A multiphase brick for cement kilns with enhanced refractory properties and its preparation method

Abstract

This invention discloses a multiphase brick for cement kilns with enhanced refractory properties and its preparation method, belonging to the technical field of multiphase brick preparation. The multiphase brick for cement kilns includes a lightweight refractory layer, a wear-resistant layer, a connecting layer, and a heat-insulating base layer. The lightweight refractory layer and the heat-insulating base layer are respectively fixedly connected to the upper and lower sides of the connecting layer, and the wear-resistant layer is wrapped around the outside of the lightweight refractory layer. The preparation method of the multiphase brick for cement kilns includes: S1, raw material pretreatment; S2, preparation of surface wear-resistant agent; S3, compaction; S4, firing of multiphase brick blanks. The multiphase brick prepared by this invention has good thermal shock resistance and creep resistance at high temperatures, high surface hardness, and can resist wear and erosion at high temperatures, thereby extending its service life. The multiphase brick of this invention has a lower density and lighter weight, making it easier to handle and install.

Description

Technical Field

[0001] This invention relates to the field of multiphase brick preparation technology, specifically to a multiphase brick for cement kilns with enhanced refractory properties and its preparation method. Background Technology

[0002] Refractory materials are generally divided into two types: unshaped refractories and shaped refractories. Unshaped refractories, also called castables, are mixed powdery granules composed of various aggregates and one or more binders. They must be mixed with one or more liquids before use and have strong fluidity. Shaped refractories generally refer to refractory bricks, which have standard and regular shapes, but can also be custom-made on-site as needed.

[0003] Refractory bricks, also known as fire bricks, are refractory materials made from refractory clay or other refractory raw materials. They are pale yellow or brownish in color. Primarily used for lining smelting furnaces, they can withstand high temperatures of 1,580℃–1,770℃. They are also called fire bricks. They are refractory materials with specific shapes and dimensions.

[0004] Because refractory bricks are processed as a whole, they are generally heavy and have poor performance in cement kilns. They are prone to cracking, damage, and are difficult to handle and install. Therefore, multiphase bricks, which have better performance than refractory bricks, have emerged. Multiphase bricks are usually composed of two or more materials, one of which is usually a high-alumina material with a high coefficient of thermal expansion and low thermal conductivity, which can effectively resist thermal shock damage.

[0005] Although existing multiphase bricks have better performance than refractory bricks, they still have problems such as easy cracking at the joints of different materials, poor surface wear resistance, and poor fire resistance and heat insulation performance. Therefore, there is a need for a multiphase brick for cement kilns with enhanced fire resistance. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a multiphase brick for cement kilns with enhanced refractory properties and a method for preparing the same.

[0007] The technical solution of the present invention is: a multiphase brick for cement kilns with enhanced refractory performance, comprising a lightweight refractory layer, a wear-resistant layer, a connecting layer, and a heat-insulating base layer, wherein the lightweight refractory layer and the heat-insulating base layer are respectively fixedly connected to the upper and lower sides of the connecting layer, and the wear-resistant layer is wrapped around the outside of the lightweight refractory layer;

[0008] By weight:

[0009] The heat insulation base material is composed of the following components in parts by weight: 1-3 parts silicon carbide powder, 5-8 parts high-iron magnesia sand, 4-9 parts silicon nitride powder, and 2-6 parts diatomaceous earth.

[0010] The binder is composed of the following components in parts by weight: 4-10 parts lightweight ceramsite, 1-3 parts carbon fiber, 2-5 parts silicon nitride fiber, 8-10 parts graphite fiber, and 10-15 parts clay powder.

[0011] The lightweight refractory material is composed of the following components in parts by weight: 4-8 parts cenospheres, 7-9 parts ceramic microspheres, 1-3 parts sub-white corundum hollow spheres, 5-10 parts aluminum silicate powder, 10-17 parts kaolin micro powder, and 3-7 parts chromium oxide micro powder.

[0012] The surface wear-resistant agent is composed of the following components in parts by weight: 0.5-2 parts ceramic powder, 0.5-1 parts graphene powder, 0.8-1.2 parts carbon powder, and 2-5 parts high-temperature resistant interface agent.

