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).
Magnesia iron spinel brick is a high-performance chrome-free basic refractory material developed by Zhengzhou Jinshan Refractory. It is produced using high-purity magnesia and pre-synthesized magnesia-iron spinel as main raw materials. This product offers outstanding kiln coating formation, strong thermal shock resistance, and excellent corrosion resistance against cement clinker and alkali salts.
It serves as an ideal chrome-free alternative to traditional magnesia-chrome bricks, particularly suitable for the burning zone of cement rotary kilns. Jinshan magnesia iron spinel bricks provide superior coating adhesion while maintaining structural integrity under high thermochemical loads, effectively extending service life and reducing environmental impact.
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 Alumina Spinel Brick
Magnesium alumina spinel brick is a high-performance composite basic refractory material independently developed by Zhengzhou Jinshan Refractory. It is made from high-purity magnesia and pre-synthesized magnesia-alumina spinel. The product combines excellent thermal shock resistance, high refractoriness under load, and strong chemical corrosion resistance. It is especially suitable for transition zones, burning zones of cement rotary kilns, and other high-temperature areas in the steel industry.
Compared with traditional magnesia bricks, Jinshan magnesia alumina spinel bricks offer significantly improved thermal shock stability and coating adhesion, effectively extending kiln lining life and reducing overall refractory costs.
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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