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IS 13054 (1991): Quartzite/quartz for the production Quartzite is a major raw material in the smelting of ferrosilicon, silicon metal and silicomanganese. A need was, therefore felt

Jun 30, 2020

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    IS 13054 (1991): Quartzite/quartz for the production of ferroalloys [MTD 13: Ores and Raw Materials]

  • Indian Standard QIJARTZITE/QUARTZ FOR THE PRODUCTION

    OF FERROALLOYS — SPECIFICATION

    UDC 553’546:669’168

    @ MS 1991

    BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADtJR SHAH ZAFAR MARG

    NEW DELHI 110002 ‘way 1991 Price Group 1

  • Ores and Raw Material Sectional Committee, MTD 13

    FOREWORD

    This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Ores and Raw Materials Sectional Committee had been approved by the Metallurgical Engineering Division Council.

    Quartzite is a major raw material in the smelting of ferrosilicon, silicon metal and silicomanganese. A need was, therefore felt to prepare an Indian Standard for quartzite for use in submerged are furnace.

    Impurities such as alumina has been restricted to allow for contribution from the reductants. Thermal stability and mechanical strength have been considered important physical properties to ensure good permeability of the charge column inside the submerged arc furnace for greater safety and smelting efficiency.

    No marking clause has been included in this standard since quartzite is supplied loose.

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

  • IS 13054 : 1991

    Indian Standard QUARTZITE/QUARTZ FOR THEPRODUCTION

    OF FERROALLOYS-SPECIFICATION .

    1 SCOPE non-friable material with size range as follows:

    This standard covers the requirement of quartzite suitable for the production of ferrosilicon.

    10 to 150 mm 3 150 -10 mm,m

    10 percent, Max 5 percent, Max

    2 REFERENCE

    The following Indian Standards are necessary adjuncts to this standard:

    IS No.

    1387 : 1967

    1917 : 1962

    2245 : 1962

    6495 : I 984

    Tide

    General requirements for the supply of metallurgical materials

    Methods of chemical analysis of quartzite and high silica sand

    Methods of sampling quartzite

    Method of tumbler test for iron oxides : lump ores, sinter and pellets (first revision )

    4.2.2 Thermal stability is characterised by the proportion of + 19 mm in a 200 g sample of - 25 + 19 mm size fraction which has been subjected to heating at I 300°C for one hour and cooling to room temperature. Description should not generate excessive fines. Accordingly, the quartzite shall satisfy the following:

    + 19 mm above 55 percent - 5 mm below 5 percent

    4.2.3 Mechanical strength after heating and cooling, as in 4.2.2, is characterised by the pro- portion of + 5 mm after tumbling ( 100 revolu- tions in 2’5 minutes ). The tumbling test may be done in accordance with IS 6495 : 1984. Accor- dingly, quartzite shall satisfy the following.

    3 SUPPLY OF RAW MATERIALS

    General requirement relating to the supply of different grades of quartzite for ferrosilicon smelting shall be as laid down in IS 1387 : 1967.

    4 CHEMICAL AND PHYSICAL REQUIREMENT

    + 5 mm above 90 percent.

    4.3 Any deviation from the norms in 4.1 and 4.2 may be mutually agreed between the purchaser and the supplier.

    5 SAMPLING

    4.1 Chemical Requirement

    The representative samples of quartzite shall be drawn according to scheme of sampling given in IS 2245 : 1962.

    The material when tested either in accordance with IS 1917 : 1962 or any other established instrumental/chemical method shall comply with the requirements given in Table 1. In case of dis- pute the procedure given in the latest version of IS 19 17 : 1962 for chemical analysis shall be the ‘Referee Method’.

    6 CRITERIA FOR CONFORMITY

    6.1 For Individual Samples/Laboratory Samples

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

    Mean ( p ) = Sum of individual test results Number of test results

    Table 1 Chemical Composiiioo for Quart&e/Quartz

    Grade Constituent, Percent r------ A_-_-___

    SiO2 A1203 Other Oxid

    Min Max Max

    : E’ 0’1 0’25 8%

    3 98 0’60 1’4

    NOTE - Upper limit of Si02 and other constituents may be mutually agreed by the supplier and the purchaser.

    Range ( k ) = Difference between the maxi- mum and minimum values of test results.

    4.2 Physical Requirement

    4.2.1 Quartzite shall be lumpy, free from dirt and other foreign matter and shall be hard, dense and

    For declaring conformity of the lot:

    ? + 0’6 R’shall be less than or equal to the maximum specified requirements

    or

    P - 0’6 R’ shall be greater than or equal to the minimum specified requirements.

    6.2 For Composite Samples

    For declaring the conformity of the lot to the requirements of characteristics tested on the composite sam..Le, the test cesul..~ s?&.~~sakX~ the corresponding specified requirements.

    1

  • -.-_.’

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    Dot : No. MTD 13 ( 3664 1

    Ameodments Issued Since Publication

    Amend No. Date of Issue Text Affected

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