CN113385286A

CN113385286A - Sand and powder refining treatment process and system in dry production of sandstone

Info

Publication number: CN113385286A
Application number: CN202110872088.6A
Authority: CN
Inventors: 巢德明; 程军辉; 蒋已禄; 刘福余; 熊顺
Original assignee: Chongqing Fuling Daye Building Materials Co Ltd
Current assignee: Chongqing Fuling Daye Building Materials Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-09-14
Anticipated expiration: 2041-07-30
Also published as: CN113385286B

Abstract

The invention discloses a sand and powder refining treatment process and a system in dry production of sandstone, belonging to the field of sandstone processing, wherein the process flow comprises the following steps: s1: first-stage crushing; s2: screening; sending the sand powder into a primary winnowing machine, and sending the sand and stone into a sand and stone production line; s3: sending the fine sand powder selected by the primary winnowing machine into a dryer, and simultaneously blending the coarse sand powder to a corresponding sand production link in a quantitative manner according to the powder content requirements of different sand materials in a sand production line; s4: controlling the water content and sending the water content into a secondary winnowing machine; s5: selecting superfine sand by a secondary winnowing machine, and feeding the rest sand powder into a tertiary winnowing machine; s6: fine stone powder and common stone powder are separated by a three-stage winnowing machine. The effect is as follows: the silt and the stone powder in the sandstone production raw materials can be effectively removed, and a proper amount of stone powder is added for mixing according to the requirements of the grade and the powder content of the sandstone, so that the powder content of the sandstone is ensured to meet the standard range; can realize the grading production of fine stone powder, common stone powder and ultrafine sand.

Description

Sand and powder refining treatment process and system in dry production of sandstone

Technical Field

The invention relates to a sand production technology, in particular to a sand and powder refining treatment process and a system in sand dry production.

Background

Along with the development of socioeconomic, the demand of building materials is increasing, and the demand of people on the processing technology of the sandstone, which is an important component of the building materials, is also increasing.

The existing sand processing is generally divided into wet processing and dry processing, wherein the wet processing is generally realized by adopting water washing in the material screening and crushing processes and matching with a stone washer and a sand washer to carry out washing operation on coarse and fine aggregates, so that the powder content in the sand is ensured. Although the dust pollution is less, the water consumption is large, and the fine sand powder loss is serious.

The technological process of the whole production line processed by the dry method basically does not use water, and although the loss of the stone powder is small, the powder content of the finished sand generally exceeds the standard.

Disclosure of Invention

Aiming at the problems, the invention firstly provides a sand and powder refining treatment process in dry production of sandstone, which can effectively ensure the loss of stone powder in the processing of the sandstone, realize refined grading application of the stone powder in the processing of the sandstone without adding grinding equipment, effectively ensure the powder content in finished sand and improve the quality of the finished sand.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a process for refining and refining sand and powder in dry production of sandstone is characterized by comprising the following steps:

s1: obtaining sandstone raw materials from a mine, and performing primary crushing to enable the particle size of the sandstone raw materials to be within a first preset range;

s2: screening the crushed sand in the step S1; sending the sand powder with the particle size within the second preset range into a primary winnowing machine, and sending the sand and stone with the particle size within the third preset range into a sand and stone production line;

s3: sending the fine sand powder selected by the primary air separator into a dryer, and simultaneously blending the coarse sand powder selected by the primary air separator into a corresponding sand production link in a quantitative manner according to the powder content requirements of different sand materials in a sand production line;

s4: controlling the water content of the fine sand powder within a fourth preset range by using a dryer, and sending the fine sand powder into a secondary winnowing machine;

s5: superfine sand with the grain diameter within a fifth preset range is selected by a secondary air separator, and the rest sand powder is sent into a tertiary air separator;

s6: fine stone powder with the grain size of more than 325 meshes and common stone powder with the grain size of less than 325 meshes are separated by a three-stage winnowing machine.

Optionally, the grain size obtained by the primary crushing in the step S1 is less than or equal to 120mm, the grain size is conveyed to the primary air separator through belt conveying equipment, and sand powder with the grain size of 0-3 mm is conveyed to the primary air separator in the step S2; sending sand and stone with the thickness of 3-28 mm into a sand and stone production line; and (3) conveying the sand with the diameter of more than 28mm into secondary crushing equipment, and sieving according to the standard after secondary crushing.

