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sampling
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sampling solutions
engineeredrepresentative
samplingsystems
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principles of sampler design
All particles must have an equalchance of being sampled
No loss or contamination of thesample
Sample cutter must move at aconstant speed
Cutter blades must be sharp andstraight
Cutter must have sufficient capacityto hold the sample
Cutter opening must be constant
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linear cross stream sampler drives
< ball screw
belt drive >
samplers using chain, pneumaticor hydraulic drives always haveissues associated with potential
‘elasticity’ of oil and air and thehigh wear of chains
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typical ball screw sampler BSLS40
The installation of the
falling stream linearsampler at thedischarge end of abelt conveyor is theinternationallypreferred method of
sampling the conveyor
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ball screw linear sampler advantages
constant drive speed
electric power
rapid acceleration /deceleration
minimal maintenance
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ball screw linear cross stream sampler
Primary, secondary or
tertiary samplingapplications
Feed rate: <500 TPH
Max. belt width: 700mm
Also suitable
for slurrysampling
Model BSLS 25-1000
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ball screw linear cross stream sampler
Model BSLS 40-1800
Primary or secondarysampling applications
Feed rate: <3,000 TPH
Max. belt width: 1,400mm
Also suitablefor slurrysampling
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belt drive linear cross stream sampler
Model BDLS 80-3500
Feed rate: 7,000-
16,000 TPH
Max. belt width:2,500mm
Primary samplingapplications
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synchronous belt drive linear cross
stream sampler
Model SBD 3700
Primary samplingapplications
Feed rate: 7,000-16,000 TPH
Max. belt width:
2,000 mm
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vezin sampler
rotary cross streamsampler forprimary,
secondary ortertiary samplingfrom a falling
stream of slurry orfree flowing solids
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vezin sampler
mainproduct
flow
sample
rotatingcutter
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rotary sample collector (RSC)
an indexing carouselfor the automaticcollection and securestorage of samples
each sample
container isautomatically sealedfrom contaminationand moisture loss
ergonomic design androbust construction
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designing sampling systems
what do we need to help design a system for aclient?
material conveyor rate (TPH)
maximum particle size
sample requirements number cuts per hour/ tons sample period/ length of shift
desired sample mass at end of period
conveyor details belt width sampler location
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fines
6 mm
lump
31.5 mm
typical ship
loading
sampling
systemflowchart
primary sampler
hopper
feeder
secondary
sampler
reversible feederdiverter
hopper
feeder
tertiary
sampler
physical sample chemical sample
primary
crusher
BSLS 50/2300 flow rate = 3000 tph cutter aperture = 150 mm primary sample size = 260 kg/cut min. requirement = 1 cut/12 min.
BSLS 40/1300 feed over 5 min. effective flow rate = 3.1 tph cutter aperture = 150 mm secondary sample size = 269 g/cut take 20 cuts = 5.38 kg
Wescone 300 product = 80% < 6 mm crush time = 30 sec.
Vezin 300/2/10 1 x 10% cutter = 504 g sample
RSC 4/20
collect hourly 6.04 kg chemicalsamples= 337 kg total sample
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typical sampling station design
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Iron ore ship loading sampling
Rio Tinto, Australia
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Iron ore receiving port sampling
CIQ, China
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Steel plant sampling
ThyssenKrupp, Brasil
retrofit cross stream samplers to systemoriginally designed to accommodatecross belt samplers
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sampling slurries
the basic principle of sampling isthat all particles should have equalopportunity of being sampled
for slurries in pipes a complete cutof the stream must be made toavoid variations within the pipe
this cut can be made directly in thepipe or at a launder discharge
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pipe sampler for gravity fed slurries
slurry entry
slurry exitsample
rubberlining
samplecutter
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dual slurry
sampler
mainproductflow
primarysample
secondary
sample
primary cutter
sample agitator
secondary cutter
metering valve
cutter wash downsprays
cutter washdown sprays
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slurry “extractors”
poppet valve samplers can onlybe considered as “extractors” and
the sample should only be usedfor internal process control, neverfor metallurgical balance
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pipe sampler for pressure fed
slurriesslurry entry
mixer
sample
pneumatic actuator
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considerations when sampling slurries
allow sufficient vertical pipe height toinstall samplers... even if later
understand the value of the head,
concentrate and tails sample...only these can give you a truemetal balance.
use “extractors” and online analysisto maintain plant control but not todefine performance
i b fit f li
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46% Mn= $345/tonne
acceptable limit at46% Mn is +/- 1%
supplier can deliver product at 45.5 – 46.5%
without penalty supplier intended to supply 45.5% butactually supplied 46.5% = loss $7.50 per tonne 40,000 tonne shipment = $300,000 loss
50 shipments/year = $15 million/year risk
economic benefits of sampling
… manganese case study
sell price = $7.50/1% Mn per tonne
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how easy is it for such a loss to occur?
2 tonne composite sample is takenduring vessel loading
1 x 70 mm particle = 140 g =
0.00007 of the composite sample average grade of large
particle = 0.5% higher
than the average for theentire stream of ore
what happens if a single large particle
fails to enter the sample cutter?
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1 x single particle failing to enter thecutter would cause a bias of the gradedifference (0.5% Mn) x proportion by
which large particles were underrepresented:
0.5% Mn x 0.00007 = 0.000035% Mn
therefore, to end up with a 0.1% loss of Mn you only need 0.1/0.000035 = 2850particles or 400 kg of material lostduring sampling
how easy is it for such a loss to occur?
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since lost material
simply rejoins theproduct stream youwould never know
about it!
how easy is it for such a loss to occur?
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laboratory sampling
1. Scoop Sampling 21.0%
2. Cone & Quartering 19.2%
3. Table Sampling 7.0%
4. Riffle Splitting 3.7%
5. Rotary Sample Dividing 0.9%
I n c r e a s
i n g
a c c u r a
c y
estimated maximumsample error *
* based on a sugar-sand mixture
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manual samplers
Riffle Splitters
Mild and stainlesssteel
Laboratory unit
Field unit (multi
tiered)
Sampling Probes
Hand Slurry Samplers
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rotary sample dividers
segmental bucket typefor the accurate division of bulklaboratory samples into multiplerepresentative samples
5 L
1600 L
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rotary sample dividers
bulk batch sampling andblending systems
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rotary sample dividers
residue typeFor the accurate and representativedivision of a specific portion of bulklaboratory samples into a retained
sample while allowing the residue topass to reject
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www.essa.com.au
ASX code: ESS
The information contained in this document isprovided for promotional purposes. Essa does notwarrant its accuracy or completeness.While Essa attempts to ensure that the informationis accurate, Essa reserves the right to changefeatures or specifications at any time. Performancecharacteristics will vary depending on the
application. Please check with Essa at the time of
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