Processing system and processing method for preparing artificial aggregate based on sand slate

Abstract

The invention relates to a processing system and a processing method for preparing artificial aggregate based on sand slate. A coarse crushing workshop, an intermediate crushing workshop, a fine crushing workshop, an ultra-fine crushing sand making workshop, a rod mill sand making workshop, a first screening workshop, a second screening workshop, a third screening workshop, a small stone secondary washing workshop, a pre-screening workshop, a sand washing workshop and a fine sand recycling workshop are arranged, and the aggregate processing method based on sand and stone circulation among the workshops is adopted. The problems that the needle-sheet-shaped coarse aggregate exceeds the standard, the powder wrapping exceeds the standard, the fineness modulus is unstable, the stone powder content is unstable and the oily carbon substance exceeds the standard are solved, and the artificial aggregate meeting the construction requirement is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of concrete aggregate preparation, and in particular to a processing system and a processing method for preparing artificial aggregate based on sandstone. Background Art

[0002] With the rapid development of hydropower engineering construction in my country, the production of concrete sand and gravel aggregates has also expanded rapidly. In early hydropower projects, natural sand and gravel aggregates were mostly used, but the reserves of natural sand were limited and the distribution was not concentrated. With the continuous progress of society, natural sand concrete aggregates could not meet the needs of engineering construction, so the production of artificial concrete aggregates developed rapidly, and the production technology has been continuously developed and improved.

[0003] The artificial aggregate sources for hydropower projects are mostly basalt, granite and limestone. Currently, the artificial aggregate processing systems and methods based on the above sources are relatively mature and common.

[0004] Sandstone is a rare source of material. It has the following characteristics: (1) The original rock is a hard-to-crush stone with a rock strength of 182 MPa; (2) It has a very high silica content of 74% to 79%; (3) It contains oily carbon; (4) Sandstone and slate are mostly interlayered with different thicknesses and the proportion of each layer varies. Based on the above characteristics, sandstone is used as a raw material for preparing artificial aggregate. It is easy to produce coarse aggregate needle-like flakes exceeding the standard, powder coating exceeding the standard, unstable fineness modulus, unstable stone powder content, excessive oily carbon, and strong adhesion of oily carbon, which is dispersed on the surface of finished sand, causing the finished sand to dehydrate slowly, especially when the sand pile reaches internal water saturation, it is extremely difficult to dehydrate. In addition, the oily carbon in artificial sand and stone aggregate has a significant impact on the water consumption and air content of concrete, and has a certain impact on the cracks in concrete. The content of oily carbon in the finished sand must be controlled within 0.015%.

[0005] Currently, there is no perfect processing system and method for preparing artificial aggregate from sandstone. Summary of the invention

[0006] Based on the above technical problems, the present invention provides a processing system and a processing method for preparing artificial aggregate based on sandstone, which can obtain artificial aggregate that meets the requirements and provides a standard processing system and a processing method for preparing artificial aggregate from sandstone.

[0007] Specifically, the present invention provides a processing system for preparing artificial aggregate based on sandstone, and the processing system includes: The primary crushing workshop is equipped with a bar feeder and a jaw crusher; the intermediate and fine crushing workshop is equipped with an impact crusher; the first screening workshop is equipped with a circular vibrating screen; the ultra-fine crushing and sand-making workshop is equipped with an electromagnetic vibrating feeder and a vertical shaft impact crusher; the second screening workshop is equipped with a high-frequency vibrating screen; the third screening workshop is equipped with a circular vibrating screen; the sand washing workshop is equipped with a spiral classifier and a linear vibrating screen; the rod mill sand-making workshop is equipped with a vibrating feeder, a rod mill, a spiral classifier and a linear vibrating screen; The processing system further includes: an intermediate crushing workshop equipped with a cone crusher; a fine crushing workshop equipped with a cone crusher; a pre-screening workshop equipped with an electromagnetic vibrating feeder and a circular vibrating screen; a small stone secondary washing workshop equipped with a circular vibrating screen; and a fine sand recovery workshop equipped with a fine sand recovery device; the intermediate crushing workshop is located between the primary crushing workshop and the intermediate and fine crushing workshop; the fine crushing workshop is connected to the first screening workshop and the second screening workshop at the same time; the pre-screening workshop is connected after the first screening workshop and before the second screening workshop; the small stone secondary washing workshop is located after the third screening workshop; each workshop is connected by a belt conveyor to realize the transfer of materials; Among them, the fine sand recovery workshop is fluidly connected to the small stone secondary washing workshop, the third screening workshop, the sand washing workshop and the rod mill sand-making workshop through a collecting pool.

[0008] A further technical solution is: there is a semi-finished product bin between the primary crushing workshop and the intermediate crushing workshop, and the semi-finished product bin is equipped with an electromagnetic vibrating feeder.

[0009] A further technical solution is: the first screening workshop, the second screening workshop and the ultra-fine sand-making workshop are respectively connected to a dust removal workshop.

