SIST ISO 312:2001

Manganese ores -- Determination of active oxygen content, expressed as manganese dioxide -- Titrimetric method

This third edition cancels and replaces the second edition (ISO 312-1980), of which it constitutes a minor revision. Specifies principle, reagents, apparatus, sample, procedure and expression of results. A figure gives an example of apparatus.

Minerais de manganèse -- Dosage de l'oxygène actif, exprimé en dioxyde de manganèse -- Méthode titrimétrique

La présente Norme internationale spécifie une méthode titrimétrique de dosage par réduction au sulfate double d'ammonium fer(II) hexahydraté, de l'oxygène actif (exprimé conventionnellement en dioxyde de manganèse) dans les minerais de manganèse.

Manganove rude - Določevanje aktivnega kisika, izraženega kot manganov dioksid - Titrimetrijska metoda

General Information

• Status: Published
• Publication Date: 31-May-2001
• ICS: 73.060.20 - Manganese ores
• Technical Committee: IRUD - Mining
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jun-2001
• Due Date: 01-Jun-2001
• Completion Date: 01-Jun-2001
• Ref Project: ISO 312:1986 - Manganese ores - Determination of active oxygen content, expressed as manganese dioxide - Titrimetric method

Relations

• Revised: ISO 312:1980 - Manganese ores - Determination of active oxygen content, expressed as manganese dioxide - Volumetric method
• Effective Date: 12-May-2008

Overview

ISO 312:1986 specifies a titrimetric method for determining the active oxygen content of manganese ores, expressed conventionally as manganese dioxide (MnO2). This third edition (1986) is a minor revision that cancels and replaces the 1980 edition. The standard defines the principle, reagents, apparatus, sample requirements, analytical procedure and expression of results, and includes an illustrative figure of the apparatus.

Key topics and technical requirements

• Analytical principle: Reduction of MnO2 in the ore by an excess of ammonium iron(II) sulfate in sulfuric acid, followed by back-titration of the excess Fe(II) with standard potassium dichromate (K2Cr2O7) using sodium diphenylamine sulfonate as indicator.
• Reagents (as specified):
  • Potassium dichromate standard solution (8.780 g/l)
  • Ammonium iron(II) sulfate solution (60 g/l in sulfuric acid, 1+7)
  • Phosphoric acid (specified concentration/density in the standard)
  • Sodium diphenylamine sulfonate indicator (0.8 g/l)
• Apparatus: Ordinary laboratory glassware plus a specified conical flask fitted with two outflow pipes (figure provided). A source of carbon dioxide and a hotplate are used during dissolution.
• Sampling and sample preparation: Test sample crushed to ≤100 µm and air-dried; recommended test portion 0.25 g. Sampling and preparation reference ISO 4296 parts 1 and 2.
• Procedure essentials:
  • Run three parallel determinations from the same sample; perform a blank test.
  • Pass CO2 through the closed flask while heating with excess Fe(II) reagent to dissolve the ore.
  • After cooling, add phosphoric acid and indicator, then titrate the excess Fe(II) with K2Cr2O7 until a persistent violet–blue end point.
  • Standardize the dichromate titre against a standard manganese ore sample; use the average of three results.
• Expression of results: Active oxygen reported as % MnO2 on a dry basis using the measured titres and a conversion factor; permissible tolerances for three parallel determinations are given by ranges of active oxygen content.

Applications and who uses it

• Quality control and chemical assay laboratories in mining and mineral processing.
• Producers and traders of manganese ores and concentrates for grading and specification compliance.
• Regulatory bodies and inspection laboratories requiring standardized determination of active oxygen (MnO2 equivalent).
• Research and development groups working on manganese ore beneficiation or metallurgical feedstock characterization.

