Novel machine-made sand production system and process

Abstract

The invention belongs to the technical field of machine-made sand processing and production, and discloses a novel machine-made sand production system and technology.The system comprises a sand making unit, a finished product screening unit, a winnowing unit and a storing and shipping unit, and the sand making unit comprises a vibrating feeder and a vertical multi-roller grinding crusher; the vibrating feeder can convey materials with the particle size larger than or equal to 3 mm and smaller than or equal to 40 mm in the sand making middle raw material warehouse into the vertical multi-roller grinding crusher to be crushed, the finished product screening unit comprises a first-stage screening device, a second-stage screening device, a third-stage screening device and a fourth-stage screening device, and the winnowing unit comprises a first-stage winnowing device and a second-stage winnowing device. The storing and shipping unit is used for storing materials in a classified mode and shipping the materials. Common machine-made sand and multi-particle-size special machine-made sand can be produced at the same time, the quality of the machine-made sand is high, and the machine-made sand meets the requirements and the development direction of the sandstone market.

Description

Technical Field

[0001] The invention belongs to the technical field of machine-made sand processing and production, and specifically relates to a new machine-made sand production system and process. Background Art

[0002] As an indispensable basic material, sand and gravel are the world's second largest resource consumption after water resources. The 2035 vision goal proposes to strengthen the construction of infrastructure such as transportation, energy, and water conservancy, which will bring long-term and stable demand to the sand and gravel market. In addition, as my country vigorously promotes the construction of ecological civilization, various regions have successively formulated and implemented policies to limit and ban the mining of natural sand and gravel, and the mechanism sand and gravel industry has developed rapidly. Today, the proportion of mechanism sand and gravel in the Chinese market has exceeded 80%, and mechanism sand and gravel enterprises have transformed from "small, scattered, and chaotic" to modern, intensive, and large-scale production. The mechanism sand and gravel industry has gradually achieved high-quality development.

[0003] For machine-made sand, the current mainstream production processes include traditional rod mill wet production, vertical shaft crusher dry production and rod mill + vertical shaft crusher dry and wet combined production process, but due to the limitations of the process and equipment itself, there are many problems such as high energy consumption, high stone powder content, serious segregation, uneven product quality, etc. With the rapid development of the industry, more and more new sand making processes and equipment have emerged, bringing new concepts and developments to the industry.

[0004] In addition, as people pay more and more attention to the building environment, special mortars have become an important direction for the development of new building materials with their thermal insulation, sound absorption, waterproof, corrosion resistance, and radiation protection properties. Representative special mortars include thermal insulation mortar, waterproof mortar, corrosion-resistant mortar, radiation-proof mortar, decorative mortar, etc. In response to the rapidly growing market demand for special mortars, the machine-made sand and gravel industry quickly adjusted its production structure to ensure a reliable supply of special machine-made sand.

[0005] Compared with ordinary machine-made sand, special machine-made sand has a smaller particle size, and has stricter control over stone powder content, oversize, undersize and other indicators, which puts higher requirements on the machine-made sand production process. Therefore, the present invention provides a new machine-made sand production system and process, which can realize the simultaneous production of ordinary machine-made sand and multi-particle-size special machine-made sand, and the machine-made sand has high quality, which meets the market demand and development direction of sand and gravel. Summary of the invention

[0006] The purpose of the present invention is to address the deficiencies in the prior art and provide a new type of machine-made sand production system and process, which can realize the simultaneous production of ordinary machine-made sand and multi-particle size special machine-made sand, and the machine-made sand has high quality, which meets the market demand and development direction of sand and gravel.

[0007] The technical solution adopted by the present invention is a new type of machine-made sand production process, comprising the following steps:

[0008] Step 1: crushing the materials with a particle size of ≥3mm and ≤40mm in the intermediate raw material warehouse of sand making by grinding and crushing equipment;

[0009] Step 2: The crushed material is screened for the first time and is screened into two types of output materials: those with a particle size of >5 mm and those with a particle size of ≤5 mm. The output materials with a particle size of >5 mm are returned to the grinding and crushing equipment for cyclic crushing;

[0010] Step 3: Performing initial air separation on the output material with a particle size of ≤5 mm, and dividing it into two types of output materials: the output material with a particle size of >0.075 mm and ≤5 mm and the output material with a particle size of ≤0.075 mm, and classifying and storing the output material with a particle size of ≤0.075 mm and a part of the output material with a particle size of >0.075 mm and ≤5 mm;

