Product Application
Parameters in YS/T 285-2012 standard:
TY-1 grade: apparent density not less than 1.55g/cm ³, true density not less than 2.04g/cm ³, compressive strength not less than 35.0MPa, CO ₂ reactivity (residual polarity) not greater than 83.0mg/(cm ² · h), permeability not greater than 3 × 10 ⁻⁹ m ², room temperature resistivity not greater than 57 Ω· m, thermal expansion coefficient (10 ⁻⁶/K) not greater than 4.5, ash content not greater than 0.5%.
TY-2 grade: apparent density not less than 1.52g/cm ³, true density not less than 2.02g/cm ³, compressive strength not less than 32.0MPa, CO ₂ reactivity (residual polarity) not greater than 73.0mg/(cm ² · h), permeability not greater than 4.5 × 10 ⁻⁹ m ², room temperature resistivity not greater than 62 Ω· m, thermal expansion coefficient (10 ⁻⁶/K) not greater than 5.0, ash content not greater than 0.8%.
This standard also specifies the allowable size deviation for pre-baked anode carbon blocks:
The size requirements are usually: length 1750mm x width 740mm x height 620mm (there may be some fluctuation range).
The relative allowable deviation of length shall not exceed ± 1.0%.
The relative allowable deviation of width shall not exceed ± 1.5%.
The relative allowable deviation of height shall not exceed ± 3.0%.
The nonstraightness shall not exceed 1% of the length.
In practical applications, it is also necessary to refer to specific product standards and technical requirements. If you need to know more accurate specifications, it is recommended to directly contact the manufacturer or supplier of pre-baked anode carbon blocks to obtain detailed information for specific products.
In addition, there is an internal control standard document for raw anode and pre-baked anode carbon blocks available for reference:
The size requirements for the raw anode carbon block are length 1770mm x width 742.5mm x height 623mm, allowable length deviation ± 5mm, allowable width deviation ± 5mm, allowable height deviation ± 15mm, and small straightness<0.3%; The physical and chemical indicators of the anode require a bulk density of 1.63g/cm ³ or higher; The weight of the anode carbon block is the design value ± 20kg/block.
The size requirements for pre-baked anode carbon blocks are length 1750mm x width 740mm x height 620mm; The allowable deviation of the size of the pre-baked anode should comply with the regulations of length not exceeding ± 1.0%, width not exceeding ± 1.5%, height not exceeding ± 3.0%, and non straightness not exceeding 1% of the length.
Pre-baked anode carbon block is an indispensable and important raw material in the aluminum electrolysis industry.
It is usually made from petroleum coke, asphalt, and other main raw materials through a series of complex production processes. Pre-baked anode carbon blocks play a crucial role in the aluminum electrolysis process.
Its main functions include:
- Good conductivity: It can effectively conduct current and provide stable electrical support for the aluminum electrolysis process.
- Participate in electrochemical reactions: During the electrolysis process, the anode undergoes an oxidation reaction.
- Maintain stable operation of the electrolytic cell: It has good physical and chemical properties and can withstand high temperatures, strong corrosive environments, etc. during the electrolysis process.
The quality of pre-baked anode carbon blocks has a significant impact on the current efficiency, energy consumption, product quality, and lifespan of aluminum electrolysis cells. High-quality pre-baked anode carbon blocks should have good conductivity, thermal shock resistance, oxidation resistance, and low slag-dropping rate.
In the production process, it is necessary to strictly control the quality of raw materials, proportion of ingredients, molding process, roasting temperature, and other parameters to ensure that the performance of pre-baked anode carbon blocks meets the requirements of aluminum electrolysis.
Common performance testing methods for pre-baked anode carbon blocks:
- Measurement of room temperature resistivity: According to the methods specified in relevant standards (such as YS/T 63.2-2023), this index can reflect the conductivity of the carbon block.
- Air reactivity determination: A specialized pre-baked carbon block anode air reactivity tester can be used, such as a tester according to standards such as ISO 12989-1:2000 and YS/T 63.11-2006. Evaluate the degree of reaction between the sample and air by measuring parameters such as mass loss under certain temperature and air conditions.
- Internal crack detection:
Automatic machine hammering method voiceprint recognition: using a striking mechanism to strike a charcoal block, receiving the vibration of the charcoal block through a probe, and converting it into sound for transmission to a computer. Fast Fourier transform is used to obtain the peak amplitude of different surface signals of the charcoal block in a specific frequency range, and then data normalization is performed to establish a neural network for analysis, to determine whether there are cracks inside the charcoal block.
Resistance detection method: Using a detection system consisting of multiple electrode rod arrays, measure the resistance of different areas of the carbon block. The industrial control machine controls the electrode rod to contact different areas of the carbon block, measures multiple sets of current values, and determines whether there are cracks and their locations inside the carbon block based on the current values. This method can automatically identify and locate internal cracks in pre-baked anode carbon blocks with high recognition accuracy.
In addition, for the performance testing of pre-baked anode carbon blocks, other aspects of testing may also be involved, and the specific testing methods will be selected and determined according to production needs and relevant standards. In actual testing, to ensure the accuracy and reliability of the test results, it is necessary to strictly follow standard methods and use calibrated and validated testing equipment. At the same time, it is also important to regularly maintain and calibrate the testing equipment.
The production process of pre-baked anode carbon blocks mainly includes the following steps:
- Raw material processing: Using petroleum coke as raw material, it is processed into a particle size that meets the process requirements through processes such as calcination, intermediate crushing, screening, and fine crushing.
- Ingredients: Mix petroleum coke, coal tar pitch, and other raw materials in a certain proportion to ensure the quality of the product.
- Pinching: Put the prepared ingredients into the kneading machine for kneading, so that all the ingredients are fully mixed evenly.
- Molding: Place the mixed and kneaded materials into a molding machine, and use methods such as extrusion and vibration to produce a green body of pre-baked anode carbon blocks.
- Roasting: Place the green body into a roasting furnace and roast it at a high temperature to achieve a certain strength and physical and chemical properties.
- Cleaning: Clean the pre-baked anode carbon block after baking to remove surface dust and impurities.
The above is the general production process for pre-baked anode carbon blocks, and the specific production process may vary depending on the manufacturer and product.
