DE746474C - Highly heat-resistant mortar for magnesite brick masonry - Google Patents

Description

(RGBI Π p. 150)

GERMAN REICH ISSUED ON
AUGUST 10, 1944

REICH PATENT OFFICE

PATENT LETTERING

VR 746 CLASS 80 b GROUP 8w

■ K158364 VJbßob

Dr. phil. Helmut support! in food

has been named as the inventor

Fried. Krupp AG. in food

Highly heat-resistant mortar for magnesite brick masonry

Patented in the German Reich on August 8, 1940 Patent issued December 30, 1943

It is known in the production of refractory products from magnesium orthosilicate to add finely divided metals of the iron group to the starting material, since their conversion into metal-oxygen compounds causes grease-proof cementation. Furthermore, it is no longer 'new' to use a refractory connection of magnesite brick masonry. 'Instead of using mortar made of magnesite and clay, intermediate layers made of sheet iron are used, since an intimate bond with the magnesite bricks is achieved through oxidation and reaction of these sheets Such sheets, however, swell strongly at high temperatures, so that, for example, the vaults of Martin ovens made with the help of such iron sheets rise too much, it has been proposed to use wire mesh instead of the sheets costly. _v

JNFäch another known process a paste made of iron powder is used to build up refractory magnesite brickwork, ■ For example, applied from finely ground iron sponge or the mortar Metals in crushed form as well as in the form of turnings, roller sintering, hammer blows mixed in. But also with this one Execution mode can make the increase in volume caused by oxidation uncomfortable noticeable by pushing the stones to be connected apart. Also is fine iron powder that gives better results than sponge iron or not enough finely divided iron, relatively expensive. /

According to the present invention, these. Disadvantages eliminated by the fact that for Masonry made of magnesite or magnesite bricks, highly heat-resistant mortar is used / which consists of iron oxides and which with water or a binding Liquid is turned on. In contrast to the known methods, therefore, according to the invention Highly heat-resistant mortar made from iron oxides, thereby the

Oxidation is anticipated and the reaction of iron oxide with the magnesium oxide of the stones with the formation of magnoferrite of the formula Mg Q · Fe ₂ O _{3 is} facilitated, since iron oxide is available for the reaction from the outset. The iron oxides are mainly cheap hammer blows or roller sintering in ground form or powdered waste ores of sufficient ■ purity,

ίο Pebble burns and similar cheap substances in Question.

The technical progress given by the invention consists first of all in that despite the use of cheap raw materials and with a simple way of working, a better and more durable masonry can be achieved than with the masonry according to the known Working method. It is also advantageous that the known method occurs and largely undesirable increase in volume of the masonry is avoided.

Claims (3)

Patent claims: i. Highly heat-resistant mortar for masonry made of magnesite or magnesite Stones, characterized in that it consists of iron oxides and with ' Water or a binding liquid. 2. Mortar according to claim i, characterized in that that as iron oxide powdered hammer blow or roller sintering is used. 3. Mortar according to claim 1, characterized in that that hydroxydic iron ore powder, sulfur gravel burns o, the like. Are used as iron oxide To differentiate the subject matter of the application from the state of the art are in the granting procedure the following publications have been considered: - German patent specification ..... No. 273 364; Austrian - - 106468; USA, - - -i 205 056; Dammer, Bruno and Tietze, Oskar, The Usable Minerals (1927), Stuttgart, Vol. I ■■ p. 367; Ztschrft. Das Betonwerk (1930), p. 536; Tonindustrie-Zeitung (1931), p. 96 r. Sp. Paragraph 4.