Calcium aluminate cement clinker and alumina cement clinker production method and swing kiln

Abstract

The present invention provides a method for producing calcium aluminate cement clinker and alumina cement clinker and a swing kiln, comprising a kiln body and a sealing assembly, wherein the kiln body is provided with at least one sealing hole, one end of the burner faces the sealing hole, and the kiln body is provided with matching holes on two opposite sides close to the sealing hole; the sealing assembly comprises a first sealing plate connected to the burner, the first sealing plate is slidably connected to the kiln body, and further comprises at least one second sealing plate and a third sealing plate arranged on two opposite sides of the first sealing plate and connected to the first sealing plate; wherein the second sealing plate and the third sealing plate are respectively matched with the matching holes, so that the kiln body is in a swinging state, the second sealing plate and the third sealing plate reciprocate and extend in the matching hole, and the sealing hole is not connected to the outside. In the above manner, the swing kiln provided by the present invention can increase the heating area of ​​the raw materials, thereby improving the production efficiency of the raw materials.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of calcium aluminate cement clinker or aluminate binder, and in particular to a production method and a swing kiln for calcium aluminate cement clinker and alumina cement clinker. Background Art

[0002] Castables are composed of aggregate and matrix powder binder, and CA-80 calcium aluminate cement clinker is one of the commonly used powder binders. At present, there are three main preparation processes for CA-80 calcium aluminate cement clinker: one is the electric melting method; the second is the swing kiln powder burning method; the third is the tunnel kiln brick burning method; among which the swing kiln powder burning method is the most commonly used industrial production process.

[0003] The swing kiln powder burning method is to mix and grind industrial alumina, calcium oxide or calcium carbonate in proportion, and burn them in a swing kiln to obtain calcium aluminate cement. However, in actual production, it is found that the mineral phase of the obtained calcium aluminate cement is not uniform and stable, and the quality is poor. Summary of the invention

[0004] A first object of the present invention is to provide a swing kiln.

[0005] The embodiment of the present invention provides a swing kiln, comprising: a kiln body, with at least one sealing hole, one end of the burner facing the sealing hole, and the kiln body having matching holes on two opposite sides close to the sealing hole;

[0006] The sealing assembly comprises a first sealing plate connected to the burner, the first sealing plate being slidably connected to the kiln body, and at least one second sealing plate and a third sealing plate being arranged on opposite sides of the first sealing plate and connected to the first sealing plate; wherein,

[0007] One end of the second sealing plate and the third sealing plate are respectively matched with the matching holes, so that the kiln body is in a swinging state, the second sealing plate and the third sealing plate reciprocate and extend in the matching holes, and the sealing holes are not connected to the outside, and the first sealing plate swings relative to the kiln body in the opposite direction of the kiln body.

[0008] According to a swing kiln of one embodiment of the present invention, a mounting hole is provided on the first sealing plate, and one end of the burner at least partially extends into the mounting hole, so that when the kiln body is in a swinging state, the first sealing plate swings in the opposite direction to the kiln body.

[0009] According to an embodiment of the swing kiln of the present invention, sliding blocks are provided on opposite sides of the first sealing plate, and the kiln body is provided with sliding grooves adapted to the sliding blocks on opposite sides close to the sealing hole;

[0010] The chute is extended along the circumference of the kiln body.

[0011] According to an embodiment of the swing kiln of the present invention, slide grooves are provided on opposite sides of the first sealing plate, and sliding blocks adapted to the slide grooves are provided on opposite sides of the kiln body close to the slide grooves;

[0012] The sliding block is extended along the circumference of the kiln body.

[0013] According to an embodiment of the swing kiln of the present invention, the matching hole includes a first matching hole and a second matching hole, one end of the second sealing plate is fixedly connected to the first sealing plate and at least partially stacked with the first sealing plate, and the other end is inserted into the first matching hole;

[0014] One end of the third sealing plate is fixedly connected to the first sealing plate and at least partially stacked with the first sealing plate, and the other end of the third sealing plate is inserted into the second matching hole.

[0015] According to an embodiment of the swing kiln of the present invention, the second sealing plate and the third sealing plate are provided with matching sliders on opposite sides, and the kiln body is provided with limiting grooves matching with the matching sliders on opposite sides near the sealing hole; wherein,

[0016] The kiln body is in a rotating state, and the matching sliding block slides back and forth in the limiting groove;

[0017] The limiting groove is extended along the circumference of the kiln body.

[0018] According to an embodiment of the swing kiln of the present invention, the second sealing plate and the third sealing plate are provided with limiting grooves on opposite sides, and matching sliding blocks adapted to the limiting grooves are provided on opposite sides of the kiln body near the sealing hole;

[0019] The matching sliding block is extended along the circumference of the kiln body.

[0020] According to an embodiment of the swing kiln of the present invention, a feed pipe is further provided on the kiln body, a working chamber is provided in the kiln body, and the feed pipe is communicated with the working chamber.