[0011] Step 4: The remaining discharge with a particle size of >0.075 mm and ≤5 mm is screened twice into two types of discharge with a particle size of >2.36 mm and ≤5 mm and a particle size of >0.075 mm and ≤2.36 mm. The discharge with a particle size of >2.36 mm and ≤5 mm is returned to the grinding and crushing equipment for cyclic crushing, and a portion of the discharge with a particle size of >0.075 mm and ≤2.36 mm is stored separately;

[0012] Step 5: Screen the remaining output materials with a particle size of >0.075 mm and ≤2.36 mm three times into three types of output materials with a particle size of >0.83 mm and ≤2.36 mm, a particle size of >0.6 mm and ≤0.83 mm, and a particle size of >0.075 mm and ≤0.6 mm. Return the output materials with a particle size of >0.83 mm and ≤2.36 mm to the grinding and crushing equipment for cyclic crushing, and store the output materials with a particle size of >0.6 mm and ≤0.83 mm separately;

[0013] Step 6: Perform secondary air separation on the output materials with a particle size of >0.075mm and ≤0.6mm, and divide them into two types: particle size >0.1mm and ≤0.6mm and particle size >0.075mm and ≤0.1mm. The output materials with a particle size >0.075mm and ≤0.1mm are stored separately;

[0014] Step seven, screen the output with a particle size of >0.1mm and ≤0.6mm four times to divide it into two types of output with a particle size of >0.3mm and ≤0.6mm and >0.1mm and ≤0.3mm, and store the two types of output with a particle size of >0.3mm and ≤0.6mm and >0.1mm and ≤0.3mm separately.

[0015] The present invention also provides a new type of machine-made sand production system, including a sand making unit, a finished product screening unit, a wind selection unit and a storage and shipping unit, the sand making unit includes a vibrating feeder and a vertical multi-roller grinding and crushing machine, the vibrating feeder can transport materials with a particle size of ≥3mm and ≤40mm in the intermediate raw material warehouse for sand making to the vertical multi-roller grinding and crushing machine for crushing, the finished product screening unit includes a primary screening device, a secondary screening device, a tertiary screening device and a fourth-stage screening device, the wind selection unit includes a primary wind selection device and a secondary wind selection device, and the storage and shipping unit is used for classifying and storing materials and shipping them.

[0016] Furthermore, the first-level screening device is used to implement the initial screening in the above-mentioned process step two, the second-level screening device is used to implement the secondary screening in the above-mentioned process step four, the third-level screening device is used to implement the third screening in the above-mentioned process step five, and the fourth-level screening device is used to implement the fourth screening in the above-mentioned process step seven.

[0017] Furthermore, the first-level air separation device is used to achieve the primary air separation in the above-mentioned process step three, and the second-level air separation device is used to achieve the secondary air separation in the above-mentioned process step six.

[0018] Furthermore, the storage and shipping unit includes a stone powder warehouse for storing materials with a particle size of ≤0.075mm, a No. 1 ordinary sand finished product warehouse for storing materials with a particle size of >0.075mm and ≤5mm, a No. 2 ordinary sand finished product warehouse for storing materials with a particle size of >0.075mm and ≤2.36mm, a No. 1 special sand finished product warehouse for storing materials with a particle size of >0.6mm and ≤0.83mm, a No. 4 special sand finished product warehouse for storing materials with a particle size of >0.075mm and ≤0.1mm, a No. 2 special sand finished product warehouse for storing materials with a particle size of >0.3mm and ≤0.6mm, a No. 3 special sand finished product warehouse for storing materials with a particle size of >0.1mm and ≤0.3mm, and an automatic loading device.

[0019] Furthermore, the first-stage screening device, the second-stage screening device, the third-stage screening device and the fourth-stage screening device are all composed of high-frequency vibrating screens, and the particle size of the screening is controlled by using screens with different apertures.

