阅读说明：本技术 一种高温石灰回转窑用复合预制件内衬的制备方法 (Preparation method of composite prefabricated part lining for high-temperature lime rotary kiln ) 是由 傅修文 鲍石鹏 李畅 王秀 马朋朋 于 2020-07-18 设计创作，主要内容包括：一种高温石灰回转窑用复合预制件内衬的制备方法,属于耐火材料生产设备技术领域。其特征在于包含如下步骤：(1)称量置备原材料；(2)将置备好的原材料分类投入物料粉碎机,通过物料分别按照要求粉碎至所需粒径,而后混炼均匀,加入占原材料总重4-6wt%的水,在常温5-25摄氏度的环境中搅拌均匀；(3)将加水搅拌好的混合物料在模型中浇筑成型,得到坯料；(4)低温烘烤坯料直至定型,即可。本发明利用镁铬砂及镁铝尖晶石制备回转窑内衬,具备耐高温抗侵蚀和耐磨性好且不结圈的特性,解决了高温石灰回转窑内衬不耐侵蚀、冲刷使用寿命低的问题,提高了生产效率。(A preparation method of a composite prefabricated part lining for a high-temperature lime rotary kiln belongs to the technical field of refractory material production equipment. The method is characterized by comprising the following steps: (1) weighing and preparing raw materials; (2) the prepared raw materials are put into a material crusher in a classified mode, the materials are crushed into required particle sizes according to requirements respectively, then the particles are mixed uniformly, water accounting for 4-6wt% of the total weight of the raw materials is added, and the mixture is stirred uniformly at the normal temperature of 5-25 ℃; (3) pouring and forming the mixed material which is stirred by adding water in a model to obtain a blank; (4) and (5) baking the blank at low temperature until the blank is shaped. The method for preparing the rotary kiln lining by using the magnesia-chromite sand and the magnesia-alumina spinel has the characteristics of high temperature resistance, corrosion resistance, good wear resistance and no ring formation, solves the problems of corrosion resistance and low scouring service life of the high-temperature lime rotary kiln lining, and improves the production efficiency.)

1. A preparation method of a composite prefabricated part lining for a high-temperature lime rotary kiln is characterized by comprising the following steps:

(1) weighing and preparing raw materials;

(2) the prepared raw materials are put into a material crusher in a classified mode, the materials are crushed into required particle sizes according to requirements respectively, then the particles are mixed uniformly, water accounting for 4-6wt% of the total weight of the raw materials is added, and the mixture is stirred uniformly at the normal temperature of 5-25 ℃;

(3) pouring and forming the mixed material which is stirred by adding water in a model to obtain a blank;

(4) baking the blank at low temperature until the blank is shaped;

the raw materials in the step (1) comprise the following components in parts by weight:

10-20 parts of bauxite-based magnesium aluminate spinel particles with the particle size of 10-5 mm;

10-20 parts of bauxite-based magnesium aluminate spinel particles with the particle size of 5-3 mm;

10-20 parts of magnesia-chrome sand particles with the particle size of 3-1 mm;

5-15 parts of magnesia-chrome sand particles with the particle size of 1-0 mm;

5-10 parts of magnesia particles with the particle size of 1-0mm

5-10 parts of bauxite-based magnesium aluminate spinel fine powder with the fineness of 200 meshes;

5-10 parts of magnesia fine powder with the fineness of 200 meshes;

2-6 parts of composite micro powder;

2-6 parts of a binding agent.

2. The preparation method of the composite prefabricated part lining for the high-temperature lime rotary kiln, which is characterized by comprising the following steps of: the magnesia-chrome sand particles comprise the following chemical components in parts by weight:

Cr₂O₃10-20 parts;

60-75 parts of MgO;

1-5 parts of CaO;

Al₂O₃5-10 parts;

Fe₂O₃3-10 parts;

and the rest 1-5%.

3. The preparation method of the composite prefabricated part lining for the high-temperature lime rotary kiln, which is characterized by comprising the following steps of: the bauxite-based magnesium-aluminum particles and the fine powder comprise the following chemical components in parts by mass:

Al₂O₃55-75 parts;

20-35 parts of MgO.

