98.5% min C Content Petroleum Coke Graphite Carbon Additive for Metallurgy Casting

Petroleum coke graphite coal carbon additive for metallurgy casting

There are many kinds of raw materials for carburetants, there are different production processes, there are wood carbon, coal carbon, coke, graphite and so on, which under the various categories and a lot of small species. High-quality carbon agent generally refers to the graphitization of the carbon agent, in high temperature conditions, the arrangement of carbon atoms in the micro-morphology of graphite, so called the graphitization. Graphitization can reduce the amount of impurities in the carbon agent, increase the carbon content of the carbon agent, reduce the sulfur content.

The use of carburetants in the casting can significantly increase the amount of scrap, reduce the amount of pig iron or no pig iron. Electric furnace smelting of the feeding method, the carbon agent should be with the scrap and other materials into the inside together, the addition of small doses can be added to the surface of the molten iron. But to avoid large quantities of molten iron to feed, in order to prevent excessive oxidation and the effect of carbon is not obvious and the cast carbon content is not enough. The addition of carbon agent, according to the ratio of other raw materials and carbon content to be set. Different types of cast iron, according to the need to choose different types of carbon agent. The characteristics of the carbon agent itself choose pure carbon-containing graphitizing substances, reduce excess impurities in pig iron, the choice of carbon agent can reduce the cost of casting production.

Petroleum coke graphite coal carbon additive for metallurgy casting

In the smelting process, due to improper ingredients or improper loading and decarbonization and other reasons, sometimes caused by carbon content in steel did not meet the requirements of the top, then to increase the carbon content of molten steel. Commonly used carbon agent with carbon pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder. In the case of converter smelting and high-carbon steels, petroleum coke containing little impurities is used as carbon. On the top blowing converter steel with carbon requirements is fixed carbon is high, ash, volatile and sulfur, phosphorus, nitrogen and other impurities content is low, and dry, clean, granular moderate.

The fixed carbon component is:
W (C)> 96%, volatiles ≤ 1.0%, w (S) ≤ 0.5%, w (moisture) ≤ 0.55%, particle size 1 - 5mm.
Granularity is too easy to burn easily, too thick to join after floating in the molten steel surface, not easily absorbed by molten steel. For the induction furnace particle size of 0.2-6mm, of which steel and other ferrous metal particle size in the 1.4-9.5mm, high carbon steel requires low nitrogen, particle size of 0.5-5mm, and so the specific needs of the furnace according to the specific type of smelting The type of detail and so the specific judgment and selection.

Petroleum coke graphite coal carbon additive for metallurgy casting

1. Furnace input method:
carburetant is suitable for melting in the induction furnace, but according to the specific requirements of the use of technology are not the same.
(1) in the IF furnace smelting in the use of carbon agent, according to the ratio or carbon equivalent requirements with the material added to the lower part of the furnace, the recovery rate of up to 95%
(2) If the carbon content is insufficient to adjust the carbon content, first slag in the furnace, plus carbon agent, through the molten iron temperature, electromagnetic stirring or artificial stirring to dissolve the carbon absorption, the recovery rate of about 90%, if The use of low-temperature carbon increase process, that is, only part of the furnace melting, molten iron liquid temperature is low, all the carbon agent added to the molten iron at one time, while the solid charge into the molten iron will not let it exposed iron Liquid surface. This method of iron liquid carbon up to 1.0% or more.
2. Furnace outside the carbon:
(1) package within the sprayed graphite powder
The use of graphite powder to do carbon agent, blowing into the amount of 40kg / t, is expected to make iron liquid carbon content from 2% to 3%. With the iron content of molten iron gradually increased, the utilization of carbon decreased, the temperature of carbon before the carbon temperature of 1600 ℃, the average after the increase of 1299 ℃. The use of nitrogen as a carrier, but in industrial production conditions, with compressed air more convenient, and compressed air in the air to produce CO, the chemical reaction heat can compensate for part of the temperature drop, and CO to restore the atmosphere conducive to Improve the carbon effect.
(2) the use of carbon agent when the iron
Can be 100-300 purpose graphite powder carburetant into the bag, or from the trough with the flow into the molten iron after the full mixing, as far as possible to dissolve the carbon absorption, carbon recovery rate of about 50%.

