The magnesia-ferrous composite spinel brick is a new product for cement kilns. It uses composite spinel bricks and high-purity magnesia as the main raw materials, adds specific mineralizers, and is formed by high-pressure molding and high-temperature sintering. It is a new generation of basic refractories with better technical content at present. This product is mainly used in the firing zone of large new dry-process cement kilns: basically, MgO-Fe2O3-Al2O3 spinel and periclase are the main crystal phases.
 

Features of magnesia ferrousspinel bricks

(1) During the use process, the hot surface of the brick forms a layer of calcium ferrous or calcium-aluminum-ferrous-oxide with high viscosity, which improves the performance of the hanging kiln skin and the firmness of the kiln skin, and is suitable for protecting the lining brick. Period extension.

(2) The spinel content is high, which not only has high strength but also has excellent thermal shock resistance, and can effectively resist the chemical erosion of cement clinker liquid phase and alkali, sulfur, and other gases.

(3) Spinel and periclase have inconsistent thermal expansion during firing and cooling. Generally speaking, the micro-cracks formed between them can buffer the stress impact caused by temperature changes and avoid the brittle bursting of lining bricks.

(4) Chromium-free and envferrousmentally friendly.

Product model: B620/B320, B622/B322
 

Product performance of magnesia ferrousspinel bricks

1. Excellent hanging kiln skin performance;

2. Low thermal conductivity (1000℃, 2.27w/m•k), small thermal expansion coefficient (1000℃, 1..217%);

3. The structure of magnesia ferrousspinel bricks is very flexible. It can resist erosion and penetration of alkali metal salts such as K2SO4, Na2SO4, NaCl, KCl, etc., which are decomposed by cement materials and have strong erosion resistance and penetration resistance.

4. High softening temperature under load, excellent thermal shock resistance, suitable for key parts of SP and NSP kilns with high kiln temperature, fast rotation speed, strong alkali erosion ability, and heavy mechanical load, which can effectively prolong the life of the furnace lining and maintain a low Kiln barrel temperature.