Industrial acidolysis titanium solution sedimentation effect pre-judgment method and sedimentation method

Abstract

The invention discloses an industrial acidolysis titanium solution sedimentation effect pre-judgment method and a sedimentation method, and belongs to the technical field of sulfuric acid process titanium dioxide production. In order to solve the problems of poor titaniferous solution purification effect and unstable production control in the prior art, the invention provides a sedimentation effect pre-judgment method and a sedimentation method, and the sedimentation method comprises the following steps: taking an acidolysis titaniferous solution, centrifuging at the rotating speed of 1000-9000 rpm for 2-10 minutes, taking a centrifuged clear solution, testing the turbidity, pre-judging the sedimentation effect according to the corresponding relationship between the turbidity and the adding amount of a flocculating agent solution, and determining the sedimentation effect according to the pre-judgment result. And determining the adding amount of the flocculating agent solution, settling, and filtering to obtain the purified titanium solution. Before the flocculating agent solution is added, the sedimentation effect of the titanium liquid can be rapidly pre-judged, the sedimentation process is optimized in time, it is ensured that the quality of the titanium liquid meets the production process requirement, operation is easy, and industrial production is easy to achieve.

Description

Technical Field

[0001] This invention belongs to the field of sulfuric acid process titanium dioxide production technology, specifically relating to a method for predicting the sedimentation effect of industrial acid hydrolysis titanium liquid and a sedimentation method. Background Technology

[0002] Various impurities in titanium raw materials will partially enter the titanium molten solution during the acidolysis process of the sulfuric acid process. Unreacted impurities will either become residues or remain suspended in the titanium molten solution. Therefore, in order to improve product quality, the titanium molten solution obtained after acidolysis of titanium raw materials needs to be purified when producing titanium dioxide using the sulfuric acid process. Through sedimentation purification, most of the residue will settle to the bottom of the sedimentation tank, while a small portion will remain suspended in the titanium molten solution. These suspended solids mainly include acidolysis residues, silica gel, calcium sulfate, and unreacted titanium raw material particles. The composition and quantity of these suspended solids are closely related to the sedimentation effect of the titanium molten solution.

[0003] Currently, the industrial treatment method involves adding flocculants to molten titanium, allowing it to settle naturally for 1-2 hours, and then filtering to remove solid and colloidal impurities. Good settling results in low solid content in the molten titanium, fast filtration speed, low titanium loss, and high production efficiency. Poor settling not only affects production efficiency and titanium yield but also the quality of the final product. Therefore, molten titanium purification is crucial for the production of high-quality sulfuric acid process titanium dioxide products. The purification effect is mainly evaluated by the time required to filter 100 mL; a time not exceeding 3 minutes is considered acceptable, while a time exceeding 3 minutes indicates poor settling. When difficulties arise in molten titanium purification, attempts are often made to improve the settling effect by extending the settling time or increasing the flocculant dosage in the next batch of molten titanium. Extending the settling time reduces production efficiency, and adjusting the flocculant dosage in the next batch of molten titanium is a trial-and-error approach, as it is uncertain whether the next batch of molten titanium will experience settling difficulties or what dosage is appropriate.

[0004] Furthermore, with advancements in titanium resource mining and beneficiation technologies, some previously unrecoverable titanium resources are now being utilized. Additionally, newly mined titanium raw materials exhibit new changes in phase composition, often resulting in poor purification of the titanium slurry after acid hydrolysis. Moreover, changes in acid hydrolysis conditions can also lead to poor acid hydrolysis efficiency, making titanium slurry purification difficult. Therefore, predicting the purification effect of titanium slurry in advance is extremely important, and process adjustments based on the prediction results have a significant impact on the production of titanium dioxide using the sulfuric acid process. Currently, no reports have been found regarding the prediction of titanium slurry purification effects.

