With declining coal demand, many mining companies are transitioning to sand and aggregate production. Crushing and screening equipment plays a vital role in this shift, enabling efficient processing of raw materials into high-quality construction aggregates.
A typical crushing and sand-making line includes:
1. Primary Jaw Crusher – Processes large rocks (e.g., C6X Series, max feed size ≤1,200mm).
2. Secondary Cone Crusher – Refines material further (e.g., HPT300, capacity 70-400 t/h).
3. Tertiary Impact Crusher/VSI Sand Maker – Produces finely shaped aggregates (e.g., VSI6X1263, output 50-500 t/h).
4. Vibrating Screens – Classifies materials by size (e.g., 3YK3070, screening efficiency ≥90%).
| Equipment | Key Parameter | Application |
|---|---|---|
| Jaw Crusher | Feed Size: ≤1,200mm | Coarse Crushing |
| Cone Crusher | Capacity: 70-400 t/h | Medium/Fine Crushing |
| VSI Sand Maker | Output: 50-500 t/h | Cubic-Shaped Aggregates |
| Screening Plant | Screening Layers: 2-4 layers | Aggregate Gradation Control |
Q1: What is the optimal moisture content for crushing?
*A:* Below 5% ensures smooth operation and prevents clogging.
Q2: How to improve sand yield in VSI crushers?
*A:* Adjust rotor speed (+10% boosts fines production) and maintain proper feed gradation.
A former coal mine in Australia repurposed its site with a 300 t/h granite crushing line:
