The method of disposal of metal shavings

 

(57) Abstract:

The invention relates to the field of waste management industry, namely the processing of metal shavings. The product of the refining process may find application in the production of secondary alloys, metallurgical production in the doping. The disposal method is that the metal shavings, mainly titanium, pressed with simultaneous annealing, while the residual pressure in the chamber is 1.33 (10-1-10-3) PA temperature of 0.6 to 0.8 times the melting temperature of metal shavings and at specific pressing force 1 3 from the yield strength of the metal shavings at the temperature of extrusion. 1 C.p. f-crystals, 2 tab.

The invention relates to the field of waste management industry, namely the processing of metal, in particular titanium, chip. The product of the refining process may find application in the production of secondary titanium alloys, ferrous metallurgy during the alloying and deoxidation of steels.

The most common (45% of the total mass of waste) and the hardest to treat form of waste is chips. The difficulties arising in its preparation for use, due to the fact that allow by processing them into briquettes, for example briquettes for the inoculation of cast iron briquettes for the production of metals.

Closest to the present invention is a method of disposal of titanium waste using cold briquetting figured punch at specific pressing force 450-600 MPa. These briquettes can then be used as electrode for melting ingots. This method allows you to enter in the electrode up to 70% of the chips. The resulting briquettes are bendingtechnology4mpa, density of 0.6-0.7 from theoretical.

A significant drawback of analogs and prototypes are limits on the amount of input waste (70%), low density electrode (0,6-0,7), which significantly reduces the mechanical properties of briquettes and performance during the smelting process; causing the need for a separate operation of vacuum annealing chip, without which the melting is almost impossible because of the strong outgassing.

The aim of the invention is to provide a method of recycling of metal waste, providing the product with a 100% content of the waste, the increase in strength properties and density.

The aim is achieved in that a mixture consisting solely of metal scrap, compressed with dela flow of metal at the temperature of extrusion, at a residual pressure in the chamber of 1.33 (10-1-10-3) PA within 30-60 min, while in the process of heating under pressing is carried out by vacuum annealing chips for removal of gases.

The method is as follows.

Metal chips, such as titanium alloy, are crushed in a hammer mill type 188 OTHERS to the size of individual particles (5-10)x(5-15) mm Milled chips are subjected to magnetic separation on the installation type, PBS-40 to remove iron particles, and then washed in a degreasing solution, for example containing 20 g/l of sodium carbonate and 30 g/l of trinacria phosphate, and then washed in water and dried. The thus prepared chips bitteroot in the press with force 6300 kN with evacuation zone pressing to a pressure of 1.33(10-1-10-3) PA, within 30-60 min Temperature briquetting for titanium alloys is chosen in the range 1000-1150aboutWith a specific pressing force is from 10 to 30 MPa. In the process of pressing to a density of briquette 0,8-0,9 from theoretical happens diffusion welding of the particles.

The materials used in the mixture are shown in table.1, which shows the parameters of the proposed method and the properties of the obtained brickw the briquette is provided, compared with the prototype, the increase in the density of 30-50% and the Flexural strength is 5-6 times. In the case when the parameters of the process are outside the lower limit (option 4), briquette properties in comparison with the prototype has no advantages. When the parameters for the upper limit (option 5) properties of the briquette is reflected at the level of the material obtained by the present settings. The provision of these parameters is associated with the complexity of the process (in particular, vacuum equipment) and a noticeable increase in energy costs that are not compensated for the resulting effect.

Options 6-9 show that similarly can be disposed of chips titanium alloys and other active metals such as zirconium and niobium.

The proposed method allows the use of metal waste by 100% compared to the prototype.

These briquettes are suitable for secondary smelting ingots, while melting of ingots is carried out in a standard vacuum-arc furnaces, in which melted almost all titanium alloys.

When implementing the proposed method there is no need to create new expensive metallurgical furnaces with electron-beam or plasma ISAT increased compared with serial alloy 0.05-0.1% impurity introduction, such as oxygen, nitrogen and carbon (table.2), which reduces their plastic characteristics. However, to apply such materials to the needs of the economy feasible and economically justified.

These briquettes can be used in ferrous metallurgy instead of ferrotitanium for alloying and deoxidation of steels. Replacement ferrotitanium on briketirovannogo titanium shavings gives you the opportunity to gain significant economic benefits as a result of sharp decline in the energy intensity of processes for the preparation of titanium-containing materials used in the steel industry, the release of smelting capacity for the production of ferrotitanium.

1. The METHOD of disposal of METALLIC CHIPS, including the preparation of the charge, vacuum annealing and pressing, characterized in that the extrusion is carried out in vacuum with simultaneous annealing.

2. The method according to p. 1, characterized in that the extrusion is carried out at a residual pressure in the chamber of 1.33(10-110-3) PA, a temperature of 0.6 to 0.8 times the melting point of the material of the chip, with specific pressing force 1 3 from the yield stress of the material of the chip.

 

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