4. The preparation method of the composite prefabricated part lining for the high-temperature lime rotary kiln, which is characterized by comprising the following steps of: the composite micro powder comprises the following components in parts by weight:

α- Al₂O₃3-10 parts of micro powder;

1-8 parts of silicon micropowder;

5-15 parts of a high-efficiency polycarboxylic acid water reducing agent or tripolyphosphate or hexametaphosphate.

5. The preparation method of the composite prefabricated part lining for the high-temperature lime rotary kiln, which is characterized by comprising the following steps of: the binding agent is aluminate cement.

6. The preparation method of the composite prefabricated part lining for the high-temperature lime rotary kiln, which is characterized by comprising the following steps of: and (4) baking at the low temperature of 400 ℃.

7. The preparation method of the composite prefabricated part lining for the high-temperature lime rotary kiln, which is characterized by comprising the following steps of: the material crusher comprises a grinding outer shell, the grinding outer shell comprises a feeding shell, a grinding shell and a discharging shell, the feeding shell, the grinding shell and the discharging shell are sequentially connected together from top to bottom, a main cavity body and an auxiliary cavity body are arranged in the feeding shell, a crankshaft is transversely arranged in the main cavity body, a front end shaft of the crankshaft is mounted on the side wall of the main cavity body through a bearing seat, a rear end shaft of the crankshaft is connected with a crankshaft driving motor, and the crankshaft driving motor is fixed on the side wall of the other side of the main cavity body; the crankshaft comprises at least three connecting rod journals; the auxiliary cavity is communicated with the feeding shell; the feeding shell is in a funnel shape with a large upper part and a small lower part;

more than three material grinding sub-cavities are longitudinally arranged in the material grinding shell; the upper end of each material grinding subchamber is provided with an annular inner convex ring, a plurality of outer wall grinding bar edges are longitudinally arranged on the inner convex ring, a grinding connecting rod is arranged in each material grinding subchamber, the upper end of the grinding connecting rod is hinged on a connecting rod shaft neck, the lower end of the grinding connecting rod is connected with a grinding ball, the grinding ball is positioned at the lower end of the inner concave ring, and a plurality of ball grinding bar edges are arranged on the outer peripheral wall of the grinding ball; the gap between the grinding ball and the side wall of the material grinding sub-cavity is smaller than the particle size of the final required particles of the material;

when the crankshaft driving motor drives the crankshaft to rotate, each grinding connecting rod can be driven to vertically move up and down, and then each grinding ball is driven to vertically move, so that the ball grinding strip edges and the outer wall grinding strip edges are matched to grind and crush materials falling from the upper side.

8. The method for preparing the composite prefabricated part lining for the high-temperature lime rotary kiln, according to claim 7, is characterized in that: the grinding ball rotating driving device is arranged below the grinding balls in the grinding material sub-cavity; the grinding connecting rod comprises an upper connecting rod body and a lower connecting rod body, the upper connecting rod body and the lower connecting rod body are coaxially and rotatably connected, and the lower end of the lower connecting rod body is fixedly connected with the grinding ball into a whole; a strip-shaped screw hole is formed upwards from the lower part of the grinding ball and extends upwards into the lower connecting rod body; the grinding ball rotation driving device comprises a fixed sieve tray, the fixed sieve tray is horizontally fixed below the material grinding sub-cavity, and sieve holes are formed in the fixed sieve tray; vertically fixing a rotary driving screw shaft at the central part above the fixed sieve tray, and inserting the upper end of the rotary driving screw shaft into the strip-shaped screw hole; when the grinding connecting rod moves up and down, the lower connecting rod body and the grinding balls can rotate along the rotary driving lead screw to move up and down, and then the grinding strip edges of the ball bodies rotate to grind materials.

