A method of producing granules and powders of rare and radioactive metals and their alloys

 

(57) Abstract:

The invention relates to metallurgy, in particular, to obtain granules and powders of rare and radioactive metals and their alloys. In the proposed method, including receiving from a source mixture of chemical compounds of rare and radioactive metals in a crucible melting furnace, molten metal by restoring chemical compounds by metal-reducing agent according to the invention from the obtained molten metal is removed or crystallized slag melt, after which the resulting melt is poured from the crucible to the dispersion of the jet into droplets, which is cooled and crystallized, and upon receipt of granules and powders of alloys in the initial charge of introducing alloying elements in the form of chemical compounds, metals, alloys, interacting with the metal-reducing agent with the formation of flux. Improved quality of products, reducing waste and increasing equipment life. 5 C.p. f-crystals.

The invention relates to metallurgy and, in particular, to obtain granules and powders of rare and radioactive metals and their alloys.

There are several ways of obtaining the metal is ieru, the dispersion into droplets, cooling and crystallization drops. The disadvantages of these methods is the need to use as source material pure metals or alloys, produced from clean components, which significantly increases the cost of the final powders and granules.

The closest in technical essence and the achieved result is a method of producing granules (see E. G. Rakov and other Processes and equipment for production of radioactive and rare metals. M.: metallurgy, 1993, S. 352-357), including receiving in a crucible melting furnace, molten metal by restoring chemical compounds by metal-reducing agent. The disadvantage of this method is that the obtained granules distributed in the mass of the slag and to retrieve the slag must be milled and leaching, which greatly complicates and increases the cost of the process. In addition, this method does not allow to obtain pellets of a specified particle size distribution.

The technical result of the invention is to reduce the number of technological operations and energy consumption in the production of granules and powders of metals and their alloys by using as a raw material of Kotor is by products, reducing the amount of waste generated and increase the life of the equipment.

The technical result is achieved in that in the method of producing granules and powders of rare and radioactive metals and their alloys, including receiving from a source mixture of chemical compounds of rare and radioactive metals in a crucible melting furnace, molten metal by restoring chemical compounds by metal-reducing agent. From the obtained molten metal is removed or crystallized slag melt, after which the resulting melt is poured from the crucible to the dispersion of the jet into droplets, which is cooled and crystallized.

Alloying elements can be added in the initial charge in the form of chemical compounds, metals and alloys, which interact with the metal-reducing agent with the formation of flux.

Receiving molten metal is carried out in a sealed induction furnace with copper split water-cooled crucible, transparent to electromagnetic fields from moving inside the copper water-cooled crucible tray, and its discharge through the discharge device located in the upper part of the crucible wall and the pallet(RF patent No. 2177132).

Metal RA crucible, transparent to electromagnetic fields, and installed inside of the crucible Villeroy with calibrated holes.

The slag melt is removed when you move the pan up drain trench, located in the upper part of the crucible wall.

Proceeding with the release of a large amount of heat metallothermic reactions can eliminate or significantly reduce the energy consumption for melting. Alloying elements are also feasible to be introduced in the initial charge in the form of cheaper than pure metals, chemical compounds, provided that they also recovered by metal-reducing agent. The greatest effect is achieved when generated during the recovery of the alloying elements slag is the flux to reduce the melting point of the slag or improving other physical-chemical properties (viscosity, surface tension, etc), providing complete separation of metal and slag melts.

Remove or crystallization of the slag before discharge molten metal eliminate the ingress of the slag melt to pour out the metal melt and do not contaminate the latter.

The use of induction furnace with cold crucible for metallothermic metals and alloys are not contaminated by the material of the crucible. The application of the discharge device to melt in the form of induction melting node with cold crucible also ensures a long service life, and also, due to the practical businessconnect induction heating makes it possible to efficiently regulate the temperature of the die and drained melt within the specified range.

Experimental validation of the proposed method was performed in a vacuum induction furnace with cold crucible with a diameter of 200 mm, water-cooled copper plate, which moves inside the crucible, and the two discharge devices: in the form of a trough in the upper part of the crucible wall and the pallet in the form of melting node with cold crucible with a diameter of 40 mm with plug-in this crucible Villeroy with holes of different diameters.

