AS 29171-1994 Copper sulfide concentrates Determination of copper content - Titrimetric methods

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					                                                                                                                              AS 2917.1—1994
                                                                                                                              ISO 10258:1994




                                                                                           Australian Standard®
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                                                                                           Copper sulfide concentrates

                                                                                           Part 1: Determination of copper
                                                                                           content—Titrimetric methods

                                                                                           [ISO title: Copper sulfide concentrates—Determination of copper
                                                                                           content—Titrimetric methods]
                                                                                           This Australian Standard was prepared by Committee MN/5, Copper, Lead, Zinc, Gold
                                                                                           and Silver Ores and Concentrates. It was approved on behalf of the Council of
                                                                                           Standards Australia on 2 September 1994 and published on 5 December 1994.
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                                                                                           The following interests are represented on Committee MN/5:
                                                                                               Australasian Institute of Mining and Metallurgy
                                                                                               Australian Lead Development Association
                                                                                               Australian Mining Industry Council
                                                                                               CSIRO, Division of Mineral and Processing Engineering




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                                                                                           important therefore that Standards users ensure that they are in possession of the latest editi on, and any
                                                                                           amendments thereto.
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                                                                                           Standard’, which subscribing members receive, and which gives details of new publications, new editi ons
                                                                                           and amendments, and of withdrawn Standards.
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                                                                                                                                  AS 2917.1—1994




                                                                                           Australian Standard®
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                                                                                           Copper sulfide concentrates

                                                                                           Part 1: Determination of copper
                                                                                           content—Titrimetric methods




                                                                                            First published as AS 2917.1— 1986.
                                                                                            Second edition 1994.




                                                                                           PUBLISHED BY STANDARDS AUSTRALIA
                                                                                           (STANDARDS ASSOCIATION OF AUSTRALIA)
                                                                                           1 THE CRESCENT, HOMEBUSH, NSW 2140
                                                                                                                                       ISBN 0 7262 9275 3
                                                                                                                                                              ii


                                                                                                                                                       PREFACE

                                                                                           This Standard was prepared by the Standards Australia Committee MN/5 on Copper, Lead, Zinc, Gold
                                                                                           and Silver Ores and Concentrates as part of a programme of standardizing methods for the
                                                                                           determination of elements of commercial interest in such materials. It supersedes AS 2917.1— 1986,
                                                                                           Methods for the analysis of copper sulphide concentrates , Part 1: Determination of copper (short iodide
                                                                                           titrimetric method).
                                                                                           The objective of this Standard is to provide those involved in the analysis of copper sulfide concentrates
                                                                                           with a standardized method of determining copper content supported by precision data obtained from
                                                                                           an inter-laboratory test programme.
                                                                                           It is identical with and has been reproduced from ISO 10258 which has been prepared by ISO/TC 183
                                                                                           Copper, Lead and Zinc Ores and Concentrates. Australia holds the Chairmanship and Secretariat of
                                                                                           ISO/TC 183 and has made a significant contribution to the preparation of ISO 10258.
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                                                                                           As this Standard is reproduced from an international Standard, the following applies:
                                                                                           (a)     Its number does not appear on each page of text and its identity is shown only on its cover and
                                                                                                   title page.
                                                                                           (b)     In the source text, ‘this international Standard’ should read ‘this Australian Standard’.
                                                                                           (c)     A full point substitutes for a comma when referring to a decimal point.
                                                                                           References to international Standard ISO 9599 should be replaced by equivalent Australian Standard
                                                                                           AS 2816, as follows:
                                                                                           Reference to International Standard                                     Australian Standard

                                                                                           ISO                                                                     AS
                                                                                           9599    Copper, lead and zinc sulfide                                   2816   Copper, lead and zinc sulfide
                                                                                                   concentrates—Determination of                                          concentrates—Determination of
                                                                                                   hygroscopic moisture in the analysis                                   hygroscopic moisture in the analysis
                                                                                                   sample — Gravimetric method                                            sample — Gravimetric method




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                                                                                                payment provided such programs are used exclusively in-house by the creators of the programs.
                                                                                             Care should be taken to ensure that materi al used is from the current edit ion of the Standard and that it is updated whenever the
                                                                                             Standard is amended or revised. The number and date of the Standard should therefore be clearly identif ied.
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                                                                                                                                              iii


