Sintering is a process in which the prepared sinter and auxiliary bottom materials are laid, distributed, ignited on the sintering machine, and the high temperature generated by carbon combustion and iron ore oxidation makes the sinter partially soften and melt, generates physical and chemical reactions, generates a certain amount of liquid phase, and then they are bonded to form massive sinter when they are cooled.
Sintering production is divided into raw material preparation and processing, iron material neutralization and mixing, batching, mixed granulation, distribution ignition sintering, cooling the whole grain, finished product output and other processes.
Raw material preparation includes imported powder for fire transportation, circulating material for automobile transportation, auxiliary material and fuel. The imported powder mainly includes Brazil powder, super special powder, South Africa powder, Pb powder, luoyishan powder and jinbuba powder. Internal circulation materials mainly include high return, steel sludge, dust removal ash, steel slag, etc., and auxiliary materials mainly include calcium stone powder, dolomite powder and lime. The fuel mainly includes coke powder, anthracite, etc.
The imported sinter powder and the inner circulating material are stacked in the material shed respectively. When sintering is used, the material is taken from the belt by the reclaimer and transported to the bin of a certain batching room. The material is cut according to a certain proportion and mixed into the blending bin of the secondary batching room.
The auxiliary materials for sintering are mainly take out ores. Through the lime kiln and stone powder crushing line, the lime powder, calcium stone powder and dolomite powder are processed by ourselves for sintering.
Granulation is to roll the mixture in the granulator into balls of all sizes, so as to ensure certain air permeability and exhaust sintering.
The sintering machine is to distribute the sinter materials to the trolley through shuttle distributor, mud roller blanking and nine roller distributor, and use the igniter to ignite the material surface. During the operation of the sintering machine, all the sinter materials on the trolley are gradually sintered into sinter through the suction.
Blast furnace ironmaking is a continuous production process of reducing iron ore to pig iron. Iron ore, coke, flux and other solid raw materials are batched by the top charging device according to the regulations and fed into the blast furnace in batches, and uniformly distributed into the blast furnace through the charging system.
Coke and ore form alternate layered structure in the furnace. The ore material is gradually reduced in the falling process, melted into iron and slag, gathered in the hearth, and regularly discharged from the iron port and slag port.
After heated to 800-1350 ℃, the cold air from the blower enters the hearth continuously and stably through the tuyere. The hot air burns the coke in front of the tuyere and produces reducing gas. The rising high temperature gas stream heats the iron ore and flux into a liquid state. Let iron ore complete a series of physical and chemical changes, gas flow is gradually cooled.
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