JPH1053820A - Treatment of metal compounds of steel dust, sludge and/ or ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment method for steel making dust and sludge metal compds. which decreases the calorific value to be charged at the time of treating the steel making dust and sludge metal compds. by utilizing aluminum-containing aluminum residue ashes in particular as the treatment method for the steel making dust and sludge metal compds. SOLUTION: Carbon-contg. reducing agents and the aluminum-containing aluminum residue ashes and further, binders at need are added and mixed to and with the steel making dust and sludge metal compds. and/or metal compds. contg. ores of at least one among any of nickel ore, chromium ore, manganese ore, titanium ore and iron ore and the mixture is molded to form moldings. These moldings are ignited to be self burned by heating or electric discharging and thereafter, the moldings are charged into a melting furnace and are subjected to reduction melting. The moldings are otherwise charged directly into the melting furnace and are subjected to the reduction refining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating metal compounds of steelmaking dust, sludge and / or ore, and more particularly to a method of treating steelmaking dust using aluminum residual ash containing aluminum.
The present invention relates to a method for treating steelmaking dust and sludge metal compounds in which the amount of heat input during the treatment of sludge metal compounds is reduced.

[0002]

2. Description of the Related Art Conventionally, as a method of treating steelmaking dust and sludge metal compounds, a carbon-based reducing agent and a binder are added thereto, mixed and formed into pellets or briquettes, and the resulting pellets or briquettes are formed. A technique is known in which a material is preheat-dried, then put into a high-temperature slag and heated to reduce and recover useful metals. For example, Japanese Patent Application Laid-Open No. Sho 60-43444 discloses a method for effectively utilizing the sensible heat of slag. Pollution-free treatment of dust for recovering Ni and Fe is disclosed. It is also a method utilizing sensible heat of slag, which uses carbonaceous material as a reducing agent and combines it with various reducing aids to treat steelmaking dust and sludge metal compounds. . For example, Japanese Patent Publication No. 60-159128 discloses CaCl ₂ or NaCl as a reducing aid,
No. 0-159133 discloses CaCl ₂ , NaCl and cast iron powder, and Japanese Patent Publication No. 60-159129 discloses Ca
Cl ₂ , NaCl or soda ash can be obtained by
No. 9130 discloses an alkali metal carbonate (Na ₂ CO ₃ ,
Techniques using K ₂ CO ₃₎ is disclosed, respectively.

[0003] However, these methods are all technologies using slag sensible heat as a heat source, and thus have a drawback that the processing amount is restricted by the amount and timing of slag generation. In addition, since carbonaceous material is used as the reducing agent, the reaction time is long and the reduction efficiency is low unless the temperature is raised to 1,400 ° C. or higher.
In addition, when dust and sludge metal compounds are introduced into the slag, the slag temperature is lowered to suppress the reaction, and furthermore, the viscosity of the slag increases sharply, and the volatilization of volatile components becomes incomplete. . In order to suppress a decrease in the temperature of the slag, a method of preliminarily mixing and burning a combusting agent, for example, a liquid fuel, into the lump-shaped product (see Japanese Patent Application No. 59-136364) or a method of mixing a carbonaceous fuel and a combustion aid ( A method in which a block formed by mixing iron powder, aluminum powder, ferrosilicon powder, and KCl) is roasted and reacted with slag (Japanese Patent Application Laid-Open No. 60-18124).
No. 7, JP-A-60-218415),
Carbonaceous, aluminum powder, ferrosilicon powder as a reducing agent, NaCl, CaCl ₂ , KClO ₃ as a reducing aid,
A method using cast iron powder (see JP-A-60-187632) is known. These methods have drawbacks in that the roasting of a lump-shaped molded article requires a long time of 3 to 5 hours because a carbonaceous reducing agent is used, and the control of the amount of air is difficult and the baking tends to be uneven. As a result, there arises a problem that the recovery rate of the valuable metal is deteriorated.

