RU2465342C1 - Method for obtaining synthetic flux for metallurgical processes of cast-iron and steel making - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: fluorocarbon-containing wastes of electrolytic manufacture of aluminium with particle size of not more than 1 mm, calcium-containing component and water is mixed and agglomerated till material with particle size of 10-100 mm is obtained, and dried. Material containing active calcium oxide or forming it during cast-iron or steel making is used as calcium-containing component. Weight ratio of Ca:F in the mixture is maintained equal to 0.8-1.3. At that, fine fluorocarbon-containing wastes are used in the form of dust of electrostatic precipitators, or gas cleaning slurry, or flotation tailings of coal froth, or crushed waste carbon lining, or in the form of mixture of wastes with fluorine content of not less than 9 wt %. As calcium-containing component there supplied for mixing are solid wastes obtained as a result of manufacture of acetylene from calcium carbide, or material containing calcium carbonate or calcium hydroxide with particle size of not more than 1 mm.

EFFECT: obtaining of agglomerated synthetic flux of optimum component ratio with necessary and sufficient particle size and strength; improvement of reactive capability of the obtained flux and efficiency of its use.

7 cl, 4 tbl, 5 ex

Description

The invention relates to ferrous metallurgy, to the production of fluxes for smelting cast iron and steel.

The use of fluxes in the metallurgical redistribution of iron and steel is necessary to improve product quality. One of the ways to increase the technical and economic indicators of metallurgical processes is the use of industrial wastes in the fluxes.

Known complex synthetic fusible flux for the processes of ferrous metallurgy, consisting of 30-60% carbon, 5-30% calcium oxide, 25-65% fluorides of sodium, aluminum, calcium and magnesium, 0.5-5% of impurities, including . oxides of aluminum, iron, silicon, in the following ratio of elements in the composition of useful flux components without impurities: sodium: aluminum: calcium: magnesium - (5-15) :( 1-4) :( 5-20) :( 0,1- 1.0) (RF patent No. 2321641, C21B 3/02, 2008, [1]). The flux compositions used crushed spent lining of electrolytic cells and lime, as well as sludge for gas cleaning of electrolytic cells, crushed cinders of calcined anodes and suction dust from the lime kiln. This flux increased the slurry fluidity and ensured high refining ability. However, in the case of loading a flux containing lumpy materials, the processing time of the molten metal increases, it is quite difficult to maintain the ratio of elements in the composition of the useful components of the flux. In the case of using finely dispersed materials in the flux, the loss of components during loading and during use increases, the efficiency of flux application decreases.

A known method for producing complex synthetic fluxes for metallurgical processes of smelting cast iron and steel, comprising mixing fluorocarbon-containing waste from the electrolytic production of aluminum, additives and water, in which lime is used as additives, fluorocarbon waste from the electrolytic production of aluminum is crushed and / or sorted, mixed with water and lime with the following content of components, wt.%:

electrolytic fluorocarbon waste aluminum production 50-90 lime 4-20 water 6-30,

in this case, spent carbon lining of electrolyzers, dust and sludge from the gas treatment system of electrolyzers and suction devices can be used as fluorocarbon-containing wastes of aluminum electrolytic production, lime can be used in the form of lime-containing wastes with a particle size of 0.01-0.20 mm containing active calcium oxide ( CaO _act. ) 60-96% (RF patent No. 2354707, C21 B 3/02, 2009, [2]).

By purpose, technical nature, the presence of similar features, this solution is selected as the closest analogue. The addition of flux ensured the formation of a fluid slag melt and the production of highly active slag with a high refining ability. However, in order to ensure high efficiency when using this flux, it is necessary to additionally load lime both when loading raw materials and in the process of blowing cast iron, which leads to increased consumption of reagents due to dust and gas removal, to a decrease in technical and economic indicators.

The objectives of the proposed technical solution are to increase the technical and economic indicators of the processes of smelting pig iron and steel, improve the quality of products and reduce its cost.

