CN102001832B - Preparation method of foam glass particles - Google Patents

Abstract

A method for preparing foam glass particles. First, glass balls are ground to 200 mesh to form glass powder, and glass powder, sodium nitrate, manganese dioxide, ferric oxide and sodium silicate are mixed to make batch materials; A number of cylindrical grooves are evenly drilled on the surface to make a granular foam formwork; the batching materials are evenly injected into the cylindrical grooves of the granular foam formwork and fired in a roller kiln. The sample was poured out to obtain foam glass particles. The invention utilizes a template method to produce foam glass particles, and the prepared foam glass particles have narrow size distribution, uniform particle size and high production efficiency. The foam glass particles prepared according to the preparation method of the invention have good structural strength, low water absorption, low thermal conductivity and high closed porosity, and can be used as excellent thermal insulation materials. The preparation process of the invention is simple in operation, low in cost, energy-saving and environment-friendly, and is suitable for industrialized batch production.

Description

A kind of preparation method of cellular glass particle

technical field

The invention relates to a method for manufacturing foam glass, in particular to a method for preparing foam glass particles.

Background technique

Foam glass is made of waste glass, fly ash, mica, perlite, pumice powder, volcanic ash and other substances rich in glass phase as the main raw materials, adding foaming agent, modifier, accelerator, etc., finely pulverized and uniformly mixed The ingredients are placed in a specific mold and heated at a temperature of 750-900°C to soften, foam and anneal the glass to form a porous glass material filled with numerous uniform bubbles inside.

Foam glass has physical properties such as low density, high strength, and small thermal conductivity. It not only has the inherent permanence, safety, reliability, chemical corrosion resistance, and ant-mouse resistance of glass materials, but also has the advantages of being compatible with other buildings. Compared with materials, it also has a series of superior properties such as thermal insulation, waterproof and moisture-proof, fireproof, acid and alkali resistance, low density, high mechanical strength, and sound absorption.

Granular foam glass is a new type of environmentally friendly thermal insulation material developed from foam glass (Chen Hui, Xu Jinyu. New thermal insulation material-TECHNOpor glass foam glass particles [J]. New Building Materials, 2007 (9): 53), its It is quite versatile. It can be used for walls, roofs, the bottom of swimming pools, the foundation of parking garages and the roof of parking lots; it can be used for buildings under construction or renovation; it can be used for slope reinforcement, the slope can reach 45°, and it can also beautify the landscape; it can be used for cars Sidewalks and sidewalks; for low-energy residential buildings and buildings with environmental requirements.

Japan Chemical Products Industry Co., Ltd. No. 63-65617 has introduced a method for manufacturing glass foam particles. In the process, glass powder and inorganic foaming agent are consolidated and granulated by a binder. After granulation, the granules are sized and coated. Anti-adhesive agent, fired and foamed in a rotary kiln, this kind of glass foamed particles is mainly used as heat insulation material, skeleton and sound-absorbing material. In the past, disc-type granulators were commonly used for granulation. The disadvantages are that the particle size distribution is wide, and the particles need to be screened, and the particles are bonded. Japanese Patent Application No. 53-1402424 proposes to make the glass-foaming agent mixed powder into noodles, and then burn it. A method of surface foaming glass particles. However, this method cannot obtain particles with uniform particle size. Moreover, the noodle-shaped semi-finished product is fragile and easy to stick, and it is easy to stick to the furnace wall when firing.

CN10774764A discloses a glass block with a large number of holes, the color is white, the size of the holes is 0.5-2mm, and the holes are evenly distributed. Through the adjustment of the added amount of foamed plastic particles, the holes are connected with each other. The glass raw material is a powder made by grinding waste glass shards into which foamed plastic particles are mixed. Through the heat treatment and sintering process, the space-occupiers decompose to form holes, and the glass powder is sintered into a porous block. These holes increase the surface area of the glass, reduce the apparent density of the block, and improve sound absorption and thermal insulation. However, this method cannot be used to prepare granular cellular glass.