Example 1. In the cold crucible was loaded portion of the charge, consisting of uranium tetrafluoride and shavings of metal calcium taken with an excess of 10 wt.% from the stoichiometric required, the furnace was sealed and initiated metallothermic reaction. After completion of the reaction, the products of melting was cooled to 1200C, leading to crystallization of the slag of calcium fluoride (tpl.-S), but not uranium metal (tpl.-S). The temperature Urano is of the inductor discharge device in the pan, heating the die plate and melting tube from zakristallizuetsya uranium melt. Uranium melt flowed through the die plate 3 mm in diameter, fell on a cooled rotating disk and crystallized in the form of granules.

Example 2. The initial charge consisted of neodymium TRIFLUORIDE, trichloride iron and boron powder, taken in the ratio required to obtain Nd-Fe-B, and shavings of metal calcium taken with an excess of 10 wt.% in excess of the stoichiometry for the recovery of neodymium fluoride and ferric chloride to metal. Introduction in charge of iron in the form of trichloride iron led to the formation metallothermic reaction flux - l2providing fusible slag when mixed with calcium fluoride formed during the recovery of neodymium fluoride. After passing metallothermic reaction tray was moved up to the full discharge of the slag melt the chute. The pallet is returned to its original position, supporting the induction currents in the melt temperature neodymium-iron-boron level S. It was further applied voltage on the inductor discharge device in the pan, heating the die plate and melting tube from zakristallizuetsya uranium melt. The melt does not the very in the form of fine powder.

Example 3. The initial charge consisted of crystalline powders tetrafluoride, zirconium and niobium metal powder taken from a calculation of obtaining alloy zirconium - 2.5 wt.% niobium, and shavings of metal calcium taken with an excess of 5 wt.% in excess of stoichiometry for recovery of zirconium fluoride to metal. The mixture was heated in an argon atmosphere to 300C and initiated metallothermic reaction. The melting temperature of products amounted to 2000S. After passing metallothermic reaction tray was moved up to the full discharge of the slag melt the chute. The pallet is returned to its original position, supporting the induction currents the temperature of the zirconium-niobium melt level S. It was further applied voltage on the inductor discharge device in the pan, heating the die plate and melting tube from zakristallizuetsya uranium melt. Zirconium-niobium melt flowed through the die plate 1 mm diameter, fell on the cooled rotating disk and crystallized in the form of fine powder.

Thus, the above examples demonstrate the effectiveness of the proposed method for producing granules and powders of rare and radioactive metals and their alloys.

1. The way the floor is chemical compounds rare, radioactive metals in a crucible melting furnace, molten metal by restoring chemical compounds by metal-reducing agent, characterized in that the obtained molten metal is removed or crystallized slag melt, after which the resulting melt is poured from the crucible to the dispersion of the jet into droplets, which is cooled and crystallized.

2. The method according to p. 1, wherein upon receipt of granules and powders of alloys in the initial charge of introducing alloying elements in the form of chemical compounds, metals, alloys.

3. The method according to p. 2, characterized in that the chemical compounds of the alloying elements interact with the metal-reducing agent with the formation of flux.

4. The method according to p. 1, characterized in that the receiving molten metal is carried out in a sealed induction furnace with copper split water-cooled crucible, transparent to electromagnetic fields, moving inside a copper water-cooled crucible tray, and its discharge through the discharge device located in the upper part of the crucible wall and the pallet.

5. The method according to p. 1 or 4, characterized in that the metal melt is poured through a built-in pallet indui installed inside of the crucible Villeroy with calibrated holes.

6. The method according to p. 1 or 4, characterized in that the slag melt is removed through the drain trench, located in the upper part of the crucible wall, moving the tray up.