[0021] According to an embodiment of the swing kiln of the present invention, a first support block and a second support block are provided at the bottom of the kiln body, and the first support block and the second support block are used to support the kiln body and can support the swing of the kiln body; wherein,

[0022] The second support block is arranged close to one side of the feed pipe, and the thickness between the top surface and the bottom surface of the second support block is greater than the thickness between the top surface and the bottom surface of the first support block;

[0023] The kiln body is further provided with two mounting ribs in the working chamber, the extending direction of the mounting ribs is the same as the extending direction of the working chamber, and the two mounting ribs are arranged at an angle.

[0024] The second object of the present invention is to provide a method for producing calcium aluminate cement clinker and alumina cement clinker, using the above-mentioned swing kiln, comprising: using a wet pulping and extrusion to obtain a shaped body as a raw material, and sintering it in a one-stage swing kiln or a two-stage swing kiln; wherein,

[0025] The length of the formed body along the diameter direction of the swing kiln cylinder ranges from 1 to 80 mm;

[0026] The uniformity of the molded body is that the difference in moisture content per cubic centimeter is less than 0.5%;

[0027] The temperature field of the swing kiln is as follows: the temperature of the feed preheating section is 100-450°C, the temperature of the middle soaking section is 500-800°C, and the temperature of the outlet sintering section is 1250-1700°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the swing kiln of the present invention;

[0030] Figure 2 for Figure 1 The top view shown;

[0031] Figure 3 for Figure 2 The cross-sectional view at AA is shown;

[0032] Figure 4 for Figure 1 The schematic diagram of the structure of the kiln body in the swing kiln shown;

[0033] Figure 5 for Figure 1 A schematic structural diagram of a sealing assembly of a swing kiln is shown;

[0034] Figure 6 for Figure 3 A schematic structural diagram of another state of the mounting rib 190 is shown.

[0035] Reference numerals:

[0036] 10. kiln body; 110. sealing hole; 120. matching hole; 1210. first matching hole; 1230. second matching hole; 130. slide groove; 140. limit groove; 150. feed pipe; 160. working chamber; 170. first support block; 180. second support block; 190. mounting rib;

[0037] 20. Sealing assembly; 210. First sealing plate; 2110. Mounting hole; 2120. Sliding block; 220. Second sealing plate; 2210. Matching slider; 230. Third sealing plate. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] As one of the specific embodiments of the present invention, the production method of calcium aluminate cement clinker and alumina cement clinker comprises the following steps:

[0040] (1) Wet ball milling slurry:

[0041] Preparation of CA-80 series calcium aluminate cement clinker slurry: add water to industrial alumina, calcium oxide or calcium carbonate, mix and grind to obtain 200-400 mesh slurry.

[0042] The mass ratio of aluminum oxide, calcium oxide or calcium carbonate to water is (78-80):(20-22):(90-100); and the grinding time is 8-24h.

[0043] Preparation of CA-70 series calcium aluminate cement clinker slurry: add water to industrial alumina, calcium oxide or calcium carbonate, mix and grind to obtain 200-400 mesh slurry.

[0044] The mass ratio of aluminum oxide, calcium oxide or calcium carbonate to water is (69-70):(30-31):(90-100); and the grinding time is 8-24h.

[0045] Preparation of CA-50 alumina cement clinker slurry: Add water to high-quality bauxite and limestone, mix and grind to obtain a 200-400 mesh slurry.

[0046] The mass ratio of bauxite, limestone and water is (48-50):(50-52):(90-100); and the grinding time is 8-24h.

[0047] (2) Homogenization:

[0048] The obtained slurry is input into the mud pool for filtration and then homogenized. Specifically, the slurry is stored and filtered in multiple mud pools, and the filtered slurry is simultaneously transported to the filter cloth machine through a plunger pump, and homogenized and mixed during transportation;

[0049] The water content of the slurry after homogenization is controlled to be 40-50%, and the uniformity is such that the difference in water content per cubic centimeter is less than 5%;

[0050] Among them, the pressure fluctuation of the plunger pump is controlled to be less than 1% to ensure continuous and stable transportation and continuous and stable production.

[0051] (3) Dehydration treatment:

[0052] The slurry is further transported to the filter cloth machine for dehydration;

[0053] The moisture content of the slurry after dehydration treatment is controlled to be 15-20%, and the uniformity index reaches a difference of less than 1% in moisture content per cubic centimeter.

[0054] (4) Densification processing:

[0055] The slurry is further transported to the mud kneading machine for further mud refining to further improve the homogenization of the material and increase the density;

[0056] Among them, the density of the material after densification treatment is controlled to be 1.2-1.5g / cm 3 , and the uniformity index reaches a difference of less than 0.5% in moisture content per cubic centimeter, which meets the requirements of extrusion molding for materials.

[0057] (5) Extrusion molding:

[0058] The obtained material is extruded to obtain a shaped body having a diameter of 7-9 mm, a moisture content of 10-12%, a moisture content difference of less than 0.5% per cubic centimeter, and a density of 1.7-2.0 g / cm 3 of cylinder.