The technical results are obtaining agglomerated flux of the optimal component composition with the necessary and sufficient size and strength, increasing the reactivity of the obtained flux and the effectiveness of its use.

Technical results are achieved by the fact that in the method for producing synthetic flux for metallurgical processes of smelting cast iron and steel, which involves mixing fluorocarbon-containing waste from the electrolytic production of aluminum, a calcium-containing component and water, finely dispersed fluorocarbon-containing waste with a particle size of not more than 1 mm is fed into the mixture as a calcium-containing component use a material containing active calcium oxide or forming it during the smelting of cast iron or steel, support in art the weight ratio Ca: F equal to 0.8 ÷ 1.3, and the resulting material okuskovyvayut mixture to give material with grain size of 10 ÷ 100 mm, and dried.

In addition, finely dispersed fluorocarbon-containing wastes with a fluorine content of at least 9% by weight can be used. in the form of dust from electrostatic precipitators, or gas cleaning sludge, or flotation tailings of coal foam, or crushed spent coal lining, or in the form of a mixture of waste with a different ratio of components, a calcium-containing component with a particle size of no more than 1 mm can be fed to the mixing, and as a calcium-containing component for mixing solid waste generated during the production of acetylene from calcium carbide, material containing calcium carbonate or calcium hydroxide can be supplied.

A comparative analysis of the proposed technical solution with the solution selected as the closest analogue shows the following.

The proposed solution and the solution for the closest analogue are characterized by similar features:

- obtaining synthetic flux for metallurgical processes of smelting cast iron and steel;

- mixing fluorocarbon-containing waste from the electrolytic production of aluminum, calcium-containing component and water;

- the use of reagents with a particle size of not more than 1 mm;

- the use of calcium-containing component containing active calcium oxide.

The proposed technical solution is also characterized by features that are different from the features characterizing the solution for the closest analogue:

- finely dispersed fluorocarbon-containing waste with a particle size of not more than 1 mm is fed to the mixing;

- as a calcium-containing component use a material containing active calcium oxide or forming it during the smelting of iron or steel;

- maintain in the mixture the weight ratio of Ca: F equal to 0.8 ÷ 1.3;

- the resulting material mixture agglomerate;

- the resulting mixture material is granulated to obtain material with a particle size of 10 ÷ 100 mm;

- agglomerated material with a particle size of 10 ÷ 100 mm is dried.

In addition, finely dispersed fluorocarbon-containing wastes with a fluorine content of at least 9% by weight can be used. in the form of dust from electrostatic precipitators, or gas treatment sludge, or flotation tailings of coal foam, or crushed spent coal lining, or in the form of a mixture of waste with a different ratio of components; for mixing, a calcium-containing component with a grain size of not more than 1 mm can be fed, and as a calcium-containing component for mixing, solid waste generated during the production of acetylene from calcium carbide, a material containing calcium carbonate or calcium hydroxide can be fed.

The presence in the proposed solution of signs other than those characterizing the solution according to the closest analogue allows us to conclude that the proposed solution meets the condition of patentability of the invention of “novelty”.

The technical essence of the proposed solution is as follows. To achieve high technical and economic indicators of the processes of smelting cast iron and steel in the proposed technical solution receive a flux in which during heat treatment synthesized calcium fluoride. The flux also contains an energy component in the form of carbon to intensify the flux treatment process. At the same time, the raw material for producing flux is man-made waste - fluorocarbon-containing waste from the electrolytic production of aluminum, and in some cases solid waste generated during the production of calcium carbide acetylene, which reduces the cost of synthetic flux. In addition, improving the consumer and technological properties of the flux product is achieved by maintaining the necessary and sufficient ratio of the components in the mixture to ensure the completeness of interaction between them during the use of the flux product, to obtain the active reagents necessary for the preparation of the flux (active calcium oxide), and when using it (active calcium fluoride). And to increase the reactivity of the components, reduce flux losses during transportation, overloads and during application, the material obtained after mixing is granulated to a particle size of 10-100 mm and dried to a residual moisture content of 1-3%.

