Can the slag produced by adding alkali during the lead-alkali fire refining process be used in large quantities in blast furnaces?
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At the factory where I work, since it started operations last year, a large amount of slag has accumulated from the lead refining process and the alkali refining step used in producing alloyed lead. We now plan to dispose of this slag by feeding it into furnaces. The furnace is a blast furnace, and it is currently used primarily with materials such as lead grills, lead ash, and CRT lead glass. I want to increase the proportion of alkali slag a bit, but an experienced guy thinks it’s not a good idea, saying it will corrode the ramming material at the bottom of the furnace. What reactions occur to sodium stannate, sodium arsenate, and sodium antimonate in alkaline slag under a high-temperature reducing atmosphere? Shouldn’t the residual sodium hydroxide also react first with the CRT lead glass in the material in order to be reflected? Will the large amount of alkaline slag used cause corrosion at the bottom of the furnace? I would be grateful if experts could share their insights:D
There should be some corrosion, but it won’t be severe. After the alkali slag is melted, it isn’t the component with the highest density in the slag; it doesn’t flow out separately at the bottom of the furnace throat, but rather dissolves in the slag and is discharged together with it. Moreover, the erosion of the throat opening can also be repaired; can it be improved as long as there is a profit? But with a large amount of alkaline slag, there might be some problems when flushing it away, such as smoking or even explosions?