[0013] Furthermore, the high-temperature resistant interface agent is made by mixing low-sodium silicate sol and aluminum silicate cement in a mass ratio of 8:1.

[0014] Note: High-temperature resistant interface agent can effectively make the surface wear-resistant agent evenly adhere to the surface of the lightweight refractory layer, improve the surface strength of the lightweight refractory layer, and reduce the friction between the multiphase brick and cement.

[0015] Furthermore, a method for preparing a multiphase brick for cement kilns with enhanced refractory properties includes the following steps:

[0016] S1. Raw material pretreatment:

[0017] Silicon carbide powder, ferromagnesia, silicon nitride powder, and diatomaceous earth are mixed in a mixer according to the above proportions to obtain a heat-insulating base material. Lightweight ceramsite, carbon fiber, silicon nitride fiber, graphite fiber, and clay micro powder are mixed in a mixer according to the above proportions to obtain a binder material. Celery beads, ceramic microspheres, sub-white corundum hollow spheres, aluminum silicate powder, kaolin micro powder, and chromium oxide micro powder are mixed in a mixer according to the above proportions to obtain a lightweight refractory material. The heat-insulating base material, binder material, and lightweight refractory material are respectively placed in a drying oven for drying. After drying, pretreated heat-insulating base material, pretreated binder material, and pretreated lightweight refractory material are respectively obtained.

[0018] S2. Blend the surface wear-resistant agent:

[0019] Porcelain stone powder, graphene powder, carbon powder, and high-temperature resistant interface agent are mixed in a mixer according to the above ratio. After mixing, a surface wear-resistant agent is obtained.

[0020] S3, Compaction:

[0021] The mold grid is snapped into the mold groove, and then the pretreated heat insulation base material and pretreated lightweight refractory material obtained in step S1 are poured into the mold groove. The pretreated connecting material obtained in step S1 is introduced into the mold grid. The mold grid is removed and pressed by a press. After pressing, a multiphase brick blank is obtained.

[0022] S4. Firing of multiphase brick blanks:

[0023] The multiphase brick blank is placed in an electric kiln for firing. After firing, it is cooled with the furnace to obtain multiphase brick. The surface wear-resistant agent obtained in step S2 is poured into the wear-resistant agent tank. The lightweight refractory layer on the multiphase brick is immersed in the wear-resistant agent tank. Then, the multiphase brick is placed in a firing device for wear-resistant layer firing. After firing, multiphase brick for cement kiln is obtained.

[0024] Furthermore, in step S1, when mixing the insulating base material, the mixing speed of the mixer is 300-400 r / min and the mixing time is 30-40 min; when mixing the connecting material, the mixing speed of the mixer is 120-150 r / min and the mixing time is 1-2 h; and when mixing the lightweight refractory material, the mixing speed of the mixer is 180-250 r / min.

[0025] Note: The above mixing speed can effectively improve the mixing efficiency of the insulating base material, binder, and lightweight refractory.

[0026] Furthermore, in step S1, the drying temperature of the heat-insulating base material is 150-200℃ and the drying time is 10-20 min; the drying temperature of the connecting material is 100-120℃ and the drying time is 15-30 min; and the drying temperature of the lightweight refractory material is 250-300℃ and the drying time is 10-15 min.

[0027] Note: Drying in a drying oven can remove moisture from the raw materials, reduce the porosity of the multiphase bricks, and improve their strength.

[0028] Furthermore, in step S3, the pressing pressure of the press is 2.2-2.5 MPa, and the pressing frequency is 2-5 times.

[0029] Note: Under the above-mentioned pressing pressure, the pressing effect is good, the quality of the multiphase bricks is consistent, the shape is regular, and the pressing efficiency is high.

[0030] Furthermore, in step S4, the firing temperature of the electric kiln is 1300-1600℃ and the firing time is 24-26h, while the firing temperature of the firing device is 1200-1500℃ and the firing time is 1-2h.

[0031] Explanation: The multiphase bricks are fired in an electric kiln. After firing, the wear-resistant layer of the multiphase bricks is fired separately using a firing device. The multiphase bricks obtained by the above method have a smooth surface, low friction with cement, and good performance.

