1、BRITISH STANDARD BSEN 993-16:1995 Dense shaped refractory products Methods of test Part16: Determination of resistance to sulfuric acid The European Standard EN993-16:1995 has the status of a British Standard ICS81.080BSEN993-16:1995 This British Standard, having been prepared under the directionof
2、the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 December1995 BSI08-1999 The following BSI references relate to the work on this standard: Committee reference RPI/1 Draft for comment93/305972DC ISBN 0 580 24791 0 Committee
3、s responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee RPI/1, Sampling and physical testing of refractory materials, upon which the following bodies were represented: British Ceramic Research Ltd. British Industrial Ceramic Manufacturers
4、 Association British Metallurgical Plant Constructors Association British Steel Industry British Vermiculite Association Refractories Association of Great Britain Refractories Contractors Association Society of Glass Technology Amendments issued since publication Amd. No. Date CommentsBSEN993-16:199
5、5 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN993-16 3 List of references Inside back coverBSEN993-16:1995 ii BSI 08-1999 National foreword This Part of BSEN933 has been prepared by Technical Committee RPI/1 and is the English langu
6、age version of EN993-16:1995 Dense shaped refractory products Methods of test Part16: Determination of resistance to sulfuric acid published by the European Committee for Standardization (CEN). BSEN993-16 supersedes BS1902-3.12:1989 which is withdrawn. The Technical Committee has reviewed the provis
7、ions of ISO565:1990 to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO565:1990 is BS410:1986. A British Standard does not purport to include all the necessary provisions of a contract. Users of
8、 British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard ISO383:1976 BS572:1985 Specification for interchangeable conical gro
9、und glass joints ISO1770:1981 BS1704:1985 Specification for solid-stem general purpose thermometers ISO1773:1976 BS2734:1984 Specification for boiling flasks (narrow-necked), conical, flat bottom and round bottom ISO4799:1978 BS5922:1980 Specification for glass condensers for laboratory use Summary
10、of pages This document comprises a front cover, an inside front cover, pagesi andii, the EN title page, pages2 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on th
11、e inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN993-16 August1995 ICS81.080 Descriptors: Refractory materials, shaped refractories, dense shaped refractory, chemical tests, chemical attack, chemical resistance, sulfonic acids English version Dense shaped refractory products
12、Methods of test Part16: Determination of resistance to sulfuric acid Produits rfractaires faonns denses Mthode dessai Partie16: Dtermination de la rsistance lacide sulfurique Prfverfahren fr dichte geformte feuerfeste Erzeugnisse Teil16: Bestimmung der Bestndigkeit gegen Schwefelsure This European S
13、tandard was approved by CEN on1995-07-10. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning su
14、ch national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language
15、 and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Unit
16、ed Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its member
17、s Ref.No.EN993-16:1995EEN993-16:1995 BSI 08-1999 2 Foreword This European Standard was prepared by Technical Committee CEN/TC187, Refractory products and materials, of which the secretariat is held by BSI. This European Standard shall be given the status of a national standard, either by publication
18、 of an identical text or by endorsement, at the latest by February1996, and conflicting national standards shall be withdrawn at the latest by February1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Den
19、mark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Reproducibility and repeatability data are not available, but may be given in a subsequent edition. EN993, Dense shaped refractory products Metho
20、ds of test consists of18 Parts Part1: Determination of bulk density and porosity; Part2: Determination of true density; Part3: Test methods for carbon-containing refractories; Part4: Determination of permeability to gases; Part5: Determination of cold crushing strength; Part6: Determination of modul
21、us of rupture, ambient temperatures; Part7: Determination of modulus of rupture, elevated temperatures; Part8: Determination of refractoriness-under-load; Part9: Determination of creep in compression; Part10: Determination of permanent change in dimensions on heating; Part11: Determination of resist
22、ance to thermal shock (ENV); Part12: Determination of pyrometric cone equivalent; Part13: Specification of pyrometric cones; Part14: Determination of thermal conductivity (hot wire, cross-array); Part15: Determination of thermal conductivity (hot wire, parallel); Part16: Determination of resistance
23、to acids; Part17: Determination of bulk density of granular material (mercury method); Part18: Determination of bulk density of granular material (water method). Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Reagents 3 6 Test samples 3 7 Procedure 3 8 Expr
24、ession of results 4 9 Test report 4EN993-16:1995 BSI 08-1999 3 1 Scope This Part of EN993 specifies a method for determining the resistance of dense shaped refractory products to attack by sulfuric acid. NOTESulfuric acid is used since it gives results which are typical of the results of exposing re