9. The method for preparing the composite prefabricated part lining for the high-temperature lime rotary kiln according to claim 8, is characterized in that: the grinding ball rotation driving device further comprises a sealing dust-blocking structure, the sealing dust-blocking structure comprises a silica gel dust-blocking ring and a silica gel telescopic dust-blocking pipe, the silica gel dust-blocking ring is in a horn mouth shape with a small upper part and a large lower part, the upper end of the silica gel dust-blocking ring is coaxially fixed on the lower part of the grinding ball, and the lower end of the silica gel dust-blocking ring is provided with an inwards concave annular outer blocking edge; the flexible dirt guard pipe of silica gel pipe suit is on the rotation drive lead screw, and the lower extreme of the flexible dirt guard pipe of silica gel connects fixed sieve dish, keeps off along in the upper end setting of the flexible dirt guard pipe of silica gel turns up the annular, keep off along with the annular in the annular outside keep off along the lock fixed together, when grinding ball rotatory removal from top to bottom, keep off along and the annular outside keeps off along can not unhook in the annular.

10. The method for preparing the composite prefabricated part lining for the high-temperature lime rotary kiln, according to claim 9, is characterized in that: the feeding shell comprises a funnel cavity and a straight pipe cavity which are coaxially arranged from top to bottom;

a flexible material shaking device is arranged in a straight pipe cavity of a feeding shell, and comprises a material shaking driving motor, a transmission rotating shaft, a material shaking motor mounting bracket, a plurality of flexible wear-resistant rubber material guide pipes and a plurality of vibrating rings; a plurality of material guide cylinders are arranged in the feeding shell, and each material guide cylinder is vertically connected with each material grinding sub-cavity below the material guide cylinder in a penetrating way; the rubber material guide pipe is arranged in the material guide cylinder, and the vibration ring is sleeved outside the rubber material guide pipe; the adjacent vibrating rings are connected through a vibrating connecting rod, and a vibrating spring is sleeved on the vibrating connecting rod between the adjacent material guide cylinders; the material shaking driving motor and the transmission rotating shaft are both arranged on the outer wall of the feeding shell through a material shaking motor mounting frame, a driving gear is arranged at the upper end of a motor shaft of the material shaking driving motor, a driven gear is arranged at the upper end of the transmission rotating shaft, and the driving gear and the driven gear are meshed with each other; the lower end of the transmission rotating shaft is connected with one end of a fixed folding rod, the other end of the folding rod is connected with a driving connecting rod, and the driving connecting rod is connected with an adjacent vibration ring;

a funnel-shaped rotating lining is arranged in the funnel cavity, and a plurality of material guide strips are arranged on the inner wall of the rotating lining along the direction of a bus; the lower end of the rotating lining is arranged in the funnel cavity through a dustproof bearing, and a lining driving outer gear ring is arranged on the periphery of the upper end of the rotating lining; a meshing through hole is formed in the side wall of the funnel cavity, and the driving gear is embedded into the meshing through hole and meshed with the lining driving outer gear ring; when the material shaking driving motor drives the driving gear to rotate, the rotating lining can be synchronously driven to rotate in the funnel cavity.

Technical Field

The invention belongs to the technical field of refractory material production equipment, and particularly relates to a preparation method of a composite prefabricated part lining for a high-temperature lime rotary kiln.

Background

At present, the lime rotary kiln at home generally adopts alumina-silica calcined bricks or prefabricated parts as linings, calcium oxide and alumina can react to generate various low-melting phase substances such as calcium aluminate CA-C7A12 and the like on a high-temperature lime kiln at the temperature of above 1450 ℃ under the condition of calcium enrichment, the working linings are damaged quickly under the scouring of high-temperature airflow and lime, the service life is greatly reduced, and the refractory materials are not suitable for the trend of reducing the lime raw burning rate of the high-temperature lime rotary kiln before. Therefore, a rotary kiln lining refractory material with good erosion resistance and erosion resistance is needed to solve the above problems, and is also suitable for the national environmental protection and energy saving policy. In order to improve the erosion resistance and scouring resistance of the rotary kiln lining, magnesium-aluminum-chromium and magnesium-iron-chromium spinel materials are introduced for composite prefabrication.