The use of fluorocarbon-containing waste with a particle size of not more than 1 mm (and preferably a calcium-containing component with a particle size of not more than 1 mm) is due to the need to ensure good contact between the reagents, close packing of the reagents in the agglomerated material and the necessary and sufficient strength of the agglomerated material (within 50 ÷ 100 kg / cm ² ). In addition, fluorine losses in the gas phase are reduced due to a more complete reaction of sodium fluoroaluminates (cryolite, chiolite) with calcium oxide to form thermally stable calcium fluoride. When the fluorocarbon-containing waste is larger than 1 mm, the mechanical strength of the agglomerated material decreases, and its unproductive losses increase.

Maintaining a Ca: F ratio of 0.8 ÷ 1.3 in the mixture is due to the need for maximum binding of fluorine from cryolite (Na ₃ AlF ₆ ) and chiolite (Na ₅ Al ₃ F ₁₄ ) to calcium fluoride (CaF ₂ ) according to the reactions:

When the weight ratio of Ca: F is less than 0.8, part of the fluorine remains unbound in the thermally stable calcium fluoride, which leads to unreasonable losses of fluorine. With a weight ratio of Ca: F of more than 1.3, an unreasonable overspending of the calcium-containing component.

The resulting mixture is granulated to obtain material with a particle size of 10 ÷ 100 mm. When the size of the agglomerated material is less than 10 mm, the dust removal of synthetic flux increases when steel is obtained by blowing cast iron with oxygen, which increases the consumption of flux, and the gas permeability of the charge in the blast furnace process also deteriorates. When the size of the agglomerated material is more than 100 mm, the reaction time of the material with liquid metal and slag increases.

When the fluorine content in fluorocarbon-containing waste is less than 9.0%, the consumption of synthetic flux increases, and the efficiency of its use decreases.

The proposed parameters for producing agglomerated synthetic flux ensure its high quality in the content of refining and slag-forming components, the optimal carbon content for dissolving the flux in the slag melt.

It is preferable to use in the mixture as a calcium-containing component a material containing active calcium oxide or forming it during the smelting of iron or steel. This leads to the formation of active calcium fluoride, and therefore, increases the reactivity of the obtained flux and the effectiveness of its use.

A comparative analysis of the proposed technical solutions with other known solutions in this technical field and in related fields revealed the following.

1. It is known the combined use of pulverized waste from the production of aluminum and lime in the composition of slag-forming mixtures:

- slag-forming mixture contains, wt.%:

amorphous graphite 10-20 lime 20-30 ferrosilicon dusty waste 30-40 aluminum dust production 20-30

(RF patent No. 1702696, C21C 5/54, 1996, [3]);

- slag-forming mixture contains, wt.%:

aluminum gas cleaning dust 20.0-23.0 ferrosilicon dust cleaning gas 28.0-32.0 dust of gas purification lime production 20.0-24.0 graphite 3.0-8.0 ferrochrome self-decaying separated slag 18.0-24.0

(RF patent No. 2025197, C21C 5/54, 1994, [4]);

- slag-forming mixture contains, wt.%:

silica fume 36-40 aluminum dust production 19-23 pulverized waste of lime production 39-43

(RF patent No. 2356687, B22D 11/111, C21C 5/54, 2009, [5]).

2. It is known to use calcium-containing components for the extraction of fluorine from fluorine-containing compounds and its binding to thermally stable calcium fluoride:

- in the method of separating anhydrous sodium sulfate from working solutions of gas purification of aluminum electrolysis cells, including absorption of fluorine-containing gases from aluminum electrolysis with a soda solution, separation of secondary cryolite from lime gas treatment solution and lime caustification of the mother liquor of cryolite cooking, lime is dosed for caustification in an amount of 100 ÷ 110% active CaO of the stoichiometrically required for reaction with the soda and sodium fluoride mixed precipitate calcite CaCO ₃ and fluorite CaF ₂ is separated from the solution and was obtained th sulfate caustic solution is evaporated to a content of caustic Na ₂ O _ky = 150 ÷ 200 g / l with the release of anhydrous sodium sulfate (RF patent №2316473, C01D 5/00, 2008, at [6]);

