EA037174B1 - Method for preparation of flux based on secondary aluminum-containing slag - Google Patents

Abstract

The invention relates to the field of iron and steel industry, to processing of secondary aluminum-containing slag, and can be used for production of various steel grades. The technical result is achieved when using the invention as involving the newly formed waste of salt aluminum-containing slag into production processes for flux preparation in iron and steel industry, at the expense of slag dumps removal. The essence of this invention is expressed as a new set of features in the method of flux preparation for ladle DE oxidation of steelmaking slag based on secondary aluminum-containing slag, including metallic acid-soluble aluminum, aluminum oxide, potassium and sodium oxides, silicon and ferric oxides. According to the invention, the above-listed components for flux are preliminarily hydrated to obtain water-soluble aluminates and water-soluble alkalis; water-soluble chlorides and alkalis are leached out by washing with water; high-temperature drying is carried out at 400-500°C to remove crystallization water associated in oxides to reach a humidity of 1.5% as maximum; then cooling, crushing and grading into grain size are carried out; magnesium oxide and lime (CaO) as a calcinated dolomite are further added to the dried and graded flux product; prior to packing, barium-strontium carbonate BSK-2 is added according to the grain size, to the dried and graded flux product in the amount of 1.0 to 15 wt.%.

Description

(54) METHOD FOR PREPARING FLUX BASED ON SECONDARY ALUMINUM SLAG

037174 Bl

(43) 2020.01.31 (56) RU-C1-2449032 (96) 2018 / ЕА / 0061 (BY) 2018.07.24 RU-C1-2547379 RU-C1-2396364 (71) (73) Applicant and patentee: ES-A1-2144896 BELARUSIAN NATIONAL TECHNICAL UNIVERSITY (BY) (72) Inventor: Nemenenok Boleslav Mecheslavovich, Tribushevsky Leonid Vladimirovich, Sheinert Viktor Alexandrovich (BY) US-A-5669957

(57) The invention relates to the field of ferrous metallurgy, to the processing of secondary aluminum-containing slags, and can be used in the production of various grades of steel. The technical result is manifested when using the invention in the form of involving the newly formed wastes of saline aluminum-containing slag in the production processes of preparing flux in ferrous metallurgy due to the elimination of slag dumps. The essence of the invention is expressed by a new set of features in a method for preparing a flux for deoxidation in a ladle of steelmaking slag based on a secondary aluminum-containing slag including acid-soluble metal aluminum, aluminum oxide, potassium and sodium oxides, silicon and iron oxides, according to the invention, the above components for the flux are pre-hydrated to obtain water-soluble aluminates and water-soluble alkalis, leach water-soluble chlorides and alkalis by washing them with water, carry out high-temperature drying at 400-500 ° C to remove crystallization water bound in oxides to a moisture content of no more than 1.5%, cool, grind, disperse into fractions, magnesium oxide and lime (CaO) in the form of burnt dolomite are additionally introduced into the dried and dispersed flux product, while barium carbonate - strontium BSK-2 is additionally introduced into the dried and dispersed flux product before filling according to the size in an amount from 1.0 to 15 wt%.

037174 B1

The invention relates to the field of ferrous metallurgy, in particular to secondary metallurgy of aluminum, namely to the processing of secondary aluminum-containing slags, depleted by a metallurgical method, and can be used in the production of various grades of steel, for slag deoxidation, refining, modification and alloying as in out-of-furnace steel processing and during the casting process.

According to official statistics, about four million tons of white aluminum-containing slags with a low content of salts or their complete absence and about five million tons of so-called black or salt waste slags are formed annually in the world. A significant part of the salt slag is annually disposed of and disposed of. In open burial, slags decompose under the influence of atmospheric precipitation, emitting toxic gases. Salts of sodium, potassium and heavy metals are gradually washed out by rain and melt water, getting into the soil, polluting it and groundwater. Particularly dangerous is the finely dispersed dust fraction of slags, sprayed by air streams for tens of kilometers around the dumps, polluting water bodies, the atmosphere, soil, harming human health.

Slag containing aluminum is formed in the production of primary aluminum, in the manufacture of aluminum alloys and the manufacture of products from them, as well as in the processing of scrap and waste aluminum.

From the prior art, fluxes based on aluminum-containing slags are known for deoxidizing, refining, modifying and alloying steel.

