Fireproof precast block and masonry structure of vanadium extraction rotary kiln
By designing the vanadium-extracting rotary kiln refractory prefabricated blocks and masonry structures with specific structural characteristics, the problem of short service life of existing refractory materials is solved, and higher impact and flush resistance is achieved, extending service life and reducing costs.
Patent Information
- Application Number
- CN202421775887.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-25
AI Technical Summary
Existing rotary kiln refractories are prone to damage under high temperature and chemical erosion, and have a short service life, resulting in increased production costs.
A vanadium-elevating rotary kiln refractory prefabricated block is designed, including the prefabricated block body, front grooves, side projections, back grooves, side grooves and anchors. Through the cooperation of these structural features and anchoring nails, a more solid masonry structure is formed.
It improves the impact and flush resistance of rotary kiln materials, extends the service life and reduces production costs.
Smart Images
Figure CN222849769U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rotary kilns, in particular to a vanadium-extracting rotary kiln refractory prefabricated block and a masonry structure. Background Art
[0002] At present, the main methods of extracting vanadium pentoxide from vanadium-titanium magnetite in the world are sodium roasting and calcium roasting, and the roasting equipment is a rotary kiln. The rotary kiln consists of an external stainless steel cylinder and internal refractory materials. The use conditions of the refractory materials inside the rotary kiln are quite harsh. They must withstand high temperatures and strong chemical erosion, as well as fluctuations in material temperature and impact and scouring of materials. The refractory materials of the rotary kiln must withstand multiple effects such as high temperature, chemical erosion, mechanical wear, material temperature changes, material impact and scouring, so the working layer of the rotary kiln is extremely easy to be damaged, and the refractory materials generally have to be replaced every two years of production.
[0003] The existing rotary kiln refractory material is vertically built with high-aluminum bricks. The disadvantage of this structure is that high-temperature vanadium slag will corrode the refractory material, causing the high-aluminum bricks of the rotary kiln to be corroded layer by layer, reducing product quality, shortening the service life of the rotary kiln, and increasing production costs. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a vanadium-extracting rotary kiln refractory prefabricated block with a long service life; the utility model also provides a masonry structure of the vanadium-extracting rotary kiln.
[0005] In order to solve the above technical problems, the technical solution adopted by the prefabricated block of the utility model is: it includes a prefabricated block body and a front groove, a side protrusion, a back groove, a side groove and an anchoring piece arranged on the prefabricated block body; the front groove is located in the middle and lower part of the front of the prefabricated block body and horizontally penetrates the front of the prefabricated block body; the back groove is located in the middle and upper part of the back of the prefabricated block body and horizontally penetrates the back of the prefabricated block body; the side groove is located in the middle and upper part of the side of the prefabricated block body and horizontally penetrates the side of the prefabricated block body; the side protrusion is located in the middle and upper part of the other side and horizontally penetrates the side of the prefabricated block body; the size of the side protrusion matches the side groove, and the height is at the same height as the side groove; there are at least two anchoring pieces, which are fixedly connected to the bottom of the front and back of the prefabricated block body.
[0006] Furthermore, the back groove and the side groove are at the same level.
[0007] Furthermore, the heights of the side protrusions, back grooves and side grooves are all within the range of 1 / 2 to 3 / 4 of the height of the prefabricated block body; the front groove is within the range of 1 / 4 to 1 / 2 of the height of the prefabricated block body.
[0008] In order to solve the above technical problems, the technical solution adopted by the masonry structure of the utility model is: using the above-mentioned refractory prefabricated blocks; including a stainless steel kiln body, on the inner wall of which are arranged a plurality of rows of prefabricated blocks and a plurality of rows of castables; the prefabricated block rows and the castables rows are both arranged along the axial direction of the stainless steel kiln body, and are alternately arranged in a circle along the circumferential direction of the inner wall of the stainless steel kiln body; each row of prefabricated blocks is formed by refractory prefabricated blocks arranged in sequence, the bottom surface of the refractory prefabricated blocks is tightly attached to the inner wall of the stainless steel kiln body, the side protrusions are uniformly facing inward or outward, and the side protrusions of the refractory prefabricated blocks are inserted into the side grooves of adjacent refractory prefabricated blocks.
[0009] Furthermore, the bottom width of the castable row is 0.8 to 1.2 times the bottom width of the prefabricated block row.