[0032] Furthermore, in step S2, the stirring speed is 100-150 r / min, the stirring time is 10-20 min, and the stirring temperature is 50-80℃.

[0033] Note: The above stirring parameters are beneficial to the mixing of the components in the surface wear-resistant agent and can improve the mixing efficiency of the components in the surface wear-resistant agent.

[0034] Furthermore, in step S3, the mold includes a mold groove and a mold block. A positioning groove is provided on each of the left and right sides of the middle part of the mold groove. A positioning plate is fixedly connected to each side of the mold block, and the positioning plate is engaged with the positioning groove.

[0035] Note: The heat insulation base material, connecting material, and lightweight refractory material are filled into different areas through the mold groove to facilitate subsequent pressing.

[0036] Furthermore, in step S4, the firing device includes a fixed frame, with multiple firing devices arranged above the fixed frame. Each firing device includes an electric cylinder, the top of which is fixedly connected to the fixed frame. A firing shell is provided at the bottom of the electric cylinder, and a heat insulation layer is fixedly connected to the inner wall of the firing shell. A heat insulation groove is provided inside the heat insulation layer, and multiple heating wires are provided inside the heat insulation groove. A placement plate is provided below the firing device, and the placement plate is fixedly connected to the fixed frame. The placement plate has multiple grooves for placing multiphase brick blanks. A PLC controller is fixedly connected to one side of the fixed frame, and the PLC controller is electrically connected to the electric cylinder and the heating wires.

[0037] Note: The firing device can effectively heat and fire the wear-resistant layer separately, thereby avoiding the overall firing time of the multiphase brick being too long, which would reduce the strength of the multiphase brick.

[0038] The beneficial effects of this invention are:

[0039] (1) The heat insulation effect of the heat insulation base layer in the multiphase brick of the present invention is good. The connecting layer contains a variety of fibers, which can effectively connect the heat insulation base layer and the lightweight refractory layer, making it less prone to cracking. The lightweight refractory layer has high fire resistance and low weight, which can effectively reduce the load on the heat insulation base layer.

[0040] (2) The multiphase brick prepared by the present invention has good thermal shock resistance and creep resistance at high temperature, and has high surface hardness, which can resist wear and erosion at high temperature, thereby extending its service life. The multiphase brick of the present invention has low density and lighter weight, making it easy to handle and install. Attached Figure Description

[0041] Figure 1 This is a top view of the mold structure of the multiphase brick of the present invention.

[0042] Figure 2 This is a partial left view of the connection between the positioning groove and the positioning plate of the present invention.

[0043] Figure 3 This is a structural diagram of the multiphase brick of the present invention.

[0044] Figure 4 This is a structural diagram of the firing apparatus of the present invention.

[0045] Figure 5 This is a cross-sectional view of the shell produced by the present invention.

[0046] Among them, 11-mold groove, 12-mold block, 13-positioning groove, 14-positioning plate, 21-fixed frame, 22-firing device, 221-electric cylinder, 222-firing shell, 223-heat insulation layer, 224-heat insulation groove, 225-heating wire, 23-placement plate, 231-groove, 24-PLC controller, 31-lightweight refractory layer, 32-wear-resistant layer, 33-connecting layer, 34-heat insulation base layer. Detailed Implementation

[0047] Example 1:

[0048] A multiphase brick for cement kilns with enhanced refractory performance includes a lightweight refractory layer 31, a wear-resistant layer 32, a connecting layer 33, and a heat-insulating base layer 34. The lightweight refractory layer 31 and the heat-insulating base layer 34 are respectively fixedly connected to the upper and lower sides of the connecting layer 33, and the wear-resistant layer 32 is wrapped around the outside of the lightweight refractory layer 31.

[0049] By weight:

[0050] The thermal insulation base material is composed of the following components in parts by weight: 1 part silicon carbide powder, 5 parts high-iron magnesia sand, 4 parts silicon nitride powder, and 2 parts diatomaceous earth;

[0051] The binder is composed of the following components by weight: 4 parts lightweight ceramsite, 1 part carbon fiber, 2 parts silicon nitride fiber, 8 parts graphite fiber, and 10 parts clay powder.