In metallurgy, aluminum-containing slags of aluminum production are used as a flux. A flux based on these slags for deoxidation in a ladle of steelmaking slag is prepared from components containing, wt%: aluminum 1.0-60.0, aluminum oxides 1.0-50.0, and calcium oxide 0.28-1, 0, magnesium oxide 1.0-10.0, iron oxide 1.0-9.0, silicon oxide 1.0-16.0, copper oxide 0.1-10.0, manganese oxide 0.1-2, 0, zinc oxide 0.2-12.0, lead oxide 0.01-0.15, nickel oxide 0.01-0.15, chromium oxide 0.05-0.5, sodium chlorides 0.1-40, 0, potassium chlorides 0.1-40.0. The flux can be made in the form of any agreed fraction, in lumpy form with a fraction of 10-500 mm or in the form of a briquette with dimensions of 10-120 mm, obtained by pressing or sintering slag screenings with a fraction of -2 mm. [1]

The invention will improve the quality of steel, reduce its cost, reduce the anthropogenic impact on the atmosphere, soil and groundwater by using in the technological processes of ferrous metallurgy both newly formed aluminum slag and extracted from existing dumps and burials.

Known exothermic flux mixture for deoxidizing, refining, modifying and alloying steel, described in the patent. The known mixture contains aluminum, aluminum oxides, oxides of calcium, magnesium, iron, copper, titanium, manganese and sodium and / or potassium. [2]

Slag of aluminum production, after being drained from the furnace, cooling and determining the chemical composition, is subjected to crushing and separation. Slag with a fraction of 10-500 mm can be used as a flux in lumpy form. The fine fraction (screenings with a fraction of -2 mm) is sintered or pressed to obtain briquettes with dimensions of 10-120 mm.

The ratio of components in a known briquette, wt%: aluminum 5.0-83, aluminum oxide 2.5-75, calcium oxide 0.5-10, magnesium oxide no more than 8, iron oxide no more than 15, copper oxide no more than 2 , titanium oxide no more than 7, manganese oxide no more than 12, sodium and / or potassium oxides 5-7.

The disadvantage of the known flux mixture should be considered the laboriousness and high cost of manufacturing, additional costs for sintering.

Following the well-known technological regulations, dump slags are processed into fluxes.

The closest analogue of the invention is a method of preparing a flux for deoxidation in a ladle of steelmaking slag with secondary aluminum by complex hydrometallurgical processing of poor saline alumina-containing slag, including metallic aluminum Al, aluminum oxide Al ₂ O ₃ , calcium oxide CaO, magnesium oxide MgO, iron oxide Fe ₂ O ₃ , oxides K ₂ O + Na ₂ O, consisting in its grinding, leaching in water, evaporation of brine or enrichment of brine using ion exchange or membrane technologies, followed by drying of the liberated salts and drying of the oxide component insoluble in water, from which a small amount is released beads of aluminum. The rest of the oxide component goes for further processing or for disposal (complex processing of saline aluminum-containing slag). [3]

The disadvantages of this method are its high energy consumption, multi-stage process, negative profitability and the impossibility of extracting dispersed aluminum, which is oxidized in contact with water.

The technical problem to be solved by the invention is to create an object, the characteristics of which meet the specified requirements and its ecology.

The technical problem is implemented by a technical result that defines a new property that improves the technical characteristics, which are manifested when using the invention in the form of involving the newly formed waste of saline aluminum-containing slag in the production processes of preparing flux in ferrous metallurgy, reducing its cost by full or partial

- 1,037174 replacement of standard expensive deoxidizers and ligatures with flux for deoxidation, refining, modification and alloying of steel and reduction of anthropogenic impact on the atmosphere, soil and groundwater by eliminating slag dumps.

The essence of the invention is expressed by a new set of features necessary and sufficient for the implementation of the invention with the achievement of the specified technical result, and is implemented in that the method for preparing a flux based on a secondary aluminum-containing slag, including acid-soluble metal metal, aluminum oxide, potassium and sodium oxides, silicon oxides and iron, according to the invention, the above components for the flux are pre-hydrated to obtain water-soluble aluminates and water-soluble alkalis, water-soluble chlorides and alkalis are leached by washing them with water, high-temperature drying is carried out at 400-500 ° C to remove crystallization water bound in oxides to a moisture content of no more than 1.5%, cooled, ground, dispersed into fractions, magnesium oxide and lime (CaO) are additionally introduced into the dried and dispersed flux product in the form of burnt dolomite at the following ratio of components, wt%:

A1 ₂ OZ 25.0-70.0 Al metallic acid soluble 5.0-25.0 (KgO + KagO) mass impurity - fraction 1.0-8.0 impurity S1O2, 4.0-10.0 impurity PerO3 5.0-10.0 CaO 1.0-20.0 MgO 1.0-20.0

and stocked.

