SU823436A1 - Slag forming mixture for smelting synthetic slag - Google Patents

Description

Iobrazhenie- refers to ferrous metallurgy and can be used, for example, in steelmaking in the preparation of slag-forming mixture for smelting synthetic slag used for the subsequent refining of steel. The known slag-forming mixture for the production of synthetic slag, consisting of clinker (previously finished in a special arc furnace, slag of alumnothermic production of ferrotitanium), which is used in a mixture with lime to produce foreign extrudable iron. synthetic slag SC. The disadvantages of the known mixture are its high cost and the difficulty of melting in the slag-smelting furnace refractory cement-reduced slags of the aluminothermic production of ferro-titanium and metallic chromium. A known charge for the production of synthetic slag containing high-grade. earth materials, waste slags from aluminothermic ferro-titanium production, waste slags from aluminothermic production of boron-containing alloys and lime 2. The disadvantages of the known charge are its rather high cost and scarcity. In addition, alumina-containing materials loaded into the furnace and lime are refractory components of the charge, which require a lot of electricity and time to melt. The known slag-forming mixture for smelting synthetic slag, lime containing re-reduced slags of aluminothermic production of ferrotitanium and metallic chromium, waste slag of aluminothermic production of ferrotitanium and boron-containing alloys and spent hardened synthetic slag | g. However, to produce a hardened synthetic material, it is required to make

the development of special installations for the pouring of liquid waste synthetic slag and the construction of a special department that requires additional capital expenditures.

The purpose of the invention is to reduce the cost of synthetic slag.

This goal is achieved by the fact that high-alumina materials (for example, newly reclaimed slags of aluminothermic production of ferrotitanium and metallic chromium), dump slags of aluminothermic production of ferrotitanium and boron-containing alloys, additionally burned dyes and mills, were added to the slag-forming mixture containing lime, aluminothermic production of ferrotitanium and boron-containing alloys. in the following ratio, wt.%;

Lime35-5O

Burnt Dolomite5-30

Fireclay2-15

Dump slags

aluminothermic

production of ferrotitanium5-15

Dump slags

aluminothermic.

production of borsoder

harvesting alloys 3-10

Restored

Ti aluminothermic slags

ferrotitanium5-10

Restored

aluminothermic production slags

metallic chrome5-10

The limits of the ratios of the components of the slag-forming mixture for smelting synthetic slag in a slag-melting furnace (in particular, lime) are due to the production of slag containing 5057% calcium oxide in the slag (35-50% lime in the mixture), taking into account the fact that a part of calcium oxide is introduced by other components of the mixture - dolomite and waste slag.

The lower limits of the ratios of used burned dolomite (5%), chamotte (2%), dump slags of aluminum; thermal production of ferrotitanium (5%) and boron-containing alloys (3%), self-reduced slags of aluminothermic production of ferrotitanium (5% and metallic chromium ( 5%) are due to the fact that these quantities are those minimum values when the cost reduction of the synthetic

slag, and, therefore, refined steel, is cost-effective, taking into account the costs of preliminary preparation of materials,

Upper limits of the ratios of used calcined dolomite (30%), fireclay (15%), dump slags of aluminothermic production of ferrotitanium (15%) and boron-containing alloys (10%), additionally built slags of aluminothermic production of ferratitanium (10%) and metallic chromium (10%) condition.-; The need to produce low-grade synthetic slag. Harmful impurities with high desulphurization ability and fluidity. At the same time, the maximum effect of reducing the cost of synthetic slag and refined steel is achieved.

Slag-forming mixture suggests the possibility of complete elimination from it of high-alumina reclaimed slags of aluminothermic production of ferrotitanium and metallic chromium with a simultaneous equivalent increase in the proportion of burnt dolomite and chamotte.

P m and me r 1. The slag-forming mixture for smelting synthetic slag in a slag-melting furnace contains, in wt%: lime 35; burnt dolomite 30; fireclay 2; dump slags of aluminothermic production of ferrotitanium. 15; dump slags of aluminum thermal production of boron-containing alloys 3; reinstated; slags of aluminothermic production of ferrotitanium 10 and pre-reduction slags of aluminothermic production of metallic chromium 5.

After it is melted in a smelting furnace, synthetic slag of the following chemical composition is obtained,%: CaO 51.2; AC2O 28.3; 3.5; TiO2 4.5; Sch2Oz-OD4; 0.03;

FeO 0.65 and MgO the rest.

When refining steel 09G2F6 in this way, the sulfur content in steel is reduced from 0.018 to 0.005%. The cost of synthetic slag is reduced by 20%.

Example 2. Slag-forming mixture for smelting synthetic slag in a slag-melting furnace contains, in wt%: lime 50; burnt dolomite 5; fireclay 15; dump slags from aluminothermic ferrotitanium production 5; dump slags of aluminothermic production of boron-containing alloys 10; before-

Claims (1)

Claim 35-50 5-30 2-15 ' 5-15 Slag-forming mixture for the smelting of synthetic slag, including lime, unreduced slags of aluminum - ₁₅ non-thermal production of ferrotitanium and metal chromium, dump slags of the aluminothermic production of ferrotitanium and boron-containing alloys, characterized in that _(in order to reduce the cost of synthetics—) it is additionally heavy slag contains calcined dolomite and chamotte, in the following ratio of components, wt.%: Lime Calcined Dolomite Chamotte Slag heaps of aluminothermic ferrotitanium production Slag aluminum-thermal slag production boron ore shnkh alloys Reclaimed aluminum-thermal slag production of ferrotitanium Reclaimed aluminum-thermal slag production / ¹ chromium metal production