[0059] (6) Firing:

[0060] When the length of the cylinder reaches 15-20mm, it will be automatically cut off and continuously transported to the drying kiln. After drying, it will be screened and sent to the swing kiln for firing. After cooling, cement clinker will be obtained.

[0061] The temperature field of the swing kiln is: the temperature of the feed preheating section is 100-450°C, the temperature of the middle soaking section is 500-800°C, and the temperature of the outlet sintering section is 1250-1700°C; the residence time of each stage is 6-8h.

[0062] Further, for CA-80 series calcium aluminate cement clinker, the outlet firing section temperature is 1450-1700°C;

[0063] For CA-70 series calcium aluminate cement clinker, the outlet burning section temperature is 1400~1650℃;

[0064] For CA-50 series alumina cement clinker, the outlet firing section temperature is 1250~1500℃.

[0065] The high-quality cement clinker obtained after calcination is finely ground to obtain cement products of different quality grades.

[0066] Example 1 CA-80 series calcium aluminate cement clinker

[0067] This embodiment provides a method for producing CA-80 series calcium aluminate cement, comprising the following steps:

[0068] (1) Wet ball milling slurry:

[0069] Add 80 kg of aluminum oxide, 20 kg of calcium oxide and 100 kg of water into a wet ball mill and grind for 15 hours to obtain a slurry of 200-400 mesh.

[0070] (2) Homogenization:

[0071] The obtained slurry is input into the mud pool for filtration and then homogenized. Specifically, the slurry is stored and filtered in multiple mud pools, and the filtered slurry is simultaneously transported to the filter cloth machine through a plunger pump, and homogenized and mixed during transportation;

[0072] After homogenization, the moisture content of the slurry is controlled at about 45%, and the uniformity reaches a difference of less than 5% in moisture content per cubic centimeter;

[0073] Among them, the pressure fluctuation of the plunger pump is controlled to be less than 1% to ensure continuous and stable transportation and continuous and stable production.

[0074] (3) Dehydration treatment:

[0075] The slurry is further conveyed to the filter cloth machine for dehydration treatment, and the moisture content in the slurry is controlled to be about 16%, and the uniformity index reaches a difference of less than 1% in moisture content per cubic centimeter.

[0076] (4) Densification processing:

[0077] The slurry is further conveyed to the mud kneading machine for further mud refining to further improve the homogenization of the material and increase the density.

[0078] At this point, the density of the obtained material reaches 1.4-1.5g / cm 3, and the uniformity index reaches a difference of less than 0.5% in moisture content per cubic centimeter, which meets the requirements of extrusion molding for materials.

[0079] (5) Extrusion molding:

[0080] The obtained material is extruded to obtain a shaped body with a diameter of 7-9 mm, a moisture content of about 10%, a moisture content difference of less than 0.5% per cubic centimeter, and a density of 1.8-2.0 g / cm 3 of cylinder.

[0081] (6) Firing:

[0082] When the length of the cylinder obtained by the extrusion molding reaches 20 mm, it will be automatically cut off and continuously transported to the drying kiln, and after drying, it will be screened and sent to the swing kiln, fired, and cooled to obtain cement clinker;

[0083] The temperature field of the swing kiln is: the temperature of the feed preheating section is 100-200°C, the temperature of the middle soaking section is 700-800°C, and the temperature of the outlet sintering section is 1550-1650°C; the residence time of each stage is 6-8h.

[0084] The various indices of the CA-80 calcium aluminate cement obtained by testing are shown in Tables 1 and 2.

[0085] Example 2 CA-80 series calcium aluminate cement clinker

[0086] This embodiment provides a method for producing CA-80 series calcium aluminate cement, comprising the following steps:

[0087] (1) Wet ball milling slurry:

[0088] 78 kg of aluminum oxide, 20 kg of calcium oxide and 90 kg of water were added into a wet ball mill and ground for 16 hours to obtain a slurry with a mesh size of 200-400 and a solid content of 75%.

[0089] (2) Homogenization:

[0090] The obtained slurry is input into the mud pool for filtration and homogenization treatment, specifically: using multiple mud pools to store and filter the mud, and simultaneously transporting the filtered mud to the filter cloth machine through a plunger pump, and homogenizing and mixing it during transportation;

[0091] After homogenization, the moisture content of the slurry is controlled at about 45%, and the uniformity reaches a difference of less than 5% in moisture content per cubic centimeter;

[0092] Among them, the pressure fluctuation of the plunger pump is controlled to be less than 1% to ensure continuous and stable transportation and continuous and stable production.

[0093] (3) Dehydration treatment:

[0094] The slurry is further conveyed to the filter cloth machine for dehydration treatment, and the moisture content in the slurry is controlled to be about 20%, and the uniformity index reaches a difference of less than 1% in moisture content per cubic centimeter.

[0095] (4) Densification processing:

[0096] The slurry is further conveyed to the mud kneading machine for further mud refining to further improve the homogenization of the material and increase the density.

