Laboratory Hammer Crusher for Minerals

What is the Laboratory Hammer Crusher for Minerals?

A laboratory hammer crusher reduces mineral samples to about one to three millimetres with swinging hammers and a discharge screen, handling soft to medium-hard ore at high throughput. It is often used before pulverizing.

Overview

Material entering the chamber is struck by hammers mounted on a fast-rotating shaft and is thrown against a breaker plate, then discharged through a screen whose aperture sets the maximum product size. Because impact rather than compression does the work, the machine handles brittle, soft to medium-hard minerals efficiently and tolerates feed with some moisture, though sticky material blinds the screen. Throughput ranges from 100 to over 1000 kg per hour for laboratory and pilot sizes, with rotors turning at 1000 to 3000 rpm. The product contains a higher proportion of fines than roll crushing, which may be acceptable or even desirable when the next stage is pulverizing. Hammer tips, liners and screens are wear parts, and their condition directly affects product size and contamination.

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?

• Swinging hammers with hardened or carbide tips
• Discharge screens in 1, 2, 3 and 6 mm apertures
• Feed size up to about 40 mm
• High throughput for brittle minerals
• Quick-opening case for cleaning and screen change
• Sealed design with dust extraction connection

What are the technical specifications?

A typical laboratory hammer crusher for minerals configuration offers maximum feed size of 20–40 mm, product size of 1–3 mm with matching screen, throughput of 100–1000 kg/h, rotor speed of 1000–3000 rpm, screen apertures of 1, 2, 3, 6 mm and hammer material of Hardened steel or tungsten carbide. 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 Hammer Crusher for Minerals is used in brittle mineral and industrial mineral crushing, preparation before ring mill pulverizing, limestone, gypsum and clay sample reduction and slag and clinker 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 Hammer Crusher for Minerals?

Use the hammer crusher when throughput matters and the ore is brittle rather than extremely hard or abrasive. Specify screen apertures, hammer material and extraction; plan a stock of wear parts, since hammers and screens set both the product size and the wear cost per tonne.

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.