Optionally, in the step S3, the primary air classifier quantitatively blends coarse sand powder with a particle size of 0.6-3 mm to the corresponding sand production link, the rest fine sand powder is sent to the dryer to remove excess moisture, and in the step S4, the dryer is used to control the moisture content of the fine sand powder to be within a range of less than 1%.

Optionally, in step S5, the secondary air separator selects superfine sand with a particle size of 0.075-0.6 mm, and the rest is sent to the tertiary air separator; and (S6) selecting stone powder with the particle size of 0.045-0.075 mm as common stone powder by using a three-stage winnowing machine, and outputting the rest of sand powder as superfine sand.

Optionally, dust collecting equipment is further arranged in the sand production line and used for collecting 0-0.6 mm sand powder and sending the sand powder into the dryer.

Another objective of the present invention is to provide a system for refining sand and powder in dry sand production, which is used to implement the above process, and the key points of the system are as follows: the sand-gravel separator comprises a primary crushing device, a primary screening device, a primary winnowing machine, a dryer, a secondary winnowing machine, a tertiary winnowing machine device and a sand-gravel production line;

the primary screening device divides the sand and stone crushed by the primary crushing device into 0-3 mm of sand powder and 3-28 mm of sand and stone, wherein the 0-3 mm of sand powder is sent to the primary winnowing machine, and the 3-28 mm of sand and stone is sent to the sand and stone production line;

the primary winnowing machine is used for separating the fed sand powder into coarse sand powder with the particle size of 0.3-3 mm, and the coarse sand powder is quantitatively blended to a corresponding sand production link according to the requirements of the powder content of different sand materials in the sand production line; and the rest fine sand powder is sent into the dryer to remove redundant moisture, fine stone powder with the particle size within the range of 0-0.045 mm is firstly separated by the secondary winnowing machine, and fine stone powder with the particle size within the range of 0-0.045 mm and common stone powder with the particle size within the range of 0.045-0.075 mm are separated by the tertiary winnowing machine.

Optionally, the secondary winnowing machine comprises a primary material distribution cone (001) and a secondary material distribution cone (002), a central blanking pipe (003) is arranged in the primary material distribution cone (001), a central rotating shaft (004) is sleeved in the central blanking pipe (003), the upper end of the central rotating shaft (004) extends upwards and is connected with a driving device (005), the lower end of the central rotating shaft extends out of a blanking port of the central blanking pipe (003) and is connected with a material scattering disc (006), an air inlet pipe (007) is arranged at the lower end of the material scattering disc (006), the secondary material distribution cone (002) is positioned at the upper end of an inner cavity of the primary material distribution cone (001), a cavity between the primary material distribution cone (001) and the secondary material distribution cone (002) is communicated through an opening at the upper end of the secondary material distribution cone (002), and a cage-shaped rotor (008) is arranged in the secondary material distribution cone (002) opposite to the opening, the center of the cage-shaped rotor (008) is connected to the central rotating shaft (004), the upper end of the secondary material separating cone (002) is connected with a fine powder discharging pipe (009), and the fine powder discharging pipe (009) is annularly and uniformly connected with a plurality of cyclone powder collecting devices (010).

Optionally, the upper end of the central blanking pipe (003) is connected with an obliquely arranged feeding pipe (011), and the lower ends of the primary material dividing cone (001) and the secondary material dividing cone (002) are respectively and correspondingly connected with an obliquely arranged primary blanking pipe (012) and a secondary blanking pipe (013).

Optionally, the structure of the secondary air separator is the same as that of the tertiary air separator, the lower ends of a plurality of cyclone powder collectors (010) of the secondary air separator are communicated to a feeding pipe (011) of the tertiary air separator, and a primary discharging pipe (012) and a secondary discharging pipe (013) of the secondary air separator are connected in parallel to output ultrafine sand with the grain size within the range of 0.075-0.6 mm.

Optionally, the dryer comprises a feeding port (31), a drying drum (32) and a discharging port (33), the drying drum (32) is obliquely arranged according to a preset angle, and a rotating disc (34) and a power device (35) for driving the rotating disc (34) to rotate are connected to the outside of the drying drum (32); the drying cylinder (32) comprises an outer sleeve (321) and an inner sleeve (322), a plurality of flow deflectors (323) are uniformly distributed between the outer sleeve (321) and the inner sleeve (322), and the outer sleeve (321) is provided with a heating wire (324);

an exhaust pipe (36) is further connected to the discharge port (33), a cooler (37) and a dust removing device (38) are arranged on the exhaust pipe (36), and a water outlet (39) is further formed in the exhaust pipe (36) at the rear end of the cooler (37).

