Products
Magnesia Refractory Bricks I. Main Product Types Magnesia Bricks (MZ Series): Composition: MgO ≥ 90%, CaO ≤ 2.5%; Properties: Refractoriness ≥ 2000°C, thermal shock resistance 15–25 cycles; Bulk density: 2.8–3.0 g/cm³. Magnesia–Carbon Bricks (MT Series): Composite composition: MgO 60–80%, C 10–20%; Special process: addition of antioxidant (Al/Si alloy); High-temperature strength: flexural strength at 1600°C ≥ 15 MPa. Magnesia–Alumina Bricks (MA Series): Composition ratio: MgO 70–85%, Al₂O₃ 10–20%; Thermal shock resistance: ≥ 30 cycles (water quenching at 1100°C). II. Modern Production Processes Raw Material Processing System: Electrofused magnesia sand grading (grades 97, 98, and 99); Intelligent ore blending (MgO variation ≤ 0.3%); Composite bonding technology with organic binders: phenolic resin + pitch; Inorganic binders: magnesium sulfate + phosphates; Intelligent firing control in ultra-high-temperature tunnel kilns (1850–1950°C); Firing curve: # Optimized firing program if temperature < 800°C: heating rate 60°C/h; elif 800–1600°C: controlled reducing atmosphere; else: constant-temperature stage with ±5°C accuracy. III. Core Applications Application Fields Typical Equipment Technical Benefits Steel metallurgy converter lining life ≥ 5000 heats; Nonferrous metals—copper flash smelting furnace slag erosion resistance improved by 40%; Environmental protection and energy—waste incineration furnace alkali corrosion resistance ≥ 2 years; Building materials industry—cement rotary kiln transition zone thermal shock stability 35 cycles. IV. Performance Advantages Compared with Traditional Materials Refractoriness: 2000°C vs. high-alumina brick 1790°C; Slag resistance: R₂O erosion rate reduced by 60%; High-temperature strength: 1600°C, compressive strength retention ≥ 80%; Economic Benefit Analysis Initial cost: 50–60% lower than chrome-corundum bricks; Consumption per ton of steel: 0.8–1.2 kg/t (converter application). V. Latest Physicochemical Specifications (GB/T 2026-MG) 1. Basic Properties: – Bulk density: 2.9–3.2 g/cm³ (MT series); – Apparent porosity: ≤ 16% (MA series). High-Temperature Characteristics: – Load-softening temperature: ≥ 1700°C (0.2 MPa); – Slag resistance (CaO/SiO₂ = 3): ≤ 1.2 mm/24 h. Special Indicators: – Oxidation resistance (1400°C/5 h): weight gain ≤ 1.5%; – Hydration resistance: wet-heat test ≥ 95%.
Direct-bonded magnesia-chrome brick
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1100°C). Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Dimensional finishing with precision ±0.3 mm. Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Spinel pre-synthesis at 1600°C; Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering under nitrogen protection. Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Resistance to alkali erosion improved by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Copper-smelting furnace slag line—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Cement kiln transition zone—thermal consumption reduced by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Glass-furnace heat-storage chamber—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|------------------------|------------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free product); - Heat recovery rate: ≥75% (recycling of waste bricks).
Magnesia-chrome refractory brick
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1100°C) Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Dimensional finishing with precision ±0.3 mm. Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Spinel pre-synthesis at 1600°C; Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering under nitrogen protection. Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Copper-smelting furnace slag line—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Cement kiln transition zone—thermal consumption reduced by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Glass-furnace regenerator—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|-----------------------|-----------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free product); - Heat recovery rate: ≥75% (recycling of waste bricks).
Magnesium-Iron-Aluminum Composite Brick
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1100°C) Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Precision finishing of dimensions (tolerance ±0.3 mm). Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Pre-synthesis of spinel (1600°C); Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering (nitrogen protection). Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased by 3 times; Excellent creep resistance at 1700°C. Magnesia-Zirconium Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Resistance to alkali erosion improved by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Slag line in copper smelting furnaces—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Transition zone in cement kilns—reduced thermal consumption by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Heat-storage chamber in glass furnaces—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|-----------------------|-----------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free products); - Heat recovery rate: ≥75% (recycling of waste bricks).
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1100°C). Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Dimensional finishing with precision ±0.3 mm. Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Spinel pre-synthesis at 1600°C; Nano-scale batching (D50 ≤ 1 μm); Atmosphere-controlled sintering under nitrogen protection. Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Slag line in copper smelting furnaces—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Transition zone in cement kilns—reduced thermal consumption by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Heat-storage chamber in glass furnaces—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|------------------------|------------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free products); - Heat recovery rate: ≥75% (recycling of waste bricks).
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1100°C) Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Precision finishing of dimensions (tolerance ±0.3 mm). Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Spinel pre-synthesis at 1600°C; Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering under nitrogen protection. Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Slag line in copper smelting furnaces—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Cement kilns—transition zone; Heat consumption reduced by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Glass furnaces—heat-storage chambers; Maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|-----------------------|-----------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free products); - Heat recovery rate: ≥75% (recycling of waste bricks).