The method is technologically advanced so that barium carbonate - strontium BSK-2 from 1.0 to 15.0 wt.% Of the agreed size with the mass fraction of the main chemical elements of oxides,% would be additionally introduced into the dried and dispersed flux product:

Bao 28.4 SrO 21.5 CaO 1.0-16.0 MgO 1.0-18.0 associated impurities rest

In the method, it is possible that the components of the secondary aluminum-containing slag for the flux are hydrated by placing-dumping on a waterproof base inclined to the horizon in the form of erected line collars, the adjacent ones form a system of drainage parallel drains, hydraulically interconnected by a collecting manifold, which is by means of two gate The valves are respectively connected by channels with two autonomous pond collectors, one of which is designed to collect the hydration salt brine, and the other is an evaporator of the hydration brine, while the pond collectors are equipped with a movable ventilated roof damper, the area of which is proportional to the area of the pond collector.

The technical effect is manifested in an increase in the efficiency of the processes of removing sulfur from steel and its desulfurization during the production of steel from the steel-making unit into the steel-pouring ladle.

The essence of the invention is implemented on the best example of preparing a flux for slag deoxidation in a distributing ladle of a steelmaking unit.

Slag containing aluminum is formed in the production of primary aluminum, in the manufacture of aluminum alloys and the manufacture of products from them, as well as in the processing of scrap and waste aluminum. The slag obtained in different industries and at different enterprises differs in the content of aluminum, aluminum oxide. Slags typically contain from 5 to 60% aluminum in various forms, from free metal to oxides. The richest in the percentage of aluminum are the so-called bursts and stripping, formed during the smelting of aluminum in reverberatory furnaces.

An example of the implementation of the method for the preparation of flux and its application.

The method of preparing a flux for deoxidation in a ladle of steelmaking slag based on secondary aluminum-containing slag, including metal acid-soluble aluminum, aluminum oxide, potassium and sodium oxides, silicon and iron oxides, was carried out in accordance with TU BY 700028768.003-2008.

According to the invention, the above components for the flux are pre-hydrated to obtain water-soluble aluminates and water-soluble alkalis, water-soluble chlorides and alkalis are leached by washing them with water.

The components of the secondary aluminum-containing slag for flux are hydrated by placing - 2 037174 dumps on a waterproof base inclined to the horizon in the form of erected line collars, the adjacent ones form a system of drainage parallel drains, hydraulically interconnected by a collecting manifold, which is respectively connected by means of two gate valves channels with two autonomous pond collectors, one of which is designed to collect hydration brine, and the other is an evaporator of hydration brine, while the pond collectors are equipped with a movable ventilated roof damper, the area of which is proportional to the area of the pond collector.

For hydration leaching of slags before they go to the processing of fluxes, a special geomembrane made of high-density polyethylene is used as reinforcement of the base waterproofing, which has excellent resistance to chemicals, has high strength and durability. It is laid on the base and can withstand strong mechanical stresses and allows you to shield the contents of the secondary aluminum sludge from the environment. [four]

In the process of atmospheric hydration of the components of the aluminum-containing slag, produced in a time interval equal to two to four annual rainy seasons: autumn-spring-autumn-spring, water-soluble chlorides and alkalis through a system of drainage parallel drains and two slide gates, respectively, enter two autonomous pond collectors for collection brine hydration. By means of a movable ventilated roof damper, the area of which is proportional to the area of the pond collector, which is filled with the hydration salt brine, the process of evaporation of the latter is carried out to a moisture content consistent with the technical conditions of high-temperature drying. After the operation of evaporation, the necessary saturation and evaporation on the crystal, the obtained intermediate product of the solid flux phase is removed from this pond collector and high-temperature drying is carried out at 400-500 ° C to remove crystallization water bound in oxides to a moisture content of no more than 1.5%. Saline brine is supplied to the pond collector freed from the semi-product by opening the slide gate.