Sun Ke, et al (Sun Ke, Zeng Lei, Wang Tao, Liu Zhonghai. Preparation of macroporous porous glass particles in a fast stirring granulator [J]. Silicate Bulletin, 2006, 25(4): 172-175) The effects of water addition, granulation time and stirring method on the granulation process of macroporous glass particles in the fast stirring granulator were investigated, and the influence of sintering temperature on the strength and porosity of the particles was studied. The density of foam glass particles prepared by this method is relatively large, and the surface opening ratio of the particles is high. At the same time, the particle size distribution of the particles prepared by the stirring granulation method is relatively wide.

In recent years, with further research and development on the application of granular foam glass, it is found that when granular foam glass is used as a thermal insulation material, the wide particle distribution range greatly limits its use as an excellent thermal insulation material and filling material. The use effect of materials, how to prepare foam glass particles with narrow particle size distribution, simple preparation process and excellent performance have become problems that need to be solved urgently in the production of foam glass particles.

Contents of the invention

The purpose of the present invention is to overcome the shortcoming of above-mentioned prior art, a kind of method that adopts template method to prepare cellular glass particle is provided. The foam glass particles prepared by the invention have the same particle size, low density, high strength and small thermal conductivity, and can be used as excellent building thermal insulation materials and filling materials.

In order to achieve the above object, the preparation method adopted in the present invention is:

The first step: preparation of batch materials: firstly, wash, dry, crush and ball-mill the various cullets collected to 200 mesh to form glass powder; secondly, mix 94% glass powder and 3% nitric acid according to the mass fraction Sodium, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture with a uniformity greater than 98%; then, spray the mixture into the mixer The atomized water of 5% of the material is mixed again for 30 minutes to form a batch for preparing foam glass particles;

Step 2: Preparation of foamed formwork with granules: first, polish the surface of the foamed formwork; secondly, evenly drill several cylindrical grooves with a diameter of 2 to 5mm and a depth of 2 to 4mm on the smooth polished surface , and clean the foaming template and the cylindrical groove; then, evenly spray the alumina water grinding slurry with a particle size of 400 mesh on the surface of the foaming template and the surface of the cylindrical groove, and make granular foam after natural drying template;

The third step: the preparation of foam glass particles: first, inject the batch material evenly into the cylindrical groove of the granular foam formwork, and the filling height is equal to the granular foam formwork; then, push the granular foam formwork Put it into a roller kiln, and fire it according to the following system: at a heating rate of 2 °C/min, raise the temperature from room temperature to 600 °C, keep it for 20-30 min, then raise the temperature at a heating rate of 5 °C/min to 760 °C, and keep it for 10 minutes. ~30min, then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

The cullet of the present invention adopts common plate glass, bottle glass;

The foam formwork is made of alumina, sillimanite, silicon carbide or mullite refractory materials;

The 400-mesh alumina water grinding slurry sprayed on the inner wall of the foam formwork is prepared by ball milling 95% alumina and 5% kaolin plus water and passing through a 400-mesh standard sieve, and the spraying thickness is less than 0.5mm.

The invention utilizes a template method to produce foam glass particles, and the prepared foam glass particles have narrow size distribution, uniform particle size and high production efficiency. The foam glass particles prepared according to the preparation method of the invention have good structural strength, low water absorption, small thermal conductivity and high closed porosity, and can be used as excellent thermal insulation materials. The preparation process of the invention is simple in operation, low in cost, energy-saving and environment-friendly, and is suitable for industrialized batch production.

Description of drawings

Fig. 1 is a schematic diagram of a foaming template used in the preparation of foam glass particles in the present invention. Among them, 1 is a foam template, and 2 is a cylindrical groove

Detailed ways

Embodiment 1, the first step: the preparation of batch materials: first, the various cullets collected are cleaned, dried, broken, and ball-milled to 200 mesh to form glass powder; secondly, according to the mass fraction, 94% of the glass powder, 3% sodium nitrate, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture whose uniformity is greater than 98%; then, to the mixer Spray 5% of the atomized water into the mixture, and then mix the mixture for 30 minutes to form a batch for preparing foam glass particles;

