The samplers will provide a continuous sample to the online particle
size analyser (PSI) and X-ray fluorescence (XRF) analysers. PSI
analysers require 100 litres per minute, while XRF analysers require 100
to 300 litres/min.
According to Nyokong, the unique single-stage vezin sampler and
double-stage ‘Two In One’ metallurgical accounting samplers will collect
representative final composite sample sizes of less than 20 litres per
shift from streams ranging from 80 NB to 700 NB inlet-correct.
Nyokong emphasises the importance of metallurgical accounting in
ensuring that AMIRA standards and best practice are being applied in the
plant’s sampling applications. “The metallurgical plant needs to ensure
that samples collected from metallurgical accounting samplers are
representative of the whole shift operation and are used for accurate
metal accounting balances,” he says.
The benefit of the total sampling solution supplied by Multotec is to
have both a process control sampler and a metallurgical accounting
sampler in the same stream. Process control samplers are specimen
takers, providing samples that are used for real time process control
purposes.
The ‘Two in One’ metallurgical accounting sampler comprises two
separate sample units in one, with a primary and a secondary sampler
unit assembled into a compact unit allowing for a net plug and play
solution. The design allows easy access, as the primary cutter can be
inspected through a bolted hatch on the top and side of the housing. The
secondary cutters can also be inspected with ease, through an
inspection cover on the top of the secondary housing.
An advantage is that the sampler cutter of the primary unit cuts the
full stream of the slurry at constant speed with sufficient volume to
collect the sample, minimising sampling extraction and delimitation
errors. The sampled slurry then reports to the secondary vezin sampler
where the four cutters cut the full stream of the primary sample.
The picture shows a primary slurry sampler complete with a 450 steel
angle, 304 stainless cutter to allow free flow of sample increments,
minimising sample extraction error.