[討論] leaching
1.Leaching is the process by which inorganic or organic contaminants are
released from the solid phase into the waterphase under the influence of
mineral dissolution, desorption, complexation processes as affected by pH,
redox, dissolved organic matter and (micro)biological activity.
2.Removal of materials by dissolving them away from solids is called leaching.
3.Process in which water removes and transports soil humus and inorganic
nutrients in solution.
4.method of extraction in which a solvent is passed through a mixture to remove
some desired substance from it. A simple example is the passage of boiling
water through ground coffee to dissolve and carry out the chemicals necessary
for producing the beverage. Another example is the removal of sugar from
sugar beets using water as the solvent. Leaching is also used to remove
metals from their ores. In one procedure certain crushed ores of copper are
placed into a series of tanks. As a solvent, such as sulfuric acid, is pumped
into the first tank, it dissolves the copper from the ore. Eventually
overflowing the first tank, the solution passes into the second, where more
copper is dissolved. When this tank overflows, the process is repeated in the
third tank and so on. The copper is ultimately removed from the solution by
chemical or other treatment.
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