[0010] On the other hand, the present invention also provides a processing method for preparing artificial aggregate based on sand slate. Using the processing system for preparing artificial aggregate based on sand slate of the present invention, the specific steps are as follows: S1: Send the raw materials to the primary crushing workshop for crushing and mixing, then send them to the intermediate crushing workshop for crushing, and then send them to the intermediate and fine crushing workshop; S2: The materials crushed in the intermediate and fine crushing workshop are transported to the first screening workshop for cleaning and screening, separating out materials larger than 80mm, large stones of 40-80mm, medium stones of 20-40mm, and materials smaller than 20mm; S3: Part of the large stones are transported to the large stone yard; the remaining large stones and materials larger than 80mm are transferred to the intermediate crushing workshop again; S4: Part of the medium stones are sent to the medium stone yard; a part of the remaining medium stones are sent to the ultra-fine crushing and sand-making workshop, and the remaining part is sent to the fine crushing workshop for crushing and then sent to the ultra-fine crushing and sand-making workshop; materials smaller than 20mm are sent to the pre-screening workshop for mixing, cleaning and screening, and materials of 3-20mm are sent to the ultra-fine crushing and sand-making workshop; S5: After the materials in the ultra-fine crushing and sand-making workshop are evenly mixed and crushed, they enter the second screening workshop for cleaning and screening, separating medium-sized stones of 20-40 mm, small stones of 5-20 mm, materials of 3-5 mm, and materials less than 3 mm. S6: A part of the medium-sized stones in S5 is sent to the medium-sized stone yard, and the remaining medium-sized stones are returned to the ultra-fine crushing and sand-making workshop for circulation. S7: A part of the small stones in S5 is sent to the third screening workshop to be screened into materials of 10-20 mm, materials of 5-10 mm, and materials less than 5 mm. The materials less than 5 mm enter the fine sand recovery workshop; the remaining small stones are transported to the small stone yard. S8: A part of the 10-20 mm materials in S7 is returned to the ultra-fine crushing and sand-making workshop for circulation, a part of the 5-10 mm materials is transported to the concrete aggregate yard, the remaining 10-20 mm and 5-10 mm materials enter the small stone secondary flushing workshop for cleaning and screening, the 5-20 mm materials are transported to the small stone yard, and the materials less than 5 mm enter the fine sand recovery workshop. S9: A part of the 3-5 mm materials in S5 is transported to the sand yard; the remaining part is sent to the rod mill sand-making workshop for even mixing, crushing, grinding, and sand washing. The oversize part is transported to the sand yard, and the undersize part enters the fine sand recovery workshop. S10: The materials less than 3 mm enter the sand washing workshop for sand washing and then circulate to the fine sand recovery workshop.

[0011] A further technical solution is that the sand recovered by the fine sand recovery workshop is transported to the sand yard.

[0012] A further technical solution is that in S4, the pre-screening workshop uses a 2YKR2460 circular vibrating screen, with a lower-layer screen mesh of 3×3 mm and a lower-layer screen mesh of 10×10 mm.

[0013] A further technical solution is that in S4, the 3-20 mm materials screened out by the pre-screening workshop are transported to a transfer bin, and a ground tunnel is set at the lower part of the transfer bin, and they are transported to the ultra-fine crushing and sand-making workshop through the belt conveyor set in the ground tunnel.

[0014] A further technical solution is that the processing method is carried out according to wet production.

[0015] A further technical solution is that in S3, the 40-80 mm large stones are transported to the large stone yard after being cleaned by a straight vibrating screen.

[0016] A further technical solution is that a large amount of medium water is used for sand washing, and the washing water volume is controlled at 60-70 t / h.

[0017] A further technical solution is that in S10, before the materials less than 3 mm enter the sand washing, 15-25% of the dry sand is sent into the sand bin through a chute.