 

Same patents:

The invention relates to ferrous metallurgy and can be used to obtain high-purity powders of tantalum and niobium with a large specific surface for the production of capacitors

The invention relates to powder metallurgy and can be used to obtain high-purity powders of tantalum and niobium with a large specific surface for the production of capacitors
The invention relates to the field of powder metallurgy and concerns a method for obtaining powders of refractory compounds on the basis of a carbide or nitride of titanium compounds that can be used for the production of cutting tools, metal fittings, etc

The invention relates to the production of powders of refractory metals and can be used in enterprises: non-ferrous metallurgy in the production of high-quality hard alloys; chemical industry for preparation of catalysts; the electronics industry in the manufacture of bodies glow and so on

The invention relates to powder metallurgy, in particular to the manufacture of powders based on iron, and can be used in chemical industry and medicine

The invention relates to ferrous metallurgy, in particular to obtain a powder of alloys based on titanium metals, soluble in liquid magnesium, metallothermic recovery of titanium chloride (IV)

The invention relates to powder metallurgy, in particular the production of highly dispersed iron powder materials having a high surface activity and used as biologically active agents or catalysts

The invention relates to powder metallurgy, in particular to installations for the production of powders of metals and their alloys by spray melt compressed gas

The invention relates to the production of metal powder by atomization

The invention relates to powder metallurgy, to a device for the manufacture of cast metal fractions

The invention relates to a device for producing powders by atomization of molten materials
The invention relates to the chemistry of organosilicon compounds, in particular to methods for organoselenium silanes, and can be used to obtain silicone fluids and resins of various types

The invention relates to powder metallurgy and, in particular, to methods for producing powders of aluminium and its alloys by sputtering

The invention relates to methods of producing metal granules by spraying molten metal

The invention relates to metallurgy, in particular to a device for producing metal granules by spraying molten metal
The invention relates to the field of powder metallurgy, specifically to the production of powders of aluminum-magnesium alloys by sputtering technique melts compressed gas, almost not interacting with molten aluminum

The invention relates to powder metallurgy, namely, devices for metal powders by atomization of melt jet gas flow, and can be used for production of powders of aluminum, bronze, zinc, etc

FIELD: powder metallurgy, manufacture of finely dispersed powders with improved physical and chemical properties, namely of aluminum-zinc powder with spherical grains.

SUBSTANCE: aluminum powder with spherical grains according to invention has specific surface no less than 0.7 sq. m/g at next content of particles by mass, %: less than 1.0 micrometer, 8 - 12; 1 - 3 micrometers, 53 - 77; 3 - 5 micrometers, 15 - 38; more than 5 micrometers, no more than 10. Method for producing powder comprises steps of pulverizing melt with use of compressed gaseous nitrogen for receiving poly-dispersed pulverized product; extracting powder from pulverized product due to sorting by size fractions. Melt is pulverized by means of compressed gaseous nitrogen containing 0.1 -0.4 vol. % of oxygen at temperature of gas 550 -680 C, gas pressure in jet 5 - 6 Mpa, gas flow rate 600 - 1200 cub. nm/h. Temperature of melt is sustained in range 850 - 990 C.

EFFECT: possibility for producing powders of predetermined chemical content and fraction size, enhanced safety of manufacturing process.

4 cl

FIELD: processes for producing FeCrAl material.

SUBSTANCE: method for producing material in the form of powdered metallurgical FeCrAl alloy (by gas spraying) containing besides iron, chrome and aluminum small dozes of molybdenum, hafnium, zirconium, yttrium, nitrogen, carbon and(or) oxygen comprises steps of preparing melt subjected to spraying and containing 0.05 -0.50 mass % of tantalum and less than 10 mass % of titanium and having such composition that provides preparation of sprayed powder of next content, mass %: Cr, 15 - 25; Al, 3 - 7; Mo, 0 - 5; Y, 0.05 - 0.60; Zr, 0.01 -0.30; Hf, 0.05 - 0.50; Ta, 0.05 - 0.50; Ti, 0 - 0.10; C, 0.01 -0.05; N, 0.01 - 0.06; O, 0.02 - 0.10; Si, 0.10 -070; Mn, 0.05 -0.50; P, 0 - 0.08; S, 0 - 0.005; Fe, the balance.

EFFECT: possibility for producing powder material with improved strength properties.

7 cl

Up!