Machine-made sand processing device and process

Abstract

The invention discloses a machining process of machine-made sand. Stone chips are fed into a high-frequency vibrating screen to be pre-graded; the screened materials comprise a first material and a second material; feeding the first material into a first surge bin; feeding the second material into a second surge bin, and crushing the second material through a crusher; the materials crushed by the crusher are fed into a high-frequency vibrating screen to be graded, and undersize materials and oversize materials are obtained; feeding the undersize material into a first surge bin; part of oversize materials are returned to the crusher through the belt conveyor; part of the oversize materials are fed into a third buffering bin; feeding the materials in the first surge bin into a powder concentrator, removing stone powder, and feeding the materials into a third surge bin; grading the materials in the third surge bin, feeding the materials into a stirrer for humidifying and stirring, and then feeding the materials into a finished product warehouse to obtain qualified machine-made sand. Through grading, shaping and grading, the particle regularity and the product value are improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of non-metallic mineral processing, and in particular to a processing device and process for machine-made sand. Background Art

[0002] Artificial sand is sand made from processed stone. Currently, sand making is basically the co-production of artificial sand (-5mm stone chips) in aggregate processing. However, the sand produced by aggregate production usually has a fineness modulus of about 3.2, a particle distribution usually in Zone 1, and a high content of flaky particles and stone powder (-0.075mm), which cannot meet the requirements of artificial sand.

[0003] Usually, the output of stone chips accounts for 30-38%. In order to improve the utilization rate of mineral resources and product value, a reasonable process is needed to process the stone chips into qualified products.

[0004] Therefore, the present invention provides a machine-made sand processing device and process, which processes the stone chips formed by aggregate production into qualified machine-made sand products through classification, shaping and grading, which obviously has important research significance. Summary of the invention

[0005] The invention aims to provide a processing technology for machine-made sand, which can improve particle regularity and product value and reduce production costs through classification, shaping and grading.

[0006] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the present invention is: a processing technology of machine-made sand, comprising the following steps:

[0007] S1, sending the stone chips into a high-frequency vibrating screen for pre-classification; the screened materials include a first material and a second material;

[0008] S2, sending the first material obtained after screening in step S1 into the first buffer bin; sending the second material obtained after screening in step S1 into the second buffer bin and crushing it by a crusher;

[0009] S3, sending the material crushed by the crusher in step S2 to a high-frequency vibrating screen for classification, and obtaining the undersize material and the oversize material;

[0010] S4, sending the undersize material obtained in step S3 to the first buffer bin; returning part of the oversize material obtained in step S3 to the crusher through a belt conveyor; sending part of the oversize material obtained in step S3 to the third buffer bin;

[0011] S5, sending the material in the first buffer bin to the powder selector, and after removing the stone powder, sending it to the third buffer bin;

[0012] S6. Grade the materials in the third buffer bin, send them into a mixer for humidification and mixing, and then send them into a finished product warehouse to obtain qualified machine-made sand.

[0013] Preferably, the stone chips in step S1 are -5 mm stones produced by aggregate processing, that is, stones with a particle size of 0 to 5 mm.

[0014] Preferably, the first material is a -2.36 mm material, that is, a material with a particle size of 0 mm to 2.36 mm; and the second material is a +2.36 mm material, that is, a material with a particle size of 2.36 mm to 5 mm.

[0015] Preferably, in step S2, the crusher is a vertical shaft impact crusher.

[0016] Preferably, in step S3, the aperture of the high-frequency vibration screen is 2.36 mm.

[0017] Preferably, in step S4, 50% to 100% of the oversize material obtained in step S3 is returned to the crusher via a belt conveyor; and 0% to 50% of the oversize material obtained in step S3 is sent to a third buffer bin.

[0018] Preferably, in step S4, the removed stone powder is -0.074 mm stone powder, that is, the particle size is 0 to 0.074 mm.

[0019] Preferably, the number of the high-frequency vibrating screens is 5, namely, the first high-frequency vibrating screen, the second high-frequency vibrating screen, the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen; in step S1, the stone chips are fed into the first high-frequency vibrating screen and the second high-frequency vibrating screen for pre-classification; in step S3, the material crushed by the crusher in step S2 is fed into the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen for classification.

