High-strength nano castable for iron-making slag-disintegrating pit

Abstract

The invention discloses a high-strength nano castable for an iron-making slag disintegrating pit. The high-strength nano castable is prepared from the following raw materials in parts by weight: 20-30 parts of a homogenized material with the particle size of 8-15mm; 12-18 parts of a homogenized material with a particle size of 5-8 mm; 12-18 parts of brown aluminum oxide with the particle size of 3-5 mm; 12-18 parts of brown aluminum oxide with the particle size of 0-3 mm; 5-7 parts of silica fume with the mesh number of not less than 200 meshes; 6-8 parts of activated aluminum oxide powder with the mesh number not smaller than 325 meshes is sieved; the concrete is prepared from the following components in parts by weight: 12 to 18 parts of pure calcium aluminate cement, 1.4 to 2.0 parts of heat-resistant steel fiber, 0.4 to 0.6 part of chromium oxide green, 0.08 to 0.12 part of sodium hexametaphosphate, 0.04 to 0.06 part of high-efficiency water reducing agent and 0.08 to 0.12 part of explosion-proof fiber. According to the invention, the particle size distribution of the raw materials is optimized, the high-efficiency water reducing agent and the sodium hexametaphosphate are used together, and a certain amount of chromium oxide green is adopted, so that the high-temperature strength performance and the slag corrosion resistance can be obviously improved, and in combination with the effects of other raw materials, the obtained castable is high in strength and excellent in slag corrosion resistance, and can well meet the use of an iron-making slag-disintegrating pit.

Description

technical field [0001] The invention belongs to the technical field of refractory material preparation, and in particular relates to a high-strength nano castable for ironmaking slag pits and a preparation method. Background technique [0002] Refractory castable is a kind of granular and powdery material made of refractory material with a certain amount of binder. It has high fluidity and is an amorphous refractory material formed by casting. The iron-making slag pit is a device commonly used for steel slag treatment. During the slag process, it is in a high-temperature, high-pressure and high-humidity environment for a long time. Castables require higher strength, slag erosion resistance and stability. [0003] Existing refractory castables generally add phosphates such as sodium hexametaphosphate and sodium tripolyphosphate as admixtures to promote hardening and increase the strength of castables. However, it has been found through research that phosphates tend to soften...

AI Technical Summary

Problems solved by technology

[0003] Existing refractory castables generally add sodium hexametaphosphate, sodium tripolyphosphate and other phosphates as admixtures to promote hardening and increase the strength of castables. However, it has been found through research that phosphates tend to soften at high temperatures and cannot meet the requirements Amount requirements for refractory castables for ironmaking slag pits