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Mills and Crushers Serving the Labs.

Mills, Crushers, Sample dividers & XRF Press & Die sets

The sample should be of a size and nature to be representative of the sample mass of interest. For fine-grained sample this may be only 400-500 g, but for coarse grained sample is not unusual to begin with a sample of 10 – 15 kg. The entire sample is crushed in a jaw crusher that can be readily cleaned.

Crushing can be accomplished with a crusher as the Rocklabs Boyd Crusher with two moving jaws.

Size reduction in one pass: 25 times

Max. feed size: 60 mm

Final fineness : 2 mm

The crushed sample is split as many times as necessary to obtain an aliquot of approximately 100 ml.

Sample dividing can be accomplished with a Rotating Sample Divider as the Rocklabs RSD.

This Rotating Sample Divider has been designed to be used alongside the Boyd Crusher for ‘one step’ Crushing and Splitting. (Combo)

This aliquot is pulverized to a powder, at least fine enough to pass through a 200 mesh screen (74µm opening size). Theoretically the finer the better, but excessive pulverizing can cause serious contamination.

Milling can be accomplished with a mill as the Rocklabs Ring Mills.

Max. feed size: 10 – 5 mm (depending of the material)

Final fineness : < 75 µm (depending of the material)

Bench Top Ring Mill - Standard Ring Mill - Continuous Ring Mill

During pulverizing there are three major sources of contamination:

· the analyst’s hand (1)

· the previously pulverized sample (2)

· the crushing container (3)

Contamination from this source can be minimized if the sample and crushing container are handle only with plastic gloves.

To minimize contamination from the previous sample,

the head are washed after each run

or two 100 ml aliquots of sample are run separately, and the first aliquot is discarded.

In some case, a run of pure silica sand can be made between sample runs to “clean” the container (head). This may introduce SiO2 contamination but it will normally be a tiny fraction of the total SiO2 in the sample( depending of the material).

This source cannot be eliminated, but appropriate choice of grinding containers can reduce the contamination to elements that are not of great interest. For example: a tungsten carbide head would not be used when W and Co are important to the analyst. Rocklabs provides data on contamination to be expected from the various grinding containers.

Mechanised and Automated system

A Automated/Mechanised System is a combination of two or more machines and devices to enable the process of sample prepartion to be carried out without any operator action.

MECHANISED SAMPLE PREPARATION SYSTEMS... AUTOMATED SAMPLE PREPARATION SYSTEMS...

Rocklabs Automated/Mechanised Systems are custom designed and built to meet the requirements of each laboratory.

XRF Press & Die sets

40 Tonne Hydraulic press	A Bench Mounted fully automatic Electro-Hydraulic Press for preparing powder samples for Spectrolaser and X-Ray Fluorescence Analysis. Variable up to 40 tonne capacities with see through polycarbonate safety door and interlocks.

12 Tonne Manual Press	A manually operated hand press designed for preparing samples for the Spectrolaser. It features an accurate pressure gauge, tough housing with polycaronate safety door.

Press Die Sets	The die sets are available to suit the 40mm and 32mm sample cups used with the Spectrolaser and X-Ray Fluorescence Analysis. Other sizes are available on request. Each set includes a base plate, collar and ram all made from heat hardened K110 Steel.

Sample cups	Our sample cups are 10mm deep, straight walled, coated aluminium. The 38mm cups produce a 40mm pellet, the 30mm cups produce a 32mm pellet. Other sizes are available upon request as well as tapered cups.

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