ISO/FDIS 8858-2

Coal — Froth flotation testing — Part 2: Sequential evaluation

ISO 8858-2:2004 sets out a laboratory sequential procedure for the froth flotation testing of fine coal, e.g. coal having a particle size of less than 0,5 mm. The procedure provides a means of evaluating for a coal the flotation characteristics (expressed as a yield/ash relationship) that may be expected from the froth flotation process. Pulp samples that cannot be dewatered without the use of heat or chemical additives are not covered by this part of ISO 8858; nor does it cover procedures for the investigation of flotation kinetics. The test is not intended to provide plant design data.

Charbon — Essais de flottation — Partie 2: Évaluation séquentielle

General Information

• Status: Not Published
• 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: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 11-Jun-2024
• Completion Date: 11-Jun-2024

Relations

• Revises: ISO 8858-2:2004 - Hard coal — Froth flotation testing — Part 2: Sequential evaluation
• Effective Date: 14-Oct-2023

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 27/SC 1
Coal — Froth flotation testing —
Secretariat: SA
Part 2:
Voting begins on:
2024-06-11
Sequential evaluation
Voting terminates on:
2024-08-06
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 27/SC 1
Coal — Froth flotation testing —
Secretariat: SA
Part 2:
Voting begins on:
Sequential evaluation
Voting terminates on:
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
ISO/FDIS 8858-2:2024(en)
Contents  Page
Foreword .iv
Introduction .v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Principle . 1
5  Sample . 2
6  Apparatus . 2
7  Flotation conditions . 2
7.1 Collector dosage .2
7.2 Frother dosage .2
7.3 Solids content . .2
7.4 Air flow rate .2
7.5 Test temperature .3
8  Procedure . 3
8.1 Initial procedure .3
8.2 Initial separation .3
8.3 Subsequent separations.3
8.4 Analysis of concentrate and tailings .3
9  Calculation of results . 4
10  Test report . 4
Annex A (informative)  Worked example of calculation of results . 6
Annex B (informative)  Presentation of results .11
Bibliography .15

iii
ISO/FDIS 8858-2:2024(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 27, Coal and Coke, Subcommittee SC 1, Coal
preparation: Terminology and performance.
This second edition cancels and replaces the first edition (ISO 8858-2 2004), of which it constitutes a minor
revision. The changes are as follows:
— updated title;
— document updated according to current ISO drafting rules.
A list of all parts in the ISO 8858 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/FDIS 8858-2:2024(en)
Introduction
The froth flotation of coal has a widespread application for the recovery of fine coal particles and their
separation from unwanted mineral matter. The response of coal to the froth flotation process is measured
initially by a laboratory scale test. ISO 8858-1 provides a means of evaluating the general flotation
characteristics of a coal under a set of specified conditions and will not necessarily indicate the full potential
of that coal. It is accepted that variation of the many parameters in the froth flotation process can be used
to effect the beneficiation of the product. This document describes a procedure for the more complete
determination of the flotation characteristics of a coal, using the apparatus and basic procedures described
in ISO 8858-1. The purpose of this extended procedure is to provide information similar to that provided
by the sink/float curve, which is the basis for density separations. The data obtained are expressed as a
yield/ash curve. The information can be used to define the limitations on the cleaning of fine coal by froth
flotation.
The procedures specified in this document are of practical significance in the development and evaluation of
coal-preparation-plant flotation circuits, although engineering design aspects, such as flotation kinetics and
the selection of size and type of cell, are not addressed.
The flotation response curve (yield/ash) indicates the maximum possible yield at any specified ash content.
The general shape of the curve indicates the sensitivity of flotation performance to the nature of the coal
and to operating conditions.
The procedure may be modified to test and compare the performance of different frother and collector
types, the assessment of liberation by grinding, and the comparison of alternative feed size ranges. However,
results of such tests should clearly indicate any use of non-standard procedures.

v
FINAL DRAFT International Standard ISO/FDIS 8858-2:2024(en)
Coal — Froth flotation testing —
Part 2:
Sequential evaluation
1  Scope
This document sets out a laboratory sequential procedure for the froth flotation testing of fine coal, e.g.
coal having a particle size of less than 0,5 mm. The procedure provides a means of evaluating the flotation
characteristics for coal (expressed as a yield/ash relationship) that can be expected from the froth flotation
process.
This document does not apply to pulp samples that cannot be dewatered without the use of heat or chemical
additives. This document does not apply to procedures for the investigation of flotation kinetics.
The test is not intended to provide plant design data.
This document is intended to be read in conjunction with ISO 8858-1.
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 589, Hard coal — Determination of total moisture
ISO 1171, Solid mineral fuels — Determination of ash
ISO 1213-1, Coal and coke — Vocabulary — Part 1: Terms relating to coal preparation
ISO 1953, Hard coal — Size analysis by sieving
ISO 8858-1, Hard coal — Froth flotation testing — Part 1: Laboratory procedure
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1213-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4  Principle
A sequence of laboratory flotation tests is carried out on a single coal sample, using a procedure based on
that described in ISO 8858-1. Variations on that procedure are made to generate a number of products, by
refloating concentrates and tailings a number of times. The masses and ash mas fractions of the various
products are used to construct a yield/ash curve showing the flotation response.