- in the method for producing calcium fluoride mainly from solutions of cryolite production, including the treatment of fluorine-containing solutions with calcium hydroxide, the treatment of fluorine-containing solutions with calcium hydroxide is carried out at a mass ratio of Ca: F = (2-4): 1 (AS USSR No. 1747385, C01F 11 / 22, 7/54, 1992, [7]);

- in the method of removing fluorine from fluorine-containing solutions, including treating the solution with a calcium-containing reagent having a particle size of 5 ÷ 15 μm, the treatment is carried out at a ratio of reagents providing a mass ratio of calcium and fluorine equal to (1 ÷ 1.8): 1, as calcium-containing the reagent use calcium carbonate, which is preheated to 100 ÷ 400 ° C by pulse abrasion (RF patent No. 2042626, C01F 11/22, C01 33/10, 1995, [8]).

As a result of a comparative analysis of the proposed technical solution with other known solutions in this field and in related areas, no technical solutions were identified that are characterized by a combination of features similar to the proposed solution, the use of which allows achieving similar technical and technical and economic results. No technical solutions have been identified in which finely dispersed fluorocarbon-containing wastes with a particle size of not more than 1 mm are used for mixing, a material containing active calcium oxide or forming it during the smelting of iron or steel is used as a calcium-containing component, and the Ca: F ratio of 0.8 is maintained in the mixture -1.3, and the resulting material mixture is granulated to obtain material with a particle size of 10-100 mm, which is dried.

Based on the foregoing, it was concluded that the proposed technical solution meets the condition of patentability "inventive step".

The proposed method for producing synthetic flux for metallurgical processes of smelting cast iron and steel is implemented as follows.

Example 1

Comparison with the closest analogue.

Two batches of synthetic flux were manufactured according to the known and proposed technologies. In both cases, finely dispersed waste from the sludge field of an aluminum smelter with a fluorine content of 13.6% and carbon 55.7% was used as a fluorocarbon-containing material. As the calcium-containing material used:

- by known technology - lime-containing limestone calcining waste with CaO _act content _. = ~ 76.0%;

- according to the proposed technology - calcium-containing waste with a CaO content of ~ 75.7%, formed during the production of acetylene from calcium carbide by the reaction:

CaC ₂ + 2H ₂ O → C ₂ H ₂ ↑ + Ca (OH) ₂

The ratio of fluorocarbon-containing waste, calcium-containing material and water in the mixtures prepared according to the known and proposed technologies was, respectively,% weight: 70: 17.6: 12.4. In this case, the Ca: F ratio in the mixtures is close to ~ 1: 1.

According to the proposed technology, the prepared mixture was briquetted on a roller press into lentil briquettes of 60 × 40 × 40 mm in size and naturally dried to a residual moisture content of 1-3%.

The mixture obtained by known technology was dried naturally to a residual moisture content of 1-3%. At the same time, agglomerates of irregular shape with a size of several mm to 130 mm were obtained.

A batch of synthetic flux was used in converter steelmaking. The tests were carried out in 350-ton converters with overhead oxygen blast. Scrap metal, lime and synthetic flux were loaded into an empty converter. The lime additive regimen was the same for all heats: 30-50% of the total consumption was given to scrap before cast iron pouring, the rest in the first half of the purge.

Additive to the converter of synthetic flux was carried out according to the schedule: ~ 40% of the flux was fed into the filling, and the rest was planted during the purge. In all melts, the amount of flux loaded into the converter was the same and amounted to ~ 2.12 tons. Also, in all melts, the amount of scrap metal, temperature, composition and amount of molten iron, oxygen consumption, and the duration of oxygen purge were kept close.

Averaged initial data and experimental results are presented in table 1.