Compared with the prior art, the invention has the following remarkable effects:

(1) in the dry production process of the sandstone, firstly, the sand and the stone powder in the sandstone production raw materials are effectively removed through the matching of screening equipment and a primary winnowing machine, and then, according to the requirements of the grade and the powder content of the sandstone, a proper amount of stone powder is added for mixing after the sandstone is processed and molded, so that the powder content of the sandstone is ensured to be in accordance with the standard range;

(2) through drying and screening the collected stone powder, the grading production of fine stone powder, common stone powder and ultrafine sand with the particle size of more than 325 meshes can be effectively realized, the reasonable utilization of sand powder waste is realized, and the loss of the stone powder is reduced.

(3) The production of the stone powder does not need additional grinding equipment, and only needs to recycle the stone powder generated in the processing process of the sandstone, so that the ore raw materials are more fully utilized, and the economic benefit of sandstone manufacturers is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a process flow diagram provided by an embodiment of the present invention;

figure 2 is a schematic diagram of the structure of a secondary air classifier and a tertiary air classifier apparatus according to an embodiment of the present invention;

figure 3 is a top plan view of a secondary air classifier and a tertiary air classifier apparatus according to an embodiment of the present invention;

fig. 4 is a diagram illustrating the connection between the secondary air classifier and the tertiary air classifier in accordance with the present invention;

FIG. 5 is a view showing the connection relationship between the external structures of the dryer according to the embodiment of the present invention;

fig. 6 is a schematic view of an internal structure of the dryer according to the embodiment of the present invention.

Reference numbers in the figures: 001-first-level material separating cone, 002-second-level material separating cone, 003-central discharging pipe, 004-central rotating shaft, 005-driving device, 006-discharging plate, 007-air inlet pipe, 008-cage rotor, 009-fine powder discharging pipe, 010-cyclone powder collecting device, 011-feeding pipe, 012-first-level discharging pipe and 013-second-level discharging pipe; 31-a feeding port, 32-a drying cylinder, 33-a discharging port, 34-a rotating disc, 35-a power device, 36-an exhaust pipe, 37-a cooler, 38-a dust removing device, 39-a water outlet, 321-an outer sleeve, 322-an inner sleeve, 323-a flow guide plate and 324-a heating wire.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

One embodiment of the invention as disclosed in fig. 1:

a process for refining and refining sand and powder in dry production of sandstone comprises the following steps:

generally, mine operators decompose ores into coarse materials with the diameter less than or equal to 800mm by using blasting and excavating technologies, and then the coarse materials are transported to a sandstone processing factory by using an ore delivery truck, and the sandstone processing factory crushes the received coarse materials into sandstone raw materials with the diameter less than or equal to 120mm by using primary crushing equipment and transports the sandstone raw materials to a primary screening device by using a belt;

the primary screening device generally screens out 0-3 mm of sand powder and sends the sand powder into a primary winnowing machine; screening sand and stones with the thickness of 3-28 mm and sending the sand and stones into a sand and stone production line; screening sand stones with the diameter of more than 28mm, sending the sand stones into a secondary crushing device for re-crushing, and screening according to the standard after secondary crushing.

in specific implementation, the primary winnowing machine quantitatively blends coarse sand powder with the particle size of 0.6-3 mm into a corresponding sandstone production link, and the rest fine sand powder is sent into the dryer to remove excessive water.

As the sand powder is removed from the incoming material obtained from the primary screening device in the sand production line, the powder content is relatively low, sand products with corresponding particle sizes can be directly produced according to the grade requirements of sand or broken stones, and coarse sand powder conveyed from the primary air separator is added according to the requirement of the powder content after the products are processed and molded, so that the powder content in the sand products is effectively ensured.

In order to further reduce the redundant sand powder generated by machine crushing in the sand production process, dust collecting equipment is correspondingly arranged on a sand production line, the redundant sand powder with the particle size of 0-0.6 mm generated by machine crushing is also collected and transported to a dryer until the coarse sand powder with the particle size of 0.6-3 mm is quantitatively added into sand finally, and therefore the sand content is controlled more accurately.

S4: controlling the water content of the fine sand powder within a fourth preset range by using a dryer, and sending the fine sand powder into a secondary winnowing machine; typically the water content is controlled within < 1%.

In specific implementation, the secondary air separator in the step S5 selects superfine sand with the grain size within the range of 0.075-0.6 mm, and the tertiary air separator in the step S6 selects fine stone powder with the grain size within the range of 0-0.045 mm and common stone powder with the grain size within the range of 0.045-0.075 mm.

