Method for separating high purity concrete from a concrete mixture

Abstract

The present application relates to the field of construction waste purification, particularly to a method for separating high-purity bricks and concrete from brick-concrete mixture, comprising the following steps: step one, the brick-concrete mixture is divided into mixture A, mixture B and mixture C; step two, mixture A is screened and purified by using a first color sorter, mixture C is screened and purified by using a second color sorter, and mixture B is further screened by using a specific gravity sieve; step three, mixture B is screened into light substance, heavy substance and undersize, the light substance is transported to the first color sorter, and the heavy substance is transported to the second color sorter; step four, mixture A and the light substance are color-selected and screened by using the first color sorter, and mixture C and the heavy substance are screened by using the second color sorter. The present application separates bricks and concrete with high purity by screening the brick-concrete mixture with similar proportions of bricks and concrete and then respectively feeding them into color sorters for color selection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of construction waste purification, in particular to a method for separating high-purity bricks and concrete from brick-concrete mixture. BACKGROUND

[0002] Recycling of construction waste and decoration waste can effectively reduce the development of mineral resources, promote the recycling of waste resources and sustainable development. In the traditional construction waste treatment process, single color sorter is often used for the separation of brick-concrete mixture. The working principle of the color sorter is to identify and distinguish different colors of brick-concrete raw materials, and then blow off the material with lower content of the two different colors by high-pressure air blowing, so as to separate bricks and concrete.

[0003] The working principle of the above color sorter determines that when the proportion of brick-concrete mixture is close, longer working time and higher energy consumption are required, and the purity after separation is low. Therefore, the recycled product of traditional brick-concrete mixture often has high impurity content, which limits the application range of recycled aggregate and brick recycled material, and can only be used as a road base, greatly reducing the utilization rate and utilization value of recycled aggregate and brick recycled material. SUMMARY

[0004] The main purpose of the present application is to overcome the shortcomings of the prior art, and provide a method for separating high-purity bricks and concrete from brick-concrete mixture by screening the brick-concrete mixture with similar proportions of bricks and concrete and then feeding them into color sorters for color selection.

[0005] The present application adopts the following technical solutions:

[0006] A method for separating high-purity bricks and concrete from brick-concrete mixture, characterized by comprising the following steps:

[0007] Step one, the brick-concrete mixture is divided into mixture A with high brick content, mixture B with similar brick-concrete content and mixture C with high concrete content after crushing and sorting according to the initial proportion of bricks and concrete, and the mixture A, mixture B and mixture C are screened and purified in three ways;

[0008] Step two, the first color sorter is used to screen and purify the mixture A, the second color sorter is used to screen and purify the mixture C, and the specific gravity screen is used to further screen the mixture B;

[0009] Step three, the specific gravity screen screens the mixture B into light material with high brick content, heavy material with high concrete content and undersize material, and the light material is transported to the first color sorter and the heavy material is transported to the second color sorter through different discharge ends;

[0010] Step four, the first color sorter carries out color selection and screening on the mixed material A with high brick content and light substance, to obtain a small amount of pure concrete and a large amount of pure brick, and the second color sorter carries out screening on the mixed material C with high concrete content and heavy substance, to obtain a large amount of pure concrete and a small amount of pure brick;

[0011] Step five, repeat steps one to four until the screening of all brick-concrete mixed materials is completed.

[0012] Further, the first magnetic separator is further included, and the mixed material A in step two is first passed through the first magnetic separator to remove magnetic impurities before being fed into the first color sorter.

[0013] Further, the second magnetic separator is further included, and the mixed material B in step two is first passed through the second magnetic separator to remove magnetic impurities before being fed into the specific gravity sieve.

[0014] Further, the third magnetic separator is further included, and the mixed material C in step two is first passed through the third magnetic separator to remove magnetic impurities before being fed into the second color sorter.

[0015] Further, the particle size of the mixed material A, the mixed material B and the mixed material C obtained after the brick-concrete mixed material is crushed and sorted in step one is less than 40 mm.