Table 1 Indicators Known technology Proposed technology The chemical composition of cast iron,% silicon 0.62 0.61 manganese 0.45 0.46 phosphorus 0.25 0.25 sulfur 0,028 0,027 Cast iron temperature, ° С 1395.0 1393.9 Consumption of materials for melting, t cast iron 245.5 246.0 scrap 103.1 102.9 lime 24.9 24.4 synthetic flux 2.12 2.12 Purge Duration, min 18.7 18.5 Oxygen consumption for purge, m ³ 18024 18013 The temperature of the metal after purging, ° C 1623.1 1630.5 The chemical composition of the metal after 0.11 0.09 purge%: carbon manganese 0.11 0.12 phosphorus 0,021 0.019 sulfur 0,022 0,020 The degree of dephosphorization,% 91.6 93.6 The degree of desulfurization,% 20,2 25.3 The chemical composition of the slag,%: CaO 50.55 51.13 SiO ₂ 17.74 18.13 FeO _total 20.7 18.6 CaO / SiO ₂ 2.85 2.82

Comparison with the closest analogue showed that the proposed technical solution provides higher rates of dephosphorization (93.6% versus 91.6%), desulfurization (25.3% versus 20.2%), residual FeO content _total. in slag (18.6% versus 20.7%) and metal temperature after purging (1630.5 versus 1623.1 ° С).

Example 2

Justification of particle size of fluorocarbon-containing waste.

We prepared 3 batches of briquettes by mixing wet fluorocarbon-containing wastes (dust from electrostatic precipitators, gas treatment sludge, crushed spent coal lining) with a fluorine content of 16% by weight. and a calcium-containing component based on the decomposition product of calcium carbide with water, followed by pressing into cylindrical samples with a diameter of ~ 60 mm and a height of ~ 60 mm. The content of fluorocarbon-containing waste and calcium-containing component in the briquettes was 75% and 25%, respectively. The batches of briquettes differed in the granulometric composition of fluorocarbon-containing wastes and a calcium-containing component.

Dried briquettes were tested on:

- ultimate compressive strength;

- loss of fluorine in the gas phase as a result of burning briquettes at 1100 ° C for 1 hour

Initial data and experimental results are presented in table 2.

table 2 No. Particle size, mm Weight ratio Ca: F in briquettes The limit of compressive strength, kg / cm ² Loss of fluorine,% weight. (abs.) Fluorocarbon Holding waste Calcium Holding comp. one 100% less than 1.0 CaO less than 2.0 1,0 55,4 0.39 2 100% less than 1.0 CaO less than 1.0 1,0 63.3 0.35 3 100% less than 2.0 CaO less than 1.0 1,0 47.2 0.52

From the results shown in table 2, it follows that with increasing particle size of fluorocarbon-containing waste particles, the mechanical strength of the briquettes decreases and the loss of fluorine in the gas phase increases. This leads to an increase in the specific (per 1 ton of metal) consumption of synthetic flux. Moreover, it is preferable to use a calcium-containing component with a particle size of less than 1.0 mm

Example 3

The rationale for the optimal weight ratio of Ca: F in the mixture.

We prepared 5 batches of briquettes by mixing wet fluorocarbon-containing wastes (dust of electrostatic precipitators, gas treatment sludge, crushed spent coal lining) with a fluorine content of 15% by weight. and a calcium-containing component based on lime dusting followed by pressing into cylindrical samples with a diameter of ~ 60 mm and a height of ~ 60 mm. The batch of briquettes differed in the weight ratio Ca: F in the mixture.

The dried briquettes were calcined in air at 1100 ° С for 1 h. The cooled briquettes were weighed and analyzed for fluorine content. The results of the analysis determined the loss of fluorine in the gas phase.

The initial data and the results of the experiments are presented in table 3.