[0097] At this point, the density of the obtained material reaches 1.3-1.4g / cm 3 , and the uniformity index reaches a difference of less than 0.5% in moisture content per cubic centimeter, which meets the requirements of extrusion molding for materials.

[0098] (5) Extrusion molding:

[0099] The obtained material is extruded to obtain a shaped body with a diameter of 7-9 mm, a moisture content of about 12%, a moisture content difference of less than 0.5% per cubic centimeter, and a density of 1.7-1.9 g / cm 3 of cylinder.

[0100] (6) Firing:

[0101] When the length of the cylinder obtained by the extrusion molding reaches 20 mm, it will be automatically cut off and continuously transported to the drying kiln, and after drying, it will be screened and sent to the swing kiln, fired, and cooled to obtain cement clinker;

[0102] The temperature field of the swing kiln is: the temperature of the feed preheating section is 100-150°C, the temperature of the middle soaking section is 600-700°C, and the temperature of the outlet sintering section is 1450-1550°C; the residence time of each stage is 6-8h.

[0103] The various indices of the CA-80 calcium aluminate cement obtained by testing are shown in Tables 1 and 2.

[0104] Example 3 CA-80 series calcium aluminate cement clinker

[0105] This embodiment provides a method for producing CA-80 series calcium aluminate cement, comprising the following steps:

[0106] (1) Wet ball milling slurry:

[0107] Add 79kg of aluminum oxide, 20kg of calcium oxide and 90kg of water into a wet ball mill and grind for 24 hours to obtain a slurry of 200-400 mesh and a solid content of about 70%.

[0108] (2) Homogenization:

[0109] The obtained slurry is input into the mud pool for filtration and homogenization treatment, specifically: using multiple mud pools to store and filter the mud, and simultaneously transporting the filtered mud to the filter cloth machine through a plunger pump, and homogenizing and mixing it during transportation;

[0110] After homogenization, the moisture content of the slurry is controlled at about 45%, and the uniformity reaches a difference of less than 5% in moisture content per cubic centimeter;

[0111] Among them, the pressure fluctuation of the plunger pump is controlled to be less than 1% to ensure continuous and stable transportation and continuous and stable production.

[0112] (3) Dehydration treatment:

[0113] The slurry is further conveyed to the filter cloth machine for dehydration treatment, and the moisture content in the slurry is controlled to be about 20%, and the uniformity index reaches a difference of less than 1% in moisture content per cubic centimeter.

[0114] (4) Densification processing:

[0115] The slurry is further conveyed to the mud kneading machine for further mud refining to further improve the homogenization of the material and increase the density.

[0116] At this point, the density of the obtained material reaches 1.2-1.3g / cm 3 , and the uniformity index reaches a difference of less than 0.5% in moisture content per cubic centimeter, which meets the requirements of extrusion molding for materials.

[0117] (5) Extrusion molding:

[0118] The obtained material is extruded to obtain a molded body with a diameter of 7-9 mm, a moisture content of about 11%, a difference in moisture content per cubic centimeter of less than 0.5%, and a density of 1.8-1.9 g / cm 3 of cylinder.

[0119] (4) Firing:

[0120] When the length of the cylinder obtained by the extrusion molding reaches 20 mm, it will be automatically cut off and continuously transported to the drying kiln, and after drying, it will be screened and sent to the swing kiln for firing, and after cooling, cement clinker will be obtained;

[0121] The temperature field of the swing kiln is: the temperature of the feed preheating section is 100-200°C, the temperature of the middle soaking section is 500-600°C, and the temperature of the outlet sintering section is 1400-1500°C; the residence time of each stage is 6-8h.

[0122] The various indices of the CA-80 calcium aluminate cement obtained by testing are shown in Tables 1 and 2.

[0123] Effect verification 1

[0124] The commercially available dry powder fired CA-80 calcium aluminate cement was used as a comparative example, and the calcium aluminate cement samples obtained in the embodiments and the comparative examples were tested.

[0125] The test standards are as follows:

[0126] GB / T 205--2000 Chemical analysis methods for aluminate cement.

[0127] GB / T 1345--1991 Cement fineness test method.

[0128] GB / T 1346--1989 Test method for water consumption, setting time and stability of cement of standard consistency.

[0129] GB / T 8074--1987 Method for determination of specific surface area of ​​cement.

[0130] GB / T 12573--1990 Cement sampling method.

[0131] The test results are as follows:

[0132] Table 1

[0133]

[0134]

[0135] As can be seen from Table 1, the CA-80 calcium aluminate cement clinker of the present invention has the following characteristics:

[0136] Chemical composition: By mass percentage, Al2O3 content >78%, CaO content between 20-21%, SiO2 content <0.3%, Fe2O3 content <0.15%, MgO content <0.4%.

[0137] Compared with the existing CA-80 calcium aluminate cement clinker, the CA-80 calcium aluminate cement clinker prepared by the method of the present invention has high mineral purity, finer fineness and larger volume specific surface area.