25、fractory materials to many acids (other than hydrofluoric acid). 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed he
26、reafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO383:1976, Laboratory glassware
27、 Interchangeable conical ground joints. ISO565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO1770:1981, Solid-stem general purpose thermometers. ISO1773:1976, Laboratory glassware Boiling flasks (narrow-necked). ISO4799:1978, Laborat
28、ory glassware Condensers. 3 Principle The test sample, crushed in a specified manner, is subjected for6h to attack by70%(m/m) boiling sulfuric acid, and the resultant mass loss is determined and expressed as a percentage of the initial mass of the dry material. 4 Apparatus Ordinary laboratory appara
29、tus and 4.1 Suitable mechanical crushing device, preferably not steel. 4.2 Woven metal wire cloth sieve,0,80mm aperture, conforming to the requirements of ISO565:1990. 4.3 Woven metal wire cloth sieve,0,63mm aperture, conforming to the requirements of ISO565:1990. 4.4 Balance, capable of weighing25g
30、 to the nearest0,001g. 4.5 Round-bottomed flasks, of capacity500ml (seeISO1773:1976), each with a short, narrow neck, equipped with a ground glass stopper (seeISO383:1976) for the insertion of a thermometer. 4.6 Coil condensers, of length250mm, having at least16turns in the coil (seeISO4799:1978). 4
31、.7 Immersion thermometers (length approximately110mm) (seeISO1770:1981). 4.8 Sand bath, oil bath, or heating mantle. 4.9 Porcelain filter crucible, with a maximum pore size of7m. 4.10 Thermostatically controlled drying oven, capable of maintaining a temperature of(110 5) C. 4.11 Desiccator 5 Reagent
32、s Use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 5.1 Sulfuric acid,70%(m/m), 15=1,615g/cm 3 . 5.2 Barium chloride,50g/l solution. 6 Test samples 6.1 From each sample, take two pieces of a total mass of approximately250g, one from the centre a
33、nd one from an edge. 6.2 Grind the two pieces together using the crushing device(4.1), sieving the material several times and re-grinding the residues until all the test material has passed through the0,80mm aperture sieve(4.2). If a steel mortar has been used, pass a magnet over the ground sample t
34、o remove any metallic contamination. NOTEThe material of the mortar should be harder than the test material. 6.3 Sieve the material through the0,63mm aperture sieve(4.3). Clear the residue on the sieve of all the dust particles by washing with distilled water. This residue forms the test material. N
35、OTEA systematic error will be introduced if grain sizes are used other than between the limits set in6.2 and6.3. 6.4 Dry the residue on the0,63mm aperture sieve in the drying oven(4.10), controlled at(110 5) C, until constant mass is reached. Before each weighing, allow the sieve with contents to co
36、ol to ambient temperature in the desiccator. Weigh to the nearest 0,001g. 7 Procedure 7.1 Carry out at least two tests in parallel. 7.2 For each test, weigh, to the nearest0,001g, about20g of the dried material (mass m 1 ).EN993-16:1995 4 BSI 08-1999 7.3 Place the weighed test material in a round-bo
37、ttomed flask(4.5) and cover it with200ml of the sulfuric acid(5.1). Attach a coil condenser(4.6) and insert a thermometer(4.7) so that it is immersed at least15mm in the liquid. 7.4 Over a period of about30min, bring the contents of the flask to boiling point in the sand or oil bath or heating mantl
38、e(4.8). NOTEThe boiling point of70%(m/m) sulfuric acid is approximately170 C. Record the temperature of the liquid after boiling has begun. 7.5 Keep the liquid boiling lightly for a period of6h. Note the temperature of the liquid at the end of this time. 7.6 After the liquid has boiled for6h, take t
39、he flask out of the bath or heating mantle and allow it to cool for1h. Decant the clear acid floating on top of the sample. Cautiously pour in approximately500ml of distilled water, and wash the whole contents of the flask into the porcelain filter crucible(4.9), previously dried and weighed to the
40、nearest0,001g, using an aspirator to aid filtering. Wash the residue in the filter crucible with distilled water until the filtrate remains unclouded when a few drops of the barium chloride solution(5.2) are added. 7.7 Dry the crucible containing the residue in the oven, controlled at(110 5) C, unti
41、l constant mass is reached. Before each weighing, allow the crucible and its contents to cool to ambient temperature in the desiccator. Weigh the crucible and its contents to the nearest0,001g. Subtract the mass of the crucible to obtain the mass of the residue, m 2 . 8 Expression of results Calcula
42、te the loss of mass of the test material, L %, as a percentage of its initial mass, using the formula: 9 Test report The test report shall include the following information: a) the name of the testing establishment; b) the date of the test; c) a reference to this European Standard, i.e.“Determinatio
43、n of resistance to sulfuric acid in accordance with EN993-16”; d) the material tested (manufacturer, type, batch number); e) the temperature of the acid shortly after boiling began and shortly before the end of the test; f) the individual values of the percentage loss of mass for each sample tested,
44、 and the calculated mean value. where m 1 is the initial mass, in grams, of the test material; m 2 is the mass, in grams, of the residue.BSEN993-16:1995 BSI 08-1999 List of references See national foreword.BSEN 993-16:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI i
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