阅读说明：本技术 一种采用干法制粉工艺制备发泡陶瓷原料的方法 (Method for preparing foamed ceramic raw material by adopting dry powder preparation process ) 是由 陶晓文 于 2020-07-23 设计创作，主要内容包括：本发明提供一种采用干法制粉工艺制备发泡陶瓷原料的方法,包括液态增湿剂的制备及发泡陶瓷原料的干法造粒过程,采用干法制粉工艺技术原理,将0.5～1.0%发泡剂分散在水中,通过在水中添加相关的悬浮剂,使发泡陶瓷用发泡剂均匀分散在水溶液,再将此水溶液“计量性”均匀喷洒在基础原料中,经造粒工序,制备成生产发泡陶瓷的粉料；将固相的发泡陶瓷用的发泡剂改性为液态增湿剂,喷洒到发泡陶瓷用基础原料中,克服了将固相发泡剂直接加入基础原料出现混合不均匀的现象,保证了发泡陶瓷产品的性能。(The invention provides a method for preparing a foamed ceramic raw material by adopting a dry powder process, which comprises the steps of preparing a liquid humidifier and performing dry granulation on the foamed ceramic raw material, wherein the technical principle of the dry powder process is adopted, 0.5-1.0% of foaming agent is dispersed in water, the foaming agent for the foamed ceramic is uniformly dispersed in aqueous solution by adding related suspending agent into the water, the aqueous solution is uniformly sprayed in the basic raw material in a metering manner, and powder for producing the foamed ceramic is prepared through a granulation process; the foaming agent for the solid-phase foamed ceramics is modified into the liquid-state humidifying agent and sprayed into the basic raw material for the foamed ceramics, so that the phenomenon of uneven mixing caused by directly adding the solid-phase foaming agent into the basic raw material is overcome, and the performance of the foamed ceramic product is ensured.)

1. A method for preparing a foamed ceramic raw material by adopting a dry powder process is characterized by comprising the following steps:

preparation of liquid moisturizer: according to the proportion, the foaming agent, the suspending agent and the aqueous solution are respectively added into a first stirring tank and a second stirring tank after being metered, and the second stirring tank is used as a storage tank and is convenient to switch when in use; then the mixed liquid in the first stirring tank and the water in the third stirring tank are metered into a fourth stirring tank according to the proportion by a metering pump, and the mixture is fully stirred to form a liquid humidifying agent for dry granulation;

the dry granulation process of the foamed ceramic raw material comprises the following steps: firstly, the uniformly dispersed part of the fine powder, namely the fine powder from a linear compensation hopper, is quantitatively fed by an impeller feeder and enters a powder dispersion atomizer, and high-pressure air from a high-pressure fan simultaneously enters the powder dispersion atomizer to atomize and disperse the powder in a humidifying tower body; a humidifying tower body which is hollow with a certain structural shape, is internally provided with a high-pressure atomizing spray head assembly, generates atomized water from high-pressure water generated by an external high-pressure metering pump through the atomizing spray head assembly, and is in collision contact with dispersed and suspended powder, so that the surface tension of the humidifying liquid adsorbs and agglomerates dry fine powder to form a microparticle wrapping material, and the microparticle wrapping material falls to a rotating whole grain tray; thirdly, the granulating disc is a butterfly disc;

forming a microparticle wrapping material from the humidifying tower body, and dropping the microparticle wrapping material to a granulating disc in a special disc body shape, wherein when the disc body rotates, a suspension force and a centrifugal force are generated, and the microparticle wrapping material is integrated and optimized to form a solid granular material;

when the particle material reaches a certain particle size and volume weight, the particles are thrown out of the plate by the centrifugal action of the whole particle plate and flow out of the discharge hole;

wherein, the proportion of the foaming agent, the suspending agent and the aqueous solution in the step (1) is (0.5-1) to 2: 1.5.

2. The method of claim 1, wherein the first stirring tank, the second stirring tank and the third stirring tank of step (1) are disposed above the fourth stirring tank, and the first stirring tank, the second stirring tank and the third stirring tank are connected in series.