Finally, the superfine sand selected by the second-level winnowing machine, fine stone powder selected by the third-level winnowing machine and common stone powder are respectively transmitted to a cache tank for storage by using a hoister, and the fine stone powder can be used in the fields of power plant desulfurization, chemical engineering, pharmacy and the like; the common stone powder can be used for adding concrete, and the superfine sand can be used for dry powder mortar.

In combination with the processing process shown in fig. 1, the embodiment further provides a system for refining sand and powder in dry production of sandstone, which is used for implementing the process and comprises a primary crushing device, a primary screening device, a primary winnowing machine, a dryer, a secondary winnowing machine, a tertiary winnowing machine device and a sandstone production line;

the primary winnowing machine is used for separating the fed sand powder into coarse sand powder with the particle size of 0.6-3 mm, and the coarse sand powder is quantitatively blended to a corresponding sand production link according to the requirements of the powder content of different sand materials in the sand production line; and the rest fine sand powder is sent into the dryer to remove redundant moisture, superfine sand with the particle size within the range of 0.075-0.6 mm is firstly separated by the secondary winnowing machine, and common stone powder with the particle size within the range of 0.045-0.075 mm and fine stone powder with the particle size within the range of 0-0.045 mm are separated by the tertiary winnowing machine.

Referring to fig. 2-4, the secondary winnowing machine includes a primary material-dividing cone 001 and a secondary material-dividing cone 002, a central blanking pipe 003 is disposed in the primary material-dividing cone 001, a central rotating shaft 004 is sleeved in the central blanking pipe 003, the upper end of the central rotating shaft 004 extends upwards and is connected with a driving device 005, the lower end of the central rotating shaft extends out of the blanking port of the central blanking pipe 003 and is connected with a material scattering disc 006, an air inlet pipe 007 is disposed at the lower end of the material scattering disc 006, the secondary material-dividing cone 002 is disposed at the upper end of the inner cavity of the primary material-dividing cone 001, a cavity between the primary material-dividing cone 001 and the secondary material-dividing cone 002 is communicated through an opening at the upper end of the secondary material-dividing cone 002, a cage-shaped rotor 008 is disposed in the secondary material-dividing cone 002 opposite to the opening, and the center of the cage-shaped rotor 008 is connected to the central rotating shaft 004, the upper end of the secondary material separating cone 002 is connected with a fine powder discharging pipe 009, and the circumferential side of the fine powder discharging pipe 009 is annularly and uniformly connected with a plurality of cyclone powder collectors 010.

The upper end of center unloading pipe 003 is connected with the inlet pipe 011 that the slope set up, one-level branch material awl 001 with the lower extreme of second grade branch material awl 002 corresponds respectively and is connected with one-level unloading pipe 012 and second grade unloading pipe 013 that the slope set up.

As can be seen from fig. 3, 4 cyclone powder collectors 010 are provided, and the feeding direction of the feeding pipe 011 and the discharging direction of the first-stage discharging pipe 012/the second-stage discharging pipe 013 can be adjusted according to the actual installation position and the specific process of the equipment.

As can be seen from fig. 4, the secondary air separator and the tertiary air separator have the same structure, the lower ends of the cyclone powder collectors 010 of the secondary air separator are communicated to the feeding pipe 011 of the tertiary air separator, and the primary discharging pipe 012 and the secondary discharging pipe 013 of the secondary air separator are connected in parallel to output ultrafine sand with a grain size within a range of 0.075-0.6 mm.

In specific implementation, the sand powder with moisture removed by the dryer enters from the inlet pipe 011 of the secondary air separator, the upper end of the central rotating shaft 004 is driven by the motor and the belt pulley, the sand powder leaked from the central blanking pipe 003 is dispersed by the spreading disk 006 at the lower end of the central rotating shaft 004, the air inlet pipe 007 at the lower end of the spreading disk 006 blows the sand powder upwards by the external strong fan, the sand powder with larger particle size is collected in the primary material separating cone 001, the sand powder with smaller particle size enters the secondary material separating cone 002 through the upper end of the primary material separating cone 001, the sand powder with relatively larger particle size can be collected in the secondary material separating cone 002 under the drive of the cage-shaped rotor 008, the stone powder with smaller particle size enters each cyclone powder collector 010 through the fine powder outlet pipe 009 at the upper end of the secondary material separating cone 002, and finally the stone powder collection with particle size in the range of 0-0.075 mm can be realized through each cyclone powder collector 010 of the secondary air separator, and the ultra-fine sand within the range of 0.075-0.6 mm can be output from the first-stage discharging pipe 012 and the second-stage discharging pipe 013.

