Fire-resistant gravity flow pouring material and method for making same

Abstract

The present invention relates to a preparation method for a fireproof self-flow pouring material. The technical scheme in the present invention is that: the fireproof self-flow pouring material is mixed and milled by the following components with the weight ratio that are: 35-55wt percent of bauxite grain, 5-20wt percent of bauxite powder, 5-25wt percent of corundum powder, 5-30wt percent of electrical-melting sand grain, 2-10wt percent of pure calcium aluminate cement, 2-6wt percent of silicon powder, 2-10wt percent of alpha -Al2O3 powder, 0.1-0.2wt percent of water reducer and so on. The fireproof and self-pouring material prepared by the present invention is characterized in non-segregation, good fluidity, easy to be constructed, higher density, better intension and much lower cost and so on. The present invention is widely adaptable to be used in the heat stove bushing including a heat stove bushing, steel enveloping persistent level and middle enveloping level and so on.

Description

1. Technical field [0001] The invention belongs to the technical field of refractory castables. In particular, it relates to a refractory self-flowing castable and a preparation method thereof. 2. Background technology [0002] Self-flow castable (Self-flow Castable) refers to low cement, ultra-low cement or cement-free refractory castables characterized by their fluidity after mixing, low cement or ultra-low cement refractory castables with this fluidity do not need It can flow and degas by applying external force without obvious segregation. Due to the good flow characteristics of self-flowing castables, it has attracted people's attention in recent years. It can be filled only by its own gravity without vibration, so it has more advantages than low-cement castables in many occasions. Self-flowing castables can be used in places where it is difficult to apply vibration or even if vibration is applied, it is difficult to make the vibrating castable flow and fill, such as ...

AI Technical Summary

Problems solved by technology

The adjustment of particle gradation has no novelty and cannot significantly change the performance of self-flowing castables, and the addition of ultra-fine powder and high-efficiency dispersants increases the cost of self-flowing castables; increasing the amount of water often leads to increased porosity of self-flowing castables 1. The product is easy to crack, low in strength and poor in wear resistance during baking. For example, "self-flowing castable refractory" (CN96116065.9) is composed of fused brown corundum coarse particles and fine powder, silicon carbide coarse particles, and synthetic magnesium aluminum spinel powder , superfine silica powder, and high alumina cement are blended into the main material in a certain proportion, and then mixed with an appropriate amount of additives, but the amount of water added is large

Adding water does not make the low-cement castable have suitable self-flowing performance, and adding more water will seriously damage the performance of the castable, such as reducing the density and strength, thereby reducing the structural strength, erosion resistance and wear resistance

[0004] In addition, the fused ceramsite sand widely used in the foundry industry is spherical particles formed by melting and blowing alumina, and the particle size is generally between 2 and 0.1mm. The foundry industry is widely used, but most of the fused ceramsite sand larger than 0.6mm is discarded, which not only wastes resources, but also pollutes the environment