SU596634A1 - Slag-forming mix - Google Patents

Description

(54) SLAG FORMING MIXTURE

The invention relates to ferrous metallurgy, in particular to the branch (steel in the top of the pipe.

Known slag-forming mixture for steel casting, containing, wt.%:

Fluorspar15;

Manganese Ore20;

Silicate clump10;

Aluminum powder12;

Blast-furnace slag43; iO

The disadvantage of the mixture is that, during steel casting, toxic fluorine and manganese gas compounds are released from the steel, which deteriorate the sanitary and hygienic working conditions.

The known "formative mixture for steel casting, containing, wt.%:

Aluminum powder8-12

Apomagnemic Powder4-6

Sodium nitrate 10-15

Silicate clump15-30

Fluoric UniaTSh-25

Home1 slag15-50 Spent electroslag welding fukus

pereplav10--20.

While the waste flux of electroslag remelting may contain, wt%:

Calcium fluoride60-70

Aluminum oxide j 5-30

Calcium Oxide 15-30 2

The disadvantage of this mixture is that it is made using materials containing nitrogen and fluorine compounds, which, when casting steel, are released into the atmosphere and impair the sanitary and hygienic working conditions.

The purpose of the invention is to eliminate toxic emissions from the slag-forming mixture when casting steel.

This goal is achieved by using materials containing a limited amount of toxic compounds in a mixture. The following materials are used as such materials, wt.%: Spent welding flux. 30-50

Domain nshak40-60

Aluminum powder 8-15.

You can use the waste weld flux of the following composition, wt.%:

Silicon dioxide 38,32-42,12

Aluminum oxide 1 1.00-3.12

8.56-10.60

35.97-37.88 4.80-5.26

Claims (2)

1.52-2.85 ____________ 2,12-2,98 0,10-0,15 0,0-0,15 When casting steel tested three mixtures (see table). FORUMUA AND 3 ABOUT AND .one. Slag-forming mixture for steel casting, containing slag, aluminum powder and treated welding flux, characterized in that, in order to eliminate toxic emissions during the expansion of steel, it contains components in the following ratio, wt.%: Spent welding flux 30-50 Blast furnace slag40-60 Aluminum powder 8-15. 2. The mixture according to claim 1, characterized in that the spent welding fdpos has the following composition, wt.%: The components of the mixture were thoroughly mixed in a cold state and put to the bottom of the molds before casting. Mixture consumption 3-5 kg per 1 ton of steel. The use of the mixture in the casting of steel makes it possible to produce ingots with a good surface and macrostructure. The slag formed from the mixture has a low adhesion to the mold, as a result of which the labor intensity of preparing the molds for casting is reduced. When using slag, the amount of toxic excretion in the surrounding atmosphere decreases by a factor of 2-2.5. Silicon dioxide 38,32-42,12 Aluminum oxide 1.00-3.12 Kalyrsh oxide8,56-10,60 Manganese Oxide35,97-37,88 Iron oxides 4.80-5.26 General content fluoride compounds 1,52-2,85 Magnesium oxide 2.12-2.98 Sulfur0.10-0.15 Phosphorus 0.10-0.15. Sources of information taken into account expertise: 1. Steel casting and ingot quality. Sat articles.,, 1971, p. 25. 2. USSR author's certificate No. 336086 22 D 27/06, 1972.