentation, and solving the aforementioned technical problems in the existing process have become one of the urgent problems to be solved by many front-line researchers in the industry. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide the application of high molecular weight cationic polyacrylamide in the titanium liquid sedimentation process of the sulfuric acid process and a flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process, particularly a flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process. The present invention uses emulsion-type high-ionicity, high molecular weight cationic polyacrylamide for the titanium liquid sedimentation process in the acid process. Compared with traditional flocculant products, it can effectively improve the flocculation sedimentation effect of titanium liquid in the sulfuric acid process, and comprehensively reduce production costs; moreover, the process is simple, has good controllability, and is highly operable, making it more suitable for industrial promotion and application.

[0005] This invention provides the application of high molecular weight cationic polyacrylamide in the titanium liquid sedimentation process of the sulfuric acid process for titanium dioxide production;

[0006] The high molecular weight cationic polyacrylamide has a number average molecular weight greater than or equal to 10 million.

[0007] Preferably, the high molecular weight cationic polyacrylamide is a high ionicity high molecular weight cationic polyacrylamide;

[0008] The high ionicity high molecular weight cationic polyacrylamide has a cationicity greater than or equal to 50%.

[0009] The polyacrylamide includes polyacrylamide emulsion.

[0010] Preferably, the application is specifically as a flocculant;

[0011] The mass concentration of the flocculant is 1‰ to 1.5‰;

[0012] The volume of the flocculant added is 3% to 8% of the volume of the titanium liquid.

[0013] Preferably, the high molecular weight cationic polyacrylamide has a molecular weight of 10 million to 15 million.

[0014] The high molecular weight cationic polyacrylamide has a cationic degree of 50% to 60%.

[0015] Preferably, the titanium liquid, based on elemental concentration, comprises: TiO2: 110–130 g / L, Ti 3+ : 1~1.5g / L, Fe: 40~45g / L, Mg: 4~6g / L, Si: 0~1g / L, Al: 0~2g / L, Ca: 0~2g / L.

[0016] This invention provides a flocculation and sedimentation method for improving the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production, comprising the following steps:

[0017] 1) A flocculant is obtained by mixing cationic polyacrylamide emulsion and water;

[0018] 2) Add the flocculant obtained in the above steps to the titanium liquid produced by the sulfuric acid process for titanium dioxide production, and after standing and settling, obtain the settled titanium liquid.

[0019] Preferably, the high molecular weight cationic polyacrylamide has a molecular weight greater than or equal to 10 million;

[0020] The high ionicity high molecular weight cationic polyacrylamide has a cationicity greater than or equal to 50%.

[0021] The mass concentration of the flocculant is 1‰ to 1.5‰.

[0022] Preferably, the mixing time is 10 to 30 minutes;

[0023] The total titanium concentration of the titanium liquid is 100-130 g / L;

[0024] The viscosity of the titanium liquid is 10–15 mPa·s.

[0025] Preferably, the specific gravity of the titanium liquid is 1.3 to 1.5;

[0026] The F value of the titanium liquid is 1.8 to 1.9;

[0027] The stability of the titanium liquid is 400-500 ml.

[0028] Preferably, the solid content of the titanium liquid is 14-16 g / L;

[0029] The settling time is 1 to 6 hours;

[0030] The settling process further includes a separation step.

[0031] The solid content of the titanium liquid after sedimentation is 0 to 0.2 g / L.

[0032] This invention provides the application of high molecular weight cationic polyacrylamide in the sedimentation process of titanium liquor in the sulfuric acid process for titanium dioxide production; the high molecular weight cationic polyacrylamide has a number average molecular weight greater than or equal to 10 million. Compared with existing technologies, polyacrylamide is classified into four categories according to differences in ionic properties: anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, and amphoteric polyacrylamide. Cationic polyacrylamide is generally considered to be commonly used for the purification of organic sludge or strongly alkaline sludge. The cationicity of the finished cationic polyacrylamide is an important criterion for judging its decontamination ability. Cationic polyacrylamide is a high molecular polymer formed by the copolymerization of acrylamide and cationic monomers. Its molecular chain has numerous cationic groups, which react with negatively charged colloidal particles in wastewater and sludge through charge neutralization, adsorption bridging, and entrapment sweeping, causing coagulation and flocculation to form precipitates, thus removing pollutants from the water. This invention suggests that concentrated titanium liquor contains a large amount of unreacted acid hydrolysis residue and other impurities, requiring the addition of flocculants followed by static sedimentation for removal. The use of cationic polyacrylamide in the sedimentation process of titanium liquor in the sulfuric acid process for titanium dioxide production yields the best results.

