Sintered Microporous Alumina-Carbon Bricks

Korun Company ensures long service life and energy efficiency for blast furnaces through strict procurement of premium raw materials.

Sintered microporous alumina-carbon bricks are a primary material for constructing large-volume blast furnaces. Widely used in furnace bodies and cooling stave embedding, they directly impact furnace lifespan, utilization efficiency, and enterprise profitability. Produced with high-purity selected raw materials, our bricks undergo high-pressure molding, drying, and carbon-embedded high-temperature sintering. They exhibit high strength, excellent erosion resistance, and abrasion resistance, meeting the harsh demands of intensified blast furnace smelting. With stable thermal shock resistance and prolonged service life, our cooling stave bricks are uniquely designed. We offer dozens of customizable brick types with consistent quality, precise dimensions, rational packaging, easy installation, and comprehensive after-sales services.

I. Raw Materials & Auxiliary Materials: Sources and Composition

II. Production Process Overview：

(1) Procure high-quality raw materials from pre-qualified suppliers. Bauxite undergoes specialized processing, including primary and secondary roller crushing, followed by vibration screening to achieve optimal particle gradation.

(2) Professional metering and mixing personnel supervise raw material quality. Ingredients are weighed with an accuracy of ±1.5%.

(3) Dry-mix prepared raw materials in a sand mixer for 1-2 minutes. Gradually add pre-weighed resin and mix thoroughly for 8-10 minutes. Cure the mixture for at least 8 hours.

(4) High-pressure molding is conducted using 630-ton or 400-ton presses based on brick dimensions. Ensure uniform pressure to achieve a green density of 2.85g/cm³, dimensional accuracy within ±1mm, and defect-free appearance. Qualified semi-finished products are dried in kiln chambers after sampling inspection.

(5) Inspect and load dried bricks into kilns with 200-300mm gaps filled with compacted coke powder. Seal the top with sand and double-seal firewalls and kiln doors to prevent oxidation.

(6) Strictly control the firing schedule. Final sintering temperature must reach 1500-1550°C with a holding time of 20-24 hours.

(7) Natural cooling is critical. Forced cooling is prohibited. Cool bricks to below 200°C before unloading: 30-35 days in summer and 20-30 days in winter.

(8) Inspect products piece by post-cooling. Qualified products are sorted by batch and type. Conduct comprehensive physical-chemical tests on sampled batches. Only certified products enter storage; substandard ones are strictly rejected.

III.Inspect and classify products during packaging. Dimensional tolerance is controlled within ±0.5mm. Clearly mark positive/negative grading standards on carton surfaces.

IV. Product Physical-Chemical Indicators