Laboratory Jaw Crusher for Ore Samples

What is the Laboratory Jaw Crusher for Ore Samples?

A laboratory jaw crusher breaks hard ore and rock from about 50 to 100 mm down to a few millimetres by compressing material between a fixed and a moving jaw. It is normally the first stage of ore sample preparation.

Overview

Rock is fed into a V-shaped chamber where an eccentric shaft drives the moving jaw towards a fixed jaw, crushing the material as the gap closes. The closed-side setting, adjustable from about 2 to 20 mm, determines the product size, and a discharge chute delivers material to a tray or the next stage. Laboratory units accept feed openings from 60 by 100 mm to about 200 by 150 mm and process from 100 to 500 kg per hour, which suits batch preparation of drill core, channel samples and plant samples. Manganese steel plates are standard for abrasion resistance; tungsten carbide plates are used when iron contamination must be minimised. For hard quartz-bearing rock the chamber should be sealed with an extraction connection, and feeding must be steady to avoid stalling the drive.

How does it work?

Size reduction in mineral laboratories relies on compression, impact and shear, and each machine type applies them differently. Jaw crushers compress rock between a fixed and a moving jaw, and the closed-side setting controls product size. Roll crushers pass material between two rotating rolls and give a narrower product with less fines. Cone crushers use a gyrating mantle inside a concave to crush continuously at higher throughput. Hammer crushers strike material with swinging hammers against a breaker plate and discharge it through a screen. Reduction ratio per stage is limited, typically three to six to one, so laboratories arrange two or three crushers in series: a primary jaw, a secondary roll or cone and a final pulverizing stage. Feed must be steady, dry and below the rated size, because overfeeding stalls the drive and raises wear. Grinding surfaces are made of manganese, chrome or tungsten carbide, and the choice affects contamination.

What are the key features?

• Adjustable closed-side setting from about 2 to 20 mm
• Feed opening of 60 × 100 mm up to 200 × 150 mm
• Manganese steel or tungsten carbide jaw plates
• Sealed chamber with dust extraction connection
• Belt drive with overload slip protection
• Collecting tray or chute for continuous discharge

What are the technical specifications?

A typical laboratory jaw crusher for ore samples configuration offers feed opening of 60 × 100 mm to 200 × 150 mm, maximum feed size of 50–100 mm, product size of 2–20 mm adjustable, throughput of 100–500 kg/h, jaw plate material of Manganese steel or tungsten carbide and motor power of 1.5–5.5 kW. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Laboratory Jaw Crusher for Ore Samples is used in primary crushing of drill core and mine samples, preparation of hard rock and quartz ore, reduction before roll or cone crushing and concentrate and slag sample preparation. Across the wider Sample Crushers class, laboratories also deploy it for primary crushing of mine and drill core samples, secondary crushing before pulverizing and concentrate and tailings sample preparation.

Which standards and certifications apply?

Relevant standards and methods include ISO 3082, ISO 12743, ASTM E877, GB/T 2007 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install crushers on a rigid floor with enough clearance for the moving jaw or cone, and anchor them so vibration does not loosen the drive. Provide dust extraction designed for mineral dust and, where silica is present, follow local occupational exposure limits and provide respiratory protection. Feed in small increments at the rated rate rather than in batches that choke the chamber, and never feed wet, sticky material that blinds screens. Record the closed-side setting and product size after each adjustment, and replace worn plates, rolls or hammers before the product size drifts outside specification. Reduce dust formation by keeping material slightly damp only if the method allows, since added water changes the sample moisture. Clean thoroughly between samples, and run a small quantity of the next sample through as a purge when trace-grade work is done.

How do I select the right Laboratory Jaw Crusher for Ore Samples?

Select the jaw crusher as the primary stage, sizing the feed opening to your largest lumps and the setting range to the next machine. Add dust extraction, consider tungsten carbide plates for trace element work, and specify spare plates and a torque check on the drive.

How does it compare with other Sample Crushers variants?

Work backwards from the analytical fineness you need. Match the primary crusher feed opening to the largest lump arriving from the field, then choose one or two further crushing stages so that the pulverizer receives material below its rated feed size, usually 1 to 3 mm. Check the reduction ratio at each step and keep it moderate, since forcing a large reduction increases wear and produces a wider size spread. Consider hardness and abrasiveness: quartz-rich and iron ore samples wear manganese steel quickly, so hardened or carbide-lined surfaces may be justified. Decide how contamination-sensitive the assay is, because chromium and iron from the crushing surfaces bias Ni, Cr and Fe values. Look for sealed, dust-extracted housings since respirable crystalline silica is a health hazard, and for adjustable settings with an accessible calibration, so the product size can be verified on a sieve.