Why your furnace NEEDS flux

追加: 2026-05-26

[00:00:00]So, imagine running your furnace with no flux stone.

[00:00:04]Just coke ash and pellet gang. Here what happens, coke at 400 kilo per ton of hot metal gives you a 40 kilo of ash, 85% of that becomes slag, about 35 kilo made of 60% [laughter] silica and 40% alumina. So, that slag melt over 1590°, very high temperature. Then pellet add another 85 kilo of gang, so 90% silica, combine them without flux and you will get 120 kilo of slag. That's up to 85% silica.

[00:00:36]Extremely high melting point, thick as glass, terrible sulfur removal. So, that's unusable. So, you add flux stone, 130 kilo of limestone and dolomite per ton of hot metal.

[00:00:49]That blend gives you lime and magnesia.

[00:00:52]So, now your slag volume hits the target of 250 kilos, melting point drop to 1350 to 1450°, viscosity fall to 2 to 5 poise, and sulfur capacity jumps.

[00:01:04]Remember, no flux equals slag that would not flow. So, flux unlock the furnace.

[00:01:10]Good flux, good slag, good furnace, and good