[0033] Based on this, this invention creatively utilizes a specific high molecular weight cationic polyacrylamide as a flocculant in the titanium liquid sedimentation process of the sulfuric acid process for titanium dioxide production, and provides a corresponding flocculation and sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production. This invention uses cationic polyacrylamide in the titanium liquid sedimentation process of the sulfuric acid process, which can shorten the flocculant preparation time by more than half compared to previous methods. During the flocculation process, the high cationicity results in a higher concentration of dissociated ions, stronger adsorption of charges, especially a strong adsorption effect on the silicic acid components contained in the titanium liquid, making the flocculation and sedimentation process faster and more thorough. This invention uses emulsion-type high ionicity, high molecular weight cationic polyacrylamide, which, compared to traditional flocculant products, can effectively improve the flocculation and sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production, and comprehensively reduce production costs.

[0034] This invention is applicable to the flocculation and sedimentation process of titanium dioxide produced using the sulfuric acid process. It employs a high-ionicity, high-molecular-weight cationic polyacrylamide flocculant, added to the titanium solution in a specific ratio. After thorough mixing and settling, the solution is allowed to settle. When sufficient settling time has elapsed, the titanium solution separates into layers, with the upper clear layer being the desired titanium solution product. Compared to traditional flocculants, using the same amount of conventional flocculant for the same titanium solution, this invention can increase the pumping speed of the titanium solution by approximately 30%, effectively reducing process problems related to unsatisfactory sedimentation. Furthermore, this method significantly improves the quality of the titanium solution without adversely affecting product quality. On-site equipment modification is simple and easy to implement, allowing for widespread adoption by sulfuric acid process titanium dioxide enterprises with relevant needs, thus contributing to cost reduction and efficiency improvement. Detailed Implementation

[0035] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and not for limiting the claims of the present invention.

[0036] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0037] The purity of all raw materials used in this invention is not particularly limited. However, it is preferable to use industrially pure or conventionally pure flocculants used in the titanium liquid sedimentation process of the sulfuric acid method for titanium dioxide production.

[0038] All raw materials of this invention are conventional in the field, and each brand name and abbreviation is clear and distinct in its relevant application. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand name, abbreviation and corresponding application.

[0039] This invention provides the application of high molecular weight cationic polyacrylamide in the titanium liquid sedimentation process of the sulfuric acid process for titanium dioxide production;

[0040] The high molecular weight cationic polyacrylamide has a number average molecular weight greater than or equal to 10 million. Specifically, the high molecular weight cationic polyacrylamide emulsion has a cationicity of over 50% and a molecular weight exceeding 12 million. It has the advantages of low apparent viscosity, fast dissolution rate, good flocculation effect, and long storage time. Furthermore, its high content of effective ingredients can reduce the amount added during use, thus comprehensively improving economic benefits.

[0041] In this invention, the high molecular weight cationic polyacrylamide is preferably a high ionicity high molecular weight cationic polyacrylamide.

[0042] In this invention, the cationic ionization degree of the high-ionicity high molecular weight cationic polyacrylamide is preferably greater than or equal to 50%, more preferably greater than or equal to 52%, and even more preferably greater than or equal to 53%.

[0043] In this invention, the polyacrylamide preferably comprises a polyacrylamide emulsion.

[0044] In this invention, the application is preferably as a flocculant.

[0045] In this invention, the mass concentration of the flocculant is preferably 1‰ to 1.5‰, more preferably 1.1‰ to 1.4‰, and even more preferably 1.2‰ to 1.3‰.

[0046] In this invention, the volume of the flocculant added is preferably 3% to 8% of the volume of the titanium liquid, more preferably 4% to 7%, and even more preferably 5% to 6%.

[0047] In this invention, the molecular weight of the high molecular weight cationic polyacrylamide is preferably 10 million to 15 million, more preferably 11 million to 14 million, and even more preferably 12 million to 13 million.

[0048] In this invention, the cationic degree of the high molecular weight cationic polyacrylamide is preferably 50% to 60%, more preferably 52% to 58%, and even more preferably 54% to 56%.

