I would. Non-ferrous Extractive Metallurgy. Department of Metallurgical and Materials Engineering. Extraction of Zinc-Imperial Smelting Process. Nickel as a metal which comes from oxides sources. Extraction of nonferrous metals by H. Extraction metallurgy by Joseph. Download Syllabus in PDF format.
Extraction of nonferrous metals, H. Ray: ebook kindle pdf goodbye to berlin by christopher isherwood bestseller industrial and scientific aspects of non-ferrous metals production.
Ray, R. Shridhar edexcel a2 chemistry revision guide pdf and K. Abraham, Extraction of non famous metals. Like ferrous extraction, non-ferrous extraction primarily focuses on the economic. Extractive metallurgy of ferrous and non-ferrous metals can involve. World resources of Non-ferrous metals and their occurrence. Abraham, - Affiliated East-West Press. Refining processes with examples for metals like Aluminium, Copper, Zinc, Lead.
Fundamentals Ray, H. Dragging him out of his isolation and throwing him. Nonferrous metal production holds a special role earn dollars a month guide pdf in the propelling global economy vis- -vis answering to. Mine reserves, metal extraction, metal purification and productivity enhancement along with long. Among non-ferrous metals copper, nickel and cobalt, due to.
Extraction ofNon-ferrous Metals, H. Sridhar, K. P, Ltd. Mechanical Working of Metals. Principles of production of Ferrous and Non ferrous metals overview of alloy making and units. Russian Journal of Non-Ferrous Metals. All steps in extraction of primary nonferrous metals can be highly polluting because of emission of air.
Ray 1. Ray: industrial and scientific aspects of non-ferrous metals production. Sridhar, Abraham K. I have thought hundreds of students in those institutions and elsewhere. I specially, have always vibed very well with the undergraduate students and I have found that, basically every class, was so very similar.
There were always some students, who were very sincere; they take down notes. Copious notes, if I utter one sentence, they write down three sentences. There are some students, who are never looking at me. They are looking at the walls or through the windows, but somehow, I can sense that they were listening.
When I asked them, some questions later and they could respond very positively. On the other hand, there have always been some students, who would be looking at me but they would be blank faces. It means they may be hearing at the most, but they would not listen and obviously, there would be some students, who would be rather elsewhere.
Now, as a teacher, most of us who have been teachers, would like to connect with those people; a few people who are listening, and through them we connect with the class.
So, I assume that somebody there, with whom I am making a connection, and who will enjoy or at least try to enjoy, whatever he is learning. Right at the beginning, let me say one thing very clearly that, if you try to enjoy or try to learn, then you would like the course. If you like the course, you will try to learn. So, it is a process that goes on. If right from the beginning, if you take an attitude you know that this is a course, I would rather not interested in, and then you would find, it is not a course that is interesting you.
Now, I must admit that this course does not have a very good reputation, in the sense that many think non-ferrous metallurgy, is a very boring subject. They are not very wrong, because the way it was taught at one time, was very wrong. People would take one metal at a time; talk about ores and minerals; talk about methods of extraction, their uses, and then move on to another metal and this makes it very descriptive, and I do not think any student would be interested in this.
If it is information to be given, a student may very well say that when the information is in the book, why we have to come to the class. If necessary, I will read the book and pick it up.
As a teacher, I would not like to give the information because it is in the book; somewhere, some place you can find it. I would rather try to give you the principles that govern the extraction process of non-ferrous metallurgy; some logic in the subject. If you get the logic, then the subject is fun. If you do not get the logic, then it will be a descriptive course.
And remember that this course, in the undergraduate years, has to compete with some fantastic other courses where there is so much of quantification, beautiful concepts; that is mathematics in thermodynamics, in kinetics, in microstructures, crystallography, metal forming, the principles of dislocation; beautiful concepts and there were also wonderful laboratories, which substantiate with what you learn in the class.
In order to compete with that, non-ferrous metallurgy has to come up with logic of its own. I had to tell the students, why he should also take non-ferrous metallurgy seriously or try to do that. I do not know now how much I will succeed, but definitely, I will try to give you the logic of the processes, rather than the details of the processes.
I will try to avoid the details. When you would need them, you can always find the term but understand why certain things, are done in a certain way, and not in another way.
Now, when I joined IIT Kanpur, which is way back in , the first assignment, given to me, was teaching of non-ferrous extractive metallurgy to undergraduate students. I know they were very bright people and the thing was taught, in the fourth year. Since, I did not know the subject, I then asked to some of my colleagues that why you are not teaching it, because obviously they are more knowledgeable, and are more senior.
I understood that nobody wanted to teach the course, because they all thought it was a very boring subject, they were not very many good books either. I went to the library and I saw some books; they read like encyclopedias. A famous book, which was followed at that time as a textbook, was by Bray. That book started with aluminum, the logic here is aluminum starts with A, and it ended with zinc, because it starts with Z.
Had aluminum been called as zaluminum, it would have gone to the end, and had zinc been called something with A, it would have been discussed first then. This, I thought was ridiculous, and I thought the book gave information, but it is not a book, which can be used for teaching. So, I started writing a book and finally, with two other colleagues of mine, I wrote this book.