Table 3 No. Particle size, mm Weight ratio Ca: F in briquettes Loss of fluorine,% wt. (Abs.) Fluorocarbon Holding waste Calcium-containing. component one 100% less than 1.0 CaO less than 1.0 0.7 0.77 2 0.8 0.55 3 1,0 0.41 four 1.3 0.39 5 1.4 0.38

From the results shown in table 3, it follows that the optimal weight ratio of Ca: F in the mixture is in the range of 0.8-1.3. When the weight ratio of Ca: F in the mixture is less than 0.8, the absolute loss of fluorine increases by 1.4-1.9 times. With an increase in the weight ratio of Ca: F in the mixture of more than 1.3, an unproductive consumption of calcium-containing reagent is observed.

Example 4

Justification of the optimal size of the agglomerated synthetic flux.

An industrial batch of synthetic flux pellets was manufactured in a drum granulator from finely dispersed fluorocarbon-containing aluminum waste (dust from electrostatic precipitators, gas cleaning sludge, coal foam flotation tailings, crushed spent coal lining) with a fluorine content of 13% by weight. and a calcium-containing component based on a mixture consisting of a decomposition product of calcium carbide with water and limestone. The obtained pellets were dried and scattered into 5 fractions:

-10 mm;

+10 mm - 25 mm;

+25 mm - 50 mm;

+50 mm - 100 mm;

+100 mm - 120 mm.

From the obtained fractions, 3 batches of pellets of synthetic flux were formed: lot 1: - 10% of the fractions (- 10 mm) and 90% of the fractions (+10 mm - 100 mm);

batch 2 - 100% of the fractions (+10 mm - 100 mm);

batch of 3 - 90% of fractions (+10 mm - 100 mm) and 10% of fractions (+100 mm - 120 mm).

Batches of pellets were used in converter steelmaking as a thinner of metallurgical slag. The tests were carried out in 350-ton converters with overhead oxygen blast. Scrap metal, lime and synthetic flux were loaded into an empty converter. The lime additive regimen was the same for all heats: 30-50% of the total consumption was given to scrap before casting iron, and the rest in the first half of the purge.

The fractional batches of synthetic flux in the form of pellets were added to the converter during the experimental melting according to an identical schedule: 40% of the flux was fed into the filling, and the rest was planted during the purge. In all heats, the amount of flux loaded into the converter was the same and amounted to ~ 2.07-2.08 tons. Also in all heats, the same was maintained: amount of scrap, temperature, composition and amount of molten iron, oxygen consumption, duration of blowing.

Averaged initial data and experimental results are presented in table 4.

Table 4 Indicators Party 1 Party 2 Party 3 The chemical composition of cast iron,% silicon 0.59 0.60 0.59 manganese 0.56 0.53 0.54 phosphorus 0.27 0.28 0.26 sulfur 0,0205 0.0210 0,0207 Cast iron temperature, ° С 1376.3 1365.9 1380.0 Consumption of materials for melting, t cast iron 246.1 250,0 247.7 scrap 105.8 102.9 103.0 lime 23.7 24.1 23.5 synthetic flux 2.07 2.07 2.08 Purge Duration, min 19.18 19.75 19.83 Oxygen consumption for purge, m ³ 18113 18164 18157 The temperature of the metal after purging, ° C 1620.1 1623.3 1623.0 The chemical composition of the metal after purging,%: carbon 0,098 0,100 0,111 manganese 0.13 0.12 0.13 phosphorus 0,0296 0,0218 0,0238 sulfur 0.0175 0.0160 0.0160 The degree of dephosphorization,% 89.04 92.2 90.45 The degree of desulfurization,% 14.75 23.84 22.55 The chemical composition of the slag,%: CaO 48.05 48.13 48.3 SiO ₂ 15.74 16.13 15.9 FeO _total 21.8 19.1 20.6 CaO / SiO ₂ 3.05 2.98 3.04

Under identical conditions for industrial melting using synthetic flux of different particle size distribution, the following results were obtained:

1. The best indicators for the degree of dephosphorization (92.2%), desulfurization (23.84%), residual FeO content _total. in slag (19.1%) and metal temperature after purging (1623.3 ° C) were obtained using flux from batch 2, 100% of the granules of which have a size of 10 to 100 mm.

