ISO 10086-1:2000

SLOVENSKI STANDARD
SIST ISO 10086-1:2002
01-januar-2002
Premog - Metode vrednotenja flokulantov pri pripravi premoga - 1. del: Osnovni
parametri
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
Ta slovenski standard je istoveten z: ISO 10086-1:2000
ICS:
73.040 Premogi Coals
SIST ISO 10086-1:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 10086-1:2002

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SIST ISO 10086-1:2002
INTERNATIONAL ISO
STANDARD 10086-1
First edition
2000-06-15
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 10086-1:2000(E)
© ISO 2000

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SIST ISO 10086-1:2002
ISO 10086-1:2000(E)
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ii ISO 2000 – All rights reserved

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SIST ISO 10086-1:2002
ISO 10086-1:2000(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 1
5 Materials . 2
6 Sampling . 3
7 Preparation of flocculant solutions . 3
8 Procedure . 4
9 Calculation of results . 5
10 Recording of results . 6
11 Repeatability . 6
12 Test report . 6
Annexes
A Worked example . 8
B Data recording sheets. 11
B.1 Free-settling rate . 11
B.2 Full settling curve . 12
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SIST ISO 10086-1:2002
ISO 10086-1:2000(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commis-
sion (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 10086 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 10086-1 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels,Subcom-
mittee SC 1, Coal preparation: Terminology and performance.
ISO 10086 consists of the following parts, under the general title Coal — Methods for evaluating flocculants for use
in coal preparation:
— Part 1: Basic parameters
— Part 2: Flocculants as filter aids in vacuum filtration
Annexes A and B of this part of ISO 10086 are for information only.
©
iv ISO 2000 – All rights reserved

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SIST ISO 10086-1:2002
INTERNATIONAL STANDARD ISO 10086-1:2000(E)
Coal — Methods for evaluating flocculants for use in coal
preparation —
Part 1:
Basic parameters
1 Scope
This part of ISO 10086 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,
c) the clarity of the supernatant liquid.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 10086. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 10086 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated references,
the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of
currently valid International Standards.
ISO 1171, Solid mineral fuels — Determination of ash.
ISO 1953, Hard coal — Size analysis by sieving.
3 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.
4Apparatus
Usual laboratory apparatus, and
4.1 Stirrers, two variable-speed motorized stirrers capable of 1 000 r/min (one for flocculant preparation and one
for sample homogenization).
4.2 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� 2ml, graduated in 5ml 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.
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SIST ISO 10086-1:2002
ISO 10086-1:2000(E)
A vertical scale may be attached to or mounted beside the cylinder, with the zero point coinciding with the 5ml mark
of the cylinder.
4.3 Syringes, having nominal capacities of 1ml, 2ml, 5ml, 10ml and 50ml.
4.4 Timer, capable of reading 0,1 s to a total of 10 000 s.
4.5 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:4mm
2 Suspension level
Figure 1 — Clarity wedge
5Materials
5.1 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 2h of stable
operating conditions, to give a total sample volume of 50 litres or more.
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SIST ISO 10086-1:2002
ISO 10086-1:2000(E)
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 1h intervals in the oven.
The collected sample is divided into representative 500 ml subsamples as follows.
a) Mix the slurry using a motorized stirrer (4.1) 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 (4.2). 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.
5.2 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.
6 Sampling
Flocculants are available in the forms of powder, emulsion, dispersion or solution. In this part of ISO 10086,
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 ke
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