Construction waste foamed concrete screening method and screening equipment

Abstract

The present invention belongs to the technical field of construction waste classification and treatment, and relates to a method and device for screening foamed concrete in construction waste. The method and device for screening foamed concrete in construction waste are improvements on the traditional construction waste recycling method. The wood, plastic blocks, foamed concrete, etc. in the recycled aggregate of construction waste are first separated as light materials, and the foamed concrete in the output light materials is further removed to obtain combustible light material fuel. The light material after the foamed concrete is removed can be used for incineration power generation and other purposes, thereby improving the incineration efficiency of combustible light materials. The method and device for screening foamed concrete in construction waste have the advantages of reasonable design, high utilization rate of recycled raw materials, and high purity of output, which improves the value of recycled aggregate of construction waste and realizes the maximum utilization of resources.

Description

Technical Field

[0001] The invention belongs to the technical field of construction waste classification and treatment, and relates to a method and equipment for screening foamed concrete in construction waste. Background Art

[0002] With the continuous acceleration of urbanization and engineering construction in my country, a large amount of construction waste and decoration waste has appeared. These wastes have caused certain pollution to the environment. If they are not well utilized as resources, they will also cause waste of resources. In order to achieve the goals of carbon peak and carbon neutrality, the reuse of construction waste and decoration waste can effectively reduce the development of mineral resources and promote the recycling and sustainable development of waste resources.

[0003] In the traditional construction waste recycling process, house demolition waste and decoration waste are important components of construction waste. Construction waste mainly includes metals, bricks and tiles, concrete, foamed concrete, plastics, wood, etc. generated during the demolition process.

[0004] The existing classification of construction waste is mainly based on the weight of the waste. Materials with high specific gravity, such as metals, bricks and tiles, and concrete, can be used for aggregate resource utilization and used to make recycled bricks or road bases. Light materials such as plastics and wood with low specific gravity are often made into combustible fuels for incineration to generate electricity or for other purposes. However, the specific gravity of foamed concrete in construction waste is relatively light, and it will be mixed with the light materials after sorting during classification. Due to the poor flammability of foamed concrete, the mixing of foamed concrete greatly reduces the utilization efficiency and reuse value of light material recycled materials. In view of this, the problem of the difficulty in classifying foamed concrete in construction waste needs to be solved urgently. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a method and a device for screening foamed concrete from construction waste.

[0006] To achieve the above purpose, the method for screening foamed concrete in construction waste has the following specific steps:

[0007] Step 1: The construction waste is crushed into uniform construction waste aggregates;

[0008] Step 2: Screening the construction waste aggregates according to specific gravity to separate the construction waste aggregates into three types of materials: heavy matter, undersize matter and light matter;

[0009] Step 3, the obtained light material is subjected to extrusion treatment, and the foamed concrete in the light material is crushed into particles or powder;

[0010] Step 4: Screen the light matter after extrusion and crushing according to the particle size, the screened material is the combustible light matter after the foamed concrete is screened out, and the screened material is the granular material or powder containing the foamed concrete.

[0011] Furthermore, in step 1, the particle size of the construction waste aggregate is less than 80 mm.

[0012] Furthermore, in step 1, after the magnetic material is removed from the construction waste recycled aggregate by magnetic separation, the construction waste recycled aggregate is screened according to specific gravity.

[0013] Furthermore, the heavy materials in step 2 are subjected to secondary magnetic separation to obtain pure recycled aggregate, and the screened materials are separated into fine sand and linear impurities after screening.

[0014] Furthermore, in step three, a double-roll crushing device is used to extrude and crush the light material, and the foamed concrete in the light material is crushed into particles or powder by extrusion, while the remaining light material is deformed or cracked by extrusion but not crushed into particles or powder.

[0015] Furthermore, the particle size of the particles or powders crushed in step three is less than 10 mm.

