CN118084457A - Preparation method of low-density ceramsite - Google Patents

Preparation method of low-density ceramsite Download PDF

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Publication number
CN118084457A
CN118084457A CN202410517261.4A CN202410517261A CN118084457A CN 118084457 A CN118084457 A CN 118084457A CN 202410517261 A CN202410517261 A CN 202410517261A CN 118084457 A CN118084457 A CN 118084457A
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ceramsite
parts
low
density
raw materials
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郑鹏
郑丽
谢秋波
高运杰
陈培尧
陈品伟
吴晶晶
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Qin Han Ceramic Tongchuan LLC
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Qin Han Ceramic Tongchuan LLC
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Abstract

The invention discloses a preparation method of low-density ceramsite, which comprises the following components: 45-55 parts of bauxite, 25-30 parts of aluminum slag, 10-13 parts of waste ceramic tile powder, 3-5 parts of talcum powder, 2-3 parts of calcium carbonate and 1.5-3 parts of mullite, and the concrete steps are as follows: the waste ceramic tile is crushed by a coarse crusher and then ball-milled to 500-mesh ceramic tile powder, bauxite, aluminum slag, talcum powder, calcium carbonate and mullite are respectively ball-milled to 500-mesh particles, and then mixed, homogenized and granulated into a semi-finished product according to a proportion, and baked at 110-120 ℃ and baked at a high temperature of 1200-1250 ℃ for 7.5-8 hours to obtain the finished product. The ceramsite prepared by the method has the advantages of high strength, low density, corrosion resistance and good stability, and is energy-saving and environment-friendly, low in cost and easy to popularize due to the adoption of the recycled raw materials.

Description

Preparation method of low-density ceramsite
Technical Field
The invention relates to the technical field of ceramsite propping agents for oil and gas field fracturing construction exploitation, in particular to a preparation method of low-density ceramsite.
Background
Various byproducts are generated in the aluminum smelting and forming processes, aluminum slag is some impure mixed metal slag generated in the aluminum smelting process, aluminum slag is used as waste slag in the aluminum production process, aluminum resource waste is caused, and the problem of environmental pollution is also caused, meanwhile, a large amount of waste ceramic tiles are generated in the tile production and house decoration processes, the waste ceramic tiles are piled as solid wastes, the environmental problems are continuously emphasized in recent years, and the solid wastes are required to be reduced, environment-friendly and recycled, so that development of a new way for harmless treatment of the aluminum slag and the waste ceramic tiles is needed, waste materials are changed into valuable materials, and resources are reasonably utilized.
The aluminum slag is mainly composed of metallic aluminum and nonmetallic oxides, wherein the aluminum oxide generally accounts for more than 60%, the aluminum accounts for 10-20%, other oxides comprise silicon oxide (5-8%), magnesium oxide (1-2%), calcium oxide (1-2%), sodium oxide (0.5-0.7%), ferric oxide (0.3-0.6%), and the like, the main components of the waste ceramic tile are clay (60-70%), quartz sand (8-11%), feldspar (7-10%), calcium carbonate (3-4%), talcum (1.5-2%), titanium dioxide (0.5-1%), ferric oxide (0.3-0.7%), silicon carbide (0.1-0.2%), and the like, and the aluminum slag and the waste ceramic tile are used as raw materials or ingredients to prepare the propping agent, so that the ceramic tile is one of the most effective modes for realizing harmless and recycling.
The ceramic proppant is a key material for exploitation and fracturing construction of low-permeability oil and gas wells of petroleum and natural gas, and when the product is applied to fracturing construction of oil and gas wells, the ceramic proppant is filled into stratum cracks of low-permeability mineral deposits, and high-closure fracturing treatment is carried out, so that the stratum containing the oil and gas is cracked, and the cracks are supported and are not closed due to stress release, so that the high diversion capability of the oil and gas is maintained, the oil and gas yield can be increased, the service life of the oil and gas wells can be prolonged, deep oil and gas wells are developed, the yield is improved, and the fracturing process is widely adopted.
