Our value is to provide our customers with the highest quality products according to their blueprint and the specification.Moreover,one of our sole features is to provide our customers with the professional designing and based on the sample they provide.
Our carbon graphite products for nonferrous metal metallurgical processing include boat, mold, shunt, sleeve, crucible, crystallizer, stem bar, agitator, rotor rod, and impeller. These products are used for analysis, metal melting, high temperature welding, pressure sintering, continuous casting, or degassing in the aluminum industry. The raw materials adopted to produce these products have high purity, high density, high mechanical strength, good thermal stability, strong resistance to shock, scouring, erosion, oxidation, high temperature, thermal shock, and metallic solution soaking, as well as a long service life.
The graphite rotor works continuously at the speed of 200r/min to 400r/min inside the aluminum melt with the temperature of 750℃. We adopt high-quality graphite to produce the rotor and make an anti-oxidation coating on its surface, thus extending its service life into 50 to 60 days.
Working Principle of the Graphite Rotor
The graphite rotor is composed of rotor rod and nozzle. Driven by the drive system, the graphite rotor rotates. The argon gas or nitrogen gas blown into the aluminum melt is scattered to form many small bubbles by the graphite rotor rotating at a high speed. These bubbles are dispersed in the molten metal. The rotating rotor also promotes the hydrogen and inclusions inside the aluminum melt to diffuse and to contact with bubbles. The bubbles absorb the hydrogen and oxidation slag inclusions by the gas partial pressure difference and surface adsorption principle. The hydrogen and inclusions are then brought out of the melt surface by the rising bubbles, so the melt is purified.
Main Reasons for the Damage of the Graphite Rotor
High Temperature Oxidation
Visible oxidation phenomenon of the graphite will appear when the temperature exceeds 600℃. The products of the oxidation reaction are CO and CO2 gases which can not protect the rotor. In general, the degassing tank can not be sealed completely and there is no protective gas inside the internal chamber of most tanks, so the oxidation of the graphite rotor is inevitable. Oxidation makes the shaft diameter of the rotor shaft become gradually smaller till fracture.
Liquid Aluminum Erosion
Immersed into the liquid aluminum of the degassing tank, the graphite rotor usually rotates at the speed of 200r/min to 400r/min and agitates the liquid aluminum strongly. The liquid aluminum will produce strong scouring and friction to the rotor. The part of rotor rod contacting with the liquid level will taper off and finally fracture.
Effect of the Drive System
If the drive system of the degassing unit is unstable, especially when its connection with the rotor is not concentric, the rotor will sway during operation. This will cause friction between the rotor and the sealing plug, thus resulting into damage of the rotor. In addition, the swaying of the rotor will exacerbate the tumbling of the liquid level and thus aggravate the oxidation and erosion of the rotor, which will accelerate the wear of the rotor.
The casting of continuously pouring into liquid metal through one end of the crystallizer and pulling out the formed material from the other end is called continuous casting method. It is suitable for the production of iron, steel, copper, aluminum, magnesium, and other casts that have invariant sectional form and large length. Both the production efficiency and the metal utilization are high. When used with a rolling mill to form a production line, a lot of energy can be saved. The idea of continuous casting was proposed by British H. Bessemer in 1857. Restricted by the technical conditions at the time, it did not receive practical applications. Until the 1930s, this method was successfully used for the casting of copper and aluminum alloys. By the 1950s, continuous casting had been fully promoted in countries around the world.
The crystallizer is the key of the continuous casting equipment. At present, the crystallizer for the nonferrous metal casting usually adopts graphite materials which have good thermal conductivity and a certain degree of strength. The formed material has square, rectangular, round, plate-shape, tubular or other specially shaped sections.
The graphite crystallizer produced by our company is applicable to the continuous casting of various nonferrous metals. It has high size precision, excellent performance and long service life. Compared with similar products from other companies, our product has a higher cost-effective advantage. It has been well received by users since its launch.
We provide graphite mold, graphite groove, graphite crucible, and other products. The graphite crucible is widely used for the smelting of alloyed tool steel as well as the melting of nonferrous metals and their alloys in metallurgical, casting, mechanical, chemical and other industrial sectors. Our products have the following features.
1. According to the service conditions (rapid temperature change) of the graphite crucible, our product is specially designed to have good thermal stability, thus ensuring the reliability of the product.
2. The even, fine matrix design delays the erosion of the crucible.
3. Our product has a strong resistance to thermal shock, so any processing can be conducted.
4. The adding of a special material greatly improves acid resistance and prolongs the service life of our product.
5. High-content fixed carbon guarantees good thermal conductivity, shortens the melting time, and significantly reduces energy consumption.
6. The strict control of the material composition ensures that the graphite crucible causes no pollution to the metal dissolved in it.
7. The stability of the product quality is more fully ensured by the high pressure forming method and quality control system.
In addition, our graphite crucible has high purity and attractive appearance. Some product can work for a long time below 2500℃ in a vacuum or non-oxidizing atmosphere.
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Our Graphite Crucible for Analysis is bright, clean, compact, and high-purity. The strong acid and strong base have little effect on the product at room temperature. Using this product for acid melting or alkali melting will introduce no impurity.
The graphite melting crucible for exothermic welding is used for the lightning protection and grounding as well as cathodic protection in railway, underground, transformer substation, nuclear power station, power plant, petrochemical warehouse, microelectronic factory, airport, communication base station and other large buildings. The graphite material is required to resist oxidation, high temperature, and thermal shock. We can produce products with various specifications and products can also be made according to the drawings provided by customers.
Nonferrous Metal Processing Used Graphite Component | Graphite Accessory for Non-ferrous Metal Machining | Non-ferrous Metal Making Process Used Graphite Fitting | Graphite Parts for Nonferrous Metal Processing
QINGDAO TENNRY CARBON CO., LTD. Copyright Technical by GLOBAL-EASY