Japanese Patent Application Laid-Open No. 6-179905 discloses a method in which dusts and sludge metal compounds are heated and dried to be blown into a coke or packed-bed hardened furnace as powder to reduce the same. However, this method is not a method that can be adopted unless a large amount of equipment and a large amount of processed material are supplied. In addition, aluminum-containing aluminum residual ash (hereinafter A)
With respect to the technology utilizing the thermite reaction of Al in 1 residual ash), there is a method of recovering Zn from steelmaking dust and sludge (JP-A-5-202436). In this method, steelmaking dust and sludge are reduced and roasted in a rotary kiln or the like, and volatile components such as Zn and Pb are collected as crude zinc oxide. Al residual ash and flux (CaO, Na ₂ CO ₃ , NaOH, etc.) are added to the crude zinc oxide to form an agglomerate, and Zn is formed by a thermite reaction between Al and ZnO.
Is reduced and volatilized. This is a technique for collecting volatile metal Zn with a filter. This technique obtains Zn in two stages, that is, crude zinc oxide and volatile reduction, and has the disadvantage that a large amount of heat energy is consumed in each stage.

[0005]

The present inventors have made various studies to improve the above-mentioned drawbacks, and as a result, have found that Al powder containing Al ₂ O ₃ together with a carbonaceous reducing agent, particularly a by-product when Al is dissolved. good moldability massive molded article by using the Al residual ash, found that massive molded article having improved roasting can be obtained, and high reaction rate further the specific Al thermit reaction, Al ₂ O ₃ generated heat Because of the fact that the temperature of the molded article itself is effectively increased and the recovery rate of the metal is improved, the present inventors have further studied based on this finding, and as a result, the present invention has been completed. An object of the present invention is to provide a method for treating steelmaking dust and sludge metal compounds in which the amount of heat applied from the outside during treatment of steelmaking dust and sludge metal compounds is reduced using aluminum-containing aluminum residual ash.

[0006]

The gist of the invention of claim 1 of the present application is that steelmaking dust, sludge metal compounds and / or at least one of nickel ore, chromium ore, manganese ore, titanium ore, and iron ore To a metal compound containing ore, a carbon-containing reducing agent and aluminum-containing aluminum residual ash and, if necessary, a binder are added, mixed and formed into a molded body, which is heated or discharged to ignite and ignite. The method for treating steelmaking dust and sludge metal compounds is characterized in that the steelmaking dust and sludge metal compounds are charged into a melting furnace and then reduced and melted. The gist of the invention of claim 2 is that the steelmaking dust and sludge metal compounds and / or Or a metal compound containing at least one ore of nickel ore, chromium ore, manganese ore, titanium ore and iron ore, a carbon-containing reducing agent and an aluminum-containing aluminum ash And, if necessary, a binder is added, mixed and molded to form a molded body, which is charged into a melting furnace, and the molded body is heated or discharged, ignited and self-fired to reduce and melt. Steelmaking dust and sludge metal compounds. In the present invention, since the heat of formation of Al ₂ O ₃ generated during reduction melting supplies most of the heat required for reduction of the metal oxide, energy saving is achieved.
This is a method for treating steelmaking dust and sludge metal compounds that are highly effective.

[0007] That is, the invention of claim 1 of the present application is to form a compact by first mixing a carbonaceous reducing agent and Al residual ash with dust and sludge metal compounds. When it is difficult to form a molded product, a binder is added to form a molded product. Next, the obtained molded body is heated or discharged to ignite and self-burn. At that time, the moisture and volatile metals (Na, K, Zn,
Pb) evaporates. After the roasting, the massive compact is charged into a smelting reduction furnace to reduce the metal to carbon. According to a second aspect of the present invention, after a bulk compact is obtained by a similar method, it is air-dried, then directly charged into a smelting reduction furnace, ignited, and self-burned. At that time, the metal Al and the metal oxide react as shown in the following formula inside the massive compact to generate metal and Al ₂ O ₃ . _{3NiO + 2Al = 3Ni + Al 2} O 3 ...... (1) Fe 2 O 3 + 2Al = 2Fe + Al 2 O 3 ...... (2) Cr 2 O 3 + 2Al = 2Cr + Al 2 O 3 ...... (3) 3MnO + 2Al = 3Mn + Al 2 O 3 ...... ( 4) The heat of formation of Al ₂ O ₃ is as large as 390 Kcal / mol, and the heat of formation raises the temperature of the bulk compact itself. Therefore, it is an excellent smelting reduction method that can reduce metals without supplying much external energy. is there.

