CN115445741A - Method for preparing sand by utilizing rock waste high-yield preparation machine - Google Patents

Abstract

The invention discloses a method for preparing sand by utilizing rock waste in a high-yield preparation machine. The method takes rock waste as a main raw material, and provides a dry-wet combined composite process flow of 'adjustable soil removal flow-multistage segmental crushing and screening-whole product shaping and screening-wet wheel bucket sand washing fine sand recovery' so as to optimize the quality of finished machine-made sand and improve the production efficiency of the process. The invention can make the finished sand gradation more reasonable and the fineness modulus lower by the combined sand making process of the vertical impact breaking and the grinding machine, and can obtain the finished aggregate with low fineness modulus with higher yield by adopting the novel sand washing and fine sand recovering integrated machine as a sand washing and fine sand recovering device.

Description

Method for preparing sand by utilizing rock waste high-yield preparation machine

Technical Field

The invention relates to the field of sand making, in particular to a method for making sand by utilizing a rock waste high-yield preparation machine.

Background

In recent years, the demand of China for building sand is rapidly increasing, and natural river sand is increasingly scarce as a non-renewable ground material resource in a short time. With the shortage of natural river sand market supply and the continuous rise of price, the popularization and application of machine-made sand as fine aggregate have become the main direction of the mixed questionable earthwork development. The machine-made sand is rock particles which are prepared by soil removal mining, mechanical crushing and screening and have the particle size of less than 4.75mm, but does not comprise soft rock and weathered rock particles. The rock waste is the waste discharged by mining enterprises under certain technical and economic conditions, but is a potential secondary resource at the same time, and can be used as a production raw material of machine-made sand.

The production of high-quality machine-made sand has higher requirements on ores, equipment and production management. The traditional production process mainly comprises dry-method sand making, wet-method sand making and semi-dry-method sand making. The wet process crushing operation adopts water spraying for pre-wetting and dust suppression, the screening operation is carried out by adding water for washing, the water consumption is large, the mud mass is large, the occupied area of sewage treatment and mud mass stacking is large, but the surfaces of the sand stones are clean and the appearance is good. The crushing and screening operation of the dry process technology needs to be closed and adopts a bag type dust collector to solve the dust problem, the comprehensive utilization degree of the stone powder is high, but the contents of soil and organic matters and the condition that the surface of sandstone aggregate is wrapped with powder need to be strictly controlled. The semi-dry process is similar to the wet process, water is not added in the crushing and screening operation, but water is added in the pre-screening operation and the final product for washing, so that the water consumption of the full-wet production process is reduced.

In a specific production link, sand is prepared by a hard rock raw material preparation machine such as granite and the like, and the processes of soil removal, crushing, shaping, screening and the like are usually required. In the early stripping stage of the aggregate mine, the mining raw materials may contain more soil; some aggregate mines also have more soil mixed in the mine rock stratum, and soil removal is needed when the aggregate mines enter a production system, and screening (dry method) or water spraying (wet method) and other methods can be adopted. Because the hardness of rock such as granite is big, the abrasiveness is stronger, and the particle size span of the former stone is big, therefore the crushing process usually adopts the multistage crushing mode of thick, medium, thin, and main crushing equipment is: a jaw crusher, a cone crusher, a vertical shaft impact crusher, a ball mill, a double-rotor sand making machine, a vertical mill sand making machine and the like. The crushed particles tend to have poor particle types and too many needle-shaped particles, so that the particles need to be shaped. The vertical shaft impact crusher has a unique stone beating principle, can simultaneously realize crushing, crushing and shaping of materials, and is the most common shaping equipment. In order to better reduce incomplete crushing and excessive crushing and fully utilize materials with different sizes, a screening system is additionally arranged in the production process to effectively screen the materials entering the next treatment process. Commonly used screening devices are: circular vibrating screen, three-shaft oval horizontal vibrating screen, air sieving machine, etc. In addition, for controlling the content of the stone powder in the product, the dry sand making process can adopt a screening mode, and the wet sand making process can adopt a sand washing process. Excessive loss of fine sand should be avoided in the sand washing process, and dehydration treatment should be assisted.

