Chlorination process titanium dioxide rotary kiln lining

Abstract

The utility model relates to a chlorination process titanium dioxide rotary kiln lining in the technical field of rotary kilns. The chlorination process titanium dioxide rotary kiln lining comprises a rotary kiln cylinder. Prefabricated parts are evenly fixed in the cylinder body in the circumferential direction, refractory castable is poured in the interval between every two adjacent prefabricated parts, and a castable belt is formed. The masonry part is provided with two protruding blocks and two grooves, the protruding blocks and the grooves are correspondingly formed in the four edges of the masonry part respectively, the protruding blocks are matched with the grooves, a second nanometer aerogel felt is laid on the side, close to the cylinder body, of the pouring material belt, and a plurality of anchoring nails are evenly arranged on the pouring material belt in the length direction of the pouring material belt. According to the utility model, the prefabricated parts and the castable belts are crosswise arranged in multiple parts along the circumference of the cylinder body, so that the expansion and contraction amount of the cylinder body of the rotary kiln in the high-temperature calcination process can be absorbed, the generation of cracks at high temperature is reduced, the lining is more stable and firmer, the refractory bricks are not easy to fall off, the long-term use at high temperature is facilitated, and the maintenance frequency is low; and the production efficiency can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of rotary kiln technology, specifically relating to a rotary kiln lining for titanium dioxide produced by the chloride process. Background Technology

[0002] Currently, the linings of rotary kilns used in the chloride process for titanium dioxide production are of two types. One type involves directly casting a certain thickness of refractory castable inside the kiln. However, after long-term high-temperature firing, the refractory castable is prone to cracking, and these cracks gradually increase in length over time. The other type uses refractory bricks to construct the entire inner ring of the kiln. However, after long-term high-temperature firing, individual refractory bricks loosen and fall off, and adjacent bricks also loosen, leading to a continuous chain reaction of brick loss. After a period of operation, the kiln needs to be shut down to repair the fallen refractory bricks, resulting in high maintenance frequency, poor calcination effect, and low production efficiency. Therefore, a new type of lining for rotary kilns used in the chloride process for titanium dioxide production is needed to solve these technical problems. Utility Model Content

[0003] To address the aforementioned deficiencies in the existing technology, this utility model provides a rotary kiln lining for titanium dioxide production via the chloride process, comprising a rotary kiln cylinder; preforms are uniformly fixed circumferentially inside the cylinder, and refractory castable is poured into the gap between two adjacent preforms to form a castable strip;

[0004] The precast component includes multiple masonry parts. A nano-aerogel felt is embedded in the side of each masonry part closest to the cylinder. Each masonry part has two protrusions and two grooves, which are respectively positioned on the four sides of the masonry part and are mutually matched. The masonry part is made of refractory brick. This allows adjacent masonry parts to be engaged with each other via corresponding protrusions and grooves, and adjacent precast parts to be engaged with the castable refractory lining via corresponding protrusions and grooves, forming a joint. This makes the precast blocks and castable refractory lining form a unified whole, resulting in greater stability, effectively inhibiting refractory brick detachment, and improving the service life of the lining.

[0005] The side of the casting strip closest to the cylinder is covered with a nano-aerogel felt. Multiple anchoring nails are evenly arranged along the length of the casting strip, and the anchoring nails are welded and fixed to the inner wall of the cylinder.

[0006] Preferably, the dimensions of the masonry component are 500mm×210mm×190mm, and the dimensions of the nano-aerogel felt embedded on each masonry component are 320mm×210mm×50mm.

[0007] Preferably, the thickness of the nano-aerogel felt II is 40 mm.

[0008] Preferably, the cylinder is divided into a low-temperature section and a high-temperature section along the feeding to discharging direction. The lining components corresponding to the low-temperature section are low-temperature lining components, the first nano-aerogel felt corresponding to the low-temperature section is low-temperature nano-aerogel, the castable strip corresponding to the low-temperature section is low-temperature castable, and the second nano-aerogel felt corresponding to the low-temperature section is low-temperature nano-aerogel. The lining components corresponding to the high-temperature section are high-temperature lining components, the first nano-aerogel felt corresponding to the high-temperature section is high-temperature nano-aerogel, the castable strip corresponding to the high-temperature section is high-temperature castable, and the second nano-aerogel felt corresponding to the high-temperature section is high-temperature nano-aerogel. Based on the rotary kiln operating conditions, the linings of the high-temperature section and the low-temperature section along the length from the discharge port to the feed port are respectively made of corresponding materials to further improve the stability of the lining and extend its service life.

