Granite Sand Making Production Line (Combined Wet & Dry Process)

Material: Granite

The main mineral components of the ore are quartz (about 55%), plagioclase (about 20%), potassium feldspar (20%), and a small amount of biotite (3%) and amphibole (2%), with a porphyritic and blocky structure.

Product Requirements

When designing the processing flow, factors such as finished particle size, grading particle size, product proportion, and quality standards should be considered. The design and production indicators for product particle size and proportion are listed in the table.

Item	Construction Aggregates			Washed Sand	Soil Removal Residue	Filter Cake
Particle Size / mm	20 ~ 31.5	10 ~ 20	5 ~ 10	0 ~ 5	0 ~ 10	0 ~ 1.18
Proportion / %	22	25	17	24	5	9

Processing Flow

Based on feedstock characteristics, local natural conditions and client demands, we adopt a combined wet-dry technological route: multi-stage crushing & screening → aggregate shaping → re-screening → wet sand washing.

The aggregate processing system adopts a dry production process, while the mechanism sand is produced using a wet water washing process. Detailed process steps are as follows:

1. Primary Crushing & Mud Removal Process

Ore is delivered to the raw ore bin by dump trucks. A vibrating grizzly feeder discharges raw ore into the jaw crusher; the feeder rod spacing is set to 150 mm. Oversize materials above 150 mm go into the jaw crusher for primary coarse crushing (Crushing 1). Undersize materials below 150 mm flow through a flap-gate chute onto a belt conveyor and are conveyed to the mud removal screen.

The mud removal screen is a double-deck vibrating screen with upper deck aperture 50 mm and lower deck aperture 10 mm. On-screen materials larger than 10 mm are sent via belt feeder to the secondary crushing surge bin (Crushing 2). Materials finer than 10 mm are transported as waste to the mine waste stockpile.

2. Secondary & Tertiary Crushing Process

Material from the secondary & fine crushing surge bin is fed into the cone crusher via a apron feeder. Crushed medium-fine ore is conveyed to the screening plant by belt conveyor.

3. Screening Process

Medium and fine crushed material is delivered through belt conveyors and pre-screening bulk chutes into vibrating screens for grading. Particles over 31.5 mm return to the fine crushing surge bin (Screening 1); particles below 31.5 mm are transported to the shaping & sand-making surge bin via belt conveyor.

4. Sand Making Process

A vertical shaft impact crusher is used for aggregate shaping and artificial sand production. Discharged material is lifted by bucket elevators and conveyed by belt to the finished product screening unit (Screening 2).

20–31.5 mm aggregates are transported to the dedicated 20–31.5 mm finished product silo;
10–20 mm aggregates are delivered to the 10–20 mm finished product warehouse;
5–10 mm aggregates are conveyed to the 5–10 mm finished product silo;
The screened 0–5 mm fine fraction is sent to the sand washing surge bin via belt conveyor.

5. Sand Washing Process

The 0–5 mm fine material is cleaned by spiral sand washers. Clean wet sand is transported by belt conveyor and stockpiled in the finished sand storage shed.

Washing wastewater undergoes flocculation, concentration and sedimentation in the gravity thickener, followed by dewatering via filter press. Overflow from the thickener and filtrate from the filter press flow into the factory circulating water tank for full recycling with zero discharge. Filter press mud cakes are transported by belt conveyors to temporary stockyards as raw materials for brick manufacturing.