[0016] Further, the undersize material screened out in step three is fine sand with a particle size of less than 5 mm.

[0017] As can be seen from the above description of the present application, compared with the prior art, the beneficial effects of the present application are as follows: first, the brick-concrete mixed material is first screened into mixed material A, mixed material B and mixed material C according to the initial proportion of brick-concrete, and then the mixed material A, the mixed material B and the mixed material C are color-selected and separated by the first color sorter and the second color sorter, to obtain high-purity brick and high-purity concrete, which can effectively improve the purity of the recycled aggregate and the brick regenerative material, thereby improving the recycling value of the brick-concrete mixed material; the mixed material A, the mixed material B and the mixed material C are magnetically separated by the first magnetic separator, the second magnetic separator and the third magnetic separator, to remove the magnetic impurities in the brick-concrete mixed material, thereby further improving the separation purity. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is part of the structure of the specific embodiment of the present application.

[0019] In the figure: 1. first feeding channel, 2. second feeding channel, 3. third feeding channel, 4. specific gravity sieve, 5. first color sorter, 6. second color sorter, 7. first magnetic separator, 8. second magnetic separator, 9. third magnetic separator. DETAILED DESCRIPTION

[0020] The present application will be further described below through specific embodiments.

[0021] Referring to Figure 1 The application provides a device for separating high-purity bricks and concrete from brick-concrete mixture, which comprises a first feeding channel 1, a second feeding channel 2, a third feeding channel 3, a screening mechanism, a first color sorter 5, a second color sorter 6, a waste tank, a first magnetic separator 7, a second magnetic separator 8 and a third magnetic separator 9. The screening mechanism is a specific gravity screen 4. The first feeding channel 1 is connected with the feeding port of the first color sorter 5. The second feeding channel 2 is connected with the feeding port of the specific gravity screen 4. The third feeding channel 3 is connected with the feeding port of the second color sorter 6. The specific gravity screen 4 has three discharge ports. One of the discharge ports of the specific gravity screen 4 is connected with the feeding port of the first color sorter 5. One of the discharge ports of the specific gravity screen 4 is connected with the feeding port of the second color sorter 6. The last discharge port of the specific gravity screen 4 is connected with the waste tank.

[0022] The first magnetic separator 7 is arranged in the conveying direction of the first feeding channel 1, and the first magnetic separator 7 is located in front of the first color sorter 5. The second magnetic separator 8 is arranged in the conveying direction of the second feeding channel 2, and the second magnetic separator 8 is located in front of the specific gravity screen 4. The third magnetic separator 9 is arranged in the conveying direction of the third feeding channel 3, and the third magnetic separator 9 is located in front of the second color sorter 6.

[0023] Continuing to refer to Figure 1 A method for separating high-purity bricks and concrete from brick-concrete mixture, which comprises the following steps:

[0024] Step one: according to the initial proportion of bricks and concrete, the brick-concrete mixture is crushed and sorted by a traditional process, so that the brick-concrete mixture is crushed and screened into mixture A with a particle size of less than 40 mm and a high brick content, mixture B with a particle size of less than 40 mm and a close brick-concrete content and mixture C with a particle size of less than 40 mm and a high concrete content. The particle size of the mixture A, the mixture B and the mixture C is not limited to less than 40 mm, and can be other particle sizes according to actual application and the difference of the front-end process route.

[0025] Step two: the first feeding channel 1 conveys the mixture A, the mixture A is conveyed into the first color sorter 5 after removing magnetic impurities by the first magnetic separator 7, the second feeding channel 2 conveys the mixture B, the mixture B is put into the specific gravity screen 4 after removing magnetic impurities by the second magnetic separator 8, the third feeding channel conveys the mixture C, and the mixture C is put into the second color sorter 6 after removing magnetic impurities by the third magnetic separator 9.

