CN110215999B - Short-flow machine-made sandstone process - Google Patents
Short-flow machine-made sandstone process Download PDFInfo
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- CN110215999B CN110215999B CN201910529135.XA CN201910529135A CN110215999B CN 110215999 B CN110215999 B CN 110215999B CN 201910529135 A CN201910529135 A CN 201910529135A CN 110215999 B CN110215999 B CN 110215999B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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Abstract
A short-flow machine-made sand and stone process relates to the field of sand and stone production processes, in particular to a machine-made sand and stone production process. The invention aims to solve the problems of long crushing process, more used equipment, more maintenance personnel and easy dust generation in the existing machine-made sandstone production process, thereby causing environmental pollution. The method comprises the following steps: the method comprises the following steps: a crushing process; step two: grinding and shaping; step three: a first screening process; step four: a circulating procedure; step five: and (5) a second screening process. The method has the advantages that the process flow is short, 1-2 times of crushing is reduced compared with the traditional flow, the number of used equipment is reduced by more than 30% compared with the traditional flow, the problem of labor cost is solved, and maintenance personnel can be reduced by more than 40%; compared with the traditional process, the invention can reduce dust and is more environment-friendly. The invention is suitable for machine-made sand.
Description
Technical Field
The invention relates to the field of sandstone production processes, in particular to a machine-made sandstone production process.
Background
The machine-made sand is sand processed by the sand making machine and other accessory equipment, the finished product is more regular, and the sand can be processed into sand with different rules and sizes according to different process requirements, so that the daily requirement can be better met. The machine-made sand production line is formed by combining equipment such as a vibrating feeder, a jaw crusher, a sand making machine, a vibrating screen, a rubber belt conveyor and the like. According to different process requirements, equipment of various types are combined to meet different process requirements of customers. Firstly, primarily crushing stone materials by a coarse crusher, then conveying the generated coarse materials to a fine crusher by a rubber belt conveyor for further crushing, screening the finely crushed stone materials by a vibrating screen to obtain two kinds of stones, carrying out sand making by a stone sand making machine which meets the feeding granularity of the sand making machine, and feeding the other part of the stones back to a fine slope. One part of stones of the sand making machine is made into sand, the sand is made into finished sand after being washed by a sand washing machine (optional), and the other part of the stones of the sand making machine is broken again. At present, the traditional machine-made sandstone production process needs 3-4 times of crushing, the crushing process is long, the used equipment is more, the number of maintenance personnel is more, and the defects of environmental pollution caused by dust are obvious.
Disclosure of Invention
The invention aims to solve the problems of long crushing process, more used equipment, more maintenance personnel and easy dust generation to cause environmental pollution in the existing machine-made sandstone production process, and provides a short-process machine-made sandstone process.
A short-flow mechanical sand and stone process is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
Further, the crusher in the first step is one or more selected from a gyratory crusher, a jaw crusher, a hammer crusher and an impact crusher.
Further, the granularity of the ore a in the step one is less than or equal to 350 mm.
Further, the stone crusher in the second step is selected from one or two of a semi-autogenous mill and an autogenous mill.
Further, in the second step, the ore a obtained in the first step is mixed with water, and the mass ratio of the ore a to the water is 1 (0.65-0.95).
Furthermore, the granularity of the ore in the mixture b in the step two is less than or equal to 150 mm.
Further, the screening equipment in the third step is a screen, and the screen is selected from one or two of a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 25 mm-90 mm, and the aperture of the lower layer screen of the sieve is 5 mm-75 mm.
Further, the screening equipment in the fourth step is a screen, and the screen is selected from one or two of a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 25 mm-90 mm, and the aperture of the lower layer screen of the sieve is 5 mm-75 mm.
Further, in the fourth step, the product c1 obtained in the third step is mixed with water, and the mass ratio of the product c1 to the water is 1 (0.65-0.95); the particle size of the ore in the mixture e is less than or equal to that of the product c 2.
Further, the screening equipment in the fifth step is a screen, and the screen is selected from one or two of a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 0.5 mm-50 mm, and the aperture of the lower layer screen of the sieve is 0.03 mm-37.5 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the process flow is short, and 1-2 times of crushing is reduced compared with the traditional flow;
(2) the equipment used in the invention is less, and the equipment quantity is less than 30% of that of the traditional process;
(3) the invention solves the problem of labor cost, and the maintenance personnel can be reduced by more than 40%;
(4) compared with the traditional process, the invention can reduce dust and is more environment-friendly.
The invention is suitable for machine-made sand.
Detailed Description
The first embodiment is as follows: the embodiment is a short-flow machine-made sandstone process, which is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
Compared with the prior art, the beneficial effects of this embodiment are:
(1) the process flow of the embodiment is short, and 1-2 times of crushing is reduced compared with the traditional process;
(2) the number of the used equipment is less, and is less than that of the traditional process by more than 30 percent;
(3) the embodiment solves the problem of labor cost, and maintenance personnel can be reduced by more than 40%;
(4) compared with the traditional process, the method can reduce dust and is more environment-friendly.