[0018] Specifically, a processing method for preparing artificial aggregate based on slate provided by the present invention uses the processing system for preparing artificial aggregate based on slate of the present invention, and the specific steps are as follows: (1) The raw materials mined from the quarry are transported to the receiving bin; the particle size of the raw materials is controlled below 800 mm; (2) The raw materials in the receiving bin are transported to the primary crushing workshop by a belt conveyor, and after being mixed evenly by a bar feeder, they enter a jaw crusher for crushing to form a first material, and the first material is transported to the semi-finished product bin by a belt conveyor; (3) After the motor vibrating feeder in the semi-finished product bin mixes the first material evenly, the first material is transported to a cone crusher in the secondary crushing workshop by a belt conveyor for crushing to form a second material, and the second material is transported to the secondary and fine crushing workshop by a belt conveyor; (4) The impact crusher in the secondary and fine crushing workshop crushes and shapes the second material to form a third material, and the third material is transported to the first screening workshop by a belt conveyor; (5) The circular vibrating screen in the first screening workshop cleans and screens the third material, screening out materials larger than 80 mm, 40 - 80 mm large stones, 20 - 40 mm medium stones, and materials smaller than 20 mm; (6) Part of the 40 - 80 mm large stones in step (5) are transported to the large stone yard; (7) The remaining 40 - 80 mm large stones and materials larger than 80 mm in step (5) are transported back to the secondary crushing workshop by a belt conveyor again, and are merged into the first material in step (3) for subsequent processes; (8) Part of the 20 - 40 mm medium stones in step (5) are transported to the medium stone yard; (9) Part of the remaining 20 - 40 mm medium stones in step (5) are directly sent to the ultra-fine crushing and sand making workshop by a belt conveyor, and the rest enter the fine crushing workshop through a belt conveyor, and after being crushed by a cone crusher, they enter the ultra-fine crushing and sand making workshop through a belt conveyor; (10) The materials smaller than 20 mm in step (5) are transported to the pre-screening workshop by a belt conveyor, and after being mixed evenly by a motor vibrating feeder, they are cleaned and screened by a circular vibrating screen. The materials smaller than 3 mm are transported to the sand washing workshop by a belt conveyor, and the remaining 3 - 20 mm materials are transported into the ultra-fine crushing and sand making workshop by a belt conveyor; (11) All the materials entering the ultra-fine crushing and sand making workshop in steps (9) and (10) are mixed evenly by a motor vibrating feeder, and then enter a vertical shaft crusher for crushing. After being fully crushed, they are transported to the second screening workshop by a belt conveyor; (12) The high-frequency vibrating screen in the second screening workshop cleans and screens, screening out 20 - 40 mm medium stones, 5 - 20 mm small stones, 3 - 5 mm materials, and materials smaller than 3 mm; (13) According to the demand for medium-sized stones in production and construction, a part of the 20-40mm medium-sized stones in step (12) is transported to the medium-sized stone yard, and the remaining part of the 20-40mm medium-sized stones is transported back through a belt conveyor to the ultra-fine crushing and sand-making workshop and incorporated into the materials in step (11) for circulation; (14) For the 5-20mm small stones in step (12), according to the production and construction demand, a part can be transported to the third screening workshop through a belt conveyor, and the remaining part is transported to the small stone yard; (15) The circular vibrating screen in the third screening workshop screens the 5-20mm small stones into 10-20mm materials, 5-10mm materials, and materials less than 5mm; (16) For the 10-20mm materials in step (15), according to the production and construction demand and the content ratio requirements of small stones of each size in the small stones, a part can be transported back to the ultra-fine crushing and sand-making workshop through a belt conveyor and incorporated into the materials in step (11) for subsequent process circulation; the remaining part enters the small stone secondary flushing workshop through a belt conveyor. After screening, cleaning, and screening by the original vibrating screen, the 5-20mm materials are transported to the small stone yard; a small amount of materials less than 5mm enter the fine sand recovery workshop and are recovered through the fine sand recovery device; (17) For the 5-10mm materials in step (15), according to the production and construction demand and the content ratio requirements of small stones of each size in the small stones, a part is transported to the 5-10mm concrete aggregate yard, and the remaining part enters the small stone secondary flushing workshop through a belt conveyor. After screening and cleaning by the original vibrating screen, the 5-20mm materials are transported to the small stone yard, and a small amount of materials less than 5mm enter the fine sand recovery workshop and are recovered through the fine sand recovery device; (18) The materials less than 5mm in step (15) enter the fine sand recovery workshop and are recovered through the fine sand recovery device; (19) For the 3-5mm materials in step (12), a part is transported into the 0-5mm sand yard; the remaining part is transported to the rod mill sand-making workshop through a belt conveyor. After being mixed by a vibrating feeder and entering the rod mill for crushing and grinding, it then enters a spiral classifier and a straight vibrating screen for sand washing. The materials on the screen are transported to the 0-5mm sand yard, and the materials under the screen enter the fine sand recovery workshop and are recovered through the fine sand recovery device; (20) The materials less than 3mm in step (12) are transported to the sand washing workshop through a belt conveyor; (21) The materials less than 3mm that enter the sand washing workshop in steps (10) and (20) are washed by a spiral classifier and a straight vibrating screen, then transferred to the fine sand recovery workshop and recovered through the fine sand recovery device; (22) The sand recovered by the fine sand recovery devices in steps (16), (18), (19), and (21) is transported to the 0-5mm sand yard.

[0019] A further technical solution is as follows: In step (10), a 2YKR2460 circular vibrating screen is used in the pre-screening workshop, and the lower-layer screen mesh is 3×3 mm and the lower-layer screen mesh is 10×10 mm.

[0020] A further technical solution is as follows: In step (10), the 3-20 mm materials screened out in the pre-screening workshop are conveyed to an intermediate storage bin through a belt conveyor. A ground passage is arranged below the intermediate storage bin, and the materials are conveyed to the ultra-fine crushing and sand-making workshop through the belt conveyor arranged in the ground passage.

[0021] A further technical solution is as follows: When washing sand with a spiral classifier, a large amount of medium water is used for washing, and the washing water volume is controlled at 60-70 t / h. When the washing water volume is controlled at 60-70 t / h, the content of oily carbon substances in the finished sand can be effectively reduced and can be controlled within 0.015%, thus ensuring the quality of concrete production.

[0022] A further technical solution is as follows: In step (21), before the materials less than 3 mm enter the spiral classifier, 15-25% of the dry sand is sent to the sand bin through a chute.

