The method of obtaining of titanium sponge

 

(57) Abstract:

The invention relates to ferrous metallurgy, in particular to methods of producing sponge titanium magnesium recovery. The invention will improve the performance of the recovery process by increasing the feed rate of titanium tetrachloride and improve the quality of sponge titanium. The method of obtaining sponge titanium includes the purification of titanium tetrachloride from dissolved gases in the crystallizer under vacuum, the flow of purified titanium tetrachloride in an apparatus for recovery and restoration of degassed titanium tetrachloride by magnesium, and titanium tetrachloride served in the office of recovery directly from the degasser under constant pressure and at speeds from 150 to 1500 kg/m2/h, and when cleaning up from gas in the crystallizer, the titanium tetrachloride is sprayed, maintaining a constant level and pressure drop of 0.45 to 0.60 MPa at a temperature of from -20 to +50oC. for 2 h.p. f-crystals.

The invention relates to ferrous metallurgy, in particular to methods of producing sponge titanium magnesium recovery.

A method of obtaining sponge titanium recovery of titanium tetrachloride with magnesium. The tetrachloride Chi and opportunities for intensification in the process of recovering magnesium degassed titanium tetrachloride. - /C. L. Russo, A. A. Putin, K. N. Pavlov//.- The scientific. proceedings of Giredmet. - Tom XL. - M.: Metallurgy. - 1972. - S. 186-199).

The article examines the process of titanium tetrachloride with different speeds and revealed the dependence of the quality of titanium sponge from the feed rate of titanium tetrachloride. However, the disadvantage of this method is that the process does not allow to increase the feed rate of titanium tetrachloride in an apparatus for recovery, due to the deterioration of the separation of magnesium chloride from magnesium, reduces the performance of the recovery process.

There is a method of producing metallic titanium - ed. mon. USSR N 213348, publ. 14.05.69, BI 17, in which the titanium tetrachloride stored in the vessel in an argon atmosphere, a vacuum with a liquid vacuum pumps, filled with liquid titanium tetrachloride. Then the original product serves it in the office of recovery.

The disadvantages of this method are the low quality of sponge titanium and low productivity of the process.

A method of obtaining sponge titanium - see kN. Magnesium production of titanium sponge. - /Baibekov M. K., Popov, C. D., Cheprakov I. M. //. -M. : metallurgy, 1984, - N-14, 33 - 34 prototype, in which Ter the t with purified argon, and then through pipelines by gravity through the devices of consumption serves to restore.

The disadvantage of this method with the prototype is that the titanium tetrachloride after degassing return in pressure vessels, where it is again in contact with the argon, contaminated, which leads to deterioration of the quality of titanium sponge. In the pressure tanks of argon again dissolved in the titanium tetrachloride and the device recovery escaped from it, which leads to an increase of gas pressure, a significant decrease in the feed rate of titanium tetrachloride into the reactor, and when you drain the excess pressure of the reactor is reversed diffusion of air into the apparatus of recovery, increased formation of lower chlorides of titanium and increase output garnishing and fine fractions sponge, i.e., lower quality of titanium sponge. On page 14 of the prototype of the recovery process described schematically and includes the process of submission of titanium tetrachloride according to the scheme depicted in Fig. 3 page 13 and in Fig. 15 page 33. These schemes describe the degassing process - cleaning gas of titanium tetrachloride and returning the cleansed gases of titanium tetrachloride back in the tank where it is stored under a positive pressure of argon, and the capacity of the activities of the recovery process by increasing the feed rate of titanium tetrachloride and improving the quality of titanium sponge.

This task is solved in that in a method of producing sponge titanium, including the purification of titanium tetrachloride from dissolved gases, vacuum degasser, the flow of degassed titanium tetrachloride in an apparatus for recovery and restoration of degassed titanium tetrachloride by magnesium with getting spongy titanium, what's new is that the titanium tetrachloride is served in an apparatus for recovery directly from the degasser under constant pressure, and when cleaning up from gas in the crystallizer, the titanium tetrachloride is sprayed and catch the drip tray, maintaining a constant level and the differential pressure at a temperature of from -20oC to +50oC.

In addition, in the crystallizer support the differential pressure is 0.45 to 0.60 MPa.

In addition, the titanium tetrachloride is served in the apparatus of the recovery speed from 150 to 1500 kg/m2/PM

The supply of titanium tetrachloride in an apparatus for recovery directly from the crystallizer at a constant pressure and speed from 150 to 1500 kg/m2/h allows to maintain the device permissible excess pressure and, thereby, improve the quality of sponge titanium.

Maintaining in the crystallizer certain level of titanium tetrachloride with nepredati constant pressure supply of titanium tetrachloride and thus, to maintain the highest feed rate of titanium tetrachloride in an apparatus for recovery, eliminates the pressure increase in the reactor, thereby increasing the quality of titanium sponge.

Sputtering of titanium tetrachloride in the crystallizer using nozzles and capture it in the droplet separator can speed up the removal of gases from titanium tetrachloride, and thereby improve the quality of sponge titanium.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant had not found the source, which is characterized by signs, identical to all the essential features of the claimed invention. The definition from the list of identified unique prototype, as the most similar set of features analogue, has allowed to establish the essential towards perceived by the applicant to the technical result of the distinctive features in the proposed method, set forth in the claims.

