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Introduction of refining slag
Source: | Author:Changxing | Publish time: 354 days ago | 201 Views | Share:
Introduction of refining slag

Synthetic slag refining desulphurization technology is one of the key technologies of producing clean steel of ultra low sulfur. According to the research and testing reports, we get varieties of chemical composition ratio of refining slags as below:

Chemical composition

Ratio

CaO-SiO2-Al2O3-MgO-CaF2-Na2O

56.1 : 15.5 : 15.4 : 8.8 : 2 : 2.2 

CaO-SiO2-Al2O3-MgO-CaF2

 

53 : 17 : 10 : 10 : 10 

59 : 15 : 8.5 : 10 : 7.5 

54.2 : 12.3 : 22 : 87 : 28 

50.41 : 0.59 : 30 : 10 : 

CaO-SiO2-Al2O3-MgO

53 : 4 : 35 : 

CaO-SiO2-Al2O3-CaF2

32.5 : 5 : 57.5 : 

CaO-MgO-Al2O3-SiO2

50 : 15 : 20 : 15 

CaO-SiO2-Al2O3

65 : 10 : 25 

It is the same that most basic slag use low-melting-point position ternary slag system of CaO-SiO2-Al2O3. The most important role of basic slag is to control slag basicity, which has a great influence on the desulfurization effect during refining process.

The difference of above refining slags is for fine adjustment of basic slag. According to the using effect of different chemical composition, choose different kinds and content additives, to get the expected result. The effects of different chemical compositions in refining slag are as below:

Composition

Effect

CaF2

Reduce slag melting point and Improve its liquidity

CaO

Adjusting slag basicity and as desulfurizer

SiO2

Adjust slag basicity and viscosity

Al2O3

Adjust CaO-SiO2-Al2O3ternary slag system to low melting point position

CaCO3

As desulfurizer and foaming agent

MgCO3(MgO)

As foaming agent,decomposition to produce magnesium oxide, which will protect ladle lining

BaCO3(BaO)

As foaming agent, desulfurizer and inhibition of liquid steel to phosphorus

Na2CO3(Na2O)

As foaming agent, desulfurizer and fluxing agent

K2CO3(K2O)

As foaming agent, desulfurizer and fluxing agent

Li2CO3(Li2O)

As foaming agent, desulfurizer and fluxing agent

Al

Strong desoxidant, also priority react with CaO for desulfuration, improving desulfurization result.

Si-Fe

As desoxidant,purifying molten steel