Formula and method for preparing foamed ceramic by dry-process powder preparation

Abstract

The invention discloses a formula and a method for preparing foamed ceramics by dry-process powder preparation, and relates to the technical field of foamed ceramics, and the formula comprises perlite, scraped slag of foamed ceramics, water mill tailings, squeezed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash and a foaming agent. According to the formula and the method for preparing the foamed ceramic by adopting dry-method powder preparation, in the processing process of the raw materials, the overall fluidity of the materials is controlled by controlling the particle size of the powdery granular materials, drying treatment after water adding granulation is not needed, and meanwhile, if the water content of the raw materials is smaller than or equal to 5% in the production and processing process, the raw materials are not required to be dried. The method does not need drying equipment to control the moisture content in the raw materials, so that the energy consumption of the whole equipment is lower, the whole equipment is more energy-saving and environment-friendly, and meanwhile, the method can solve the problems of thicker foam wall and non-uniform pore diameter caused by the fact that the foaming agent cannot be perfectly fused with coarse particles for foaming, so that the whole uniform foaming can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of foamed ceramics, and in particular to a formula and method for preparing foamed ceramics by dry powder making. Background Art

[0002] Foamed ceramics are a special ceramic material with a porous structure. It forms a lightweight, porous structure by introducing air or other gases into the ceramic raw materials to form a large number of tiny pores. The main characteristics of this material are low density, high porosity, good thermal insulation properties and high mechanical strength.

[0003] Dry powder making is to grind the raw materials according to the process formula to meet the requirements of the grinding process. After water spray granulation, powder with a moisture content of about 10% is obtained. After drying, powder with appropriate moisture content is obtained.

[0004] The above dry powder making has the following problems: more types of raw materials are needed, the mud content accounts for about 20% of the whole formula, and the mud needs to be dried before dry grinding can be used, and the whole raw material is greatly affected by moisture; the powder after water spray granulation has poor fluidity, and the uneven moisture after drying has a great influence on the pressing performance.

[0005] Therefore, it is necessary to propose a formula and method for preparing foamed ceramics by dry powder making to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a formula and method for preparing foamed ceramics by dry powder making, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A formula for preparing foamed ceramics by dry powder making comprises perlite, scraping residue of foamed ceramics, water-mill tailings, pressed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash and a foaming agent, wherein the formula comprises 27-45 parts of perlite, 30-45 parts of scraping residue of foamed ceramics, 0-25 parts of water-mill tailings, 2-16 parts of pressed mud of polished tiles, 1-3 parts of talc, 2-3.5 parts of heavy magnesium oxide, 0-3 parts of aluminum ash and 0.2 parts of a foaming agent in parts by mass.

[0009] Preferably, the perlite and the scraped slag of the foamed ceramic are both self-foaming raw materials, which are used to compensate for the uneven pore size caused by the inability of the foaming agent to enter the interior of the raw material. The raw talc is used to adjust the firing temperature of the foaming. The foaming agent includes but is not limited to silicon carbide, dolomite, barium sulfate, carbon powder, bicarbonate, aluminum powder, and bicarbonate. The mesh size range of the silicon carbide is 800-1500.

[0010] A method for preparing foamed ceramics by dry powder making, using the above-mentioned formula for preparing foamed ceramics by dry powder making, comprises the following steps:

[0011] S1: Coarse crushing: prepare raw materials, including perlite, scraping slag of foamed ceramics, water-mill tailings, pressed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash, silicon carbide, and use a forklift to transport raw materials with a particle size greater than 5 cm to the jaw crusher for preliminary crushing;

[0012] S2: Raw material homogenization: transport the raw materials after coarse crushing to the material field for homogenization. After testing, the temperature deviation is within 5°C and is qualified;

[0013] S3: Raw material drying: The homogenized qualified raw materials are dried in a rotary drying kiln to a moisture content of less than 5%;

[0014] S4: Fine crushing: The dried raw materials are transported to the compound Raymond crusher for fine crushing. After crushing, they are sieved through an 80-mesh high-frequency vibrating screen and then sent to a special small powder box for storage;

[0015] S5: Second fine crushing: the raw materials with a size larger than 80 mesh after crushing in step S4 are returned to the compound Raymond crusher through a belt for secondary fine crushing;

[0016] S6: Premixing ingredients of foaming agent: The foaming agent and finely crushed qualified raw materials are weighed manually according to the formula ratio, placed in the double cone mixer for full mixing, and then sent to a special small powder box for storage;