[0005] CN119548864A discloses a flocculation sedimentation method to improve the sedimentation effect of titanium liquid in the sulfuric acid process for titanium dioxide production. The method includes the following steps: 1) mixing cationic polyacrylamide emulsion and water to obtain a flocculant; 2) adding the flocculant obtained in the above step to the titanium liquid produced by the sulfuric acid process, allowing it to settle, and obtaining a settled titanium liquid; wherein the high molecular weight cationic polyacrylamide has a molecular weight greater than or equal to 10 million; the high ionicity high molecular weight cationic polyacrylamide has a cationic ionization degree greater than or equal to 50%; and the mass concentration of the flocculant is 1‰ to 1.5‰. This method uses a special flocculant, increasing production costs, and it also fails to allow for the prediction of the purification effect of the titanium liquid, thus hindering the adjustment of the sedimentation process. Summary of the Invention

[0006] In view of the problems of existing sedimentation processes, this invention develops a method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid, and based on this method, the sedimentation process is regulated to solve the problems of poor titanium liquid purification effect and unstable production control.

[0007] The present invention first provides a method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid, which includes the following steps: take 50±2.5mL of acid-hydrolyzed titanium liquid, centrifuge at 1000rpm~9000rpm for 2min~10min, take the clear liquid after centrifugation, test the turbidity, and predict the sedimentation effect based on the relationship between turbidity and flocculant solution dosage. When turbidity is ≤200 NTU, the flocculant solution dosage should be less than 4.0 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 4.0 m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 200 NTU and 400 NTU, the flocculant solution dosage should be less than 4.2 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 4.2m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 400 NTU and 800 NTU, the flocculant solution dosage should be less than 4.5 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 4.5m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 800 NTU and 1200 NTU, the flocculant solution dosage should be less than 5.0 mg / L. 3 / 100m3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 5.0 m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 1200 NTU and 2000 NTU, the flocculant solution dosage should be less than 5.5 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 5.5m³. 3 / 100m 3 If the settlement effect is satisfactory, it can be predicted.

[0008] Preferably, in the above method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid, centrifugation is performed at 3000 rpm for 3 min.

[0009] In the above-mentioned method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid, the preparation method of the flocculant solution is as follows: dissolve solid cationic polyacrylamide in water to obtain a flocculant aqueous solution with a mass concentration of 0.04%~0.06%.

[0010] Preferably, in the above-mentioned method for predicting the sedimentation effect of industrial acid hydrolysis titanium liquid, the preparation method of the flocculant solution is as follows: dissolve solid cationic polyacrylamide in water to obtain a flocculant aqueous solution with a mass concentration of 0.05%.

[0011] In the above-mentioned method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium solution, when taking 50±2.5mL of acid-hydrolyzed titanium solution, the temperature of the acid-hydrolyzed titanium solution is 50~75℃; when adding flocculant solution, the temperature of the acid-hydrolyzed titanium solution is 50~75℃.

[0012] The present invention, through the above-mentioned method for predicting sedimentation effect, can accurately predict the sedimentation effect, thereby allowing for timely adjustment of the flocculant solution dosage and timely optimization of the acid-peeling ratio of abnormal and normal titanium raw materials. This solves the problems of significant differences in the acid-peeling performance of abnormal titanium raw materials and the difficulty in purifying titanium liquid from acid-peeling alone.