[0020] Furthermore, the first-stage air separation device and the second-stage air separation device both realize air separation function through a composite powder separator.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention can produce high-quality common machine-made sand and special machine-made sand at the same time through a process flow combining four-fold screening and two-fold air selection, which meets market demand. After the primary screening, the sand material with a particle size of <5mm is subjected to the primary air selection to fully select the stone powder with a particle size of <0.075mm. While ensuring the powder content of the common machine-made sand, the load of the secondary and tertiary screening is reduced, the clogging of the sieve holes is reduced, and the screening accuracy and efficiency of the secondary and tertiary screening are improved. Before the fourth-stage screening, the incoming material with a particle size of 0.075mm-0.6mm is subjected to the secondary air selection to select the special machine-made sand with a particle size of 0.075mm-0.1mm for storage, which further reduces the load of the fourth-stage screening and improves the screening accuracy and efficiency of the fourth-stage screening.

[0023] 2. The present invention is equipped with a complete dust removal system. Dust removal equipment is installed in sand making, screening, air separation and storage, which can fully collect and reuse the stone powder generated in the production process, effectively control the pollution of sand production to the atmosphere, and improve the utilization of sand making by-products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the production process steps of the novel machine-made sand of the present invention;

[0025] Figure 2 This is a schematic diagram of the equipment composition of the novel machine-made sand production system of the present invention;

[0026] Markings in the figure: 1- intermediate raw material warehouse for sand making; 2- vibrating feeder; 3- vertical multi-roller grinding and crushing machine; 5- compound powder classifier; 6- double-row cyclone dust collector; 7- automatic loading device; 8- primary screening device; 9- secondary screening device; 10- tertiary screening device; 11- quaternary screening device; 12- primary air separation device; 13- secondary air separation device; 14- stone powder warehouse; 15- No. 1 ordinary sand finished product warehouse; 16- No. 2 ordinary sand finished product warehouse; 17- No. 1 special sand finished product warehouse; 18- No. 2 special sand finished product warehouse; 19- No. 3 special sand finished product warehouse; 20- No. 4 special sand finished product warehouse. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer and more understandable, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] like Figure 1 As shown, a new type of machine-made sand production process includes the following steps:

[0029] Step 1: crushing the materials with a particle size of ≥3 mm and ≤40 mm in the sand making intermediate raw material warehouse 1 by grinding and crushing equipment;

[0030] Step 2: The crushed material is screened for the first time and is screened into two types of output materials: those with a particle size of >5 mm and those with a particle size of ≤5 mm. The output materials with a particle size of >5 mm are returned to the grinding and crushing equipment for cyclic crushing;

[0031] Step 3: Performing initial air separation on the output material with a particle size of ≤5 mm, and dividing it into two types of output materials: the output material with a particle size of >0.075 mm and ≤5 mm and the output material with a particle size of ≤0.075 mm, and classifying and storing the output material with a particle size of ≤0.075 mm and a part of the output material with a particle size of >0.075 mm and ≤5 mm;

[0032] Step 4: The remaining discharge with a particle size of >0.075 mm and ≤5 mm is screened twice into two types of discharge with a particle size of >2.36 mm and ≤5 mm and a particle size of >0.075 mm and ≤2.36 mm. The discharge with a particle size of >2.36 mm and ≤5 mm is returned to the grinding and crushing equipment for cyclic crushing, and a portion of the discharge with a particle size of >0.075 mm and ≤2.36 mm is stored separately;

[0033] Step 5: Screen the remaining output materials with a particle size of >0.075 mm and ≤2.36 mm three times into three types of output materials with a particle size of >0.83 mm and ≤2.36 mm, a particle size of >0.6 mm and ≤0.83 mm, and a particle size of >0.075 mm and ≤0.6 mm. Return the output materials with a particle size of >0.83 mm and ≤2.36 mm to the grinding and crushing equipment for cyclic crushing, and store the output materials with a particle size of >0.6 mm and ≤0.83 mm separately;

[0034] Step 6: Perform secondary air separation on the output materials with a particle size of >0.075mm and ≤0.6mm, and divide them into two types: particle size >0.1mm and ≤0.6mm and particle size >0.075mm and ≤0.1mm. The output materials with a particle size >0.075mm and ≤0.1mm are stored separately;

[0035] Step seven, screen the output with a particle size of >0.1mm and ≤0.6mm four times to divide it into two types of output with a particle size of >0.3mm and ≤0.6mm and >0.1mm and ≤0.3mm, and store the two types of output with a particle size of >0.3mm and ≤0.6mm and >0.1mm and ≤0.3mm separately.