At present, most production lines have defects due to the process flow, so that the performance index of finished machine-made sand products is far from the requirements of national and industrial standards, mainly embodied in that the aggregate has large mud content and the adaptability to additives is poor; the granule type roundness is poor, and the coagulation workability is poor; unreasonable gradation, unqualified fineness modulus and stone powder content, etc. For example, some enterprises are lack of fine particles of washing machine-made sand, poor in particle size distribution and poor in particle shape, and natural medium sand or fine sand is often needed to be matched to adjust the mixing proportion of concrete so as to obtain good working performance, so that the replacement rate of machine-made sand is low. In addition, the equipment configuration of part of production lines is unreasonable, the particle size distribution of the discharge port is more at two ends and less in the middle, on one hand, coarse materials are not completely crushed, the circulation amount in the flow is large, on the other hand, fine materials are excessively ground, the generation amount of stone powder is large, the recovery rate of fine sand is low, and the production efficiency of finished sand is low and the tailing amount is large. Chinese patent CN112439530A discloses a product named: a production line of fine granite machine-made sandstone aggregate and a process flow thereof. The technology provides the concept of 'multi-screen and less-broken', the multistage screening process is arranged, the high quality of finished aggregate can be guaranteed, the high-precision weighing and intelligent conveying system is configured on the whole line, and the automatic control of the operation of the production line is realized. The technology has the defects that a single vertical impact crusher is adopted in the fine crushing and shaping unit, so that the circulation quantity in the flow is large, the yield of the stone powder is large, and the production efficiency is low. Chinese patent CN112452502A discloses a product named as: a production line of fine basalt machine-made sandstone aggregate and a process flow thereof adopt a dry-wet combination process to realize the recovery of dust. Although a sewage circulating system is additionally arranged in the technical process, a washing and screening mode is adopted at multiple positions in the process, so that the water demand is large, and the sewage treatment pressure is high; in addition, the sand washing recovery unit is not reasonable enough, the fine sand recovery rate is low, and the device occupies a large area.

Disclosure of Invention

The invention aims to overcome the defects of the traditional technology and provide a method for preparing sand by utilizing rock waste in a high-yield preparation machine.

The invention provides a dry-wet combined composite process flow of 'adjustable soil removal flow, multistage segmental crushing and screening, whole product shaping and screening, and wet wheel bucket sand washing fine sand recovery' by taking rock waste as a main raw material so as to optimize the quality of finished machine-made sand and improve the production efficiency of the process.

The technical scheme adopted by the invention is as follows:

a method for preparing sand by utilizing a rock waste high-yield preparation machine comprises the following steps:

1) The feeding machine receives the ore, the ore is separated into oversize products and undersize products according to different particle sizes, the oversize products enter the coarse crusher for coarse crushing through the one-way rubber belt conveyor, and the undersize products enter the soil removal screen through the one-way rubber belt conveyor;

wherein the particle size of the oversize material of the feeder is more than 200mm (150 mm), and the particle size of the undersize material of the feeder is less than 200mm (150 mm);

2) The soil removing screen separates undersize of the feeding machine into oversize and undersize of the soil removing screen according to different particle sizes, the oversize of the soil removing screen enters the pre-screening through the one-way rubber belt conveyor, and the undersize of the soil removing screen is transported to a mine waste dump for storage as waste soil;

coarse crushing the oversize products of the feeder by a coarse crusher, and then feeding the crushed products into a pre-screening machine through a one-way rubber belt conveyor;

wherein the particle size of the oversize material of the soil removal sieve is larger than 10mm, and the particle size of the undersize material of the soil removal sieve is smaller than 10mm;

3) Materials entering a pre-screening device are sorted into a first-layer screen material loading part, a second-layer screen material loading part and a second-layer screen material unloading part according to different particle sizes, the first-layer screen material loading part enters a middle crushing buffer bin through a one-way rubber belt conveyor, the second-layer screen material loading part enters a fine crushing and shaping buffer bin through a one-way belt conveyor, and the second-layer screen material unloading part enters a shaping and sand making buffer bin through a one-way rubber belt conveyor;

suspension type de-ironing separators are installed on all the unidirectional rubber belt conveyors which pre-screen and convey materials outwards, and a suspension type electric vibration feeder is installed at the bottom of all the transfer buffer bins of the production line.

