Development of basic heat-insulating bricks by burn-out process

MgO-heat insulating bricks were produced using high quality sinter- MgO, 25 % or 35 % combustible materials and 20 % spinel (M-Sp/I) or alumina (M-Sp/II) additives. For sufficient strength MgSO4 was added in amount of 7.5 %. Petroleum coke and saw dust mixture was used as combustible material. The optimal heating profile was determined with the help of thermo gravimetric analyses. Hematite fines were used as sintering aid. The formed samples were sintered at 1500 and 1600 degreesC. The thermal conductivity curves and micro-structure of the samples were similar to those of the reference sample

Investigations regarding the development of high alumina self-flowing bodies based on sintered bauxite and fused corundum grains

Unshaped refractory materials with self-flowing processing properties are of increasing interest for linings in high temperature plants. High alumina refractory products are suitable for different lining requirements. The development of a self-flowing body with a grain structure made of sintered dolomite or fused corundum will be described here

Investigations in the development of self-flowing basic castables

The general trend toward the use of self-flowing castables in high-temperature plant is based on the development and use of self-flowing basic bodies based on MgO or MgO spinels, respectively. A targeted use of dispersing agents can reduce the hydration tendency of MgO effectively. The use of sinter magnesia in the coarse grain range and fused magnesia in the ultra fine grain range results in an optimised solution for the lattice grain. For the binder matrix, the use of a reactive alumina mixture is well-suited, one with which the MgO almost completely reacts forming spinel. Observing the grain distribution of the ultrafine grain portion, self-flowing bodies can be achieved with an amount of slump equal to 100 %, having 8 % moisture content. These bodies containing 70 % MgO result in the highest level of microstructural formations and high temperature properties when dried and pre-fired at 850 degreesC and 1500 degreesC respectively. The bodies should be able to be used at temperatures significantly above 1500 degreesC

New microstructural aspects in the manufacture of high-alumina refractory materials

17.50; Translated from German (Keram. Z. 1987 v. 39(10) p. 695-697)SIGLEAvailable from British Library Document Supply Centre- DSC:9022.0601(BISI-EM-Trans--103)T / BLDSC - British Library Document Supply CentreGBUnited Kingdo