[0036] like Figure 2As shown, a new type of machine-made sand production system includes a sand making unit, a finished product screening unit, a wind selection unit and a storage and shipping unit. The sand making unit includes a vibrating feeder 2 and a vertical multi-roller grinding and crushing machine 3. The vibrating feeder 2 can transport materials with a particle size of ≥3mm and ≤40mm in the sand making intermediate raw material warehouse 1 to the vertical multi-roller grinding and crushing machine 3 for crushing. The finished product screening unit includes a primary screening device 8, a secondary screening device 9, a tertiary screening device 10 and a fourth screening device 11. The wind selection unit includes a primary wind selection device 12 and a secondary wind selection device 13. The storage and shipping unit is used to classify and store materials and ship them.

[0037] The first-stage screening device 8 is used to realize the initial screening in process step two, the second-stage screening device 9 is used to realize the secondary screening in process step four, the third-stage screening device 10 is used to realize the tertiary screening in process step five, and the fourth-stage screening device 11 is used to realize the fourth screening in process step seven, and the first-stage screening device 8, the second-stage screening device 9, the third-stage screening device 10 and the fourth-stage screening device 11 are all composed of high-frequency vibrating screens and the particle size of the screening is controlled by using screens with different apertures.

[0038] The first-stage screening device 8 includes four high-frequency vibrating screens, which are single-layer screens with a screen mesh size of 5 mm, and screen the materials into materials with a particle size of >5 mm and ≤5 mm;

[0039] The secondary screening device 9 includes two high-frequency vibrating screens, which are single-layer screens with a screen mesh size of 2.36 mm, and screens the materials into materials with a particle size of >2.36 mm and ≤5 mm and materials with a particle size of >0.075 mm and ≤2.36 mm;

[0040] The three-stage screening device 10 includes two high-frequency vibrating screens, which are two-layer screens with mesh sizes of 0.83 mm and 0.6 mm respectively, and screens the materials into materials with a particle size of >0.83 mm and ≤2.36 mm, a particle size of >0.6 mm and ≤0.83 mm, and a particle size of >0.075 mm and ≤0.6 mm;

[0041] The four-stage screening device 11 includes two high-frequency vibrating screens, which are single-layer screens with a screen mesh size of 0.3 mm, and screens the materials into materials with a particle size of >0.3 mm and ≤0.6 mm and >0.1 mm and ≤0.3 mm.

[0042] The primary air separation device 12 is used to realize the primary air separation in process step three, and the secondary air separation device 13 is used to realize the secondary air separation in process step six, and both the primary air separation device 12 and the secondary air separation device 13 realize the air separation function through the composite powder separator 5.

[0043] The primary air separation device 12 and the secondary air separation device 13 also remove dust through a double-row cyclone dust collector 6 and a dust collector (not shown in the figure).

[0044] The storage and shipping unit includes a stone powder warehouse 14 for storing materials with a particle size of ≤0.075mm, a No. 1 ordinary sand finished product warehouse 15 for storing materials with a particle size of >0.075mm and ≤5mm, a No. 2 ordinary sand finished product warehouse 16 for storing materials with a particle size of >0.075mm and ≤2.36mm, a No. 1 special sand finished product warehouse 17 for storing materials with a particle size of >0.6mm and ≤0.83mm, a No. 4 special sand finished product warehouse 20 for storing materials with a particle size of >0.075mm and ≤0.1mm, a No. 2 special sand finished product warehouse 18 for storing materials with a particle size of >0.3mm and ≤0.6mm, a No. 3 special sand finished product warehouse 19 for storing materials with a particle size of >0.1mm and ≤0.3mm, and an automatic loading device 7.

[0045] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] It should also be noted that in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the statement "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