2. When using party 1 with the content of a small fraction of flux (-10 mm), the decrease in technical and economic indicators occurred as a result of dust removal of small granules of flux by an oxygen stream during purging.

3. When using party 3 with the content of a large flux fraction (-100 + 120 mm), the decrease in technical and economic indicators occurred as a result of incomplete interaction of large flux briquettes with molten slag and metal.

Example 5

Testing synthetic flux in a blast furnace process.

A batch of synthetic flux was produced using the proposed technology. Finely dispersed waste from the sludge field of an aluminum smelter with a fluorine content of 14.2% and carbon 53.6% was used as a fluorocarbon-containing material. As a calcium-containing material, calcium-containing wastes with a CaO content of ~ 75.7%, formed during the production of acetylene from calcium carbide, were used. The Ca: F ratio in the mixtures was ~ 1: 1.

The prepared mixture was briquetted on a roller press into lentil briquettes 60 × 40 × 40 mm in size and naturally dried to a residual moisture content of 1-3%.

The resulting briquettes of synthetic flux were introduced into the composition of the blast furnace charge. The flux consumption was 5.5 kg / t of molten iron. As a result of the melting obtained: cast iron composition,% weight .: Si = 0.61; Mn = 0.45; P = 0.23; S = 0.019; and slag composition,% weight .: SiO ₂ = 29.85%; CaO = 40.11; Al ₂ O ₃ = 17.23; MgO = 9.95; FeO = 0.23; S = 0.45. The basicity of the slag CaO: SiO ₂ = 1.34.

The use of synthetic flux improved the fluidity of blast furnace slag, its desulfurizing ability and good drainage ability of the furnace.

Thus, the proposed method for producing synthetic flux for metallurgical processes of steel and cast iron smelting allows to obtain agglomerated synthetic fluxes with high refining and slag-forming ability, providing an optimal temperature regime of slag formation with improved technical and economic indicators.

INFORMATION SOURCES

1. RF patent №2321641, С21В 3/02, 2008

2. RF patent No. 2354707, C21B 3/02, 2009

3. RF patent No. 1702696, C21C 5/54, 1996

4. RF patent No. 2025197, C21C 5/54, 1994

5. RF patent No. 2356687, B22D 11/111, C21C 5/54, 2009

6. RF patent No. 2316473, C01D 5/00, 2008

7. A.S. USSR No. 1747385, C01F 11/22, 7/54, 1992

8. RF patent No. 2042626, C01F 11/22, C01 B 33/10, 1995

Claims (7)

1. A method of producing a synthetic flux for metallurgical processes of smelting cast iron and steel, comprising mixing fluorocarbon-containing wastes of electrolytic production of aluminum, a calcium-containing component and water, characterized in that finely dispersed fluorocarbon-containing wastes with a particle size of not more than 1 mm are used for mixing, the calcium-containing component is used material containing active calcium oxide or forming it during the smelting of cast iron or steel, maintain the weight ratio in the mixture ue Ca: F equal to 0.8-1.3, and the resulting mixture material to obtain material okuskovyvayut grain size of 10-100 mm, and dried. 2. The method according to claim 1, characterized in that they use finely dispersed fluorocarbon-containing waste with a fluorine content of at least 9 wt.%. 3. The method according to claim 1, characterized in that finely dispersed fluorocarbon-containing wastes are used in the form of dust from electrostatic precipitators, or gas treatment sludge, or coal foam flotation tailings, or crushed spent coal lining, or as a waste mixture with a different ratio of components. 4. The method according to claim 1, characterized in that a calcium-containing component with a particle size of not more than 1 mm is supplied for mixing. 5. The method according to claim 1, characterized in that as the calcium-containing component for mixing serves solid waste generated during the production of acetylene from calcium carbide. 6. The method according to claim 1, characterized in that as a calcium-containing component for mixing serves a material containing calcium carbonate. 7. The method according to claim 1, characterized in that as a calcium-containing component for mixing serves a material containing calcium hydroxide.