Cooling method for improving acidolysis rate of titanium slag

Abstract

This invention relates to the field of titanium slag cooling technology, specifically disclosing a cooling method for improving the acidolysis rate of titanium slag, comprising the following steps: loading the discharged titanium slag into a slag pot, the slag pot being preheated; insulating the slag pot, controlling the internal temperature of the titanium slag in the slag pot to be 1550-1580℃ for a first time, and controlling the internal temperature of the titanium slag in the slag pot to be 1450-1550℃ for a second time; when the titanium slag temperature drops to a preset threshold, cooling the slag pot, and then cooling it to the crushing temperature using conventional methods. This invention, by loading the discharged titanium slag into a slag pot, insulating the slag pot, and separately insulating the titanium slag in the slag pot at internal temperatures of 1550-1580℃ and 1450-1550℃, and then cooling the slag pot when the titanium slag temperature drops to a preset threshold, promotes the growth of the black titanium stone phase and reduces the encapsulation of silicates on the black titanium stone through targeted temperature control, thereby improving the acidolysis rate of the titanium slag.

Description

Technical Field

[0001] This invention specifically relates to the field of titanium slag cooling technology, and more specifically to a cooling method for improving the acid hydrolysis rate of titanium slag. Background Technology

[0002] Acid-soluble titanium slag is an important raw material for the sulfuric acid process in titanium dioxide production. Using titanium slag as a raw material for this process not only increases the output per unit of equipment and shortens the process flow, but also fundamentally solves the environmental problems caused by ferrous sulfate, a byproduct of the sulfuric acid process. However, during the acidolysis of titanium slag, the acidolysis rate is often lower than that of titanium concentrate. Besides the influence of rutile, the encapsulation of zeolite by silicates and the small size of the zeolite phase are also significant contributing factors. Research shows that reducing silicate encapsulation of zeolite and promoting zeolite growth can effectively improve the acidolysis rate of titanium slag. Therefore, controlling the cooling rate of the titanium slag exiting the furnace and controlling crystal growth to improve the acidolysis rate is a pressing technical problem that needs to be solved.

[0003] The invention patent with publication number CN108946802A discloses a method for improving the acid hydrolysis rate of titanium slag. The steps include premixing titanium slag, 98% concentrated sulfuric acid, and acid hydrolysis aid under stirring conditions to obtain a premixed material, adding the premixed material to a reactor, introducing water or steam to initiate the reaction for acid hydrolysis, and after the main acid hydrolysis reaction is completed, obtaining acid hydrolyzed titanium liquid through aging, leaching, and filtration. The acid hydrolysis aid is a small molecule alcohol.

[0004] Although the above invention is simple to operate and easy to implement, and can effectively improve the acid hydrolysis rate of titanium slag, with an intermittent acid hydrolysis rate of 95%-96%, it still has the disadvantage of reducing the encapsulation of silicates on black titanium stone and the low growth rate of black titanium stone, which makes it difficult to achieve the expected acid hydrolysis rate of titanium slag. Summary of the Invention

[0005] The purpose of this invention is to provide a cooling method to improve the acid hydrolysis rate of titanium slag, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A cooling method for improving the acid hydrolysis rate of titanium slag includes the following steps:

[0008] Step 1: Load the titanium slag from the furnace into a slag pot, which is preheated.

[0009] Step 2: Insulate the slag pot, control the internal temperature of the titanium slag in the slag pot to 1550-1580℃ for the first time, and control the internal temperature of the titanium slag in the slag pot to 1450-1550℃ for the second time.

[0010] Step 3: When the temperature of the titanium slag drops to the preset threshold, the slag pot is cooled down and then cooled to the crushing temperature using conventional methods.

[0011] As a further aspect of the present invention: in step one, the temperature of the preheating treatment is greater than 600°C.

[0012] As a further aspect of the present invention: in step two, the temperature of the titanium slag inside the slag pot is controlled at 1550-1580℃ and the heat preservation time is 0.5-2h.

[0013] As a further aspect of the present invention: in step two, the temperature of the titanium slag is controlled at 1450-1550℃ and the holding time is 0.5-5h.

[0014] As a further aspect of the present invention: the method for heat preservation treatment of the slag pot in step two includes the following steps:

[0015] Step a: After the titanium slag from the furnace is loaded into the slag pot, cover it with a lid to keep it warm and prevent oxidation;

[0016] Step b: After the titanium slag from the furnace is loaded into the can, it should be quickly moved to the insulation section and kept warm using insulation methods.

[0017] As a further aspect of the present invention: in step b, the heat preservation operation includes heat preservation using electric furnace exhaust gas combustion or ladle furnace.

[0018] As a further aspect of the present invention: in step three, the preset threshold is 1450°C.

[0019] As a further aspect of the present invention: in step three, the method for cooling the slag pot is to transfer the slag pot to a rapid cooling area and spray it with cooling water.

