Further objections to the presence of silicon are that the resultant silica (1) corrodes the lining of the converter, (2) makes the slag froth so that it both throws much of the charge out and blocks up the nose of the converter, and (3) leads to rephosphorization.
Such a slag not only corrodes the furnace lining, but also impedes dephosphorization, because it is irretentive of phosphorus.
In the basic open-hearth process, on the other hand, silicon is harmful because the silica which results from its oxidation not only corrodes the lining of the furnace but interferes with the removal of the phosphorus, an essential part of the process.
The deep stream corrodes and cuts down the high ground; but meanwhile alluvial flats are gradually piled up in the shallows.
The denial of a fixed human nature also corrodes an ethics based on human pleasure or happiness, like hedonism and utilitarianism.