[0023] The beneficial effects of the present invention: 1. In the present invention, the first material in the semi-finished material yard is transported to the cone crusher through a belt conveyor. After being crushed by the cone crusher, the first material forms the second material, which is then transported to the impact crusher in the medium and fine crushing workshop through the belt conveyor. After being crushed by the impact crusher to form the third material, and then screened by the first screening workshop, the materials larger than 80 mm and part of the materials between 40 - 80 mm are transported back to the medium crushing workshop through the belt conveyor to be crushed by 2 DY1650 type cone crushers. After being crushed again by the cone crusher, the crushed mixture is transported to the vertical shaft impact crusher in the ultra-fine crushing and sand making workshop to form a closed loop. That is, by adding the medium crushing workshop and the configured cone crusher, in cooperation with the impact crusher in the medium and fine crushing workshop, the large and medium-sized stones are shaped, and combined with the aggregate processing technology of the vertical shaft impact crusher configured in the ultra-fine crushing and sand making workshop to shape the small stones, the content of flaky and needle-shaped aggregates in the sandstone aggregate is effectively controlled. 2. A small stone secondary washing workshop is newly added beside the third screening workshop and a circular vibrating screen is configured, and a 5×5 mm screen mesh is installed. The materials between 5 - 20 mm diverted from the third screening workshop are washed twice with water through the circular vibrating screen and then enter the small stone storage bin. By adding secondary washing, the powder wrapped on the small stones is eluted, and the problem of excessive powder wrapped on the small stones is solved. 3. The artificial sand production adopts a wet process, and the water flow of the stone powder is large. A fine sand recovery workshop and a fine sand recovery device are added to meet the requirements of the sand powder content. 4. Before the sand washing starts in the sand washing workshop, 15 - 25% of the dry sand is sent into the sand bin through a chute to retain a certain percentage of dry sand. 5. By adopting the large-flow strong washing method, the content of oily carbon substances is effectively reduced. Combining the above 5 points, not only can the content of flaky and needle-shaped aggregates in the coarse aggregate be effectively controlled to be less than 12%, and the powder wrapping content of the small stones after multiple transfers can be controlled within the specification, but also the high wear of the medium crushing equipment caused by the high-strength, highly abrasive sandstone can be effectively reduced; at the same time, the sand making process combining vertical shaft crushing sand making + rod mill sand making + a large amount of medium water washing + fine sand recovery + dry sand can effectively control the fineness modulus and stone powder content of the finished sand, and can effectively reduce the content of oily carbon substances in the finished sand, and ensure the production capacity.

[0024] In the present invention, for the 20 - 40 mm medium-sized stones separated by the first screening workshop, a part is transported to the medium-sized stone finished product bin through a belt conveyor, and the other part enters the newly added fine crushing workshop. The mixture produced after being crushed by the configured cone crusher is transported to the ultra-fine crushing and sand making workshop through a belt conveyor, realizing the adjustment of the medium-sized stone production balance and supplementing the materials in the ultra-fine crushing workshop.

[0025] The present invention is applicable to raw materials with lithologies such as sandstone, slate, metamorphic sandstone, metamorphic slate, high strength, high abrasiveness, and containing oily carbon substances. Description of the Drawings

[0026] Figure 1 It is a schematic flow chart of the workshop distribution and processing method of the processing system of the present invention. Detailed Implementation Modes

[0027] The present invention will now be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0028] In the description of the present invention, it should be noted that terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation to the invention.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] A processing system for preparing artificial aggregate based on slate in the present invention, as shown in Figure 1 The processing system includes: a primary crushing workshop, equipped with a grizzly feeder and a jaw crusher; an intermediate and fine crushing workshop, equipped with a counterattack crusher; a first screening workshop, equipped with a circular vibrating screen; an ultra-fine crushing and sand-making workshop, equipped with an electromagnetic vibrating feeder and a vertical shaft impact crusher; a second screening workshop, equipped with a high-frequency vibrating screen; a third screening workshop, equipped with a circular vibrating screen; a sand washing workshop, equipped with a spiral classifier and a linear vibrating screen; a rod mill sand-making workshop, equipped with a vibrating feeder, a rod mill, a spiral classifier and a linear vibrating screen; the processing system also includes: an intermediate crushing workshop, equipped with a cone crusher; a fine crushing workshop, equipped with a cone crusher; a pre-screening workshop, equipped with an electromagnetic vibrating feeder and a circular vibrating screen; a secondary washing workshop for small stones, equipped with a circular vibrating screen; and a fine sand recovery workshop, equipped with a fine sand recovery device; the intermediate crushing workshop is located between the primary crushing workshop and the intermediate and fine crushing workshop; the fine crushing workshop is connected to the first screening workshop and the second screening workshop respectively; the pre-screening workshop is connected after the first screening workshop and before the second screening workshop; the secondary washing workshop for small stones is located after the third screening workshop; each workshop is connected by a belt conveyor to realize the flow of materials; among them, the fine sand recovery workshop is fluidly connected to the secondary washing workshop for small stones, the third screening workshop, the sand washing workshop and the rod mill sand-making workshop through a collecting pool.

[0031] Among them, a semi-finished product bin is provided between the coarse crushing workshop and the medium crushing workshop, and the semi-finished product bin is equipped with an electric vibrating feeder. In addition, a dust removal workshop is connected to the first screening workshop, the second screening workshop, and the ultra-fine sand making workshop respectively.