Therefore, the claimed invention meets the condition of "new is Italy conducted an additional search of the known solutions to identify signs that match the distinctive features of the prototype of the characteristics of the claimed method. The search results showed that the claimed invention not apparent to the expert in the obvious way from the prior art because the prior art defined by the applicant, not the influence provided the essential features of the claimed invention transformations to achieve a technical result.

Therefore, the claimed invention meets the condition of "inventive step".

An example implementation of the method of producing sponge titanium

The titanium tetrachloride in the storage tanks contains argon in an amount up to 300 l/m3the nitrogen - 200 l/m3the oxygen - 200 l/m3and other gases, such as chlorine, carbon monoxide and dioxide, hydrogen. Before serving in an apparatus for the recovery of titanium tetrachloride clear of dissolved gases in the crystallizer, where it is served by the pump, creating between the nozzle and the volume of the crystallizer pressure drop of 0.45 to 0.60 MPa at various temperatures from -20oto +50oC, and is sprayed through nozzles in the space of the degasser. Gases dissolved in the titanium tetrachloride, due to the pressure drop at OTDELENIE gas and titanium tetrachloride. The titanium tetrachloride again return to the ejector. The degasser is equipped with nozzles for spraying of titanium tetrachloride and a drip pan for collecting titanium tetrachloride, where titanium tetrachloride is supplied under constant pressure in the device recovery. In the crystallizer maintain a constant level of titanium tetrachloride and define it according to standard gauge, of the degasser under constant pressure and speed 150-1500 kg/m2/h by flow meters, such as rotameters, serves titanium tetrachloride in an apparatus for recovery. The feed speed is adjustable proportioning dispenser. The titanium tetrachloride is served in the apparatus of the recovery pipe under constant pressure, equal to the height, to which the degasser on the device recovery. The recovery process is at a temperature of 750-780oC and a gauge pressure in the apparatus from 5.0 to 35 kPa. The process is without bleed excess pressure from the system and prevent the ingress of air as a result of reverse diffusion. By the end of the process is to achieve a given rate of utilization of magnesium (within 57-62%), stable or increasing pressure in the apparatus above of 29.4 kPa. The obtained titanium sponge has a low content of tx2">

Thus, the claimed invention will improve the efficiency of the process in 1,5-2 times by increasing the feed rate of titanium tetrachloride, to improve the quality of titanium sponge, reducing the content in the sponge components such as oxygen, nitrogen, carbon, and reduce the hardness of titanium sponge at 10-13 units (or up to 80-90% HB).

1. The method of obtaining of titanium sponge, which includes purification of titanium tetrachloride from dissolved gases, vacuum degasser, the flow of degassed titanium tetrachloride in an apparatus for recovery and restoration of degassed titanium tetrachloride by magnesium with getting spongy titanium, wherein the titanium tetrachloride is served in an apparatus for recovery directly from the degasser under constant pressure, and when cleaning up from gas in the crystallizer, the titanium tetrachloride is sprayed and catch the drip tray, maintaining a constant level and the differential pressure at a temperature of from -20 to +50oC.

2. The method according to p. 1, characterized in that in the crystallizer support the differential pressure is 0.45 to 0.60 MPa.

3. The method according to p. 1, characterized in that the titanium tetrachloride is served in the apparatus of the recovery speed from 150 to 1500 kg/m

 

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FIELD: metallurgy; reworking wastes of alumina production process.

SUBSTANCE: proposed method includes preparation of batch of charge containing red mud and carbon reductant, heating the charge in melting unit to solid-phase iron reduction temperature, three-phase reduction of ferric oxides in charge by carbon reductant and saturation of iron with carbon in charge thus prepared, melting the reduced charge for obtaining metal phase in form of cast iron and slag phase in form of primary slag, separation of cast iron from primary slag in melt heated to temperature of 40 C, reduction of silicon and titanium from oxides contained in primary slag by aluminum and removal of cast iron and primary slag from melting unit; during preparation of charge, concentrate of titanomagnetite ore containing titanium oxide in the amount from 1 to 15% is added to red mud; besides that, additional amount of carbon reductant and additives are introduced; after separation of primary slag from cast iron in melting unit, cast iron is heated to 1500-1550 C and product containing ferric oxide is added to it; iron is reduced by carbon of cast iron for converting the cast iron into steel at obtaining secondary slag; main portion of steel is removed from melting unit, secondary slag is added to primary slag and silicon and titanium are converted into steel residue in melting unit by reduction with aluminum, thus obtaining final slag-saturated slag and master alloy containing iron, titanium and silicon; main portion of master alloy is removed from melting unit; after removal of final slag for converting the master alloy residue to steel in melting unit, titanium and silicon are converted into slag phase by oxidation and next portion of charge is fed to slag phase formed after converting the master alloy residue to steel. Proposed method ensures high efficiency due to obtaining iron-titanium silicon master alloy in form of independent product and production of alumina from high-alumina final slag or high-alumina cement and concentrate of rare-earth metals.

EFFECT: enhanced efficiency due to avoidance of intermediate remelting of steel.

10 cl, 2 dwg

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