CN112341237A - Method for firing light ceramsite by using waste casting resin sand - Google Patents
Method for firing light ceramsite by using waste casting resin sand Download PDFInfo
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- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
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Abstract
The invention discloses a method for firing light ceramsite by using waste casting resin sand, which belongs to the technical field of chemical product preparation, wherein the waste casting resin sand is obtained firstly, then the waste casting resin sand is treated, then the waste casting resin sand is subjected to magnetic separation treatment, then the waste casting resin sand, dehydrated sludge and clay are poured into a mixer to be uniformly stirred and mixed into mud, then the mud is extruded and granulated, then the extruded light ceramsite semi-finished product is dried and preheated, then the light ceramsite semi-finished product is subjected to high-temperature roasting, and finally the light ceramsite semi-finished product is cooled. Mineral salt, copper slag, red mud, coal gangue and a mixture of the mineral salt, the copper slag, the red mud and the coal gangue can be added into the mixture of the waste casting resin sand, the dewatered sludge and the clay, wherein the mineral salt can increase the overall mineral content of the materials, and can improve the waste utilization rate of the copper slag, the red mud and the coal gangue.
Description
Technical Field
The invention relates to the utilization of industrial byproducts, in particular to a method for firing light ceramsite by using waste casting resin sand.
Background
In the wet type casting production, it is inevitable that waste sand (including dust) is generated and thrown away. The problem is how much waste sand is. From the amount of raw sand (including the raw sand added during the blending of the sand for the sand core) in a foundry, it is possible to know how much waste sand to throw away. Since the amount of sand entering the plant is substantially equal to the amount of waste sand discharged. In other words, how much is added to the sand system and how much needs to be drained. A large amount of casting waste sand is urgently needed to be recycled. The industrial waste materials in the same circumstance as the casting waste sand also comprise sludge, copper slag, red mud and coal gangue, wherein the sludge mostly contains pathogenic bacteria, various heavy metals, toxic and difficultly-degraded substances and other harmful components, and the sludge must be properly treated and disposed to prevent secondary pollution and diffusion; the copper slag is the residue in the development of copper ore resources, and the utilization rate of the copper slag resources is low at present; the red mud is solid waste generated in the process of producing alumina by taking bauxite as a raw material; coal gangue is a solid waste discharged in coal mining and coal washing processes. The existing method for treating industrial wastes such as casting waste sand, sludge, copper slag, red mud, coal gangue and the like comprises landfill and preparation of light ceramsite.
Light haydite is ceramic particle. The ceramsite is also called light ceramsite sand because of the light weight. The light haydite is produced with clay or flyash, biological sludge and industrial waste as main material and through high temperature roasting and puffing, and has the features of low density, high strength, high water absorption, high heat insulating, fireproof, shock resisting, etc. and may be used to replace common sandstone to prepare light aggregate concrete, water treating filter material, adsorbent, permeable pavement material, culture medium for soilless culture in agriculture and garden, bridge deck, hollow block and other building material. However, the existing production process of the light ceramsite has a common treatment effect on industrial wastes such as casting waste sand, sludge, copper slag, red mud, coal gangue and the like, and the utilization rate is not high.
