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How to design a large gravel aggregate production line is re

Date:2019-06-27 14:50     writer:cement editor     Views:

In view of the fact that sandstone aggregate production enterprises generally have many problems such as small production scale, low production capacity, backward production process and serious environmental pollution, large-scale production lines have become a development trend. This paper shares a 2000t/h mechanism sandstone aggregate production line case.

Project Description


The ore source of this production line is the associated mine for mining limestone ore for cement. It adopts environmental protection technologies such as mud removal, dust removal, multi-stage crushing and screening, aggregate shaping, sand and stone production technology and powder recycling and utilization. .
How to design a large gravel aggregate production line is reasonable? Let’s take a look at this 2000t/h case.

Limestone

plan selection


If the limestone soft rock of this project adopts the hammer breaking scheme, the crushing ratio is too large, the powder is too much, and the yield is too low, resulting in poor economic efficiency. Therefore, this scheme is excluded.

The investment in the smashing + counterattack plan is slightly higher (the equipment weight and investment are not much different, the civil construction investment is slightly higher), but the counter-attack + counter-attack solution power consumption and wear parts operating costs are slightly higher. For the selection of rough-breaking equipment, most of the domestic production plants using limestone to produce aggregates, most of them adopt the smashing + counter-attacking scheme, and a small number of counter-attacking and counter-attacking schemes are adopted.

From the actual situation, due to mining blasting and other reasons, most of the materials that enter the coarse broken feed port are difficult to meet the feed requirements of the impact crusher ≤800mm (requires secondary blasting), under the impact of bulk materials, The impact crusher is deformed by the frame, the counter-attack plate is easily broken, and the equipment failure rate is high. A small number of production plants changed the original impact crusher back to a jaw crusher. Therefore, the project plan adopts the smashing + counterattack solution.

Host equipment and process


See Figure 1 for the main equipment of the mechanism sandstone aggregate production line smashing + counterattack solution. The process flow is shown in Figure 1.

(1) Building aggregate and mechanism sand blasting system.


The aggregate crushing workshop adopts three sets of crusher systems. The mine incoming materials are stably fed by the heavy plate feeder and sent to the rod vibrating screening feeder. The large pieces of the screened material are fed into the jaw crusher. The system processing capacity is about 700~800t/h. The crushed intermediate material is sent directly to the building aggregate and the mechanical sand crushing system. The ≤150mm material sieved by the bar vibrating screening feeder enters the desiccant screening workshop for screening.

(2) Desmut screening and transportation.


The screening workshop uses a double-layer circular vibrating screen with a processing capacity of approximately 700 t/h. The material of 20~150mm is sent to the three counter-breaking systems by the belt conveyor; the material of <20mm is sent directly by the belt conveyor to the closed mud powder storage storage shed. The reserve of the pile shed is about 3000t, the bottom of the stacking shed In the unloading mode, the soil material is conveyed to the ground through a belt conveyor, and an automobile bulk shipping system is arranged at the bottom of the steel plate.

(3) Building aggregate and mechanism sand fine crushing and counter-breaking system.


The material from the coarse crushing workshop is sent to the fine crushing and breaking system through the belt conveyor. The crushing treatment capacity of the impact crusher is about 700~800t/h. At the same time, the material circulation of >330mm (the particle size during sand shaping and the particle size of 31.50mm without sand shaping) screened by the building aggregate and mechanical sand primary screening system also entered the fourth fine crushing.

(4) Building aggregate and mechanism sand primary screening system.


The materials of the counter-breaking system are sent to the first-stage screening system via the belt conveyor, and four double-layer vibrating screens are set. The upper screen is square holes 330mm×330mm (the granularity during sand shaping, the grain size is not sand-shaping) 31.50mm), the lower screen is square hole 30mm × 30mm vibrating screen processing capacity is about 8000t / h. The material of 3~330mm (the particle size during sand shaping and the particle size is 31.50mm when not sand-shaping) enters the buffer tank of six vertical shaft crushers through the belt, and can also directly enter the secondary screening system through the buffer tank. When the particle size is too large, the particle size is 31.50mm when no sand is formed. The material of 0~30mm is transported into the powder selection system through the belt conveyor.

(5) Building aggregate and mechanism sand secondary screening system.


The material from the first-stage screening of 3~330mm (the particle size during sand shaping and the particle size of 31.50mm without sand shaping) enters the building aggregate and the mechanism sand secondary screening system, and six three-layer vibrating screens are set. 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 processing capacity is about 600t/h. Among them, the materials on the sieve (more than 200mm and 4~90mm) are required to enter the storage tank and return to the vertical shaft; 0~40mm return to the powder separator system, 9~220mm only requires direct access to the building aggregate storage.

(6) Mechanism sand vertical shaft crushing system.


3~33mm from the buffer chamber (the particle size during sand shaping, the particle size is 31.5mm when the sand is not shaped). After the material is discharged, the material is fed into the mechanism sand vertical shaft crushing system through the unloading scale. The rated processing capacity of the sand making machine is about 500t / h, sand production ≥ 175t / h.

(7) Mechanism sand powder selection and conveying system.


The 0~3mm material from the first screening workshop and the second screening 0~4mm enter the powder selection workshop. The amount of mixed material processed by each compound sorting machine is about 350t/h, and 0~0.075mm after powder selection. The stone powder enters the Φ16m steel plate storage, the fine sand with the fineness modulus of 0.075~2.3mm and the medium sand with the fineness modulus of 2.3~3mm are respectively sent by the belt conveyor to the corresponding mechanism sand product warehouse, and also a mixed Sand finished product library.

(8) Building aggregate and mechanism sand storage loading system.


The finished products produced in each process enter the building aggregate and the mechanism sand storage and loading system. A total of 7 steel plates with Φ29m×32m reserves of about 18000t are stored to store various materials (the main type 9~22mm two storage, 22~31.5mm , 4~9mm, fine sand with fineness modulus of 0.075~2.3, medium sand with fineness modulus of 2.3~3, mixed sand with fineness modulus of more than 3, one storage tank).

(9) Building aggregate and mechanism sand car bulk shipping system.


The seven-storage steel plate bottom unloading method with a reserve of about 18,000 tons conveys various finished materials to six Φ10m×19m steel plates through two belt conveyors, with a reserve of about 1000t. Two car bulk shipping systems are installed at the bottom of each steel plate.

(10) Stone powder storage and automobile bulk.


The stone powder collected from various workshops of the whole factory was sent to the corresponding steel plate warehouse. The building aggregate and the mechanism sand fine crushing counter-breaking system set up a Φ16m×30m steel plate warehouse with a reserve of about 3000t. The mechanism sand powder selection system set a Φ160m×30m steel plate. The warehouse has a reserve of about 3000t and is set in the factory. An automobile bulk shipping system is installed at the bottom of each steel plate.

(11) Auxiliary production workshop.


The project is to set up a central laboratory and control room in the plant to be responsible for the inspection of raw materials and finished products of the whole plant; a compressed air station is provided for the production of compressed air in the plant.

At present, China consumes tens of billions of tons of sand and gravel aggregate each year, which is the second largest natural resource that consumes the most after water. However, over the years, China's sand and gravel aggregate industry has not yet formed a unified technical standard and system, the industry's technical content is low, and the engineering design level is uneven. current. The sand and gravel aggregate industry is in an important period of transformation and upgrading, and scientific development and green development have become the main direction. I hope that the above design ideas of the production line can give you some reference.

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Active lime is produced from limestone dolomite chalk and other minerals with high calcium carbonate content by the calcination process under the temperature of 1000-1100 ° C. There are various processes for the active lime production mainly

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