[permalink] [id link]
Electrowinning is an electrolysis process used to recover metals in aqueous solution, usually as the result of an ore having undergone one or more hydrometallurgical processes.
from
Wikipedia
Some Related Sentences
Electrowinning and is
Electrorefining technology converting spent commercial nuclear fuel into metal. Electrowinning, also called electroextraction, is the electrodeposition of metals from their ores that have been put in solution or liquefied.
Rectiformers are commonly found in Electrowinning operations, where a direct current is required to convert base metal ions such as copper to a metal at the cathode.
Electrowinning and process
is and electrolysis
It is a silvery metallic element that must be extracted by electrolysis from a fused salt like calcium chloride.
If a chemical reaction is driven by an external applied voltage, as in electrolysis, or if a voltage is created by a chemical reaction as in a battery, it is an electrochemical reaction.
If the current is driven in the opposite direction by imposing an external potential, then work is done on the cell to drive electrolysis.
Usually, water is electrolysed as mentioned in electrolysis of water yielding gaseous oxygen in the anode and gaseous hydrogen in the cathode.
In other words, although the voltage applied is thermodynamically sufficient to drive electrolysis, the rate is so slow that to make the process proceed in a reasonable time frame, the voltage of the external source has to be increased ( hence, overvoltage ).
Faraday is also credited to have coined the terms electrolyte, electrolysis, among many others while he studied quantitative analysis of electrochemical reactions.
An important aspect of the second law of electrolysis is electroplating which together with the first law of electrolysis, has a significant number of applications in the industry, as when used to protect metals to avoid corrosion.
Industrial production is mainly from the steam reforming of natural gas, and less often from more energy-intensive hydrogen production methods like the electrolysis of water.
Oxygen is produced industrially by fractional distillation of liquefied air, use of zeolites with pressure-cycling to concentrate oxygen from air, electrolysis of water and other means.
Sodium is now produced commercially through the electrolysis of molten sodium chloride, based on a process patented in 1924.
The energy required to split water into hydrogen and oxygen by electrolysis or any other means is greater than the energy that can be collected when the hydrogen and oxygen recombine.
In chemistry and manufacturing, electrolysis is a method of using a direct electric current ( DC ) to drive an otherwise non-spontaneous chemical reaction.
The key process of electrolysis is the interchange of atoms and ions by the removal or addition of electrons from the external circuit.
About four percent of hydrogen gas produced worldwide is created by electrolysis, and normally used onsite.
is and process
An approach that has appealed to some choreographers is reminiscent of Charles Olson's statement of the process of projective verse: `` one perception must immediately and directly lead to a further perception ''.
The process stipulates that the choreographer sense the quality of the initial movement he has discovered and that he feel the rightness of the quality that is to follow it.
She, too, is concerned with `` the becoming, the process of realization '', but she does not think in terms of subtle variations of spatial or temporal patterns.
In its place is a passionate consciousness grasped and molded to feelings of positive or negative values even as the actions of one's life are determined by constellations of process in which one is caught.
But it is a clumsy and wasteful process: it can produce negative results but not much that is positive.
In the case of social decay, form is displaced simply by the process of dissolution with no form at the terminus of the process.
Within institutions there is a marked decline of the process of persuasion and the substitution of a force-fear process which masquerades as the earlier one of persuasion.
Britain in the nineteenth century is a textbook designed `` to give the sense of continuous growth, to show how economic led to social, and social to political change, how the political events reacted on the economic and social, and how new thoughts and new ideals accompanied or directed the whole complicated process ''.
But it is in the process of so doing because it apparently gives priority to trying to downgrade John F. Kennedy.
In still others which are barely on the threshold of the transition into modernity, the decade can bring significant progress in launching the slow process of developing their human resources and their basic services to the point where an expanded range of developmental activities is possible.
It is an answer in its way, individual and highly dramatic, to the charge that the democratic process is necessarily vicious in its campaign characteristics.
But this we know: Here is a great life that in every area of American politics gives the American people occasion for pride and that has invested the democratic process with the most decent qualities of honor, decency, and self-respect.
It is but part of the whole process within the Department that goes into the making of the final recommendation to the appeal board.
It was recognized years ago that the transition from daytime to nighttime propagation conditions, and vice versa, is not an instantaneous process, but takes place over periods of time from roughly 2 hours before sunset until about 2 hours after sunset, and again from roughly 2 hours before sunrise until some 2 hours after sunrise.
0.468 seconds.