Magnesium-aluminum spinel brick
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1,700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1,100°C) Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1,800°C, chromite ore at 1,600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1,750–1,850°C for 24 hours); Dimensional finishing with precision ±0.3 mm. Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Spinel pre-synthesis at 1,600°C; Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering under nitrogen protection. Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1,700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Slag line in copper smelting furnaces—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Transition zone in cement kilns—reduced thermal consumption by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Heat-storage chamber in glass furnaces—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|------------------------|------------------------| | Load-Softening Point (°C) | ≥1,700 | ≥1,650 | ≥1,680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free products); - Heat recovery rate: ≥75% (recycling of waste bricks).
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance: ≥30 cycles (water quenching at 1100°C) Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Precision finishing of dimensions (tolerance ±0.3 mm). Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Spinel pre-synthesis (1600°C); Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering (nitrogen protection). Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Copper-smelting furnace slag line—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Cement kiln transition zone—thermal consumption reduced by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Glass-kiln heat-storage chamber—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|-----------------------|------------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free product); - Heat recovery rate: ≥75% (recycling of waste bricks).
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1,700°C; Thermal-shock resistance ≥30 cycles (water quenching at 1,100°C). Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1,800°C, chromite ore at 1,600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1,750–1,850°C for 24 hours); Precision finishing of dimensions (tolerance ±0.3 mm). Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Pre-synthesis of spinel (1,600°C); Nano-scale batching (D50 ≤ 1 μm); Atmosphere-controlled sintering (nitrogen protection). Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased threefold; Excellent creep resistance at 1,700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Slag line in copper smelting furnaces—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Transition zone in cement kilns—reduced thermal consumption by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Heat-storage chamber in glass furnaces—maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|-----------------------|------------------------| | Load-Softening Point (°C) | ≥1,700 | ≥1,650 | ≥1,680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free products); - Heat recovery rate: ≥75% (recycling of waste bricks).
Electrofused Re-bonded Magnesia-Chrome Brick
Technical Specifications for Alkaline Refractory Bricks—Magnesia-Chrome Bricks Main Type: Direct-Bonded Magnesia-Chrome Brick (MG-15) Composition: MgO 60–70%, Cr₂O₃ 12–18% Characteristics: Direct-bonding ratio ≥85% at 1700°C; Thermal-shock resistance ≥30 cycles (water quenching at 1100°C). Electrofused Re-bonded Magnesia-Chrome Brick (MGR-20): Electrofused synthetic material content ≥80%; Apparent porosity ≤14%; Slag penetration resistance improved by 50%. Production Process: Pre-sintering of raw materials (magnesia sand at 1800°C, chromite ore at 1600°C); High-pressure forming (300–400 MPa); Ultra-high-temperature firing (1750–1850°C for 24 hours); Precision finishing of dimensions (tolerance ±0.3 mm). Technical Specifications for Magnesia-Alumina Bricks Innovative Type: Spinel-Reinforced (MA-85): MgO 80–85%, Al₂O₃ 10–15%; Spinel phase ≥25%; Thermal conductivity: 2.1 W/(m·K). Gradient Composite Magnesia-Alumina Brick: Working face—corundum coating (100 μm); Transition layer—MgO/Al₂O₃ = 70/30; Backing layer—porous structure (porosity 30%). Key Processes: Pre-synthesis of spinel (1600°C); Nano-scale batching (D50 ≤1 μm); Atmosphere-controlled sintering (nitrogen protection). Technical Specifications for Magnesia-Zirconia Bricks New Product: Zirconia-Toughened (MZ-10): ZrO₂ 8–12% (sub-micron grade); Fracture toughness increased by 3 times; Excellent creep resistance at 1700°C. Magnesia-Zirconia Composite Brick (MZ-20): MgZrO₃ as the primary crystalline phase; Enhanced alkali-corrosion resistance by 60%; Life-cycle cost reduced by 40%. Application Comparison and Analysis: Optimal Application Scenarios and Economic Benefits Magnesia-Chrome Brick: Slag line in copper smelting furnaces—service life 12–18 months (compared with the conventional 8 months). Magnesia-Alumina Brick: Cement kilns—transition zone; Heat consumption reduced by 0.8 GJ per ton of clinker. Magnesia-Zirconia Brick: Glass furnaces—heat-storage chambers; Maintenance interval extended to 5 years. Physicochemical Performance Comparison (GB/T 2026): | Indicator | Magnesia-Chrome Brick | Magnesia-Alumina Brick | Magnesia-Zirconia Brick | |-------------------------|-----------------------|------------------------|-------------------------| | Load-Softening Point (°C) | ≥1700 | ≥1650 | ≥1680 | | Thermal-Shock Resistance (cycles) | 30 | 35 | 25 | | Slag Penetration (mm) | ≤1.5 | ≤2.0 | ≤1.0 | Environmental Indicators: - Hexavalent chromium leaching: ≤0.07 mg/L (new chromium-free products); - Heat recovery rate: ≥75% (recycling of waste bricks).
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