4) The medium crushing buffer bin discharges materials through an electric vibration feeder and feeds the materials to the medium crusher through a one-way rubber belt conveyor, the discharged materials of the medium crusher enter a grading sieve through the one-way rubber belt conveyor, the grading sieve separates the materials into oversize materials of the grading sieve and undersize materials of the grading sieve, the oversize materials of the grading sieve return to the medium crusher through the one-way rubber belt conveyor, and the undersize materials of the grading sieve enter the buffer bin for fine crushing and shaping through the one-way rubber belt conveyor;

5) The fine crushing and shaping buffer bin discharges materials through an electric vibration feeder and feeds the materials to a fine crushing and shaping machine through a one-way rubber belt conveyor, and the discharged materials of the fine crushing and shaping machine enter a coarse aggregate finished product sieve through the one-way rubber belt conveyor; the coarse aggregate finished product sieve sorts materials into a layer of sieve feeding materials, a layer of sieve feeding materials and a layer of sieve discharging materials according to different particle sizes, wherein the layer of sieve feeding materials enter a 20-31.5mm finished product aggregate bin, the layer of sieve feeding materials enter a 10-20mm finished product aggregate bin, the layer of sieve feeding materials enter a 4.75-10mm finished product aggregate bin, and the layer of sieve discharging materials enter a shaping sand making buffer bin through a one-way rubber belt conveyor;

wherein, the material feeding hopper on the first layer screen, the material feeding hopper on the second layer screen and the material feeding hopper on the third layer screen are communicated with a bidirectional rubber belt conveyor, one end of each bidirectional rubber belt conveyor is respectively connected with a 20-31.5mm finished aggregate, a 10-20mm finished aggregate and a 4.75-10mm finished aggregate bin, the other end of each bidirectional rubber belt conveyor is connected with the material feeding end of a buffer bin for fine crushing and shaping, rubber belt scales are respectively arranged on the three bidirectional rubber belt conveyors in the directions of the 20-31.5mm finished aggregate bin, the 10-20mm finished aggregate bin and the 4.75-10mm finished aggregate bin, the material outlets of the 20-31.5mm finished aggregate bin, the 10-20mm finished aggregate bin and the 4.75-10mm finished aggregate bin are opposite to the material feeding port of a container of a transfer truck, and an automobile electronic scale is arranged at the bottom of the transfer truck;

6) The buffer bin for shaping sand making discharges through an electric vibration feeder and feeds the materials to a shaping sand making machine through a one-way rubber belt conveyor, the shaping sand making machine discharges the materials into a fine aggregate finished product sieve through the one-way rubber belt conveyor, and the fine aggregate finished product sieve sorts the materials into first-layer sieve material, second-layer sieve material and second-layer sieve material according to different particle sizes; returning oversize materials of the first-layer sieve to a buffer bin for shaping and sand making through a one-way rubber belt conveyor, feeding oversize materials of the second-layer sieve into a finished aggregate bin or a grinding machine with the fineness modulus of 0-4.75mm, grinding the materials by the grinding machine, and then feeding the ground materials into a sand washing and fine sand recycling integrated machine, and feeding undersize materials of the second-layer sieve into the sand washing and fine sand recycling integrated machine through the one-way rubber belt conveyor;

7) Materials in the sand washing and fine sand recovery integrated machine are washed with sand and recovered with fine sand to obtain finished aggregates with fineness modulus of 0-4.75mm, and the method comprises the following steps: the sand washing and fine sand recovering integrated machine consists of a wheel bucket sand washing machine, a special fine sand recovering cyclone, a high-frequency vibration dewatering screen and a feeding pump, wherein the material entering the sand washing and fine sand recovering integrated machine is subjected to water leaching, the formed sand-containing slurry automatically flows into the wheel bucket sand washing machine to be scrubbed, the wheel bucket sand washing machine overflows into a pump pond below a screen of the dewatering screen, and is pumped to the special fine sand recovering cyclone through a slurry pump, and the sand with higher specific gravity centrifugally moves downwards along the outer ring of the separation space and is discharged through a sand settling port; discharging the mud with lower specific gravity from an upper overflow pipe; the settled sand product and coarse sand fished by a wheel bucket sand washer enter a high-frequency vibration dewatering screen together for dewatering, finally, wet sand containing certain moisture is stacked in a finished aggregate bin with a low fineness modulus of 0-4.75mm by adopting a one-way rubber belt conveyor, an overflow product is filtered by a filter press after being flocculated, concentrated and precipitated, overflow liquid of the concentrator and filtrate of the filter press enter a plant circulating water pool, and mud cakes are stacked in a temporary storage yard by adopting the one-way rubber belt conveyor.