Disclosure of Invention
The invention aims to provide a method for firing light ceramsite by using waste foundry resin sand, which has the advantages of improving the waste utilization rate of copper slag, red mud and coal gangue, along with relatively simple and efficient preparation direction, and solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for firing light ceramsite by using waste foundry resin sand comprises the following steps:
s1: obtaining casting resin waste sand, wherein the cast resin molding sand is still in a high-temperature state, and when a cast and molded workpiece is taken out, the resin molding sand is cooled to normal temperature to obtain the casting resin waste sand;
s2: carrying out primary treatment on the waste casting resin sand, and then crushing and screening the waste casting resin sand;
s3: retreatment of the waste casting resin sand, magnetic separation treatment of the waste casting resin sand after being screened, and temporary storage of the waste casting resin sand in a sand hopper for later use after the magnetic separation;
s4: adding sludge for mixing, pouring the casting resin waste sand temporarily stored in a sand hopper into a mixer, simultaneously adding the dewatered sludge and the clay, uniformly stirring the three and mixing to obtain mud;
s5: extruding and granulating, namely conveying the mixture into an extruding and granulating machine, and outputting a light ceramsite semi-finished product by the extruding and granulating machine, wherein the light ceramsite semi-finished product is in an ellipsoid shape, and the particle size value of the light ceramsite semi-finished product is 2-7 mm;
s6: drying and preheating, namely conveying the light ceramsite semi-finished product into a dryer for drying treatment, wherein the drying temperature is controlled to be 50-90 ℃, the drying time is controlled to be 1-3 hours, the temperature of the dryer is increased to 150-200 ℃ after the drying process, and the preheating time is 20-30 min;
s7: high-temperature roasting, wherein the dried semi-finished product of the light ceramsite is quickly paved in a roasting tray and placed in roasting equipment for roasting, the roasting temperature is 1000-1200 ℃, and the roasting time is 30-75 minutes;
s8: and (4) cooling, and taking out the light ceramsite and naturally cooling when the furnace temperature of the roasting equipment is reduced to 150 ℃ after roasting.
Preferably, the dewatered sludge is domestic sludge, municipal sludge or industrial sludge and a mixture of the domestic sludge and the municipal sludge, the dewatered sludge is subjected to air drying treatment before being added into the mixer, the water content of the dewatered sludge reaches 25-35%, and the mass ratio of the casting resin waste sand to the dewatered sludge to the clay is 2:1: 1.
Preferably, mineral salt with the particle size of 0.2-0.5mm is added while stirring uniformly in S4.
Preferably, the particle size value of the semi-finished product of the light ceramsite in the S5 is 5-6 mm.
Preferably, the temperature for calcination in S7 is required to be sequentially increased and maintained:
wherein the roasting plate is arranged in the roasting equipment and needs to be preheated to more than 150 ℃;
when the roasting plate is placed in roasting equipment, the temperature needs to be raised;
when the furnace temperature is between 150 ℃ and 200 ℃, the temperature is raised for 20 to 30 minutes;
when the furnace temperature is 200 ℃, preserving the heat for 5-10 minutes;
when the furnace temperature is within the range of 200-500 ℃, the temperature is raised for 25-35 minutes;
when the furnace temperature is 500 ℃, preserving the heat for 10-15 minutes;
when the furnace temperature is in the range of 500-sintering temperature, the sintering temperature is 1000-1200 ℃, and the temperature is raised for 30-50 minutes;
when the furnace temperature is in the sintering temperature range, preserving the heat for 20-30 minutes, and stopping heating after the sintering is finished.
Preferably, copper slag, red mud, coal gangue and a mixture of the copper slag, the red mud and the coal gangue can be added while the mixture is uniformly stirred in the S4, and the mass of the added materials is less than that of the dehydrated sludge.
Preferably, before the extrusion granulation process, the water content of the mixture needs to be ensured to reach 15-30%, so that the mixture meets the extrusion requirement of an extrusion granulator.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for firing light ceramsite by using waste foundry resin sand, which comprises the steps of firstly obtaining waste foundry resin sand, then primarily treating the waste foundry resin sand, then retreating the waste foundry resin sand, then carrying out magnetic separation treatment on the screened waste foundry resin sand, then pouring the waste foundry resin sand temporarily stored in a sand hopper into a mixer, simultaneously adding dewatered sludge and clay, uniformly stirring and mixing the three into mud, then carrying out extrusion granulation, then drying and preheating the extruded light ceramsite semi-finished product, then carrying out high-temperature roasting on the light ceramsite semi-finished product, and finally cooling. Mineral salt, copper slag, red mud, coal gangue and a mixture of the mineral salt, the copper slag, the red mud and the coal gangue can be added into the mixture of the waste casting resin sand, the dewatered sludge and the clay, wherein the mineral salt can increase the overall mineral content of the materials, and can improve the waste utilization rate of the copper slag, the red mud and the coal gangue.