3. The method of claim 1, wherein the ceramic foam is prepared by a dry powder process, characterized in that the feeding device in the step (2) comprises a linear compensation hopper (1) and an impeller feeder (2), the powder is fed into a volute type disperser (4) through an impeller feeder (2), the volute type disperser (4) is externally connected with a high-pressure fan (3), powder is atomized and dispersed under the action of the volute type disperser (4) and enters the humidifying tower body (5), the upper part of the humidifying tower body (5) is a cylinder, the lower part is a cone structure, the upper cylinder is connected with the volute type disperser (4), the lower cone is connected with the granulating disc (9), the outer part of the upper cylinder of the humidifying tower body (5) is also connected with a high-pressure metering pump through a pipeline (6), and an atomizing nozzle (7) is arranged in the cylinder; the granulating disc (9) is a butterfly disc and is connected with a motor (10), a discharge hole (11) is formed below the granulating disc, and the motor (10) drives the granulating disc (9) to rotate; an exhaust port (8) is also arranged at the bottom of the cone at the lower part of the humidifying tower body (5).

4. The ceramic dry powder humidifying and granulating equipment of claim 1, wherein the roughness of the surface of the whole grain plate (9) is 3.0-5.0; the linear speed of the motor for driving the whole grain disc (9) to rotate is 5-8 m/s.

Technical Field

The invention relates to a method for preparing a foamed ceramic raw material by adopting a dry powder preparation process, belonging to the field of raw material processing equipment in the ceramic industry.

Background

In the ceramic industry, when raw materials are prepared, the raw materials are firstly ground to the fineness required by the process (the grinding process is divided into a wet process and a dry process), and then are prepared into granular powder meeting the process requirements in terms of granularity specification, fluidity and volume weight through a granulation process (the granulation process is also divided into the wet process and the dry process), so that the granular powder can be reacted with subsequent molding and sintering to produce corresponding terminal products.

The invention patent with the application number of 201711290525.3 discloses a ceramic raw material suspension granulation device, the performance of the powder prepared by the device is better than that of the powder prepared by a strong stirring and extruding method and the device, but the powder has low strength, and is easy to break in the process of powder storage and transportation, in addition, the powder has rough and unsmooth appearance, which affects the fluidity of the powder, is not beneficial to the forming performance of ceramic tiles, and affects the final product quality.

Disclosure of Invention

The foamed ceramic tile (board) as one new kind of building material has production process similar to that of traditional ceramic tile, and wet process for preparing material. The wet milling process has the defects of high investment and high energy consumption. The raw material preparation of the architectural ceramic tile also adopts a dry-process powder-making process, and has the advantages of low investment, low energy consumption, energy conservation and emission reduction, and is accepted by the industry. The raw material system of the foaming ceramic tile (board) is similar to that of the traditional ceramic tile, and the main difference of the core technology is that a foaming agent is added into a basic raw material system and a formula, wherein the addition amount of the foaming agent is about 0.5-1.0%. The small amount of solid-phase foaming agent can not be uniformly mixed with 99.0-99.5% of base raw materials by a solid-solid phase method.

Although the energy consumption of the existing dry granulation process technology is much lower than that of the wet granulation process by drying 10-12% of water during granulation to 6-8% of pressed powder with pressed water, the addition amount of the foaming agent is about 0.5-1.0%. The small amount of foaming agent, the solid-phase foaming agent and 99.0-99.5% of basic raw materials are mixed by a dry method process, so that the raw materials are difficult to uniformly mix, the stability of the components of the raw material formula is influenced, and the foaming performance and the product performance of the foamed ceramic tile are further influenced. The subsequent production process is affected, and the final product quality is affected.

The invention patent with the application number of CN201811608214.1 provides a ceramic dry powder humidifying and granulating device, which comprises a feeding device and a humidifying tower body, wherein a powder material and atomized water are combined in the humidifying tower to form loose particles, a whole grain tray is added, the loose particles are shaped by the whole grain tray to become compact, the surface smoothness of the particles is improved, the purpose of improving the performance of the powder material is achieved, the surface roughness of the whole grain tray is 3.0-5.0, the parameters and the performance of the prepared powder material are best when the linear speed of the rotation of the whole grain tray driven by a motor is 5-8 m/s, the particle size distribution of the powder material is improved, and the index of the fluidity is improved.

The patent solves the problems of powder particle size distribution and fluidity of the powder, and when the device is used for preparing foamed ceramics, the solid-solid phase foaming agent and 99.0-99.5% of basic raw materials are mixed by a dry method, so that the uniform mixing of the raw materials is difficult to realize, the stability of the components of the raw material formula is influenced, and the foaming performance and the product performance of the foamed ceramic tile are further influenced.