[0026] Step three, the mixed material B is screened by the specific gravity screen 4, the mixed material B is screened into light material with high brick content, heavy material with high concrete content and undersize material, the undersize material is fine sand with particle size less than 5mm, but the particle size of the undersize material is not limited to less than 5mm, the light material is transported to the first color sorter 5 through different discharge ports, the heavy material is transported to the second color sorter 6, and the undersize material is transported to the waste tank;

[0027] Step four, the first color sorter 5 performs color selection and screening on the mixed material A with high brick content and the light material, to obtain a small amount of pure concrete and a large amount of pure bricks, and the second color sorter 6 performs screening on the mixed material C with high concrete content and the heavy material, to obtain a large amount of pure concrete and a small amount of pure bricks; the pure concrete can be used as recycled fine aggregate, the pure bricks can be used as brick recycling material, and the undersize material can be used to produce brick recycling material or directly filled and buried.

[0028] Step five, steps one to four are repeated until the screening of all brick-concrete mixed materials is completed.

[0029] The application designs a separation method of high-purity bricks and concrete in brick-concrete mixed materials, which can meet the needs of efficient, high yield and high purity of the separation of brick-concrete mixed materials, and finally obtains recycled fine aggregate, brick recycling material and fine sand; the recycled fine aggregate can be used for high-strength concrete production, the brick recycling material and the fine sand can be used for producing recycled garden bricks and for road cushion and the like; the separation method of high-purity bricks and concrete in brick-concrete mixed materials is simple and reasonable in design, high in energy utilization rate, promotes resource recycling, and the purity of the separated bricks and concrete is high.

[0030] The above is only one specific embodiment of the application, but the design concept of the application is not limited thereto, and any non-substantial modification of the application using the concept shall be regarded as an act of infringing the protection scope of the application.

Claims

1. A method for separating high-purity brick concrete from a brick-concrete mixture, characterized by: The steps include: Step 1: The brick-concrete mixture is crushed and sorted according to the initial proportion of brick and concrete into a mixture A with a higher brick content, a mixture B with a similar brick-concrete content, and a mixture C with a higher concrete content. The mixtures A, B, and C are screened and purified in three ways; Step 2: Use the first color sorter to screen and purify the mixture A, use the second color sorter to screen and purify the mixture C, and use the specific gravity screen to further screen the mixture B; Step 3: Use a specific gravity screen to screen the mixture B into light materials with a higher brick content, heavy materials with a higher concrete content, and undersize materials. The light materials are then transported to the first color sorter through different discharge ends, and the heavy materials are transported to the second color sorter. Step 4: The first color sorter performs color sorting and screening on the mixture A with a higher brick content and the light matter to obtain a small amount of pure concrete and a large amount of pure bricks. The second color sorter performs color sorting and screening on the mixture C with a higher concrete content and the heavy matter to obtain a large amount of pure concrete and a small amount of pure bricks. Step 5: Repeat steps 1 to 4 until all brick-concrete mixtures are screened.

2. The method for separating high-purity brick concrete from a brick-concrete mixture according to claim 1, characterized in that: It also includes a first magnetic separator. In the step 2, the mixed material A is first passed through the first magnetic separator to remove magnetic impurities before being put into the first color sorter.

3. The method for separating high-purity brick concrete from a brick-concrete mixture according to claim 1, wherein: It also includes a second magnetic separator. In the step 2, the mixed material B is first passed through the second magnetic separator to remove magnetic impurities before being put into the specific gravity screen.

4. The method for separating high-purity brick concrete from a brick-concrete mixture according to claim 1, characterized in that: It also includes a third magnetic separator. In the step 2, the mixed material C is first passed through the third magnetic separator to remove magnetic impurities before being fed into the second color sorter.

5. The method for separating high-purity brick concrete from a brick-concrete mixture according to claim 1, characterized in that: In the step 1, the particle sizes of the mixtures A, B and C obtained after the brick-concrete mixture is crushed and sorted are less than 40 mm.

6. The method for separating high-purity brick concrete from a brick-concrete mixture according to claim 1, characterized in that: The undersize material sieved out in the step 3 is fine sand with a size of less than 5 mm.

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