Drawings
FIG. 1 is a general functional block diagram of a first state of an embodiment of the present invention;
FIG. 2 is an overall schematic block diagram of a second embodiment of the present invention;
FIG. 3 is an overall schematic block diagram of a third embodiment of the present invention;
fig. 4 is an overall schematic block diagram in a fourth state according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, a method for firing light-weight ceramsite by using waste foundry resin sand includes the following steps:
the first step is as follows: obtaining casting resin waste sand, wherein the cast resin molding sand is still in a high-temperature state, and when a cast and molded workpiece is taken out, the resin molding sand is cooled to normal temperature to obtain the casting resin waste sand;
the second step is that: carrying out primary treatment on the waste casting resin sand, and then crushing and screening the waste casting resin sand;
the third step: retreatment of the waste casting resin sand, magnetic separation treatment of the waste casting resin sand after being screened, and temporary storage of the waste casting resin sand in a sand hopper for later use after the magnetic separation;
the fourth step: adding sludge for mixing, pouring the casting resin waste sand temporarily stored in a sand hopper into a mixer, simultaneously adding dewatered sludge and clay, uniformly stirring the three into mud, and mixing the mud, wherein the dewatered sludge is domestic sludge, municipal sludge or industrial sludge and a mixture of the domestic sludge and the municipal sludge, the dewatered sludge is subjected to air drying treatment before being added into the mixer, the water content of the dewatered sludge reaches 25-35%, and the mass ratio of the casting resin waste sand to the dewatered sludge to the clay is 2:1: 1;
the fifth step: carrying out extrusion granulation, namely conveying the mixture into an extrusion granulator, outputting a light ceramsite semi-finished product by the extrusion granulator, and ensuring that the water content of the mixture reaches 15% -30% before the extrusion granulation process so that the mixture meets the extrusion requirement of the extrusion granulator, wherein the light ceramsite semi-finished product is ellipsoidal, and the particle size value of the light ceramsite semi-finished product is 5-6 mm;
and a sixth step: drying and preheating, namely conveying the light ceramsite semi-finished product into a dryer for drying treatment, wherein the drying temperature is controlled to be 50-90 ℃, the drying time is controlled to be 1-3 hours, the temperature of the dryer is increased to 150-200 ℃ after the drying process, and the preheating time is 20-30 min;
the seventh step: high-temperature roasting, wherein the dried semi-finished product of the light ceramsite is quickly paved in a roasting tray and is placed in roasting equipment for roasting, the roasting temperature is 1000-1200 ℃, the roasting time is 30-75 minutes, the roasting temperature needs to be sequentially heated and kept, wherein the roasting tray needs to be preheated to be higher than 150 ℃ before being placed in the roasting equipment, the roasting tray needs to be heated after being placed in the roasting equipment, the temperature is heated for 20-30 minutes when the furnace temperature is 150-200 ℃, the temperature is kept for 5-10 minutes when the furnace temperature is 200 ℃, the temperature is heated for 25-35 minutes when the furnace temperature is 200-500 ℃, the temperature is kept for 10-15 minutes when the furnace temperature is 500-200 ℃, the roasting temperature is 1000-1200 ℃, the temperature is heated for 30-50 minutes when the furnace temperature is in the roasting temperature range, preserving the heat for 20-30 minutes, and stopping heating after roasting is finished;
eighth step: and (4) cooling, and taking out the light ceramsite and naturally cooling when the furnace temperature of the roasting equipment is reduced to 150 ℃ after roasting.