[0013] This invention also provides a method for sedimentation of industrial acid-hydrolyzed titanium liquid, comprising the following steps: A. After acid hydrolysis of titanium raw materials, acid hydrolyzed titanium liquid is obtained. A flocculant solution is added to the acid hydrolyzed titanium liquid. After sedimentation, 100±5mL of the supernatant is taken for filtration. If the filtration time is higher than 3min, the titanium raw material is judged to be abnormal titanium raw material; if the filtration time is not higher than 3min, the titanium raw material is judged to be normal titanium raw material. B. The abnormal titanium raw material, or normal titanium raw material, or abnormal titanium raw material and normal titanium raw material in a mass ratio of 1:1~9, are acidified according to the sulfuric acid process to obtain acidified titanium liquid. Take 50±2.5mL of acidified titanium liquid and centrifuge it at a speed of 1000rpm~9000rpm for 2min~10min. Take the clear liquid after centrifugation and test the turbidity. Determine the amount of flocculant solution to be added based on the correspondence between turbidity and flocculant solution dosage. When turbidity is ≤200 NTU, the flocculant solution dosage should not be less than 4.0 mg / L. 3 / 100m 3 ; When turbidity is between 200 NTU and 400 NTU, the flocculant solution dosage should be no less than 4.2 mg / L. 3 / 100m 3 ; When turbidity is between 400 NTU and 800 NTU, the flocculant solution dosage should be no less than 4.5 mg / L. 3 / 100m 3 ; When turbidity is between 800 NTU and 1200 NTU, the flocculant solution dosage should be no less than 5.0 mg / L. 3 / 100m 3 ; When turbidity is between 1200 NTU and 2000 NTU, the flocculant solution dosage should be no less than 5.5 mg / L. 3 / 100m 3 ; C. Add the flocculant solution to the acid-hydrolyzed titanium solution according to the amount determined in step B. After sedimentation, take the supernatant and filter it to obtain the purified titanium solution.

[0014] Preferably, in the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, in step B, to simultaneously ensure sedimentation effect and production cost, when the turbidity is ≤200 NTU, the flocculant solution dosage is 4.0 m³. 3 / 100m 3 When turbidity is between 200 NTU and 400 NTU, the flocculant solution dosage is 4.2 mg / L. 3 / 100m 3 When turbidity is between 400 NTU and 800 NTU, the flocculant solution dosage is 4.5 mg / L. 3 / 100m 3 When turbidity is between 800 NTU and 1200 NTU, the flocculant solution dosage is 5.0 mg / L. 3 / 100m 3 When turbidity is between 1200 NTU and 2000 NTU, the flocculant solution dosage is 5.5 mg / L. 3 / 100m 3 .

[0015] Preferably, in the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, in step B, abnormal titanium raw materials or qualified titanium raw materials or abnormal titanium raw materials and qualified titanium raw materials with a mass ratio of 1:4 are acid-hydrolyzed according to the sulfuric acid process.

[0016] Preferably, in the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, in step B, the liquid is centrifuged at 3000 rpm for 3 min.

[0017] In the above-mentioned industrial acid hydrolysis titanium liquid sedimentation method, in steps A and B, the flocculant solution is prepared by dissolving solid cationic polyacrylamide in water to obtain a flocculant aqueous solution with a mass concentration of 0.04%~0.06%.

[0018] Preferably, in the above-mentioned industrial acid hydrolysis titanium liquid sedimentation method, the flocculant solution is prepared by dissolving solid cationic polyacrylamide in water to obtain a flocculant aqueous solution with a mass concentration of 0.05%.

[0019] In this invention, the sedimentation effect of titanium liquid is evaluated by the time required to filter 100 mL. A time of no more than 3 minutes is considered acceptable, while a time exceeding 3 minutes indicates poor sedimentation. The dosage of flocculant solution during sedimentation is 3% to 5% (volume percentage) of the titanium liquid volume, typically 4%, i.e., 100 mL. 3 Add 4m of flocculant solution to acid-hydrolyzed titanium solution 3 This method can be used to determine whether titanium raw materials are normal. Abnormal titanium raw materials refer to those with significantly different acidolysis properties and for which the titanium liquid obtained by acidolysis alone is difficult to purify. Normal titanium raw materials refer to those with stable and good acidolysis properties and for which the titanium liquid can be purified normally under normal production operating conditions. In this invention, the titanium raw materials are conventional raw materials in the field, such as titanium concentrate and acid-soluble titanium slag.