The second step: see Figure 1, the preparation of the granular foam template: first, the surface of the foam template 1 made of alumina with a size of 600mm×400mm×40mm is polished and smoothed; secondly, it is evenly polished on the flat polished surface Drill several cylindrical grooves 2 with a diameter of 2 mm and a depth of 2 mm, and clean the foam template 1 and cylindrical groove 2; then, spray the alumina water grinding slurry with a particle size of 400 mesh evenly on the foam template 1 surface and cylindrical groove 2 surface layer, after natural drying, it is made into granular foam template;

The 400-mesh alumina water grinding slurry is prepared by adding water with a mass fraction of 95% alumina and 5% kaolin, passing through a 400-mesh standard sieve after ball milling, and the spraying thickness is less than 0.5mm;

The third step: the preparation of foam glass particles: first, inject the batching material evenly into the cylindrical groove 2 of the granular foam formwork, and the filling height is equal to that of the granular foam formwork; then, inject the granular foam formwork 1 Push it into the roller kiln, and fire it according to the following system: heat up from room temperature to 600°C at a heating rate of 2°C/min, hold for 20 minutes, then raise the temperature to 760°C at a heating rate of 5°C/min, and hold for 10 minutes , and then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

Embodiment 2, the first step: preparation of batch materials: firstly, the various cullets collected are cleaned, dried, broken, and ball-milled to 200 mesh to form glass powder; secondly, according to the mass fraction, 94% of the glass powder, 3% sodium nitrate, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture whose uniformity is greater than 98%; then, to the mixer Spray 5% of the atomized water into the mixture, and then mix the mixture for 30 minutes to form a batch for preparing foam glass particles;

Step 2: Preparation of foamed formwork with granules: firstly, the surface of the foamed formwork 1 made of sillimanite with a size of 600mm×400mm×40mm is ground and smoothed; secondly, the surface is uniformly drilled out on the flat ground surface A number of cylindrical grooves 2 with a diameter of 3 mm and a depth of 2 mm, and the foaming formwork 1 and cylindrical grooves 2 are cleaned; then, the alumina water grinding slurry with a particle size of 400 mesh is evenly sprayed on the surface of the foaming formwork 1 and The surface layer of cylindrical groove 2 is made into granular foam template after natural drying;

The 400-mesh alumina water grinding slurry is prepared by adding water with a mass fraction of 95% alumina and 5% kaolin, passing through a 400-mesh standard sieve after ball milling, and the spraying thickness is less than 0.5mm;

The third step: the preparation of foam glass particles: first, inject the batching material evenly into the cylindrical groove 2 of the granular foam formwork, and the filling height is equal to that of the granular foam formwork; then, inject the granular foam formwork 1 Push it into the roller kiln, and fire it according to the following system: at a heating rate of 2 °C/min, raise the temperature from room temperature to 600 °C, keep it for 22 minutes, then raise the temperature at a rate of 5 °C/min to 760 °C, and keep it for 12 minutes , and then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

Embodiment 3, the first step: the preparation of batch material: firstly, various cullets collected are cleaned, dried, crushed, and ball-milled to 200 mesh to form glass powder; secondly, according to the mass fraction, 94% of the glass powder, 3% sodium nitrate, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture whose uniformity is greater than 98%; then, to the mixer Spray 5% of the atomized water into the mixture, and then mix the mixture for 30 minutes to form a batch for preparing foam glass particles;

Step 2: Preparation of foamed formwork with granules: First, polish the surface of the foamed formwork 1 made of silicon carbide with a size of 600mm×400mm×40mm; a cylindrical groove 2 with a diameter of 3 mm and a depth of 3 mm, and clean the foam template 1 and the cylindrical groove 2; The surface layer of the groove 2 is made into a granular foam template after natural drying;

The 400-mesh alumina water grinding slurry is prepared by adding water with a mass fraction of 95% alumina and 5% kaolin, passing through a 400-mesh standard sieve after ball milling, and the spraying thickness is less than 0.5mm;