[0052] The lightweight refractory is composed of the following components by weight: 4 parts cenospheres, 7 parts ceramic microspheres, 1 part sub-white corundum hollow spheres, 5 parts aluminum silicate powder, 10 parts kaolin micro powder, and 3 parts chromium oxide micro powder.

[0053] The surface wear-resistant agent is composed of the following components in parts by weight: 0.5 parts ceramic powder, 0.5 parts graphene powder, 0.8 parts carbon powder, and 2 parts high-temperature resistant interface agent.

[0054] The high-temperature resistant interface agent is made by mixing low-sodium silicate sol and aluminum silicate cement in a mass ratio of 8:1.

[0055] Example 2:

[0056] A multiphase brick for cement kilns with enhanced refractory performance includes a lightweight refractory layer 31, a wear-resistant layer 32, a connecting layer 33, and a heat-insulating base layer 34. The lightweight refractory layer 31 and the heat-insulating base layer 34 are respectively fixedly connected to the upper and lower sides of the connecting layer 33, and the wear-resistant layer 32 is wrapped around the outside of the lightweight refractory layer 31.

[0057] By weight:

[0058] The thermal insulation base material is composed of the following components by weight: 2 parts silicon carbide powder, 6 parts ferromagnesia sand, 5 parts silicon nitride powder, and 4 parts diatomaceous earth.

[0059] The binder is composed of the following components by weight: 5 parts lightweight ceramsite, 2 parts carbon fiber, 3 parts silicon nitride fiber, 9 parts graphite fiber, and 13 parts clay powder.

[0060] The lightweight refractory is composed of the following components by weight: 5 parts cenospheres, 8 parts ceramic microspheres, 2 parts sub-white corundum hollow spheres, 9 parts aluminum silicate powder, 15 parts kaolin micro powder, and 5 parts cubic chromium oxide micro powder.

[0061] The surface wear-resistant agent is composed of the following components by weight: 1 part ceramic powder, 0.8 parts graphene powder, 1 part carbon powder, and 3 parts high-temperature resistant interface agent.

[0062] The high-temperature resistant interface agent is made by mixing low-sodium silicate sol and aluminum silicate cement in a mass ratio of 8:1.

[0063] Example 3:

[0064] A multiphase brick for cement kilns with enhanced refractory performance includes a lightweight refractory layer 31, a wear-resistant layer 32, a connecting layer 33, and a heat-insulating base layer 34. The lightweight refractory layer 31 and the heat-insulating base layer 34 are respectively fixedly connected to the upper and lower sides of the connecting layer 33, and the wear-resistant layer 32 is wrapped around the outside of the lightweight refractory layer 31.

[0065] By weight:

[0066] The thermal insulation base material is composed of the following components by weight: 3 parts silicon carbide powder, 8 parts ferromagnesia sand, 9 parts silicon nitride powder, and 6 parts diatomaceous earth;

[0067] The binder is composed of the following components by weight: 10 parts lightweight ceramsite, 3 parts carbon fiber, 5 parts silicon nitride fiber, 10 parts graphite fiber, and 15 parts clay powder.

[0068] The lightweight refractory is composed of the following components by weight: 8 parts cenospheres, 9 parts ceramic microspheres, 3 parts sub-white corundum hollow spheres, 10 parts aluminum silicate powder, 17 parts kaolin micro powder, and 7 parts cubic chromium oxide micro powder.

[0069] The surface wear-resistant agent is composed of the following components by weight: 2 parts ceramic powder, 1 part graphene powder, 1.2 parts carbon powder, and 5 parts high-temperature resistant interface agent.

[0070] The high-temperature resistant interface agent is made by mixing low-sodium silicate sol and aluminum silicate cement in a mass ratio of 8:1.

[0071] Comparing Examples 1-3, the multiphase brick of Example 3 has the best performance, therefore Example 3 is the best example.