[0020] In the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, the sedimentation time in step A is 1~2 hours.

[0021] In the aforementioned industrial acid-hydrolyzed titanium solution sedimentation method, in step B, when taking 50±2.5 mL of acid-hydrolyzed titanium solution, the temperature of the solution is 50~75℃. The acid-hydrolyzed titanium solution taken in step B of this invention is at a temperature of 50~75℃ and is directly taken from the acid-hydrolyzed pot or titanium solution dissolving tank after acid hydrolysis. To avoid systematic errors, the sampled titanium solution needs to be representative, and is generally taken while the titanium solution is being stirred.

[0022] In the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, in step C, when the flocculant solution is added, the temperature of the acid-hydrolyzed titanium liquid is 50~75℃.

[0023] In the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, the sedimentation time in step C is 1~2 hours.

[0024] In the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, in step C, by optimizing the dosage of flocculant solution, the filtration time of the settled titanium liquid is ensured to be ≤3min / 100mL.

[0025] In the above-mentioned industrial acid-hydrolyzed titanium liquid sedimentation method, step C ensures that the solid content of the purified titanium liquid is ≤50ppm by optimizing the dosage of flocculant solution.

[0026] In this invention, the turbidity of the titanium slurry was measured under selected centrifugation speeds (1000 rpm to 9000 rpm, preferably 3000 rpm) and centrifugation times (2 min to 10 min, preferably 3 min). Simultaneously, by systematically analyzing the correlation between the flocculant solution dosage and the filtration time after sedimentation of the titanium slurry, the critical dosage of flocculant solution required to ensure that the filtration time of the titanium slurry does not exceed 3 min / 100 mL was determined. Based on this, this invention conducted turbidity analysis on multiple batches of titanium slurry and corresponding sedimentation experiments with different flocculant solution dosages, ultimately establishing a quantitative relationship between the turbidity of the titanium slurry and the optimal dosage of flocculant solution, as shown in Table 1.

[0027] Table 1 Correspondence between Turbidity and Flocculant Solution Dosage Based on the above table of turbidity and flocculant solution dosage, this invention further develops the above-mentioned method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid and the sedimentation method.

[0028] In this invention, the acidolysis process of the titanium raw material is a conventional acidolysis process using sulfuric acid in the art, and the resulting acidolyzed titanium liquid is also a conventional titanium liquid obtained by acidolysis of titanium raw material conventionally used in the art to prepare titanium dioxide using conventional sulfuric acid in the art.

[0029] In this invention, after sedimentation, the filtration operation is performed according to conventional procedures in the art. For example, when obtaining filtration time indicators, the operation method is as follows: Take a 120mL Buchner funnel, place a double layer of qualitative filter paper on it, and install it in a filter flask. Turn on the vacuum pump, moisten the filter paper with a small amount of water to ensure that a vacuum is formed and the filter paper adheres. Add 100mL of titanium solution at once, maintaining the filtration vacuum degree within the range of -0.05 to -0.06MPa. Record the time required from the completion of liquid addition until there is no free liquid on the surface of the filter paper (drying).

[0030] In this invention, a centrifuge is used for centrifugation; a turbidimeter is used to test turbidity, which is used to characterize the quantity and particle size of suspended matter in the titanium liquid.

[0031] The beneficial effects of this invention are: This invention can quickly predict the sedimentation effect of titanium liquid before adding flocculant solution, and can control the process by predicting the purification effect of titanium liquid. By analyzing the correlation between turbidity and flocculant solution dosage, the dosage of flocculant solution can be optimized in a timely manner. It can also optimize the acid-peeling ratio of abnormal and normal titanium raw materials, solving the problem of significant differences in the acid-peeling performance of abnormal titanium raw materials and the difficulty in purifying titanium liquid from acid-peeling alone. This invention can ensure that the quality of titanium liquid meets the production process requirements, is simple to operate, easy to realize industrial production, and has good prospects for promotion and application. Detailed Implementation

[0032] The present invention will be further described in detail below through embodiments, but the scope of protection of the present invention is not limited to the embodiments described herein.