This embodiment is suitable for machine-made sandstone.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the crusher in the step one is selected from one or more of a gyratory crusher, a jaw crusher, a hammer crusher and a counterattack crusher. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the granularity of the ore a in the step one is less than or equal to 350 mm. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: the stone crusher in the second step is selected from one or two of a semi-autogenous mill and an autogenous mill. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: and step two, mixing the ore a obtained in the step one with water, wherein the mass ratio of the ore a to the water is 1 (0.65-0.95). The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: the granularity of the ore in the mixture b in the step two is less than or equal to 150 mm. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the screening equipment in the third step is a screen, and the screen is selected from one or two of a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 25 mm-90 mm, the aperture of the lower layer screen of the sieve is 5 mm-75 mm, and the aperture of the upper layer screen is larger than that of the lower layer screen. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the screening equipment in the fourth step is a screen, and the screen is one or two selected from a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 25 mm-90 mm, the aperture of the lower layer screen of the sieve is 5 mm-75 mm, and the aperture of the upper layer screen is larger than that of the lower layer screen. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: in the fourth step, the product c1 obtained in the third step is mixed with water, and the mass ratio of the product c1 to the water is 1 (0.65-0.95); the particle size of the ore in the mixture e is less than or equal to that of the product c 2. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: the screening equipment in the fifth step is a screen, and the screen is one or two selected from a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 0.5 mm-50 mm, the aperture of the lower layer screen of the sieve is 0.03 mm-37.5 mm, and the aperture of the upper layer screen is larger than that of the lower layer screen. The other steps are the same as those in the first to ninth embodiments.
The present invention will be described in further detail with reference to specific examples.
The first embodiment is as follows: a short-flow mechanical sand and stone process is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
the crusher in the step one is selected from a gyratory crusher;
the granularity of the ore a in the step one is less than or equal to 300 mm;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
the stone crushing and shaping machine in the step two is selected from a semi-autogenous mill;
mixing the ore a obtained in the step one with water in a mass ratio of 1: 0.85;
the granularity of the ore in the mixture b in the step two is less than or equal to 70 mm;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the screening equipment in the third step is a screen, and the screen is selected from a linear screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 37.5mm, and the aperture of the lower layer screen of the sieve is 19 mm;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the screening equipment in the fourth step is a screen, and the screen is selected from a linear screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 37.5mm, and the aperture of the lower layer screen of the sieve is 19 mm;
in the fourth step, the product c1 obtained in the third step is mixed with water, and the mass ratio of the product c1 to the water is 1: 0.85; the granularity of the ore in the mixture e is less than or equal to that of the product c 2;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the screening equipment in the fifth step is a screen, and the screen is selected from a linear screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 5m, and the aperture of the lower layer screen of the sieve is 0.074 mm;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
In the first embodiment, four products are obtained, wherein the particle size of the product d2 is 0.074-5 mm, the particle size of the product d1 is 5-19 mm, the particle size of the product c2 is 19-37.5 mm, and the particle size of the product d3 is less than 0.074 mm.
Example two: a short-flow mechanical sand and stone process is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
the crusher in the step one is selected from a gyratory crusher;
the granularity of the ore a in the first step is less than or equal to 250 mm;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
the crushed stone shaper in the second step is an autogenous mill;
in the second step, the ore a obtained in the first step is mixed with water, and the mass ratio of the ore a to the water is 1: 0.78;
the granularity of the ore in the mixture b in the step two is less than or equal to 60 mm;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the screening equipment in the third step is a circular vibrating screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 31.5mm, and the aperture of the lower layer screen of the sieve is 9.5 mm;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the screening equipment in the fourth step is a circular vibrating screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 31.5mm, and the aperture of the lower layer screen of the sieve is 9.5 mm;
in the fourth step, the product c1 obtained in the third step is mixed with water, and the mass ratio of the product c1 to the water is 1: 0.78; the granularity of the ore in the mixture e is less than or equal to that of the product c 2;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the screening equipment in the fifth step is a circular vibrating screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 5mm, and the aperture of the lower layer screen of the sieve is 0.074 mm;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
The second embodiment obtains four products, wherein the particle size of the product d2 is 0.074-5 mm, the particle size of the product d1 is 5-9.5 mm, the particle size of the product c2 is 9.5-31.5 mm, and the particle size of the product d3 is less than 0.074 mm.
Example three: a short-flow mechanical sand and stone process is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
the crusher in the step one is selected from a gyratory crusher;
the granularity of the ore a in the step one is less than or equal to 330 mm;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
the crushed stone shaper in the second step is an autogenous mill;
mixing the ore a obtained in the step one with water in a mass ratio of 1: 0.85;
the granularity of the ore in the mixture b in the step two is less than or equal to 70 mm;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the screening equipment in the third step is a screen selected from a resonance screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 63mm, and the aperture of the lower layer screen of the sieve is 26.5 mm;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the screening equipment in the fourth step is a screen, and the screen is selected from a resonance screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 63mm, and the aperture of the lower layer screen of the sieve is 26.5 mm;
in the fourth step, the product c1 obtained in the third step is mixed with water, and the mass ratio of the product c1 to the water is 1: 0.85; the granularity of the ore in the mixture e is less than or equal to that of the product c 2;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the screening equipment in the step five is a resonance screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 5mm, and the aperture of the lower layer screen of the sieve is 0.15 mm;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
In the third embodiment, four products are obtained, wherein the particle size of the product d2 is 0.15-5 mm, the particle size of the product d1 is 5-26.5 mm, the particle size of the product c2 is 26.5-63 mm, and the particle size of the product d3 is less than 0.15 mm.