Related standards

• ISO 4296-1 - Manganese ores - Sampling - Increment sampling
• ISO 4296-2 - Manganese ores - Sampling - Preparation of samples
• ISO 4297 - Manganese ores and concentrates - General methods of chemical analysis

Keywords: ISO 312:1986, manganese ores, active oxygen determination, manganese dioxide, titrimetric method, ammonium iron(II) sulfate, potassium dichromate, sodium diphenylamine sulfonate.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2001
0DQJDQRYHUXGH'RORþHYDQMHDNWLYQHJDNLVLNDL]UDåHQHJDNRWPDQJDQRYGLRNVLG
7LWULPHWULMVNDPHWRGD
Manganese ores -- Determination of active oxygen content, expressed as manganese
dioxide -- Titrimetric method
Minerais de manganèse -- Dosage de l'oxygène actif, exprimé en dioxyde de
manganèse -- Méthode titrimétrique
Ta slovenski standard je istoveten z: ISO 312:1986
ICS:
73.060.20 Manganove rude Manganese ores
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME>KJJYHAPOJJHAR OPrAHM3A~MR l-l0 CTAH~APTM3ALWl@ORGANlSATlON INTERNATIONALE DE NORMALISATION
Manganese ores - Determination of active oxygen
content, expressed as manganese dioxide - Titrimetric
method
Minerais de manganhe - Dosage de l’oxyghe actif, exprime en dioxyde de manganese - M&ode titrim&rique
Third edition - 1986-06-01
UDC 543.24: 669.74 : 543.844 Ref. No. IS0 3124986 (E)
: minerals and ores, manganese ores, chemical analysis, determination of content, oxygen, volumetric analysis.
Descriptors
Price based on 2 pages
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 312 was prepared by Technical Committee ISO/TC 65,
Manganese and chromium ores.
This third edition cancels and replaces the second edition (IS0 312-X380), of which it
constitutes a minor revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Qrganization for Standardization, 1986
Printed in Switzerland
IS0 312-1986 (E)
INTERNATIONAL STANDARD
Determination of active oxygen
Manganese ores -
content, expressed as manganese dioxide - Titrimetric
method
4.3.2 Standardization of the solution
1 Scope and field of application
This International Standard specifies a titrimetric method, by
Take three test portions from a standard sample of manganese
reduction with ammonium iron sulfate, for the determination
ore having a known manganese dioxide content approximately
of the active oxygen content (conventionally expressed as
the same as that of the sample to be analysed and pass them
manganese dioxide) of manganese ores.
through all stages of the analysis (7.4).
The titre of the potassium dichromate solution is given by the
2 References
formula
IS0 429611, Manganese ores - Sampling - Part 7 : lncremen t
BXUl
sampling.
T=
vx 100
IS0 429612, Manganese ores - Sampling - Part 2: Prepara-
tion of samples.
where
IS0 4297, Manganese ores and concentrates - Methods of
T is the titre of the potassium dichromate solution, ex-
General ins true tions. I
chemical analysis -
pressed as grams of manganese dioxide corresponding to
1 ml of the solution;
3 Principle
B is the manganese dioxide content, as a percentage by
mass, of the standard samp
...

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME>KJJYHAPOJJHAR OPrAHM3A~MR l-l0 CTAH~APTM3ALWl@ORGANlSATlON INTERNATIONALE DE NORMALISATION
Manganese ores - Determination of active oxygen
content, expressed as manganese dioxide - Titrimetric
method
Minerais de manganhe - Dosage de l’oxyghe actif, exprime en dioxyde de manganese - M&ode titrim&rique
Third edition - 1986-06-01
UDC 543.24: 669.74 : 543.844 Ref. No. IS0 3124986 (E)
: minerals and ores, manganese ores, chemical analysis, determination of content, oxygen, volumetric analysis.
Descriptors
Price based on 2 pages
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 312 was prepared by Technical Committee ISO/TC 65,
Manganese and chromium ores.
This third edition cancels and replaces the second edition (IS0 312-X380), of which it
constitutes a minor revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Qrganization for Standardization, 1986
Printed in Switzerland
IS0 312-1986 (E)
INTERNATIONAL STANDARD
Determination of active oxygen
Manganese ores -
content, expressed as manganese dioxide - Titrimetric
method
4.3.2 Standardization of the solution
1 Scope and field of application
This International Standard specifies a titrimetric method, by
Take three test portions from a standard sample of manganese
reduction with ammonium iron sulfate, for the determination
ore having a known manganese dioxide content approximately
of the active oxygen content (conventionally expressed as
the same as that of the sample to be analysed and pass them
manganese dioxide) of manganese ores.
through all stages of the analysis (7.4).
The titre of the potassium dichromate solution is given by the
2 References
formula
IS0 429611, Manganese ores - Sampling - Part 7 : lncremen t
BXUl
sampling.
T=
vx 100
IS0 429612, Manganese ores - Sampling - Part 2: Prepara-
tion of samples.
where
IS0 4297, Manganese ores and concentrates - Methods of
T is the titre of the potassium dichromate solution, ex-
General ins true tions. I
chemical analysis -
pressed as grams of manganese dioxide corresponding to
1 ml of the solution;
3 Principle
B is the manganese dioxide content, as a percentage by
mass, of the standard sample of manganese ore;
Dissolution of a test portion in an excess of a standard solution
m is the mass, in grams, of the test portion from the stan-
of ammonium iron(U) sulfate in sulfuric acid, to reduce the
dard sample;
manganese dioxide present in the test portion. Back-titration of
the excess of ammonium iron sulfate with standard
V is the volume, in millilitres, of potassium
...