[0032] Similarly combined with Figure 1 As shown, based on the processing system for preparing artificial aggregate from sand slate, the processing method for preparing artificial aggregate from sand slate is as follows: (1) The raw materials mined from the quarry are transported to the receiving bin; the particle size of the raw materials is controlled below 800 mm; (2) The raw materials in the receiving bin are transported to the coarse crushing workshop through a belt conveyor, and after being mixed evenly by a bar feeder, they enter a jaw crusher for crushing to form the first material, and the first material is transported to the semi-finished product bin through a belt conveyor; (3) After the electric vibrating feeder in the semi-finished product bin mixes the first material evenly, the first material is transported to the cone crusher in the medium crushing workshop through a belt conveyor for crushing to form the second material, and the second material is transported to the medium and fine crushing workshop through a belt conveyor; (4) The impact crusher in the medium and fine crushing workshop crushes and shapes the second material to form the third material, and the third material is transported to the first screening workshop through a belt conveyor; (5) The circular vibrating screen in the first screening workshop cleans and screens the third material, screening out materials larger than 80 mm, 40 - 80 mm large stones, 20 - 40 mm medium stones, and materials smaller than 20 mm; (6) Part of the 40 - 80 mm large stones in step (5) are transported to the large stone yard after being cleaned by a straight vibrating screen; (7) The remaining 40 - 80 mm large stones in step (5) and the materials larger than 80 mm are transported back to the medium crushing workshop through a belt conveyor again, and are incorporated into the first material in step (3) for subsequent processes; (8) Part of the 20 - 40 mm medium stones in step (5) are transported to the medium stone yard; (9) A part of the remaining 20 - 40 mm medium stones in step (5) are directly sent to the ultra-fine crushing and sand making workshop through a belt conveyor, and the rest enter the fine crushing workshop through a belt conveyor, and after being crushed by a cone crusher, they enter the ultra-fine crushing and sand making workshop through a belt conveyor; (10) The materials less than 20 mm in step (5) are sent to the pre-screening workshop by a belt conveyor. After being homogenized by an electric vibrating feeder, they are cleaned and screened by a circular vibrating screen. The materials less than 3 mm are transported to the sand washing workshop by a belt conveyor, and the remaining materials of 3-20 mm are transported into the ultra-fine crushing and sand making workshop by a belt conveyor. The pre-screening workshop uses a 2YKR2460 circular vibrating screen, with a lower layer screen mesh of 3×3 mm and a lower layer screen mesh of 10×10 mm. The materials of 3-20 mm screened out in the pre-screening workshop are transported to a transfer bin by a belt conveyor. A ground passage is set at the lower part of the transfer bin, and the materials are transported to the ultra-fine crushing and sand making workshop through the belt conveyor set in the ground passage. (11) All the materials entering the ultra-fine crushing and sand making workshop in steps (9) and (10) are homogenized by an electric vibrating feeder and then enter a vertical shaft crusher for crushing. After being fully crushed, they are transported by a belt conveyor into the second screening workshop. (12) The high-frequency vibrating screen in the second screening workshop is used for cleaning and screening, screening out medium-sized stones of 20-40 mm, small-sized stones of 5-20 mm, materials of 3-5 mm, and materials less than 3 mm. (13) According to the demand for medium-sized stones in production and construction, a part of the medium-sized stones of 20-40 mm in step (12) is transported to the medium-sized stone yard, and the remaining part of the medium-sized stones of 20-40 mm is transported back to the ultra-fine crushing and sand making workshop by a belt conveyor and incorporated into the materials in step (11) for subsequent circulation. (14) For the small-sized stones of 5-20 mm in step (12), according to the demand in production and construction, a part can be transported to the third screening workshop by a belt conveyor, and the remaining part is transported to the small-sized stone yard. (15) The circular vibrating screen in the third screening workshop screens the small-sized stones of 5-20 mm into materials of 10-20 mm, materials of 5-10 mm, and materials less than 5 mm. (16) For the materials of 10-20 mm in step (15), according to the demand in production and construction and the content ratio requirements of small-sized stones of various sizes in the small-sized stones, a part can be transported back to the ultra-fine crushing and sand making workshop by a belt conveyor and incorporated into the materials in step (11) for subsequent process circulation; the remaining part enters the small-sized stone secondary flushing workshop by a belt conveyor. After being screened, cleaned and screened by the original vibrating screen, the materials of 5-20 mm are transported to the small-sized stone yard; a small amount of materials less than 5 mm enter the fine sand recovery workshop and are recovered by a fine sand recovery device. (17) For the materials of 5-10 mm in step (15), according to the demand in production and construction and the content ratio requirements of small-sized stones of various sizes in the small-sized stones, a part is transported to the 5-10 mm concrete aggregate yard, and the remaining part enters the small-sized stone secondary flushing workshop by a belt conveyor. After being screened and cleaned by the original vibrating screen, the materials of 5-20 mm are transported to the small-sized stone yard, and a small amount of materials less than 5 mm enter the fine sand recovery workshop and are recovered by a fine sand recovery device. (18) The materials less than 5 mm in step (15) enter the fine sand recovery workshop and are recovered by the fine sand recovery device; (19) For the materials of 3 - 5 mm in step (12), a part is transported to the 0 - 5 mm sand yard; the remaining part is transported to the rod mill sand making workshop by the belt conveyor, evenly fed by the vibrating feeder and then enters the rod mill for crushing and grinding. After that, it enters the spiral classifier and the straight vibrating screen for sand washing. The materials on the screen are transported to the 0 - 5 mm sand yard, and the materials under the screen enter the fine sand recovery workshop and are recovered by the fine sand recovery device; (20) The materials less than 3 mm in step (12) are transported to the sand washing workshop by the belt conveyor; (21) Before the materials less than 3 mm entering the spiral classifier in steps (10) and (20) enter the sand washing workshop, 15 - 25% of the dry sand is sent to the sand bin through the chute, and the remaining part is washed by the spiral classifier and the straight vibrating screen, then transferred to the fine sand recovery workshop and recovered by the fine sand recovery device; (22) The sand recovered by the fine sand recovery device in steps (16), (18), (19) and (21) is transported to the 0 - 5 mm sand yard.

