Method for obtaining briquette to obtain titanium- and zirconium-containing cast iron

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgical, casting production, and namely to production of cast irons operating under abrasive wear conditions. The method involves preparation of a mixture of initial material with further moulding. As initial material, crushed metal chips and metal scrap in the form of scale and scrap of ferrous metals, which are mixed with cryolite, and zircon and ilmenite concentrate, are used. Water solution (40%) of glyoxal is used as the binding agent. Components of the briquette are contained in the following ratio, wt %: metal chips and metal scraps in the form of scale and scrap of ferrous metals - 60, cryolite - 20, zircon concentrate - 7.5, ilmenite concentrate - 7.5, water solution (40%) of glyoxal - 5. The obtained mixture is homogenised by mixing, formed into a briquette by pressing and dried during 3 hours at 80°C.

EFFECT: according to the invention, use of briquettes will allow increasing wear resistance of the obtained cast iron.

2 cl, 2 dwg, 2 ex

 

The invention relates to metallurgy, foundry, in particular to the manufacture of cast iron, working in the conditions of abrasive wear.

There is a method of briquetting metal chips (RF patent No. 2251580, SW 1/248, SW 1/243, 10.05.2005). The invention relates to metallurgy and can be used in the processing of metal shavings and sludge waste Metalworking. Method of briquetting metal chips, including the crushing, cleaning, heating, adding a slurry, a binder, mixing and compaction in the mold. As a binder material, use water-cement paste 30-40%concentration in an amount of 4-7% by weight of the briquette. The invention will extrude maloplastichnye hard chips and increase the strength of the briquettes. Main disadvantages:

1) the Method does not provide input into the briquette alloying and/or modifiers.

2) Primeneniyu as a binder, the cement will adversely affect the quality of steel produced.

The known method for producing briquettes of particulate materials (Patent RF №2274666, SW 1/243, publ. 20.04.2006). The invention relates to the field of metallurgy, mainly to obtain briquettes of particulate materials formed during the fragmentation of ferrosilicon and its fractionation. The components of the mixture, with the standing mainly of dispersed silicon-containing filler - the main part of the mixture and of the powder component of the binder and water 10-30%solution of caustic soda, dispense, and deliver the mixing, pressing and hardening. As the powder component of the binder used camerascamera slag ferrochromium production in the amount of 3-25%. The solution of caustic soda before dispensing heated to a temperature of 30-100°C. the Invention will increase the strength of the briquettes to reduce the time of hardening, to reduce the loss of active silicon briquettes, to increase their solubility in molten metals and alloys. The disadvantage of the invention is the use of caustic soda as a binder, which requires special conditions for the production of briquettes and storage.

A known method of manufacturing briquettes from waste ferroalloys (RF Patent No. 2272082, SW 1/243, publ. 20.03.2006), selected as a prototype. The manufacture of briquettes from waste ferroalloys includes the preparation of a mixture of starting material with an aqueous solution of liquid glass processing a mixture of a wetting agent in preparation for briquetting and compacting the material into briquettes. As a repellent in a mixture of introducing solid carbon dioxide at the exit of the mixture from the mixer and before being loaded into a molding tooling. The invention will provide high with the speed of seals, to reduce adhesion of the mixture for forming the snap-to increase the density and strength of the briquettes. The disadvantages of the known invention is that it allows to process only the waste of the production of ferroalloys. For its manufacturing uses solid carbon dioxide that during the melting process using the obtained briquettes can lead to the formation of non-metallic inclusions and gas shells.

The present invention is to develop a method of producing briquettes to obtain titanium - and zirconium bearing cast iron to increase the corrosion resistance and performance characteristics of metals and alloys through the use of cheap materials.

The problem is solved in that a method of producing briquettes to obtain titanium - and zirconium bearing cast iron includes the preparation of a mixture of starting material, followed by molding, but unlike the prototype as a starting material used powdered metal chips and other metallic wastes (slag, ferrous metal scrap), multimodal with cryolite, zircon and ilmenite concentrate, and as a binder is injected glyoxal 40%, in the following ratio, wt.%

Metservice and met. waste (slag, scrap iron) - 60%

Cryolite - 20%

Zircon concentrate is Rath - 7,5%

Ilmenite concentrate is 7.5%

Glyoxal (R-R 40%) - 5%.

The resulting mixture was homogenized by stirring, compact the pellets through extrusion, which are then dried for 3 h at 80°C.

Cooking briquettes to obtain titanium - and zirconium bearing cast iron is made in 3 stages. Metal shavings, slag, ferrous metals are crushed to a fraction of 2-3 cm and mixed for 5 minutes in a mixer periodic action. Then in the amalgamator zircon, ilmenite concentrate and cryolite. The mixture is stirred for 10 minutes and then added a 40% solution of glyoxal. Further mixing is carried out for 5 minutes, after which the mixture is discharged in a mold and molded at low loads. These briquettes are dried for 3 hours at a temperature of 80°C.

An example of a specific implementation of the invention given below.

Example 1.

The mixture of metal shavings and scale (fraction 2-3 mm) in the amount of 60 wt.% pre-mixed in the mixer periodic action with zircon, ilmenite concentrate and cryolite within 15 minutes. A crosslinking agent is 40% solution of glyoxal was applied in an amount of 5%. The mixture was distributed in the form of 15×30 cm and were merged under the pressure of 0.3 MPa. Pressed pellets were enrolled in the drying oven was maintained at a temperature of 80°C for 3 hours.

Example 2.

On the same hardware was originally loaded a mixture of shredded ferrous scrap, zircon, ilmenite concentrate, cryolite and 40% solution of glyoxal. The mixture was mixed for 30 minutes, drying is carried out as in example 1.

The advantages of the present invention are:

1) Use as titanium and zirconium bearing additives concentrates ores, which contributes to cost reduction.

2) use as a cross-linking agent aqueous solution of glyoxal, which decomposes into gaseous products.

3) No need to use high pressures upon receipt of the briquettes.

Figure 1 presents the research results of weight loss of the samples in the conditions of abrasive wear, which confirms the increase of wear resistance of cast iron when using the present invention.

Figure 2 presents the results on the mass loss of the samples of iron when exposed to hydrochloric acid. The data show that when the content of the briquettes in the charge 30% of the maximum effect of improving corrosion resistance.

1. The method of producing briquettes to obtain titanium - and zirconium bearing cast iron, comprising preparing a mixture of starting material, followed by molding, characterized in that as starting material the use of crushed metal chips and metal waste in the form of dross and scrap of ferrous metals, mixed with cryolite, zircon and ilmenite concentrate, and as a binder impose a 40% aqueous solution of glyoxal, in the following ratio, wt.%:

metal chips and metal waste
in the form of dross and scrap of ferrous metals60
cryolite20
zircon concentrate7,5
ilmenite concentrate7,5
40% aqueous solution of glyoxal5

2. The method according to claim 1, characterized in that the resulting mixture is homogenized by stirring, formed into briquettes by means of pressing, which is then dried for 3 h at 80°C.



 

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