Stone powder in the range of 0-0.075 mm collected by a plurality of cyclone powder collectors 010 of the secondary air separator is sent into a tertiary air separator device for separation;

can understand in combination with above-mentioned process, through the adjustment to the intake, tertiary air separator equipment can collect the fine product mountain flour of particle size in 0 ~ 0.045mm within range from corresponding whirlwind powder collector 010, collects 0.045 ~ 0.075's ordinary mountain flour from one-level unloading pipe 012 and second grade unloading pipe 013 simultaneously.

As can be seen from fig. 5, in an implementation, the dryer includes a feeding port 31, a drying drum 32 and a discharging port 33, the drying drum 32 is disposed at an angle, and a rotating disc 34 and a power device 35 for driving the rotating disc 34 to rotate are connected to the outside of the drying drum 32; generally, the inlet port 31 is higher than the outlet port 33, and sand inside the drum 32 can move from the inlet port 31 to the outlet port 33 by the rotation of the rotary disc 34.

As can be seen from fig. 6, the drying drum 32 includes an outer sleeve 321 and an inner sleeve 322, a plurality of baffles 323 are uniformly distributed between the outer sleeve 321 and the inner sleeve 322, and a heating wire 324 is mounted on the outer sleeve 321.

As can also be seen from fig. 5, in order to facilitate the discharge of the excessive moisture in the drying drum 32, an exhaust pipe 36 is further connected to the discharge port 33, a cooler 37 and a dust removing device 38 are disposed on the exhaust pipe 36, and a drain 39 is further opened on the exhaust pipe 36 at the rear end of the cooler 37.

According to the processing experience, the power of the heating wire 324 and the rotating speed of the rotating disc 34 can be controlled, so that the moisture content of the output sand powder is effectively controlled within the range of 1%; the quality of finished products of fine stone powder, common stone powder and superfine sand is effectively ensured. The exhaust pipe 36 extracts the water vapor in the drying cylinder 32 under the action of the exhaust fan, the water vapor is condensed into water and discharged from the water outlet 39 under the action of the cooler 37, redundant dust is removed through the dust removing device 38, and finally clean air is discharged through the exhaust fan, so that the drying in the drying cylinder 32 can be ensured, and the pollution to the environment can be reduced.

In summary, according to the sand and powder refining treatment process and system in dry production of sandstone, provided by the invention, firstly, through the cooperation of the screening equipment and the primary winnowing machine, the silt and the stone powder in the sandstone production raw materials are effectively removed, and then, according to the requirements of the grade and the powder content of the sandstone, a proper amount of stone powder is added for mixing after the sandstone is processed and molded, so that the powder content of the sandstone is ensured to meet the standard range; meanwhile, by drying and screening the collected stone powder, the grading production of fine stone powder, common stone powder and ultrafine sand with the particle size of more than 325 meshes can be effectively realized, the reasonable utilization of sand powder waste is realized, and the loss of the stone powder is reduced. And the production of the stone powder does not need additional grinding equipment, and only needs to recycle the stone powder generated in the processing process of the sandstone, so that the ore raw materials are more fully utilized, and the economic benefit of sandstone manufacturers is effectively improved.

It should be noted that the above-mentioned embodiment is only one preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited by this embodiment, and it will be understood by those skilled in the art that all or part of the procedures for implementing the above-mentioned embodiment may be changed equivalently according to the claims of the present invention, and still fall within the scope of the present invention.

Claims

1. A process for refining and refining sand and powder in dry production of sandstone is characterized by comprising the following steps:

2. The sand and powder refining treatment process in the dry production of the sand and stone according to claim 1, which is characterized in that: the grain size obtained by the primary crushing in the step S1 is less than or equal to 120mm, the grain size is conveyed to the primary air separator through belt conveying equipment, and sand powder with the grain size of 0-3 mm is conveyed to the primary air separator in the step S2; sending sand and stone with the thickness of 3-28 mm into a sand and stone production line; and (3) conveying the sand with the diameter of more than 28mm into secondary crushing equipment, and sieving according to the standard after secondary crushing.

3. The sand and powder refining treatment process in the dry production of the sand and stone according to claim 1, which is characterized in that: and in the step S3, the primary air separator quantitatively mixes coarse sand powder with the particle size of 0.6-3 mm into a corresponding sand production link, the rest fine sand powder is sent into the dryer to remove excessive moisture, and in the step S4, the dryer is used for controlling the water content of the fine sand powder to be less than 1%.