[0010] Furthermore, it also includes anchor nails; each row of castables is provided with a plurality of anchor nails, and one end of the anchor nail is fixedly connected to the inner wall of the stainless steel kiln body.
[0011] Furthermore, the anchor nail is a V-shaped or Y-shaped structure, and the bottom end of the anchor nail is fixedly connected to the inner wall of the stainless steel kiln body.
[0012] The beneficial effects of adopting the above technical solution are: the refractory prefabricated block of the utility model has a simple structure and is easy to prepare. The rotary kiln refractory after masonry has strong impact and erosion resistance, which can increase the service life of the rotary kiln refractory.
[0013] The masonry structure of the utility model is simple in structure and easy to construct. The masonry rotary kiln refractory material has strong impact resistance and erosion resistance, can avoid continuous damage to the rotary kiln refractory material, effectively extend the service life of the rotary kiln refractory material, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0015] Figure 1 It is a front view of the refractory prefabricated block of the utility model;
[0016] Figure 2 It is a left view of the refractory prefabricated block of the utility model;
[0017] Figure 3 It is a right side view of the refractory prefabricated block of the utility model;
[0018] Figure 4 It is a top view of the refractory prefabricated block of the utility model;
[0019] Figure 5 It is a structural schematic diagram of the masonry structure of the utility model;
[0020] Figure 6 yes Figure 5 A partial enlarged view of part A in the middle.
[0021] In the figure: prefabricated block body 1, front groove 2, side protrusion 3, back groove 4, side groove 5, anchor 6, castable row 7, stainless steel kiln body 8, anchor nails 9, prefabricated block row 10. DETAILED DESCRIPTION
[0022] Figure 1-Figure 4 As shown, the refractory prefabricated block of the vanadium extraction rotary kiln includes a prefabricated block body 1, which is a cube, a cuboid or a long trapezoidal structure, and is provided with a front groove 2, a side protrusion 3, a back groove 4, a side groove 5 and an anchor 6. The front groove 2 is located in the middle and lower part of the front of the prefabricated block body 1, and horizontally penetrates the front of the prefabricated block body 1; the front groove 2 is preferably located in the range of 1 / 4 to 1 / 2 of the height of the prefabricated block body 1, that is, the lower edge of the front groove 2 shall not be lower than 1 / 4 of the height of the prefabricated block body 1, and the upper edge of the front groove 2 shall not be higher than 1 / 2 of the height of the prefabricated block body 1. The back groove 4 is located in the middle and upper part of the back of the prefabricated block body 1, preferably in the range of 1 / 2 to 3 / 4 of the height of the prefabricated block body 1, and horizontally penetrates the back of the prefabricated block body 1. The side groove 5 is located in the middle and upper part of the side of the prefabricated block body 1, preferably in the range of 1 / 2 to 3 / 4 of the height of the prefabricated block body 1 and at the same level as the back groove 4, and transversely penetrates the side of the prefabricated block body 1. The side protrusion 3 is located in the middle and upper part of the other side opposite to the side groove 5, and transversely penetrates the side of the prefabricated block body 1; the size of the side protrusion 3 matches the side groove 5, and the height is at the same height as the side groove 5, so that the side protrusion 3 of the adjacent refractory prefabricated blocks can be tightly combined with the side groove 5. There are at least two anchors 6, which are fixed to the bottom of the front and back of the prefabricated block body 1. The front groove 2, the back groove 4 and the side groove 5 are preferably grooves with semicircular cross-sections, and the side protrusion 3 is preferably a protrusion with a semicircular cross-section.
