Silicon carbide smelting, the role of silicon carbide in the field of steelmaking?

The main chemical composition of silicon carbide in Feizhan Abrasives is SiC. The Mohs hardness of silicon carbide is 3000-3300 kg mm2, the hardness of Knoop is 2670-2815 kg, and the microhardness is 3300 kg per cubic mm. The density is generally considered to be gram mm3, and the natural bulk density of its silicon carbide abrasive is between gram mm3, and the specific gravity is.

It is mainly used for grinding and polishing hardness alloys, titanium alloys, stainless steel, copper, aluminum, zinc, ceramics, stones, agate, jade, fine jewelry, and electronic components. It can also manufacture abrasives and high-grade refractory materials.

You're asking too vaguely, and you don't know how. There are Acheson method, ESK and other methods for the preparation of silicon carbide, multi-furnace core method, silicon-carbon direct reaction method, high-temperature self-propagation method, and sol-gel method. Plasma method, laser method and many other methods.

Silicon carbide has applications in ironmaking, mainly in refractories for ironmaking. For example, the castable of the iron trench, the lining of the ladle, the torpedo tank or something, etc. But I don't know what the landlord is asking.

Si+C==(High Temperature)==SiC

I don't know what you're asking.

Silicon carbide. Role in the field of steelmaking:

1. The application of silicon carbide is through! Decades of experiments have concluded that there are better results in the steelmaking industry. Because it prevents the precipitation of carbides, increases the amount of ferrite, reduces the tendency of whitening, and can also improve and improve mechanical properties.

2. Silicon carbide can better increase the fluidity, stabilize the composition of molten iron, prevent segregation, and reduce the sensitivity of wall thickness, make the structure dense, the cutting surface smooth, and enhance the graphite nucleation ability and increase the graphite core.

3. For most casting products, silicon carbide.

A series of products can be well applied. Relatively for ductile iron.

It is a powerful oxygen absorber.

It can reduce the amount of nodularizing agent and improve the nodularization rate, and silicon carbide can eliminate the oxidation factor of molten iron, reduce the oxidation of the furnace wall, and prolong the life of the furnace wall by 30%.

Merit. 1. Silicon carbide can be used as a substitute for ferrosilicon trembling babs. And there will be no dust pollution in the furnace, the reaction speed is fast, and the eggplant ear is reduced. Merit.

2. Silicon carbide can reduce useful metal oxides to metals that are absorbed in steel, reduce the loss of molten steel, and increase output. Merit.

3. The heat energy of Qilu reaction generated during the oxidation of silicon carbide can reduce the amount of electricity used and shorten the operation time.

Summary. Because silicon carbide is a composite product, it can be deoxidized, silicon increased, carburized, temperature raised, inoculated, and the quality of molten steel can be improved in different periods.

Because silicon carbide is a composite product, it can be deoxidized, silicon increased, carbon increased, temperature raised, nurture brother, and the quality of molten steel can be improved in different periods.

Because of the suspicion that its cost is lower than that of ferrosilicon, many steel mills and foundries use it instead of ferrosilicon to increase the old Wang silicon carburization using Hanfeng, good effect, low quality, and a very cost-effective product.

Uses: 1: abrasives, grinding, polishing, sandblasting, etc. (silicon carbide sand, silicon carbide granular sand) silicon carbide is mainly used as an abrasive for the manufacture of grinding wheels, sandpaper, abrasive belts, oil stones, grinding blocks, grinding heads, abrasive paste, etc.

Silicon carbide can be used to manufacture consolidated abrasives, coated abrasives and free grinding, so as to process glass, ceramics, stone, jade, cast iron, stainless steel, floor tiles and some non-ferrous metals, cemented carbide, titanium alloys, high-speed steel props and grinding wheels.

2: Refractory materials (silicon carbide powder, silicon carbide particles).

Three: steelmaking, casting industry (silicon carbide balls, silicon carbide blocks, silicon carbide grains, silicon carbide silicon carbide as a steelmaking deoxidizer can make the quality of molten steel stable, and has the effect of refining grains, removing the total harmful impurities of molten steel, after the use of molten steel casting temperature is high, the billet is ***, the unit cost is low.

Four: photovoltaic industry, polishing, grinding, high-tech research and development and other industries (silicon carbide powder).

Hello, no. The difference between the two: silicon carbide is an inorganic substance, which is smelted at high temperature by a resistance furnace with raw materials such as quartz sand, petroleum coke, and wood chips.

Industrial silicon, also known as metalloid silicon, is a product smelted by silica and carbonaceous reducing agent in a submerged arc furnace. The use of both: silicon carbide is mainly used in non-ferrous metal smelting, in the iron and steel industry, in the metallurgical beneficiation industry, in building materials and ceramics, in the grinding wheel industry, and in the application of energy saving.

Industrial silicon is used as a deoxidizer and alloying agent in the steelmaking industry, as an inoculant and nodularizing agent in the iron casting industry, and as a reducing agent in the production of ferroalloys.