Drawings

FIG. 1 is a schematic diagram of an apparatus for preparing a liquid moisturizer of the present invention;

FIG. 2 is a schematic structural diagram of a dry granulation process apparatus according to the present invention;

the device comprises a linear compensation hopper 1, an impeller feeder 2, a high-pressure fan 3, a volute type disperser 4, a humidifying tower body 5, a pipeline 6, an atomizing spray head 7, an exhaust port 8, a granulating disc 9, a motor 10, a discharge port 11, a first stirring tank 12, a second stirring tank 13, a third stirring tank 14 and a fourth stirring tank 15.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings: a method for preparing a foamed ceramic raw material by adopting a dry powder process comprises the following steps:

(1) preparation of liquid moisturizer: according to the proportion, the foaming agent, the suspending agent and the aqueous solution are respectively added into a first stirring tank and a second stirring tank after being metered, and the second stirring tank is used as a storage tank and is convenient to switch when in use; then the mixed liquid in the first stirring tank and the water in the third stirring tank are metered into a fourth stirring tank according to the proportion by a metering pump, and the mixture is fully stirred to form a liquid humidifying agent for dry granulation;

(2) the dry granulation process of the foamed ceramic raw material comprises the following steps: firstly, the uniformly dispersed part of the fine powder, namely the fine powder from a linear compensation hopper, is quantitatively fed by an impeller feeder and enters a powder dispersion atomizer, and high-pressure air from a high-pressure fan simultaneously enters the powder dispersion atomizer to atomize and disperse the powder in a humidifying tower body; a humidifying tower body which is hollow with a certain structural shape, is internally provided with a high-pressure atomizing spray head assembly, generates atomized water from high-pressure water generated by an external high-pressure metering pump through the atomizing spray head assembly, and is in collision contact with dispersed and suspended powder, so that the surface tension of humidifying liquid (water nuclei) adsorbs and agglomerates dry fine powder to form micro-particle wrapping materials, and the micro-particle wrapping materials fall to a rotating whole grain tray; and thirdly, the whole grain tray is a butterfly tray. Form the microparticle parcel material from the humidification tower, fall whole grain dish, special disk body shape when rotatory, produces suspension force and centrifugal force, integrates, optimizes the microparticle parcel material, forms solid granule material. When the particle material reaches a certain particle size and volume weight, the particles are thrown out of the plate by the centrifugal action of the whole particle plate and flow out of the discharge hole;

wherein, the proportion of the foaming agent, the suspending agent and the aqueous solution in the step (1) is (0.5-1) to 2: 1.5.

The step (1) is characterized in that the first stirring tank 11, the second stirring tank 12 and the third stirring tank 13 are arranged above the fourth stirring tank 14, and the first stirring tank, the second stirring tank and the third stirring tank are of a series structure.

The feeding device in the step (2) comprises a linear compensation hopper 1 and an impeller feeder 2, the powder is fed by the impeller feeder 2 and enters a volute type disperser 4, the volute type disperser 4 is externally connected with a high-pressure fan 3, the powder is atomized and dispersed under the action of the volute type disperser 4 and enters a humidifying tower body 5, the upper part of the humidifying tower body 5 is a cylinder, the lower part of the humidifying tower body is of a cone structure, the upper cylinder is connected with the volute type disperser 4, the lower cone is connected with a granulating disc 9, the outer part of the cylinder at the upper part of the humidifying tower body 5 is also connected with a high-pressure metering pump through a pipeline 6, and an atomizing nozzle 7; the granulating disc 9 is a butterfly disc and is connected with a motor 10, a discharge hole 11 is arranged below the granulating disc 9, and the motor 10 drives the granulating disc 9 to rotate; the bottom of the cone at the lower part of the humidifying tower body 5 is also provided with an exhaust port 8.

The roughness of the surface of the whole grain plate 9 is 3.0-5.0; the linear speed of the motor driving the whole grain disc 9 to rotate is 5-8 m/s.

The solid foaming agent powder material is prepared into liquid humidifying agent by adding water and suspending agent according to the formula, and then is prepared into powder material for forming foamed ceramics by a dry granulation process for production. Dispersing 0.5-1.0% of foaming agent in water, adding related suspending agent in water to uniformly disperse the foaming agent for foamed ceramics in aqueous solution, uniformly spraying the aqueous solution in a metering manner in a basic raw material, and preparing powder for producing foamed ceramics through a granulation process. The powder prepared by the process method has better performance, and the process has the effects of saving investment, energy consumption and energy and reducing emission. The main problems to be solved are to solve the defects of large investment and high energy consumption of the traditional wet process of raw materials and to solve the problem of uneven solid phase addition of a small amount of foaming agent in the existing dry powder process.