High alumina brick and low creep high alumina brick What is the difference

Posted by adela li on January 4th, 2017

1 Introduction Edit

Aluminum oxide (Al2O3) content of more than 48% of the aluminum silicate refractory products.
Alumina content of 48% or more of a neutral refractory material. From bauxite or other alumina content of the higher raw materials formed and calcined. High thermal stability, refractoriness above 1770 ℃. Slag resistance is good for Refractory company masonry electric furnace, glass melting furnace, cement rotary furnace lining.
High alumina brick
High load and soft creep high alumina brick is a high grade refractory made of superfine bauxite, fused corundum and fused mullite as the main raw material. The product has high-temperature creep, corrosion resistance, thermal shock stability, etc., suitable for large and medium-sized hot stove, which is China's new hot stove required for high-quality, high-grade imported refractory materials to open up the next one The road to success, has been included in the national "Spark Program" project.

2 production process editing
High alumina brick and multi clinker fireclay refractories production process similar to the difference is that the proportion of ingredients in the clinker is high, up to 90 ~ 95%, clinker in the crushing before the need to sort and screening in addition to iron separation, firing temperature Higher, such as Ⅰ, Ⅱ and other high alumina bricks tunnel kiln firing is generally 1500 ~ 1600 ℃.
China's production practice has proved that high-alumina clinker in the crushing before the strict selection of grading and grading storage, the use of bauxite clinker combined with the fine grinding method, can improve product quality.

3 Raw material editing
According to resource conditions and product requirements are different, the following types of raw materials can be used: to water-aluminum mineral (gibbsite, gibbsite, etc.)
High alumina refractory brick 
(Including kyanite, andalusite, sillimanite, etc.); synthetic raw materials, such as industrial alumina, synthetic mullite, fused corundum, and so on. The main products are high-alumina bauxite; China's high-alumina-rich earth resources, fine texture. The production of high alumina bauxite, mainly biboleite (α-Al2O3 · H2O) and kaolinite mixture of two minerals.

4 Feature Editing

A, refractoriness
High alumina brick refractory than clay brick and semi-silica brick refractoriness should be high, up to 1750 ~ 1790 ℃, is a senior refractory material.
B, load softening temperature
Because the high aluminum products in the Al2O3 high, less impurities, the formation of fusible glass less, so the load softening temperature higher than the clay brick
High alumina brick
, But the mullite crystals did not form a network organization, so the load is still not softening temperature silica brick high.
C, slag resistance
Al2O3 in high alumina brick is close to neutral refractory and can resist the erosion of acid slag and alkaline slag. Because of containing SiO2, the ability of resisting alkali slag is weaker than that of acid resistant slag.