[0033] The processing method of the present invention is carried out according to wet production.

[0034] In the present invention, a large amount of medium water is used for sand washing by the spiral classifier, and the washing water volume is controlled at 60 - 70 t / h.

[0035] The original vibrating screen in the small stone secondary washing workshop is set with a 5×5 mm screen mesh.

[0036] The processing system and processing method of the present invention will be described in detail below with a specific engineering example.

[0037] For the construction of a certain hydropower station dam project, the material source is mined from the construction area A stone yard, and the material source is mainly sand slate mined from the A stone yard. The main physical and mechanical test results are shown in Table 1 below.

[0038] Table 1: Table of original rock physical and mechanical test results

[0039] According to the "Design Specification for Sand and Gravel Processing System in Hydropower Projects" (DL / T5098 - 2010), "Construction Organization Design Manual for Water Conservancy and Hydropower Projects" and the above data: The crushability of the rock is difficult - to - crush rock.

[0040] In practical applications, various aggregates need to comply with the "Code for Construction of Hydraulic Concrete" (DL / 5144 - 2015), as shown in Table 2 and Table 3 below.

[0041] Table 2: Quality technical requirements for hydraulic fine aggregates (sand)

[0042] Table 3: Quality and Technical Requirements for Coarse Aggregates for Hydraulic Engineering

[0043] In addition, the original rock contains an oily carbon substance, which appears for the first time in the domestic sand and gravel industry. It has relatively high viscosity and oiliness, and it is necessary to ensure that the content of this substance is controlled within 0.015%.

[0044] Based on the above material sources and quality requirements, the concrete aggregate processing system of Stone Yard A used in the construction of the power station dam project has a designed processing capacity of 1400 t / h and a designed production capacity of 1100 t / h (including 500 t / h of finished sand production, and the sand ratio reaches 45%). The specific processing system and processing method are as follows: 1. The raw materials mined from the stone yard are transported to the receiving bin, and the particle size of the raw materials is controlled below 800 mm.

[0045] 2. The raw materials in the receiving bin are transported to the coarse crushing workshop through a belt conveyor. After being mixed evenly by an HPF1560(S) type bar feeder, they enter a C125 type jaw crusher for crushing to form the first material, and the first material is transported to the semi-finished material bin through a belt conveyor.

[0046] 3. After being mixed evenly by a GZG150-160 type motor vibrating feeder in the semi-finished material bin, the first material is transported to a 1650 type cone crusher in the medium crushing workshop through a belt conveyor for crushing to form the second material, and the second material is transported to the medium and fine crushing workshop through a belt conveyor.

[0047] 4. The CI532 type impact crusher in the medium and fine crushing workshop crushes and shapes the second material to form the third material, and the third material is transported to the first screening workshop through a belt conveyor.

[0048] 5. The 3YKR2460 type circular vibrating screen in the first screening workshop cleans and screens the third material, screening out materials larger than 80 mm, 40 - 80 mm large stones, 20 - 40 mm medium stones, and materials smaller than 20 mm.

[0049] 6. Some of the 40 - 80 mm large stones in Step 5 are transported to the large stone yard after being cleaned by a linear vibrating screen.

[0050] 7. The remaining 40 - 80 mm large stones in Step 5 and the materials larger than 80 mm are transported back to the medium crushing workshop through a belt conveyor again and merged into the first material in Step 3 for subsequent processes.

[0051] 8. Some of the 20 - 40 mm medium stones in Step 5 are transported to the medium stone yard.

[0052] 9. A part of the 20 - 40 mm medium-sized stones remaining in the 5th step is directly fed into the ultra-fine crushing and sand-making workshop through a belt conveyor, and the rest is fed into the fine crushing workshop through a belt conveyor. After being crushed by an S155D fine-type cone crusher, it is then fed into the ultra-fine crushing and sand-making workshop through a belt conveyor.

[0053] 10. The materials less than 20 mm in the 5th step are sent to the pre-screening workshop through a belt conveyor. After being mixed evenly by a GZG110 - 150 type motor vibrating feeder, they are cleaned and screened by a 2YKR2460 type circular vibrating screen. The materials less than 3 mm are transported to the sand washing workshop through a belt conveyor, and the remaining 3 - 20 mm materials are transported into the ultra-fine crushing and sand-making workshop through a belt conveyor; the 2YKR2460 type circular vibrating screen used in the pre-screening workshop is installed with a lower screen mesh of 3×3 mm and a lower screen mesh of 10×10 mm; the 3 - 20 mm materials screened out in the pre-screening workshop are transported to a transfer bin through a belt conveyor, and a ground passage is set at the lower part of the transfer bin, and they are transported to the ultra-fine crushing and sand-making workshop through the belt conveyor set in the ground passage.

