SU558945A1 - The method of obtaining ligatures - Google Patents

Description

I

The invention relates to ferrous metallurgy, namely to ferroalloy production.

Currently, boron ligatures are produced by fusing ferroalloys with ferroboron.

A known method for producing a boron-containing ligature obtained by mixing in a ladle or mold of liquid ferroboron and ferroalloy l,

The disadvantage of this method is the high oxidation of the components, since the mathewies are mixed in a liquid state. The ligature is subjected to over-cutting during crushing.

The purpose of the invention is to obtain ligatures containing silicon, boron and other components by mixing silicocalcium with ferroboron in a mold and reducing overgrinding when crushing metal ingots without losing the alloying elements of the ligature.

This is achieved by the fact that the silicixalcium is deoxidized with aluminum to its content in silicocalcium 2-10%, then it is poured into molds and cooled to that

Perurature 500-12 OO C a layer of silicocalcium poured ferroboron and mix them,

At the furnace outlet, 25-125 kg per ton of silicocalcium was deoxidized. In the process of deoxidation, the aluminum content in the alloy rises to 2-10%. Aluminum B: ferroalloy, forms chemical compounds with alloy elements; for example Re, which have a reduced oxidation capacity. The acidic ferroalloy is poured from the ladle into the mold with a layer of 5-10 mm. On the cooled layer to a temperature of 5OO-12OO ° C, ferroboron is crushed, crushed to a fraction of 2O-4O mm with a boron content of more than 5%. Next on SLSL. ferroboron pour the main amount of deoxidized silkshalsi.

As a result of the convective metal flows that occur when pouring from the ladle, the ferrobor is dissolved.

Claims (1)

When mixed, a strong boron of aluminum forms. The boride formation reaction proceeds with the release of heat, which ensures uniform boron distribution and ligature strength. This condition is achieved only in the TOW case, when the residual aluminum content during the deoxidation of the ferroalloy before mixing changes from 2 to 1O%. If the temperature of the Si-Col-Lb layer is lower than 500 ° C, then the heat of the ekaohermic reaction of the formation of aluminum boride and the heat of the cast melt will not be enough and the layer will not melt completely. If the temperature is higher than 1200 s, then the ferroboron quickly passes through the liquid layer of the original ferroalloy, which also worsens the distribution of boron. PRI me R. An industrial electric furnace with a capacity of 25OO kV is charged with a charge of up to one colos. The collar ear contains 15X kg of lime with a content of 96% CaO, 240 kg of ferrosil (11) and 35 fluorspar. After the entire charge has been melted, the melt is released into the ladle. The metal at the outlet from the furnace contains 14.2% Ca, 4.17% S. 14 O kg A is placed at the bottom of the tank, which dissolves in silicocalcium as the ladle is filled with metal. 1913 kg of siliceous ferroNlav with content of 13.51% Ca, 46.6 .i, 5.86% AC, which is then poured in a layer of 10 mm thick into four cast-iron molds, is obtained from the scoop from the ladle. When this layer hardens and its temperature will be equal to 870 ° C, 180 kg of solid fbroboron (19.18% B) crushed to a fraction, 20-4 O mm, is evenly poured onto it with an even thickness of 30 mm. But then they give smayyunie in the mold of solid ferroboron with .6i -Ca-iA. The resulting ligature in the amount of 2110i r s contains,%: Ca11.7 Si40.8 B1.63 Le5.2 Geothermal. The use of boron is 100%. The igatura is crushed on a neck crusher to a fraction less than 10 mm, and then sieved. The fractional fraction less than 1 mm was 0.46% of the weight of the ligature. The ligature was tested with a positive result in the production of steel. CLAIMS A method for producing ligatures enclose shiys in mixing snlnkokaltsi with ferroboron in the mold of tlichayuschiys in that, in order to increase the use of elements of the ligature and contraction losses ligature during crushing, silicocalcium desalted in kszhshe aluminum to its content in Silicocalcium, and mold on the slate cooled to 50012OO ° С, silicocalcium is poured ferroboron and mixed them. Sources of information taken into account during the examination: 1. US patent number ZOZO204, class 75-122, 1962.