[0049] In this invention, the titanium liquid preferably comprises, by elemental concentration: TiO2: 110-130 g / L, Ti 3+ : 1~1.5g / L, Fe: 40~45g / L, Mg: 4~6g / L, Si: 0~1g / L, Al: 0~2g / L, Ca: 0~2g / L, more preferably TiO2: 114~126g / L, Ti 3+ : 1.1~1.4g / L, Fe: 41~44g / L, Mg: 4.4~5.6g / L, Si: 0.2~0.8g / L, Al: 0.4~1.6g / L, Ca: 0.4~1.6g / L, more preferably TiO2: 118~122g / L, Ti 3+ : 1.2~1.3g / L, Fe: 42~43g / L, Mg: 4.8~5.2g / L, Si: 0.4~0.6g / L, Al: 0.8~1.2g / L, Ca: 0.8~1.2g / L.

[0050] This invention provides a flocculation and sedimentation method for improving the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production, comprising the following steps:

[0051] 1) A flocculant is obtained by mixing cationic polyacrylamide emulsion and water;

[0052] 2) Add the flocculant obtained in the above steps to the titanium liquid produced by the sulfuric acid process for titanium dioxide production, and after standing and settling, obtain the settled titanium liquid.

[0053] The present invention first mixes cationic polyacrylamide emulsion and water to obtain a flocculant.

[0054] In this invention, the molecular weight of the high molecular weight cationic polyacrylamide is preferably greater than or equal to 10 million, more preferably greater than or equal to 11 million, and even more preferably greater than or equal to 12 million.

[0055] In this invention, the cationic ionization degree of the high-ionic-degree high-molecular-weight cationic polyacrylamide is preferably greater than or equal to 50%, more preferably greater than or equal to 52%, and even more preferably greater than or equal to 54%.

[0056] In this invention, the mass concentration of the flocculant is preferably 1‰ to 1.5‰, more preferably 1.1‰ to 1.4‰, and even more preferably 1.2‰ to 1.3‰.

[0057] In this invention, the mixing time is preferably 10 to 30 minutes, more preferably 14 to 26 minutes, and even more preferably 18 to 22 minutes.

[0058] Finally, the flocculant obtained in the above steps is added to the titanium liquid produced by the sulfuric acid process for titanium dioxide production. After standing and settling, the settled titanium liquid is obtained.

[0059] In this invention, the total titanium concentration of the titanium liquid is preferably 100-130 g / L, more preferably 105-125 g / L, and even more preferably 110-120 g / L.

[0060] In this invention, the viscosity of the titanium liquid is preferably 10-15 mPa·s, more preferably 11-14 mPa·s, even more preferably 12-13 mPa·s, and can be 12.58 mPa·s.

[0061] In this invention, the specific gravity of the titanium liquid is preferably 1.3 to 1.5, more preferably 1.34 to 1.46, even more preferably 1.38 to 1.43, and specifically 1.43.

[0062] In this invention, the F value of the titanium liquid is preferably 1.8 to 1.9, more preferably 1.81 to 1.86, even more preferably 1.81 to 1.82, and specifically 1.81.

[0063] In this invention, the stability of the titanium liquid is preferably 400-500 ml, more preferably 420-480 ml, even more preferably 440-460 ml, and specifically 430 ml.

[0064] In this invention, the solid content of the titanium liquid is preferably 14-16 g / L, more preferably 14.4-15.6 g / L, even more preferably 14.8-15.2 g / L, and specifically 14.99 g / L.

[0065] In this invention, the settling time is preferably 1 to 6 hours, more preferably 2 to 5 hours, and even more preferably 3 to 4 hours.

[0066] In this invention, the settling process preferably includes a separation step.

[0067] In this invention, the solid content of the titanium liquid after sedimentation is preferably 0 to 0.2 g / L, more preferably 0.04 to 0.16 g / L, and even more preferably 0.08 to 0.12 g / L.

[0068] To complete and refine the overall technical solution and better improve the sedimentation effect of titanium liquid, the above-mentioned flocculation sedimentation method for improving the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production may specifically include the following steps:

[0069] The design scheme is as follows:

[0070] 1) Select emulsion-type polyacrylamide stock solution (molecular weight > 10 million, cationic degree > 50%) and add appropriate amount of water to prepare flocculant. The concentration is 1-1.5‰, and the stirring time is 10-30 minutes.

[0071] 2) Add 3% to 8% of the prepared flocculant to the titanium liquid (total titanium concentration 100-130 g / L), mix thoroughly, and let it stand to settle.

[0072] 3) After settling for a period of time, take the overflow supernatant to test the pumping speed and solid content. If it is qualified, it is the titanium liquid product after settling is complete.

