Which is the correct definition of the term leeching? from science!?

Answer 1

Leaching - Leaching is the process of extracting a substance from a solid by dissolving it in a liquid. In the chemical processing industry, leaching is known as extraction. Leaching has a variety of commercial applications, including separation of metal from ore using acid, and sugar from beets using hot water. Chloride can also be leached from food.

In agriculture, leaching may refer to the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. Soil structure, crop planning, type and application rates of fertilizers, and other factors are taken into account to avoid excessive nutrient loss. Leaching may also refer to the practice of applying a small amount of excess irrigation where the water has a high salt content to avoid salts from building up in the soil. Where this is practiced, drainage must also usually be employed, to carry away the excess water.

In a typical leaching operation, the solid mixture to be separated consists of particles, inert insoluble carrier A and solute B. The solvent, C, is added to the mixture to selectively dissolve B. The overflow from the stage is free of solids and consists of only solvent C and dissolved B. The underflow consists of slurry of liquid of similar composition in the liquid overflow and solid carrier A. In an ideal leaching equilibrium stage, all the solute is dissolved by the solvent; none of the carrier is dissolved. The mass ratio of the solid to liquid in the underflow is dependant on the type of equipment used and properties of the two phase.

Leaching is an environmental concern when it contributes to groundwater contamination. As water, from rain, flooding or other sources, seeps into the ground, it can dissolve chemicals and carry them into the underground water supply. Of particular concern are hazardous waste dumps and landfills, and, in agriculture, excess fertilizer and improperly stored animal manure.

New systems of abatement for leaching is pretty much the mandate to get an approval for operation in mining now days..

To set up a leach plant (at least in most nations) one must provide some type of impermiable shield to eliminate potential ground water contamination. I currently has stock in a mining operation in China and Turkey and the plan of operation includes setting up the impervious leaching systems and chemical treatment prior to mining one ounce of ore from the ground.

Answer 2

Leaching is the process of extracting a substance from a solid by dissolving it in a liquid. In the chemical processing industry, leaching is known as extraction. Leaching has a variety of commercial applications, including separation of metal from ore using acid, and sugar from beets using hot water. Chloride can also be leached from food.


for more imformation check out this link:
http://en.wikipedia.org/wiki/Leaching

Answer 3

Leaching Def

Answer 4

Genesis 1 In the beginning God created the heaven and the earth. 2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters. 3 And God said, Let there be light: and there was light.

Answer 5

leeching is when you add a liquid and it extracts heavy metals etc. from the ground, or the reverse. it's how lead got into the soil and into the lakes...

Answer 6

is that when they use leeches to suck blood out of a wound or after surgrey to look for clots..