[0017] S7: Raw material mixing: The raw materials in the small powder box are batched according to the formula ratio by the belt electronic scale, fully mixed by the improved spiral mixer, and then sent to the powder bin in the raw material workshop;

[0018] S8: Aging treatment: The mixed raw materials are placed in a powder bin to age for more than 24 hours;

[0019] S9: re-stirring the raw materials: the raw materials after the aging treatment in step S8 are put into the multi-powder bin, stirred again by the miniaturized improved spiral mixer, and then transported to the belt feeding equipment;

[0020] S10: Belt feeding: evenly spread the powder material in the belt feeding equipment on the belt of the belt feeding equipment;

[0021] S11: Calcination and molding: The powder raw materials on the belt feeding equipment are evenly transferred into the refractory sagger, and calcined and molded at a high temperature of 1150-1250℃ in the foamed ceramic roller kiln to complete the preparation of the foamed ceramic.

[0022] Preferably, the fine crushing in steps S4 and S5 is mainly used to fully crush the homogenized raw materials and make them reach a specified gradation, including the following steps:

[0023] S501: Raw material crushing: The raw material is transported to the compound Raymond crusher for the first coarse crushing. The fineness of the raw material after crushing is close to 80 mesh and then it is fully crushed;

[0024] S502: Drying: Drying the crushed raw materials to control their moisture content below 5%;

[0025] S503: Screening: Screen out the raw materials with a mesh size less than 80, and return the unqualified coarse particles to the compound Raymond crusher for secondary crushing;

[0026] S504: Secondary crushing: The coarse particles in step S503 are subjected to secondary crushing to achieve the target gradation.

[0027] Preferably, the premixed ingredients of the foaming agent are used to finely manage the preparation process of the foamed ceramic to ensure the stability of the foaming effect and the performance of the product, including the following steps:

[0028] S601: Selection and proportion of foaming agent: Select appropriate foaming agent according to the production requirements of foamed ceramics. When large-scale foamed ceramics are required to be produced, silicon carbide, dolomite, barium sulfate, carbon powder, bicarbonate, aluminum powder, and bicarbonate are selected as foaming agents. When the pore structure of foamed ceramics needs to be adjusted, dolomite and barium sulfate are selected as foaming agents. When the foamed ceramics have high requirements for the pore structure, aluminum powder is selected as the foaming agent.

[0029] S602: Mixing of foaming agent: Place the selected foaming agent and the finely crushed qualified raw materials into a double cone mixer for full and uniform mixing;

[0030] S603: Testing of mixed materials: Test the mixed raw materials into the formula for trial burning to ensure that the amount of foaming agent added meets the requirements, including the concentration and distribution uniformity of the foaming agent;

[0031] S604: Adjustment and storage: Based on the test results, increase or decrease the amount of foaming agent added to the mixture that does not meet the requirements; increase the mixing time, and then store the adjusted mixture.

[0032] Preferably, the raw material mixing in step S6 is mainly used to mix the foaming agent and the raw materials generated in S4, and includes the following steps:

[0033] S605: Mixing equipment preparation: The improved spiral mixer is equipped with 5-10cm high spiral iron sheets around the inside to prevent the powder from accumulating in the roller;

[0034] S606: Raw material batching: Various raw materials that have been finely crushed in the small powder box, including the pre-mixed foaming agent, are accurately batched according to the formula through a belt electronic scale;

[0035] S607: stirring and mixing raw materials: the formulated raw materials are conveyed to the improved spiral mixer via a belt for thorough stirring;

[0036] S608: Screening of raw materials to remove iron: The evenly mixed granular powder is screened and iron removed through a drum circular screen.

[0037] Preferably, the belt fabric in S9 is used to transport the material while keeping it fully spread, and includes the following steps:

[0038] S101: Belt conveying speed control: Set the belt conveying speed to less than 0.5m / s to ensure that the material can be spread stably and evenly during the conveying process;

[0039] S102: Stability detection of belt distribution equipment: The stability of the belt distribution equipment is monitored in real time through a vibration sensor, and when the belt stability is abnormal, the belt is stopped in time and an abnormal alarm signal is transmitted;