[0072] Example 4:

[0073] Based on Example 3, Example 4 provides a method for preparing multiphase bricks for cement kilns with enhanced refractory properties, comprising the following steps:

[0074] S1. Raw material pretreatment:

[0075] Silicon carbide powder, ferromagnesia, silicon nitride powder, and diatomaceous earth are mixed in a mixer according to the above proportions to obtain a heat-insulating base material. Lightweight ceramsite, carbon fiber, silicon nitride fiber, graphite fiber, and clay micro powder are mixed in a mixer according to the above proportions to obtain a binder material. Celery beads, ceramic microspheres, sub-white corundum hollow spheres, aluminum silicate powder, kaolin micro powder, and chromium oxide micro powder are mixed in a mixer according to the above proportions to obtain a lightweight refractory material. The heat-insulating base material, binder material, and lightweight refractory material are placed in a drying oven for drying. After drying, pretreated heat-insulating base material, pretreated binder material, and pretreated lightweight refractory material are obtained respectively.

[0076] S2. Blend the surface wear-resistant agent:

[0077] Porcelain stone powder, graphene powder, carbon powder, and high-temperature resistant interface agent are mixed in a mixer according to the above ratio. After mixing, a surface wear-resistant agent is obtained.

[0078] S3, Compaction:

[0079] The mold block 12 is snapped into the mold groove 11. Then the pretreated heat insulation base material and pretreated lightweight refractory material obtained in step S1 are poured into the mold groove 11. The pretreated connecting material obtained in step S1 is introduced into the mold block 12. The mold block 12 is removed and pressed by a press. After pressing, a multiphase brick blank is obtained.

[0080] S4. Firing of multiphase brick blanks:

[0081] The multiphase brick blank is placed in an electric kiln for firing. After firing, it is cooled with the furnace to obtain multiphase brick. The surface wear-resistant agent obtained in step S2 is poured into the wear-resistant agent tank. The wear-resistant agent tank adopts an ordinary square tank. The lightweight refractory layer on the multiphase brick is immersed in the wear-resistant agent tank. Then, the multiphase brick is placed in a firing device for the wear-resistant layer 32 firing. After firing, multiphase brick for cement kiln is obtained.

[0082] In step S1, when mixing the insulating base material, the mixing speed of the mixer is 300 r / min and the mixing time is 30 min. When mixing the connecting material, the mixing speed of the mixer is 120 r / min and the mixing time is 1 h. When mixing the lightweight refractory material, the mixing speed of the mixer is 180 r / min.

[0083] In step S1, the drying temperature of the insulating base material is 150℃ and the drying time is 10min, the drying temperature of the connecting material is 100℃ and the drying time is 15min, and the drying temperature of the lightweight refractory material is 250℃ and the drying time is 10min.

[0084] In step S3, the pressing pressure of the press is 2.2 MPa, and the pressing is performed twice.

[0085] In step S4, the firing temperature of the electric kiln is 1300℃ and the firing time is 24h, while the firing temperature of the firing device is 1200℃ and the firing time is 1h.

[0086] In step S2, the stirring speed is 100 r / min, the stirring time is 10 min, and the stirring temperature is 50℃.

[0087] Example 5:

[0088] Based on Example 4, the difference between this example and Example 4 is as follows:

[0089] In step S1, when mixing the insulating base material, the mixing speed of the mixer is 350 r / min and the mixing time is 35 min. When mixing the connecting material, the mixing speed of the mixer is 130 r / min and the mixing time is 1.5 h. When mixing the lightweight refractory material, the mixing speed of the mixer is 200 r / min.

[0090] In step S1, the drying temperature of the heat insulation base material is 180℃ and the drying time is 15min, the drying temperature of the binder material is 110℃ and the drying time is 25min, and the drying temperature of the lightweight refractory material is 280℃ and the drying time is 13min.

[0091] In step S3, the pressing pressure of the press is 2.4 MPa, and the pressing is performed 3 times.

[0092] In step S4, the firing temperature of the electric kiln is 1500℃ and the firing time is 25h, while the firing temperature of the firing device is 1300℃ and the firing time is 1.5h.

[0093] In step S2, the stirring speed is 130 r / min, the stirring time is 15 min, and the stirring temperature is 60℃.

[0094] Example 6:

[0095] Based on Example 4, the difference between this example and Example 4 is as follows:

[0096] In step S1, when mixing the insulating base material, the mixing speed of the mixer is 400 r / min and the mixing time is 40 min. When mixing the connecting material, the mixing speed of the mixer is 150 r / min and the mixing time is 2 h. When mixing the lightweight refractory material, the mixing speed of the mixer is 250 r / min.