The fracturing propping agent used for oil and gas exploitation in the current market mainly comprises quartz sand propping agent, ceramsite propping agent, resin coating propping agent and the like. The quartz sand propping agent has the advantages of economy, low density, convenience in construction and the like, but the defects of low strength, high crushing rate, poor sphericity and the like reduce the flow conductivity, and the resin coated propping agent has the advantages of high sphericity, low crushing rate, strong corrosion resistance, good flow conductivity and the like, but the cost is high, the preparation process is complex, and the ceramsite propping agent adopting bauxite as a main raw material has the advantages of high strength, low crushing rate, high sphericity, corrosion resistance, lower cost and the like.
The publication No. CN 113956864B discloses a low-density high-strength ceramic proppant coated by silicon dioxide and a preparation method thereof, wherein the ceramic proppant is mixed with tetraethoxysilane to obtain a mixture A, an ammonia solution is prepared to obtain a solution B, the solution B is added into the mixture A, the reaction is continuously stirred and carried out, the reaction temperature is 60-80 ℃, the reaction time is 2 hours, then the mixture is dried and naturally cooled to obtain the low-density high-strength ceramic proppant, the low-density high-strength ceramic proppant has higher strength and lower density based on the silicon dioxide, the effects of improving the strength of the ceramic proppant and reducing the density are achieved, and the obtained product has the advantages of low cost, low density, high strength and the like, thereby being beneficial to reducing the damage of fracturing fluid to the permeability of a bottom layer and improving the oil gas exploitation quantity.
The publication No. CN 115724679B discloses a low-density high-strength environment-friendly ceramsite proppant and a preparation method thereof, water-based drilling rock chips and bauxite are adopted as raw materials, 30% of the water-based drilling rock chips and 70% of the bauxite are uniformly mixed by a ball mill at the rotating speed of 200 r/min to obtain powder, water is added by a spraying method for granulation, the powder is dried at 80 ℃ to obtain 0.8 cm spherical green bodies, and then the spherical green bodies are sintered and cooled to room temperature to obtain ceramsites.
In the existing ceramsite production process, the existing bauxite and silicon dioxide are mainly used as raw materials, and are produced by adding additives such as magnesium oxide or manganese oxide for proportioning or adding water-based drilling cuttings which are difficult to obtain, but the cost of the produced high-strength low-density ceramsite propping agent is higher due to limited resources and distribution of high-quality bauxite and water-based drilling cuttings and the need of adding the additives such as magnesium oxide, manganese oxide and ethyl orthosilicate. According to the invention, the bauxite, the talcum powder, the calcium carbonate and the mullite are added simultaneously by taking the waste aluminum slag and the ceramic tiles in the market as raw materials, and the ceramic grains with low density, high strength, high stability and low breakage rate are prepared by modulating according to scientific proportion, so that the production cost is reduced while the ceramic grains with high strength and low density are obtained.
Disclosure of Invention
The invention aims to provide a preparation method of low-density ceramsite, which aims to solve the problems of low product strength, high density, complex process, high cost and the like in the technical process of preparing ceramsite in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a preparation method of low-density ceramsite mainly uses bauxite, aluminum slag and waste ceramic tiles as main raw materials, talcum powder, calcium carbonate and mullite are added at the same time, and the high-strength low-density ceramsite is obtained through crushing, homogenizing, granulating, baking and high-temperature sintering, and the preparation method comprises the following steps:
(1) Putting the waste ceramic tiles into a coarse crusher for crushing, wherein the mesh number of a screen of the crusher is 50 meshes, the rotating speed is set to 800 turns/min, ball milling is carried out on the coarsely crushed ceramic tiles through a ball mill, the rotating speed of the ball mill is set to 90 turns/min, the mesh number after fine crushing is 500 meshes, and bauxite, aluminum slag, talcum powder, calcium carbonate and mullite raw materials are respectively crushed and ball milled to 500 meshes.
(2) 45-55 Parts of bauxite, 25-30 parts of aluminum slag, 10-13 parts of waste ceramic tile powder, 3-5 parts of talcum powder, 2-3 parts of calcium carbonate and 1.5-3 parts of mullite are mixed and homogenized according to a proportion, wherein the homogenization setting parameters are that the homogenization pressure is 3.5-4MP, the working medium temperature is 55-60 ℃, the rotation speed is 8500-9000 revolutions per minute, and the homogenization time is 10-15 minutes.