The invention has the beneficial effects that:

1. in the sand making process, a combined sand making process combining vertical impact breaking and a grinding machine is adopted. The vertical impact breaking sand is mainly used, and the rod mill, the vertical mill and the like are used as auxiliary materials for adjusting, and the vertical impact breaking sand and the rod mill and the vertical mill complement each other. The vertical shaft impact crusher has the advantages of small volume, simple foundation and higher efficiency than a grinding machine, but has the defects of incomplete sand making, larger circulation amount in the process, larger fineness modulus of finished sand, thicker particles, easy generation of more coarse sand and stone powder and less intermediate-level particles; the sand making by the grinder is easy to adjust and has stable quality, but has the defects of low yield, large investment and high energy consumption. Experimental tests and application prove that the finished sand is formed by mixing three parts, namely vertical impact crushed sand, ground sand of a grinding machine and powder and sand removed by a part of inspection sieve with the particle size of less than 3mm, the grading is most reasonable, and the fineness modulus is more appropriate.

2. Adopt novel washed-out fine sand to retrieve all-in-one as washed-out fine sand recovery unit. The fine aggregate finished product sieve residue and the ground finished aggregate with the high fineness modulus of 0-4.75mm contain a large amount of stone powder, and the finished aggregate with the low fineness modulus can be obtained with higher yield through sand washing and fine sand recovery. The machine-made sand-containing slurry automatically flows into a wheel bucket sand washer to be scrubbed, the overflow of the sand washer enters a pump pool under a dewatering screen, and is pumped to a cyclone through a slurry pump, and fluid does centrifugal motion in the cyclone under certain feeding pressure. Due to the action of the centrifugal force field, fine sand particles in the fluid are accelerated to settle, and the separation process is strengthened. The sand with larger specific gravity centrifugally moves downwards along the outer ring of the separation space and is discharged through a sand setting port; the mud with lower specific gravity is discharged from the upper overflow pipe. And (4) enabling the sand setting product and coarse sand fished by the wheel bucket sand washer to enter a high-frequency vibration dewatering screen together for dewatering to form a sand mulling product. And (4) concentrating the overflow product by a concentration tank, pumping to a filter press, and allowing the overflow liquid of the concentrator and the filtrate of the filter press to enter a plant circulating water tank for recycling without discharging. The water requirement in the process is small, the water can be recycled, and the generated mud cake can be used as a raw material of a brick making factory.

Drawings

FIG. 1 is a flow chart of the production process of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The invention comprises a production line for preparing sand by a rock waste high-yield preparation machine, wherein the production line comprises equipment and accessories such as a raw material bin, a feeding machine, a coarse crusher, a desilting sieve, a mud pile, a pre-sieve, a medium crusher, a classifying sieve, a fine crushing and shaping machine, a finished product sieve, a finished product aggregate bin, a shaping sand making machine, a classifying sieve, a grinding machine, a sand washing and fine sand recycling integrated machine, a sewage concentrator, a compressor, various conveyors, dust collecting gas pipes and the like.

A method for preparing sand by utilizing a rock waste high-yield preparation machine adopts the production line, and comprises the following steps:

1) Coarse crushing and soil (mud) removing

The mined ore is transported to a raw material bin through a dump truck, and then the ore is fed into a coarse crusher or a soil removal screen by adopting a feeder. The feeding machine is preferably a bar vibrating feeding machine, a chute at the lower part of the feeding machine is provided with a flap valve, and whether the feeding machine enters the soil removing operation or not is flexibly adjusted according to the soil content of the raw ore mining; the distance between the bars is adjusted between 150mm and 200mm. The materials larger than the bar spacing enter the coarse crusher through the one-way rubber belt conveyor to be coarsely crushed, and the undersize materials smaller than the bar spacing enter the one-way rubber belt conveyor through the chute with the flap valve to be fed into the soil removing sieve. The coarse crusher is preferably a jaw crusher. The soil removing sieve is preferably a vibrating sieve, the sieve mesh is 10mm, materials on the sieve with the size larger than 10mm are fed into the pre-sieve through the one-way rubber belt conveyor, and the materials with the size smaller than 10mm are transported to a mine waste dump for storage as waste soil. If the soil removing operation is not needed, the materials of the bar vibrating feeder, which are smaller than the bar distance, are directly discharged with the jaw crusher and enter the prescreening screen.