Petroleum coke graphite coal carbon additive for metallurgy casting, For casting, cast iron, cast steel, castings will have a requirement for carbon, then the carbon as the name suggests is to increase the carbon content of iron liquid, for example, in the melting of the commonly used charge for the pig iron, scrap, Pig iron has a high carbon content, but the purchase price is higher than that of scrap. Therefore, it is necessary to increase the amount of scrap and reduce the amount of pig iron and increase the amount of carbon, which can reduce the cost of casting.

Petroleum coke graphite coal carbon additive for metallurgy casting

1. Petroleum Coke carburetant

2. Low Nitrogen carburetant

3. Graphited carburetant

1. Artificial graphite
Among the above-mentioned various carbonizers, the best quality is artificial graphite.
The main raw material for making artificial graphite is powdered high-quality calcined petroleum coke, where asphalt is added as binder and then a small amount of other auxiliary materials are added. After a variety of raw materials with a good, it will be pressed and then formed in 2500 ~ 3000 ℃, non-oxidizing atmosphere to deal with, so that graphitization. After high temperature treatment, ash, sulfur, gas content are significantly reduced.
As the price of artificial graphite products is expensive, foundry commonly used artificial graphite carbon agent is the manufacture of graphite electrodes when the chip, waste electrodes and graphite blocks and other recycling materials to reduce production costs.
Melting ductile iron, in order to make the metallurgical quality of cast iron, carbon agent should be preferred artificial graphite.
2. Oil coke
Petroleum coke is currently widely used as a carbon agent.
Petroleum coke is refined by crude oil by-product, crude oil distillation or vacuum distillation of the residue and oil asphalt, can be used as the raw material for the manufacture of petroleum coke, and then get the coke after the oil coke. The production of petroleum coke is about 5% less than the amount of crude oil used. US annual production of petroleum coke about 30 million t. The high content of impurities in petroleum coke can not be directly used as a carbon agent and must be calcined.
There are sponge-like, needle-like, granular and flowable varieties.
Sponge-like petroleum coke is prepared by delayed coking, because of its high sulfur and metal content, usually used as calcined fuel, can also be used as calcined petroleum coke raw materials. Calcined sponge coke, mainly used for making aluminum and used as a carbon agent.
Acicular petroleum coke is made from delayed coking with high content of aromatic hydrocarbons and low impurity content. This coke has a needle-like structure that is easily broken, sometimes referred to as graphite coke, and is mainly used for the manufacture of graphite electrodes after calcination.
Granular petroleum coke is hard granular, is the use of sulfur and asphaltene content of raw materials, with delayed coking method, mainly used for fuel.
Flow of petroleum coke, is in the fluid bed with continuous coking method was made of small granular, non-directional structure, high sulfur content, low volatiles.
3. Natural graphite
Natural graphite can be divided into two kinds of scales graphite and microcrystalline graphite.
Microcrystalline graphite ash content is high, generally not used as cast iron by the carbon agent.
There are many varieties of flake graphite: high-carbon flake graphite need to be chemically extracted, or heated to high temperature so that the decomposition of the oxide, volatile, this scale graphite production is not much, the price is high, generally do not add carbon agent; Graphite in the high ash content, should not be used as a carbon agent; as a carbon agent is mainly carbon graphite, but the amount is not much.
4. Coke and anthracite
Electric arc furnace steelmaking process, can be charged with coke or anthracite as a carbon agent. Due to its high ash content and volatile content, induction furnace smelting cast iron is rarely used as a carbon agent.

Petroleum coke graphite coal carbon additive for metallurgy casting

The carburetants can be packed in a variety of standards such as 5 kg, 25 kg, 30 kg, 50 kg and 1 tonne high density polyethylene package.Jumbo bags packing: 0.75-1.15MT. or as customers' requirements.