Blast Furnace Iron Production Process

     Blast furnace production is continuous. A generation of blast furnaces (from the start of the furnace to the overhaul of the generation) can be continuously produced for several years to ten years. At the time of production, from the top of the furnace (generally the top of the furnace consists of the material and the hopper, the modern blast furnace is the bell valve top and the bell-free top) is continuously loaded with iron ore, coke and flux, which is blown from the vent of the lower part of the blast furnace. Into the hot air (1000 ~ 1300 ° C), sprayed with fuel such as oil, coal or natural gas. The iron ore loaded into the blast furnace is mainly a compound of iron and oxygen. At high temperatures, the carbon monoxide produced by the combustion of carbon and carbon in the coke and in the blown extracts the oxygen in the iron ore to obtain iron. This process is called reduction. The iron ore is refined by the reduction reaction, and the molten iron is released from the tap. The gangue, coke, and ash in the iron ore are combined with a flux such as limestone added to the furnace to form slag, which is discharged from the tap hole and the slag outlet. The gas is led out from the top of the furnace and used as industrial gas after dust removal. Modern blast furnaces can also use the high pressure of the furnace roof to generate electricity from the exported gas.

Characteristics of blast furnace ironmaking: large scale, whether in other countries of the world or China, the volume of blast furnace is expanding. For example, China Baosteel blast furnace is 4063m3, producing more than ton of iron per day, more than 4,000 tons of slag, and more than 4,000 tons of daily consumption.

Ferroalloy Production Process Equipment

Intermediate frequency furnace:

     The intermediate frequency furnace is mainly composed of a ruthenium made of refractory material in the power source, the induction coil and the induction coil. The crucible contains metal charge, which is equivalent to the secondary winding of the transformer. When the induction coil is connected to the AC power source, an alternating magnetic field is generated in the induction coil, and the magnetic flux cuts the metal charge in the crucible, and an induced electromotive force is generated in the furnace. Since the charge itself forms a closed loop, the secondary winding is characterized by only one turn and is closed. Therefore, an induced current is simultaneously generated in the charge, and when the induced current passes through the charge, the charge is heated to cause it to melt.
     The intermediate frequency electric furnace uses the intermediate frequency power source to establish an intermediate frequency magnetic field, so that the induced eddy current inside the ferromagnetic material generates heat and reaches the purpose of heating the material. The medium frequency electric furnace adopts 200-2500Hz intermediate frequency power supply for induction heating, smelting and heat preservation. The medium frequency electric furnace is mainly used for melting carbon steel, alloy steel, special steel, and can also be used for melting and warming of non-ferrous metals such as copper and aluminum. The equipment is small in size and weight. Light, high efficiency, low power consumption, fast melting and heating, easy control of furnace temperature and high production efficiency.

Medium frequency melting furnace features:

     1. Fast smelting speed, good power saving effect, less burning loss and low energy consumption.
     2. Self-mixing function, melting temperature and uniform metal composition.
     3. The electric heating environment is good.
     4. The starting performance is good, and the empty furnace and full furnace can reach 100% startup.