In view of the above, the applicant designs a preparation method of a composite prefabricated part lining for a high-temperature lime rotary kiln, the magnesia-chromite sand and the magnesia-alumina spinel are used for preparing the rotary kiln lining, the rotary kiln lining has the characteristics of high temperature resistance, corrosion resistance, good wear resistance and no ring formation, the problems of corrosion resistance and low scouring service life of the high-temperature lime rotary kiln lining are solved, and the production efficiency is improved.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a preparation method of a composite prefabricated part lining for a high-temperature lime rotary kiln, wherein the magnesia-chromite sand and magnesia-alumina spinel are used for preparing the rotary kiln lining, so that the rotary kiln lining has the characteristics of high temperature resistance, corrosion resistance, good wear resistance and no ring formation, the problems of no corrosion resistance and low scouring service life of the high-temperature lime rotary kiln lining are solved, and the production efficiency is improved.

In order to solve the technical problems, the technical scheme of the invention is as follows: the method is characterized by comprising the following steps:

(1) weighing and preparing raw materials;

(2) the prepared raw materials are put into a material crusher in a classified mode, the materials are crushed into required particle sizes according to requirements respectively, then the particles are mixed uniformly, water accounting for 4-6wt% of the total weight of the raw materials is added, and the mixture is stirred uniformly at the normal temperature of 5-25 ℃;

(3) pouring and forming the mixed material which is stirred by adding water in a model to obtain a blank;

(4) baking the blank at low temperature until the blank is shaped;

the raw materials in the step (1) comprise the following components in parts by weight:

10-20 parts of bauxite-based magnesium aluminate spinel particles with the particle size of 10-5 mm;

10-20 parts of bauxite-based magnesium aluminate spinel particles with the particle size of 5-3 mm;

10-20 parts of magnesia-chrome sand particles with the particle size of 3-1 mm;

5-15 parts of magnesia-chrome sand particles with the particle size of 1-0 mm;

5-10 parts of magnesia particles with the particle size of 1-0mm

5-10 parts of bauxite-based magnesium aluminate spinel fine powder with the fineness of 200 meshes;

5-10 parts of magnesia fine powder with the fineness of 200 meshes;

2-6 parts of composite micro powder;

2-6 parts of a binding agent.

Preferably, the magnesia-chrome sand particles comprise the following components in parts by weight:

Cr₂O₃10-20 parts;

60-75 parts of MgO;

1-5 parts of CaO;

Al₂O₃5-10 parts;

Fe₂O₃3-10 parts;

and the rest 1-5%.

Preferably, the bauxite-based magnesium-aluminum particles and the fine powder comprise the following chemical components in parts by mass:

Al₂O₃55-75 parts;

20-35 parts of MgO;

preferably, the composite micro powder comprises the following components in parts by weight:

α- Al₂O₃3-10 parts of micro-powder,

1-8 parts of silicon micro-powder,

5-15 parts of a high-efficiency polycarboxylic acid water reducing agent or tripolyphosphate or hexametaphosphate.

Preferably, the binding agent is aluminate cement.

Preferably, the low-temperature baking in the step (4) is 400 ℃.

Preferably, the material crusher comprises an outer milling machine shell, the outer milling machine shell comprises a feeding shell, a milling shell and a discharging shell, the feeding shell, the milling shell and the discharging shell are sequentially connected together from top to bottom, a main cavity and an auxiliary cavity are arranged in the feeding shell, a crankshaft is transversely arranged in the main cavity, a front end shaft of the crankshaft is mounted on the side wall of the main cavity through a bearing seat, a rear end shaft of the crankshaft is connected with a crankshaft driving motor, and the crankshaft driving motor is fixed on the side wall of the other side of the main cavity; the crankshaft comprises at least three connecting rod journals; the auxiliary cavity is communicated with the feeding shell; the feeding shell is in a funnel shape with a large upper part and a small lower part;