[0033] In this embodiment, the flocculant solution was prepared by dissolving solid cationic polyacrylamide in water to obtain a flocculant solution with a mass concentration of 0.05%; the conventional dosage was 4% (volume percentage) of the titanium liquid volume, i.e., 100m³. 3 Add 4m of flocculant solution to titanium liquid 3 .

[0034] Titanium concentrate is acidified using the conventional sulfuric acid process to obtain acidified titanium liquid. 200 mL of the acidified titanium liquid is taken, and 8 mL of flocculant solution is added to it. After settling for 1 hour, 100 mL of the supernatant is taken and filtered. If the filtration time is higher than 3 minutes, it is abnormal titanium concentrate. If the filtration time is not higher than 3 minutes, it is normal titanium concentrate.

[0035] Example 1 120m of titanium liquid was obtained after acid lysis of normal titanium concentrate. 3 50 mL of titanium solution was taken from the acid hydrolysis vessel, centrifuged at 3000 rpm for 3 minutes, and the turbidity of the supernatant was measured to be 180 NTU. Referring to the table corresponding to turbidity and flocculant dosage, the dosage per 100 mL of solution was found to be... 3 The dosage of flocculant solution added to the titanium liquid was 4.0 m³. 3 Towards 120m 3 Add 4.8m of flocculant solution to titanium liquid. 3 After settling for 2 hours, the filtration time was measured to be 2.2 min / 100 mL, and the solid content of the purified titanium liquid was 40 ppm.

[0036] Example 2 125m of titanium liquid was obtained after acidolysis of abnormal titanium concentrate. 3 50 mL of titanium solution was taken from the acid hydrolysis vessel, centrifuged at 3000 rpm for 3 minutes, and the turbidity of the supernatant was measured to be 350 NTU. Referring to the table corresponding to turbidity and flocculant dosage, the dosage per 100 mL of solution was found to be... 3The dosage of flocculant solution added to the titanium liquid was 4.2 m³. 3 Towards 125m 3 Add 5.25m of flocculant solution to titanium liquid. 3 After settling for 2 hours, the filtration time was measured to be 2.4 min / 100 mL, and the solid content of the purified titanium liquid was 44 ppm.

[0037] Example 3 131m of titanium liquid was obtained after acidolysis of abnormal titanium concentrate. 3 50 mL of titanium solution was taken from the acid hydrolysis vessel, centrifuged at 3000 rpm for 3 minutes, and the turbidity of the supernatant was measured to be 635 NTU. Referring to the table corresponding to turbidity and flocculant dosage, the dosage per 100 mL of solution was found to be... 3 The dosage of flocculant solution added to the titanium liquid was 4.5m. 3 Towards 131m 3 Add 5.90m of flocculant solution to titanium liquid. 3 After settling for 2 hours, the filtration time was measured to be 2.6 min / 100 mL, and the solid content of the purified titanium liquid was 47 ppm.

[0038] Example 4 124m of titanium liquid was obtained after acidolysis of abnormal titanium concentrate. 3 50 mL of titanium solution was taken from the acid hydrolysis vessel, centrifuged at 3000 rpm for 3 minutes, and the turbidity of the supernatant was measured to be 1125 NTU. Referring to the table corresponding to turbidity and flocculant dosage, the dosage per 100 mL of solution was found to be... 3 The dosage of flocculant solution added to the titanium liquid was 5.0 m³. 3 Towards 124m 3 Add 6.2m of flocculant solution to titanium liquid. 3 After settling for 2 hours, the filtration time was measured to be 2.5 min / 100 mL, and the solid content of the purified titanium liquid was 46 ppm.