[0138] At the same time, the microstructure of the calcium aluminate cement clinker obtained in Examples 1-3 and Comparative Example 1 was observed, and it was found that the calcium aluminate cement clinker obtained in Examples 1-3 had very consistent internal crystal development, good uniformity, and a uniform and stable mineral phase, and was a high-quality CA-80 calcium aluminate cement clinker. However, the mineral phase of Comparative Example 1 was not uniform and stable, and the quality was poor.

[0139] Table 2

[0140]

[0141] As shown in Table 2, the calcium aluminate cement clinker prepared by the present invention has a higher flexural strength (greater than 6.5 MPa) and a larger bulk density (greater than 1.18 g / cm 3 ), the water requirement is smaller (less than 22%) in actual application, and the time interval between initial setting and final setting is shorter.

[0142] Example 4 CA-70 series calcium aluminate cement clinker

[0143] This embodiment provides a method for producing CA-70 series calcium aluminate cement clinker, which is similar to Embodiment 1, except that:

[0144] (1) Slurry preparation: Add 70 kg of aluminum oxide, 30 kg of calcium oxide, and 100 kg of water into a wet ball mill and grind for 15 h to obtain a slurry of 200-400 mesh.

[0145] (2) The outlet firing section temperature is 1450~1650℃.

[0146] Effect Verification 2

[0147] The commercially available CA-70 calcium aluminate cement clinker fired with dry powder was used as comparative example 2, and the calcium aluminate cement clinker samples obtained in Example 4 and comparative example 2 were tested.

[0148] The test results are as follows:

[0149] Table 3

[0150]

[0151] As shown in Table 3, the CA-70 calcium aluminate cement clinker of the present invention has the following characteristics:

[0152] Chemical composition: By mass percentage, the Al2O3 content is 72-73%, the CaO content is between 26-27%, the SiO2 content is <0.3%, the Fe2O3 content is <0.15%, and the MgO content is <0.4%.

[0153] Compared with the existing CA-70 type calcium aluminate cement clinker, the CA-70 series calcium aluminate cement clinker prepared by the method of the present invention has high mineral purity, finer fineness, and larger volume specific surface area.

[0154] At the same time, the microstructures of the calcium aluminate cement clinkers obtained in Example 4 and Comparative Example 2 were observed, and it was found that the calcium aluminate cement clinker obtained in Example 4 had very consistent internal crystal development, good uniformity, and a uniform and stable mineral phase, and was a high-quality CA-70 calcium aluminate cement clinker. However, the mineral phase of Comparative Example 2 was not uniform and stable, and the quality was poor.

[0155] Table 4

[0156]

[0157] As shown in Table 4, the CA-70 series calcium aluminate cement clinker prepared by the method of the present invention has a higher flexural strength (greater than 6.8 MPa) and a larger bulk density (greater than 1.2 g / cm 3 ), the water requirement is smaller (less than 20%) in actual application, and the time interval between initial setting and final setting is shorter.

[0158] Example 5 CA-50 series alumina cement clinker

[0159] This embodiment provides a method for producing CA-50 series alumina cement clinker, which is similar to Embodiment 1, except that:

[0160] (1) Slurry preparation: 49 kg of bauxite, 51 kg of limestone and 100 kg of water were added into a wet ball mill and ground for 15 h to obtain a slurry of 200-400 mesh.

[0161] (2) The outlet sintering section temperature is 1450~1500℃.

[0162] Effect Verification 3

[0163] The commercially available CA-50 alumina cement clinker fired with dry powder was used as comparative example 3, and the alumina cement clinker samples obtained in Example 4 and comparative example 3 were tested.

[0164] The test results are as follows:

[0165] Table 5

[0166]

[0167] As shown in Table 5, the CA-50 alumina cement clinker of the present invention has the following characteristics:

[0168] Chemical composition: By mass percentage, Al2O3 content is 50%, SiO2 content is <4%, Fe2O3 content is <1.5%, R2O content is <0.3%, and S content is <0.01%.

[0169] Compared with the existing CA-50 alumina cement clinker, the CA-50 alumina cement clinker prepared by the method of the present invention has high mineral purity, finer fineness, and larger volume specific surface area.

[0170] At the same time, the microstructures of the alumina cement clinker obtained in Example 5 and Comparative Example 3 were observed, and it was found that the alumina cement clinker obtained in Example 5 had very consistent internal crystal development, good uniformity, and a uniform and stable mineral phase, and was a high-quality CA-50 alumina cement clinker. However, the mineral phase of Comparative Example 3 was not uniform and stable, and the quality was poor.

[0171] Table 6

[0172]

[0173] It can be seen from Table 6 that the CA-50 alumina cement clinker prepared by the method of the present invention has a higher flexural strength (greater than 13 MPa), and the time interval between initial setting and final setting is shorter.

[0174] Although the present invention has been described in detail herein with general descriptions and specific embodiments, some modifications or improvements may be made to the present invention, including changes in the name, such as calcium aluminate binder or aluminate binder; this is obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention, whether dry grinding or wet grinding, as long as the extrusion (mechanical) molding, the size of the molded body ranges from 1 to 80 mm, the shape includes various shapes such as cubes, spheres, cylinders, rhombuses, etc., and after swing kiln firing or swing kiln two-stage firing, all belong to the scope of protection claimed by the present invention.

