The double-roll crusher not only serves as an effective sand mining gold crusher for placer mining but also stands as the preferred solution for processing medium-to-low hardness, cemented placer gold deposits. Utilizing its unique compression crushing principle, it effectively liberates gold particles while acting as a “guardian of gold grains.” With higher recovery rates and lower overall operating costs, it emerges as a reliable partner for investors seeking to realize their.
sand mining gold crusher
1. What is a double-roll crusher?
A double-roll crusher, also known as a twin-roll crusher, is a classic piece of equipment that crushes materials through compression and shearing forces. It consists of a frame, a pair of counter-rotating rollers, a power system (motor and reducer), spring or hydraulic pressure devices, and an adjustment mechanism. Its core feature is the ability to precisely control output particle size by adjusting the roller gap, effectively preventing over-crushing—a critical factor for preserving gold particle integrity.
2. Processed Material: What Does It Crush in Gold Mining?
In placer gold mining operations, the double-roll crusher primarily processes placer gold ore. This type of ore typically consists of the following components:
Main Ore Matrix: Includes pebbles, river sand, gravel, etc., found in riverbeds and ancient river channels.
Gold-bearing layers: Weathered sandstone, clay nodules, or cemented conglomerate rich in gold particles. Gold grains are typically embedded in these materials either in a free state or as inclusions within minerals like quartz.
The dual-roll crusher’s function is to effectively break down and disintegrate these agglomerated and cemented ore masses, releasing the gold particles. Crucially, it must avoid over-crushing or flattening the gold particles into flakes, preventing their loss during subsequent mineral processing stages like sluice boxes and shaking tables.
3. Working Principle
Two rollers fitted with wear-resistant skins rotate toward each other under power, forming a crushing chamber. Agglomerated ore containing gold particles is fed into this chamber, subjected to immense static pressure exerted by the rollers. This force is sufficient to fracture the gangue (e.g., weathered quartz, sandstone) encasing the gold particles, but for the resilient gold particles themselves, it primarily disaggregates rather than pulverizes them. Material is crushed as it passes through the fixed gap between the two rollers. Precisely setting this gap ensures the final particle size meets the requirement for effectively liberating gold grains from gangue while minimizing excessive crushing or flattening of the gold grains themselves. This represents a distinct advantage over impact-type equipment like vibrating jaw crushers or hammer crushers. The crushed material—now separated gold particles and sand/gravel—is efficiently discharged from the bottom, proceeding to the next mineral processing stage.
4.Advantages
Effectively protects gold particles, preventing over-grinding and tableting
Delivers uniform and controllable particle size distribution
Low over-grinding rate, high recovery rate
Simple structure, strong adaptability
Low energy consumption, economical operation
