How to determine molybdenum or not?

Hello, dear!
A friend’s father died and left behind pieces of metal. The metal is silver in color, quite hard, can be taken with a file, but not easily, much more difficult than steel3, in nitrogen, hodgepodge and sulfur – zero reaction, at least at room temperature. It is assumed that it is not an alloy. How can you determine what kind of metal it is?
Thanks for the tips. PS
Sentence:
Guilty of lameness! eukar Message eukar » Fri Apr 20, 2007 2:11 pm IMHO it’s easiest in terms of density.
Georgy Messages: 282 Registered: Wed Mar 02, 2005 8:52 pm Message Georgy » Fri Apr 20, 2007 2:33 pm that is, perhaps by immersion? Now I’m just looking for it in Yandex, I don’t even have my school knowledge left, can you tell me how to calculate it? formula, but what I downloaded is very difficult for me:
www.ssu.samara.ru/~ett/laby files/labrab3m.pdf
I just get dumb when I look at physical formulas! some kind of mental allergy caused by the virus of stupidity with which I am infected Last edited by Georgy Fri Apr 20, 2007 2:36 pm, edited 1 time in total.
eukar Message eukar » Fri Apr 20, 2007 2:36 pm pure density = pure mass divided by pure volume © one new Russian
Determine the mass by weighing, the volume – by the mass (or volume) of displaced water. Georgy Messages: 282 Registered: Wed Mar 02, 2005 8:52 pm Message Georgy » Fri Apr 20, 2007 2:37 pm I get it, I’ll be a bastard, I get it!
Sovetnik Messages: 2100 Registered: Mon Oct 24, 2005 12:00 pm Message Sovetnik » Fri Apr 20, 2007 4:17 pm Georgy, look at the last post here:
http://www.chemport.ru/guest2/viewtopic . C%E0%E5%EC
Alexey Khrushchev Messages: 284 Registered: Thu Oct 06, 2005 5:21 pm

Re: Identify metal

Message Alexey Khrushchev » Fri Apr 20, 2007 4:24 pm You can check electrochemically: your anode is a block, on it is a drop of an electrolyte solution, salt, for example, the cathode is graphite from a pencil, all this to the battery, if there is no cloudiness in the solution, then you are fabulously rich – this is platinum metal vano Messages: 616 Registered: Fri Nov 19, 2004 1:36 pm Contact Information:

Re: Identify metal

Message vano » Fri Apr 20, 2007 7:57 pm We should not forget about passivation; tantalum also does not dissolve in any of the above.
Archeolog Messages: 1891 Registered: Sat Aug 27, 2005 2:08 pm Contact Information:

Re: Identify metal

Message Archeolog » Fri Apr 20, 2007 8:40 pm Georgy wrote: Hello, dear ones!
A friend’s father died and left behind pieces of metal. The metal is silver in color, quite hard, can be taken with a file, but not easily, much more difficult than steel3, in nitrogen, hodgepodge and sulfur – zero reaction, at least at room temperature. It is assumed that it is not an alloy. How can you determine what kind of metal it is?
Thanks for the tips. PS
Sentence:
Guilty of lameness! Can I look at a photograph of the metal? Maybe, in the absence of all other data, we can say something about it. I have already decided everything, and don’t try to confuse me with facts!
Konstantin_B Messages: 2623 Registered: Wed Mar 22, 2006 11:51 am Message Konstantin_B » Fri Apr 20, 2007 9:12 pm Why are we boiling, it also looks like stainless steel. Better photo!
Sergel Messages: 9780 Registered: Mon Aug 21, 2006 8:01 pm