[0023] Figure 5 , Figure 6As shown, the masonry structure of the vanadium extraction rotary kiln adopts the above-mentioned refractory prefabricated blocks, including a stainless steel kiln body 8; the stainless steel kiln body 8 is a cylindrical structure, with the kiln head and the kiln tail as the axial direction, the kiln head as the inner side, and the kiln tail as the outer side. A plurality of rows of prefabricated block rows 10 and a plurality of rows of castable material rows 7 are arranged on the inner wall of the stainless steel kiln body 8; each row of prefabricated block rows 10 forms a row from the inside to the outside along the axial direction of the stainless steel kiln body 8, and each row of castable material rows 7 forms a row from the inside to the outside along the axial direction of the stainless steel kiln body 8; the prefabricated block rows 10 and the castable material rows 7 are alternately arranged in a circle along the circumferential direction of the inner wall of the stainless steel kiln body 8; the side of the prefabricated block rows 10 and the castable material rows 7 that are close to the inner wall of the stainless steel kiln body 8 is the bottom surface, and the bottom surface width of the castable material row 7 is 0.8 to 1.2 times the bottom surface width of the prefabricated block row 10, and it is best that the bottom surface width of the castable material row 7 is the same as the bottom surface width of the prefabricated block row 10. Figure 6 As shown, the prefabricated block row 10 is composed of refractory prefabricated blocks arranged in sequence, the bottom surface of the refractory prefabricated block is close to the inner wall of the stainless steel kiln body 8, and the two side surfaces of the refractory prefabricated block face the inner and outer sides of the stainless steel kiln body 8; the side protrusions 3 of the refractory prefabricated blocks in each row of prefabricated blocks 10 are uniformly facing the inner side or the outer side of the stainless steel kiln body 8, for example Figure 5 The side protrusions 3 face the outside of the stainless steel kiln body 8 uniformly; in each row of prefabricated blocks 10, the side protrusions 3 of the refractory prefabricated blocks are inserted into the side grooves 5 of the adjacent refractory prefabricated blocks; in this way, the refractory prefabricated blocks form a long strip of prefabricated block rows 10 along the axial direction, and the front grooves 2 and the back grooves 4 are located on both sides of the prefabricated block rows 10. The castable row 7 is casted with castables, and during the casting process, the castables enter the front grooves 2 and the back grooves 4 in the adjacent prefabricated block rows 10, so that the castables and the refractory prefabricated blocks are integrated and more firmly.
[0024] Figure 6 As shown, the masonry structure of the vanadium extraction rotary kiln also includes anchor nails 9; the anchor nails 9 are fixedly connected to the inner wall of the stainless steel kiln body 8 and are arranged in the castable row 7. It is best to arrange a plurality of anchor nails 9 from the inside to the outside in each row of castable row 7. The anchor nails 9 are preferably V-shaped or Y-shaped structures, and the bottom end of the anchor nail 9 is fixedly connected to the inner wall of the stainless steel kiln body 8; the tip of the V-shaped anchor nail is the bottom end of the anchor nail, and the vertical end of the Y-shaped anchor nail is the bottom end of the anchor nail. Example
[0025] Figure 1-Figure 4As shown, the rotary kiln has a diameter of 3600mm, the top width of the prefabricated block body 1 is 235mm, the bottom width is 235mm, the length is 500mm, and the height is 240mm. The front groove 2 and the back groove 4 are both 500mm long, 30mm wide, and 15mm deep; the side groove 5 is 235mm long, 30mm wide, and 15mm deep; the side groove 5 is 235mm long, 30mm wide, and 15mm high; the anchor 6 has a diameter of 10mm and a length of 40mm, and there are four of them, which are located on both sides of the lower front part and the lower back part of the prefabricated block body 1.
[0026] Figure 5 and Figure 6 As shown, the masonry construction line of the refractory prefabricated blocks is drawn on the kiln body according to the number of masonry rows of the refractory prefabricated blocks. The construction direction is from the middle of the kiln body to the kiln head and the kiln tail at the same time. The diameter of the rotary kiln is 3600mm and the circumference is 11304mm. According to the bottom width of the refractory prefabricated block of 235mm, the circumference is divided into 48 parts, that is, 24 rows of prefabricated row 7 and 24 rows of castable row 10. Draw the construction line accordingly.
[0027] The refractory prefabricated block is made of low-cement mullite castable material and is cast by low-cement mullite castable material.
[0028] When the prefabricated block row 10 is laid, the refractory prefabricated blocks are cleaned in advance, and an appropriate amount of high-strength mud is applied between the refractory prefabricated blocks and the kiln body 8, and the mud is full. After the anchor 6 is welded with a stainless steel welding rod, the refractory prefabricated blocks at the back are laid, and one end of the refractory prefabricated block is tapped with a hammer to make the protrusion 5 of the refractory prefabricated block and the groove 3 of the adjacent refractory prefabricated block tightly combined, preferably with mud extrusion, and the seam between the refractory prefabricated blocks is less than 3mm.
