Melt type refining synthetic slag heat insulation Refractory Materials Iron and steel smelting
Functions and characteristics:
The main function of the melt type refining synthetic sla is to make use of the high basicity and strong reducing atmosphere to deeply remove [O], [S], assimilate and adsorb the remaining inclusions such as Al2O3 in molten steel, so as to achieve the purpose of static molten steel and reduce the content of harmful components.
Using synthetic slag melting type refining refined, easy to make molten steel composition uniform stability and response speed, good effect, has been widely used in iron and steel production, especially under the condition of reducing desulfurization slag, such as vacuum refining) combined with powder injection, such as blowing argon stirring combination, multi-function refining technology is more and more attention, and has been widely used in iron and steel production,Achieved unprecedented results.
The physical and chemical indicators
Conditions of use:
(1) Strictly block slag and ensure appropriate slag discharge (try to ensure slag discharge <50mm, FeO+MnO<1% in slag)
(2) If the FeO+MnO in the original slag is too high or the slag amount is too large, the steel slag modifier should be added for modification treatment first. When the requirements are met, the fused refining synthetic slag should be added for refining treatment.
Mechanism of action:
There are three kinds of conventional slag systems: CaO -- SiO2-Al2O3 -- CaF2, CaO -- CaF2, CaO -- SiO2-CaF2. They have their own characteristics and can be effectively selected according to their different purposes.
CaO -- SiO2-Al2O3-CaF2 system has the removal of [S] and strong adsorption inclusion effect, CaO -- CaF2 slag system has the strongest removal of [S] ability, CaO -- SiO2-CaF2 slag system is similar to CaO -- CaF2 slag system but the removal of [S] effect is not as good as it.
Adding method and amount
In general, the amount of molten refining synthetic slag is closely related to the process conditions of the steel plant, so the addition method of each steel plant has its own characteristics.Joining too early or too late can not get a good effect, so it is necessary to summarize according to their own characteristics and come up with a suitable way to join.
In general, the amount of addition depends on the requirements of the steel mill, which is generally added by 3-7kg /t steel.