Al2O3-SiO2 spherical lightweight refractory aggregate

Abstract

The invention discloses a preparation technology of a Al2O3-SiO2 spherical lightweight refractory aggregate. The preparation technology is simple, the prepared product has controllable, precise and controllable shape, particle size distribution, fine powder amount and phase composition, provides an accurate raw material for the particle ratio design of a refractory material, and reduces resource wastes. The Al2O3-SiO2 spherical refractory material aggregate is prepared from, by weight, 70-99 parts of bauxite raw ore powder, 0.5-20 parts of clay raw ore powder and 0.1-10 parts of alumina powder; and added ignition lost substances account for 25-45% of the total weight of the raw materials, and an additive added in the invention is 0.5-16% of the total weight of the raw materials. Castable produced by using the Al2O3-SiO2 spherical lightweight refractory aggregate has obviously better bulk density and obviously better strength than irregular materials.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an Al 2 o 3 -SiO 2 Spherical lightweight refractory aggregate and its preparation process. Background technique [0002] Refractory materials are divided into shaped products and unshaped products. Refractory bricks can be classified as shaped products, and castables, ramming materials, spray coatings, etc. can be classified as unshaped products. Whether it is shaped or not, granules and fine powders are required for production. The granules are called aggregates, and the fine powders become the matrix. Generally, aggregates above 0.1 mm are defined as aggregates. The traditional manufacturing method of aggregate is: first grind the mineral or synthetic raw materials, and then burn them in the rotary kiln, vertical kiln or tunnel kiln after compacting, and then the sintered bulk raw materials go through rough crushing, medium crushing and other processes before be...

AI Technical Summary

Problems solved by technology

Therefore, it is very difficult to control the microstructure of refractory materials.

[0004] On the other hand, because the clinker particle size required by the user is different, it will also cause waste of resources

For example, a user only needs 3-1mm particles, but 1-0mm particles will inevitably be produced during the crushing process. These particles need to be processed separately or sold at a low price, resulting in waste of resources

[0005] For traditional lightweight aggregates, the scraps from the processing of light products are often used for processing. However, light products mostly use spherical lost matter with larger particle sizes, and there are cavities of different sizes on the surface of aggregates. When using, add The fine powder will fill the cavity first, and then it will play the role of binding matrix, which will increase the content of fine powder in the proportion, thereby increasing the body density and reducing the heat insulation effect

[0006] For traditional light raw materials, the crushing method is often used to prepare different particle sizes, but due to the low strength of light raw materials, any crushing method will produce a large amount of fine powder, especially the 1-0mm particle size, which contains a large amount of fine powder, and The ratio is unstable, which seriously affects the accuracy of the ratio when used