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Magnesium iron (aluminum) spinel brick (periclase composite spinel brick)

It has good performance of sticking kiln skin. In the process of use, Fe2O3 and AL2O3 in the products are easy to react with CaO in cement clinker to generate C2F, C4AF and other low melting point minerals. The mineral has a certain viscosity and can firmly adhere to the hot surface of magnesium iron (aluminum) spinel brick to form a stable kiln skin.

Key words:

Magnesium iron (aluminum) spinel brick (periclase composite spine

Classification:

Refractory materials for cement industry

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Product Introduction

Magnesium-iron-aluminum spinel brick (patent number: ZL 2011 1 0452288.2) is a combination of our company's more than 40 years of professional cement kiln production and service experience. The product has the characteristics of compact structure, high strength, wear resistance, high load softening temperature, erosion resistance, strong kiln skin adhesion ability, excellent thermal shock stability, etc., is a large-scale cement rotary kiln firing belt to replace the import of the ideal longevity products.

1. Performance characteristics:

1) Good structural toughness and excellent thermal shock stability. During the firing and use of magnesia-iron spinel bricks, Fe2 ions diffuse into the surrounding magnesia matrix, while some Mg2 ions diffuse into the ferroaluminate spinel particles and react with the residual alumina decomposed by the ferroaluminate spinel to generate magnesia-aluminum spinel. This active effect causes a large number of microcracks to form inside the products during the firing and use of the products. The existence of these cracks is beneficial to buffer the thermal stress and improve the thermal shock stability of the products, it is important that the decomposition process of the iron aluminum spinel and the interdiffusion of Fe2 ions and Mg2 ions continue at high temperatures, so that the MgO-FeAl2O4 refractory material has good structural toughness during the overall high temperature use.

2) high strength, strong resistance to erosion. The internal iron aluminum spinel and high purity magnesia are mutually soluble, the structure is uniform and dense, the grain is well developed, the particles and the matrix are connected through the intergranular spinel, the combination is good, and the high temperature strength of the product and the erosion resistance of the clinker liquid phase are significantly improved.

3) has a good adhesive hanging kiln skin performance. In the process of use, Fe2O3 and AL2O3 in the products are easy to react with CaO in cement clinker to generate C2F, C4AF and other low melting point minerals. The mineral has a certain viscosity and can firmly adhere to the hot surface of magnesium iron (aluminum) spinel brick to form a stable kiln skin.

2. Physical and chemical indexes:

Project	HWMF-A	HWMF-B
Project	Standard value	Standard value
MgO(%)≥	87	85
Al₂O₃ (%)	3-5	5-7
Fe₂O₃(%)	4-6	3-5
SiO₂(%)≤	1.0	1.2
Percent porosity (%)≤	16	18
Bulk density g/cm³≥	2.97	2.95
Normal temperature compressive strength (MPa)≥	80	70
0.2 MPa load softening temperature (T0.6 ℃)>	1700	1700
Thermal shock stability (1100 ℃ water cooling) times ≥	8	6