[0008]

Embodiments of the present invention will be described below in detail. The steelmaking furnace dust and sludge metal compounds which are the objects to be treated in the present invention are mainly composed of metal oxides. However, when CaO is used as a neutralizing agent for sludge treatment, sulfates such as CaSO ₄ , CaF ₂ And nitrates and metal hydroxides. Therefore, in the present invention, the reduction of the metal oxide and the decomposition of the sulfate and the metal hydroxide are carried out by using a carbon-containing reducing agent and an aluminum-containing aluminum residual ash (also referred to as Al residual ash).

The carbon-containing reducing agent used in the present invention may be any one which is usually used for reducing metal oxides, such as coke, carbon breath, charcoal, and coal powder. The particle size is 0.1 to 15
mm is appropriate. Further, as the residual ash used in the present invention, a maximum diameter of 2 m containing 30% by weight or more of metallic Al is used.
m or less. That is, it is necessary to use Al powder in the present invention that has a small particle size, is relatively uniform, and does not have a too wide particle size distribution. Preferably the average particle size is 0.01 to 0.2 m
m and a maximum particle size of 2 mm or less.

In the present invention, the alumina (A
The role of the l ₂ O ₃ ) powder is to regulate the rate of thermite reaction. Therefore, in order to control the reaction rate of the thermite reaction, it is necessary to contain 30% or more and 70% or less of Al ₂ O ₃ powder. 70% Al ₂ O ₃ powder content
If the amount exceeds 30%, the reaction is suppressed and the reaction time is prolonged. If the amount is less than 30%, the reaction proceeds in a short time, and a bumping phenomenon is observed. Preferably Al ₂ O _3: in the range 40-55%. The particle size distribution of Al ₂ O ₃ is preferably the same as that of Al powder. As such an Al ₂ O ₃ -containing Al powder, Al residual ash generated as a by-product when Al is dissolved is suitable. In particular, metal Al: 10 to 50% (preferably 25 to 40%) of the remaining Al ash from which metal Al is recovered.
%), AlN: 1 to 20% (preferably 5 to 15%),
Al ₂ O ₃ : 30 to 70% (preferably 40 to 55%) can be used.

The mixing ratio of Al residual ash to steelmaking dust and sludge metal oxides is 1% to 10% in terms of metal Al content.
So that Preferably it is 2% to 6%. If the content of metal Al is 1% or less with respect to the raw material, roasting is impossible, and if it is 10% or more, a lump is crushed due to rapid generation of heat generated. In the present invention, a compact is formed from steelmaking dust, sludge metal compounds, a carbon-containing reducing agent, and Al residual ash. Usually, these can be easily molded, but when molding is difficult, a binder is added. As the binder, stearic acid, polyvinyl alcohol, Portland cement or the like is used. The molding is performed by a twin roll briquette machine or a pelletizer. The shape of the molded article may be any form such as a pellet or briquette, and is preferably 20 to 50 mm in terms of diameter (diameter conversion).
It is a lump shaped product having a diameter of about 100 to 200 g.

In the direct reduction treatment method in which a lump compact is directly charged into a reduction furnace, the mixing ratio (as the metal Al mixing ratio)
Is 1 to 10% as described above. If the Al content exceeds 10%, the heat of generation of Al ₂ O ₃ becomes too large, and the reduction furnace may be damaged. Therefore, if the amount of Al is insufficient to reduce the metal oxide contained in the raw material, a carbonaceous reducing agent is added. If the bulk compact directly charged to the reduction furnace is heated or discharged without being roasted, a thermite reaction starts, and the temperature of the bulk compact rapidly rises. Volatile components evaporate from the temperature rising portion. Volatile components are cooled and recovered in the duct.

As described above, since the metal Al is blended in an amount of 1 to 10%, the furnace temperature rises due to the heat of formation of Al ₂ O ₃ . If the mixing ratio of metal Al exceeds 5%, the furnace may be damaged due to rapid heat generation, so it is necessary to charge the bulk compact several times at a time. When the mixing ratio of metal Al exceeds 3%, the temperature in the furnace reaches 800 ° C. or more by self-firing, so that if a small amount of external energy (for example, arc discharge) is supplemented, the reduction reaction can be continued and the power consumption can be greatly reduced. In addition, the reaction time is shorter,
Raw material throughput is greatly increased. According to the results obtained by the present inventors, it was possible to approximately double the raw material processing amount when the metal Al content was 3%. In the method of pre-roasting the massive compact, the roasting time was reduced to about 1/2. The obtained roasted body was uniformly and homogeneously baked, and reduced metal was observed inside (×
100 microscope). Al not containing Al ₂ O ₃ powder
When the powder was used, the pre-roasting burned rapidly and explosively, resulting in an increase in the temperature of the central portion, and the compact was crushed by the ejection of generated gas such as water vapor. The control of the burning time could be achieved by mixing Al ₂ O ₃ powder having the same particle size distribution as Al powder. The mixing ratio is the amount of metal Al ×
The range of (1.5 to 5) is preferable. The burning time becomes longer as the proportion of Al ₂ O ₃ increases.

