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High-Quality Fused Cast AZS Block RTK-AZS36 from China Suppliers & Factory - Ideal for Glass Furnaces
Brief Introduction
RTK fused cast AZS blocks are made of high-quality purified raw materials, using a special electric arc furnace, and a fused cast process that has undergone long arc melting and oxidation treatment. This process has almost no carbon contamination from the electrode. Due to the oxidation fused cast process and the use of high-purity raw materials, RTK fused cast AZS series have special and high resistance to the corrosion of molten glass, and have little contamination to the molten glass.
Fused cast AZS products can be divided into 41# AZS block (RTK-AZS41), 36 # AZS block (RTK-AZS36) and 33 # AZS block(RTK-AZS33) according to the different ZrO₂ content in the chemical composition. In addition, on the basis of RTK-AZS36 and RTK-AZS33 manufacturing processes, the content of corresponding chemical components of SiO₂ and Na₂O has been reduced, and two products, 36 # low silicon low sodium AZS blocks (RTK-AZS36D) and 33 # low silicon low sodium AZS blocks (RTK-AZS33D), have been formed. These five products are further classified according to different casting methods, which can meet the different use requirements of fused cast products in glass furnaces.
RTK-AZS36 is a standard oxidation fused cast AZS block, which has the characteristics of particularly high resistance to the corrosion of molten glass and low contamination, and its performance in these two aspects is balanced. It is applicable to the parts in direct contact with the molten glass in the glass furnace, such as the side wall of the melting end, the paving tiles and the doghouse.
Chemical Composition
| CHEMICAL COMPOSITION | TYPICAL VALUE |
| SiO₂% | 13.0 |
| Ai₂O₃% | The Remainder |
| ZrO₂% | 36.5 |
| Fe₂O₃＋TiO₂＋CaO＋MgO＋Na₂O＋K₂O% | ≤2.0 |
Physical Property
| PHYSICAL PROPERTY | TYPICAL VALUE |
| Bulk density (dense part) g/cm³ | 3.90 |
| Apparent porosity (dense part) g/cm³ | 0.8 |
| Initial precipitation temperature of vitreous phase°C | 1400 |
| Vitreous phase exudation (1500°CX4hr)% | 2.3 |
| Anti-molten glass erosion speed under static condition mm/24hr(1500°CX36hr,ordinary soda lime glass) | 1.3 |
| Bubble release rate%(1300°CX10hr,ordinary soda lime glass) | 1.0 |
| CALCULATE SPECIFIC GRAVITY | |
| Ordinary casting /inclined casting g/cm³ | 3.55 |
| Quasi-non shrinkage casting g/cm³ | 3.80 |
| Non shrinkage casting g/cm³ | 3.85 |
Frequently Asked Questions
What are the main raw materials and processes used for RTK fused cast AZS blocks?
RTK fused cast AZS blocks are manufactured from high-quality purified raw materials using a specialized electric arc furnace. The production includes a fused cast process with long arc melting and oxidation treatment, which effectively eliminates carbon contamination from the electrode.
How are the different types of RTK fused cast AZS blocks classified?
They are categorized based on their ZrO₂ content into 41# AZS block (RTK-AZS41), 36# AZS block (RTK-AZS36), and 33# AZS block (RTK-AZS33). Additionally, low silicon low sodium versions like RTK-AZS36D and RTK-AZS33D are available.
What is the typical chemical composition of the RTK-AZS36 block?
The RTK-AZS36 block typically contains 36.5% ZrO₂, 13.0% SiO₂, and the remainder is Al₂O₃ (Ai₂O₃), with impurities (Fe₂O₃＋TiO₂＋CaO＋MgO＋Na₂O＋K₂O) kept at or below 2.0%.
Where should the RTK-AZS36 block be installed in a glass furnace?
Due to its balanced, high resistance to molten glass corrosion and low contamination, it is ideal for areas in direct contact with molten glass, such as the side wall of the melting end, paving tiles, and the doghouse.
What are the physical properties and thermal resistance of these blocks?
They feature a bulk density of 3.90 g/cm³ (dense part), an apparent porosity of 0.8, and an initial precipitation temperature of the vitreous phase of 1400°C. Under static conditions (1500°C for 36 hours in ordinary soda lime glass), the erosion speed is 1.3 mm/24hr.
How does the specific gravity vary by casting method?
The calculated specific gravity is 3.55 g/cm³ for ordinary/inclined casting, 3.80 g/cm³ for quasi-non shrinkage casting, and 3.85 g/cm³ for non-shrinkage casting.