[0020] The present application also claims protection for a machine-made sand processing device for carrying out the machine-made sand processing process described above; comprising an elevator, a sand-making building, a crusher, a buffer bin, a powder classifier and a finished product warehouse, wherein the elevator is used to transport stone chips to the sand-making building; a high-frequency vibrating screen is provided on the top of the sand-making building, wherein the high-frequency vibrating screen is used to classify materials, and the powder classifier is used to remove impurities.

[0021] Preferably, a belt conveyor is provided between the crusher and the high-frequency vibrating screen.

[0022] In the above, the vertical shaft impact crusher uses the stone to rush into the crushing chamber at high speed under the action of centrifugal force, violently collide with the suspended stone and material liner, move upward along the stone accumulation slope to the top, then deflect and move downward, and collide again with the stone thrown out of the rotor. The stone that loses kinetic energy is discharged from the crushing chamber. In this process, the stones impact and grind each other to achieve the effect of crushing and shaping.

[0023] Furthermore, the -2.36mm material can be pre-separated through screening to reduce the amount of stone powder formed during the crushing process; at the same time, by controlling the amount of +2.36 material returned for crushing and mixed with -2.36mm material, the grading of the machine-made sand can be effectively adjusted to meet the requirements of Zone 2.

[0024] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0025] (1) The present invention can efficiently crush and reshape stone chips through the vertical shaft impact crushing method, reduce the content of flaky particles, and improve the regularity of particles.

[0026] (2) The present invention flexibly adjusts the ratio of +2.36 mm and -2.36 mm materials by controlling the diversion of +2.36 mm materials, effectively controls the grading interval of machine-made sand so that it is located in zone 2, and improves the product value.

[0027] (3) The present invention adopts a pre-classification method, which reduces the output of stone powder in the crushing stage by about 5%, thereby improving the output rate of the product and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, some of the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a process flow chart of the machine-made sand in Example 1;

[0030] Figure 2 This is a schematic diagram of the structure of the machine-made sand processing device in Example 1.

[0031] Among them, 1. high-frequency vibrating screen; 2. first buffer bin; 3. crusher; 4. belt conveyor; 5. third buffer bin; 6. powder classifier; 7. mixer; 11. first high-frequency vibrating screen; 12. second high-frequency vibrating screen; 13. third high-frequency vibrating screen; 14. fourth high-frequency vibrating screen; 15. fifth high-frequency vibrating screen. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment provides a process for processing machine-made sand, and the process for processing machine-made sand includes the following steps:

[0035] S1, sending the stone chips into the high-frequency vibrating screen 1 for pre-classification; the screened materials include the first material and the second material;

[0036] S2, sending the first material obtained after screening in step S1 into the first buffer bin 2; sending the second material obtained after screening in step S1 into the second buffer bin, and crushing it by the crusher 3;

[0037] S3, sending the material crushed by the crusher in step S2 to a high-frequency vibrating screen for classification, and obtaining the undersize material and the oversize material;

[0038] S4, sending the undersize material obtained in step S3 to the first buffer bin; returning part of the oversize material obtained in step S3 to the crusher through the belt conveyor 4; sending part of the oversize material obtained in step S3 to the third buffer bin 5;

[0039] S5, sending the material in the first buffer bin to the powder selector 6, and after removing the stone powder, sending it to the third buffer bin;

[0040] S6. The material in the third buffer bin is graded, sent to the mixer 7 for humidification and mixing, and then sent to the finished product warehouse to obtain qualified machine-made sand.

[0041] Furthermore, the stone chips in step S1 are -5 mm stones produced by aggregate processing, that is, stones with a particle size of 0 to 5 mm.

[0042] Furthermore, the first material is a -2.36mm material, that is, a material with a particle size of 0mm to 2.36mm; the second material is a +2.36mm material, that is, a material with a particle size of 2.36mm to 5mm.

[0043] Furthermore, in step S2, the crusher is a vertical shaft impact crusher.

[0044] Furthermore, in step S3, the aperture of the high-frequency vibration screen is 2.36 mm.

[0045] Furthermore, in step S4, 50% to 100% of the oversize material obtained in step S3 is returned to the crusher via a belt conveyor; and 0% to 50% of the oversize material obtained in step S3 is sent to a third buffer bin.

[0046] Furthermore, in step S4, the removed stone powder is -0.074 mm stone powder, that is, the particle size is 0 to 0.074 mm.