In this case, the movable ventilated roof damper is pushed onto the second pond collector of the pond collector, which is filled with hydration salt brine, and the salt brine evaporation process is carried out in it in the same way as in the first pond collector to a moisture content consistent with the technical conditions of high-temperature drying. The above-described technology of evaporation of saline brine of aluminum-containing slag is carried out by alternately blocking one or another pond collector with a roof damper as required by production.

After high-temperature drying at 400-500 ° C, the flux intermediate is cooled, ground, scattered into fractions, magnesium oxide and lime (CaO) are additionally introduced into the dried and dispersed flux product in the form of burnt dolomite at the following ratio of components, wt%:

A1 ₂ O ₃ 30.0-70.0 A1 metal acid soluble 5.0-25.0 (К ₂ О + Na ₂ O) mass impurity - fraction 1.0-8.0 impurity SiO ₂ , 4.0-10.0 impurity Fe ₂ O ₃ 5.0-10.0 CaO 1.0-20.0 MgO 1.0-20.0

humidity not more than 1.5% and are packed.

In the method, before packing, depending on the composition and technological route of casting steel onto a bloom or slab, barium carbonate - strontium BSK-2 is additionally introduced into the dried and dispersed formulation of the flux product described above from 1.0 to 15.0 wt.% Of the agreed size with the mass fraction basic chemical elements of oxides,%:

The flux obtained according to the invention was realized at BMZ when processing steel at the outlet from a 100-ton electric arc furnace. After tapping the melt from the furnace into the ladle, the steel was poured into the continuous casting machine. Lime and coke were added to the liquid slag. It has been experimentally established that when the amount of furnace slag is 2-4% of the melt weight, it is necessary to add coke in an amount of 0.10-0.30 kg per ton of steel and lime up to 5 kg per ton of steel. Moreover, the coke additive less than the declared limit slightly increases the oxidation of the slag (the content of FeO and MnO), and the excess contributes to carbon

- 3 037174 for the living of steel. The APC additive was added in portions of 20-40 kg at a total consumption of 60-120 kg per melt. The color of the slag in the steel ladle during treatment, depending on oxidation (the sum of oxides FeO and MnO), changed from black to light gray and white. The content of alumina in the slag immediately after the APC additive averaged 17%, but upon further processing of the alloy during the addition of slag-forming agents it decreased to 13%. At the same time, the content of iron and manganese oxides decreased from 2.25% at the beginning of deoxidation to 1.37% at the end. After the treatment of the slag with APC, an increase in its fluidity was visually noted, which reached a maximum with the addition of 100 or more kilograms of the test material. At the same time, there was no deterioration in the castability of steel on the test heats. In ladle metallurgy, all processes with the participation of an active element (aluminum) do not proceed in isolation from one another, not in isolation, but jointly and most often simultaneously, that is, they are combined both in space and in time. The introduction of lime within the specified limits increases the basicity of the slag, increasing its desulfurizing and refining capacity. Higher lime additives significantly cool the slag and thicken it. In this regard, the refining properties of the slag are reduced, and the energy consumption for melting the slag increases. An increase in the content of liquid slag of more than 4%, due to large volumes of slag, leads to an increase in operating costs, and a decrease of less than 2% due to small volumes of slag poorly cleans steel from non-metallic inclusions and lowers the degree of desulfurization.

In agreement with the technical conditions of steel smelting, barium carbonate - strontium BSK-2 from 1.0 to 15.0 wt.% Of the agreed size with the mass fraction of the main chemical elements,%: oxides BaO- 28.4, SrO-21.5, CaO-16.0, MgO-18.0, CO2-5.5. [five]

Of particular interest is the role of barium in improving the mechanical properties of the alloy. The beneficial effects of alkaline earth metals on the metallurgical process and properties of metals are well known. Calcium, strontium and barium, due to their chemical activity, have a high affinity for oxygen and most of its compounds. According to the literature data, their deoxidizing ability decreases in the sequence Сα> Sr> Mg> Ba. Since the sizes of barium and strontium atoms significantly exceed the sizes of iron atoms, solid solutions of barium with iron are impossible. Being an active graphitizer, barium promotes the formation of a large number of graphitization centers, reduces the amount of active carbon in the alloy, evens out the chemical heterogeneity of castings, increases the isotropy of their properties, and improves machinability. Steel deoxidized by BSK-2 contains an insignificant amount of oxygen. In the process of deoxidation and crystallization of steel, aluminum nitrides (AIN) are formed, which reduce the harmful effect of nitrogen, increasing its desulfurizing and refining ability.