(3) Adding the mixed and homogenized raw materials into a granulator for granulating and shaping twice, and simultaneously adding atomized water vapor, wherein the first shaping pressure is 32-35MPa, the shaping time is 2-2.5 hours, and the amount of the added atomized water vapor is 16-18% of the total mass of the mixed raw materials; the pressure of the second molding is 50-60MPa, the molding time is 1-2 hours, the amount of the added atomized water vapor is 16-18% of the total mass of the mixed raw materials, and the particle size of the molded ceramsite is 0.1-0.3mm until the mixture forms round particles.
(4) And (3) putting the prepared ceramsite into a dryer for drying, wherein the temperature of the dryer is set to be 110-120 ℃, the rotating speed of a conveyor belt is set to be 15-25 revolutions per hour, and the spreading thickness of the ceramsite is 0.5-0.8cm.
(5) And (3) transferring the baked ceramsite into a rotary kiln through a conveyor belt to be fired, wherein the temperature of the kiln head of the rotary kiln is 1200-1250 ℃, the temperature of the kiln tail of the rotary kiln is 320-330 ℃, and discharging the ceramic from the kiln after 7.5-8 hours to obtain a finished product.
As a preferred embodiment of the present invention, the waste tile used is a tile having a surface with no color pattern.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, the aluminum slag and the waste ceramic tiles are added into the raw materials, so that the pollution to the environment is reduced, waste is changed into valuable, the aluminum slag contains silicon oxide, the ceramic tiles contain calcium carbonate and talcum, the raw materials are mixed together, the specific surface area of the ceramic particles can be increased, the synergistic effect is achieved, and meanwhile, the calcium oxide in the aluminum slag can play the role of an expanding agent, so that the density of the ceramic particles is reduced.
2. The homogenization process is added in the raw material mixing process, so that all materials are fully and uniformly mixed, the stable quality of the product is ensured, the reaction rate is increased, and the strength of the ceramsite is enhanced.
3. The prepared ceramsite is firstly put into a dryer to be dried at low temperature and then is baked at high temperature in a rotary kiln, so that the ceramsite can more effectively produce physical and chemical reactions, thereby improving the strength of the ceramsite and reducing the density of the ceramsite.
Drawings
FIG. 1 is a schematic diagram of the preparation of the high-strength low-density ceramsite of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the invention, the aluminum slag and the waste ceramic tiles are added into the raw materials, so that the pollution to the environment is reduced, the aluminum slag contains silicon oxide, the ceramic tiles contain calcium carbonate and talcum, the specific surface area of the calcium carbonate can be effectively increased by surface modification and by utilizing the self porous property of the calcium carbonate, and meanwhile, the silicon oxide and the talcum contained in the raw materials can play a synergistic effect together with the calcium carbonate. The aluminum slag contains calcium oxide, which is an inorganic compound commonly called quicklime, and the chemical formula of the calcium oxide is CaO. When calcium oxide reacts with water, calcium hydroxide is generated and a large amount of heat is released, and the reaction causes volume increase, so that an expansion effect is generated, and the calcium oxide can play a role of an expanding agent, so that the density of the ceramsite is reduced.
The homogenization process adopted in the invention can fully and uniformly mix all materials, thereby achieving uniform chemical component distribution, ensuring stable quality of products, increasing reaction rate and enhancing strength of ceramsite.
The method comprises the steps of putting the prepared ceramsite into a dryer with a conveyor belt for baking, transferring the baked ceramsite into a rotary kiln for baking through the conveyor belt, and thus, the middle differentiation chemical components of the ceramsite can be prevented from being damaged by directly adopting a low-temperature baking mode. The low temperature of 110-120 ℃ can promote the inside of the ceramsite to generate physical and chemical reactions, such as oxidation reaction and the like, thereby being beneficial to forming more pores, the high temperature baking of 1200-1250 ℃ can generate complex physical and chemical reactions, such as melting, sintering and the like, in the ceramsite, and the reactions are beneficial to forming communicated pore channels in the ceramsite, thereby increasing the porosity.
The waste ceramic tile used in the invention is ceramic tile with an achromatic surface, aluminum slag is produced in industry, and other raw materials are all commercial raw materials.