[0029] Anchor nails 9 are welded between adjacent prefabricated block rows 1 in parallel to the circumferential direction of the rotary kiln. Stainless steel welding rods are used for welding. The weld is full and the anchor nails 9 must be wrapped with black tape.
[0030] After welding is completed, the casting zone between the prefabricated block rows 10 is cleaned, and low-cement mullite and binder are added into the mixer. After being fully mixed, the material is discharged and poured for construction.
[0031] The stirred castable is poured into the casting belt, and its height should be higher than the height of the refractory prefabricated block. Sufficient material is added at one time to avoid stratification caused by too long intervals. During the vibration process, the vibrating rod slowly moves or pulls out the material surface to prevent holes from being left behind. The surface of the working layer after vibration is manually smoothed to form a castable row 7. During the pouring process, the front groove 2 and the back groove 4 are fully filled with castables to combine the castables with the refractory prefabricated block into a whole.
[0032] After adopting such a structure, the entire masonry structure becomes a whole, which improves the impact and erosion resistance of the rotary kiln refractory material.
Claims
1. A refractory prefabricated block for a vanadium extraction rotary kiln, characterized in that: The invention comprises a prefabricated block body (1), and a front groove (2), a side protrusion (3), a back groove (4), a side groove (5), and an anchor (6) arranged on the prefabricated block body (1); the front groove (2) is located at the middle and lower part of the front of the prefabricated block body (1) and horizontally penetrates the front of the prefabricated block body (1); the back groove (4) is located at the middle and upper part of the back of the prefabricated block body (1) and horizontally penetrates the back of the prefabricated block body (1); the side groove (5) is located at the middle and upper part of the side of the prefabricated block body (1) and horizontally penetrates the side of the prefabricated block body (1); the side protrusion (3) is located at the middle and upper part of the other side and horizontally penetrates the side of the prefabricated block body (1); the size of the side protrusion (3) matches the side groove (5) and the height is at the same height as the side groove (5); at least two anchors (6) are fixedly connected to the bottom of the front and back of the prefabricated block body (1).
2. The refractory prefabricated block for vanadium extraction rotary kiln according to claim 1, characterized in that: The back groove (4) and the side groove (5) are at the same level.
3. The refractory prefabricated block for vanadium extraction rotary kiln according to claim 2, characterized in that: The heights of the side protrusions (3), the back grooves (4) and the side grooves (5) are all within a range of 1 / 2 to 3 / 4 of the height of the prefabricated block body (1); and the front grooves (2) are within a range of 1 / 4 to 1 / 2 of the height of the prefabricated block body (1).
4. A vanadium extraction rotary kiln masonry structure, using the refractory prefabricated block according to claim 1, 2 or 3, characterized in that: The invention comprises a stainless steel kiln body (8), wherein a plurality of rows of prefabricated blocks (10) and a plurality of rows of castable materials (7) are arranged on the inner wall of the stainless steel kiln body (8); the rows of prefabricated blocks (10) and the rows of castable materials (7) are arranged along the axial direction of the stainless steel kiln body (8), and are alternately arranged in a circle along the circumferential direction of the inner wall of the stainless steel kiln body (8); each row of prefabricated blocks (10) is formed by sequentially arranging refractory prefabricated blocks, the bottom surface of the refractory prefabricated blocks is closely attached to the inner wall of the stainless steel kiln body (8), the side protrusions (3) are uniformly facing inward or outward, and the side protrusions (3) of the refractory prefabricated blocks are inserted into the side grooves (5) of the adjacent refractory prefabricated blocks.
5. The vanadium extraction rotary kiln masonry structure according to claim 4, characterized in that: The bottom surface width of the casting material row (7) is 0.8 to 1.2 times the bottom surface width of the prefabricated block row (10).
6. The vanadium extraction rotary kiln masonry structure according to claim 4, characterized in that: It also includes anchoring nails (9); a plurality of anchoring nails (9) are provided in each row of castable material (7), and one end of the anchoring nail (9) is fixedly connected to the inner wall of the stainless steel kiln body (8).
7. The vanadium extraction rotary kiln masonry structure according to claim 6, characterized in that: The anchoring nail (9) is of a V-shaped or Y-shaped structure, and the bottom end of the anchoring nail (9) is fixedly connected to the inner wall of the stainless steel kiln body (8).