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Q. Explain about Gravity Separation?
This is one of the simplest processes of concentration of ores. It is based on the difference in the specific gravities of the gangue and ore. In this process, the crushed ore is kept on top of a sloping table, which is prepared to vibrate. A stream of water is goes in the direction perpendicular to the slope. The lighter particles are thrown up by vibration and are replaced by the water stream. The heavier mineral particles settle to the base and are collected. This process of gravity separation is called as tabling. Casseterite or tin-stone, pitchblende and chromite are concentrated by this method.
A modification of the above process is sinking and float method. In this the powdered ore is suspended in a liquid whose specific gravity is intermediate between the ore and the densities of gangue. The lighter material floats and the heavier material sinks. In this process, the difficulty is in finding a liquid of the proper specific gravity. A solution of calcium chloride in after is usually used. Suspensions of sand in water giving liquids of specific gravities up to 3.2 are also used. Thus, due to technical problems this process is rarely used in concentration of low grade ores, but it is widely used in cleaning coal.
preparation of arylaldehyde from etards reaction
Question: (i) List the different members of the marine mammalian groups. (ii) Explain the term "stranding" and give some reasons why cetaceans strand? (iii) Cetacean
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Uses of Benzoic Acid - carboxylic acids (i) Benzoic acid is used in medicine in the form of its salts particularly as urinary antiseptic. (ii) Benzoic acid is used as sodium
Q. Show the rate of decrease in atomic radius? The rate of decrease in atomic radius along the lanthanide series and also along the actinide series is even less than that in th
In industries 653k is very low temperature so co is the best reducing agent.
Q. Explain heat according to kinetic theory of matter? Ans. On an atomic level the definitions of heat and temperature becomes more precise. According to the kinetic theory of
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the decomposition of nh3 on a platinum surface is a zero order reaction. what are the rates of production of n2 and h2 if k+2.5*10-4 mol-1 lsec-1?
A mixture is prepared by adding 25.0 mL of 0.185 M Na3PO4 to 34.0 mL of 0.140 M Ca(NO3)2. (a) What mass, in grams, of calcium phosphate will be formed? What will be the concentrati
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