4. The sand and powder refining treatment process in the dry production of the sand and stone according to claim 1, which is characterized in that: in the step S5, the secondary winnowing machine selects sand powder with the particle size of 0.075-0.6 mm as superfine sand, and in the step S6, the tertiary winnowing machine selects stone powder with the particle size of 0-0.045 mm as fine stone powder, and the rest is common stone powder.

5. The sand and powder refining treatment process in the dry production of the sand and the stone as claimed in claims 1 to 4, which is characterized in that: and dust collecting equipment is also arranged in the sandstone production line and is used for collecting 0-0.6 mm of sand powder and sending the sand powder into the dryer.

6. A sand and powder refining treatment system in dry sand production is used for realizing the process of any one of claims 1 to 5, and is characterized in that: comprises a primary crushing device, a primary screening device, a primary winnowing machine, a dryer, a secondary winnowing machine, a tertiary winnowing machine and a sandstone production line;

the primary winnowing machine is used for separating the fed sand powder into coarse sand powder with the particle size of 0.6-3 mm, and the coarse sand powder is quantitatively blended to a corresponding sand production link according to the requirements of the powder content of different sand materials in the sand production line; and the rest fine sand powder is sent into the dryer to remove excessive moisture, superfine sand with the particle size of 0.075-0.6 mm is firstly separated by the secondary air separator, and fine stone powder with the particle size of 0-0.045 and common stone powder with the particle size of 0.045-0.075 mm are separated by the rest tertiary air separator.

7. The sand and powder refining treatment system in the dry production of the sand and the stone as claimed in claim 6, which is characterized in that: the secondary winnowing machine comprises a primary material distribution cone (001) and a secondary material distribution cone (002), a central blanking pipe (003) is arranged in the primary material distribution cone (001), a central rotating shaft (004) is sleeved in the central blanking pipe (003), the upper end of the central rotating shaft (004) extends upwards and is connected with a driving device (005), the lower end of the central rotating shaft extends out of a blanking port of the central blanking pipe (003) and is connected with a material scattering disc (006), an air inlet pipe (007) is arranged at the lower end of the material scattering disc (006), the secondary material distribution cone (002) is positioned at the upper end of an inner cavity of the primary material distribution cone (001), a cavity between the primary material distribution cone (001) and the secondary material distribution cone (002) is communicated through an opening at the upper end of the secondary material distribution cone (002), and a cage-shaped rotor (008) is arranged in the secondary material distribution cone (002) relative to the opening, the center of the cage-shaped rotor (008) is connected to the central rotating shaft (004), the upper end of the secondary material separating cone (002) is connected with a fine powder discharging pipe (009), and the fine powder discharging pipe (009) is annularly and uniformly connected with a plurality of cyclone powder collecting devices (010).

8. The sand and powder refining treatment system in the dry production of the sand and the stone as claimed in claim 7 is characterized in that: the upper end of center unloading pipe (003) is connected with inlet pipe (011) that the slope set up, one-level branch material awl (001) with the lower extreme of second grade branch material awl (002) corresponds respectively and is connected with one-level unloading pipe (012) and second grade unloading pipe (013) that the slope set up.

9. The sand and powder refining treatment system in the dry production of the sand and the stone as claimed in claim 8, which is characterized in that: the structure of second grade air separator with tertiary air separator equipment is the same, just the lower extreme that powder ware (010) were received to a plurality of whirlwind of second grade air separator communicate to on inlet pipe (011) of tertiary air separator equipment, the superfine sand of output particle diameter within the scope of 0.075 ~ 0.6mm is connected in parallel to one-level unloading pipe (012) and second grade unloading pipe (013) of second grade air separator.

10. The sand and powder refining treatment system for the dry production of the sand and the stone as claimed in any one of claims 6 to 9, which is characterized in that: the dryer comprises a feeding port (31), a drying drum (32) and a discharging port (33), wherein the drying drum (32) is obliquely arranged according to a preset angle, and a rotating disc (34) and a power device (35) for driving the rotating disc (34) to rotate are connected to the outside of the drying drum (32); the drying cylinder (32) comprises an outer sleeve (321) and an inner sleeve (322), a plurality of flow deflectors (323) are uniformly distributed between the outer sleeve (321) and the inner sleeve (322), and the outer sleeve (321) is provided with a heating wire (324);