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How to design a large sand aggregate production line? Let's take a look at this case-the scheme of 2000t/h mechanism sand aggregate production line.

Date:2019-06-26 14:09 Source:未知Views:

Introduction to the Project


The ore source of the production line is the associated ore for cement limestone mining, which adopts environmental protection technologies such as mud removal, dust removal, multi-stage crushing and screening, aggregate shaping, sand and stone production, and the recovery and storage of powder.

scheme selection


If the limestone soft rock of this project adopts hammering scheme, the crushing ratio will be too large, the powder material will be too much, and the yield will be too low, which will lead to poor economic benefit, so this scheme will be excluded.

The investment of the anti-breaking + counter-breaking scheme is slightly higher (the equipment weight and investment are not big, the civil investment is slightly higher), but the power consumption and the operation cost of the wear part are slightly higher. For the type selection of the rough-breaking equipment, the domestic use of limestone to produce the aggregate production plant, most of which adopt the anti-break + counter-attack scheme, and a small part adopts the anti-cracking and anti-attack solution.
From the actual situation, due to mining blasting and other reasons, most of the materials entering the rough break inlet are difficult to meet the feeding requirements of the counterattack crusher ≤ 800mm (requiring secondary blasting). Under the impact of large pieces of material, the counterattack crusher produces the frame deformation, the counterattack plate is easy to break and so on, and the equipment failure rate is high. A small number of production plants will be the original counterattack crusher back to jaw crusher. Therefore, the project adopts the scheme of jaw breaking and counterattack.

Host equipment and process flow.


Main equipment of jaw Breaking and counterattack Scheme in Mechanical Sand aggregate production Line

(1) Building aggregate and mechanism sand jaw breaking system.

The coarse crushing workshop of the aggregate adopts three sets of crusher system, the incoming material of the mine is stabilized and fed by the heavy plate type feeder, and then is sent to the bar feeder of the bar vibrating screen, and the screened bulk material is fed into the crusher, and the processing capacity of the system is about 700-800t/ h. The crushed intermediate material is directly sent to the building aggregate and the mechanism sand fine crushing and breaking system. The material with the size of 150 mm screened by the bar feeder of the bar vibrating screen is passed to the mud-removing and screening workshop for screening.

And (2) screening and conveying the mud.

A double-layer circular vibrating screen is used in the screening workshop, and the material with processing capacity of about 700t/h.20~150mm is sent from the belt conveyor to three counterattack breaking systems.

(3) The fine crushing and breaking system of the building aggregate and the mechanism sand.

The material from the rough crushing workshop is sent to the fine crushing and impact breaking system by the belt conveyor, and the crushing and processing capacity of the anti-impact crusher is about 700 to 800 t/ h. At the same time, the material circulation of the screening system of the primary screening system of the building aggregate and the mechanism sand is more than 330 mm (the particle size at the time of sand making and shaping, the grain size of the sand-making and shaping is 31.50 mm), and the material circulation also enters the fourth stage for crushing and breaking.

(4) the primary screening system of building aggregate and machined sand.

The material of the counterattack breaking system is sent to the first screening system through the belt conveyor, and four double-layer vibrating screens are set up, the upper screen is square hole 330mm × 330mm (the particle size is 31.50mm when sand shaping is not sand shaping), and the material with square hole 30mm × 30mm vibrating screen processing ability is about 8000t/h.3~330mm (particle size in sand shaping, 31.50mm in sand shaping) enters the buffer bin of six vertical shaft crushers through belt. It can also enter the secondary screening system directly through the buffer bin (the particle size of sand making and shaping is not large, and the sand is not made. Particle size is 31.50mm during shaping);0~30mm materials are transported into the powder separation system by belt conveyor.

Six three-layer vibrating screens are set up, the upper screen is square hole 220mm × 220mm, the middle screen is square hole 90mm × 90mm, and the lower screen is square hole 40mm × 40mm, and the design and processing capacity is about 600t / h. the material from the first stage screening 3~330mm (sand forming granularity, non-sand shaping particle size is 31.50mm) enters the secondary screening system of building aggregate and machined sand. Six three-layer vibrating screens are set up, the upper screen is square hole 220mm × 220mm, the middle screen is square hole 90mm × 90mm, the lower screen is square hole 40mm × 40mm, and the design and processing capacity is about 600t / h. Among them, the material requirements of the screen (larger than 200mm and 4~90mm) can not only enter the storage but also return to the vertical shaft to break; 0~40mm returns to the powder separator system, 9 ≤ 220m.

(6) Mechanism sand shaft crushing system.

After unloading the 3~33mm (grain size in sand shaping, 31.5mm in non-sand shaping) from the buffer bin, the material is fed into the mechanism sand shaft crushing system through the unloading scale. The rated treatment capacity of the sand making machine is about 500 t / h, and the sand production is ≥ 175 t / h.

(7) Mechanism sand powder separation and transportation system.

the materials from 0 to 3 mm from the primary screening workshop and the secondary screening of 0 to 4 mm enter the powder selection workshop, and the amount of the mixed material is about 350 t/ h for each composite powder selection machine, and the stone powder of 0 to 0.075 mm after the selection of the powder enters the steel plate storage of the coal mill 16m, The fine sand with the fineness modulus of 0.075 to 2.3 mm and the medium sand with the fineness modulus of 2.3 to 3 mm are respectively sent to the corresponding mechanism sand finished product warehouse by the belt conveyor, and a mixed sand finished product warehouse is also arranged.

(8) The construction aggregate and the mechanism sand storage and loading system.

the finished product produced by each process enters the building aggregate and the mechanism sand storage and loading system, and the steel plate base with a total of 7 to 29m and 32m reserves of about 18000t is provided for storing various materials (9 to 22 mm of main varieties,22 to 31.5 mm,4 to 9 mm, and the fineness modulus of 0.075 to 2.3) and medium sand of the fineness modulus of 2.3 to 3, A mixed sand having a fineness modulus of 3 or more, and a reservoir).

(9) Bulk shipping system of building aggregate and machinery sand vehicle.

7 steel plate warehouses with a reserve of about 18,000t are unloaded at the bottom, and various finished materials are conveyed to 6 Φ10m×19m steel plate warehouses through two belt conveyors, with reserves of about 1000t. Two automobile bulk shipping systems are set at the bottom of each steel plate warehouse.

(10) Stone powder storage and automobile bulk loading.

The stone powder collected from each workshop of the whole factory is sent to the corresponding steel plate storehouse, in which a Φ 16m × 30m steel plate bank is set up in the building aggregate and mechanism sand fine crushing counterattack system, and a Φ 160m × 30m steel plate bank is set up in the mechanism sand powder separation system, with reserves of about 3000t, which is set up in the factory area. The car bulk shipping system is set up at the bottom of each steel plate warehouse.

(11)Auxiliary production workshop.

A central laboratory and control room shall be provided in the plant for inspection of the raw materials and finished products of the whole plant, and a compressed air station shall be provided for compressed air for production in the plant area.

At present, our country is to consume hundreds of tons of aggregate of sand and stone every year, and it is the second largest natural resource that is consumed most after the water. However, the aggregate industry in China has not formed a unified technical standard and system for many years, and the technical content of the industry is low and the engineering design level is uneven. Current. The sand and stone aggregate industry is in an important transformation and upgrading period, and the scientific development and the green development have become the main direction.

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