Example two:
referring to fig. 2, a method for firing light-weight ceramsite by using waste foundry resin sand includes the following steps:
the first step is as follows: obtaining casting resin waste sand, wherein the cast resin molding sand is still in a high-temperature state, and when a cast and molded workpiece is taken out, the resin molding sand is cooled to normal temperature to obtain the casting resin waste sand;
the second step is that: carrying out primary treatment on the waste casting resin sand, and then crushing and screening the waste casting resin sand;
the third step: retreatment of the waste casting resin sand, magnetic separation treatment of the waste casting resin sand after being screened, and temporary storage of the waste casting resin sand in a sand hopper for later use after the magnetic separation;
the fourth step: adding sludge for mixing, pouring the casting resin waste sand temporarily stored in a sand hopper into a mixer, simultaneously adding dewatered sludge and clay, uniformly stirring the three into mud, uniformly stirring, and simultaneously adding mineral salt with the particle size of 0.2-0.5mm, wherein the mineral salt can increase the whole mineral content of the material, the dewatered sludge is domestic sludge, municipal sludge or industrial sludge and a mixture of the domestic sludge, the municipal sludge or the industrial sludge, the dewatered sludge is subjected to air drying treatment before being added into the mixer, the water content of the dewatered sludge reaches 25-35%, and the mass ratio of the casting resin waste sand to the dewatered sludge to the clay is 2:1: 1;
the fifth step: carrying out extrusion granulation, namely conveying the mixture into an extrusion granulator, outputting a light ceramsite semi-finished product by the extrusion granulator, and ensuring that the water content of the mixture reaches 15% -30% before the extrusion granulation process so that the mixture meets the extrusion requirement of the extrusion granulator, wherein the light ceramsite semi-finished product is ellipsoidal, and the particle size value of the light ceramsite semi-finished product is 5-6 mm;
and a sixth step: drying and preheating, namely conveying the light ceramsite semi-finished product into a dryer for drying treatment, wherein the drying temperature is controlled to be 50-90 ℃, the drying time is controlled to be 1-3 hours, the temperature of the dryer is increased to 150-200 ℃ after the drying process, and the preheating time is 20-30 min;
the seventh step: high-temperature roasting, wherein the dried semi-finished product of the light ceramsite is quickly paved in a roasting tray and is placed in roasting equipment for roasting, the roasting temperature is 1000-1200 ℃, the roasting time is 30-75 minutes, the roasting temperature needs to be sequentially heated and kept, wherein the roasting tray needs to be preheated to be higher than 150 ℃ before being placed in the roasting equipment, the roasting tray needs to be heated after being placed in the roasting equipment, the temperature is heated for 20-30 minutes when the furnace temperature is 150-200 ℃, the temperature is kept for 5-10 minutes when the furnace temperature is 200 ℃, the temperature is heated for 25-35 minutes when the furnace temperature is 200-500 ℃, the temperature is kept for 10-15 minutes when the furnace temperature is 500-200 ℃, the roasting temperature is 1000-1200 ℃, the temperature is heated for 30-50 minutes when the furnace temperature is in the roasting temperature range, preserving the heat for 20-30 minutes, and stopping heating after roasting is finished;
eighth step: and (4) cooling, and taking out the light ceramsite and naturally cooling when the furnace temperature of the roasting equipment is reduced to 150 ℃ after roasting.
Example three:
referring to fig. 3, a method for firing light-weight ceramsite by using waste foundry resin sand includes the following steps:
the first step is as follows: obtaining casting resin waste sand, wherein the cast resin molding sand is still in a high-temperature state, and when a cast and molded workpiece is taken out, the resin molding sand is cooled to normal temperature to obtain the casting resin waste sand;
the second step is that: carrying out primary treatment on the waste casting resin sand, and then crushing and screening the waste casting resin sand;
the third step: retreatment of the waste casting resin sand, magnetic separation treatment of the waste casting resin sand after being screened, and temporary storage of the waste casting resin sand in a sand hopper for later use after the magnetic separation;
the fourth step: adding sludge for mixing, pouring the casting resin waste sand temporarily stored in a sand hopper into a mixer, simultaneously adding dewatered sludge and clay, uniformly stirring the three materials, mixing the mixture into mud, uniformly stirring the mud, and simultaneously adding copper slag, red mud, coal gangue and a mixture of the copper slag, the red mud and the coal gangue, wherein the mass of the added material is less than that of the dewatered sludge, so that the waste utilization rate of the copper slag, the red mud and the coal gangue can be improved, the dewatered sludge is domestic sludge, municipal sludge or industrial sludge and a mixture of the domestic sludge, the municipal sludge or the industrial sludge, the dewatered sludge is added into the mixer and is subjected to air drying treatment, the moisture content of the dewatered sludge reaches 25-35%, and the mass ratio of the casting resin waste sand, the dewatered sludge and the clay is 2: 1;
the fifth step: carrying out extrusion granulation, namely conveying the mixture into an extrusion granulator, outputting a light ceramsite semi-finished product by the extrusion granulator, and ensuring that the water content of the mixture reaches 15% -30% before the extrusion granulation process so that the mixture meets the extrusion requirement of the extrusion granulator, wherein the light ceramsite semi-finished product is ellipsoidal, and the particle size value of the light ceramsite semi-finished product is 5-6 mm;
