Ac·id proc·ess. Iron Metal. That variety of either the Bessemer or the open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process.
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Ba·sic proc·ess. Iron Metal. A Bessemer or open-hearth steel-making process in which a lining that is basic, or not siliceous, is used, and additions of basic material are made to the molten charge during treatment. Opposed to {acid process}, above. Called also Thomas process.
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