Claims

1. A new type of machine-made sand production process, characterized in that: The steps include: Step 1: crushing the materials with a particle size of ≥3mm and ≤40mm in the intermediate raw material warehouse of sand making by grinding and crushing equipment; Step 2: The crushed material is screened for the first time and is screened into two types of output materials: those with a particle size of >5 mm and those with a particle size of ≤5 mm. The output materials with a particle size of >5 mm are returned to the grinding and crushing equipment for cyclic crushing; Step 3: Performing initial air separation on the output material with a particle size of ≤5 mm, and dividing it into two types of output materials: the output material with a particle size of >0.075 mm and ≤5 mm and the output material with a particle size of ≤0.075 mm, and classifying and storing the output material with a particle size of ≤0.075 mm and a part of the output material with a particle size of >0.075 mm and ≤5 mm; Step 4: The remaining discharge with a particle size of >0.075 mm and ≤5 mm is screened twice into two types of discharge with a particle size of >2.36 mm and ≤5 mm and a particle size of >0.075 mm and ≤2.36 mm. The discharge with a particle size of >2.36 mm and ≤5 mm is returned to the grinding and crushing equipment for cyclic crushing, and a portion of the discharge with a particle size of >0.075 mm and ≤2.36 mm is stored separately; Step 5: Screen the remaining output materials with a particle size of >0.075 mm and ≤2.36 mm three times into three types of output materials with a particle size of >0.83 mm and ≤2.36 mm, a particle size of >0.6 mm and ≤0.83 mm, and a particle size of >0.075 mm and ≤0.6 mm. Return the output materials with a particle size of >0.83 mm and ≤2.36 mm to the grinding and crushing equipment for cyclic crushing, and store the output materials with a particle size of >0.6 mm and ≤0.83 mm separately; Step 6: Perform secondary air separation on the output materials with a particle size of >0.075mm and ≤0.6mm, and divide them into two types: particle size >0.1mm and ≤0.6mm and particle size >0.075mm and ≤0.1mm. The output materials with a particle size >0.075mm and ≤0.1mm are stored separately; Step seven, screen the output with a particle size of >0.1mm and ≤0.6mm four times to divide it into two types of output with a particle size of >0.3mm and ≤0.6mm and >0.1mm and ≤0.3mm, and store the two types of output with a particle size of >0.3mm and ≤0.6mm and >0.1mm and ≤0.3mm separately.

2. A novel machine-made sand production system, used to implement the novel machine-made sand production process as claimed in claim 1, characterized in that: It includes a sand making unit, a finished product screening unit, an air selection unit and a storage and shipping unit. The sand making unit includes a vibrating feeder and a vertical multi-roller grinding and crushing machine. The vibrating feeder can transport materials with a particle size of more than 3mm and less than or equal to 40mm in the intermediate raw material warehouse for sand making to the vertical multi-roller grinding and crushing machine for crushing. The finished product screening unit includes a primary screening device, a secondary screening device, a tertiary screening device and a fourth-stage screening device. The air selection unit includes a primary air selection device and a secondary air selection device. The storage and shipping unit is used for classifying and storing materials and shipping them.

3. The novel machine-made sand production system according to claim 2 is characterized in that: The first-stage screening device is used to implement the initial screening in step two of claim 1, the second-stage screening device is used to implement the secondary screening in step four of claim 1, the third-stage screening device is used to implement the third screening in step five of claim 1, and the fourth-stage screening device is used to implement the fourth screening in step seven of claim 1.

4. The novel machine-made sand production system according to claim 2 is characterized in that: The primary air separation device is used to achieve the initial air separation in step three of claim 1, and the secondary air separation device is used to achieve the secondary air separation in step six of claim 1.

5. The novel machine-made sand production system according to claim 2 is characterized in that: The storage and shipping unit includes a stone powder warehouse for storing materials with a particle size of ≤0.075mm, a No. 1 ordinary sand finished product warehouse for storing materials with a particle size of >0.075mm and ≤5mm, a No. 2 ordinary sand finished product warehouse for storing materials with a particle size of >0.075mm and ≤2.36mm, a No. 1 special sand finished product warehouse for storing materials with a particle size of >0.6mm and ≤0.83mm, a No. 4 special sand finished product warehouse for storing materials with a particle size of >0.075mm and ≤0.1mm, a No. 2 special sand finished product warehouse for storing materials with a particle size of >0.3mm and ≤0.6mm, a No. 3 special sand finished product warehouse for storing materials with a particle size of >0.1mm and ≤0.3mm, and an automatic loading device.

6. The novel machine-made sand production system according to claim 2 is characterized in that: The first-stage screening device, the second-stage screening device, the third-stage screening device and the fourth-stage screening device are all composed of high-frequency vibrating screens, and the particle size of the screening is controlled by using screens with different apertures.

7. The novel machine-made sand production system according to claim 2 is characterized in that: The first-stage air separation device and the second-stage air separation device both realize air separation function through a composite powder separator.

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