Granite Sand Making Production Line

Sand and gravel are one of the important raw materials for engineering construction. With the exhaustion of natural sand and gravel aggregate resources and the intensification of government control, it has become an inevitable trend for the industry to replace natural sand and gravel aggregates with machine-made sand and gravel aggregates.

In the following part, we take a machine-made sand production line as an example to introduce the process design and equipment selection of 2000TPH granite machine-made sand production line.

Project introduction

Raw Material: Granite

Output Capacity: 2000t/h

Product Types: According to market demand, there are 4 product specifications for the machine-made sand and gravel production line, which are 0-4.75mm sand, 4.75-10mm gravel, 10-20mm gravel and 20-31.5mm gravel.

Process design of the production line

Equipment selection

According to the characteristics of the raw granite, the artificial sand production line is designed to be produced by a semi-dry process of three-stage crushing + vertical shaft impact crushing and shaping, and tower-like sand making system. The jaw crusher is used for coarse crushing, the hydraulic cone crusher is used for medium and fine crushing, the vertical shaft impact crusher is used for shaping, and the tower-like sand making system is used for sand making.

According to the requirement of the mine's annual mining volume of 3.7 million m³, the coarse crushing capacity of the machine-made sand production line needs to reach 2000t/h. The design and selection of the three-stage crushing process equipment is configured as 3 sets of jaw crusher + 3 sets of medium crushing cone crusher + 4 sets of fine crushing cone crusher.

The main crushing workshops of the production line include coarse crushing workshop, medium and fine crushing and shaping workshop, and dry sand making workshop; the main screening and washing workshops include desilting and sand washing workshop and screening workshop. The main equipment configuration of each workshop and warehouse is shown in the following table:

Process design of each workshop

Process design of coarse crushing - desilting and sand washing workshop - semi-finished product warehouse

The raw material of the production line is granite. The particle size of raw material fed into coarse crusher should be controlled within 900mm, if there is excess diameter material, we need to dissociate into small particles.

The raw material enters the three sets of grizzly feeders installed below through the receiving pit. The bar gap is set as 150mm, and the aggregates with particle size ≥150mm and a mixture with particle size ＜150mm are separated. Among them, the mixture with particle size less than 150mm is transported to the desilting and sand washing workshop for cleaning and desilting. The desilting and sand washing workshop is equipped with 2 sets of 2460 type circular vibrating screens, 2 sets of spiral sand washing machines, 2 sets of 1645 type linear vibrating screens and fine sand recycling machine; After desilting, the mixture with particle size ≥3mm is dewatered by linear vibrating screen and sent to the semi-finished material warehouse, and the fine sand with particle size <3mm is washed and dewatered and then enter the finished material warehouse. Stone with particle size ≥150mm is transported to semi-finished material warehouse after being coarsely crushed by 3 sets of jaw crushers and the discharge opening of jaw crusher is set to 200mm.

Process design of semi-finished material storehouse - crushing and screening workshop - finished product storehouse

(1) The semi-finished product warehouse is equipped with 3 underground corridor belt conveyors for discharging materials, each underground corridor is equipped with 5 discharging ports, and a total of 9 vibrating feeders are installed. Semi-finished products are transported to the medium crushing workshop through the underground corridor belt conveyor.

(2) Three hydraulic cone crushers are set up in the medium crushing workshop, and the semi-finished materials are crushed by the medium crushing cone crusher and then sent to the 1# screening workshop through the belt conveyor.

(3) The 2# screening workshop is a double-layer screening building, and three circular vibrating screens are installed on each of the upper and lower floors to screen out over-diameter materials with a particle size of ≥45mm, over-diameter materials with a particle size of 31.5-45mm, and 20-31.5mm crushed stone, 10-20mm crushed stone, 4.75-10mm crushed stone and <4.75mm sand.

Among them, the over-diameter materials with particle size ≥ 45mm and 31.5-45mm are sent to the fine crushing workshop, and after being crushed in the fine crushing workshop, they are sent to the 2# screening workshop to form a closed circuit;

The crushed stone with a particle size of 20-31.5mm is divided into two parts (the material flow is adjustable), one part is directly transported to the finished product warehouse, and the other part is transported to the fine crushing workshop to form a closed circuit. If shaping is needed, the part entering the finished material warehouse is adjusted to enter the aggregate shaping workshop;

The crushed stone with a particle size of 10-20mm is directly transported to the finished product warehouse;

the crushed stone with a particle size of 4.75-10mm is divided into two parts (the material flow is adjustable), one part is directly transported to the finished product warehouse, and the other part is transported to the dry-method sand making workshop;

Sand with particle size <4.75mm is transported to desilting and sand washing workshop.

(4) The fine crushing workshop is equipped with a fine crushing warehouse and 4 hydraulic cone crushers.

(5) The 2# screening workshop is a double-layer screening building, and four circular vibrating screens are installed on each of the upper and lower floors to screen out over-diameter materials with a particle size of ≥45mm, over-diameter materials with a particle size of 31.5-45mm, and 20-31.5mm crushed stone, 10-20mm crushed stone, 4.75-10mm crushed stone and <4.75mm sand. The discharge of each grade is the same as that of the 1# screening workshop.

(6) Two vertical shaft impact crushers are set up in the aggregate shaping workshop.

(7) The 3# screening workshop is a single-layer screening building, and two circular vibrating screens are installed to screen out the crushed stone with particle size 20-31.5mm, the crushed stone with particle size 10-20mm, and the crushed stone with particle size 4.75-10mm and sand <4.75mm.

Among them, the crushed stone with a particle size of 20-31.5mm and 10-20mm is transported to the finished product warehouse;

the crushed stone with a particle size of 4.75-10mm is transported to the dry method sand making workshop for sand making;

The sand with a particle size of less than 4.75mm is transported to the desilting and sand washing workshop.

(8) Two dry tower-like sand making machines are set up in the dry sand making workshop.

Process design of finished product warehouse- loading platform

A total of 6 warehouses are set up in the finished product warehouse, including 1 warehouse for 20-31.5mm products, 2 warehouses for 10-20mm products, 1 warehouse for 4.75-10mm products, and 2 warehouses for 0-4.75mm products. Among them, 1 underground corridor belt conveyor is set at the bottom of the 20-31.5mm and 4.75-10mm warehouses, and 2 underground corridor belt conveyors are set at the bottom of the 10-20mm and 0-4.75mm warehouses, and each underground corridor is set 5 discharge ports, and a total of 50 vibrating feeders are installed. Different finished products are transported to the corresponding loading platform through the underground corridor belt conveyor, and each belt corresponds to one loading platform. The storage bin capacity of each loading platform is about 70m³, and it is equipped with one electric arc door and one 100t weighbridge for unloading, loading and weighing.

After the project is completed and put into operation, it can meet the needs of 3.7 million m³ machine-made sand and gravel production lines per year, which can reduce the pressure on the supply of sand and gravel materials in the construction, infrastructure and key construction of the region and surrounding towns.