and a sixth step: drying and preheating, namely conveying the light ceramsite semi-finished product into a dryer for drying treatment, wherein the drying temperature is controlled to be 50-90 ℃, the drying time is controlled to be 1-3 hours, the temperature of the dryer is increased to 150-200 ℃ after the drying process, and the preheating time is 20-30 min;
the seventh step: high-temperature roasting, wherein the dried semi-finished product of the light ceramsite is quickly paved in a roasting tray and is placed in roasting equipment for roasting, the roasting temperature is 1000-1200 ℃, the roasting time is 30-75 minutes, the roasting temperature needs to be sequentially heated and kept, wherein the roasting tray needs to be preheated to be higher than 150 ℃ before being placed in the roasting equipment, the roasting tray needs to be heated after being placed in the roasting equipment, the temperature is heated for 20-30 minutes when the furnace temperature is 150-200 ℃, the temperature is kept for 5-10 minutes when the furnace temperature is 200 ℃, the temperature is heated for 25-35 minutes when the furnace temperature is 200-500 ℃, the temperature is kept for 10-15 minutes when the furnace temperature is 500-200 ℃, the roasting temperature is 1000-1200 ℃, the temperature is heated for 30-50 minutes when the furnace temperature is in the roasting temperature range, preserving the heat for 20-30 minutes, and stopping heating after roasting is finished;
eighth step: and (4) cooling, and taking out the light ceramsite and naturally cooling when the furnace temperature of the roasting equipment is reduced to 150 ℃ after roasting.
Example four:
referring to fig. 4, a method for firing light-weight ceramsite by using waste foundry resin sand includes the following steps:
the first step is as follows: obtaining casting resin waste sand, wherein the cast resin molding sand is still in a high-temperature state, and when a cast and molded workpiece is taken out, the resin molding sand is cooled to normal temperature to obtain the casting resin waste sand;
the second step is that: carrying out primary treatment on the waste casting resin sand, and then crushing and screening the waste casting resin sand;
the third step: retreatment of the waste casting resin sand, magnetic separation treatment of the waste casting resin sand after being screened, and temporary storage of the waste casting resin sand in a sand hopper for later use after the magnetic separation;
the fourth step: adding sludge for mixing, pouring the casting resin waste sand temporarily stored in a sand hopper into a mixer, simultaneously adding dewatered sludge and clay, uniformly stirring the three materials and mixing into mud, and simultaneously adding copper slag, red mud, coal gangue and a mixture of the copper slag, the red mud and the coal gangue, wherein the mass of the added material is less than that of the dewatered sludge, and simultaneously adding mineral salt with the particle size of 0.2-0.5mm, and the mineral salt can increase the whole mineral content of the material, wherein the dewatered sludge is domestic sludge, municipal sludge or industrial sludge and a mixture of the domestic sludge and the industrial sludge, and the dewatered sludge needs to be air-dried before being added into the mixer, the water content of the dewatered sludge reaches 25-35 percent, and the mass ratio of the casting resin waste sand, the dewatered sludge and the clay is 2:1: 1;
the fifth step: carrying out extrusion granulation, namely conveying the mixture into an extrusion granulator, outputting a light ceramsite semi-finished product by the extrusion granulator, and ensuring that the water content of the mixture reaches 15% -30% before the extrusion granulation process so that the mixture meets the extrusion requirement of the extrusion granulator, wherein the light ceramsite semi-finished product is ellipsoidal, and the particle size value of the light ceramsite semi-finished product is 5-6 mm;
and a sixth step: drying and preheating, namely conveying the light ceramsite semi-finished product into a dryer for drying treatment, wherein the drying temperature is controlled to be 50-90 ℃, the drying time is controlled to be 1-3 hours, the temperature of the dryer is increased to 150-200 ℃ after the drying process, and the preheating time is 20-30 min;
the seventh step: high-temperature roasting, wherein the dried semi-finished product of the light ceramsite is quickly paved in a roasting tray and is placed in roasting equipment for roasting, the roasting temperature is 1000-1200 ℃, the roasting time is 30-75 minutes, the roasting temperature needs to be sequentially heated and kept, wherein the roasting tray needs to be preheated to be higher than 150 ℃ before being placed in the roasting equipment, the roasting tray needs to be heated after being placed in the roasting equipment, the temperature is heated for 20-30 minutes when the furnace temperature is 150-200 ℃, the temperature is kept for 5-10 minutes when the furnace temperature is 200 ℃, the temperature is heated for 25-35 minutes when the furnace temperature is 200-500 ℃, the temperature is kept for 10-15 minutes when the furnace temperature is 500-200 ℃, the roasting temperature is 1000-1200 ℃, the temperature is heated for 30-50 minutes when the furnace temperature is in the roasting temperature range, preserving the heat for 20-30 minutes, and stopping heating after roasting is finished;
eighth step: and (4) cooling, and taking out the light ceramsite and naturally cooling when the furnace temperature of the roasting equipment is reduced to 150 ℃ after roasting.
