ISO 10086-2:2004

SLOVENSKI STANDARD
01-november-2005
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Coal -- Methods for evaluating flocculants for use in coal preparation -- Part 2:
Flocculants as filter aids in rotary vacuum filtration systems
Charbon -- Méthodes d'évaluation des floculants utilisés dans la préparation des
charbons -- Partie 2: Floculants comme aides à la filtration dans des systèmes rotatoires
de filtration sous vide
Ta slovenski standard je istoveten z: ISO 10086-2:2004
ICS:
73.040 Premogi Coals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 10086-2
First edition
2004-01-15
Coal — Methods for evaluating
flocculants for use in coal preparation —
Part 2:
Flocculants as filter aids in rotary
vacuum filtration systems
Charbon — Méthodes d'évaluation des floculants utilisés dans
la préparation des charbons —
Partie 2: Floculants comme aides à la filtration dans des systèmes
rotatoires de filtration sous vide

Reference number
©
ISO 2004
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©  ISO 2004
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ii © ISO 2004 – All rights reserved

Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Principle . 1
4 Apparatus. 1
5 Materials. 2
5.1 Slurry. 2
5.2 Water . 2
6 Sampling . 2
7 Preparation of flocculant solutions. 3
8 Test procedure . 3
8.1 Preliminary. 3
8.2 Procedure. 4
8.3 Calculation of flocculant dosage rate . 5
8.4 Filtration test . 6
8.5 Analysis of cake sample. 7
9 Clarity of the filtrate . 7
10 Recording of results . 8
11 Repeatability. 8
12 Test report. 8
Annex A (informative) Worked example. 9
Annex B (informative) Data recording sheet. 11
Bibliography . 12

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 Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10086-2 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee 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 rotary vacuum filtration systems

iv © ISO 2004 – All rights reserved

INTERNATIONAL STANDARD ISO 10086-2:2004(E)

Coal — Methods for evaluating flocculants for use in coal
preparation —
Part 2:
Flocculants as filter aids in rotary vacuum filtration systems
1 Scope
This part of ISO 10086 specifies a method for the comparative evaluation of the performance of flocculants
used as filter aids for rotary vacuum filtration applications on a given slurry.
2 Normative references
The following referenced documents are indispensable for the application 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 10086-1:2000, Coal — Methods for evaluating flocculants for use in coal preparation — Part 1: Basic
parameters
3 Principle
The performance of different flocculants on a given slurry is determined by measuring the cake yield and
moisture content.
A flocculant solution is added to an aliquot of slurry in a beaker. A filter leaf is then applied to the flocculated
sample and the cake thus produced on the apparatus is weighed wet, dried and reweighed. A measure of the
efficiency of the flocculant is obtained from the cake yield and moisture content.
4 Apparatus
Ordinary laboratory apparatus and the following.
NOTE The apparatus is generally arranged as shown in Figure 1.
4.1 Laboratory vacuum pump or piped vacuum system, capable of producing a vacuum better than that
proposed for the plant equipment.
4.2 Vacuum gauge
4.3 Two-way valves, of at least 2 mm to 3 mm bore, manufactured in glass or plastics.
4.4 Buchner flask, with a minimum volume of 1 L.
4.5 Filter-leaf apparatus, consisting of a drainage plate and filter cloth in an assembly, as shown in
Figure 4.
4.6 Vacuum tubing and glass/plastics tubing
4.7 Stirrers, motorized variable-speed stirrers, capable of speeds up to 1 000 r/min, one for flocculant
preparation and one for sample homogenization.
4.8 Syringes, having capacities of 1 ml, 2 ml, 5 ml, 10 ml and 50 ml.

Key
1 vacuum pump/source 5 two-way valve
2 vacuum gauge 6 filter leaf
3 two-way valve 7 slurry in 800 mL beaker
4 buchner flask 8 vacuum tubing
Figure 1 — Laboratory vacuum filter-leaf apparatus
5 Materials
5.1 Slurry
The slurry for evaluation shall be collected and divided by the method described in ISO 10086-1. The contents
of each test cylinder shall then be poured into an 800 ml beaker for evaluation.
5.2 Water
The water used for the preparation of flocculant solutions shall be collected by the method described in
ISO 10086-1.
6 Sampling
The flocculant samples should be collected according to the recommendations described in ISO 10086-1.
2 © ISO 2004 – All rights reserved

7 Preparation of flocculant solutions
The flocculant, both powder and liquid grades, shall be prepared in accordance with the methods specified in
ISO 10086-1.
8 Test procedure
8.1 Preliminary
The test procedure shall simulate the operating conditions of a rotary vacuum filter on a plant (see Figures 2
and 3). Where the slurry is taken from a plant using such equipment, the immersion and drying times in the
test procedure shall be the same as on the plant equipment. Where these times are not known, or where no
vacuum filtration system exists, the following times shall apply:
 immersion time: 1 min 10 s;
 drying time: 2 min.
Key
1 filter bowl
2 filter drum
3 filter cloth
4 filter cake
5 filter cake
a
Filter leaf.
b
Slurry in 800 mL beaker.
c
Vacuum tubing.
Figure 2 — Diagram to show the immersion, drying and discharge sequences of a rotary vacuum drum
filter
Key
1 filter cake discharge chute
2 filter bowl
3 disk filter
4 filter cake
5 cake discharge
a
Immersion.
b
Drying.
c
Discharge.
Figure 3 — Diagram to show the immersion, drying and discharge sequences of a rotary vacuum disc
filter
8.2 Procedure
Prepare a 500 ml subsample of the slurry as described in ISO 10086-1. Place one subsample in an 800 ml
beaker and homogenize the slurry for 1 min using the laboratory stirrer at a speed sufficient to create a vortex.
Using a syringe, add the desired quantity of flocculant solution (see 8.3) to the surface of the slurry in the
beaker and mix well by stirring until completely conditioned.
Record the conditioning time.
Excessive mixing should be avoided, to prevent degradation of the flocculant.
4 © ISO 2004 – All rights reserved

8.3 Calculation of flocculant dosage rate
8.3.1 Calculation of content of the flocculant solution
Mass of water in the beaker = m
W
Mass of flocculant dissolved in the water = m
F
Therefore, the content of the flocculant solution w is given by:
F
m
F
w = , in grams of flocculant per gram of water
F
m
W
For the purpose of this calculation, it is assumed that a volume of 1 ml of flocculant solution weighs 1 g.
8.3.2 Calculation of the quantity of solids in the test cylinder
Volume of slurry suspension used in the test cylinder (V ) = 500 ml (= 0,5 L)
S
−1 −1
Solids concentration in the slurry, in g ⋅ L (c ) = c (g ⋅ L )
S S
Therefore, the mass of the solids in 500 ml of slurry = 0,5 × c (g)
S
−3
= 0,5 × 10 c kg of dry solids
S
8.3.3 Calculation of flocculant dosage rate
Volume of flocculant solution used to dose a slurry suspension in the cylinder = V ml
F
= V g
F
m
F
The mass of the flocculant used in the test cylinder = ×V g
F
m
W
NOTE It is approximated that 1 ml of flocculant weighs 1 g.
The flocculant dosage rate is given by:
Mass of flocculant used : Mass of solids in the cylinder
m
−3
F
=×Vc:0,5×10
FS
m
W
mV×
FF
=×2 000 g of flocculant per kg of dry solids
mc×
WS
The units of the dosage rate may also be expressed as “kg of flocculant per tonne of dry solids”.
8.3.4 Worked example
Mass of w
...