Production Characteristics And Solutions Of Metallurgical Industry

       

From
ore to metal materials, the metallurgical industry goes through multiple
production links, such as mining, transportation, storage, crushing,
classification, separation, liquid-solid separation, pelletizing, sintering,
smelting, casting, refining and so on. The main equipment in each link is under
extremely bad working conditions such as high wear, high load, high temperature
and corrosion. These factors lead to the failure of production equipment,
making the metallurgical industry a major consumer of consumables and energy in
the national economy. Faced with this situation, in order to maintain
production, a large number of spare parts must be consumed every year, and some
still need to be imported. A large iron and steel enterprise has to pay more
than hundreds of millions of yuan every year. On the other hand, modern
metallurgical production is a highly continuous process. Even if the equipment
in each part of the production link fails prematurely, it will also cause
shutdown or reduction of production and bring huge economic losses.

Then
we can adopt the method of high temperature oxidation resistant coating. What
are the functions of high temperature oxidation resistant coatings? The high
temperature resistant coating is used to improve the high temperature
performance of the matrix (equipment or facilities) (the higher temperature can
reach 1150 ℃) so that it can withstand the high temperature chemical or
physical dissolution process and the erosion process of mechanical damage, or
both. What are the requirements for high temperature oxidation resistant
coatings? In order to avoid the damage caused by high temperature oxidation,
these coatings must: prevent the diffusion of oxygen in the atmosphere; Prevent
the rapid diffusion of the coating itself to the substrate; Having a melting
point higher than the operating temperature; Low vapor pressure at operating
temperature. The recommended spraying materials are nickel chromium alloy, nickel
chromium aluminum alloy, spray aluminum sealing and hot infiltration. The
recommended spraying methods include plasma spraying, high-speed flame spraying
and combustion flame spraying.

Application
examples include furnace walls of heating furnace, soaking furnace, heat
treatment furnace, sintering furnace, hot blast furnace, regenerative furnace
and regenerator, and the surface of metal grate; Annealing plate, annealing
hood, heat treatment fixture, outer surface of rotary kiln, high temperature
valve, sliding gate, flue and chimney, etc. Polysilicon furnace, sintered metal
forming, exhaust muffler, blast furnace tuyere, air supply system, sintering
equipment, blast system, air purification system, smoke exhaust system,
annealing furnace roll, Franklin furnace, hot metal impregnation heater,
titanium strip, forging tools, heating hood, coke oven sealing device, blast
cooling system, converter oxygen supply system, coke oven tuyere Continuous
casting roll and cooling sand mold, etc.

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