Processing of steel scrap

The processing of steel scrap differs from different kind of refractory material quality and shapes. Breakable and irregular shape lumps can be broken by the hammering of heavy punch, Extra thick and extra long scraps should be cut into proper sizes by flame cutter. The scraps with even larger sizes can be broken with blasting method. Thick waste steel plate and merchant steel should be cut with shearing machine. Light scraps with small volume weight like offcut of light sheets, steel wire, waste car shell, should be compressed to blocks with packer and then bundled. The steel cuttings produced by cutting should be compressed to blocks by briquetting machine after deoiling. Scraps mixed with other kind of metals ashould be broken, then get steel scrap with magnetic separation. A new technique of breaking under -50～-100℃ low temperature with the help of liquid nitrogen has been developed in recent years, but the problem of separating steel scrap and nonferrous metal and other impurities was not completed solved. The use of mixed scraps should be kept within a certain portion to avoid affecting the quality of steel.

Magnetic separation
Magnetic separation is to use the magnetism difference between the different material in solid waste to separate with inhomogeneous magneto, it is the most effective method in separating ferrous metals. After solid waste is put into magnetic separator, magnetic particles will be magnetized under the effect of inhomogeneous magneto, and then sucked into the cylinder by the force of magnetic field, then discharged. Non-magnetic particles stay in. The magnetic sources adopted in magnetic separation are usually electromagnet and permanent magnet.

Cleaning
It is to use different kind of chemical solvents or hot surface active agent to clean up the greasy dirt, rust and sidiment on the surface of scrap. Usually used for generators, bearings, gears that are polluted by grease, lubricant, oil, etc.

Preheating
Scraps are usually polluted by oil, lubricating grease, etc., the oil and lubricating grease which are unable to evaporate immediately could pollute the molten metal. For open storage scaps, after affected by moisture, as it contains moisture and other easily vaporized material like lubricating grease, it could expand under high temperature in furnaces. Therefore, it should be preheated with flames to remove the moisture and grease, then put into furnaces.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Processing of steel scrap
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Refractories and Classification of Refractories

Refractories are the raw materials which are resistant to heat and exposure to different degrees of mechanical stress and strain, thermal stress and strain, corrosion/erosion from solids, liquids and gases, gas diffusion, and mechanical abrasion at various temperatures. In simplified language, they are considered to be materials of construction which are able to withstand high temperatures. Refractories are usually inorganic non-metallic materials with refractoriness greater than 1500 deg C. They belong to coarse-grained ceramics having microstructure which is composed of large grains. The basis of body is coarse-grained grog joined by fine materials.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar,china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source:Refractories and Classification of Refractories
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The more details of graphite electrodes

Ultra-high power graphite electrodes refer to graphite electrodes that allow the use of current densities greater than 25 A / cm2. Ultra-high power graphite electrode is mainly used in ultra-high power electric furnace and ladle furnace.
Graphite electrodes are manufactured with high quality refractory raw material including petroleum cokes, needle cokes and coal-tar-pitch through the production process of calcining, crushing, burden, mixing kneading, extruding, baking, impregnation, graphitization, manufacturing, packing.

Our refractory products are characterized by superior compact structure, good electrical and thermal conductivity, high mechanical strength and high resistance to oxidation and corrosion in high temperature.

The graphite electrodes are widely use in electric are furnaces and ladle refining furnaces for steel making and used in electric smelhing furnaces for producing industrial silicon, yellow phosphorus, corundum, nonmetals and so on. HP Graphite electrodes is one essential part of the refractory raw material industry.

There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.

Article Source: HP Graphite Electrode
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Function of taphole clay

Stemming is used to seal the taphole refractory, at present there are water stemming and can be divided into two types: anhydrous stemming, the former is used in low pressure, strengthening smelting degree is not high, the small blast furnace, the latter in high top pressure, high degree of intensification of smelting of large and medium blast furnace.
Stemming form can be divided into two parts - refractory aggregate and binder. Refractory aggregate means corundum, mullite insulating firebrick, flint clay and other refractory raw material and modified materials such as coke, mica.Binder for water or organic material such as tar pitch and phenolic resin, also adding SiC Si3N4, expansive agent and additive, etc.Aggregate in a certain size and weight matrix, under the harmonic of binder has certain plasticity, thus can through the mud gun hitting iron mouth to block the molten iron.
With water as a bond is called the water stemming, tar, organic material such as resin as binder, called anhydrous stemming.

Main functions:
1) Wall, taphole requirements stemming good filling and sintering;
2) The stability of the iron to stemming easy open hole and resistance to erosion, erosion;
3) Protecting hearth, demand stemming rapid heating without crack, and the combination of old and new stemming high strength;
4) The opening performance is good, open machine drilling bit easily;
5) Moderate plasticity, facilitate mud gun operation and the formation of iron mouth balling;
6) Good volume stability, small volume change at high temperature, not contraction due to leakage of hot metal.

Anhydrous stemming advantages:
1) High strength, and maintain the stability of blast furnace condition (iron mouth depth, the tapping time fluctuations, whole taphole wind rate, etc.) is of great importance, which makes the blast furnace has a production base.
2) Slag resistance is strong.Stemming consumption is low, the general water cannon is one 5 of the mud.
3) It has a certain expansion performance. Have appropriate porosity and strength, can adapt to more than 2000 m.The large blast furnace use.
Article Source: Function of taphole clay
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The clssification of corundum brick

According to the refractory raw materials, corundum brick can be divided into sintered, rebond sintered, fused and rebond fused corundum bricks.
The first is made from sintered corundum clinker, while the third is made from light burning corundum powder particles and fine corundum powder.
The second is fused corundum refractories, including fused cast corundum refractories. Fused cast corundum refractory or fused cast alumina refractory is made by casting molten glass into a mold and then cooling it into a solid. The refractory raw materials are always melted in an electric arc furnace.
Rebond fused corundum brick is made of fused corundum clinker and fine fused corundum powder or sintered corundum powder as the matrix. The key to its production is the processing of fused corundum materials. when fused gray or white corundum used as the main refractory raw materials, the frits should be smashed first and then seleted to remove silicon iron alloy. Silicon iron alloy may cause the burst of refractory products.
Article Source: refractory fire brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/