Definitions

WHITE CAST IRON

WHITE CAST IRON Rapid cooling of molten pig iron produces white cast iron. The white appearance is due to the presence of iron carbide.

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CAST IRON

CAST IRON When pig iron is melted, run into moulds and cooled, it changes to cast iron. It contains about 2 to 4% carbon. There are two forms of cast iron:

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PIG IRON

 PIG IRON It is the impure form of iron and contains about 3 to 4 % carbon.. ft also contains other impurities such as Si, P,Mn and sulphur. It is brittle and usually used to get other forms of iron.

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Hydrometallurgy

 Hydrometallurgy This branch of metallurgy, deals with the extraction of metals by dissolving or leaching out the metal or its compounds from the ore with the help of a selective solvent. The solution is separated from the undissolved material and the metal is recovered from the leach liquor by electrolysis or by precipitation with a suitable metal.

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What is Metallurgy & Metallurgical Operation

What is Metallurgy & Metallurgical Operation The metals, which are found in metallic or free state, are said to be native. The art or science of extracting metals or alloys from their ores is called metallurgy. The physical operations and the chemical process used in the extraction of metals are called metallurgical operations. The steps involved in metallurgical operations are: ...

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Define Minerals, Ores & Gangue

Define Minerals, Ores & Gangue Few metals, such as gold and platinum and sometimes copper. silver, mercury etc. which occur free in nature in their elemental form most of the metals such as iron, copper, aluminum, calcium, sodium etc. are found in nature in combined form. The naturally occurring elements and metallic compounds are called minerals. The minerals from which metals ...

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OHM’S LAW

OHM’S LAW According to Ohm’s Law, the strength of an electric current flowing through a conductor i.e. the quantity of electricity flowing per second ‘I’ is directly proportional to potential difference ‘E’ applied across the conductor and is inversely proportional to the resistance `R’ offered by the conductor to the current                   ...

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Electrochemistry

Electrochemistry Electrochemistry is concerned with the chemical transformations produced by the passage of electricity and with the production of electricity by means of chemical transformations. The fact that electricity can be produced by means of chemical reactions allows the storage of electrical energy in the form of chemical reagents which may be used to produce electrical energy at a more ...

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Electro-osmosis

Electro-osmosis The movement of the dispersion medium through a porous material under the influence of an applied electric field is called Electro-osmosis. The sol particles are kept stationary by some suitable means. Electro-osmosis is the inverse of electrophoresis. In electrophoresis, the sol particles move and the dispersion medium remains stationary. Whereas in electro-osmosis the dispersion medium moves and the sot ...

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ELECTROPHORESIS OR CATAPHORESIS

ELECTROPHORESIS OR CATAPHORESIS The movement of electrically charged sol particles under the influence of an applied electric field is called electrophoresis. The velocity of the colloidal particles under a fall of potential one volt per cm is known as the electrophoretic mobility. It has been found that the range of 2 to 4×10-4 cm per sec. Electrophoresis consists of a U-tube fitted with ...

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