Example 1
A preparation method of low-density ceramsite comprises the following specific steps: (1) Putting the waste ceramic tiles into a coarse crusher for crushing, wherein the mesh number of a screen of the crusher is 50 meshes, the rotating speed is set to 800 turns/min, ball milling is carried out on the coarsely crushed ceramic tiles through a ball mill, the rotating speed of the ball mill is set to 90 turns/min, the mesh number after fine crushing is 500 meshes, and bauxite, aluminum slag, talcum powder, calcium carbonate and mullite raw materials are respectively crushed and ball milled to 500 meshes.
(2) 45 Parts of bauxite, 25 parts of aluminum slag, 10 parts of waste ceramic tile powder, 3 parts of talcum powder, 2 parts of calcium carbonate and 1.5 parts of mullite are mixed and homogenized according to a certain proportion, wherein the homogenization setting parameters are that the homogenization pressure is 4MP, the working medium temperature is 55 ℃, the rotating speed is 9000 revolutions per minute, and the homogenization time is 10 minutes.
(3) Adding the mixed and homogenized raw materials into a granulator for granulating and forming twice, and simultaneously adding atomized water vapor, wherein the first forming pressure is 32MPa, the forming time is 2 hours, and the amount of the added atomized water vapor is 16% of the total mass of the mixed raw materials; the pressure of the second molding is 50MPa, the molding time is 1 hour, the amount of the added atomized water vapor is 16% of the total mass of the mixed raw materials, and the particle size of the molded ceramsite is 0.15mm until the mixture forms round particles.
(4) And (3) putting the prepared ceramsite into a dryer for drying, wherein the temperature of the dryer is set to be 110 ℃, the rotating speed of a conveyor belt is set to be 15 revolutions per hour, and the spreading thickness of the ceramsite is 0.5cm.
(5) And (3) transferring the baked ceramsite into a rotary kiln through a conveyor belt to be fired, wherein the temperature of the kiln head of the rotary kiln is 1200 ℃, the temperature of the kiln tail of the rotary kiln is 320 ℃, and discharging the ceramic from the kiln after 8 hours to obtain a finished product.
Example two
A preparation method of low-density ceramsite comprises the following specific steps: (1) Putting the waste ceramic tiles into a coarse crusher for crushing, wherein the mesh number of a screen of the crusher is 50 meshes, the rotating speed is set to 800 turns/min, ball milling is carried out on the coarsely crushed ceramic tiles through a ball mill, the rotating speed of the ball mill is set to 90 turns/min, the mesh number after fine crushing is 500 meshes, and bauxite, aluminum slag, talcum powder, calcium carbonate and mullite raw materials are respectively crushed and ball milled to 500 meshes.
(2) 55 Parts of bauxite, 30 parts of aluminum slag, 13 parts of waste ceramic tile powder, 5 parts of talcum powder, 3 parts of calcium carbonate and 3 parts of mullite are mixed and homogenized according to a certain proportion, wherein the homogenization setting parameters are that the homogenization pressure is 3.5MP, the working medium temperature is 60 ℃, the rotating speed is 8500 revolutions per minute, and the homogenization time is 15 minutes.
(3) Adding the mixed and homogenized raw materials into a granulator for granulating and forming twice, and simultaneously adding atomized water vapor, wherein the first forming pressure is 35MPa, the forming time is 2.5 hours, and the amount of the added atomized water vapor is 18% of the total mass of the mixed raw materials; the pressure of the second molding is 60MPa, the molding time is 1 hour, and the amount of the added atomized water vapor is 18% of the total mass of the mixed raw materials; the particle size of the formed ceramsite is 0.163mm until the mixture forms round particles.
(4) And (3) putting the prepared ceramsite into a dryer for drying, wherein the temperature of the dryer is set to 115 ℃, the rotating speed of a conveyor belt is set to 20 revolutions per hour, and the spreading thickness of the ceramsite is 0.7cm.
(5) And (3) transferring the baked ceramsite into a rotary kiln through a conveyor belt to be fired, wherein the temperature of the kiln head of the rotary kiln is 1250 ℃, the temperature of the kiln tail of the rotary kiln is 330 ℃, and discharging the ceramic from the kiln after 7.5 hours to obtain a finished product.