The third step: the preparation of foam glass particles: first, inject the batching material evenly into the cylindrical groove 2 of the granular foam formwork, and the filling height is equal to that of the granular foam formwork; then, inject the granular foam formwork 1 Push it into the roller kiln, and fire it according to the following system: heat up from room temperature to 600°C at a heating rate of 2°C/min, hold for 25 minutes, then raise the temperature to 760°C at a heating rate of 5°C/min, and hold for 15 minutes , and then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

Embodiment 4, the first step: the preparation of batch material: firstly, the various cullets collected are washed, dried, crushed, and ball-milled to 200 mesh to form glass powder; secondly, according to the mass fraction, 94% of the glass powder, 3% sodium nitrate, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture whose uniformity is greater than 98%; then, to the mixer Spray 5% of the atomized water into the mixture, and then mix the mixture for 30 minutes to form a batch for preparing foam glass particles;

The second step: the preparation of the foaming formwork with particles: first, the surface of the foaming formwork 1 made of mullite with a size of 600mm×400mm×40mm is polished and smooth; A number of cylindrical grooves 2 with a diameter of 4mm and a depth of 3mm, and the foaming template 1 and cylindrical grooves 2 are cleaned; The surface layer of cylindrical groove 2 is made into granular foam template after natural drying;

The 400-mesh alumina water grinding slurry is prepared by adding water with a mass fraction of 95% alumina and 5% kaolin, passing through a 400-mesh standard sieve after ball milling, and the spraying thickness is less than 0.5mm;

The third step: the preparation of foam glass particles: first, inject the batching material evenly into the cylindrical groove 2 of the granular foam formwork, and the filling height is equal to that of the granular foam formwork; then, inject the granular foam formwork 1 Push it into the roller kiln, and fire it according to the following system: heat up from room temperature to 600°C at a heating rate of 2°C/min, hold for 26 minutes, then raise the temperature to 760°C at a heating rate of 5°C/min, and hold for 20 minutes , and then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

Embodiment 5, the first step: the preparation of batch materials: first, the various cullets collected are cleaned, dried, broken, and ball-milled to 200 mesh to form glass powder; secondly, according to the mass fraction, 94% of the glass powder, 3% sodium nitrate, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture whose uniformity is greater than 98%; then, to the mixer Spray 5% of the atomized water into the mixture, and then mix the mixture for 30 minutes to form a batch for preparing foam glass particles;

Step 2: Preparation of foamed formwork with granules: First, polish the surface of the foamed formwork 1 made of alumina with a size of 600mm×400mm×40mm; a cylindrical groove 2 with a diameter of 5 mm and a depth of 3 mm, and clean the foam template 1 and the cylindrical groove 2; The surface layer of the groove 2 is made into a granular foam template after natural drying;

The 400-mesh alumina water grinding slurry is prepared by adding water with a mass fraction of 95% alumina and 5% kaolin, passing through a 400-mesh standard sieve after ball milling, and the spraying thickness is less than 0.5mm;

The third step: the preparation of foam glass particles: first, inject the batching material evenly into the cylindrical groove 2 of the granular foam formwork, and the filling height is equal to that of the granular foam formwork; then, inject the granular foam formwork 1 Push it into the roller kiln, and fire it according to the following system: at a heating rate of 2 °C/min, raise the temperature from room temperature to 600 °C, keep it for 28 minutes, then raise the temperature at a rate of 5 °C/min to 760 °C, and keep it for 26 minutes , and then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

Embodiment 6, the first step: the preparation of batch materials: first, the various cullets collected are cleaned, dried, broken, and ball-milled to 200 mesh to form glass powder; secondly, according to the mass fraction, 94% of the glass powder, 3% sodium nitrate, 1% manganese dioxide, 1% ferric oxide, and 1% sodium silicate are put into the mixer and mixed to a mixture whose uniformity is greater than 98%; then, to the mixer Spray 5% of the atomized water into the mixture, and then mix the mixture for 30 minutes to form a batch for preparing foam glass particles;

The second step: the preparation of the foaming formwork with particles: first, the surface of the foaming formwork 1 made of mullite with a size of 600mm×400mm×40mm is polished and smooth; A number of cylindrical grooves 2 with a diameter of 3mm and a depth of 4mm, and the foaming template 1 and cylindrical grooves 2 are cleaned; The surface layer of cylindrical groove 2 is made into granular foam template after natural drying;