[0039] Example 5 130 ml of titanium melt was obtained by acidolysis of abnormal titanium concentrate and normal titanium concentrate at a mass ratio of 1:4. 3 50 mL of titanium solution was taken from the acid hydrolysis vessel, centrifuged at 3000 rpm for 3 minutes, and the turbidity of the supernatant was measured to be 552 NTU. Referring to the table corresponding to turbidity and flocculant dosage, the dosage per 100 mL of solution was found to be... 3 The dosage of flocculant solution added to the titanium liquid was 4.5m. 3 130m 3 Add 5.85m of flocculant solution to titanium liquid. 3 After settling for 2 hours, the filtration time was measured to be 2.4 min / 100 mL, and the solid content of the purified titanium liquid was 45 ppm.

[0040] Comparative Example 1 135m of titanium liquid was obtained after acidolysis of abnormal titanium concentrate. 3 50 mL of titanium solution was taken from the acid hydrolysis vessel, centrifuged at 3000 rpm for 3 minutes, and the turbidity of the supernatant was measured to be 1042 NTU. Referring to the table corresponding to turbidity and flocculant dosage, the dosage per 100 mL of solution was found to be... 3 The dosage of flocculant solution added to the titanium liquid was 5.0 m³. 3 Towards 135m 3 Add 5.4m of flocculant solution to titanium liquid. 3 After settling for 2 hours, the filtration time was measured to be 9.5 min / 100 mL, and the solid content of the purified titanium liquid was 94 ppm.

[0041] Table 2 Results of Examples and Comparative Examples In summary, by predicting the purification effect of titanium liquid, timely optimizing and adjusting the dosage of flocculant and the ratio of acid hydrolysis ore feeding, this invention can ensure that the purification effect of titanium liquid meets the requirements of the production process.

Claims

1. A method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid, characterized in that: Includes the following steps: Take 50±2.5mL of acid-hydrolyzed titanium solution and centrifuge at 1000rpm~9000rpm for 2min~10min. Take the clear liquid after centrifugation and test the turbidity. Based on the relationship between turbidity and flocculant dosage, predict the sedimentation effect. When turbidity is ≤200 NTU, the flocculant solution dosage should be less than 4.0 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 4.0 m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 200 NTU and 400 NTU, the flocculant solution dosage should be less than 4.2 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 4.2m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 400 NTU and 800 NTU, the flocculant solution dosage should be less than 4.5 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 4.5m³. 3 / 100m 3 If so, the settlement effect is presumed to be satisfactory; When turbidity is between 800 NTU and 1200 NTU, the flocculant solution dosage should be less than 5.0 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 5.0 m³. 3 / 100m 3 If so, the settlement effect is judged to be satisfactory; When turbidity is between 1200 NTU and 2000 NTU, the flocculant solution dosage should be less than 5.5 mg / L. 3 / 100m 3 If the sedimentation effect is deemed unqualified, the flocculant solution dosage should be no less than 5.5m³. 3 / 100m 3 If the settlement effect is satisfactory, it can be predicted.

2. The method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid according to claim 1, characterized in that: Centrifuge at 3000 rpm for 3 min.

3. The method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid according to claim 1, characterized in that: The flocculant solution is prepared by dissolving solid cationic polyacrylamide in water to obtain a flocculant aqueous solution with a mass concentration of 0.04%~0.06%.

4. The method for predicting the sedimentation effect of industrial acid-hydrolyzed titanium liquid according to any one of claims 1 to 3, characterized in that: When taking 50±2.5mL of acid-hydrolyzed titanium solution, the temperature of the acid-hydrolyzed titanium solution is 50~75℃; when adding flocculant solution, the temperature of the acid-hydrolyzed titanium solution is 50~75℃.