ISO/FDIS 8858-2:2024(en
...

INTERNATIONALSSTISO/FDIS
ANDARD 8858-2
First edition
2004-08-15
Coal —Froth flotation testing —
Part 2:
Sequential evaluation
Houille — Essais de flottation —
Partie 2: Évaluation séquentielle

Reference number
Title:
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ISO/TC 27/SC 1
Secretariat: SA
Date: 2024-05-28
Coal — Froth flotation testing —
Part 2:
Sequential evaluation
FDIS stage
Reference number
Title:
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ISO 8858-2:2004(E)ISO/FDIS 8858-2:2024(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
iii
iii
ISO 8858-2:2004(E)XXISO/FDIS 8858-2:2024(en)
Contents Page
Foreword . vi
Introduction . viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Sample . 2
6 Apparatus . 2
7 Flotation conditions . 2
7.1 Collector dosage . 2
7.2 Frother dosage . 3
7.3 Solids content . 3
7.4 Air flow rate . 3
7.5 Test temperature . 3
8 Procedure . 3
8.1 Initial procedure . 3
8.2 Initial separation . 3
8.3 Subsequent separations . 4
8.4 Analysis of concentrate and tailings . 4
9 Calculation of results . 4
10 Test report . 6
Annex A (informative) Worked example of calculation of results . 7
A.1 Scope . 7
A.2 Procedure . 7
A.3 Test results . 9
A.4 Calculations . 9
Annex B (informative) Presentation of results . 14
B.1 Tabulated data . 14
B.2 Graphical presentation . 14
Bibliography . 2

Foreword iii
Introduction iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
iv
iv
ISO 8858-2:2004(E)ISO/FDIS 8858-2:2024(en)
5 Sample . 2
6 Apparatus . 2
7 Flotation conditions . 2
7.1 Collector dosage . 2
7.2 Frother dosage . 3
7.3 Solids content . 3
7.4 Air flow rate . 3
7.5 Test temperature . 3
8 Procedure . 3
8.1 Initial procedure . 3
8.2 Initial separation . 3
8.3 Subsequent separations . 3
8.4 Analysis of concentrate and tailings . 4
9 Calculation of results . 4
10 Test report . 5
Annex A (informative) Worked example of calculation of results . 6
Annex B (informative) Presentation of results . 11

v
v
ISO 8858-2:2004(E)XXISO/FDIS 8858-2:2024(en)
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 drawnThe procedures used to develop this document and those intended for its further
maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of ISO document should be noted. This document was drafted in accordance
with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that some of the elementsimplementation of this document may
beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence, validity or
applicability of any claimed patent rights. in respect thereof. As of the date of publication of this document,
ISO had not received notice of (a) patent(s) which may be required to implement this document. However,
implementers are cautioned that this may not represent the latest information, which may be obtained from
the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or
all such patent rights.
ISO 8858-2Any trade name used in this document is information given for the convenience of users and does
not constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 27, Coal and Coke, Subcommittee SC 1, Coal
preparation: Terminology and performance.
This second draft edition cancels and replaces the first draft edition (ISO 8858-2 2004 and is), of which it
constitutes a minor revision. The changes are as follows:
Changes include update— updated title;
— document updated according to current ISO drafting rules.
A list of name of Standardall parts in line with renaming Standards either Coal or Coke.

the ISO 8858 consists of the following parts, underseries can be found on the general title Hard coal — Froth
flotation testing:ISO website.
vi
vi
ISO 8858-2:2004(E)ISO/FDIS 8858-2:2024(en)
⎯ Part 1: Laboratory procedure
⎯ Part 2: Sequential evaluation
⎯ Part 3: Release evaluation
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
vii
vii
ISO 8858-2:2004(E)XXISO/FDIS 8858-2:2024(en)
Introduction
The froth flotation of coal has a widespread application for the recovery of fine coal particles and their
separation from unwanted mineral matter. The response of coal to the froth flotation process is measured
initially by a laboratory scale test. ISO 8858--1:1990 provides a means of evaluating the general flotation
...