2) Prescreening

The materials enter the pre-screening device through a discharge port of the coarse crusher and a one-way rubber belt conveyor. The pre-screening is preferably a double-layer circular vibration pre-screening, the material feeding and discharging of the one-layer screen enters a middle-crushing buffering bin through a one-way belt conveyor, the material feeding and discharging of the two-layer screen enters a buffering bin for fine crushing and shaping through a one-way belt conveyor, and the material remaining on the two-layer screen enters the buffering bin for shaping and sand making through the one-way belt conveyor. In addition, a suspension type iron remover is installed on each one-way rubber belt conveyor which conveys materials outwards from the circular vibration pre-screening, and a suspension type electric vibration feeder is installed at the bottom of all transfer buffer bins of the production line.

3) Middle broken piece

The middle crushing buffer bin discharges materials through the electric vibration feeder and feeds materials to the middle crusher through the one-way rubber belt conveyor. The medium crusher is preferably a single/multi-cylinder hydraulic cone crusher. The discharge of the middle crusher enters the grading sieve through a one-way rubber belt conveyor. The grading sieve is preferably a circular vibration grading sieve. The material on the grading sieve returns to the middle crusher through the one-way rubber belt conveyor, and the material on the grading sieve enters the buffer bin for fine crushing and shaping through the one-way rubber belt conveyor.

4) Finely crushing and shaping

The fine crushing and shaping buffer bin discharges materials through the electric vibration feeder and feeds the materials to the fine crushing and shaping machine through the one-way rubber belt conveyor. The fine crushing shaper is preferably a vertical shaft impact crushing shaper. The discharged material of the shaping machine enters a coarse aggregate finished product sieve through a one-way rubber belt conveyor.

5) Coarse aggregate screening

The discharge of the fine crushing and shaping machine enters a coarse aggregate finished product sieve through a one-way rubber belt conveyor. The finished product sieve is preferably a three-layer triaxial elliptical horizontal vibrating sieve, one to three-layer sieve oversize discharge hoppers are communicated with a bidirectional rubber belt conveyor, one end of each of the three-layer sieve oversize discharge hoppers is respectively connected with 20-31.5mm, 10-20mm and 4.75-10mm finished product aggregate bins, the other end of each of the three-layer sieve oversize discharge hoppers is connected with the feeding end of a fine crushing and shaping buffer bin, and the three-layer sieve oversize discharge hoppers are connected with the shaping buffer bin through the communication of a one-way rubber belt conveyor. In addition, the three bidirectional rubber belt conveyors are respectively provided with a rubber belt scale in the directions of a finished product aggregate bin with the thickness of 20-31.5mm, a finished product aggregate bin with the thickness of 10-20mm and a finished product aggregate bin with the thickness of 4.75-10mm, the discharge ports of the finished product aggregate bin with the thickness of 20-31.5mm, the finished product aggregate bin with the thickness of 10-20mm and the finished product aggregate bin with the thickness of 4.75-10mm are opposite to the feed port of a container of the transfer truck, and the bottom of the transfer truck is provided with an automobile electronic scale.

6) Shaping sand making

The shaping sand making process is mainly completed in a sand making building. The sand making building comprises a buffer bin for shaping and making sand, a shaping and sand making machine, a fine aggregate finished product sieve, a grinding machine, a sand washing and fine sand recycling all-in-one machine and a transmission device. The shaping sand making buffer bin discharges materials through the electric vibration feeder and feeds materials to the shaping sand making machine through the one-way rubber belt conveyor. The vertical shaft impact sand breaking and making machine is preferably selected for the shaping sand making machine. The discharging of the sand making machine enters a fine aggregate finished product sieve through a one-way rubber belt conveyor. The fine aggregate finished product sieve is preferably a double-layer triaxial elliptical horizontal vibrating sieve, oversize materials on one layer of the sieve are returned to a buffering bin for shaping and sand making through a one-way rubber belt conveyor, an oversize material discharge hopper on the two layer sieve is communicated with a two-way rubber belt conveyor, one end of the oversize material discharge hopper is connected with a finished aggregate bin with the high fineness modulus of 0-4.75mm, the other end of the oversize material discharge hopper is connected with the feed end of a grinding machine, and oversize materials on the two layer sieve are discharged and enter a sand washing and fine sand recycling integrated machine through the one-way rubber belt conveyor. The discharge hopper of the grinding machine is connected with the sand washing and fine sand recovery all-in-one machine through a one-way rubber belt conveyor. The mill is preferably a rod mill or a vertical mill. In addition, the rubber belt conveyors for conveying finished products in the sand building are all provided with rubber belt scales, a finished product aggregate bin with the high fineness modulus of 0-4.75mm is opposite to a container feeding port of the transfer truck, and the bottom of the transfer truck is provided with an automobile electronic scale.