                                                                                                                                     CONTENTS
                                                                                                                                                                                              Page
                                                                                           1    Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    1
                                                                                           2    Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           1
                                                                                           3    Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    1
                                                                                           4    Reagents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1
                                                                                           5    Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3
                                                                                           6    Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     3
                                                                                           7    Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3
                                                                                           8    Expression of results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          6
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                                                                                           9    Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    6
                                                                                           10   Test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      8
                                                                                           Annexes
                                                                                           A    Procedure for the preparation and determination of the mass of a
                                                                                                predried test portion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
                                                                                           B    Flowsheet of the procedure for the acceptance of analytical values for
                                                                                                test samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
                                                                                           C    Derivation of precision equations . . . . . . . . . . . . . . . . . . . . . . . .                 12
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                                                                                                   iv

                                                                                           NOTES
                                                                                                                                                       1

                                                                                           AUSTRALIAN STANDARD


                                                                                           Copper sulfide concentrates — Determination of
                                                                                           copper content — Titrimetric methods
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                                                                                           1   Scope                                                       3     Principle


                                                                                           This International Standard specifies two titrimetric           3.1    Method 1 (Long iodide method)
                                                                                           methods for the determination of the copper content of
                                                                                           copper sulfide concentrates in the range 15 % (m/m) to          A test portion is decomposed in nitric and sulfuric
                                                                                           50 % (m/m), using sodium thiosulfate after separation           acids, and arsenic, antimony and tin are removed by
                                                                                           (method 1) or without separation (method 2) of copper           treatment with hydrobromic acid. Copper is separated
                                                                                           from interfering elements.                                      from interfering elements by precipitation of copper
                                                                                                                                                           sulfide with sodium thiosulfate. The precipitate is dis-
                                                                                                                                                           solved in nitric and sulfuric acids, ammonium hydrogen
                                                                                           2   Normative references                                        difluoride is added to eliminate interference of residual
                                                                                                                                                           iron, and excess potassium iodide is also added. Free
                                                                                           The following standards contain provisions which,               iodine isolated by reaction between iodide ions and
                                                                                           through reference in this text, constitute provisions of        copper(II) ions is titrated with sodium thiosulfate using
                                                                                           this International Standard. At the time of publication,        soluble starch as the indicator.
                                                                                           the editions indicated were valid. All standards are
                                                                                           subject to revision, and parties to agreements based on
                                                                                           this International Standard are encouraged to investi-          3.2    Method 2 (Short iodide method)
                                                                                           gate the possibility of applying the most recent editions
                                                                                           of the standards indicated below. Members of IEC and            A test portion is decomposed in nitric and sulfuric
                                                                                           ISO maintain registers of currently valid International         acids, and arsenic, antimony and tin are removed by
                                                                                           Standards.                                                      treatment with hydrobromic acid. Ammonium hydrogen
                                                                                                                                                           difluoride is added to eliminate interference of iron, and
                                                                                           ISO 385-1:1984, Laboratory glassware — Burettes —               excess potassium iodide is also added. Free iodine
                                                                                           Part 1: General requirements.                                   isolated by reaction between iodide ions and copper(II)
                                                                                                                                                           ions is titrated with sodium thiosulfate using soluble
                                                                                           ISO 648:1977, Laboratory glassware — One-mark                   starch as the indicator.
                                                                                           pipettes.

                                                                                           ISO 1042:1983, Laboratory glassware — One-mark
                                                                                           volumetric flasks.                                              4     Reagents

                                                                                           ISO 4787:1984, Laboratory glassware — Volumetric                During the analysis, use only reagents of recognized
                                                                                           glassware — Methods for use and testing of capacity             analytical grade and distilled water or water of equiva-
                                                                                                                                                           lent purity.
                                                                                           ISO 9599:1991, Copper, lead and zinc sulfide con-
                                                                                           centrates — Determination of hygroscopic moisture in            4.1    Copper metal, minimum purity 99,99 %.
                                                                                           the analysis sample — Gravimetric method.
                                                                                                                                                           4.2    Potassium iodide.
                                                                                           ISO Guide 35:1985, Certification of reference ma-
                                                                                           terials — General and statistical principles.                   4.3    Ammonium hydrogen difluoride.




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                                                                                                             AS 2917.1-1994, Copper sulfide concentrates
                                                                                                             Determination of copper content - Titrimetric
                                                                                                             methods
This is a free 7 page sample. Access the full version at http://infostore.saiglobal.com.




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