[0020] As a further embodiment of the present invention: cooling water is sprayed to cool to below 1250°C, and the spraying time is ≤1 hour.

[0021] As a further aspect of the present invention: in step three, conventional methods include air cooling and water cooling.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention loads the titanium slag from the furnace into a slag pot, insulates the slag pot, and separately insulates the titanium slag inside the slag pot at temperatures of 1550-1580℃ and 1450-1550℃. When the temperature of the titanium slag drops to a preset threshold, the slag pot is cooled. Through targeted temperature control, the growth of the black titanium phase is promoted, and the encapsulation of silicates on black titanium is reduced, thereby improving the acidolysis rate of the titanium slag. Attached Figure Description

[0023] Figure 1A flowchart of a cooling method to improve the acidolysis rate of titanium slag. Detailed Implementation

[0024] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0029] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Acid-soluble titanium slag is an important raw material for the sulfuric acid process in titanium dioxide production. Using titanium slag as a raw material for this process not only increases the output per unit of equipment and shortens the process flow, but also fundamentally solves the environmental problems caused by ferrous sulfate, a byproduct of the sulfuric acid process. However, during the acidolysis of titanium slag, the acidolysis rate is often lower than that of titanium concentrate. Besides the influence of rutile, the encapsulation of zeolite by silicates and the small size of the zeolite phase are also significant contributing factors. Research shows that reducing silicate encapsulation of zeolite and promoting zeolite growth can effectively improve the acidolysis rate of titanium slag. Therefore, controlling the cooling rate of the titanium slag exiting the furnace and controlling crystal growth to improve the acidolysis rate is a pressing technical problem that needs to be solved.

[0032] Example 1

[0033] Please see Figure 1 In this embodiment of the invention, a cooling method for improving the acid hydrolysis rate of titanium slag includes the following steps:

[0034] Step 1: Load the titanium slag from the furnace into a slag pot. The slag pot is preheated. In this embodiment, the preheating temperature is 650°C.

[0035] Step 2: Insulate the slag pot, control the temperature of the titanium slag inside the slag pot to 1550℃ for 0.5h, and the temperature of the titanium slag to 1450℃ for 0.5h, so as to effectively promote the crystallization and growth of the black titanium phase, while avoiding the premature crystallization of silicate to form inclusions with black titanium.

[0036] In step two of the embodiments of this application, the method for heat preservation treatment of the slag pot includes the following steps:

[0037] Step a: After the titanium slag from the furnace is loaded into the slag pot, cover it with a lid to keep it warm and prevent oxidation;

[0038] Step b: After the titanium slag from the furnace is loaded into cans, it is quickly moved to the heat preservation section, and heat preservation operations are carried out using technologies such as electric furnace tail gas combustion and ladle furnace to reduce the cooling rate of the titanium slag.

[0039] Step 3: When the temperature of the titanium slag drops to 1450℃, the slag pot is cooled down, and then it can be cooled to the crushing temperature using conventional methods.

[0040] In step three of the embodiments of this application, the method for cooling the slag pot is as follows: the slag pot is transferred to a rapid cooling area, and cooling water is sprayed on it to rapidly cool it to below 1250°C for a spraying time of ≤1 hour; furthermore, the spraying parts for using cooling water include the top, sides, etc.

[0041] Furthermore, in step three of the embodiments of this application, conventional methods include water cooling and air cooling.

[0042] Example 2

[0043] Please see Figure 1 In this embodiment of the invention, a cooling method for improving the acid hydrolysis rate of titanium slag includes the following steps:

[0044] Step 1: Load the titanium slag from the furnace into a slag pot. The slag pot is preheated. In this embodiment, the preheating temperature is 700°C.

[0045] Step 2: Insulate the slag pot, control the temperature of the titanium slag inside the slag pot to 1580℃ for 2 hours, and the temperature of the titanium slag to 1550℃ for 5 hours, so as to effectively promote the crystallization and growth of the black titanium phase, while avoiding the premature crystallization of silicates to form inclusions with black titanium.

[0046] In step two of the embodiments of this application, the method for heat preservation treatment of the slag pot includes the following steps:

[0047] Step a: After the titanium slag from the furnace is loaded into the slag pot, cover it with a lid to keep it warm and prevent oxidation;

[0048] Step b: After the titanium slag from the furnace is loaded into cans, it is quickly moved to the heat preservation section, and heat preservation operations are carried out using technologies such as electric furnace tail gas combustion and ladle furnace to reduce the cooling rate of the titanium slag.

[0049] Step 3: When the temperature of the titanium slag drops to 1450℃, the slag pot is cooled down, and then it can be cooled to the crushing temperature using conventional methods.

[0050] In step three of the embodiments of this application, the method for cooling the slag pot is as follows: the slag pot is transferred to a rapid cooling area, and cooling water is sprayed on it to rapidly cool it to below 1250°C for a spraying time of ≤1 hour; furthermore, the spraying parts for using cooling water include the top, sides, etc.