[0016] The device for screening foamed concrete in construction waste comprises a crushing device, a specific gravity screening device, an extrusion crushing device and a screen screening device, wherein the crushing device is provided with an aggregate outlet, the specific gravity screening device is connected with the aggregate outlet of the crushing device, the specific gravity screening device is provided with a heavy material discharge port, a screened material discharge port and a light material discharge port, the extrusion crushing device is connected with the light material outlet, the extrusion crushing device is provided with a material outlet, and the screen screening device is connected with the material outlet of the extrusion crushing device.

[0017] Furthermore, it also includes a magnetic separation device, which is arranged between the crushing device and the specific gravity screening device. The aggregate discharged from the crushing device is first magnetically separated by the magnetic separation device and then enters the specific gravity screening device.

[0018] Furthermore, the extrusion crushing device is a double-roll crushing device.

[0019] Furthermore, the screen screening device is a relaxation screen.

[0020] From the above description of the present invention, it can be seen that compared with the prior art, the method and equipment for screening foamed concrete from construction waste is an improvement on the traditional method for recycling construction waste, by first distinguishing the wood, plastic blocks, foamed concrete, etc. in the recycled aggregate of construction waste as light materials, and further removing the foamed concrete from the output light materials, to obtain combustible light material fuel. The light materials after the foamed concrete is removed can be used for incineration power generation and other purposes, thereby improving the incineration efficiency of combustible light materials. The method and equipment for screening foamed concrete from construction waste have the advantages of reasonable design, high utilization rate of recycled raw materials, and high purity of output, which improves the value of recycled aggregates of construction waste and realizes the maximum utilization of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a flow chart of the method for screening foamed concrete from construction waste.

[0022] Figure 2 This is a schematic diagram of the structure of the equipment for screening foamed concrete from construction waste. DETAILED DESCRIPTION

[0023] The present invention is further described below through specific implementation modes.

[0024] Reference Figure 1 , 2 The method for screening out foamed concrete from construction waste shown in the figure has the following specific steps:

[0025] Step 1: The construction waste is crushed into uniform construction waste aggregate. The construction waste recycled aggregate is obtained by crushing and screening the construction waste in the traditional process. The crushing process is determined according to the type of construction waste. The particle size of the construction waste aggregate after crushing is less than 80mm;

[0026] The crushed construction waste aggregates can be subjected to a magnetic separation first to prevent the steel bars and other metal materials in the construction waste aggregates from damaging the specific gravity screen, and the metal waste can also be collected and utilized;

[0027] Step 2: Screening the construction waste aggregates according to their specific gravity, and separating the construction waste into three types of materials: heavy matter, undersize and light matter. The heavy matter is subjected to secondary magnetic separation to obtain pure recycled aggregates, and the undersize is separated and processed to obtain fine sand and linear impurities.

[0028] Step 3, the obtained light material is subjected to extrusion treatment, and a double-roll crushing device is used to perform extrusion crushing treatment on the light material, and the foamed concrete in the light material is crushed into particles and powder by extrusion, and the particle size of the crushed particles or powder is less than 10 mm. The actual particle size of the powder is set according to the process requirements, and the remaining light materials such as wood, plastic, and textiles are deformed or cracked by extrusion and are not crushed into particles and powder;

[0029] Step 4: The light materials after extrusion and crushing are screened according to the particle size. The materials on the screen are the combustible light materials of the foamed concrete, and the materials under the screen are the particles or powders such as the broken slag and slag soil containing the foamed concrete.

[0030] according to Figure 1 , 2 As shown, a device for screening foamed concrete in construction waste includes a crushing device 1, a first magnetic separation device 2, a specific gravity screening device 3, an extrusion crushing device 4, and a screen screening device 5;

[0031] The crushing device 1 is provided with an aggregate outlet 11, and the aggregate outlet 11 of the crushing device 1 is connected via a belt conveyor 12. The magnetic separation device 2 is arranged on the belt conveyor to magnetically separate the construction waste aggregate before entering the specific gravity screening device 3.

