* economical: The bacterial leaching process is very slow compared to smelting.

In the process of water leaching, the bamboo is dried slowly and evenly in the shade to avoid cracking in the outer skin of the bamboo, thereby reducing opportunities for pest infestation.

This process is called leaching and increases pore space in the rock.

Adding baking soda to the water to raise its pH level will accelerate the process of leaching, as the more alkaline solution can draw out tannic acid from the wood faster than the pH-neutral water.

The mining involved the treatment of pyritic ore with a sodium cyanide solution to leach the gold out of the ore — heap leaching ( see also cyanide process ).

The most common hydrometallurgical process is leaching, which involves dissolution of the valuable metals into the aqueous solution.

In a process known as leaching, these acidic molecules pass through the soil layers with the help of rainfall, and release other nutrients trapped in clay such as nitrogen and phosphorus.

In contrast, the leaching process is only enhanced on higher elevation.

It begins with leaching by water ; the most easily lost and soluble carbon compounds are liberated in this process.

Although processing of any sulfide material ( in this case zinc ) usually emits large amounts of sulfur dioxide, the HBM & S plant uses a zinc pressure leaching process which greatly reduces emissions.

** Dump leaching, an industrial process to extract metals from ore taken directly from the mine and stacked on the leach pad without crushing

** Heap leaching, an industrial process to extract metals from ore which has been crushed into small chunks

** In-situ leaching, a process of recovering minerals such as copper and uranium through boreholes drilled into the deposit

Certain types of extraction process, like heap leaching for example, may result in quantities of chemicals used to perform the leaching remaining in the material once leaching has been completed.

During the process, the mixture of oxides reacts to form insoluble compounds, helping with leaching problems.

Acid leaching from mines and mechanical processing of ore speed up the process.

The mine used a chemical extraction process known as vat leaching involving the use of a weak cyanide solution.

The process, like heap leaching, makes it possible to process ore profitably that otherwise would not qualify as mill-grade.

This selective leaching process is known as hydrogen attack, or high temperature hydrogen attack and leads to decarburization of the steel and loss of strength and ductility.

In the leaching process, oxidation potential, temperature, and pH of the solution are important parameters, and are often manipulated to optimize dissolution of the desired metal component into the aqueous phase.

In other cases, particularly when the gold is present in the ore as fine particles or is not sufficiently liberated from the host rock, the concentrates are treated with cyanide salts, a process known as cyanidation leaching, followed by recovery from the leach solution.

This is much cleaner than the traditional heap leaching using cyanide.

It is also the most resistant against weathering ( alkali ions leaching out of the glass, while staining it ).

Some mining, including much of the rare earth elements and uranium mining, is done by less-common methods, such as in-situ leaching: this technique involves digging neither at the surface nor underground.

) Traditional cures use the natural microflora on the fruit to aid in fermentation, which leads to three important outcomes: the leaching out and breakdown of oleuropein and phenolic compounds ; the creation of lactic acid, which is a natural preservative ; and a complex of flavoursome fermentation products.

If using timber to raise the garden bed, ensure that it is an untreated hardwood to prevent the risk of chemicals leaching into the soil.

Water is central to the solution, precipitation and leaching of minerals from the soil profile.

pH is an important factor in the leaching activity of the hazardous waste.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from several local caves.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from several local caves.

A common method of producing potash alum is leaching of alumina from bauxite which is then reacted with potassium sulfate.

The leaching of highly water soluble tannins from decaying vegetation and leaves along a stream may produce what is known as a blackwater river.

This water in excess of plant needs is called the leaching fraction.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from Valley Cave.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from these caves.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from several local caves.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from the cave.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from caves.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from several local caves.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from several local caves.

Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from Grassy Cove Saltpeter Cave.

The leaching vats were located in a large room near the entrance, but this room is damp and the wooden vats have deteriorated to the point that they are difficult to recognize.