Example four: a short-flow mechanical sand and stone process is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
the crusher in the step one is selected from a gyratory crusher;
the granularity of the ore a in the step one is less than or equal to 200 mm;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
the crushed stone shaper in the second step is an autogenous mill;
mixing the ore a obtained in the step one with water in a mass ratio of 1: 0.85;
the granularity of the ore in the mixture b in the step two is less than or equal to 60 mm;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the screening equipment in the third step is a screen selected from a resonance screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 20mm, and the aperture of the lower layer screen of the sieve is 10 mm;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the screening equipment in the fourth step is a screen, and the screen is selected from a resonance screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 20mm, and the aperture of the lower layer screen of the sieve is 10 mm;
in the fourth step, the product c1 obtained in the third step is mixed with water, and the mass ratio of the product c1 to the water is 1: 0.85; the granularity of the ore in the mixture e is less than or equal to that of the product c 2;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the screening equipment in the step five is a screen, and the screen is selected from a resonance screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 4mm, and the aperture of the lower layer screen of the sieve is 0.074 mm;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
And four products are obtained in the fourth embodiment, wherein the particle size of the product d2 is 0.074-4 mm, the particle size of the product d1 is 4-10 mm, the particle size of the product c2 is 10-20 mm, and the particle size of the product d3 is less than 0.074 mm.
Claims (10)
1. A short-flow mechanical sand and stone process is characterized in that the short-flow mechanical sand and stone process is completed according to the following steps:
the method comprises the following steps: a crushing procedure:
crushing the ore by a crusher to obtain ore a;
step two: grinding and shaping:
mixing the ore a obtained in the step one with water, and then passing through a broken stone shaper to obtain a mixture b;
step three: a first screening process:
screening the mixture b obtained in the second step by using a screening device to obtain a product c1, a product c2 and a product c 3;
the particle size of the product c1 > the particle size of the product c2 > the particle size of the product c3 in step three;
step four: and (3) a circulating process:
mixing the product c1 obtained in the step three with water, and then passing through a broken stone shaper to obtain a mixture e; screening the mixture e by using screening equipment to obtain a product c2 and a product c 3;
the particle size of the product c2 > the particle size of the product c3 described in step four;
step five: a second screening process:
mixing the product c3 obtained in the step three and the product c3 obtained in the step four by using a screening device, and then carrying out secondary screening to obtain a product d1, a product d2 and a product d 3;
the particle size of the product d1 > the particle size of the product d2 > the particle size of the product d3 in step five.
2. The short-run machine-made sand and stone process according to claim 1, wherein the crusher in the first step is one or more selected from the group consisting of a gyratory crusher, a jaw crusher, a hammer crusher and a counterattack crusher.
3. The short-flow mechanical sand and stone process according to claim 1, wherein the particle size of ore a in step one is less than or equal to 350 mm.
4. The short-flow mechanical sand and stone process according to claim 1, wherein the stone crusher in step two is selected from one or two of a semi-autogenous mill and an autogenous mill.
5. The short-flow mechanical sand and stone process according to claim 1, characterized in that the ore a obtained in the step one is mixed with water in the step two, and the mass ratio of the ore a to the water is 1 (0.65-0.95).
6. The short-run mechanical sand and stone process as claimed in claim 1, wherein the size of the ore in the mixture b in step two is less than or equal to 150 mm.
7. The short-process mechanical sand and stone process according to claim 1, wherein the screening device in step three is a screen selected from one or two of a linear screen, a circular vibrating screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 25 mm-90 mm, the aperture of the lower layer screen of the sieve is 5 mm-75 mm, and the aperture of the upper layer screen is larger than that of the lower layer screen.
8. The short-process machine-made sandstone process of claim 1, wherein the screening device in step four is a screen selected from one or two of a linear screen, a circular vibrating screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 25 mm-90 mm, the aperture of the lower layer screen of the sieve is 5 mm-75 mm, and the aperture of the upper layer screen is larger than that of the lower layer screen.
9. The short-flow mechanical sand and stone process according to claim 1, characterized in that the product c1 obtained in the third step is mixed with water in the fourth step, and the mass ratio of the product c1 to the water is 1 (0.65-0.95); the particle size of the ore in the mixture e is less than or equal to that of the product c 2.
10. The short-flow mechanical sand and stone process according to claim 1, wherein the screening device in the fifth step is a screen, and the screen is one or two selected from a linear screen, a circular vibration screen, a resonance screen and a probability screen; the sieve is provided with a double-layer screen, the aperture of the upper layer screen of the sieve is 0.5 mm-50 mm, the aperture of the lower layer screen of the sieve is 0.03 mm-37.5 mm, and the aperture of the upper layer screen is larger than that of the lower layer screen.
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