Following the technological regulations, experimental studies were carried out on processed and dump slags, summarized in table. one.

Table 1

Item No. Ingredients composition, wt% Structure mass% Result/ Declared METHOD Result/ PROTOTYPE one 2 3 four five PROTOTYPE (briquette) desulfurizing desulfurizing 2 wt%: aluminum A1 5.0-83 ability ability aluminum oxide A1 ₂ Oz 2.5-75 slag slag 40 - 45% calcium oxide CaO 0.5-10 for solid for solid magnesium oxide MgO up to 8.0 slag-forming slag-forming iron oxide Fe ₂ 0z up to 15.0 their mixtures their mixtures oxides K ₂ O + Na ₂ O 5.0 one 2 3 four five COMPOSITIONS OF THE INVENTION 3 A1 ₂ 0z A1-metal. acid soluble 70.0 5.0 desulfurizing ability of slag up to 80% desulfurizing ability

- 4 037174

(K ₂ O + Na ₂ O) mass impurity - fraction of SiO ₂ impurity, _{Fe 2} O 3 CaO impurity MgO BSK-2 4.0 5.0 1.0 3.5 7.0 3.5 / 100 slag 40 45% for solid slag-forming mixtures four AI2O3 A1-metal. acid-soluble (K ₂ O + Na ₂ O) mass, impurity, proportion of SiO ₂ impurity, _{Fe 2} O 3 CaO impurity, BSK-2 35.0 12.0 4.0 5.0 5.0 10.0 20.0-25 9.0 / 100 80-85% five A1 ₂ 0z A1-metal. acid-soluble (К ₂ О + Ma ₂ О) mass, impurity, fraction of impurity S1O2, impurity _{Fe 2} O 3 CaO MgO BSK-2 31.0 15.0 4.0 10.0 10.0 19.0 1.0-50 10.0 / 100 up to 87% 6 A1 ₂ Oz A1-metal. acid-soluble (K ₂ O + Na ₂ O) mass, impurity, proportion of SiO ₂ impurities, impurity of Fegos CaO MgO BSK-2 25.0 25.0 8.0 1.0 1.0 6.0 19.0-50 15.0 / 100 up to 90% Interval values 6 A1 ₂ 0z Al-metal. acid-soluble (K ₂ O + Na ₂ O) mass impurity - fraction of SiO ₂ impurity, Fegoz CaO impurity MgO BSK-2 84.0 4.5 0.9 3.5-10.0 4.8-10.0 0.9 0.9-1.5 0.5 up to 45% 7 A1 ₂ 0z A1-metal. acid-soluble (K ₂ O + Na ₂ O) mass. impurity is an impurity-share SiO _2, Be impurity Oz ₂ CaO MgO SBR-2 5.0 6.0 9.0 11.0 11.0 21.0 21.0 16.0 up to 70%

The tests of the obtained flux showed that the desulfurizing ability of the slag when using the flux formulation according to the invention is almost twice as high as the prototype.

As follows from the experimental data given in table. 1, the proposed composition is superior to the prototype and the prior art.

At RUE Belarusian Metallurgical Plant, pilot tests were carried out on the basis of the obtained flux of an aluminum-containing deoxidizing mixture (ARS) based on waste of metallurgical processing of secondary aluminum. The material was used in the out-of-furnace treatment of the entire steel assortment being melted, with the exception of cord grades, for slag deoxidation instead of the standard aluminum-based deoxidizer.

The APC was added immediately after the melt was discharged from an arc steelmaking furnace with a capacity of 100 tons to a metal finishing unit or to a ladle furnace. The carburizing agent and ferroalloys were fed after slag deoxidation. APC was added in portions of 20-40 kg at a total consumption of 60-120 kg per melt. During the treatment, depending on the oxidation (the sum of the oxides FeO and MnO), the color of the steel ladle slag changed from black to light gray and white. Alumina content immediately after APC additive

- 5,037174 in the slag was relatively high (on average 17.27%), but with further processing of the melt, during the addition of slag-forming, it decreased on average to 13.38%. At the same time, the content of iron and manganese oxides also decreased from 2.25% at the beginning of treatment to 1.37% at the end. After the addition of APC, an increase in slag fluidity was visually observed, which reached a maximum with the introduction of 100 kg or more of the test material. At the same time, the castability of steel on test heats did not deteriorate. The degree of desulfurization of steel treated with APC was in the range of 23.9-61.1% and averaged 38.7%. The degree of desulfurization of comparative heats using a standard deoxidizer varied in the range 17.0-57.1% and averaged 35.5%. With the APC additive, moderate gas emission was observed, dust emission was absent.