[0047] like Figure 2 As shown, the present application also provides a machine-made sand processing device for carrying out the machine-made sand processing process described above; it includes an elevator 1, a sand-making building, a crusher 3, a buffer bin 4, a powder classifier 5 and a finished product warehouse, the elevator is used to transport stone chips to the sand-making building; a high-frequency vibrating screen is provided on the top of the sand-making building, the high-frequency vibrating screen is used to classify materials, and the powder classifier is used to remove impurities.

[0048] Furthermore, a belt conveyor is provided between the crusher and the high-frequency vibrating screen.

[0049] Furthermore, the number of high-frequency vibrating screens is 5, namely, a first high-frequency vibrating screen 11, a second high-frequency vibrating screen 12, a third high-frequency vibrating screen 13, a fourth high-frequency vibrating screen 14, and a fifth high-frequency vibrating screen 15; in step S1, the stone chips are fed into the first high-frequency vibrating screen and the second high-frequency vibrating screen for pre-classification; in step S3, the material crushed by the crusher in step S2 is fed into the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen for classification.

[0050] Example 2

[0051] This embodiment takes a certain machine-made sand project in Henan Province as an example, and provides a processing technology for machine-made sand, which solves the problems of irregular particles, large particle grading, and high stone powder output in the current machine-made sand production through classification, shaping and grading. Specifically, the specific method of this embodiment includes the following steps:

[0052] S1. The -5 mm stones produced by aggregate processing are lifted by the elevator to the first high-frequency vibrating screen and the second high-frequency vibrating screen on the top of the sand making building for pre-classification;

[0053] S2, sending the -2.36mm material after screening in step S1 into the first buffer bin; after the +2.36mm material is discharged into the second buffer bin through the chute, it is sent to the vertical shaft impact crusher through the belt scale for crushing;

[0054] S3, in step S2, after the +2.36 mm material is crushed, it is lifted by the hoist to the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen on the top of the sand making building for classification;

[0055] S4. In step S3, the -2.36 mm material is screened and sent to the first buffer bin; the material in the first buffer bin is then sent to the powder selector, and after the stone powder is removed, it is sent to the third buffer bin;

[0056] S5. In step S3, 60% of the materials with a size of +2.36 mm on the screen are returned to the crusher through the belt conveyor, and 40% are sent to the third buffer bin for grading.

[0057] S6. The graded materials in the third buffer bin are sent to the mixer for humidification and mixing, and then sent to the finished product warehouse to obtain qualified machine-made sand.

[0058] According to the standard GB / T 14684-2011 "Sand for Construction", the indexes of the machine-made sand prepared in Example 2 were tested, and the results are shown in Table 1.

[0059] Table 1

[0060]

[0061] Example 3

[0062] This embodiment takes a certain machine-made sand project in Shaanxi Province as an example, and provides a processing technology for machine-made sand. The specific method of this embodiment includes the following steps:

[0063] S1. The -5 mm stones produced by aggregate processing are lifted by the elevator to the first high-frequency vibrating screen and the second high-frequency vibrating screen on the top of the sand making building for pre-classification;

[0064] S2, sending the -2.36mm material after screening in step S1 into the first buffer bin; after the +2.36mm material is discharged into the second buffer bin through the chute, it is sent to the vertical shaft impact crusher through the belt scale for crushing;

[0065] S3, in step S2, after the +2.36 mm material is crushed, it is lifted by the hoist to the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen on the top of the sand making building for classification;

[0066] S4. In step S3, the -2.36 mm material is screened and sent to the first buffer bin; the material in the first buffer bin is then sent to the powder selector, and after the stone powder is removed, it is sent to the third buffer bin;

[0067] S5. In step S3, 75% of the materials with a size of +2.36 mm on the screen are returned to the crusher through the belt conveyor, and 25% are sent to the third buffer bin for grading.

[0068] S6. The graded materials in the third buffer bin are sent to the mixer for humidification and mixing, and then sent to the finished product warehouse to obtain qualified machine-made sand.

[0069] According to the standard GB / T 14684-2011 "Sand for Construction", the indexes of the machine-made sand prepared in Example 3 were tested, and the results are shown in Table 2.

[0070] Table 2

[0071]

[0072] Example 4

[0073] This embodiment provides a process for processing machine-made sand. The difference between this embodiment and Embodiment 2 is that the +2.36 mm material after screening in step (5) is not returned to the crusher.

[0074] The indexes were tested according to the standard GB / T 14684-2011 "Sand for Construction". The results are shown in Table 3.

[0075] Table 3

[0076]

[0077] Comparative Example 1

[0078] The difference between this comparative example and Example 1 is that the raw materials are not pre-classified.

