Refractories and furnaces; properties, preparation, and application of materials used in the construction and operation of furnaces

Havard, Francis Thompson

$9781231104811: Refractories and furnaces; properties, preparation, and application of materials used in the construction and operation of furnaces$

ISBN 10: 1231104813 ISBN 13: 9781231104811

Verlag: RareBooksClub.com, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...or softening; the contraction in drying and burning should be small and the clay or material used should be sufficiently plastic. It is almost invariably necessary to use some ground bats or broken vessels as grog with the fresh clay to decrease the shrinkage. In the preparation of ordinary acidproof earthenware it is often advisable to add some mineral or salt to the clay to reduce its temperature of sintering or vitrification. Feldspar is generally added, but in most cases it is not necessary or even advisable to maintain a white body so that some mineral containing considerable feldspar may be used, such as phonolite or porphyry. The quantity and character of the added salts vary. In the case of large vessels we aim to obtain a mass with a low coefficient of contraction; in the preparation of small vessels the material must be fairly plastic and the mixture made to obtain such a result. The composition of the glazes varies greatly. Sometimes the feldspar is absolutely replaced by lime, when we obtain a clear glaze; when the lime is replaced by feldspar the glaze may be milky. The latest products of the chemical-supply manufacturers include the acidproof corundum articles made from ground and cleaned corundum and clay. One recipe calls for 84 parts ground corundum, 37 parts of clay and 9 parts of corundum dust. The resulting product shows almost no shrinkage on burning and is most refractory to change of temperature and the tax of acid. Acidproof Brick.--By acidproof or acid-resisting bricks we mean those which are used in the chemical industry under such conditions that they must resist attacks of acids, such as hot sulphuric acid in Glover and Gay-Lussac towers. The selection of the material for such bricks and tile is limited. It must burn dense and co...

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