[0009] Preferably, the high-temperature section has a length of 40m and the low-temperature section has a length of 30m.

[0010] Preferably, the preform and the casting strip divide the cylinder into 24 parts evenly along the circumference.

[0011] This invention also includes other components that enable the normal use of a rotary kiln lining for titanium dioxide produced via the chloride process, all of which are conventional techniques in the field. Furthermore, devices or components not specified in this invention, such as refractory bricks, nano-aerogels, castables, and anchoring nails, all employ conventional techniques and equipment in the field.

[0012] The beneficial effects of this utility model are as follows: the precast components and the castable strip are arranged in multiple cross sections along the circumference of the cylinder, which can absorb the expansion and contraction of the rotary kiln cylinder during high-temperature calcination, reduce the generation of cracks at high temperatures, and at the same time, the resulting inner lining structure is more stable and firm. The refractory bricks of the precast components are not easy to fall off, which is conducive to long-term use at high temperatures, reduces the maintenance frequency, and improves production efficiency. The use of nano-aerogel felt as insulation material, with nano-aerogel felt embedded in the masonry components near the cylinder, can effectively block heat conduction to the outer cylinder, reduce the temperature outside the cylinder, and improve production safety. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of a rotary kiln lining for titanium dioxide production via the chloride process, as described in this utility model embodiment.

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 for Figure 1 Sectional view of the prefabricated component;

[0017] Figure 4 for Figure 1 Cross-sectional view of the refractory strip in the middle.

[0018] In the figure: 1. Cylinder; 2. Castable strip; 3. Refractory brick; 4. Anchor nail; 5. Nano-aerogel felt II; 6. Groove; 7. Low-temperature masonry component; 8. High-temperature masonry component; 9. Low-temperature nano-aerogel; 10. High-temperature nano-aerogel; 11. Low-temperature castable; 12. High-temperature castable. Detailed Implementation

[0019] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0020] Example

[0021] like Figure 1-4 As shown, this utility model provides a rotary kiln lining for titanium dioxide produced by the chloride process, including a rotary kiln cylinder 1; prefabricated parts are uniformly fixed along the circumference inside the cylinder 1, and refractory castable is poured between adjacent prefabricated parts to form a castable strip 2.

[0022] The precast component includes multiple masonry parts. A nano-aerogel felt 5 is embedded on the side of each masonry part closest to the cylinder 1. Each masonry part has two protrusions and two grooves 6, which are respectively positioned on the four sides of the masonry part and are mutually matched. The masonry part is a refractory brick 3. This allows adjacent masonry parts to be engaged with each other via corresponding protrusions and grooves, and adjacent precast parts to be engaged with the castable refractory refractory refractory 3 via corresponding protrusions and grooves, forming a joint. This makes the precast blocks and castable refractory refractory 3 form a unified whole, resulting in greater stability, effectively inhibiting the detachment of the refractory bricks 3, and improving the service life of the lining.

[0023] A nano-aerogel felt is laid on the side of the casting strip 2 near the cylinder 1. Anchor nails 4 are welded on the casting strip 2 every 500mm along its length. The anchor nails 4 are welded and fixed to the inner wall of the cylinder 1. The anchor nails are V-shaped, and the bent part of the anchor nail is welded and fixed to the inner wall of the cylinder. This setting further improves the function of the anchor nails and makes the casting strip more secure.

[0024] The dimensions of the masonry component are 500mm×210mm×190mm, and the dimensions of the nano-aerogel felt-5 embedded on each masonry component are 320mm×210mm×50mm.

[0025] The thickness of the nano-aerogel felt 2 is 40 mm.