Example III
A preparation method of low-density ceramsite comprises the following specific steps: (1) Putting the waste ceramic tiles into a coarse crusher for crushing, wherein the mesh number of a screen of the crusher is 50 meshes, the rotating speed is set to 800 turns/min, ball milling is carried out on the coarsely crushed ceramic tiles through a ball mill, the rotating speed of the ball mill is set to 90 turns/min, the mesh number after fine crushing is 500 meshes, and bauxite, aluminum slag, talcum powder, calcium carbonate and mullite raw materials are respectively crushed and ball milled to 500 meshes.
(2) 50 Parts of bauxite, 28 parts of aluminum slag, 12 parts of waste ceramic tile powder, 4 parts of talcum powder, 2.5 parts of calcium carbonate and 2 parts of mullite are mixed and homogenized according to a certain proportion, wherein the homogenization setting parameters are that the homogenization pressure is 3.8MP, the working medium temperature is 58 ℃, the rotating speed is 8800 r/min, and the homogenization time is 13 min.
(3) Adding the mixed and homogenized raw materials into a granulator for granulating and forming twice, and simultaneously adding atomized water vapor, wherein the first forming pressure is 33MPa, the forming time is 2 hours, and the amount of the added atomized water vapor is 17% of the total mass of the mixed raw materials; the pressure of the second molding is 55MPa, the molding time is 2 hours, and the amount of the added atomized water vapor is 17% of the total mass of the mixed raw materials; the particle size of the formed ceramsite is 0.2mm until the mixture forms round particles.
(4) And (3) putting the prepared ceramsite into a dryer for drying, wherein the temperature of the dryer is set to 116 ℃, the rotating speed of a conveyor belt is set to 25 revolutions per hour, and the tiled thickness of the ceramsite is 0.6cm.
(5) And (3) transferring the baked ceramsite into a rotary kiln through a conveyor belt to be fired, wherein the temperature of the kiln head of the rotary kiln is 1230 ℃, the temperature of the kiln tail of the rotary kiln is 325 ℃, and discharging the ceramic from the kiln after 8 hours to obtain a finished product.
Example IV
A preparation method of low-density ceramsite comprises the following specific steps: (1) Putting the waste ceramic tiles into a coarse crusher for crushing, wherein the mesh number of a screen of the crusher is 50 meshes, the rotating speed is set to 800 turns/min, ball milling is carried out on the coarsely crushed ceramic tiles through a ball mill, the rotating speed of the ball mill is set to 90 turns/min, the mesh number after fine crushing is 500 meshes, and bauxite, aluminum slag, talcum powder, calcium carbonate and mullite raw materials are respectively crushed and ball milled to 500 meshes.
(2) 52 Parts of bauxite, 27 parts of aluminum slag, 11 parts of waste ceramic tile powder, 4 parts of talcum powder, 2.5 parts of calcium carbonate and 2.5 parts of mullite are mixed and homogenized according to a proportion, wherein the homogenization setting parameters are that the homogenization pressure is 3.6MP, the working medium temperature is 60 ℃, the rotating speed is 8700 r/min, and the homogenization time is 14 minutes.
(3) Adding the mixed and homogenized raw materials into a granulator for granulating and forming twice, and simultaneously adding atomized water vapor, wherein the first forming pressure is 32MPa, the forming time is 2 hours, and the amount of the added atomized water vapor is 16% of the total mass of the mixed raw materials; the pressure of the second molding is 50MPa, the molding time is 2 hours, and the amount of the added atomized water vapor is 16% of the total mass of the mixed raw materials; the particle size of the formed ceramsite is 0.19mm until the mixture forms round particles.
(4) And (3) putting the prepared ceramsite into a dryer for drying, wherein the temperature of the dryer is set to 118 ℃, the rotating speed of a conveyor belt is set to 18 revolutions per hour, and the spreading thickness of the ceramsite is 0.6cm.
(5) And (3) transferring the baked ceramsite into a rotary kiln through a conveyor belt to be fired, wherein the temperature of the kiln head of the rotary kiln is 120 ℃, the temperature of the kiln tail of the rotary kiln is 328 ℃, and discharging the ceramic from the kiln after 8 hours to obtain a finished product.
Comparative example one: based on the second embodiment, 30 parts of aluminum slag in the step (2) is removed, 85 parts of bauxite is changed, and the rest is the same as the embodiment.