[0073] Concentrated titanium solution contains a large amount of unreacted acid hydrolysis residue and other impurities, which need to be removed by adding flocculants and allowing the solution to settle. This invention uses cationic polyacrylamide products in the sedimentation process of titanium dioxide produced by the sulfuric acid process. The flocculant preparation time can be shortened by more than half compared to the past. During the flocculation process, the high cationicity results in a higher concentration of ions released from the flocculant, which has a stronger adsorption effect on the charge, especially on the silica components contained in the titanium solution, making the flocculation and sedimentation process faster and more thorough.

[0074] This invention provides the application of high molecular weight cationic polyacrylamide in the titanium liquid sedimentation process of the sulfuric acid process for titanium dioxide production, and a flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process. This invention uses a specific high molecular weight cationic polyacrylamide as a flocculant in the titanium liquid sedimentation process of the sulfuric acid process and provides a corresponding flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process. This invention uses cationic polyacrylamide in the titanium liquid sedimentation process of the sulfuric acid process, which can shorten the flocculant preparation time by more than half compared to the past. During the flocculation process, the high cationicity results in a higher concentration of dissociated ions, stronger adsorption of charges, especially a strong adsorption effect on the silicic acid components contained in the titanium liquid, making the flocculation sedimentation process faster and more thorough. This invention uses emulsion-type high ionicity, high molecular weight cationic polyacrylamide, which, compared with traditional flocculant products, can effectively improve the flocculation sedimentation effect of titanium liquid in the sulfuric acid process and comprehensively reduce production costs.

[0075] This invention is applicable to the flocculation and sedimentation process of titanium dioxide produced using the sulfuric acid process. It employs a high-ionicity, high-molecular-weight cationic polyacrylamide flocculant, added to the titanium solution in a specific ratio. After thorough mixing and settling, the solution is allowed to settle. When sufficient settling time has elapsed, the titanium solution separates into layers, with the upper clear layer being the desired titanium solution product. Compared to traditional flocculants, using the same amount of conventional flocculant for the same titanium solution, this invention can increase the pumping speed of the titanium solution by approximately 30%, effectively reducing process problems related to unsatisfactory sedimentation. Furthermore, this method significantly improves the quality of the titanium solution without adversely affecting product quality. On-site equipment modification is simple and easy to implement, allowing for widespread adoption by sulfuric acid process titanium dioxide enterprises with relevant needs, thus contributing to cost reduction and efficiency improvement.

[0076] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, describes the application of the high molecular weight cationic polyacrylamide provided by the present invention in the titanium liquid sedimentation process of the sulfuric acid process, as well as a flocculation sedimentation method for improving the sedimentation effect of titanium liquid in the sulfuric acid process. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures, only to further illustrate the features and advantages of the present invention, and not to limit the scope of protection of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0077] Example 1

[0078] See Table 1, which shows the physical properties of the titanium liquid used in the embodiments of the present invention.

[0079] Table 1

[0080] Physical properties Viscosity / mPa·s proportion F value Stability / mL Solid content / g / L 12.58 1.43 1.81 430 14.99

[0081] See Table 2, which shows the chemical composition of the titanium liquid used in the embodiments of the present invention.

[0082] Table 2

[0083] element <![CDATA[TiO2]]> <![CDATA[Ti 3+ ]]> Fe Mg Si Al Ca Content in g / L 128 1.24 43.3 5 0.09 0.58 0.29

[0084] Take 100ml of the same titanium liquid, and prepare flocculants of different types and molecular weights at a concentration of 1‰. Add 5ml of flocculant to the titanium liquid for flocculation and sedimentation. After 1 hour, take 2ml of the supernatant to test the solid content, and filter 50ml to record the filtration time. The results are shown in Table 3. Table 3 shows the sedimentation effect of different types of flocculants.

[0085] Table 3

[0086]

[0087] As shown in Table 3, cationic polyacrylamide (CPAM) has better flocculation and sedimentation effects than nonionic polyacrylamide (NPAM) and anionic polyacrylamide (APAM).

[0088] Example 2

[0089] Take 100ml of the same titanium liquid, and prepare flocculants with different cationic degrees to a concentration of 1‰. Add 5ml of flocculant to the titanium liquid for flocculation and sedimentation. After 1 hour, take 2ml of the supernatant to test the solid content, and filter 50ml to record the filtration time. The results are shown in Table 4. Table 4 shows the sedimentation effect of CPAM with different cationic degrees.

