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  2. Spark testing - Wikipedia

    en.wikipedia.org/wiki/Spark_testing

    Spark testing of tool steel Spark testing of mild steel. Spark testing is a method of determining the general classification of ferrous materials. It normally entails taking a piece of metal, usually scrap, and applying it to a grinding wheel in order to observe the sparks emitted. [1]

  3. Iron (II) carbonate - Wikipedia

    en.wikipedia.org/wiki/Iron(II)_carbonate

    Iron(II) carbonate, or ferrous carbonate, is a chemical compound with formula FeCO 3, that occurs naturally as the mineral siderite. At ordinary ambient temperatures, it is a green-brown ionic solid consisting of iron(II) cations Fe 2+ and carbonate anions CO 2− 3. [5] The compound crystallizes in the same motif as calcium carbonate. In this ...

  4. Orsat gas analyser - Wikipedia

    en.wikipedia.org/wiki/Orsat_gas_analyser

    An Orsat gas analyser or Orsat apparatus is a piece of laboratory equipment used to analyse a gas sample (typically fossil fuel flue gas) for its oxygen, carbon monoxide and carbon dioxide content. Although largely replaced by instrumental techniques, the Orsat remains a reliable method of measurement and is relatively simple to use.

  5. Carbonatation - Wikipedia

    en.wikipedia.org/wiki/Carbonatation

    According to the Pourbaix diagram for iron, the metal is passive when the pH is above 9.5. [1] The carbon dioxide in the air reacts with the alkali in the cement and makes the pore water more acidic, thus lowering the pH. Carbon dioxide will start to carbonatate the cement in the concrete from the moment the object is made.

  6. Combustion analysis - Wikipedia

    en.wikipedia.org/wiki/Combustion_analysis

    Combustion analysis is a method used in both organic chemistry and analytical chemistry to determine the elemental composition (more precisely empirical formula) of a pure organic compound by combusting the sample under conditions where the resulting combustion products can be quantitatively analyzed.

  7. Iron compounds - Wikipedia

    en.wikipedia.org/wiki/Iron_compounds

    Crystal structure of iron(II) oxalate dihydrate, showing iron (gray), oxygen (red), carbon (black), and hydrogen (white) atoms. Blood-red positive thiocyanate test for iron(III) Iron(III) complexes are quite similar to those of chromium(III) with the exception of iron(III)'s preference for O-donor instead of N-donor ligands. The latter tend to ...

  8. Steelmaking - Wikipedia

    en.wikipedia.org/wiki/Steelmaking

    To reduce the carbon content in pig iron and obtain the desired carbon content of steel, it is re-melted and oxygen is blown through in basic oxygen steelmaking. In this step, the oxygen binds with the undesired carbon, carrying it away in the form of CO 2 gas, an additional emission source. After this step, the carbon content in the pig iron ...

  9. Smelting - Wikipedia

    en.wikipedia.org/wiki/Smelting

    The carbon source acts as a chemical reactant to remove oxygen from the ore, yielding the purified metal element as a product. The carbon source is oxidized in two stages. First, carbon (C) combusts with oxygen (O 2) in the air to produce carbon monoxide (CO). Second, the carbon monoxide reacts with the ore (e.g. Fe 2 O 3) and removes one of ...

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