Re: Identify metal

Message Sergel » Fri Apr 20, 2007 9:15 pm The question is what acids were they used with, diluted or concentrated?
I suspect it is titanium or stainless steel. Georgy Messages: 282 Registered: Wed Mar 02, 2005 8:52 pm Message Georgy » Sat Apr 21, 2007 12:16 am eukar, Sovetnik
Thank you very much! This is what we need. Alexey Khrushchev
I’ll definitely try it tomorrow, thanks Konstantin_B, Sergel
I know titanium and stainless steel well, I work with them a lot, so this option is out of the question (fortunately!)
concentrated acids of course vano
thank you, this info will help Photos are located at:
giapic@yandex.ru
password: 1234567 I tried to determine the density using Sovetnik’s hint:
“You can determine the density of an alloy very simply in 1 minute.
What is needed:
– electronic scales with a weighing accuracy of no worse than 1 g, even commercial scales are suitable;
– a vessel with a wide neck (jar) into which a sample of the alloy would fit.
Next:
1. We weigh the alloy, its mass is Msp.
2. Pour water into a jar, put it on the scales and weigh it, its mass is MB, do not remove the jar from the scales.
3. We tie the alloy with a thread and, holding the thread in our hand, lower the alloy into a jar of water so that the water completely covers the alloy, preventing the alloy from coming into contact with the walls and bottom of the jar. We take readings from the scales – Mv.
4. Calculate the density of the alloy: p = Msp/(Mv-Mb) g/cmXNUMX.” here is my data:
Msp = 6,850 g
MB = 56,350 g
Mv = 57 g p = Msp / (Mv-Mb) g/cm.cub.
p = 6,850 / (57-56,350) = 6,850 / 0,65 = 10 g/cm538. adjusted for possible errors (all the way during the weighing process I had a feeling of some kind of Pithecanthropus, I felt like an ancient, backward, ignorant of electronic scales, but a cunning Greek, testing a possibly brilliant idea that could glorify him for centuries! and of course, having finished weighing, I couldn’t resist shouting “Eureka!”) so metal with such a density falls into such an interval (there may be errors in the table, correct me), Rhodium 12,42
Ruthenium 12,2
Palladium 11,97
Thallium 11,85
Thorium 11,72
Technetium 11,5
Lead 11,34
Silver 10,5
Molybdenum 10,2
Lutetium 9,84
Bismuth 9,8
Thulium 9,33
Polonium 9,3
Erbium 9,05 Moreover, the density is exactly like that of silver, but it is by no means silver – I have been working with silver like this since I was 16 years old, that is, for 31 years now, and I would recognize it even if it had silicone implants like Pamelka Anderson!
It’s too late now, but tomorrow I’ll look at the properties of these metals in order to weed out the soft ones. But you can probably immediately name the metals that my metal cannot be, like polonium, etc. Due to its refractoriness and low coefficient of thermal expansion, this metal is widely used in electrical engineering, radio electronics, and high-temperature engineering. The hooks on which the tungsten filament in the light bulb is suspended are made of molybdenum. Many parts of radio tubes and X-ray tubes are made from it. Molybdenum spirals serve as heaters in powerful vacuum electric resistance furnaces, where very high temperatures develop. Rich molybdenum ore
Kharbeya Ore with an admixture of copper, considered harmful Molybdenum is most widely used in ferrous metallurgy. Approximately 80% of it is used in the production of stainless, low-alloy, tool and high-speed steels, superalloys, and cast iron. The high alloying ability of molybdenum is due to the fact that it has the same crystal lattice as iron. The radii of their atoms are also very close to each other. Well, it’s easy for “kindred spirits” to find a common language. Adding molybdenum to steel makes it much harder and tougher at the same time. Metal-cutting tools made of steel containing molybdenum have the property of being hardened during operation. However, molybdenum is friendly not only with iron. Alloys of molybdenum with chromium, cobalt, and nickel have excellent acid resistance and are used for the production of chemical equipment. Some alloys of the same elements are characterized by high abrasion resistance. Alloys of molybdenum and tungsten can replace platinum. For the manufacture of electrical contacts, alloys of this element with copper and silver are used. In stainless steels, this metal increases the alloying properties of chromium, which is important when used in high-temperature corrosive conditions in some chemical industries. Consumption of molybdenum is growing in new areas of application, including: the production of car bodies from sheet steel, the use of molybdenum electrodes in magnetrons, the production of powder-sintered substrates for semiconductors and neodymium-iron-boron magnets. The use of molybdenum-containing steels and alloys is growing, especially in oil and gas pipelines. The level of molybdenum content in modern pipes has increased from 0,1% to 0,2-0,3%. New developments in steels for oil and gas pipelines could double this amount. The oil drilling sector is growing more slowly, but the use of molybdenum-containing steels to replace low-carbon steels when drilling in elevated temperatures, pressures and corrosive environments is increasing. Roof of the adit crossing the ore zone Small veins with molybdenite The use of molybdenum as a catalyst for oil refining is also growing due to the growing need for low-sulfur gasoline. About 95% of oil refineries use molybdenum-containing catalysts to remove sulfur in the production of ultra-low-sulfur diesel fuel, where molybdenum consumption is growing at 6-8% per year. About fifty alloys containing molybdenum from 1% to 25% are used in gas turbines. Thanks to molybdenum’s ability to resist hot corrosion. A large market for molybdenum is the nuclear power industry, which is transitioning to stronger pipes made from molybdenum-containing steels for coolants in new reactors. Another new application for molybdenum in nuclear power plants is microbiologically resistant stainless steels used in cooling systems. The new generation of nuclear power plants can use 180 – 230 tons of molybdenum each. Another development involving molybdenum in nuclear energy is research into the use of uranium-molybdenum alloys as fuel. The radiation resistance and mechanical properties of nuclear fuel are improved after uranium is alloyed, during which small amounts of molybdenum, aluminum and other metals are added to the uranium. Alloying additives reduce the number of fission neutrons per neutron captured by nuclear fuel. Therefore, they tend to select alloying additives for uranium from materials that weakly absorb neutrons. Dispersed nuclear fuels, in which small particles of UO₂, UC, PuO₂ and other compounds of uranium and plutonium are placed heterogeneously in a metal matrix of aluminum, molybdenum, stainless steel, etc. The matrix material determines the radiation resistance and thermal conductivity of the dispersion fuel. For example, the dispersed fuel of the first nuclear power plant consisted of particles of an alloy of uranium with 9% molybdenum, filled with magnesium. Interest in plutonium alloys is mainly due to the possibility of using them as fuel in nuclear reactors. Such fuel can be of two types: liquid and solid. The idea of fuel in the form of a liquid plutonium alloy was proposed back in 1946. However, such alloys consist entirely or mostly of the £-phase of the uranium-plutonium system, which has such unfavorable metallurgical properties as high fragility, low strength, low corrosion resistance and, finally, , poor resistance to radiation. To overcome these harmful features, extensive research has been undertaken on ternary alloys of uranium, plutonium and a third element in order to suppress the formation of the £ phase. This goal has been most successfully achieved by adding molybdenum to uranium and plutonium, although it is assumed that other elements (for example, ruthenium) are also effective in helping molybdenum suppress the £ phase, increasing the thermodynamic stability of solid solutions. In experiments with moderate burnup, uranium-plutonium-molybdenum alloys showed fairly good resistance to irradiation. Since one of the main fission products of plutonium-239 is molybdenum, the idea arose to stabilize the phase through the so-called uranium-plutonium alloy – a mixture of fission products dominated by molybdenum, ruthenium and other elements that stabilize this phase. Such an alloy has known advantages regarding reactor operation and fuel regeneration. The expansion of the use of molybdenum comes from the need for disposal of used nuclear fuel, requiring molybdenum for the manufacture of containers. См. также