[0054] 11. All the materials entering the ultra-fine crushing and sand-making workshop in the 9th step and the 10th step are mixed evenly by a GZG110 - 150 type motor vibrating feeder, and then enter a B9100SE type vertical shaft crusher for crushing. After being fully crushed, they are transported into the second screening workshop through a belt conveyor.

[0055] 12. A 3618VM type high-frequency vibrating screen in the second screening workshop is used for cleaning and screening, screening out 20 - 40 mm medium-sized stones, 5 - 20 mm small stones, 3 - 5 mm materials, and materials less than 3 mm.

[0056] 13. A part of the 20 - 40 mm medium-sized stones in the 12th step is transported to the medium-sized stone yard, and the remaining 20 - 40 mm medium-sized stones are transported back to the ultra-fine crushing and sand-making workshop through a belt conveyor and incorporated into the materials in the 11th step for circulation.

[0057] 14. For the 5 - 20 mm small stones in the 12th step, a part is transported to the third screening workshop through a belt conveyor, and the remaining part is transported to the small stone yard.

[0058] 15. A 2YKR2060 type circular vibrating screen in the third screening workshop screens the 5 - 20 mm small stones into 10 - 20 mm materials, 5 - 10 mm materials, and materials less than 5 mm.

[0059] 16. For the 10 - 20 mm materials from the previous step, a part is returned to the ultra - fine crushing and sand - making workshop through a belt conveyor and incorporated into the materials in Step 11 for subsequent process flow; the remaining part enters the small - stone secondary flushing workshop through a belt conveyor. After screening, cleaning, and screening by the original 2YKR2260 vibrating screen with a 5×5 mm screen mesh, the 5 - 20 mm materials are transported to the small - stone yard; a small amount of materials less than 5 mm enter the fine - sand recovery workshop and are recovered through the fine - sand recovery device.

[0060] 17. For the 5 - 10 mm materials in Step 15, a part is transported to the 5 - 10 mm concrete aggregate yard, and the remaining part enters the small - stone secondary flushing workshop through a belt conveyor. After screening and cleaning by the original 2YKR2260 vibrating screen with a 5×5 mm screen mesh, the 5 - 20 mm materials are transported to the small - stone yard, and a small amount of materials less than 5 mm enter the fine - sand recovery workshop and are recovered through the fine - sand recovery device.

[0061] 18. The materials less than 5 mm in Step 15 enter the fine - sand recovery workshop and are recovered through the fine - sand recovery device.

[0062] 19. For the 3 - 5 mm materials in Step 12, a part is transported into the 0 - 5 mm sand yard; the remaining part is transported to the rod - mill sand - making workshop through a belt conveyor. After being mixed by the GZG60 - 100 vibrating feeder and then entering the MBZ2136 rod mill for crushing and grinding, it then enters the GZG60 - 100 spiral classifier and the ZKR1237 linear vibrating screen for a large amount of sand washing and screening. The washing water volume is controlled at 60 - 70 t / h. The over - sized part is transported to the 0 - 5 mm sand yard, and the undersized part enters the fine - sand recovery workshop and is recovered through the fine - sand recovery device.

[0063] 20. The materials less than 3 mm in Step 12 are transported to the sand - washing workshop through a belt conveyor.

[0064] 21. Before the materials less than 3 mm entering the sand - washing workshop in Step 10 and Step 20 enter the spiral classifier, 15 - 25% of the dry sand is sent into the sand bin through a chute, and the remaining part is subjected to a large amount of sand washing and screening by the FC - 20 spiral classifier and the ZKR1645 linear vibrating screen. The washing water volume is controlled at 60 - 70 t / h, and then it flows to the fine - sand recovery workshop and is recovered through the fine - sand recovery device.

[0065] 22. The sand recovered by the fine - sand recovery device in Step 16, Step 18, Step 19, and Step 20 is transported to the 0 - 5 mm sand yard.

[0066] During the production process, the proportion of dry sand in the 21st step can be adjusted to facilitate the proportional mixing of dry sand and semi-finished sand, further meeting the requirements of fineness modulus and stone powder content. Using the above processing system and processing method, the obtained finished sand has a fineness modulus of 2.7 - 2.75, a stone powder content of 15 - 17.5%, a needle and flake content of coarse aggregate less than 12%, and an oily carbon substance content of finished sand less than 0.015%. It meets the aggregate requirements for the construction of the dam project of this hydropower station.

[0067] Enlightened by the above ideal embodiments based on the present invention, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A processing system for preparing artificial aggregate based on slate, characterized in that, The processing system includes: A primary crushing workshop, equipped with a grizzly feeder and a jaw crusher; an intermediate and fine crushing workshop, equipped with a counterattack crusher; a first screening workshop, equipped with a circular vibrating screen; an ultra-fine crushing and sand making workshop, equipped with an electromagnetic vibrating feeder and a vertical shaft impact crusher; a second screening workshop, equipped with a high-frequency vibrating screen; a third screening workshop, equipped with a circular vibrating screen; a sand washing workshop, equipped with a spiral classifier and a linear vibrating screen; a rod mill sand making workshop, equipped with a vibrating feeder, a rod mill, a spiral classifier and a linear vibrating screen; The processing system further includes: an intermediate crushing workshop, equipped with a cone crusher; a fine crushing workshop, equipped with a cone crusher; a pre-screening workshop, equipped with an electromagnetic vibrating feeder and a circular vibrating screen; a small stone secondary washing workshop, equipped with a circular vibrating screen; and a fine sand recovery workshop, equipped with a fine sand recovery device; the intermediate crushing workshop is located between the primary crushing workshop and the intermediate and fine crushing workshop; the fine crushing workshop is connected to the first screening workshop and the second screening workshop respectively after them; the pre-screening workshop is connected after the first screening workshop and before the second screening workshop; the small stone secondary washing workshop is located after the third screening workshop; each workshop is connected by a belt conveyor to realize the transfer of materials; Among them, the fine sand recovery workshop is fluidly connected to the small stone secondary washing workshop, the third screening workshop, the sand washing workshop and the rod mill sand making workshop respectively through a collecting tank.