As a result of the tests, it was found that the technological parameters of melts using ARS (degree of steel desulfurization, slag fluidity, metal pouring) are comparable to melts treated with a standard deoxidizer. The indicators of the product range are summarized in table. 2.

table 2

Key product indicators

Assortment -> Aluminum deoxidizing mixture ARS-1 Aluminum deoxidizing mixture АРС2 Catalog code -> 64341 64342 Mass fraction of potassium and sodium oxides,% 8 8 Mass fraction of metallic aluminum (acid-soluble),% twenty twenty Mass fraction of total carbon,% 6 6 Mass fraction of oxide aluminum,% 50.0 30.0 Mass fraction of silicon oxide,% ten ten Mass fraction of iron oxide,% ten ten Mass fraction of particles with a size of 0-30 mm,% 80 80 Mass fraction of particles with a size of 30-50 mm,% twenty twenty

The use of the invention makes it possible to increase the efficiency of desulfurization of steel when it is released from the steelmaking unit up to 2 times. The use of waste from the secondary metallurgical processing of aluminum for the deoxidation of steel-making slags will make it possible to create a waste-free production for the disposal of aluminum slag and shavings;

avoid burial of III-IV hazard class waste, which will have a beneficial effect on the environment;

reduce the cost of steel production, since the cost of deoxidizing mixtures based on waste is less than standard deoxidizers.

The use of a new method of manufacturing flux made it possible to reduce the cost of steel due to the reuse of aluminum-containing slag and a decrease in energy costs for its melting (energy savings amounted to 2 kWh / t of steel);

increase the purity of steel for non-metallic inclusions by increasing the rate of slag formation;

increase the desulfurizing ability of slag up to 80% (versus 40-45% when using solid slag-forming mixtures and 60-80% when using liquid synthetic slags).

The use of the proposed method of processing steel also made it possible to reduce the cost of steel by reusing the slag and reducing the energy costs for its melting (energy savings amounted to 2 kWh / t of steel);

increase the purity of steel for non-metallic inclusions by increasing the rate of slag formation;

increase the desulfurizing ability of slag up to 80% (versus 40-45% when using solid slag-forming mixtures and 60-80% when using liquid synthetic slags).

As follows from the experimental data given in table. 2, the proposed composition is superior to the prototype and the prior art.

Sources of information.

1. RU 2396364, MPKS22V 9/10, C22V 9/10, publ. 10.08.2010.

2. RU 2252265 C1, cl. С21С 7/06, publ. 05/20/2005.

3. Text-monograph / S.D. Kutsenko, L.N. Kurdyumova, N.V. Kubatkina, Oryol: Orel State Technical University, 2007, 171 p.

4. New generation polygons ES EasyPagedvorak-engineering.com, Internet, 20/02/2018.

5.TU 1717-001-57693655-2001.

Claims (2)

one . A method for preparing a flux based on a secondary aluminum-containing slag including acid-soluble metal aluminum, aluminum oxide, potassium and sodium oxides, silicon and iron oxides, characterized in that the above components for the flux are pre-hydrated to obtain water-soluble aluminates and water-soluble alkalis, water-soluble chlorides and alkalis are leached by washing them with water, high-temperature drying is carried out at 400-500 ° C to remove crystallization water bound in oxides to a moisture content of not more than 1.5%, cooled, grinded, scattered into fractions, magnesium oxide is additionally introduced into the dried and dispersed flux product and lime (CaO) in the form of burnt dolomite and before filling, barium carbonate - strontium BSK-2 of an agreed size with a mass fraction of chemical 2. The method according to claim 1, characterized in that the components of the secondary aluminum-containing slag for the flux are hydrated by placing-dumping on a waterproof base inclined to the horizon in the form of erected line collars, adjacent of which form a system of drainage parallel drains, hydraulically interconnected a collecting collector, which, by means of two slide gates, is respectively connected by channels with two autonomous pond collectors, one of which is designed to collect hydration brine, and the other is an evaporator of hydration brine, while the pond collectors are equipped with a movable ventilated roof damper, the area of which is proportional to the area of the pond collector.