[0051] Furthermore, in step three of the embodiments of this application, conventional methods include water cooling and air cooling.

[0052] Example 3

[0053] Please see Figure 1 In this embodiment of the invention, a cooling method for improving the acid hydrolysis rate of titanium slag includes the following steps:

[0054] Step 1: Load the titanium slag from the furnace into a slag pot. The slag pot is preheated. In this embodiment, the preheating temperature is 650°C.

[0055] Step 2: Insulate the slag pot, control the temperature of the titanium slag inside the slag pot to 1560℃ for 0.8h, and the temperature of the titanium slag to 1500℃ for 1.5h, so as to effectively promote the crystallization and growth of the black titanium phase, while avoiding the premature crystallization of silicate to form inclusions with black titanium.

[0056] In step two of the embodiments of this application, the method for heat preservation treatment of the slag pot includes the following steps:

[0057] Step a: After the titanium slag from the furnace is loaded into the slag pot, cover it with a lid to keep it warm and prevent oxidation;

[0058] Step b: After the titanium slag from the furnace is loaded into cans, it is quickly moved to the heat preservation section, and heat preservation operations are carried out using technologies such as electric furnace tail gas combustion and ladle furnace to reduce the cooling rate of the titanium slag.

[0059] Step 3: When the temperature of the titanium slag drops to 1450℃, the slag pot is cooled down, and then it can be cooled to the crushing temperature using conventional methods.

[0060] In step three of the embodiments of this application, the method for cooling the slag pot is as follows: the slag pot is transferred to a rapid cooling area, and cooling water is sprayed on it to rapidly cool it to below 1250°C for a spraying time of ≤1 hour; furthermore, the spraying parts for using cooling water include the top, sides, etc.

[0061] Furthermore, in step three of the embodiments of this application, conventional methods include water cooling and air cooling.

[0062] In summary, this invention involves loading the titanium slag from the furnace into a slag pot, insulating the slag pot, and separately insulating the titanium slag inside the slag pot at temperatures of 1550-1580℃ and 1450-1550℃. When the titanium slag temperature drops to a preset threshold, the slag pot is cooled. Through targeted temperature control, the growth of the black titanium phase is promoted, and the encapsulation of silicates on the black titanium phase is reduced, thereby increasing the acidolysis rate of the titanium slag. This method is implemented after the titanium slag is discharged from the furnace. By adopting different insulation and rapid cooling methods, the cooling rate can be controlled, thereby controlling crystal growth and improving the acidolysis rate.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0064] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cooling method for improving the acidolysis rate of titanium slag, characterized by, Includes the following steps: Step 1: Load the titanium slag from the furnace into a slag pot, which is preheated. Step 2: Insulate the slag pot, control the internal temperature of the titanium slag in the slag pot to 1550-1580℃ for the first time, and control the internal temperature of the titanium slag in the slag pot to be above 1450℃ but below 1550℃ for the second time. Step 3: When the temperature of the titanium slag drops to the preset threshold, the slag pot is cooled down. Then, it is cooled to the crushing temperature using conventional methods. The method for cooling the slag pot is to transfer it to a rapid cooling area and spray it with cooling water.

2. The cooling method for improving the acid hydrolysis rate of titanium slag according to claim 1, characterized in that, In step one, the preheating temperature is greater than 600℃.

3. The cooling method for improving the acid hydrolysis rate of titanium slag according to claim 1, characterized in that, In step two, the first heat preservation time for titanium slag, which controls the internal temperature of the slag pot to 1550-1580℃, is 0.5-2 hours.

4. The cooling method for improving the acid hydrolysis rate of titanium slag according to claim 3, characterized in that, In step two, the titanium slag is kept at a temperature of 1450-1550℃ for a second time of 0.5-5 hours.

5. The cooling method for improving the acidolysis rate of titanium slag according to claim 1, characterized in that, Step two, the method for heat preservation of the slag pot, includes the following steps: Step a: After the titanium slag from the furnace is loaded into the slag pot, cover it with a lid to keep it warm and prevent oxidation; Step b: After the titanium slag from the furnace is loaded into the can, it should be quickly moved to the insulation section and kept warm using insulation methods.

6. The cooling method for improving the acidolysis rate of titanium slag according to claim 5, characterized in that, In step b, the heat preservation operation includes heat preservation using electric furnace exhaust gas combustion or ladle furnace.

7. The cooling method for improving the acidolysis rate of titanium slag according to claim 1, characterized in that, In step three, the preset threshold is 1450℃.

8. The cooling method for improving the acid hydrolysis rate of titanium slag according to claim 1, characterized in that, Cooling water spray is used to cool the temperature to below 1250℃ for ≤1 hour.

9. The cooling method for improving the acidolysis rate of titanium slag according to claim 1, characterized in that, In step three, the conventional methods include air cooling and water cooling.

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