[0014]

[Examples and Comparative Examples]

Example 1 Example of Use as Roasting Auxiliary Agent Sludge, electric furnace dust metal compounds and nickel ore powder (10% blended) to promote the roasting of a lump compact.
10% by weight of Al residual ash was added to and mixed with a raw material prepared by mixing an appropriate amount of carbon breeze. Table 1 shows the chemical components of the raw materials used. Table 2 shows the chemical composition of the residual aluminum ash.
Shown in

[0015]

[Table 1]

[0016]

[Table 2]

(1) Preparation materials 5,000 k shown in Table 1
g, about 300 liters of water was added to 550 kg of Al residual ash shown in Table 2, and the mixture was kneaded with a rotary mixer for 10 minutes. Put this in a steel container about 1,0
After adding 00 kg, it was air-dried for 100 hours. The briquette solidified well, and the occurrence of defects such as breakage and chipping was the same as that of the conventional product (with no residual aluminum ash). The compressive strength (strength at which the briquettes are crushed by compression) of the bulk compact (briquette) is determined by the conventional method (Al
(Addition of residual ash) was the same as about 100 N, but the compressive strength after drying was about 3 to 4 times that of the method of the present invention. Table 3 summarizes the properties of briquettes.

[0018]

[Table 3]

(2) The dried briquettes are put in a roasting box (1.2 m × 1.2 m × 0.8 mH) for about 1,500 k
g and the bottom was heated with a propane gas burner for 30 minutes to ignite. Table 4 shows the results. Compared with the conventional method, the method of the present application was superior in ignitability and retention of ignition, the burning time was reduced to about 1/2, and the burning result was also good.

[0020]

[Table 4]

Example 2 Example of Use as a Roasting Auxiliary Agent The prepared raw materials shown in Table 1 had a metal Al content of 10.5.
%, 21.3%, 30.6% Al residual ash, and metal Al powder (Al content 82% Al-remaining Al ₂ O ₃ ), relation between metal Al content in briquette and ignitability Are shown in Table 5. If the metal Al content of the prepared raw material is 1.5% or more, self-burning occurs, so that metal A in aluminum residual ash
If the l content is 10% or more, it can be put to practical use. Further, when the metal Al content is 50% or more, the burning rate becomes too fast and handling becomes difficult, and when the Al content is high, the cost increases. Therefore, metal Al in the residual ash
The content is suitably from 10 to 50% by weight. Above all, Al
Those with a content of around 30% have higher cost performance.

[0022]

[Table 5]

Example 3 Example of Directly Loading a Molded Body Added with Al Residual Ash A molded body (hereinafter referred to as α-10-Pt) formed by blending 10% of Al residual ash with the prepared raw material was reduced. The furnace was charged directly. α-10-Pt automatically ignites in the raw material layer,
A volatile alkali metal gas was released in the thermite reaction. The atmosphere temperature under the canopy is 700 ~
It could be kept at 800 ° C. The alkali metal gas was also oxidized by the air blowing, and was collected and removed as dust outside the furnace. The purpose of the roasting was to remove the feed-up obstruction of the reduction furnace due to the accumulation of volatile alkali metals, but the blow-up obstruction could be prevented by blowing air. As shown in Table 6, if the temperature is 700 ° C., even zinc (Zn) having the lowest vapor pressure has a pressure of 61 mmHg = 0.
The saturated vapor pressure becomes 08 atm. On the other hand, the concentration of volatile alkali metal in α-10-Pt was 4% as shown in Table 7.
From the following, if the raw material layer is kept at 650 ° C. or higher, precipitation and concentration of alkali vapor does not occur. Without roasting, α-10-Pt was mixed with a reducing material and a slag-making material, and was directly charged into a reducing furnace at room temperature. By adjusting the inflow of air under the canopy and keeping the ambient temperature at 700-800 ° C, α-10-
Pt was automatically ignited, and the entire raw material exceeded 700 ° C.
The open furnace has a large air inflow and the ambient temperature is 40
The temperature became 0 ° C. or lower, and the ignition of α-10-Pt was greatly delayed. CO of 700 ° C or more from the carbon reduction layer below the raw material layer
It can be determined that there is a delay until the gas comes into contact with α-10-Pt at a high temperature, that is, until the input raw material is successively digested, moves to the lower layer, and reaches the ignition temperature. If the atmosphere under the canopy is kept at 700 ° C. or higher while reducing, vapor deposition and recovery can be performed without oxidizing the alkali metal vapor. However, it is necessary to sufficiently remove water in the raw material. Raw material moisture is only 0.6
% Oxidizes all metal vapors. Even when the water content is zero, various hydroxides in the raw material successively release water vapor at 400 ° C. or higher to oxidize metal vapor. In order to make the atmosphere of the canopy sufficiently reducible, it is necessary to keep the temperature high and to blow in LPG or the like.

