Rotary Sample Divider for Industrial Laboratories

What is the Rotary Sample Divider for Industrial Laboratories?

A rotary sample divider splits crushed or milled material into representative sub-samples by dropping it through a rotating set of collection vessels. It is used when the laboratory must reduce sample mass while keeping composition unchanged, for example before assay or to retain a referee portion.

Overview

A rotary divider feeds material from a hopper through a vibrating channel at a controlled rate, then lets it fall through a rotating funnel into eight, ten or more collecting vessels. Because every particle has the same probability of entering any vessel, the sub-samples are statistically representative, which is the principle behind the classic riffle and rotary splitting methods. Units are usually driven by a stepper or gear motor with variable speed, and some models accept a whole grinding set so the sample is never exposed to the laboratory air. Dividing before and after each size reduction keeps the sub-sample mass consistent with the method, and features such as adjustable feed rate, dust-tight covers and stainless-steel contact parts support trace and moisture-sensitive work.

How does it work?

Industrial sample preparation reduces a bulk lot to a small test portion without changing its composition. Crushing and milling lower particle size by compressive, impact or shear forces, and representative splitting follows each size-reduction step so the sub-sample still reflects the original lot. Disc mills and ring mills grind to below 75 µm for pressed pellets or fusion, where the sample is melted with a borate flux to dissolve refractory minerals into a homogeneous glass bead. Microwave digestion dissolves samples in acid at elevated temperature and pressure in closed vessels for ICP or atomic absorption measurement. Throughout, materials that touch the sample are chosen to avoid contamination: tungsten carbide for hard ores, zirconia for trace-element work, agate for soft or brittle materials.

What are the key features?

• Eight to sixteen collection vessels in one pass
• Variable feed rate for consistent splitting accuracy
• Dust-tight cover to protect moisture-sensitive samples
• Contact parts in stainless steel or optional plastics
• Accepts powder, granules and crushed material
• Quick-release vessels for fast cleaning between samples

What are the technical specifications?

A typical rotary sample divider for industrial laboratories configuration offers max feed size of ≤ 10 mm, number of divisions of 8–16 vessels, vessel volume of 100–500 mL each, feed rate of Adjustable, 20–100 g/s, rotational speed of 30–100 rpm and contact materials of Stainless steel 304/316. 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 Rotary Sample Divider for Industrial Laboratories is used in sub-sampling of crushed ore and concentrate, referee sample retention in assay laboratories, splitting milled powder before XRF or ICP analysis, cement and clinker raw material division and coal sample division for moisture and ash tests. Across the wider Sample Preparation class, laboratories also deploy it for ore and concentrate assay laboratories, cement, clinker and raw meal quality control and coal and coke sample preparation for ash and sulfur analysis.

Which standards and certifications apply?

Relevant standards and methods include ISO 3082, ASTM D2013, ASTM E877, ISO 3310-1, ISO 2758 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 crushing and milling equipment on a rigid floor with dust extraction and hearing protection, because noise commonly exceeds 80 dB(A). Sieve checks and, for trace analysis, blank grinds with quartz sand keep cross-contamination low; grinding sets wear and should be inspected for cracks. Verify press force and die condition at intervals, and re-check pellet quality after any change of powder supplier. Crucibles, dies and digestion vessels are consumables that must meet the method's contamination specification. Balance calibration, temperature records and traceable reference materials support method validation and laboratory accreditation.

How do I select the right Rotary Sample Divider for Industrial Laboratories?

Specify a rotary divider when a method requires representative sub-sampling at a defined mass ratio, typically before assay and after each comminution stage. Choose vessel number and volume so the retained mass matches the method's minimum sample mass, which itself depends on particle size and material heterogeneity. For trace work, request stainless-steel contact parts and a dust-tight cover; for sticky materials, a vibrating feeder is more reliable than a gravity chute.

How does it compare with other Sample Preparation variants?

Choose by the physical form of the material and the analytical technique that follows. Hard, brittle ores, clinker and ferroalloys need a jaw crusher for primary reduction, then a disc or ring mill for fine grinding; soft polymers and coal may need only a cutting mill. Fusion bead preparation is required when the sample is measured by XRF or ICP and total dissolution is difficult, while pressed pellets are faster and cheaper when only major oxides are sought. Microwave digestion is the quickest route to a clear solution for trace-metal measurement. Specify final particle size, contamination limits for the elements of interest, batch size per shift, cleaning between samples, and whether a method standard demands a defined splitting scheme.