The production process of silicon carbide powder is characterized in that the steps are as follows:

1) Take silicon carbide raw materials, crush them in a crusher, and screen them to silicon carbide particles no more than 5mm, and then use a shaping machine to shape them to silicon carbide particles no more than 2mm, and oval particles account for more than 80%, and then pickle and remove impurities and dry;

2) the above-mentioned dried silicon carbide particles are crushed into the silicon carbide powder of d50= with a pulverizer, and when crushing, the current of the main engine of the mill is set to 65-75A, the flow rate of the fan is set to 40-50m3 min, and the speed of the analyzer is 400--600 rpm;

3) then use vortex type air flow classifier to classify silicon carbide powder, during classification, the fan flow rate of vortex type airflow classifier is 25-43m3 min, and the speed of classifying wheel is 2600--3300 rpm, the finished product A of particle size DS94= is separated from the grading port, and the semi-finished product of DS94 is separated from the cyclone port;

4) the semi-finished product separated by the vortex type air flow classifier cyclone outlet is then secondary graded with the impeller type air flow classifier, during the classification, the fan flow rate of the impeller type air flow classifier is 25-10m3 min, the speed of the classifying wheel is 1300--1700 rpm, the finished product B with particle size of DS94 = is separated from the classification port, and the by-product is separated from the cyclone port.

Sieving

Sieving is to divide particles and powders into particle segments of different sizes. A single TS vibrating screen can be equipped with 4 layers of screens, which can continuously sort 2-5 particle sizes and control a narrow particle size range.

Sift out impurities

The high-performance sieve can quickly remove large or small particles with a low percentage of slurry residue separation in the process of high flow processing. TS vibrating sieve can quickly remove the insoluble solid matter in all kinds of slurry, and continuously discharge the slag.

The common method is to mix quartz sand with coke, use the silica and petroleum coke in it, add salt and wood chips, put it in an electric furnace, heat it to a high temperature of about 2000 °C, and obtain silicon carbide powder after various chemical processes. Silicon carbide (SiC) is an important abrasive due to its great hardness, but its range of applications exceeds that of ordinary abrasives.

The silicon carbide production process is briefly described as follows:

Raw material crushing. The hammer crusher is used to crush the petroleum coke and crush it to the particle size required by the process.

Ingredients and mixing.

Ingredients and mixing are the processes of weighing and mixing according to the prescribed formula. The batching of this project adopts a platform, and the mixing adopts a concrete mixer, and the batching and mixing operations of petroleum coke and quartz sand are carried out in accordance with the process requirements.

Electric stove preparation. Electric furnace preparation is to re-trim and organize the furnace that was used last time so that it can be put into use again. The work includes cleaning the furnace bottom material, trimming the electrode, cleaning and repairing the furnace wall, removing the loading force, 1 gear, and checking and eliminating other defects of the furnace.

Furnace loading. Furnace loading is to fill the furnace with reaction materials, heat preservation materials and furnace core materials according to the specified charge categories, parts and sizes, and build the side wall of the melting furnace with the functions of heat preservation and material loading.

Electricity smelting. After the smelting furnace and the transformer are connected, power can be transmitted. 15min from the start of power transmission, an open flame was put into it, CO was ignited, and the smelting process lasted for 170h.

Cooling. After the smelting furnace is shut down, natural cooling is carried out, and then the grill is carried out (unloading the furnace wall, removing the lack of material) and continuing the free cooling.

Baked grading. Furnace classification is the process of removing crystalline blocks and graphite from the furnace and separating the first-class products, second-class products, graphite and other materials. The furnace classification method of this project adopts the out-of-furnace classification method, and the crystallization cylinder is manually split, and the lumpy crystallization cylinder is transported to the grading field for manual classification.

From the outside to the inside, the charge after high-temperature calcination is: unreacted material (which plays a role in heat preservation in the furnace), silicon oxycarbide (semi-reactive material, the main components are C and SiO. ), binder layer (is a very tightly bonded material layer, the main components are C, Sio % 60% SiC and Fe, Al, Ca, Mg carbonate), amorphous layer (the main component is 70% 90% SiC, and it is cubic SiC that is, -SiC, and the rest is C, SiO2 and Fe, A1, Ca, Mg carbonates), secondary product SiC layer (the main component is 90% 95% SiC, the layer has generated hexagonal SiC that is, a SiC, but the crystals are smaller, It is very fragile and cannot be used as an abrasive), the first-grade SIC layer (the SIC content is < 96%, and it is a coarse crystal of hexagonal SIC, that is, a SIC), and graphite in the furnace core.

In the above-mentioned layers, the unreacted material and a part of the oxide silicon carbide layer are usually collected as the waste material, and the other part of the oxygen silicon carbide layer is collected together with the amorphous matter, the secondary product, and some binders as the return material, and some of the binders with very tight bonding, large blockiness and many impurities are discarded. The first-class product is graded, coarsely crushed, finely crushed, chemically treated, dried and screened, and magnetically separated into black or green SiC particles of various particle sizes. To make silicon carbide powder, it also needs to go through a water separation process; To make silicon carbide products, it also needs to go through the process of molding and sintering.

Quartz sand + carbon (petroleum coke or charcoal or coal, the less ash, the better), energized (graphite powder core) heated to 2000 degrees.

Silicon carbide mill manufacturers recommend a Zhengzhou Maoxiang machinery for you is very good.

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