[0040] S103: Belt cleaning and maintenance: Clean and maintain the belt feeding equipment to ensure its normal operation and prevent material contamination.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] In the present invention, during the processing of raw materials, the overall fluidity of the materials is controlled by controlling the particle size of the powder granular materials, and there is no need to perform drying treatment again after adding water for granulation. At the same time, if the moisture content of the raw materials is ≤5% during the production and processing, there is no need to use drying equipment to control the moisture content in the raw materials, thereby lowering the energy consumption of the overall equipment and making the overall equipment more energy-saving and environmentally friendly. By combining the raw materials of the method with the foaming agent for foaming, the problem of thick foam walls and uneven pore sizes caused by the inability of the foaming agent to perfectly blend with the coarse particles for foaming can be solved, so that overall uniform foaming can be achieved, and at the same time, the gas left in the gaps of the particles during the sintering process can be absorbed, so that sufficient oxygen can be provided for the foaming agent to foam at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a picture of the finished product of GF-12 and GF-13 of the present invention after being prepared in No. 3 electric furnace;

[0044] Figure 2 This is a picture of the finished product of GF-14 and GF-15 of the present invention;

[0045] Figure 3 This is a finished product picture of GF-12 and GF-13 of the present invention after being prepared in No. 2 electric furnace;

[0046] Figure 4 This is a picture of the finished product of GF-16 and GF-17 of the present invention;

[0047] Figure 5 This is a picture of the finished product of GF-17 and GF-12 of the present invention;

[0048] Figure 6 This is a picture of the finished product of GF-18 and GF-19 of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0050] Embodiment 1:

[0051] A formula for preparing foamed ceramics by dry powder making, comprising perlite, scraping slag of foamed ceramics, water-mill tailings, pressed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash, and a foaming agent, wherein the formula comprises 27-45 parts of perlite, 30-45 parts of scraping slag of foamed ceramics, 0-25 parts of water-mill tailings, 2-16 parts of pressed mud of polished tiles, 1-3 parts of talc, 2-3.5 parts of heavy magnesium oxide, 0-3 parts of aluminum ash, and 0.2 parts of a foaming agent in parts by mass;

[0052] Perlite and scraped slag of foamed ceramics are both self-foaming raw materials, which are used to make up for the uneven pore size caused by the inability of the foaming agent to enter the interior of the raw material. Raw talc is used to adjust the firing temperature of foaming. The foaming agent includes but is not limited to silicon carbide, dolomite, barium sulfate, carbon powder, bicarbonate, aluminum powder, and bicarbonate. The mesh size range of silicon carbide is 800-1500.

[0053] A method for preparing foamed ceramics by dry powder making, using the above-mentioned formula for preparing foamed ceramics by dry powder making, comprises the following steps:

[0054] S1: Coarse crushing: prepare raw materials, including perlite, scraping slag of foamed ceramics, water-mill tailings, pressed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash, silicon carbide, and use a forklift to transport raw materials with a particle size greater than 5 cm to the jaw crusher for preliminary crushing;

[0055] S2: Raw material homogenization: transport the raw materials after coarse crushing to the material field for homogenization. After testing, the temperature deviation is within 5°C and is qualified;

[0056] S3: Raw material drying: The homogenized qualified raw materials are dried in a rotary drying kiln to a moisture content of less than 5%;

[0057] S4: Fine crushing: The dried raw materials are transported to the compound Raymond crusher for fine crushing. After crushing, they are sieved through an 80-mesh high-frequency vibrating screen and then sent to a special small powder box for storage;

[0058] S5: Second fine crushing: the raw materials with a size larger than 80 mesh after crushing in step S4 are returned to the compound Raymond crusher through a belt for secondary fine crushing;

[0059] The fine crushing in steps S4 and S5 is mainly used to fully crush the homogenized raw materials and make them reach the specified gradation, including the following steps:

[0060] S501: Raw material crushing: The raw material is transported to the compound Raymond crusher for the first coarse crushing. The fineness of the raw material after crushing is close to 80 mesh and then it is fully crushed;

[0061] S502: Drying: Drying the crushed raw materials to control their moisture content below 5%;

[0062] S503: Screening: Screen out the raw materials with a mesh size less than 80, and return the unqualified coarse particles to the compound Raymond crusher for secondary crushing;

[0063] S504: Secondary crushing: Secondary crushing of the coarse particles in step S503 to achieve the target gradation;

[0064] S6: Premixing ingredients of foaming agent: The foaming agent and finely crushed qualified raw materials are weighed manually according to the formula ratio, placed in the double cone mixer for full mixing, and then sent to a special small powder box for storage;

[0065] The raw material mixing is mainly used to mix the foaming agent and the raw materials generated in S4, and includes the following steps:

[0066] S605: Mixing equipment preparation: The improved spiral mixer is equipped with 5-10cm high spiral iron sheets around the inside to prevent the powder from accumulating in the roller;

[0067] S606: Raw material batching: Various raw materials that have been finely crushed in the small powder box, including the pre-mixed foaming agent, are accurately batched according to the formula through a belt electronic scale;

[0068] S607: stirring and mixing raw materials: the formulated raw materials are conveyed to the improved spiral mixer via a belt for thorough stirring;

[0069] S608: Screening of raw materials for iron removal: Screening and iron removal of the evenly mixed granular powder through a drum round screen;

[0070] The premixed ingredients of the foaming agent are used to finely manage the preparation process of the foamed ceramic to ensure the stability of the foaming effect and the performance of the product, including the following steps:

[0071] S601: Selection and proportion of foaming agent: Select appropriate foaming agent according to the production requirements of foamed ceramics. When large-scale foamed ceramics are required to be produced, silicon carbide, dolomite, barium sulfate, carbon powder, bicarbonate, aluminum powder, and bicarbonate are used as foaming agents. When the pore structure of foamed ceramics needs to be adjusted, dolomite and barium sulfate are used as foaming agents. When the foamed ceramics have high requirements for the pore structure, aluminum powder is used as the foaming agent.

[0072] S602: Mixing of foaming agent: Place the selected foaming agent and finely crushed qualified raw materials into a double cone mixer for thorough and uniform mixing.

[0073] S603: Testing of the mixture: Test the mixed raw materials according to the formula to ensure that the amount of foaming agent added meets the requirements, including the concentration and uniformity of the distribution of the foaming agent.

[0074] S604: Adjustment and storage: According to the test results, increase or decrease the amount of foaming agent added to the mixture that does not meet the requirements; increase the mixing time, and then store the adjusted mixture;

[0075] S7: Raw material mixing: The raw materials in the small powder box are batched according to the formula ratio by the belt electronic scale, fully mixed by the improved spiral mixer, and then sent to the powder bin in the raw material workshop;

[0076] S8: Aging treatment: The mixed raw materials are placed in a powder bin to age for more than 24 hours;

[0077] S9: re-stirring the raw materials: the raw materials after the aging treatment in step S8 are put into the multi-powder bin, stirred again by the miniaturized improved spiral mixer, and then transported to the belt feeding equipment;

[0078] S10: Belt feeding: evenly spread the powder material in the belt feeding equipment on the belt of the belt feeding equipment;

[0079] Belt spreading is used to transport materials while keeping them fully spread, and includes the following steps:

[0080] S101: Belt conveying speed control: Set the belt conveying speed to less than 0.5m / s to ensure that the material can be spread stably and evenly during the conveying process;

[0081] S102: Stability detection of belt distribution equipment: The stability of the belt distribution equipment is monitored in real time through a vibration sensor, and when the belt stability is abnormal, the belt is stopped in time and an abnormal alarm signal is transmitted;

[0082] S103: Belt cleaning and maintenance: Clean and maintain the belt feeding equipment to ensure its normal operation and prevent material contamination;

[0083] S11: Calcination and molding: The powder raw materials on the belt feeding equipment are evenly transferred into the refractory sagger, and calcined and molded at a high temperature of 1150-1250℃ in the foamed ceramic roller kiln to complete the preparation of the foamed ceramic.

[0084] Embodiment 2:

[0085] The raw material composition of scraping slag and perlite of foamed ceramics is as follows:

[0086]

[0087]

[0088] Embodiment three:

[0089] The scraping slag of foamed ceramics was tested, and the following is the experimental table:

[0090]

[0091]

[0092] Embodiment 4:

[0093] Based on Example 3, the foamed ceramic formula is further tested, where silicon carbide is selected as the foaming agent. The following is the formula Table 1:

[0094]

[0095] According to the preparation method of Example 1, a preparation experiment was carried out, wherein silicon carbide was selected as the foaming agent, GF-12 and GF-13 were manually screened through a 60-mesh sieve (silicon carbide screened through an 80-mesh sieve), burned into a 3# electric furnace, and fired at a temperature curve of 0-352°C (30min)-1062°C (60min)-1192°C (120min) for 30min, GF-14 and GF-15 were prepared, ball-milled for 25min at a material ball ratio of 400:600, and burned into a 2# electric furnace, and fired at a temperature curve of 0-350°C (30min)-1050°C (60min)-1180°C (120min) for 30min;