5. A method for settling industrial acid-hydrolyzed titanium solution, characterized in that: Includes the following steps: A. After acid hydrolysis of titanium raw materials, acid hydrolyzed titanium liquid is obtained. A flocculant solution is added to the acid hydrolyzed titanium liquid. After sedimentation, 100±5mL of the supernatant is taken for filtration. If the filtration time is higher than 3min, the titanium raw material is judged to be abnormal titanium raw material; if the filtration time is not higher than 3min, the titanium raw material is judged to be normal titanium raw material. B. The abnormal titanium raw material, or normal titanium raw material, or abnormal titanium raw material and normal titanium raw material in a mass ratio of 1:1~9, are acidified according to the sulfuric acid process to obtain acidified titanium liquid. Take 50±2.5mL of acidified titanium liquid and centrifuge it at a speed of 1000rpm~9000rpm for 2min~10min. Take the clear liquid after centrifugation and test the turbidity. Determine the amount of flocculant solution to be added based on the correspondence between turbidity and flocculant solution dosage. When turbidity is ≤200 NTU, the flocculant solution dosage should not be less than 4.0 mg / L. 3 / 100m 3 ; When turbidity is between 200 NTU and 400 NTU, the flocculant solution dosage should be no less than 4.2 mg / L. 3 / 100m 3 ; When turbidity is between 400 NTU and 800 NTU, the flocculant solution dosage should be no less than 4.5 mg / L. 3 / 100m 3 ; When turbidity is between 800 NTU and 1200 NTU, the flocculant solution dosage should be no less than 5.0 mg / L. 3 / 100m 3 ; When turbidity is between 1200 NTU and 2000 NTU, the flocculant solution dosage should be no less than 5.5 mg / L. 3 / 100m 3 ; C. Add the flocculant solution to the acid-hydrolyzed titanium solution according to the amount determined in step B. After sedimentation, take the supernatant and filter it to obtain the purified titanium solution.

6. The industrial acid-hydrolyzed titanium liquid sedimentation method according to claim 5, characterized in that: In step B, when the turbidity is ≤200 NTU, the flocculant solution dosage is 4.0 mg / L. 3 / 100m 3 When turbidity is between 200 NTU and 400 NTU, the flocculant solution dosage is 4.2 mg / L. 3 / 100m 3 When turbidity is between 400 NTU and 800 NTU, the flocculant solution dosage is 4.5 mg / L. 3 / 100m 3 When turbidity is between 800 NTU and 1200 NTU, the flocculant solution dosage is 5.0 mg / L. 3 / 100m 3 When turbidity is between 1200 NTU and 2000 NTU, the flocculant solution dosage is 5.5 mg / L. 3 / 100m 3 .

7. The industrial acid-hydrolyzed titanium liquid sedimentation method according to claim 5, characterized in that: In step B, the abnormal titanium raw material, qualified titanium raw material, or abnormal titanium raw material and qualified titanium raw material in a mass ratio of 1:4 are acidified according to the sulfuric acid process.

8. The industrial acid-hydrolyzed titanium liquid sedimentation method according to claim 5, characterized in that: In step B, centrifuge at 3000 rpm for 3 minutes.

9. The industrial acid-hydrolyzed titanium liquid sedimentation method according to claim 5, characterized in that: In steps A and B, the flocculant solution is prepared by dissolving solid cationic polyacrylamide in water to obtain a flocculant aqueous solution with a mass concentration of 0.04% to 0.06%.

10. The industrial acid-hydrolyzed titanium liquid sedimentation method according to claim 5, characterized in that: At least one of the following must be met: In step A, the flocculant solution dosage is 4.0 m³. 3 / 100m 3 ; In step A, the settling time is 1-2 hours; In step B, when taking 50±2.5mL of acid-hydrolyzed titanium solution, the temperature of the acid-hydrolyzed titanium solution is 50~75℃; In step C, when adding the flocculant solution, the temperature of the acid-hydrolyzed titanium solution is 50~75℃; In step C, the settling time is 1-2 hours; In step C, the filtration time should be ≤3 min / 100 mL; In step C, the solid content of the purified titanium liquid is ≤50ppm.

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