2. The processing system for preparing artificial aggregate based on slate according to claim 1, wherein, A semi-finished product bin is provided between the primary crushing workshop and the intermediate crushing workshop, and the semi-finished product bin is equipped with an electromagnetic vibrating feeder.

3. The processing system for preparing artificial aggregate based on slate according to claim 1, characterized in that, Dust removal workshops are respectively connected to the first screening workshop, the second screening workshop and the ultra-fine sand making workshop.

4. A processing method for preparing artificial aggregate based on slate, characterized in that, Using the processing system for preparing artificial aggregate based on sand slate as described in claim 1 or 2, the following steps are included: S1: Feed the raw materials to the primary crushing workshop for crushing and mixing, then send them to the intermediate crushing workshop for crushing, and then send them to the intermediate and fine crushing workshop; S2: The materials crushed in the intermediate and fine crushing workshop are transported to the first screening workshop for cleaning and screening, separating materials larger than 80mm, 40 - 80mm large stones, 20 - 40mm medium stones, and materials smaller than 20mm; S3: Part of the large stones are transported to the large stone yard; the remaining large stones and materials larger than 80mm are sent to the intermediate crushing workshop for circulation; S4: Part of the medium stones are sent to the medium stone yard; a part of the remaining medium stones is sent to the ultra-fine crushing and sand making workshop, and the remaining part is sent to the fine crushing workshop for crushing and then sent to the ultra-fine crushing and sand making workshop; materials smaller than 20mm are sent to the pre-screening workshop for mixing, cleaning and screening, and materials of 3 - 20mm are sent to the ultra-fine crushing and sand making workshop; S5: The materials in the ultra-fine crushing and sand making workshop are mixed and crushed and then enter the second screening workshop for cleaning and screening, separating 20 - 40mm medium stones, 5 - 20mm small stones, 3 - 5mm materials, and materials smaller than 3mm; S6: Part of the medium stones in S5 are sent to the medium stone yard, and the remaining medium stones are returned to the ultra-fine crushing and sand making workshop for circulation; S7: Part of the small stones in S5 are sent to the third screening workshop for screening into materials of 10 - 20mm, 5 - 10mm and materials smaller than 5mm, and materials smaller than 5mm enter the fine sand recovery workshop; the remaining small stones are transported to the small stone yard; S8: Part of the 10 - 20 mm material from S7 is returned to the ultra - fine crushing and sand - making workshop for circulation, part of the 5 - 10 mm material is transported to the concrete aggregate storage yard, and the remaining 10 - 20 mm and 5 - 10 mm materials enter the small - stone secondary flushing workshop for cleaning and screening. The 5 - 20 mm material is transported to the small - stone storage yard, and the material less than 5 mm enters the fine - sand recovery workshop; S9: Part of the 3 - 5 mm material from S5 is transported to the sand storage yard; the remaining part is sent to the rod mill sand - making workshop for mixing, crushing, grinding and sand washing. The over - sized part after screening is transported to the sand storage yard, and the undersized part enters the fine - sand recovery workshop; S10: The material less than 3 mm enters the sand - washing workshop for sand washing and then circulates to the fine - sand recovery workshop.

5. A processing method for preparing artificial aggregates based on slate, according to claim 4, characterized in that, In S4, the pre - screening workshop uses a 2YKR2460 type circular vibrating screen, with the lower - layer screen mesh of 3×3 mm and the lower - layer screen mesh of 10×10 mm installed.

6. The processing method for preparing artificial aggregate based on slate according to claim 4, characterized in that, In S4, the 3 - 20 mm material screened out by the pre - screening workshop is transported to a transfer bin. A ground tunnel is set at the lower part of the transfer bin, and is transported to the ultra - fine crushing and sand - making workshop through the belt conveyor set in the ground tunnel.

7. A processing method for preparing artificial aggregate based on slate, according to claim 4, characterized in that, The sand recovered by the fine - sand recovery workshop is transported to the sand storage yard.

8. A processing method for preparing artificial aggregate based on slate, according to claim 4, characterized in that In S3, the large stones are transported to the large - stone storage yard after being washed by the straight - line vibrating screen.

9. A processing method for preparing artificial aggregate based on slate, according to claim 4, characterized in that During sand washing, a large amount of medium - quality water is used for flushing, and the flushing water volume is controlled at 60 - 70 t / h.

10. A processing method for preparing artificial aggregate based on slate, as described in claim 4, characterized in that, In S10, before the material less than 3 mm enters the sand - washing process, 15 - 25% of the dry sand is sent into the sand bin through a chute.

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