http://encarta.msn.com/encyclopedia_761559225/iron_and_steel_manufacture.html Provides the answer. basic summary: 1. Pig Iron and Sponge Iron are the result of different production processes 2. Which results in different purities. Pig Iron has a lower purity than Sponge Iron.
Sponge iron is produced by reducing iron ore pellets in a direct-reduction process, whereas pig iron is produced by melting iron ore with a high-carbon fuel in a blast furnace. Sponge iron is mainly used as a raw material for steelmaking in electric arc furnaces, whereas pig iron is typically used in the production of cast iron and wrought iron products.
http://encarta.msn.com/encyclopedia_761559225/iron_and_steel_manufacture.html Provides the answer. basic summary: 1. Pig Iron and Sponge Iron are the result of different production processes 2. Which results in different purities. Pig Iron has a lower purity than Sponge Iron.
Pig iron is the initial form of iron produced during the smelting of iron ore, containing high carbon content and impurities. Steel is an alloy of iron that contains less carbon and is produced by further refining pig iron to remove impurities and control the carbon content, resulting in a more malleable and versatile material.
a boar is a male pig and a pig is just a female :)
pig is a pig and the wild boar is a wild boar
uhmmm..... penises?
no
Pig iron is generally an intermediate product of the wrought iron and steel making process. Pig iron is virtually useless due to the very high impurity content. "Pure" is a strange quantification of the comparison between pig iron and wrought iron. Pig iron is pure pig iron and wrought iron is pure wrought iron if there is a "standard" for the respective materials. I'm guessing that the answer you want is that wrought iron is "more pure."
Pig iron is cast iron with a very high carbon content: 4% by weight or more. Cast iron has at least 2% carbon by weight. Less than that, and it's steel. Cast iron and pig iron are not called steel, despite being iron carbides, because they lack the structural strength of steel and are extremely brittle. In terms of the microstructure, cast iron and pig iron contain no cementite, austenite, or martensite. Historically, "pig iron" refers to cast iron made by a particular process: the high-carbon molten iron made in a blast furnace was poured into moulds made of sand, which had a particular shape. Narrow trenches would run down the edge of the mould, and then branching off of them there would be the actual ingots. The whole setup looked to the ironworkers like a sow suckling piglets, so the product became known as pig iron.
cause it just is different!(:
that pig spelling is P-I-G and pia doesn't have a G in it.
direct reduction: FeO + C = Fe + CO indirect reduction FeO + CO = Fe + CO2 I don't think that is what the terminology 'direct reduction' means in this context. For a start most directly reduced iron (DRI) is produced using CO and H2 produced from natural gas. I think the correct meaning is that 'direct reduction' is called direct because it directly produces iron (as a solid sponge because iron has a high melting point - see the 'bloomery process' for producing wrought iron), while the indirect process produces iron via 'pig iron' which is a high carbon alloy of iron (produced as a liquid because of the reduction in melting point caused by the carbon - see 'Osmond' process).