[0096] The finished products of GF-12 and GF-13 are as follows Figure 1 As shown in the figure, it can be seen that the pore sizes of GF-12 and GF-13 are uneven, and the bottom of the sample is not completely reacted. According to the formula of GF-12 and GF-13, they are re-fired in the 2# electric furnace. Figure 3 As shown, it was found that the uneven pore size was caused by the electric furnace, and the pore size of GF-12 formula was more uniform;

[0097] The finished products of GF-14 and GF-15 are as follows Figure 2 As shown, it can be seen that the pore sizes of GF-14 and GF-15 are uniform, and the pore size of GF-14 is slightly larger than that of GF-15. However, the content of perlite and scraping slag in the formula is too high, so the formula needs to be changed.

[0098] According to the preparation method of Example 1, a preparation experiment was conducted. Silicon carbide was selected as the foaming agent. The contents of perlite and scraping slag in the formula were reduced to obtain formulas 16 and 17. The raw materials were burned into a 2# electric furnace and kept warm for 30 minutes at a temperature curve of 0-350°C (30min)-1050°C (60min)-1180°C (120min). The following is the formula table 2:

[0099]

[0100] like Figure 4 It can be seen that the pore sizes of GF-16 and GF-17 are relatively uniform, without obvious large pores, and the pores of GF-17 are smaller.

[0101] According to the preparation method of Example 1, a preparation experiment was carried out, wherein silicon carbide was selected as the foaming agent, and the formulations of GF-12 and GF-17 were selected, and the foam was pile-fired in a roller kiln in a workshop, and the mixture was fired at a temperature curve of 0-350°C (30min)-1050°C (60min)-1180°C (120min) for 30min. Figure 5 As shown, the pore size of GF-12 and GF-17 is relatively uniform but too large, and the firing temperature is too low. Some high-temperature materials need to be added to increase the temperature of the formula and reduce its pore size. The formula is adjusted on the basis of GF-12 and GF-17 to obtain GF-18 and GF-19, and then continue to be fired in the roller kiln in the workshop, and the temperature curve of 0-350℃ (30min)-1055℃ (60min)-1185℃ (120min) is kept warm for 30min. The following is the formula table 3:

[0102]

[0103] like Figure 6 It can be seen that the pore size is significantly reduced after adding a certain amount of water-mill tailings, and the most preferred formulas are recorded as GF-18 and GF-19.

[0104] It can be clearly concluded from the above conclusions that the scraped slag can be well mixed with the foaming agent, and foamed ceramics with uniform and fine pore sizes can be well produced by controlling the screen residue of the scraped slag and the amount of the foaming agent.

[0105] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A formula for preparing foamed ceramics by dry powder making, characterized in that: Including perlite, scraping slag of foamed ceramics, water-mill tailings, pressed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash, and foaming agent, including 27-45 parts of perlite, 30-45 parts of scraping slag of foamed ceramics, 0-25 parts of water-mill tailings, 2-16 parts of pressed mud of polished tiles, 1-3 parts of talc, 2-3.5 parts of heavy magnesium oxide, 0-3 parts of aluminum ash, and 0.2 parts of foaming agent by mass; The perlite and scraped slag of foamed ceramics are both self-foaming raw materials, which are used to make up for the uneven pore size caused by the inability of the foaming agent to enter the interior of the raw materials. The raw talc is used to adjust the firing temperature of foaming. The foaming agent includes but is not limited to silicon carbide, dolomite, barium sulfate, carbon powder, bicarbonate, aluminum powder, and bicarbonate. The mesh size range of the silicon carbide is 800-1500.