[0079] The indexes were tested according to the standard GB / T 14684-2011 “Sand for Construction”. The results are shown in Table 4.

[0080] Table 4

[0081]

[0082] Comparative Example 2

[0083] The difference between this comparative example and embodiment 1 is that a hammer crusher is used as the crusher.

[0084] The indicators were tested according to the standard GB / T 14684-2011 "Sand for Construction". The results are shown in Table 5.

[0085] Table 5

[0086]

[0087] As can be seen from Examples 1-2 above, the quality of the machine-made sand produced by the present invention reaches the standard of medium sand for construction, and provides an effective solution for the disposal of stone chips in aggregate production.

[0088] Referring to Example 1 and Implementation 3, the lack of step (5) to control the diversion of +2.36 mm materials makes it difficult to ensure the particle size distribution of the product, and the index requirements of medium sand cannot be met.

[0089] Referring to Example 1 and Comparative Example 1, it can be seen that the yield of stone powder is significantly increased without pre-classification of the raw materials.

[0090] It can be seen from Example 1 and Comparative Example 2 that when a hammer crusher or the like is used, the particle size distribution of the product is uneven, and the content of coarse particles and fine particles is relatively large.

[0091] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A process for processing machine-made sand, characterized in that: The following steps are involved: S1, sending the stone chips into a high-frequency vibrating screen for pre-classification; the screened materials include a first material and a second material; S2, sending the first material obtained after screening in step S1 into the first buffer bin; sending the second material obtained after screening in step S1 into the second buffer bin and crushing it by a crusher; S3, sending the material crushed by the crusher in step S2 to a high-frequency vibrating screen for classification, and obtaining the undersize material and the oversize material; S4, sending the undersize material obtained in step S3 to the first buffer bin; returning part of the oversize material obtained in step S3 to the crusher through a belt conveyor; sending part of the oversize material obtained in step S3 to the third buffer bin; S5, sending the material in the first buffer bin to the powder selector, and after removing the stone powder, sending it to the third buffer bin; S6. Grade the materials in the third buffer bin, send them into a mixer for humidification and mixing, and then send them into a finished product warehouse to obtain qualified machine-made sand.

2. The process for processing machine-made sand according to claim 1, characterized in that: The stone chips described in step S1 are -5 mm stones produced by aggregate processing, that is, stones with a particle size of 0 to 5 mm.

3. The process for processing machine-made sand according to claim 1, characterized in that: The first material is a -2.36mm material, that is, a material with a particle size of 0mm to 2.36mm; the second material is a +2.36mm material, that is, a material with a particle size of 2.36mm to 5mm.

4. The process for processing machine-made sand according to claim 1, characterized in that: In step S2, the crusher is a vertical shaft impact crusher.

5. The process for processing machine-made sand according to claim 1, characterized in that: In step S3, the aperture of the high-frequency vibration screen is 2.36 mm.

6. The process for processing machine-made sand according to claim 1, characterized in that: In step S4, 50% to 100% of the oversize material obtained in step S3 is returned to the crusher through a belt conveyor; and 0% to 50% of the oversize material obtained in step S3 is sent to a third buffer bin.

7. The process for processing machine-made sand according to claim 1, characterized in that: In step S4, the removed stone powder is -0.074 mm stone powder, that is, the particle size is 0 to 0.074 mm.

8. The process for processing machine-made sand according to claim 1, characterized in that: The number of the high-frequency vibrating screens is 5, namely the first high-frequency vibrating screen, the second high-frequency vibrating screen, the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen; in step S1, the stone chips are sent to the first high-frequency vibrating screen and the second high-frequency vibrating screen for pre-classification; in step S3, the materials crushed by the crusher in step S2 are sent to the third high-frequency vibrating screen, the fourth high-frequency vibrating screen, and the fifth high-frequency vibrating screen for classification.

9. A machine-made sand processing device, characterized in that: Used to carry out the machine-made sand processing process as described in any one of claims 1 to 8; comprising an elevator, a sand-making building, a crusher, a buffer bin, a powder classifier and a finished product warehouse, the elevator is used to transport stone chips to the sand-making building; a high-frequency vibrating screen is provided on the top of the sand-making building, the high-frequency vibrating screen is used to classify materials, and the powder classifier is used to remove impurities.

10. The process for processing machine-made sand according to claim 9, characterized in that: A belt conveyor is arranged between the crusher and the high-frequency vibrating screen.

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