7) Washed-out fine sand recovery

The sand washing fine sand recycling machine is preferably a novel sand washing fine sand recycling all-in-one machine and consists of a wheel bucket sand washing machine, a special fine sand recycling cyclone, a high-frequency vibration dewatering screen and a feeding pump. And (3) leaching the machine-made sand by water, enabling the formed sand-containing slurry to automatically flow into a wheel bucket sand washer for scrubbing, enabling the overflow of the sand washer to enter a pump pool under a dewatering screen, and pumping the sand-containing slurry to a swirler by a slurry pump. The sand with larger specific gravity centrifugally moves downwards along the outer ring of the separation space and is discharged through a sand setting port; the mud with lower specific gravity is discharged from the upper overflow pipe. The settled sand product and the coarse sand fished by the wheel bucket sand washer enter a high-frequency vibration dewatering screen together for dewatering, and finally, wet sand containing certain moisture is stacked in a finished aggregate bin with the low fineness modulus of 0-4.75mm by adopting a one-way rubber belt conveyor. And (4) filtering the overflow product by using a filter press after flocculation concentration and precipitation, and allowing the overflow liquid of the thickener and filtrate of the filter press to enter a plant circulating water tank. The mud cakes are piled up in a temporary storage yard by adopting a one-way rubber belt conveyor.

Claims (8)

1. A method for preparing sand by utilizing a rock waste high-yield preparation machine is characterized by comprising the following steps:

1) The feeding machine receives the ore, the ore is separated into feeding machine oversize products and feeding machine undersize products according to different particle sizes, the feeding machine oversize products enter the coarse crusher through the one-way rubber belt conveyor to be coarsely crushed, and the feeding machine undersize products enter the soil removal sieve through the one-way rubber belt conveyor;

2) The soil removing screen separates undersize of the feeding machine into oversize and undersize of the soil removing screen according to different particle sizes, the oversize of the soil removing screen enters a pre-screen through a one-way rubber belt conveyor, and the undersize of the soil removing screen is transported to a mine waste dump for storage as waste soil;

coarse crushing the oversize products of the feeder by a coarse crusher, and then feeding the crushed products into a pre-screening machine through a one-way rubber belt conveyor;

3) Materials entering a pre-screening device are sorted into a first-layer screen feeding material, a second-layer screen feeding material and a second-layer screen discharging material according to different particle sizes, the first-layer screen feeding material enters a middle-crushing buffer bin through a one-way rubber belt conveyor, the second-layer screen feeding material enters a buffer bin for fine crushing and shaping through a one-way belt conveyor, and the second-layer screen discharging material enters a buffer bin for shaping and sand making through a one-way rubber belt conveyor;

4) The medium crushing buffer bin discharges materials through an electric vibration feeder and feeds the materials to a medium crusher through a one-way rubber belt conveyor, the discharged materials of the medium crusher enter a grading sieve through the one-way rubber belt conveyor, the grading sieve separates the materials into oversize materials of the grading sieve and undersize materials of the grading sieve, the oversize materials of the grading sieve return to the medium crusher through the one-way rubber belt conveyor, and the undersize materials of the grading sieve enter the buffer bin for fine crushing and shaping through the one-way rubber belt conveyor;

5) The fine crushing and shaping buffer bin discharges materials through an electric vibration feeder and feeds the materials to a fine crushing and shaping machine through a one-way rubber belt conveyor, the fine crushing and shaping machine discharges materials through the one-way rubber belt conveyor and enters a coarse aggregate finished product sieve, the coarse aggregate finished product sieve separates the materials into a first-layer sieve material, a second-layer sieve material, a third-layer sieve material and a third-layer sieve material according to different particle sizes, the first-layer sieve material enters a 20-31.5mm finished product aggregate bin, the second-layer sieve material enters a 10-20mm finished product aggregate bin, the third-layer sieve material enters a 4.75-10mm finished product aggregate bin, and the third-layer sieve material enters a shaping sand making buffer bin through the one-way rubber belt conveyor;

