thanks cub3bead for noting the reaction. This confirms an opinion from an engineer who told me the reaction proceeds but did not remember the equilibrium concentration of the sodium hydroxide other than that is was not very high.
we have great quantities of natural sodium sulfate in a surface...
Slag from a furnace melting cast iron can contain harmful elemments from the melted scrap. Depending on alot of factors, these may leach into the soil.
Most smaller foundries cast either aluminum, brass, or both. Protective flux is used in melting these and the flux is a low melting point...
