Recarburizers are used for refining steel recarburizers and cast
iron recarburizers, as well as other additives to recarburizers,
such as brake pad additives, as friction materials. The
recarburizer belongs to the external steelmaking and iron-making
carbon-increasing raw materials. High quality carbonizers are
essential additives for the production of high quality steel.
There are many kinds of raw materials for recarburizers, and the
production process is also different. There are various types of
wood, carbon, coal, coke, and graphite. There are many small types
under various classifications. High-quality recarburizers generally
refer to graphitized recarburizers. Under high temperature
conditions, the arrangement of carbon atoms is in the microscopic
form of graphite, so it is called graphitization. Graphitization
can reduce the content of impurities in the recarburizer, increase
the carbon content of the recarburizer, and reduce the sulfur
The recarburizing agent is used in casting, which can greatly
increase the amount of scrap steel, reduce the amount of pig iron
or use no pig iron. In the feeding mode of electric furnace
smelting, the recarburizing agent should be placed together with
the charging materials such as scrap steel, and the addition of
small doses can be added to the surface of the molten iron.
However, it is necessary to avoid feeding large quantities into the
molten iron to prevent excessive oxidation and the carbonization
effect is not obvious and the carbon content of the casting is
insufficient. The amount of the recarburizer added is determined
according to the ratio of other raw materials and the carbon
content. Different types of cast iron, choose different types of
recarburizers according to your needs. The characteristics of the
recarburizer itself select pure carbon-containing graphitized
materials to reduce excessive impurities in the pig iron. The
selection of the recarburizer can reduce the casting production
For casting, cast iron, cast steel, castings will have a carbon
requirement, then the carbonizer is to increase the carbon content
in the molten iron. For example, in the smelting, the common charge
is pig iron, scrap steel, and recycled material. The carbon content
of pig iron is high, but the purchase price is higher than that of
scrap steel. Therefore, increasing the amount of scrap steel,
reducing the amount of pig iron, and adding carbonizer can play a
role in reducing the cost of castings.
physical and chemical indicators
In the smelting process, due to improper ingredients or improper
loading and excessive decarburization, the carbon content in the
steel sometimes fails to meet the requirements of the top stage. At
this time, carbon is added to the molten steel. Commonly used
recarburizers include carbon-increasing pig iron, electrode powder,
petroleum coke powder, charcoal powder and coke powder. In the case
of converter smelting medium and high carbon steel, petroleum coke
containing little impurities is used as a recarburizer. The
requirement for the recarburizing agent for top-blown converter
steelmaking is that the fixed carbon is high, the content of ash,
volatile matter and sulfur, phosphorus, nitrogen and the like is
low, and it is dry, clean and moderate in particle size.
Its fixed carbon composition is:
w(C)>96%, volatile matter ≤1.0%, w(S)≤0.5%, w(moisture)≤0.55%,
particle size is 1-5mm.
The particle size is too fine to be easily burned, and when it is
too thick, it floats on the surface of the molten steel and is not
easily absorbed by the molten steel. For the induction furnace, the
particle size is 0.2-6mm, wherein the steel and other ferrous
metals have a particle size of 1.4-9.5mm, the high carbon steel
requires low nitrogen, the particle size is 0.5-5mm, etc., and the
specific need to smelt the workpiece according to the specific
furnace type. The specific types and details of the specific
judgment and selection.
1. Furnace input method:
The recarburizer is suitable for melting in an induction furnace,
but it is not the same depending on the process requirements.
(1) The use of a recarburizer in the intermediate frequency
electric furnace smelting can be added to the lower part of the
electric furnace according to the ratio or carbon equivalent
requirement, and the recovery rate can reach above 95%;
(2) If the amount of carbon is insufficient to adjust the carbon
content, firstly clean the slag in the furnace, add the
carbon-increasing agent, and increase the carbon solution by
electromagnetic heating, electromagnetic stirring or manual
stirring, and the recovery rate can be about 90%. The
low-temperature carbonization process is adopted, that is, when
only a part of the charge is melted, and the temperature of the
molten iron is low, all the carbon-reducing agents are added to the
molten iron at one time, and the solid charge is pressed into the
molten iron to prevent the iron from being exposed. Liquid surface.
This method can increase the carbon content by more than 1.0%.