[0097] In step S1, the drying temperature of the heat insulation base material is 200℃ and the drying time is 20min, the drying temperature of the bonding material is 120℃ and the drying time is 30min, and the drying temperature of the lightweight refractory material is 300℃ and the drying time is 15min.

[0098] In step S3, the pressing pressure of the press is 2.5 MPa, and the pressing is performed 5 times.

[0099] In step S4, the firing temperature of the electric kiln is 1600℃ and the firing time is 26h, while the firing temperature of the firing device is 1500℃ and the firing time is 2h.

[0100] In step S2, the stirring speed is 150 r / min, the stirring time is 20 min, and the stirring temperature is 80℃.

[0101] Example 7:

[0102] Based on embodiment 6, this embodiment provides that the mold in step S3 includes a mold groove 11 and a mold block 12. A positioning groove 13 is provided on each of the left and right sides of the middle part of the mold groove 11. A positioning plate 14 is fixedly connected to each side of the mold block 12, and the positioning plate 14 is engaged with the positioning groove 13.

[0103] In this embodiment, the heat-insulating base material, connecting material, and lightweight refractory material are filled into different areas through the mold groove 11, which facilitates subsequent pressing.

[0104] Example 8:

[0105] Based on Embodiment 7, this embodiment provides a firing device in step S4 including a fixed frame 21, with multiple firing devices 22 above the fixed frame 21. Each firing device 22 includes an electric cylinder 221, the top of which is fixedly connected to the fixed frame 21. The bottom of the electric cylinder 221 is provided with a firing shell 222, and a heat insulation layer 223 is fixedly connected to the inner wall of the firing shell 222. The heat insulation layer 223 is provided with a heat insulation groove 224, and multiple heating wires 225 are provided in the heat insulation groove 224. A placement plate 23 is provided below the firing device 22, and the placement plate 23 is fixedly connected to the fixed frame 21. The placement plate 23 is provided with multiple grooves 231 for placing multiphase brick blanks. A PLC controller 24 is fixedly connected to one side of the fixed frame 21, and the PLC controller 24 is electrically connected to the electric cylinder 221 and the heating wires 225.

[0106] In this embodiment, the wear-resistant layer can be heated and fired separately using a firing device, thereby avoiding excessively long overall firing time for the multiphase bricks, which would reduce the strength of the multiphase bricks.

[0107] The heating wire 225, electric cylinder 221, and PLC controller 24 used in the above embodiments are all commercially available products. As long as they can achieve the functions of the present invention, they are acceptable. Those skilled in the art can choose to use them based on common sense, and no special limitations are made here.

Claims

1. A multiphase brick for cement kilns with enhanced refractory properties, characterized in that, It includes a lightweight refractory layer (31), a wear-resistant layer (32), a connecting layer (33), and a heat-insulating base layer (34). The lightweight refractory layer (31) and the heat-insulating base layer (34) are respectively fixedly connected to the upper and lower sides of the connecting layer (33), and the wear-resistant layer (32) is wrapped around the outside of the lightweight refractory layer (31). The heat insulation base layer (34) is made of heat insulation base material, which is composed of the following components by weight: 1-3 parts silicon carbide powder, 5-8 parts high-iron magnesium sand, 4-9 parts silicon nitride powder, and 2-6 parts diatomaceous earth. The connecting layer (33) is made of a connecting material, which is composed of the following components in parts by weight: 4-10 parts of lightweight ceramsite, 1-3 parts of carbon fiber, 2-5 parts of silicon nitride fiber, 8-10 parts of graphite fiber, and 10-15 parts of clay powder. The lightweight refractory layer (31) is made of lightweight refractory material, which is composed of the following components by weight: 4-8 parts of cenospheres, 7-9 parts of ceramic microspheres, 1-3 parts of sub-white corundum hollow spheres, 5-10 parts of aluminum silicate powder, 10-17 parts of kaolin micro powder, and 3-7 parts of chromium oxide micro powder. The wear-resistant layer (32) is made of a surface wear-resistant agent, which is composed of the following components in parts by weight: 0.5-2 parts ceramic stone powder, 0.5-1 parts graphene powder, 0.8-1.2 parts carbon powder, and 2-5 parts high-temperature resistant interface agent.