2. A method for preparing foamed ceramics by dry powder making, using the formula for preparing foamed ceramics by dry powder making as claimed in claim 1, characterized in that: The steps include: S1: Coarse crushing: prepare raw materials, including perlite, scraping slag of foamed ceramics, water-mill tailings, pressed mud of polished tiles, talc, heavy magnesium oxide, aluminum ash, silicon carbide, and use a forklift to transport raw materials with a particle size greater than 5 cm to the jaw crusher for preliminary crushing; S2: Raw material homogenization: transport the raw materials after coarse crushing to the material field for homogenization. After testing, the temperature deviation is within 5°C and is qualified; S3: Raw material drying: The homogenized qualified raw materials are dried in a rotary drying kiln to a moisture content of less than 5%; S4: Fine crushing: The dried raw materials are transported to the compound Raymond crusher for fine crushing. After crushing, they are sieved through an 80-mesh high-frequency vibrating screen and then sent to a special small powder box for storage; S5: Second fine crushing: the raw materials with a size larger than 80 mesh after crushing in step S4 are returned to the compound Raymond crusher through a belt for secondary fine crushing; S6: Premixing ingredients of foaming agent: The foaming agent and finely crushed qualified raw materials are weighed manually according to the formula ratio, placed in the double cone mixer for full mixing, and then sent to a special small powder box for storage; S7: Raw material mixing: The raw materials in the small powder box are batched according to the formula ratio by the belt electronic scale, fully mixed by the improved spiral mixer, and then sent to the powder bin in the raw material workshop; S8: Aging treatment: The mixed raw materials are placed in a powder bin to age for more than 24 hours; S9: re-stirring the raw materials: the raw materials after the aging treatment in step S8 are put into the multi-powder bin, stirred again by the miniaturized improved spiral mixer, and then transported to the belt feeding equipment; S10: Belt feeding: evenly spread the powder material in the belt feeding equipment on the belt of the belt feeding equipment; S11: Calcination and molding: The powder raw materials on the belt feeding equipment are evenly transferred into the refractory sagger, and calcined and molded at a high temperature of 1150-1250℃ in the foamed ceramic roller kiln to complete the preparation of the foamed ceramic; The fine crushing in steps S4 and S5 is mainly used to fully crush the homogenized raw materials and make them reach the specified gradation, including the following steps: S501: Raw material crushing: The raw material is transported to the compound Raymond crusher for the first coarse crushing. The fineness of the raw material after crushing is close to 80 mesh and then it is fully crushed; S502: Drying: Drying the crushed raw materials to control their moisture content below 5%; S503: Screening: Screen out the raw materials with a mesh size less than 80, and return the unqualified coarse particles to the compound Raymond crusher for secondary crushing; S504: Secondary crushing: Secondary crushing of the coarse particles in step S503 to achieve the target gradation; The premixed ingredients of the foaming agent are used to finely manage the preparation process of the foamed ceramic to ensure the stability of the foaming effect and the performance of the product, including the following steps: S601: Selection and proportion of foaming agent: Select appropriate foaming agent according to the production requirements of foamed ceramics. When large-scale foamed ceramics are required to be produced, silicon carbide, dolomite, barium sulfate, carbon powder, bicarbonate, aluminum powder, and bicarbonate are selected as foaming agents. When the pore structure of foamed ceramics needs to be adjusted, dolomite and barium sulfate are selected as foaming agents. When the foamed ceramics have high requirements for the pore structure, aluminum powder is selected as the foaming agent. S602: Mixing of foaming agent: Place the selected foaming agent and the finely crushed qualified raw materials into a double cone mixer for full and uniform mixing; S603: Testing of mixed materials: Test the mixed raw materials into the formula for trial burning to ensure that the amount of foaming agent added meets the requirements, including the concentration and distribution uniformity of the foaming agent; S604: Adjustment and storage: According to the test results, increase or decrease the amount of foaming agent added to the mixture that does not meet the requirements; increase the mixing time, and then store the adjusted mixture; The raw material mixing in step S6 is mainly used to mix the foaming agent and the raw materials generated in S4, and includes the following steps: S605: Mixing equipment preparation: The improved spiral mixer is equipped with 5-10cm high spiral iron sheets around the inside to prevent the powder from accumulating in the roller; S606: Raw material batching: Various raw materials that have been finely crushed in the small powder box, including the pre-mixed foaming agent, are accurately batched according to the formula through a belt electronic scale; S607: stirring and mixing raw materials: the formulated raw materials are conveyed to the improved spiral mixer via a belt for thorough stirring; S608: Screening of raw materials for iron removal: Screening and iron removal of the evenly mixed granular powder through a drum round screen; The belt fabric in S9 is used to transport the material while keeping it fully spread, and includes the following steps: S101: Belt conveying speed control: Set the belt conveying speed to less than 0.5m / s to ensure that the material can be spread stably and evenly during the conveying process; S102: Stability detection of belt distribution equipment: The stability of the belt distribution equipment is monitored in real time through a vibration sensor, and when the belt stability is abnormal, the belt is stopped in time and an abnormal alarm signal is transmitted; S103: Belt cleaning and maintenance: Clean and maintain the belt feeding equipment to ensure its normal operation and prevent material contamination.

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