The method for firing the light ceramsite by using the waste casting resin sand comprises the steps of firstly obtaining the waste casting resin sand, primarily treating the waste casting resin sand, secondarily treating the waste casting resin sand, magnetically separating the waste casting resin sand subjected to screening, pouring the waste casting resin sand temporarily stored in a sand hopper into a mixer, simultaneously adding dehydrated sludge and clay, uniformly stirring and mixing the three into mud, extruding and granulating, drying and preheating an extruded light ceramsite semi-finished product, roasting the light ceramsite semi-finished product at a high temperature, and finally cooling. The four embodiments are basically the same in implementation method, and are different in that different materials can be added in the process of stirring and mixing the casting resin waste sand, the dewatered sludge and the clay to form the mud; in the first embodiment, only the casting resin waste sand, the dewatered sludge and the clay are stirred and mixed to form the mud; in the second embodiment, mineral salt is added into the mixture of the waste foundry resin sand, the dewatered sludge and the clay, and the mineral salt can increase the overall mineral content of the material; in the third embodiment, the copper slag, the red mud, the coal gangue and the mixture thereof are added into the mixture of the casting resin waste sand, the dewatered sludge and the clay, so that the waste utilization rate of the copper slag, the red mud and the coal gangue can be improved; in the fourth embodiment, mineral salt, copper slag, red mud, coal gangue and a mixture thereof are added into the mixture of the waste foundry resin sand, the dewatered sludge and the clay, the mineral salt can increase the overall mineral content of the material, and can improve the waste utilization rate of the copper slag, the red mud and the coal gangue, the light ceramsite with different qualities can be obtained by different principle proportions and additions, and meanwhile, the preparation direction is relatively simple and efficient.
In summary, according to the method for firing the light ceramsite by using the waste foundry resin sand, the waste foundry resin sand is obtained, then the waste foundry resin sand is subjected to primary treatment, then the waste foundry resin sand is subjected to secondary treatment, then the screened waste foundry resin sand is subjected to magnetic separation, then the waste foundry resin sand temporarily stored in a sand hopper is poured into a mixer, and simultaneously dehydrated sludge and clay are added, the three are uniformly stirred and mixed into mud, then the mud is extruded and granulated, then the extruded light ceramsite semi-finished product is dried and preheated, then the light ceramsite semi-finished product is subjected to high-temperature roasting, and finally the light ceramsite semi-finished product is cooled. Mineral salt, copper slag, red mud, coal gangue and a mixture of the mineral salt, the copper slag, the red mud and the coal gangue can be added into the mixture of the waste casting resin sand, the dewatered sludge and the clay, wherein the mineral salt can increase the overall mineral content of the materials, and can improve the waste utilization rate of the copper slag, the red mud and the coal gangue.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (7)
1. A method for firing light ceramsite by using waste foundry resin sand is characterized by comprising the following steps:
s1: obtaining casting resin waste sand, wherein the cast resin molding sand is still in a high-temperature state, and when a cast and molded workpiece is taken out, the resin molding sand is cooled to normal temperature to obtain the casting resin waste sand;
s2: carrying out primary treatment on the waste casting resin sand, and then crushing and screening the waste casting resin sand;
s3: retreatment of the waste casting resin sand, magnetic separation treatment of the waste casting resin sand after being screened, and temporary storage of the waste casting resin sand in a sand hopper for later use after the magnetic separation;