[0026] The cylinder 1 is divided into a low-temperature section and a high-temperature section along the feeding to discharging direction. The low-temperature section corresponds to a low-temperature lining component 7, a low-temperature nano-aerogel felt 5 (made of low-temperature nano-aerogel 9), a low-temperature castable strip 2 (made of low-temperature castable 11), and a second low-temperature nano-aerogel felt (made of low-temperature nano-aerogel 9). The high-temperature section corresponds to a high-temperature lining component 8, a high-temperature nano-aerogel felt 5 (made of high-temperature nano-aerogel 10), a second high-temperature castable strip 2 (made of high-temperature castable 12), and a second high-temperature nano-aerogel felt (made of high-temperature nano-aerogel 10). Based on the rotary kiln operating conditions, the linings of the high-temperature and low-temperature sections along the length from the discharge port to the feed port are made of corresponding materials to further improve the stability and service life of the linings.

[0027] The high-temperature section is 40m long, and the low-temperature section is 30m long.

[0028] The precast component and the casting strip 2 divide the cylinder 1 into 24 parts evenly along the circumference.

[0029] Working Principle: The lining consists of precast components and castable strips arranged in 24 sections along the circumference of the kiln cylinder in a staggered pattern. During operation, this lining structure absorbs the expansion and contraction of the kiln cylinder during high-temperature calcination, reducing cracking at high temperatures. This results in a more stable and robust lining structure, preventing the refractory bricks from falling off and facilitating long-term use at high temperatures. It also reduces maintenance frequency and improves production efficiency. Nano-aerogel felt is used as insulation material, and its embedding near the cylinder further enhances stability and effectively blocks heat transfer to the outer cylinder, reducing external temperature and improving production safety. Furthermore, based on the kiln's operating conditions, the high-temperature and low-temperature sections along the length from the discharge port to the feed port utilize appropriate high-temperature and low-temperature materials respectively, further enhancing lining stability and extending its service life.

[0030] The refractory bricks, nano-aerogels, castables, and anchor nails used in this embodiment are all existing technologies. This application does not make any improvements to them, but only utilizes their existing functions. For their specific structures and principles, please refer to the product manual or existing technical documents, which are all existing technologies.

[0031] The embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lining for a rotary kiln used in the chloride process for titanium dioxide production, comprising the kiln's cylinder; characterized in that: Precast components are uniformly fixed circumferentially inside the cylinder, and refractory castable is poured between the intervals of two adjacent precast components to form a castable strip; The precast component includes multiple masonry components. A nano-aerogel felt is embedded on the side of the masonry component near the cylinder. The masonry component is provided with two protrusions and two grooves. The protrusions and grooves are respectively arranged on the four sides of the masonry component, and the protrusions and grooves match each other. The side of the casting strip closest to the cylinder is covered with a nano-aerogel felt. Multiple anchoring nails are evenly arranged along the length of the casting strip, and the anchoring nails are welded and fixed to the inner wall of the cylinder.

2. The lining of a rotary kiln for chloride-process titanium dioxide production according to claim 1, characterized in that: The dimensions of the masonry component are 500mm×210mm×190mm, and the dimensions of the nano-aerogel felt embedded on each masonry component are 320mm×210mm×50mm.

3. The lining of a rotary kiln for chloride-process titanium dioxide production according to claim 1, characterized in that: The thickness of the nano-aerogel felt 2 is 40 mm.

4. The lining of a rotary kiln for chloride-process titanium dioxide production according to claim 1, characterized in that: The cylinder is divided into a low-temperature section and a high-temperature section along the feeding to discharging direction. The masonry component corresponding to the low-temperature section is a low-temperature masonry component, the first nano-aerogel felt corresponding to the low-temperature section is low-temperature nano-aerogel, the castable strip corresponding to the low-temperature section is low-temperature castable, and the second nano-aerogel felt corresponding to the low-temperature section is low-temperature nano-aerogel. The masonry component corresponding to the high-temperature section is a high-temperature masonry component, the first nano-aerogel felt corresponding to the high-temperature section is high-temperature nano-aerogel, the castable strip corresponding to the high-temperature section is high-temperature castable, and the second nano-aerogel felt corresponding to the high-temperature section is high-temperature nano-aerogel.

5. The lining of a rotary kiln for chloride-process titanium dioxide production according to claim 4, characterized in that: The high-temperature section is 40m long, and the low-temperature section is 30m long.

6. The lining of a rotary kiln for chloride-process titanium dioxide production according to claim 1, characterized in that: The precast components and casting strips divide the cylinder into 24 equal parts along the circumference.

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