2. The multiphase brick for cement kilns with enhanced refractory properties as described in claim 1, characterized in that, The high-temperature resistant interface agent is made by mixing low-sodium silicate sol and aluminum silicate cement in a mass ratio of 8:

1.

3. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 1, characterized in that, Includes the following steps: S1. Raw material pretreatment: Silicon carbide powder, ferromagnesia, silicon nitride powder, and diatomaceous earth are mixed in a mixer according to the above proportions to obtain a heat-insulating base material. Lightweight ceramsite, carbon fiber, silicon nitride fiber, graphite fiber, and clay micro powder are mixed in a mixer according to the above proportions to obtain a binder material. Celery beads, ceramic microspheres, sub-white corundum hollow spheres, aluminum silicate powder, kaolin micro powder, and chromium oxide micro powder are mixed in a mixer according to the above proportions to obtain a lightweight refractory material. The heat-insulating base material, binder material, and lightweight refractory material are respectively placed in a drying oven for drying. After drying, pretreated heat-insulating base material, pretreated binder material, and pretreated lightweight refractory material are respectively obtained. S2. Blend the surface wear-resistant agent: Porcelain stone powder, graphene powder, carbon powder, and high-temperature resistant interface agent are mixed in a mixer according to the above ratio. After mixing, a surface wear-resistant agent is obtained. S3, Compaction: The mold block (12) is snapped into the mold groove (11), and then the pretreated heat insulation base material and pretreated lightweight refractory material obtained in step S1 are poured into the mold groove (11). The pretreated connecting material obtained in step S1 is introduced into the mold block (12). The mold block (12) is taken out and pressed by the press. After pressing, a multiphase brick blank is obtained. S4. Firing of multiphase brick blanks: The multiphase brick blank is placed in an electric kiln for firing. After firing, it is cooled with the furnace to obtain multiphase brick. The surface wear-resistant agent obtained in step S2 is poured into the wear-resistant agent tank. The lightweight refractory layer on the multiphase brick is immersed in the wear-resistant agent tank. Then the multiphase brick is placed in a firing device for the wear-resistant layer (32) firing. After firing, multiphase brick for cement kiln is obtained.

4. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, In step S1, when mixing the insulating base material, the mixing speed of the mixer is 300-400 r / min and the mixing time is 30-40 min. When mixing the connecting material, the mixing speed of the mixer is 120-150 r / min and the mixing time is 1-2 h. When mixing the lightweight refractory material, the mixing speed of the mixer is 180-250 r / min.

5. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, In step S1, the drying temperature of the heat-insulating base material is 150-200℃ and the drying time is 10-20 min; the drying temperature of the connecting material is 100-120℃ and the drying time is 15-30 min; and the drying temperature of the lightweight refractory material is 250-300℃ and the drying time is 10-15 min.

6. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, In step S3, the pressing pressure of the press is 2.2-2.5 MPa, and the pressing number is 2-5 times.

7. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, In step S4, the firing temperature of the electric kiln is 1300-1600℃ and the firing time is 24-26h, while the firing temperature of the firing device is 1200-1500℃ and the firing time is 1-2h.

8. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, In step S2, the stirring speed is 100-150 r / min, the stirring time is 10-20 min, and the stirring temperature is 50-80℃.

9. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, The mold in step S3 includes a mold groove (11) and a mold block (12). A positioning groove (13) is provided on each of the left and right sides of the middle part of the mold groove (11). A positioning plate (14) is fixedly connected to each side of the mold block (12). The positioning plate (14) is engaged with the positioning groove (13).

10. The method for preparing a multiphase brick for cement kilns with enhanced refractory properties as described in claim 3, characterized in that, The mold in step S3 includes a mold groove (11) and a mold guard (12). A positioning groove (13) is provided on each of the left and right sides of the middle part of the mold groove (11), and a positioning plate (14) is fixedly connected to each side of the mold guard (12).

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