more than three material grinding sub-cavities are longitudinally arranged in the material grinding shell; the upper end of each material grinding subchamber is provided with an annular inner convex ring, a plurality of outer wall grinding bar edges are longitudinally arranged on the inner convex ring, a grinding connecting rod is arranged in each material grinding subchamber, the upper end of the grinding connecting rod is hinged on a connecting rod shaft neck, the lower end of the grinding connecting rod is connected with a grinding ball, the grinding ball is positioned at the lower end of the inner concave ring, and a plurality of ball grinding bar edges are arranged on the outer peripheral wall of the grinding ball; the gap between the grinding ball and the side wall of the material grinding sub-cavity is smaller than the particle size of the final required particles of the material;

when the crankshaft driving motor drives the crankshaft to rotate, each grinding connecting rod can be driven to vertically move up and down, and then each grinding ball is driven to vertically move, so that the ball grinding strip edges and the outer wall grinding strip edges are matched to grind and crush materials falling from the upper side.

Preferably, the grinding device also comprises a grinding ball rotation driving device which is arranged below the grinding balls in the grinding material sub-cavity; the grinding connecting rod comprises an upper connecting rod body and a lower connecting rod body, the upper connecting rod body and the lower connecting rod body are coaxially and rotatably connected, and the lower end of the lower connecting rod body is fixedly connected with the grinding ball into a whole; a strip-shaped screw hole is formed upwards from the lower part of the grinding ball and extends upwards into the lower connecting rod body; the grinding ball rotation driving device comprises a fixed sieve tray, the fixed sieve tray is horizontally fixed below the material grinding sub-cavity, and sieve holes are formed in the fixed sieve tray; vertically fixing a rotary driving screw shaft at the central part above the fixed sieve tray, and inserting the upper end of the rotary driving screw shaft into the strip-shaped screw hole; when the grinding connecting rod moves up and down, the lower connecting rod body and the grinding balls can rotate along the rotary driving lead screw to move up and down, and then the grinding strip edges of the ball bodies rotate to grind materials.

Preferably, the grinding ball rotation driving device further comprises a sealing dust-blocking structure, the sealing dust-blocking structure comprises a silica gel dust-blocking ring and a silica gel telescopic dust-blocking pipe, the silica gel dust-blocking ring is in a horn mouth shape with a small upper part and a large lower part, the upper end of the silica gel dust-blocking ring is coaxially fixed on the lower part of the grinding ball, and the lower end of the silica gel dust-blocking ring is provided with an inwards concave annular outer blocking edge; the flexible dirt guard pipe of silica gel pipe suit is on the rotation drive lead screw, and the lower extreme of the flexible dirt guard pipe of silica gel connects fixed sieve dish, keeps off along in the upper end setting of the flexible dirt guard pipe of silica gel turns up the annular, keep off along with the annular in the annular outside keep off along the lock fixed together, when grinding ball rotatory removal from top to bottom, keep off along and the annular outside keeps off along can not unhook in the annular.

Preferably, the feeding shell comprises a funnel cavity and a straight pipe cavity which are coaxially arranged from top to bottom;

a flexible material shaking device is arranged in a straight pipe cavity of a feeding shell, and comprises a material shaking driving motor, a transmission rotating shaft, a material shaking motor mounting bracket, a plurality of flexible wear-resistant rubber material guide pipes and a plurality of vibrating rings; a plurality of material guide cylinders are arranged in the feeding shell, and each material guide cylinder is vertically connected with each material grinding sub-cavity below the material guide cylinder in a penetrating way; the rubber material guide pipe is arranged in the material guide cylinder, and the vibration ring is sleeved outside the rubber material guide pipe; the adjacent vibrating rings are connected through a vibrating connecting rod, and a vibrating spring is sleeved on the vibrating connecting rod between the adjacent material guide cylinders; the material shaking driving motor and the transmission rotating shaft are both arranged on the outer wall of the feeding shell through a material shaking motor mounting frame, a driving gear is arranged at the upper end of a motor shaft of the material shaking driving motor, a driven gear is arranged at the upper end of the transmission rotating shaft, and the driving gear and the driven gear are meshed with each other; the lower end of the transmission rotating shaft is connected with one end of a fixed folding rod, the other end of the folding rod is connected with a driving connecting rod, and the driving connecting rod is connected with an adjacent vibration ring;