[0175] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 1 It is a structural schematic diagram of an embodiment of the swing kiln of the present invention, Figure 2 for Figure 1 The top view shown, Figure 3 for Figure 2 The cross-sectional view at AA is shown. Figure 4 for Figure 1 The structural diagram of the kiln body in the swing kiln is shown in FIG. Figure 5 for Figure 1 The present invention also provides a swing kiln used in the above method, the swing kiln comprising a kiln body 10 and a sealing assembly 20, the kiln body 10 is provided with at least one sealing hole 110, one end of the burner is facing the sealing hole 110, and the kiln body 10 is provided with matching holes 120 on two opposite sides close to the sealing hole 110. The sealing assembly 20 comprises a first sealing plate 210 connected to the burner, the first sealing plate 210 is slidably connected to the kiln body 10, and also comprises at least one second sealing plate 220 and a third sealing plate 230 arranged on two opposite sides of the first sealing plate 210 and connected to the first sealing plate 210. The second sealing plate 220 and the third sealing plate 230 are respectively matched with the matching hole 120, so that the kiln body 10 is in a swinging state, the second sealing plate 220 and the third sealing plate 230 reciprocate and extend in the matching hole 120, and the sealing hole 110 is not communicated with the outside, and the first sealing plate 210 swings relative to the kiln body 10 in the opposite direction of the swing of the kiln body 10.

[0176] It should be noted that, in one embodiment of the present invention, the number of the second sealing plate 220 and the third sealing plate 230 can be one, for example Figure 4 and Figure 5 As shown in , that is, a second sealing plate 220 and a third sealing plate 230 may be disposed on both sides of each first sealing plate 210. It is understandable that the number of the second sealing plates 220 and the third sealing plates 230 may also be 2, 3 or 4, etc., respectively, which is not limited here. Figure 1 and Figure 2 As shown in , the number of the second sealing plate 220 and the third sealing plate 230 can be 3 respectively. Similarly, other numbers of the second sealing plates 220 and the third sealing plates 230 can also be provided, which are not shown in the figure here. In one embodiment of the present invention, the material of the first sealing plate 210, the second sealing plate 220 and the third sealing plate 230 is a carbon fiber material. In other embodiments, it can also be other high temperature and heat-resistant materials, which are not limited here.

[0177] When the swing kiln swings back and forth at a certain angle, for example, 120 degrees, that is, the swing amplitude of the kiln body 10 is 60 degrees to the left and right. In one embodiment of the present invention, the burner arranged on the top of the swing kiln is not fixedly connected to the kiln body 10, that is, the swing of the swing kiln 10 will not drive the burner to swing together, so that the first sealing plate 210 connected to the burner will swing in the opposite direction of the swing of the kiln body 10. In this way, it can be avoided that the spraying area of ​​the burner is limited to the area corresponding to the burner in the kiln body 10. Because when the kiln body 10 swings, the burner is in a stationary state, and then within the swing range of the kiln body 10, the area sprayed by the burner will also change accordingly, thereby expanding the heating area of ​​the raw materials in the kiln body 10. When the first sealing plate 210 swings, the second sealing plate 220 and the third sealing plate 230 will reciprocate in the matching hole 120, and at the same time, the first sealing plate 210, the second sealing plate 220 and the third sealing plate 230 will completely cover the sealing hole 110, so that the sealing hole 110 is not connected to the outside. In this way, the fuel such as the gas entering the kiln body 10 through the burner will not be scattered to the outside, thereby improving the utilization rate of the fuel, and increasing the heating area of ​​the material while improving the quality of the material when it is output.

[0178] Please continue to refer to Figure 3 , Figure 4 as well as Figure 5In one embodiment of the present invention, a mounting hole 2110 is provided on the first sealing plate 210, and one end of the burner at least partially extends into the mounting hole 2110, so that the first sealing plate 210 and the kiln body 10 slide relative to each other when the kiln body 10 is in a swinging state. The burner is vertically downward and does not move with the swing of the swing kiln, and at least partially extends into the mounting hole 2110. Then, when the kiln body 10 swings, the first sealing plate 210 is limited by the burner and will swing with the kiln body 10, but the swing direction of the first sealing plate 210 is opposite to the swing direction of the kiln body 10.