[0090] Table 4

[0091] Types of flocculants molecular weight ionicity Filtration time Solid content g / L CPAM 1000 20 4′49″ 1.612 CPAM 1000 40 4′40″ 1.654 CPAM 1000 60 1′46″ 0.432

[0092] As shown in Table 4, the flocculation and sedimentation effect of CPAM with high cationicity is much higher than that of CPAM with low ionicity of the same type.

[0093] Example 3

[0094] The operation method is as described above. Emulsion-type CPAM and solid CPAM are used to prepare the flocculant. Solid CPAM is added to water and stirred using a mechanical stirrer (350 r / min). The preparation is complete after 1 hour. Emulsion-type CPAM is added to water and stirred for 10 minutes to complete the preparation. The sedimentation results are shown in Table 5, which shows the sedimentation effect of CPAMs with different cationic degrees.

[0095] Table 5

[0096] Types of flocculants molecular weight Filtration time Solid content g / L Emulsion-type CPAM 1000 53″ 0.218 Solid CPAM 1000 2′00″ 0.416

[0097] As shown in Table 5, emulsion-type CPAM has a better flocculation effect, and the solid content of the titanium dioxide solution obtained under the same conditions is about half that of the emulsion.

[0098] Example 4

[0099] The operation method is as shown above. The flocculation effect of adding different amounts of emulsion-type CPAM is shown in Table 6. Table 6 shows the sedimentation effect of different amounts of CPAM.

[0100] Table 6

[0101] Types of flocculants Increase Filtration time Solid content g / L CPAM 3％ 1′12″ 0.301 CPAM 5％ 53″ 0.218 CPAM 8％ 50″ 0.189

[0102] As shown in Table 6, the effect is improved with the increase of flocculant dosage. In actual operation, the amount of flocculant added can be selected according to the difficulty of titanium liquid sedimentation. Reducing the dosage can reduce costs or increasing the dosage can improve the effect.

[0103] The application of high molecular weight cationic polyacrylamide provided by this invention in the titanium liquid sedimentation process of the sulfuric acid process for titanium dioxide production, as well as a flocculation sedimentation method for improving the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production, have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention, including the best mode, and also to enable any person skilled in the art to practice this invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. Application of high molecular weight cationic polyacrylamide in the titanium liquid sedimentation process of sulfuric acid process titanium dioxide production; The high molecular weight cationic polyacrylamide has a number average molecular weight of 10 million to 15 million. The high molecular weight cationic polyacrylamide has a cationic degree of 50%~60%; The polyacrylamide includes polyacrylamide emulsion; The titanium liquid, based on elemental concentration, comprises: TiO2:110~130g / L、Ti 3+ :1~1.5g / L、Fe:40~45g / L、Mg:4~6g / L、Si:0~1g / L、Al:0~2g / L、Ca:0~2g / L。 2. The application according to claim 1, characterized in that, The high molecular weight cationic polyacrylamide is specifically a high ionicity high molecular weight cationic polyacrylamide.

3. The application according to claim 1, characterized in that, The specific application is as a flocculant.

4. The application according to claim 3, characterized in that, The mass concentration of the flocculant is 1‰ to 1.5‰.

5. The application according to claim 3, characterized in that, The volume of the flocculant added is 3% to 8% of the volume of the titanium liquid.

6. A flocculation and sedimentation method for improving the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production, characterized in that, Includes the following steps: 1) A flocculant is obtained by mixing cationic polyacrylamide emulsion and water; The number-average molecular weight of the cationic polyacrylamide is 10 million to 15 million. The cationic polyacrylamide has a cationic degree of 50%~60%; 2) Add the flocculant obtained in the above steps to the titanium liquid produced by the sulfuric acid process for titanium dioxide production, and after standing and settling, obtain the settled titanium liquid.

7. The flocculation and sedimentation method according to claim 6, characterized in that, The mass concentration of the flocculant is 1‰ to 1.5‰.

8. The flocculation and sedimentation method according to claim 6, characterized in that, The mixing time is 10-30 minutes; The total titanium concentration of the titanium liquid is 100~130g / L; The viscosity of the titanium liquid is 10~15 mPa·s.

9. The flocculation and sedimentation method according to claim 6, characterized in that, The specific gravity of the titanium liquid is 1.3~1.5; The F value of the titanium liquid is 1.8~1.9; The stability of the titanium liquid is 400~500ml.

10. The flocculation and sedimentation method according to claim 6, characterized in that, The solid content of the titanium liquid is 14~16g / L; The settling time is 1-6 hours; The settling process further includes a separation step. The solid content of the titanium liquid after sedimentation is 0~0.2g / L.

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