[0024]

[Table 6]

[0025]

[Table 7]

Example 4 Direct charging of molded product containing Al residual ash + mixed powder If the raw material composition is changed, for example, if the amount of sludge is small, and if the amount of scale and dust is large, the temperature rise of the raw material layer is caused only by α-10-Pt. However, partial fusion occurred, and another difficulty in furnace operation occurred. In order to solve this difficulty, the residual ratio of Al ashes was reduced to 9%, and the molded body and the mixed powder before molding were blended at about 3: 1 and directly charged. The canopy temperature was slightly higher than in Example 3 and was 720-830 ° C. Although the alkali concentration in the dust is lower than that in Example 3, there is no blowing failure,
Almost the entire amount could be removed outside the furnace. Sludge contains many fluorine, chlorine, cuts significantly slag melting point, but came invited molten metal discharge difficulties due to the decrease of the melt temperature, the slag melting point is increased by Al ₂ O ₃ added and also eliminates this difficulty. The addition of Al residual ash has an effect of reducing the power consumption unit, and has enabled an increase in production. At the same time, the addition of Al ash increases the concentration of Al ₂ O _{3 in the} slag, increases the melting point, and has the effects of improving the Cr yield and facilitating the discharge of molten metal. When the sludge in the raw material decreases, scale and dust increase, the metal hydroxide of the molded body decreases,
The temperature rise after ignition is large, which speeds up the reaction rate and increases the temperature rise rate. Raw materials with less sludge have less fluorine and chlorine and a slightly higher slag melting point. Therefore, it is desirable to reduce the addition of residual aluminum ash and adjust the slag melting point. Considering the situation, the addition of Al residual ash was reduced to 9%,
The slag was excessively increased in melting point and was directly mounted at a molded body: prepared raw material ratio of 2: 1, 3: 1. Furnace conditions were more stable in 3: 1 with less raw materials. That is, the fluctuation of the temperature under the canopy was small, and the fluctuation rate (standard deviation / average value) of the dust component was also small (see Table 10). Table 8 shows the raw material composition before the addition of Al ash, and Table 9 shows the average slag of Examples 3 and 4.

[0027]

[Table 8]

[0028]

[Table 9]

[0029]

[Table 10]

The alkali metal vapor is oxidized under the canopy and collected as dust. When the temperature of the raw material layer is lowered, it condenses and causes a concentration effect. In Examples 3 and 4, zinc was assumed to have a maximum saturation temperature of 14 mmHg or less, and if the raw material layer temperature was 610 ° C or more, it was determined to be complete. During the test period, the raw material layer temperature was always 650 ° C. or higher. As a precautionary measure, a sample of the raw material layer was collected and inspected for the presence or absence of precipitation. Precipitates were observed on the surface of the molded product. According to X-ray analysis, SiO ₂ , MgO, Al ₂ O ₃ , and CaO were the main components, and Zn, Na, and K were weak.

Example 5 Molding of Dry Raw Material and Al Residual Ash With raw materials having a high sludge ratio, the amount of Al residual ash must be increased to prevent the melting point of slag from lowering. As a result, the carbon reduction rate decreases and the Al thermite rate increases. As a result, the alkali metal vapor concentration increases. That is, precipitation trouble is likely to occur. As the mixing ratio of Al ash increases, the production increases even with the same power load. As shown in Table 11, the raw material having a large amount of sludge has a high moisture content, and causes deliquescent trouble in the dust collector. Although the raw material may be dried, there is a disadvantage that the moldability is weakened. However, as described above, the increase in the mixing ratio of the residual aluminum ash results in a reduction in the power consumption and an increase in the production amount, and a high Al ₂ O ₃ slag is obtained. This slag is also used as a slag-making material.