2. Carbon increase outside the furnace:
(1) Spray graphite powder inside the bag
The graphite powder is used as a recarburizer, and the blowing
amount is 40kg/t, which is expected to increase the carbon content
of the molten iron from 2% to 3%. As the carbon content of the
molten iron gradually increases, the utilization rate of carbon
decreases, the temperature of the molten iron before the carbon
addition is 1600 ° C, and the average after the carbon increase is
1299 ° C. Spray graphite powder to increase carbon, generally using
nitrogen as carrier, but under industrial production conditions, it
is more convenient to use compressed air, and oxygen in compressed
air produces CO, chemical reaction heat can compensate part of
temperature drop, and CO reducing atmosphere is beneficial to
(2) Use of recarburizer when tapping
The 100-300 mesh graphite powder recarburizer can be placed in the
bag or flushed with the flow from the iron tapping tank. After the
molten iron is discharged, the carbon is dissolved and absorbed as
much as possible, and the carbon recovery rate is about 50%.
Recarburizers can be used as a material for cast iron
recarburizers, and artificial graphite, calcined petroleum coke,
natural graphite, coke, anthracite, and mixtures made of such
materials are commonly used.
Among the above various recarburizing agents, the best quality is
The main raw material for the manufacture of artificial graphite is
powdered high-quality calcined petroleum coke, in which asphalt is
added as a binder, and a small amount of other auxiliary materials
are added. After the various raw materials are mixed, they are
press-formed and then treated in a non-oxidizing atmosphere at 2500
to 3000 ° C to make them graphitized. After high temperature
treatment, the ash, sulfur and gas contents are greatly reduced.
Due to the high price of artificial graphite products, the
artificial graphite recarburizers commonly used in foundries are
mostly recycled materials such as chips, waste electrodes and
graphite blocks when manufacturing graphite electrodes, so as to
reduce production costs.
When smelting ductile iron, in order to make the metallurgical
quality of cast iron superior, the artificial carbon should be
2. Petroleum coke
Petroleum coke is a widely used recarburizer.
Petroleum coke is a by-product of refined crude oil. Residual oil
and petroleum asphalt obtained by vacuum distillation or vacuum
distillation can be used as raw materials for petroleum coke, and
then coke is obtained to obtain raw petroleum coke. The production
of raw petroleum coke is less than 5% of the amount of crude oil
used. The annual production of petroleum coke in the United States
is about 30 million tons. The raw petroleum coke has high impurity
content and cannot be directly used as a recarburizer. It must be
Raw petroleum coke has spongy, needle-like, granular and fluid
Sponge petroleum coke is produced by a delayed coking process. It
is usually used as a fuel for calcination because it has a high
sulfur and metal content, and can also be used as a raw material
for calcining petroleum coke. The calcined sponge coke is mainly
used in the aluminum industry and as a recarburizer.
The acicular petroleum coke is obtained by a delayed coking process
using a raw material having a high content of aromatic hydrocarbons
and a 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
Granular petroleum coke is a hard granule. It is a raw material
with a high content of sulfur and asphaltene. It is produced by
delayed coking and is mainly used as a fuel.
The fluid petroleum coke is obtained by continuous coking in a
fluidized bed. It is in the form of fine particles, has no
directional structure, high sulfur content and low volatile
The calcination of petroleum coke is to remove sulfur, moisture,
and volatiles. Calcination of raw petroleum coke at 1200~1350 °C
can make it a substantially pure carbon.
The largest user of calcined petroleum coke is the aluminum
industry, and 70% is used to make anodes that reduce bauxite.
Calcined petroleum coke produced in the United States accounts for
about 6% of cast iron recarburizers.
3. Natural graphite
Natural graphite can be divided into two types: flake graphite and
Microcrystalline graphite has a high ash content and is generally
not used as a carbon reinforcer for cast iron.
There are many varieties of flake graphite: high carbon flake
graphite needs to be extracted by chemical methods, or heated to
high temperature to decompose and volatilize the oxides. This flake
graphite has low yield and high price, and generally does not act
as a recarburizer; low carbon flakes Graphite has a high ash
content and should not be used as a recarburizer; it is mainly used
as a carbon reinforcer for medium carbon graphite, but it is not
used in large amounts.
4. Coke and anthracite
In the electric arc furnace steelmaking process, coke or anthracite
may be added as a recarburizer during charging. Induction furnace
smelting cast iron is rarely used as a recarburizer because of its
high ash and volatile content.
Packaging & Shipping
Packaging of diatomaceous bricks
1.on wooden pallets with plastic cover: wooden pallet size :930*930
2.Load weight of each pallet: 1.5-2.0 tons,
Shipping of diatomaceous bricks
1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quanlity and quantity
guaranteed, and also in accordance with the contract and customer's
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