ISO 10086-1:2019

Coal - Methods for evaluating flocculants for use in coal preparation - Part 1: Basic parameters

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.

Charbon — Méthodes d'évaluation des floculants utilisés dans la préparation des charbons — Partie 1: Paramètres de base

General Information

• Status: Published
• Publication Date: 23-Jun-2019
• ICS: 73.040 - Coals
• Technical Committee: ISO/TC 27/SC 1 - Coal preparation: Terminology and performance
• Drafting Committee: ISO/TC 27/SC 1 - Coal preparation: Terminology and performance
• Current Stage: 9093 - International Standard confirmed
• Start Date: 08-Jan-2025
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 22721:2023 - Conveyor belts - Specification for rubber- or plastics-covered conveyor belts of textile construction for underground mining
• Effective Date: 06-Jun-2022
• Revises: ISO 10086-1:2000 - Coal - Methods for evaluating flocculants for use in coal preparation - Part 1: Basic parameters
• Effective Date: 07-Jul-2018
• Revised: ISO 10086-2:2004 - Coal - Methods for evaluating flocculants for use in coal preparation - Part 2: Flocculants as filter aids in rotary vacuum filtration systems
• Effective Date: 26-May-2018

Overview

ISO 10086-1:2019 - "Coal - Methods for evaluating flocculants for use in coal preparation - Part 1: Basic parameters" defines a laboratory method for the comparative evaluation of flocculants used in coal preparation. The standard specifies how to test flocculant performance on a given slurry by measuring initial settling velocity, sediment volume after compaction/consolidation, and clarity of the supernatant liquid. This second edition (2019) is a minor revision of the original 2000 edition and is intended for use by laboratories and process engineers in coal preparation plants.

Key topics and technical requirements

• Scope and principle
  • Comparative evaluation of flocculants for clarification, thickening and sedimentation.
  • Performance determined from relative settling rates and supernatant clarity.
• Sampling and materials
  • Slurry sampling: at least 10 increments over ≥2 hours to yield ≥50 L; store at 20 °C ± 2 °C and use within 24 h.
  • Determine solids concentration (drying at 105 °C), particle size and ash content per referenced methods.
• Apparatus
  • Typical lab equipment: variable-speed stirrers, 500 ml graduated cylinders (plastic or glass), syringes, timer and a clarity wedge.
• Flocculant preparation
  • Procedures for powder and liquid flocculants, preparation of stock solutions and recommended storage/use windows (use within 24 h).
• Test procedures
  • Preparation and homogenization of test subsamples (500 ml).
  • Addition of flocculant, mixing (avoid overmixing), and measurement of settling:
    • Free settling rate: time for interface to fall from 450 ml to 250 ml; convert to m/h.
    • Full settling curve: monitor interface at each 25 ml subdivision to derive maximum average settling rate.
  • After 30 minutes measure settled sediment volume and evaluate supernatant clarity with a clarity wedge.
• Calculations and reporting
  • Flocculant concentration and dosage rate calculations, repeatability guidance and test report requirements are included.

Applications and users

• Who uses it:
  • Coal preparation plant operators, process engineers, laboratory analysts, product development teams and suppliers of flocculants.
• Practical uses:
  • Select and dose flocculants for improved clarification, thickening and tailings handling.
  • Compare alternative polymers/emulsions/solids for sedimentation performance.
  • Support process optimization, environmental control (clarity of discharged water) and product selection.

Related standards

• ISO 1171 - Solid mineral fuels - Determination of ash
• ISO 1953 - Hard coal - Size analysis by sieving

Keywords: ISO 10086-1:2019, flocculants, coal preparation, settling rate, sedimentation, clarification, thickening, slurry testing, flocculant evaluation.

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
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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see www. iso .org/iso/foreword. html.
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.
A list of all parts in the ISO 10086 series can be found on the ISO website.
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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 th
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