The 400-mesh alumina water grinding slurry is prepared by adding water with a mass fraction of 95% alumina and 5% kaolin, passing through a 400-mesh standard sieve after ball milling, and the spraying thickness is less than 0.5mm;

The third step: the preparation of foam glass particles: first, inject the batching material evenly into the cylindrical groove 2 of the granular foam formwork, and the filling height is equal to that of the granular foam formwork; then, inject the granular foam formwork 1 Push it into the roller kiln, and fire it according to the following system: heat up from room temperature to 600°C at a heating rate of 2°C/min, hold for 30 minutes, then raise the temperature to 760°C at a heating rate of 5°C/min, and hold for 30 minutes , and then cool down to room temperature at a cooling rate of 1°C/min, and pour the sample out from the granular foam template to obtain foam glass particles.

The invention utilizes a template method to produce foam glass particles, and the prepared foam glass particles have narrow size distribution, uniform particle size and high production efficiency. The foam glass particles prepared according to the preparation method of the invention have good structural strength, low water absorption, small thermal conductivity, high closed porosity and small specific gravity, and can be used as excellent thermal insulation materials. The preparation process of the invention is simple in operation, low in cost, energy-saving and environment-friendly, and is suitable for industrialized batch production. The prepared foam glass particles can be used as high-quality insulating materials for thermal insulation curtain walls, brick walls, concrete walls, thermal insulation floor tiles, floor boards, ceilings and floors of roofs and thermal insulation roofs; for refrigeration equipment, ships, refrigerated vehicles and isothermal compartments It can also be used for insulation of thermal equipment whose temperature does not exceed 300 °C.

Claims (4)

1. the preparation method of a foam glass particle is characterized in that carrying out according to the following steps:

The first step: the preparation of admixtion: at first, with the various glass cullet cleanings of collecting, oven dry, broken, ball milling to 200 order formation glass powder; Secondly, with 94% glass powder, 3% SODIUMNITRATE, 1% Manganse Dioxide, 1% red oxide of iron, 1% water glass are put into mixer and are mixed to uniformity coefficient greater than 98% compound according to massfraction; Then, in mixer, spray into the atomized water of compound 5%, batch mixing forms the admixtion of preparation foam glass particle after 30 minutes again;

Second step: the preparation of particle dress foaming template: at first, the template that will foam (1) surface finish is smooth; Secondly, on smooth buffed surface, getting out several diameters uniformly is 2～5mm, the cylindrical groove of dark 2～4mm (2), and will foam template (1) and cylindrical groove (2) are cleaned out; Then, be that 400 purpose aluminum oxide water mill slurries uniformly spray on foaming template (1) surface and cylindrical groove (2) top layer with granularity, promptly process particulate state foaming template behind the natural airing;

The 3rd step: the preparation of foam glass particle: at first, admixtion is injected the cylindrical groove (2) of particulate state foaming template uniformly, work loading height and the particulate state template that foams is equal; Then, the particulate state template (1) that foams is pushed in the roller kiln, burn till according to following system: with the heat-up rate of 2 ℃/min; Be warming up to 600 ℃ from room temperature; Insulation 20～30min, the heat-up rate with 5 ℃/min is warming up to 760 ℃ then, insulation 10～30min; Rate of temperature fall with 1 ℃/min is cooled to room temperature then, from particulate state foaming template, sample is poured out and promptly gets foam glass particle.

2. the preparation method of foam glass particle according to claim 1 is characterized in that: described glass cullet employing ordinary plate glass, container glass.

3. the preparation method of foam glass particle according to claim 1 is characterized in that: described foaming template (1) adopts aluminum oxide, sillimanite, silit or mullite refractory to process.

4. the preparation method of foam glass particle according to claim 1; It is characterized in that: 400 purpose aluminum oxide water mill slurries of described foaming template inner-wall spraying are to be that 95% aluminum oxide and 5% kaolin add water after cross 400 mesh standard sieves behind the ball milling and be prepared from massfraction, and coating thickness is less than 0.5mm.