SU535355A1 - Method of smelting charge billet - Google Patents

Description

(54) METHOD OF MELTING THE SILES SCHEDULE

complete restoration of oglin, but also the melting of metal melt with silicon in the amount of 1-2 weight.

carbon

(amount 0.5-0.8 wt.%. - As a result, the next portions of scale, which are sown with a basement, are reduced not only by a solid reducing agent, silicon carbide, but also by silicon and carbon, dissolved. in the LID metal, on boundary of the oxide and metal phases.

Moreover, the iBbicoKoe content of a silicon carbide — At the top of the table, ensures sufficient electrical conductivity of the charge, which makes it possible to stabilize the electrical regime and increase the rate of melting of the scale in the filling.

The amount of reducing agent in the tumbling is determined by the stoichiometric 1M ratio resulting from the reduction of carb: datum scale, silicon, m, taking into account the waste of the reducing agent, for example, in a suction unit.

At the end of the process, the liquid-moving slag was broken up; the latter should be squeezed in conjunction with lime, i.k., the lime additive reduces the refractoriness of the acid slag, saturated with silica.

The proposed amount of mixture injected into the slag of the melting period, as well as

1P; the proposed ratio of the components in it allows one to achieve the reduction not only of tungsten from slag, but also of such hard-to-reduce oxides, as oxides, and oxide and chromium. This is due to the increased reactivity of the slag with the introduction of IB. Of more lime and an excess of active reducing agent.

Example. In the 5-ton electric arc furnace, three melts of the charge material were melted out of the scale of high-speed steel Р6М5. The filling consisted of 2000 kg of dross and 600 kg of silicon carbide powder. 35 minutes after the start of melting, the first basement was carried out (1200 kg of dross and 220 kg of silicon carbide), and another 30 minutes later the second basement was carried out (800 kg of alkaline and 150 kg of silicon carbide). The slag of the melting period was dissolved for 20-25 minutes with a mixture of carbide and limestone (30% SiC, 70% CaO) in an amount of 50 kg per ton of shed. General melting time averaged 1 h 55 min. The metal is released B bucket at 1500 ° C.

| The table shows the data obtained during the smelting of the charge billet from the scale of high-speed steel R6M5. Proposed (top line) and known (bottom) methods (it was carried out, three melts).