[0032] One end of the belt conveyor 12 is connected to the aggregate outlet 11 of the crushing device 1, and the other end is connected to the feed port 31 of the specific gravity screening device 3 through the vibrating feeder 13. The specific gravity screening device 3 is provided with a heavy material discharge port 32, a screened material discharge port 33 and a light material discharge port 34;

[0033] The extrusion crushing device 4 is a double-roll crushing device, which is connected to the light material outlet 34 through the belt conveyor 14. The extrusion crushing device 4 performs extrusion crushing on the light material, and crushes the foamed concrete in the light material into particles and powder by extrusion. The extrusion crushing device is provided with a material outlet 41, and all the extruded and crushed materials are discharged from the material outlet 41.

[0034] The mesh screening device 5 is a relaxation screen, which is connected to the material outlet of the extrusion crushing device and is used to screen the light materials fed in, and to remove the crushed foamed concrete residue and slag as undersize materials, while retaining the combustible light material fuel that is deformed or cracked after extrusion but not crushed into particles or powder.

[0035] The method and equipment for screening foamed concrete in construction waste of the present invention are improvements on the traditional method for recycling construction waste. Light materials such as wood, plastic blocks, foamed concrete, etc. are distinguished from the recycled aggregates of construction waste, and the foamed concrete in the output light materials is further removed to obtain combustible light material fuel for incineration power generation and other purposes, thereby improving the incineration efficiency of combustible light materials. The method and equipment for screening foamed concrete in construction waste have the advantages of reasonable design, high utilization rate of recycled raw materials, and high purity of output, which improves the value of recycled aggregates of construction waste and realizes the maximum utilization of resources.

[0036] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A method for screening foamed concrete from construction waste, characterized in that: a device for screening foamed concrete from construction waste is used, wherein the device comprises a crushing device, a specific gravity screening device, an extrusion crushing device, and a screen screening device, wherein the crushing device is provided with an aggregate outlet, the specific gravity screening device is connected to the aggregate outlet of the crushing device, the specific gravity screening device is provided with a heavy material discharge port, a screen under discharge port, and a light material discharge port, the extrusion crushing device is connected to the light material outlet, the extrusion crushing device is provided with a material outlet, the screen screening device is connected to the material outlet of the extrusion crushing device, and further comprises a magnetic separation device, wherein the magnetic separation device is arranged between the crushing device and the specific gravity screening device, and the aggregate discharged from the crushing device is first magnetically separated by the magnetic separation device and then enters the specific gravity screening device, and the specific steps are as follows: Step 1: The construction waste is crushed into uniform construction waste aggregate, the particle size of the construction waste aggregate is less than 80 mm, and the construction waste recycled aggregate is screened according to the specific gravity after the magnetic material is removed by magnetic separation; Step 2: Sieve the construction waste aggregate according to specific gravity to separate the construction waste aggregate into three types of materials: heavy matter, undersize and light matter. The heavy matter is subjected to secondary magnetic separation to obtain pure recycled aggregate, and the undersize is separated into fine sand and linear impurities after screening. Step 3, the obtained light material is subjected to extrusion treatment, and the foamed concrete in the light material is crushed into particles or powders, and the light material is subjected to extrusion and crushing treatment using a double-roll crushing device, and the foamed concrete in the light material is crushed into particles or powders by extrusion, and the remaining light material is deformed or cracked by extrusion but not crushed into particles or powders, and the particle size of the crushed particles or powders is less than 10 mm; Step 4: Screen the light matter after extrusion and crushing according to the particle size, the screened material is the combustible light matter after the foamed concrete is screened out, and the screened material is the granular material or powder containing the foamed concrete.

2. The method for screening foamed concrete from construction waste according to claim 1, characterized in that :The extrusion crushing device is a double-roll crushing device.

3. The method for removing foamed concrete from construction waste according to claim 1, characterized in that :The screen screening device is a relaxation screen.

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