Food - Recipes, Cooking, Nutrition cast irongriswold Sheryl Canter My previous post on the chemistry of cast iron seasoning focused on fat polymerization — the transformation of an oil into a hard, slick glaze. After I posted that, someone sent me some links that talked about two other elements in cast iron seasoning: A certain amount of carbon gets bound up in the polymerized fat when food is cooked in the pan. This may darken the pan, but does it make it more nonstick?
Again, in each case the iron oxide is reduced to iron by oxygen loss, but in terms of electrons the reduction is I'm afraid the chemistry of the blast furnace can get very complicated indeed! The role of limestone in the extraction of iron The original ore contains acidic mineral impurities such as silica SiO2, silicon dioxide.
These react with the calcium carbonate limestone to form a molten slag, the main ingredient being calcium silicate. There are two ways to show the formation of the waste slag, which is mainly calcium silicate. However, this is sometimes shown in two stages, i. However, whichever way you represent the reaction, its all the same in the end.
If you 'add up' chemical reactions ii and iii you get icheck for yourself. The molten slag forms a layer above the more dense molten iron and they can be both separately, and regularly, drained away.
The iron is cooled and cast into pig iron ingots OR transferred directly to a steel producing furnace. The waste gases and dust from the blast furnace must be appropriately treated to avoid polluting the environment. The highly toxic carbon monoxide can actually be burnt to provide a source of heat energy, and in the exothermic reaction it is converted into relatively harmless carbon dioxide.
Acidic gases like sulfur dioxide from sulfide ores, can be removed by bubbling through an alkali solution such as calcium hydroxide solution 'limewater' where it is neutralised and oxidised to harmless calcium sulphate.
Cleaning a gas in this way is called 'gas scrubbing'. Any contaminated water must be purged of harmful chemicals before being released into a river or recycled via water treatment plant. The waste slag is used for road construction or filling in quarries which can then be landscaped.
Iron from a blast furnace is ok for very hard cast iron objects BUT is too brittle for many applications due to too high a carbon content from the coke.
Most metals in everyday use are alloys. Iron is a good conductor of heat and can be bent or hammered into shape malleablequite strong physically — made stronger when alloyed with other materials.
This makes iron useful as structural material and for making things that must allow heat to pass through easily and useful construction materials.
Steel is an alloy because it is a mixture of a metal iron with other elements carbon and perhaps other metals too. In this state the cast iron is too hard and too brittle for most purposes. Cast iron is hard and can be used directly for some purposes eg manhole covers, ornamental railings because of its strength in compression and is very hard wearing.
However, if all the impurities are removed, the resulting very pure iron is too soft for any useful purpose. Therefore, strong useful steel is made by controlling the amount of carbon and selected metals to produce an alloy mixture with the right physical properties fit for a particular application e.
Objects made of iron or plain steel, particularly those exposed to the weather, regularly have to be painted or coated with some other protective layer from the effects of water and oxygen.
The properties of iron can be altered by adding small quantities of other metals or carbon to make steelone of the useful metal alloys in widespread use today. Steels are alloys since they are mixtures of iron with other metals or with non—metals like carbon or silicon.
The salts produced by this reaction form a slag which can be tapped off separately. Because of the high temperatures the mixture is stirred by bubbling in unreactive argon gas!
Economics of recycling scrap steel or ion: More on this below. This makes good economics because recycling saves on several costs AND allows a mineral resource like iron's haematite or magnetite ore resources to last a lot longer — slower depletion of the Earth's mineral ore resources will make it last longer.
There are particular problems due to the varying composition of alloys, but if the composition is known, or obtained from chemical analysis, the different compositions can be blended together to a desired alloy composition.Iron is an essential nutrient that, among other functions, is required for the production of healthy red blood cells (RBCs).It is a critical part of hemoglobin, the protein in RBCs that binds oxygen in the lungs and releases it as blood circulates to other parts of the body.
Iron helps transport oxygen from lungs to tissues and thus aid the release of energy from fuels to do the cell's work. When the iron supply is too low, iron-deficiency anemia occurs. Women are at greater risk of developing iron deficiency anemia due to.
Iron deficiency, or sideropaenia, is the state in which a body has not enough (or not qualitatively enough) iron to supply its eventual needs.
Iron is present in all cells in the human body and has several vital functions, such as carrying oxygen to the tissues from the lungs as a key component of the hemoglobin protein, acting as a transport medium for electrons within the cells in the form.
A sodium ion is formed when a Sodium atom loses a single electron. The ion is electrically charged, while the atom is electrically neutral. Sodium, an Alkali Metal from Group 1 of the periodic. (d) Suppose that the product (FeC_7H_5O_3]^+2 was not very soluble in water. Would this tend to make the reaction move more in the forward or backward direction?
Explain. Update 6/ using high-purity "spectrograph carbons" does not eliminate the magnetic grains produced by the arc. Dan Y. in Seattle found some pure carbon rods that analyze to a couple of ppm of silicon and manganese, but no iron.
Grinding up this carbon does not produce any grains which are attracted by a supermagnet.