Low-contaminant andalusite series products for hot blast furnaces

This product is a high and new technology product developed by our company in 1987 with prominent features of small creep rate, high softening point of load, excellent high-temperature strength, etc. It passed the technical authentication of the Ministry of Metallurgy in 1989, filling the gap of the domestic market and replacing the imported products of the same type. During the same year, we supplied over 4,000 tons of products for 5# Blast Furnace and Hot Blast Furnace at WISCO, which were mainly used in the accumulator room, combustion room and fire well wall of the Hot Blast Furnace.

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Series for Hot Blast Furnaces

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Detail

Item	WHB	WHL	WHS	WHD
Al2O3 %	≥65	≥60	≥57	≥53
Fe2O3 %	≤1.0	≤1.2	≤1.5	≤1.7
Ti O2。% ，	≤0.5	≤0.5	≤0.6	≤0.6
K2O+Na2O，% ，	≤0.6	≤0.6	≤0.6	≤0.6
Apparent porosity,%	≤20/22	≤20/22	≤20/22	≤20/22
Bulk densityBD ,g/cm3	≥2.50	≥2.45	≥2.40	≥2.35
Normal temperature compressive strength CCS，MPa	≥60/55	≥50/50	≥50/45	≥50/45
Softening onset temperature at 0.2 MPa load RUL，℃	≥1680	≥1650	≥1600	≥1550
Reburning line change rate PLC（%）	1500℃×4h ± 0.2	1500℃×4h ± 0.2	1400℃×4h ± 0.2	1400℃×4h ± 0.2
Creep rate(0.2MPa),%	1500℃×20-50h≤0.2	1450℃×20-50h≤0.2	1400℃×20-50h≤0.2	1350℃×20-50h≤0.2
TSR ，（1100℃water cooling）next Cycle	≥20，25，30	≥20，25，30	≥20，25，30	≥20，25，30
Note: 1. The denominator in the table denotes the lattice brick indicator. 2. Thermal shock stability index is adjustable as per the requirements of customers