[0179] In one embodiment of the present invention, sliding blocks 2120 are provided on opposite sides of the first sealing plate 210, and slide grooves 130 adapted to the sliding blocks 2120 are provided on opposite sides of the kiln body 10 near the sealing hole 110, and the slide grooves 130 are extended along the circumference of the kiln body 10. That is, the sliding block 2120 provided on the first sealing plate 210 can reciprocate along the slide grooves 130, and then when the swing kiln swings, the limit between the burner and the first sealing plate 210 can make the first sealing plate 210 slide along the slide grooves 130 in the opposite direction of the swing kiln. In other embodiments, the slide grooves 130 are provided on opposite sides of the first sealing plate 210, and the kiln body 10 is provided with sliding blocks 2120 adapted to the slide grooves 130 on opposite sides near the slide grooves 130; the sliding blocks 2120 are extended along the circumference of the kiln body 10. When the kiln body 10 swings, the sliding grooves 130 disposed on opposite sides of the first sealing plate 210 and the sliding blocks 2120 disposed on the kiln body 10 cooperate with each other so that the first sealing plate 210 can slide in the opposite direction of the movement of the kiln body 10 .

[0180] The matching hole 120 includes a first matching hole 1210 and a second matching hole 1230. One end of the second sealing plate 220 is fixedly connected to the first sealing plate 210 and at least partially stacked with the first sealing plate 210, and the other end is inserted into the first matching hole 1210; one end of the third sealing plate 230 is fixedly connected to the first sealing plate 210 and at least partially stacked with the first sealing plate 210, and the other end is inserted into the second matching hole 1230. The stacking arrangement of the first sealing plate 210, the second sealing plate 220 and the third sealing plate 230 can improve the heat intensity of the sealing plate when heated, thereby improving the service life of the first sealing plate 210, the second sealing plate 220 and the third sealing plate 230. It can be understood that a sliding mechanism can also be set between the first sealing plate 210 and the second sealing plate 220, so that when the first sealing plate 210 moves, the second sealing plate 220 will also slide relatively with the first sealing plate 210, that is, the overlapping area between the first sealing plate 210 and the second sealing plate 220 is controlled. Similarly, the stacking area between the first sealing plate 210 and the third sealing plate 230 may also be controlled so that the third sealing plate 230 is slidably connected to the first sealing plate 210 .

[0181] It should be noted that, in one embodiment of the present invention, the second sealing plate 220 and the third sealing plate 230 are provided with matching sliders 2210 on opposite sides, and the kiln body 10 is provided with limiting grooves 140 matching the matching sliders 2210 on opposite sides near the sealing hole 110. Among them, when the kiln body 10 is in a rotating state, the matching slider 2210 reciprocates in the limiting groove 140, and the limiting groove 140 is extended along the circumference of the kiln body 10. That is, the matching of the matching slider 2210 and the limiting groove 140 enables the second sealing plate 220 and the third sealing plate 230 to perform telescopic movement with the swing of the kiln body 10. In order to ensure the sealing of the sealing hole 110, it is necessary to make the second sealing plate 220 and the third sealing plate 230 match the sealing hole 110, and then when the second sealing plate 220 and the third sealing plate 230 slide, it can also ensure that the gas in the kiln will not be connected to the outside. In other embodiments, the second sealing plate 220 and the third sealing plate 230 are provided with limiting grooves 140 on opposite sides, and the kiln body 10 is provided with matching sliders 2210 matching with the limiting grooves 140 on opposite sides near the sealing hole 110; the matching sliders 2210 are extended along the circumference of the kiln body 10. This can also ensure that when the second sealing plate 220 and the third sealing plate 230 slide back and forth, the sealing hole 110 is not connected to the outside.

[0182] The kiln body 10 is also provided with a feed pipe 150, and a working chamber 160 is provided in the kiln body 10, and the feed pipe 150 is connected with the working chamber 160. The feed pipe 150 can be provided at one side of the kiln body 10, so as to facilitate the conveyance of raw materials into the kiln body 10.

[0183] The bottom of the kiln body 10 is provided with a first support block 170 and a second support block 180, which are used to support the kiln body 10 and can support the kiln body 10 to swing; wherein, the second support block 180 is arranged close to one side of the feed pipe 150, and the thickness between the top surface and the bottom surface of the second support block 180 is greater than the thickness between the top surface and the bottom surface of the first support block 170. The thickness of the second support block 180 is greater than the thickness of the first support block 170, and thus when the second support block 180 and the first support block 170 support the kiln body 10, the kiln body 10 can be tilted. That is, the feeding of the feed pipe 150 on the side of the second support block 180 can facilitate the transportation of the raw materials to the lower side, and thus can facilitate the collection on the side of the first support block 170.

