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है”ह”ह

IS 10346 (2004): Flux grade dolomite for use in steelplants [MTD 13: Ores and Raw Materials]

IS 10346:2004

{

Indian Standard

DOLOMITE FOR METALLURGICAL ANDREFRACTORY USE — SPECIFICATION

(Second Revision)

ICS 73.080

0 BIS 2004

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

October 2004 Price Group 1

.,

Ores and Raw Materials Sectional Committee, MTD 13

FOREWORD

This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalizedby the Ores and Raw Materials Sectional Committee had been approved by the Metallurgical Engineering DivisionCouncil.

This standard was first published in 1982 and subsequently revised in 1991. In this revision the title has beenmodified to align with its scope, the requirement of degradation index, alkali content for all the three grades andCaO + MgO for Grade 2 and Grade 3 have been included. Limits of other constituents as well as size ranges havealso been modified.

DoIomite is used extensively in integrated steel plants as flux, for the production of iron in blast fhmace andfetling material in open hearth and other furnaces for the production of steel and also by the refractorymanufacturers. This standard would be helpful in procuring standard dolomite for metallurgical and refractoryuse.

For the purpose of deciding whether particular requirement of this standard is complied with the finalvalue, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordancewith IS 2: 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retainedin the rounded off value should be the same as that of the specified value in this standard.

IS 10346:2004

Indian Standard

DOLOMITE FOR METALLURGICAL ANDREFRACTORY USE — SPECIFICATION

(Second Revision)

1 SCOPE

This standard covers the requirements of dolomite formetallurgical and refractory use.

2 REFERENCES

The following standards contain provisions whichthrough reference in this text, constitute provisions ofthis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:

IS No.

460(Part 1): 1985

1387:1993

1760

(Part 1): 1991

(Part 2): 1991

(Part 4): 1991

(Part 5): 1991

2109:1982

Title

Specification for test sieves: Part 1Wire cloth test sieves (thirdrevision)General requirements for the supplyof metallurgical materials (secondrevision)Methods of chemical analysis oflimestone, dolomite and alliedmaterials:Determination of loss on ignition(jhst revision)Determination of silica ~irstrevision)Determination of carbon dioxide

(first revision)Determination of chlorides @strevision)Methods of sampling dolomite,limestone and other allied materials(jirst revision)

3 TERMINOLOGY

For the putpose of this standard, the definition as givenin IS 2109 shall apply.

4 SUPPLY OF MATERIAL

General requirements relating to the supply of differentgrades of limestone for use in steel plants shall be aslaid down in IS 1387.

5 GRADE DESIGNATION

Dolomite for metallurgical and refractory use shall beof the following three grades as given in Table 1:

a) For refracto~ use — Grade 1,

b) For steel making — Grade 2, and

c) For iron making — Grade 3.

6 CHEMICAL COMPOSITION

6.1 The material shall comply with the chemicalrequirements as given in Table 1.

Table 1 Chemical and Size Requirements(Clauses 5,6.1 and 7)

SI Constituents Grade1 Grade2 Grade3No.

(1) (2) (3) (4) (5)

i) (CaO + MgO)content percentbymass,Min

ii) CaO C4srrtentpercentby mass,Min

iii) MgO content,percentby mass,Min

iv) SiOl conters~percentby mass,Mux

v) Total acid insoluble,percentby mass,Max

vi) Alkali percentbymass,Max

vii) Size rangeUndersize

Oversize

52

—

20

1

2

0.2

8t020mmNot morethan 5%Not morethan 5%

50 46

30 –

20 19

2.0 -

3.0 8

0.2 0.2

8t020mm 6t060mmNot more Not morethan 5% thll 5%’.

Not more Not morethSOs~o than 5%

NOTES

1 The size rangesother than specified above shall be subjectto agreement between the supplier and the purchaser.

2 In caseof use as a fetling material:

a) Size range may be up to 5-20 mm.

b) CaO+MgO can be brought down to +)y. Min, MgO19 percent Min, Si02 4 percent Max and total acid;insoluble 5 percent Max.

6.1.1 The chemical composition, when analyzed bythe method specified in relevant parts of IS 1760 orany other established instrumental/chemical method

IS 10346:2004

shall conform to the requirements as given in Table 1.In case of dispute, the procedure given in relevant partsof IS 1760 shall be the referee method. However, whenthe method is not given in relevant parts of IS 1760,the referee method shall be as agreed to between thepurchaser and the supplier.

7 PARTICLE SIZE

The particle size of the material, when determined inaccordance with IS 460 (Part 1) shall comply with thesize requirements given in Table 1.

8 DECREPITATION/DEGRADATION INDEX

Decrepitation and degradation Index of dolomiteshall be 10 percent maximum, each. The method fordetermination of decrepitation and degradation indexis given in Annex A, for guidance.

9 SAMPLING

Representative samples for testing shall be drawnaccording to the method of sampling giveninIS2109.

10 NUMBER OF TESTS

10.1 The testing for determination of calcium oxide,magnesium oxide and total insoluble including silicashall be carried out on each of the samples.

10.2 Tests for size determination shall be performedon the composite samples.

11 CRITERIA FOR CONFORMITY

11.1 For Individual Samples

The mean and the range of test results shall becomputed as follows:

Mean (g) =Sum of individual test results

Number of test results

Range (R) = Difference between the maximumand minimum values of test results

For declaring conformity of the lot:

a) ~ + 0.6 R, shall be less than or equal to themaximum specified requirements, and

b) ~ – 0,6 R, shall be greater than or equal tothe minimum specified requirements.

11.2 For Composite Samples

For declaring the conformity of the lot of therequirements of characteristics tests on the compositesample, the test results shall satis~ the correspondingspecified requirements.

ANNEX A

(Clause 8)

GUIDELINES FOR DETERMINATION OF DECREPITATION/DEGRADATION INDEX

A-1 Dolomite is crushed to 25-30 mm size.

A-2 About 3 kg. Sample is calcined in a furnace whichhas already attained a temperature of 1 000”C. Thesample is kept in the furnace for two and half hours.The calcined dolomite thus obtained is cooled, weighedand then screened on a laboratory vibrating screen.The –1 O mm fraction obtained is weighed. Thepercentage of –1Omm fraction with respect to the totalmass of the calcined dolomite screened shall be thedecrepitation index.

A-3 Take 2 kg of +1O mm calcined dolomite afterscreening. Drop twice from a height of 2 m on a steelplate. Subject this material for screening at 10 mm.The proportion of –1 O mm fraction expressed aspercentage with respect to the material taken for thetest shall be the degradation index.

A-4 The desirable limits for decrepitation anddegradation indices as determined above shall be10 percent maximum, each.

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This Indian Standard has been developed from Dot: No. MTD 13 (4336).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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