s4: adding sludge for mixing, pouring the casting resin waste sand temporarily stored in a sand hopper into a mixer, simultaneously adding the dewatered sludge and the clay, uniformly stirring the three and mixing to obtain mud;
s5: extruding and granulating, namely conveying the mixture into an extruding and granulating machine, and outputting a light ceramsite semi-finished product by the extruding and granulating machine, wherein the light ceramsite semi-finished product is in an ellipsoid shape, and the particle size value of the light ceramsite semi-finished product is 2-7 mm;
s6: drying and preheating, namely conveying the light ceramsite semi-finished product into a dryer for drying treatment, wherein the drying temperature is controlled to be 50-90 ℃, the drying time is controlled to be 1-3 hours, the temperature of the dryer is increased to 150-200 ℃ after the drying process, and the preheating time is 20-30 min;
s7: high-temperature roasting, wherein the dried semi-finished product of the light ceramsite is quickly paved in a roasting tray and placed in roasting equipment for roasting, the roasting temperature is 1000-1200 ℃, and the roasting time is 30-75 minutes;
s8: and (4) cooling, and taking out the light ceramsite and naturally cooling when the furnace temperature of the roasting equipment is reduced to 150 ℃ after roasting.
2. The method for firing the light-weight ceramsite by using the casting resin waste sand as claimed in claim 1, wherein the dewatered sludge is domestic sludge, municipal sludge or industrial sludge and a mixture thereof, the dewatered sludge is subjected to air drying treatment before being added into a mixer, the water content of the dewatered sludge reaches 25% -35%, and the mass ratio of the casting resin waste sand to the dewatered sludge to the clay is 2:1: 1.
3. The method for firing light-weight ceramsite by using waste foundry resin sand as recited in claim 1, wherein mineral salts with particle size of 0.2-0.5mm are added while stirring uniformly in S4.
4. The method for firing the light ceramsite by using the waste foundry resin sand as recited in claim 1, wherein the semi-finished product of the light ceramsite in S5 has a particle size of 5-6 mm.
5. The method for firing light-weight ceramsite by using waste foundry resin sand as recited in claim 1, wherein the firing temperature in S7 is required to be sequentially increased and maintained:
wherein the roasting plate is arranged in the roasting equipment and needs to be preheated to more than 150 ℃;
when the roasting plate is placed in roasting equipment, the temperature needs to be raised;
when the furnace temperature is between 150 ℃ and 200 ℃, the temperature is raised for 20 to 30 minutes;
when the furnace temperature is 200 ℃, preserving the heat for 5-10 minutes;
when the furnace temperature is within the range of 200-500 ℃, the temperature is raised for 25-35 minutes;
when the furnace temperature is 500 ℃, preserving the heat for 10-15 minutes;
when the furnace temperature is in the range of 500-sintering temperature, the sintering temperature is 1000-1200 ℃, and the temperature is raised for 30-50 minutes;
when the furnace temperature is in the sintering temperature range, preserving the heat for 20-30 minutes, and stopping heating after the sintering is finished.
6. The method for firing the light-weight ceramsite by using the casting resin waste sand as claimed in claim 1, wherein the copper slag, the red mud, the coal gangue and the mixture thereof can be added while the S4 is uniformly stirred, and the mass of the added materials is less than that of the dehydrated sludge.
7. The method for firing the light ceramsite by using the waste foundry resin sand as the claim 1 is characterized in that the water content of the mixed material is ensured to reach 15% -30% before the extrusion granulation process, so that the mixed material meets the extrusion requirement of an extrusion granulator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113072360A (en) * | 2021-04-13 | 2021-07-06 | 杭州奥兴筑友科技有限公司 | Light ceramsite sand and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113072360A (en) * | 2021-04-13 | 2021-07-06 | 杭州奥兴筑友科技有限公司 | Light ceramsite sand and preparation method thereof |
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