River stone is widely recognized as an ideal construction raw material due to its exceptionally high silica content ($SiO_2$) and dense physical structure. This material possesses outstanding natural properties, including superior compressive strength, wear resistance, and corrosion resistance. However, for crushing equipment, river stone acts as a “double-edged sword”: its extreme hardness results in a drastically shortened service life for wear parts in conventional machinery, leading to soaring maintenance costs.

In response to the widespread availability of river stone resources across Indonesia’s rivers, ZME introduces a design concept centered on “Staged Classification, Grinding Replacing Crushing.” We prioritize wear resistance above all else in our system design. Through a scientifically optimized configuration, we guarantee premium manufactured sand quality while drastically reducing operational costs per ton..

Standard Process Flow for River Stone Sand Production (Input Size <200mm)

For river stones with a feed size under 200mm, ZME recommends an efficient closed-circuit process: Pre-screening + Secondary Crushing (Cone Crusher) + Fine Crushing (VSI Sand Maker).

1. Pre-screening: The First Line of Defense in Cost Control

The raw material enters Vibrating Screen 1# via a feeder for initial separation.

• Separation Logic: Material >40mm enters the Cone Crusher; material 5–40mm bypasses directly to the Vertical Shaft Impact (VSI) Crusher; while 0–5mm natural sand goes straight to the Sand Washing Machine.
• Value Added: This step prevents fine material from entering the crushers, avoiding “inefficient wear” and “energy waste,” which directly reduces operational costs by approximately 20%.

2. Cone Crusher Crushing: The Main Force for Handling Hard Rock

For river stones sized >40mm, traditional Impact Crushers cannot withstand the abrasiveness. ZME configures a High-Efficiency Hydraulic Cone Crusher that utilizes the laminated crushing principle. Through massive compressive force, the stone is crushed while achieving a significantly longer wear part service life compared to impact-type equipment.

3. VSI Crushing: The Heart of Manufactured Sand Production

This is the “heart” of the entire production line, utilizing the ZME New Type Vertical Shaft Impact Crusher (Sand Maker).

• Dual Function: This equipment performs both fine crushing and coarse grinding. The “stone-on-stone” crushing principle causes materials to collide at high velocities inside the crushing chamber, producing manufactured sand with a perfect cubical shape and minimal flakiness.
• Performance Advantage: Simple structure with low operational costs, making it the ultimate key to producing high-standard construction sand (such as for airports, bridges, and high-rise buildings).

4. Closed-Circuit & Washing: Final Quality Assurance

Material from the VSI Crusher is precisely separated via Vibrating Screen 3#. Material >20mm is returned for re-crushing; material <20mm proceeds to the finished product stockpiles. Depending on the cleanliness of the raw material, the 0–5mm manufactured sand can be routed to a Sand Washing Machine to remove silt and impurities, yielding high-quality sand with a uniform gradation.

River Stone Sand Production Line Configuration Scheme (Estimated Example)

No.	Unit / Equipment	Model	Process Stages	Qty	Key Parameters / Characteristics	Function / Purpose
1	Vibrating Grizzly Feeder	ZSW420×110	Feeding & Pre-screening	1 Unit	Even material distribution	Feeding raw materials into the system and supporting the initial screening process to reduce operating costs.
2	Incline Vibrating Screen Seri YK 1#	3YK1860	Pre-screening	1 Unit	Size separation: 0–5mm, 5–40mm, >40mm	Directing natural sand to the sand washer, 5–40mm material to the sand maker, and only >40mm to the cone crusher; saving up to ±20% energy.
3	Hydraulic Cone Crusher Efisiensi Tinggi	GP200Z atau HP200	Secondary Crushing	1 Unit	Laminated crushing, full hydraulic control	Crushing high-abrasion river pebbles with a high reduction ratio and stable output for a target of ±180 TPH.
4	Vertical Shaft Impact Crusher (VSI Sand Maker)	ZME VSI Series	Sand Making & Shaping	1 Unit	Dual-mode “stone-on-stone” & “stone-on-iron”	Producing cubical-shaped manufactured sand with low flakiness and high quality.
5	Vibrating Screen 2#	2YK2160	Final Screening	1 Unit	Closed circuit (>20mm returned to VSI)	Separating materials according to size, fine materials proceed to the finished product area.
6	Bucket Sand Washer	XSD3016	Sand Washing	1 Unit	Mud and impurity removal	Producing premium construction sand with well-graded particle size distribution and high strength.
7	Sistem Belt Conveyor Tugas Berat	B800 / B650	Material Transport	1 Set	Reinforced rollers and belts	Connecting each stage of the process and ensuring an automated and stable material flow.
8	Kabinet Kontrol Otomatis PLC	—	Control System	1 Set	One-button operation, real-time current monitoring	Ensuring continuous production stability at around 180 TPH and enhancing operational safety.

Performance Advantage Summary

1. High Automation: The entire line is equipped with a PLC control system to minimize manual intervention and maintain operational stability.
2. Superior Particle Shape: The produced manufactured sand features excellent gradation, high compressive strength, and no internal micro-cracks—making it the ideal replacement for natural sand.
3. Significant Economic Efficiency: Through pre-screening and proper equipment selection, the replacement cycle for wear-resistant parts can be extended by 30%–50%.
4. Eco-Friendly: Low noise and dust emissions, with the capability to integrate a water recycling and treatment system..

We do not just sell machinery. For every river stone project in Indonesia, ZME customizes the most rational and economic design based on your material’s silica content, finished sand gradation requirements, and site topography. We deliver more than just equipment; we provide long-term technical support and cost-control guarantees.