ISO 10086-1:2019

INTERNATIONAL ISO
STANDARD 10086-1
Second edition
2019-07
Coal — Methods for evaluating
flocculants for use in coal
preparation —
Part 1:
Basic parameters
Charbon — Méthodes d'évaluation des floculants utilisés dans la
préparation des charbons —
Partie 1: Paramètres de base
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Materials . 3
6.1 Slurry . 3
6.2 Water . 3
7 Sampling . 3
8 Preparation of flocculant solutions . 3
8.1 Powder flocculants . 3
8.2 7.2 Liquid flocculants . 4
9 Procedure. 4
9.1 Preparation of test sample . 4
9.2 Determination of settling rate . 4
9.2.1 Free settling rate . 4
9.2.2 Full settling curve . 5
9.3 Determination of sediment height and supernatant clarity . 5
10 Calculation of results . 5
10.1 Flocculant dosage rate . 5
11 Recording of results . 6
12 Repeatability . 6
13 Test report . 6
Annex A (informative) Worked example . 8
Annex B (informative) Data recording sheets .11
Foreword
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This document was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee
SC 1, Coal preparation: Terminology and performance.
This second edition cancels and replaces the first edition (ISO 10086-1:2000), of which it
constitutes a minor revision.
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iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 10086-1:2019(E)
Coal — Methods for evaluating flocculants for use in coal
preparation —
Part 1:
Basic parameters
1 Scope
This document specifies a method for the comparative evaluation of the performances of flocculants
for clarification, thickening and sedimentation applications on a given slurry. This performance can be
evaluated by
a) the settling velocity in the initial period,
b) the sediment volume after compaction and consolidation, and
c) the clarity of the supernatant liquid.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1171, Solid mineral fuels — Determination of ash
ISO 1953, Hard coal — Size analysis by sieving
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Principle
The performance of different flocculants on a given slurry is determined by measuring the relative
settling rates.
A flocculant solution is added to an aliquot of the slurry in a measuring cylinder and the formation of
an interface between the supernatant liquid and the suspension is observed. An initial settling rate is
calculated and is plotted against flocculant dosage to evaluate the performance of the flocculant.
5 Apparatus
Usual laboratory apparatus, and
5.1 Stirrers, two variable-speed motorized stirrers capable of 1 000 r/min (one for flocculant
preparation and one for sample homogenization).
5.2 Plastic moulded cylinders, of capacity 500 ml, graduated in 5 ml scale divisions and having
rubber stoppers. Where these are not available, glass cylinders, of capacity 500 ml ± 2 ml, graduated
in 5 ml scale divisions and having ground-glass stoppers, may be a satisfactory alternative. However,
differences in settling rates may result, because of differences in the graduated height.
A vertical scale may be attached to or mounted beside the cylinder, with the zero point coinciding with
the 5 ml mark of the cylinder.
5.3 Syringes, having nominal capacities of 1 ml, 2 ml, 5 ml, 10 ml and 50 ml.
5.4 Timer, capable of reading 0,1 s to a total of 10 000 s.
5.5 Clarity wedge, as shown in Figure 1, having a scale in black numbers on a white background (or
vice versa) printed inside the back.
Dimensions in millimetres, not to scale
Key
1 transparent plastic sides and front
wall thickness: 4 mm
2 suspension level
Figure 1 — Clarity wedge
2 © ISO 2019 – All rights reserved

6 Materials
6.1 Slurry
Flocculant evaluation shall be carried out on a slurry collected from the coal preparation plant and free
from flocculant contamination. The sample shall be collected in at least 10 increments over a minimum
of 2 h of stable operating conditions, to give a total sample volume of 50 l or more.
The sample shall be collected in a container that is inert to the slurry and stored in a suitable
environment that maintains a temperature of 20 °C ± 2 °C. Storage may affect the characteristics of the
sample and, hence, affect the relative performance of the flocculants. Therefore, the sample shall be
used as soon as possible, but not later than 24 h after collection.
A size analysis and ash determination shall be performed on the solids in the sample using the methods
given in and respectively.
The concentration of solids in the slurry, in grams per litre on a dry basis, shall also be determined,
by drying the sample in an oven at 105 °C to constant mass, which is defined as the point at which two
consecutive weighings do not differ by more than 5 % after 1 h intervals in the oven.
The collected sample is divided into representative 500 ml subsamples as follows.
a) Mix the slurry using a motorized stirrer (5.1) to ensure homogeneity of the sample.
b) While the sample is being stirred, dip a beaker of capacity 50 ml into the slurry and fill it. Pour
this sample into the first cylinder (5.2). Repeat the procedure, adding to each cylinder in a cyclic
pattern, until sufficient test cylinders for complete test work are filled to the 500 ml mark.
6.2 Water
Prepare the flocculant solution using water that is used in the plant, where this is available.
Where plant water is not available, use potable or fresh water. Collect sufficient water for all of the
flocculants being tested.
If flocculants are not currently being used by the plant, careful consideration should be given to a
suitable source of water.
7 Sampling
Flocculants are available in the forms of powder, emulsion, dispersion or solution. In this document,
emulsion, dispersion and solution flocculants are referred to as liquid flocculants. Recommendations
are as follows:
a) Flocculants should be obtained as fresh samples and should be discarded after six months.
b) Store all flocculant samples at ambient temperature, away from direct sunlight and heat, and keep
solid flocculant samples away from moisture.
c) Avoid unnecessarily opening and closing of the sample container.
d) Take a sufficient quantity of flocculant sample for all of the tests to be carried out.
8 Preparation of flocculant solutions
8.1 Powder flocculants
Homogenize the bulk portion of the flocc
...