Ray, R Sridhar and K. P Abraham. I would follow this book to a large extent. It has not been revised, in the last 25 years and it is going to the thirteenth print. So, many of the data given are old, but the principles are not old. The principles remain the same, but I would certainly update, as I go on.
As I said, we have tried to give logic for this course in this book and to that, I will come little later. The logic is simply is this; I would try to put all this metals in some groups. There will be four or five groups. They will be discussed in terms of their occurrence in nature.
Because if they occur in nature in one form, then the processes for their extraction, would be governed by one logic, than if, they were present in another form. Refer Slide Time: Now, let me give you, write, discuss two equations. To tell you how… that when you write an equation in non-ferrous metallurgy, we are not doing what we do in chemistry.
Had this been, a course in chemistry, I would have said that sodium can be titanium can be produced by reduction of titanium tetrachloride by magnesium or reduction of titanium tetrachloride by sodium and period, and then I proceed to something else.
But, actually here, once I write these equations, I start thinking of something quite different from what a chemist, will do. Why should this difference be there? There is a very interesting reason. I am not going to discuss everything now but I will hint at it. It is what you call as a termolecular equation in a condensed phase. One molecular titanium chloride, finds two atoms of magnesium, and forms a titanium atom and magnesium chloride in bulk.
There are atoms of titanium being produced, one after another. There is no reason, why they should be consolidated, they remain separated and they produce a spongy mass. Because, if you look at it, what the reaction says is, that you have a gas phase and if one molecule of titanium tetrachloride, which is moving around, finds four atoms of sodium at one place, then a reaction takes place. What is the probability that four atoms of sodium, one molecule of titanium tetrachloride to come to one point.
Probability, I think is not existing. This reaction cannot take place like this, because a penta molecular reaction, in a gas phase, is not what you expect to occur. Then what would be the other way of doing things. Refer Slide Time: I propose that it does not occur like that. Actually, there are simpler reactions that take place. Like sodium reacts with one molecule of titanium tetrachloride, produces a sub halide such as titanium trichloride, which then dissolves in sodium chloride.
Then sodium reacts with titanium trichloride, which is in the liquid state, produces another sub halide titanium dichloride and sodium chloride. May be some sodium also dissolves to some extent in the liquid state, and reactions take place there. Now, can I give a proof that these things happen? People have found and yes! These phases have been found, in sodium chloride phase; they are transient phases, which mean they come and go.
So, the summoned substance is that the reaction of reduction of titanium tetrachloride, by sodium is not taking place in the vapor phase. It is actually taking place in the sodium chloride phase.
So, there is formation of sub-halides. When we write the penta molecular reaction, it is an overall reaction, period; that, does not give the mechanism of the reaction. Once you understand the mechanism, which is the reaction occurring in the liquid phase, then something more interesting phases of the reaction, are coming out. We will show that later.
So, you see that just writing a reaction is not enough in process metallurgy; we have to understand the mechanism behind it. Let me proceed to another reaction. Refer Slide Time: Many oxides, which we have written as MxOy, can be reduced by aluminum, because aluminum forms a more stable oxide Al2O3, and it releases the metal.
For example, if you can take Fe2O3 and mix with the aluminum powder, all that one has to do is simply to ignite it, and there are many methods of igniting. Just a small part of it should become, heated to degrees or so; then the reaction that proceeds is highly exothermic and then it becomes autogenous, means you do not have to supply any more heat. It would continue, not only continue, but also, also actually sometimes become explosive, because so much of heat is generated.
We then might have to control the reaction, by keeping their excess of metal M, so that it can absorb some heat and control the reaction.
A thermic mixture is made by mixing aluminum powder and iron oxide. Sometimes it can be pure iron ore. This can be used to weld cracks in railway tracks, in rails. If you find there is a crack, then you make a mould around it, put this mixture and simply ignite it. Reaction takes place, molten iron produced, fills the gap, and the rail is welded. On the spot, you can do this; you do not have to bring a furnace or anything. You just need a device to ignite and there are many ways of putting initial heat.
Now this is not the only reaction. Aluminum, as well as calcium, both of them form stable oxides and can reduce many metal oxides. Now, we might be tempted to think, that these reactions are very favorable, from energy point of view because once started, you do not have to supply any more heat and it goes on producing heat.
But the fact is this is a wrong way of looking at things. We are being very shortsighted. The question to be answered is, to make it energy favorable from the point of view of energy; we also have to ask that question how much energy is required to produce aluminum, which is a reducing agent. It may so happen that aluminum needs a lot of energy to be produced. So, if you take that energy into count, then it is not a very good process, from the energy point of view.
We take into account all the energy that goes into production of the raw materials - input side. Then we take into account, the exothermic heat that is coming out. We also take into account, the sensible heat of the products. May be there are gases that would come out, and from where we may be able to extract some sensible heat.
This process is not favorable from point of view of energy. So, this is the way we will analyze things. It also covers the scientific and engineering aspects of nuclear. The world's output of metals during the year period of was greater than in all the previous years of man's history.
In the nineteenth century the only metals available to industry were cast and wrought iron and a few non-ferrous metals and their alloys; by the latter part.
Chemistry, Society and Environment. This is the first book to look critically at the whole development of industrial chemistry in the UK in the context of its effects on the environment.
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