Comparative example two: on the basis of the second embodiment, 13 parts of the waste ceramic tile powder in the step (2) is removed, 68 parts of bauxite is changed, and the rest is the same as the embodiment.
Comparative example three: on the basis of the second example, the homogenization process in step (2) was removed, and the remainder was the same as in the example.
Comparative example four: on the basis of the second embodiment, the baking process in the step (4) is removed, and the rest is the same as the embodiment.
The low-density high-strength ceramsite proppants obtained in the examples and the comparative examples are tested according to SY/T5108-2006 and SY/T5108, and the test results are shown in Table 1:
TABLE 1
The volume density of the first, second, third and fourth comparative examples is higher than that of the second comparative example, the high amplitude is more than 7%, and the compressive strength is lower than that of the second comparative example. In the second example, the apparent density and the breakage rate are both better than those of the comparative example. Therefore, the high-strength low-density ceramsite provided by the invention has the advantages of higher strength, lower density, low cost and wide application prospect.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications and the like made on the basis of the present invention to solve the substantially same technical problems and achieve the substantially same technical effects are included in the scope of the present invention.

Claims (5)

1. A preparation method of low-density ceramsite is characterized in that bauxite, aluminum slag and waste ceramic tiles are used as main raw materials, talcum powder, calcium carbonate and mullite are added at the same time, and the high-strength low-density ceramsite is obtained through crushing, homogenizing, granulating, baking and sintering, and the process steps are as follows:
(1) Putting the waste ceramic tiles into a coarse crusher for crushing, wherein the mesh number of a screen of the crusher is 50 meshes, the rotating speed is set to 800 revolutions per minute, ball milling is carried out on the coarse crushed ceramic tiles through a ball mill, the mesh number after crushing is 500 meshes, and ball milling is carried out on bauxite, aluminum slag, talcum powder, calcium carbonate and mullite raw materials respectively until the mesh number is 500 meshes;
(2) And (3) mixing the powder obtained in the step (1): 45-55 parts of bauxite, 25-30 parts of aluminum slag, 10-13 parts of waste ceramic tile powder, 3-5 parts of talcum powder, 2-3 parts of calcium carbonate and 1.5-3 parts of mullite are mixed and homogenized according to the proportion;
Adding the mixed and homogenized raw materials into a granulator for granulating and forming, adding atomized water vapor until the mixture forms round granules, and sieving with a 50-mesh sieve to obtain round spherical ceramsite;
(4) And (3) putting the prepared ceramsite into a dryer with a conveyor belt for baking, and transferring the baked ceramsite into a rotary kiln through the conveyor belt for baking to obtain a finished product.
2. The method for preparing the low-density ceramic particles according to claim 1, wherein the method comprises the following steps: the rotation speed of the ball mill is 90 revolutions per minute, the homogenization setting parameters are that the pressure is 3.5-4MPa, the temperature of the working medium is 55-60 ℃, the rotation speed is 8500-9000 revolutions per minute, and the homogenization time is 10-15 minutes.
3. The method for preparing the low-density ceramic particles according to claim 1, wherein the method comprises the following steps: in the step (3), the granulation and the molding are carried out twice, the first molding pressure is 32-35MPa, the molding time is 2-2.5 hours, and the amount of the added atomized water vapor is 16-18% of the total mass of the mixed raw materials; the second molding pressure is 50-60MPa, the molding time is 1-2 hours, and the amount of the added atomized water vapor is 16-18% of the total mass of the mixed raw materials; the particle size of the formed ceramsite is 0.1-0.3mm.
4. The method for preparing the low-density ceramic particles according to claim 1, wherein the method comprises the following steps: the temperature of the dryer is 110-120 ℃, the rotating speed of the conveyor belt is 15-25 revolutions per hour, and the spreading thickness of the ceramsite is 0.5-0.8cm.
5. The method for preparing the low-density ceramic particles according to claim 1, wherein the method comprises the following steps: the kiln head temperature of the rotary kiln is 1200-1250 ℃, the kiln tail temperature is 320-330 ℃, and the rotary kiln is discharged after 7.5-8 hours.
CN202410517261.4A 2024-04-28 2024-04-28 Preparation method of low-density ceramsite Pending CN118084457A (en)

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