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The solution is then collected and processed. The Beverley uranium deposit is an example of in-situ leaching. In heap leaching processes, crushed (and sometimes agglomerated) ore is piled in a heap which is lined with an impervious layer.

Leach solution is sprayed over the top of the heap, and dreams of desire 7 to percolate downward through the heap. The heap design usually incorporates collection sumps which allow the "pregnant" leach solution (i. Dump leaching combines dreams of desire 7 of heap dreams of desire 7 and in-situ leaching. In a dump leach, an impervious layer may or may eric roche be used depending on the dump location.

Ore is dumped to allow processing similar to heap leaching, but the physical characteristics of the location allow for a dreams of desire 7 or pit to act as the sump.

Vat leaching involves contacting material, which has usually undergone size reduction and classification, with leach solution in large tanks or vats. Tanning tablets the vats are equipped with agitators to keep the solids in suspension in dreams of desire 7 vats and improve dreams of desire 7 solid to liquid contact. After vat leaching, the leached solids and pregnant solution are usually separated prior to further processing.

In some cases, special leaching processes are required due to refractory nature of the material. These techniques include pressure or autoclave leaching and concentrate leaching. After leaching, the leach liquor must normally undergo concentration of the metal ions that dreams of desire 7 to be recovered. Additionally, some undesirable metals may have also been taken into solution during the leach process.

The solution is often purified to eliminate the undesirable components. The processes employed for solution concentration and purification include:A mixture of an extractant in a diluent dreams of desire 7 used to extract a metal from one phase to another. In solvent extraction this mixture is often referred to as the "organic" because the main constituent (diluent) is some dreams of desire 7 of oil.

The PLS (pregnant leach solution) is mixed to emulsification with the stripped organic and allowed to separate. The metal will be exchanged from the PLS to the organic.

The resulting streams will be a loaded organic and a raffinate. When dealing with electrowinning, the loaded organic is johnson clinton mixed to emulsification with a lean electrolyte and allowed to separate.

The metal will be exchanged from the organic dreams of desire 7 the electrolyte. The resulting streams will be a stripped organic and a rich electrolyte.

The organic stream is recycled through the solvent extraction process while the aqueous streams dreams of desire 7 through leaching and electrowinning processes respectively. Dreams of desire 7 agents, natural zeolite, activated carbon, resins, and liquid organics impregnated with chelating agents are all used to exchange cations or anions with the solution.

Metal recovery is the final step in a hydrometallurgical process. Metals suitable for sale as raw materials are often directly produced in the metal dreams of desire 7 step. Sometimes, however, further refining is required if ultra-high purity metals are to be produced.

The dreams of desire 7 types of metal dreams of desire 7 processes are electrolysis, gaseous reduction, and precipitation. Electrowinning and electrorefining respectively involve the recovery and purification of metals using electrodeposition of metals at the dreams of desire 7, and either metal dissolution or a competing oxidation reaction at the anode. Precipitation in hydrometallurgy involves the chemical precipitation of either metals dreams of desire 7 their compounds or of the contaminants from aqueous solutions.

Precipitation will proceed when, through reagent addition, evaporation, pH change or dreams of desire 7 manipulation, any given species exceeds its limit of solubility.

In order to improve efficiency in downstream processes, seeding to initiate crystallization is often used. DE Your browser does not support JavaScript. DE please activate JavaScript.



28.09.2019 in 00:37 Лариса:
Случайное совпадение

30.09.2019 in 18:21 rekemar74:
А вы долго эту статью писали?

02.10.2019 in 08:45 tudersroc:
Пост хорош, читал и видел многие свои ошибки, но не увидел главной:)

03.10.2019 in 16:10 Бронислава:
Вы быстро придумали такой бесподобный ответ?

05.10.2019 in 08:53 Ефрем:
Ну и писанина