[0184] The kiln body 10 is further provided with a mounting rib 190 in the working chamber 160. The extension direction of the mounting rib 190 is the same as the extension direction of the working chamber 160, and the two mounting ribs 190 are set at an angle. It should be noted that in one embodiment of the present invention, the left and right swing angle of the kiln body 10 is 120 degrees, and the left and right swings are 60 degrees respectively. The kiln body 10 has a stable state and two extreme swinging states on the left and right. The stable state corresponds to the non-swinging state, and the left and right extreme states correspond to the limits of the left and right swinging of the kiln body. In the stable state, the angles between the two ribs and the vertical direction of the kiln body 10 are 30 degrees respectively. It also corresponds to Figure 5 When the kiln body 10 swings to the extreme edges on both sides, such as the right limit state, for example, it can be referred to Figure 6 , Figure 6 for Figure 3 The structural diagram of another state of the mounting rib 190 shown. When the mounting rib 190, also known as the label W, moves to E, the mounting rib 190, also known as the label Q, moves to W, corresponding to the right limit state. At this time, the mounting rib 190, also known as the label E, located on the right side is in a horizontal state, and the mounting rib 190, also known as the label W, on the left side returns to the position of the mounting rib 190, also known as the label, in a stable state, and the left limit state is opposite thereto. At this time, the material will flip over from top to bottom, thereby flipping the material at the bottom to the top, thereby circulating to improve the uniformity of heating of the material. It should be noted that in one embodiment of the present invention, the cross-sectional shape of the mounting rib 190 is a trapezoidal setting, and in other embodiments, the cross-sectional shape of the mounting rib 190 may also be a triangular setting, a polygonal setting, or an arc setting, etc., which are not limited here.

[0185] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A swing kiln, characterized in that: include: The kiln body is provided with at least one sealing hole, one end of the burner is facing the sealing hole, and the kiln body is provided with matching holes on two opposite sides close to the sealing hole; The sealing assembly comprises a first sealing plate connected to the burner, the first sealing plate being slidably connected to the kiln body, and at least one second sealing plate and a third sealing plate being arranged on opposite sides of the first sealing plate and connected to the first sealing plate; wherein, One end of the second sealing plate and the third sealing plate are respectively matched with the matching holes, so that the kiln body is in a swinging state, the second sealing plate and the third sealing plate reciprocate and extend in the matching holes, and the sealing holes are not connected to the outside, and the first sealing plate swings relative to the kiln body in the opposite direction of the kiln body.

2. The swing kiln according to claim 1, characterized in that: The first sealing plate is provided with a mounting hole, and one end of the burner at least partially extends into the mounting hole, so that when the kiln body is in a swinging state, the first sealing plate and the kiln body swing in opposite directions.

3. The swing kiln according to claim 2, characterized in that: Sliding blocks are provided on opposite sides of the first sealing plate, and sliding grooves adapted to the sliding blocks are provided on opposite sides of the kiln body near the sealing hole; The chute is extended along the circumference of the kiln body.

4. The swing kiln according to claim 2, characterized in that: The first sealing plate is provided with slide grooves on two opposite sides thereof, and the kiln body is provided with sliding blocks matched with the slide grooves on two opposite sides thereof close to the slide grooves; The sliding block is extended along the circumference of the kiln body.

5. The swing kiln according to claim 1, characterized in that: The matching hole comprises a first matching hole and a second matching hole, one end of the second sealing plate is fixedly connected to the first sealing plate and at least partially stacked with the first sealing plate, and the other end is inserted into the first matching hole; One end of the third sealing plate is fixedly connected to the first sealing plate and at least partially stacked with the first sealing plate, and the other end of the third sealing plate is inserted into the second matching hole.

6. The swing kiln according to claim 1, characterized in that: The second sealing plate and the third sealing plate are provided with matching sliders on opposite sides, and the kiln body is provided with limiting grooves matching with the matching sliders on opposite sides near the sealing hole; wherein, The kiln body is in a rotating state, and the matching slider slides back and forth in the limiting groove; The limiting groove is extended along the circumference of the kiln body.

7. The swing kiln according to claim 1, characterized in that: The second sealing plate and the third sealing plate are provided with limiting grooves on opposite sides thereof, and matching sliding blocks adapted to the limiting grooves are provided on opposite sides of the kiln body near the sealing holes; The matching sliding block is extended along the circumference of the kiln body.

8. The swing kiln according to claim 1, characterized in that: The kiln body is also provided with a feed pipe, a working chamber is provided in the kiln body, and the feed pipe is communicated with the working chamber.

9. The swing kiln according to claim 8, characterized in that: The bottom of the kiln body is provided with a first support block and a second support block, the first support block and the second support block are used to support the kiln body and can support the kiln body to swing; wherein, The second support block is arranged close to one side of the feed pipe, and the thickness between the top surface and the bottom surface of the second support block is greater than the thickness between the top surface and the bottom surface of the first support block; The kiln body is further provided with two installation ribs in the working chamber, the extension direction of the installation ribs is the same as the extension direction of the working chamber, and the two installation ribs are arranged at an angle.

10. A method for producing calcium aluminate cement clinker and alumina cement clinker, characterized in that: The use of the swing kiln according to any one of claims 1 to 9 comprises: using the formed body obtained by wet pulping and extrusion as raw material, and sintering it in a one-stage swing kiln or a two-stage swing kiln; wherein, The length of the formed body along the diameter direction of the swing kiln cylinder ranges from 1 to 80 mm; The uniformity of the molded body is that the difference in moisture content per cubic centimeter is less than 0.5%; The temperature field of the swing kiln is as follows: the temperature of the feed preheating section is 100-450°C, the temperature of the middle soaking section is 500-800°C, and the temperature of the outlet sintering section is 1250-1700°C.

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