[0032]

[Table 11]

A small amount of stearic acid and kerosene were added to the dry raw material to impart lubricity to the powder, shorten the distance between particles, and secure molding strength. As shown in Table 7, when Al residual ash increased, the amount of carbon material (small lump Coke) to be added rapidly decreased, and carbon-free was easy to handle as a preparation raw material. To dry the raw materials shown in Table 11 and further reduce the carbon content and reduce them only with Al thermite, stoichiometrically 30% Al, 6%
% AlN, about 0.585 kg / kg-B of Al ash is required, but the produced slag has a high Al ₂ O ₃ and CaF ₂
, The melting point was too high, and it was expected that furnace operation would be difficult (see Table 12). Of course, the raw material of only sludge is made of high Al
Although the above-mentioned difficulties can be solved by reducing with Al residual ash, economic difficulties arise.

[0034]

[Table 12]

[0035]

【The invention's effect】

(1) Metal oxide and Al contained in sludge and dust
The raw material briquette can be easily roasted by thermite reaction of metallic aluminum contained in the residual ash. In other words, the ignitability and retention of ignition of the briquette are good, and the briquette is uniform and does not sinter. The burning time is shortened to about 1/2 compared to the briquette without the addition of Al residual ash. (2) The compressive strength of the briquette can be increased by adding aluminum ash. With 10% Al residual ash,
The compressive strength of the briquette was about three times that of the case where no residual aluminum ash was added. (3) By utilizing the heat of formation of Al ₂ O ₃ generated by the reaction of Al with the metal oxides contained in the sludge and dust of the raw material for heating the raw briquette itself, it is possible to greatly reduce the external energy required for reduction. It is. When reduced in an electric furnace,
The power consumption per unit was reduced to about で when 10% of Al residual ash was mixed (metallic Al = 3%). (4) The thermite reaction requires a control because the reaction rate is high. The reaction rate can be controlled in a practical range by adjusting the particle size distribution and content of the Al ₂ O ₃ powder in the Al residual ash. The reduction time can be reduced to about で by controlling the heat quantity of the Al ₂ O ₃ generation and the reaction rate, and the productivity can be improved. Since the raw material processing capacity has doubled, Ni ore and chromium ore can be pulverized and used in sludge and steelmaking dust. (5) When the amount of CaF ₂ is large in the sludge, the melting point of the slag decreases, and the reduction ratio of Cr and Mn deteriorates. However, Al
By using the residual ash, the slag contains Al ₂ O ₃ , and as a result, the melting point of the slag increases, and the recovery of the effective metal is improved.

Claims (4)

[Claims] 1. A carbon-containing reducing agent and an aluminum-containing aluminum in a steel compound dust, a sludge metal compound and / or a metal compound containing at least one ore of nickel ore, chromium ore, manganese ore, titanium ore and iron ore. Add residual ash and, if necessary, a binder, mix and mold to form a compact, heat it or discharge it to ignite and burn it. A method for treating metal compounds of steelmaking dust, sludge and / or ore, characterized by the following. 2. A metal compound containing at least one of steelmaking dust, sludge metal compounds and / or at least one of nickel ore, chromium ore, manganese ore, titanium ore and iron ore, a carbon-containing reducing agent and an aluminum-containing aluminum Residual ash and, if necessary, a binder are added, mixed, and molded to form a molded body, which is charged into a melting furnace, and the molded body is heated or discharged, ignited, and reduced and melted while self-burning. A method for treating metal compounds of steelmaking dust, sludge and / or ore, characterized in that: 3. The aluminum-containing aluminum residual ash contains metal: 10 to 50% by weight, AlN: 1 to 20% by weight,
Al ₂ O _3: claims 1 and 2 steelmaking dust according characterized in that it contains 30 to 70 wt%, processing method of sludge metal compounds. 4. The aluminum-containing aluminum residual ash has a maximum particle size of 2 mm or less and an average particle size of 0.01 to 0.5 mm.
3. The method for treating metal compounds of steelmaking dust, sludge and / or ore according to claim 1, wherein the diameter is 2 mm.