Norme internatimale
INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONOME>~(~YHAPO~HAR OPTAHM3ALU’lR l-IO CTAH~APTM3AlJWl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
,Minerais de manganese - Dosage de I’oxygene actif,
exprime en dioxyde de manganese - M&hode
titrimetrique
Manganese ores - Determination of active oxygen content, expressed as manganese dioxide - Titrimetric method
TroisiGme Edition - 1986-06-01
R&f. no : IS0 312-1986 (F)
CDU 543.24: 669.74 : 543.844
: min&al, minerai de manganese, analyse chimique, dosage, oxygkte, methode volum6trique.
Descripteurs
Prix base sur 2 pages
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de I’ISO). L’elaboration
des Normes internationales est confide aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a le droit de faire partie du comite technique
tree a cet effet. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO participent egalement aux travaux.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO. Les Normes internationales sont approuvees confor-
mement aux procedures de I’ISO qui requierent I’approbation de 75 % au moins des
comites membres votants.
La Norme internationale IS0 312 a ete elaboree par le comite technique ISO/TC 65,
Minerals de mangankse et de chrome.
Cette troisieme edition annule et remplace la deuxieme edition (IS0 312-1980) dont elle
constitue une revision mineure.
L’attention des utilisateurs est attiree sur le fait que toutes les Normes internationales
sont de temps en temps soumises a revision et que toute reference faite a une autre
Norme internationale dans le present document implique qu’il s’agit, sauf indication
contraire, de la derniere edition.
Organisation internationale de normalisation, 1986
Imprim en Suisse
IS0 312-1986 (F)
NORME INTERNATIONALE
Minerais de manganese - Dosage de I’oxygGne actif,
exprim6 en dioxyde de manganese - M&hode
titrimetrique
4.3.2 Etalonnage de la solution
1 Objet et domaine d’application
La presente Norme internationale specific une methode titrimetri-
Prelever trois prises d’essai dans un echantillon type de minerai
que de dosage par reduction au sulfate double d’ammonium fer(ll)
de manganese dont la teneur donnee en dioxyde de manganese
hexahydrate, de I’oxygene actif (exprime conventionnellement en
est voisine de celle de I’echantillon a analyser et leur faire subir
dioxyde de manganese) dans les minerais de manganese.
toutes les etapes de I’analyse (7.4).
Le titre de la solution de dichromate de potassium est don&
2 Refhrences
par la formule
IS0 429611, Minerals de mangankse - &hantillonnage -
BXf7-l
Partie 7 : khan tillonnage par pr&vemen ts.
T= -
vx 100
IS0 429612, Minerais de mangankse - khantilfonnage -
Partie 2: Prhpara tion des khan tiflons.
0C.l
I SO 4297, Minerals et concentrks de mangarkse - Mthodes
T est le titre de la solution de dichromate de potassium,
Ins true tions g&&ales.
d’analyse chimique -
exprimee, en grammes, de dioxyde de manganese corres-
pondant a 1 ml de solution;
3 Principe
B est la teneur en dioxyde de manganese, en pourcentage
en masse, de I’echantillon type de minerai de manganese;
Mise en solution d’une prise d’essai par un exces de solution
etalon de sulfate double d’ammonium fer(ll) hexahydrate dans m est la masse, en grammes, de la prise d’essai de I’echan-
I’acide sulfurique, pour reduire le dioxyde de manganese con-
tillon type;
tenu dans la prise d’essai. Titrage en retour de I’exces de sulfate
V est le volume en millilitres, de la solution de dichromate
double d’ammonium fer(ll) hexahydrate par une solution tit&e
de potassium utilise.
de dichromate
...