6) The buffer bin for shaping and sand making discharges through an electric vibration feeder and feeds the materials to a shaping and sand making machine through a one-way rubber belt conveyor, the discharged materials of the shaping and sand making machine enter a fine aggregate finished product sieve through the one-way rubber belt conveyor, and the fine aggregate finished product sieve sorts the materials into a first-layer sieve material, a second-layer sieve material and a second-layer sieve material according to different particle sizes;

feeding the material on the first-layer sieve back to a buffer bin for shaping and sand making through a one-way rubber belt conveyor, feeding the material on the second-layer sieve into a finished aggregate bin or a grinding machine with the high fineness modulus of 0-4.75mm, grinding the material by the grinding machine, feeding the ground material into a sand washing and fine sand recycling integrated machine, and feeding the material on the second-layer sieve into the sand washing and fine sand recycling integrated machine through the one-way rubber belt conveyor; 7) And (3) washing sand and recovering fine sand from the materials in the sand washing and fine sand recovering integrated machine to obtain finished aggregate with the fineness modulus of 0-4.75 mm.

2. The method for preparing the sand by the rock waste high-yield preparation machine according to the claim 1, wherein in the step 1), the particle size of the oversize material of the feeding machine is more than 200mm, and the particle size of the undersize material of the feeding machine is less than 200mm.

3. The method for preparing sand by using rock wastes in a high-yield machine according to claim 1, characterized in that in the step 1), the particle size of oversize products of the feeding machine is more than 150mm, and the particle size of undersize products of the feeding machine is less than 150mm.

4. The method for preparing sand by using rock waste in a high-yield preparation machine as claimed in claim 1, wherein in the step 2), the particle size of the oversize of the earth removing sieve is more than 10mm, and the particle size of the undersize of the earth removing sieve is less than 10mm.

5. The method as claimed in claim 1, wherein in step 3), each unidirectional tape conveyor that is used to transport materials in advance and sieve outwards is equipped with a suspended iron remover, and the bottoms of all the transfer buffer bins of the production line are equipped with a suspended electric vibration feeder.

6. The method as claimed in claim 1, wherein in step 5), the hopper for feeding the first layer screen, the second layer screen and the third layer screen is connected to a bidirectional belt conveyor, one end of the hopper is connected to the 20-31.5mm finished aggregate bin, the 10-20mm finished aggregate bin and the 4.75-10mm finished aggregate bin, and the other end of the hopper is connected to the feeding end of the buffer bin for fine crushing and shaping.

7. The method as claimed in claim 6, wherein the three bi-directional belt conveyors are respectively provided with a belt scale in the directions of the 20-31.5mm finished product silo, the 10-20mm finished product silo and the 4.75-10mm finished product silo, the 20-31.5mm finished product silo, the 10-20mm finished product silo and the 4.75-10mm finished product silo are opposite to the feeding port of the container of the transfer truck, and the bottom of the transfer truck is provided with an electronic scale.

8. The method for preparing sand by utilizing rock wastes in a high-yield manner according to claim 1, wherein the step 7) comprises the following steps: the sand washing and fine sand recycling integrated machine consists of a bucket wheel sand washing machine, a special fine sand recycling cyclone, a high-frequency vibration dewatering screen and a feeding pump, wherein materials entering the sand washing and fine sand recycling integrated machine are subjected to water leaching, formed sand-containing slurry automatically flows into the bucket wheel sand washing machine to be scrubbed, the bucket wheel sand washing machine overflows into a pump pond below a screen of the dewatering screen, and is pumped to the special fine sand recycling cyclone through a slurry pump, and sand with high specific gravity centrifugally moves downwards along the outer ring of the sorting space and is discharged through a sand setting port; discharging the mud with lower specific gravity from an upper overflow pipe; the settled sand product and coarse sand fished by a wheel bucket sand washer enter a high-frequency vibration dewatering screen together for dewatering, finally, wet sand containing certain moisture is stacked in a finished aggregate bin with a low fineness modulus of 0-4.75mm by adopting a one-way rubber belt conveyor, an overflow product is filtered by a filter press after being flocculated, concentrated and precipitated, overflow liquid of the concentrator and filtrate of the filter press enter a plant circulating water pool, and mud cakes are stacked in a temporary storage yard by adopting the one-way rubber belt conveyor.

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