a funnel-shaped rotating lining is arranged in the funnel cavity, and a plurality of material guide strips are arranged on the inner wall of the rotating lining along the direction of a bus; the lower end of the rotating lining is arranged in the funnel cavity through a dustproof bearing, and a lining driving outer gear ring is arranged on the periphery of the upper end of the rotating lining; a meshing through hole is formed in the side wall of the funnel cavity, and the driving gear is embedded into the meshing through hole and meshed with the lining driving outer gear ring; when the material shaking driving motor drives the driving gear to rotate, the rotating lining can be synchronously driven to rotate in the funnel cavity.

Compared with the prior art, the invention has the beneficial effects that:

1. the high-temperature lime rotary kiln prefabricated part prepared by the process can be mixed with the same material castable for building as a rotary kiln lining, has good erosion resistance and wear resistance, does not form a ring, and improves the service life and production efficiency of the rotary kiln.

2. In the preparation process, as the materials such as the magnesia-chrome sand, the magnesia sand and the like are easy to hydrate to cause the cracks of the precast blocks during drying after casting molding, the magnesia-chrome sand and the magnesia-alumina spinel are mixed and compounded according to certain components, so that the defects that the cracks of the precast blocks are caused by the hydration of the pure magnesia-chrome sand and the magnesia, and the precast blocks are low-melting and not corrosion-resistant due to the high-temperature reaction of the pure magnesia-alumina spinel alumina and calcium oxide are avoided.

3. The process of the invention adopts reasonable raw material proportion, adopts a plurality of raw material mixed ingredients with various particle sizes and fineness, and aims to realize reasonable particle size distribution, form closest packing, reduce porosity and form a compact structure.

The composite micro powder involved in the process has the effects of filling particle gaps, improving the fluidity of the casting material, forming ceramic combination at high temperature to generate high-temperature strength, and simultaneously forming a ceramic structure to prevent liquid phase permeation; in the composite micropowder, alpha-Al₂O₃The micro powder has the function of filling gaps of particles, and is high in activity and easy to sinter at high temperature; the function of adding the high-efficiency polycarboxylic acid water reducing agent or the tripolyphosphate or the hexametaphosphate is to disperse the micro powder, reduce the water adding amount, reduce air holes and improve the compactness of the material; the composite micro powder is organically combined with each component of the composite micro powder, so that the high-temperature sintering performance of the material can be improved.

Drawings

FIG. 1 is a schematic structural view of a material crusher (example II);

FIG. 2 is a schematic view of the structure of the milling chamber and the milling ball;

FIG. 3 is a schematic view of the structure of the milling subchamber and the milling ball in cooperation (example III);

in the figure: 1. a crankshaft; 2. a crankshaft drive motor; 3. rotating the lining; 4. a funnel cavity; 5. a straight lumen; 6. a vibrating ring; 7. a rubber material guide pipe; 8. a vibration link; 9. a vibration spring; 10. grinding and dividing cavities; 11. grinding the ball; 12. a discharging shell; 13. grinding the material shell; 14. an inner collar; 15. a drive link; 16. fixing the folding rod; 17. a material shaking motor mounting rack; 18. a transmission rotating shaft; 19. a material shaking driving motor; 20. a driven gear; 21. a driving gear; 22. a secondary cavity; 23. a bearing seat; 24. a main chamber; 25. a connecting rod journal; 26. grinding the connecting rod; 27. grinding the inner wall into strip edges; 28. grinding the strip edges by using the spheres; 29. a strip-shaped screw hole; 30. rotating the drive screw shaft; 31. an annular inner blocking edge; 32. an annular outer blocking edge; 33. a silica gel telescopic dust blocking pipe; 34. fixing the sieve tray; 66. Silica gel dust ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.