Norme internatimale
INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONOME>~(~YHAPO~HAR OPTAHM3ALU’lR l-IO CTAH~APTM3AlJWl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
,Minerais de manganese - Dosage de I’oxygene actif,
exprime en dioxyde de manganese - M&hode
titrimetrique
Manganese ores - Determination of active oxygen content, expressed as manganese dioxide - Titrimetric method
TroisiGme Edition - 1986-06-01
R&f. no : IS0 312-1986 (F)
CDU 543.24: 669.74 : 543.844
: min&al, minerai de manganese, analyse chimique, dosage, oxygkte, methode volum6trique.
Descripteurs
Prix base sur 2 pages
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de I’ISO). L’elaboration
des Normes internationales est confide aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a le droit de faire partie du comite technique
tree a cet effet. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO participent egalement aux travaux.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO. Les Normes internationales sont approuvees confor-
mement aux procedures de I’ISO qui requierent I’approbation de 75 % au moins des
comites membres votants.
La Norme internationale IS0 312 a ete elaboree par le comite technique ISO/TC 65,
Minerals de mangankse et de chrome.
Cette troisieme edition annule et remplace la deuxieme edition (IS0 312-1980) dont elle
constitue une revision mineure.
L’attention des utilisateurs est attiree sur le fait que toutes les Normes internationales
sont de temps en temps soumises a revision et que toute reference faite a une autre
Norme internationale dans le present document implique qu’il s’agit, sauf indication
contraire, de la derniere edition.
Organisation internationale de normalisation, 1986
Imprim en Suisse
IS0 312-1986 (F)
NORME INTERNATIONALE
Minerais de manganese - Dosage de I’oxygGne actif,
exprim6 en dioxyde de manganese - M&hode
titrimetrique
4.3.2 Etalonnage de la solution
1 Objet et domaine d’application
La presente Norme internationale specific une methode titrimetri-
Prelever trois prises d’essai dans un echantillon type de minerai
que de dosage par reduction au sulfate double d’ammonium fer(ll)
de manganese dont la teneur donnee en dioxyde de manganese
hexahydrate, de I’oxygene actif (exprime conventionnellement en
est voisine de celle de I’echantillon a analyser et leur faire subir
dioxyde de manganese) dans les minerais de manganese.
toutes les etapes de I’analyse (7.4).
Le titre de la solution de dichromate de potassium est don&
2 Refhrences
par la formule
IS0 429611, Minerals de mangankse - &hantillonnage -
BXf7-l
Partie 7 : khan tillonnage par pr&vemen ts.
T= -
vx 100
IS0 429612, Minerais de mangankse - khantilfonnage -
Partie 2: Prhpara tion des khan tiflons.
0C.l
I SO 4297, Minerals et concentrks de mangarkse - Mthodes
T est le titre de la solution de dichromate de potassium,
Ins true tions g&&ales.
d’analyse chimique -
exprimee, en grammes, de dioxyde de manganese corres-
pondant a 1 ml de solution;
3 Principe
B est la teneur en dioxyde de manganese, en pourcentage
en masse, de I’echantillon type de minerai de manganese;
Mise en solution d’une prise d’essai par un exces de solution
etalon de sulfate double d’ammonium fer(ll) hexahydrate dans m est la masse, en grammes, de la prise d’essai de I’echan-
I’acide sulfurique, pour reduire le dioxyde de manganese con-
tillon type;
tenu dans la prise d’essai. Titrage en retour de I’exces de sulfate
V est le volume en millilitres, de la solution de dichromate
double d’ammonium fer(ll) hexahydrate par une solution tit&e
de potassium utilise.
de dichromate
...