CN114150098B - Method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash - Google Patents
Method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash Download PDFInfo
- Publication number
- CN114150098B CN114150098B CN202111406602.3A CN202111406602A CN114150098B CN 114150098 B CN114150098 B CN 114150098B CN 202111406602 A CN202111406602 A CN 202111406602A CN 114150098 B CN114150098 B CN 114150098B
- Authority
- CN
- China
- Prior art keywords
- aluminum
- iron
- calcium aluminate
- parts
- iron ore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/164—Calcium aluminates
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B15/00—Other processes for the manufacture of iron from iron compounds
- C21B15/02—Metallothermic processes, e.g. thermit reduction
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash, belonging to the field of solid waste recycling. The method comprises the steps of mixing secondary aluminum ash, quicklime and iron ore powder, reducing iron oxide in iron ore by using aluminum nitride in the secondary aluminum ash and metallic aluminum at high temperature, and separating slag from gold to obtain premelted calcium aluminate and metallic iron. The invention fully utilizes the reducibility of aluminum nitride and metallic aluminum in the secondary aluminum ash to reduce iron oxide in iron ore into metallic iron, oxidize the aluminum nitride into aluminum oxide and nitrogen, and oxidize the metallic aluminum into aluminum oxide, thereby avoiding the pollution of ammonia gas generated by hydrolysis of the aluminum nitride and the potential safety hazard of the aluminum due to spontaneous combustion. The method fully utilizes the characteristics of reducibility and high alumina content of the secondary aluminum ash, realizes high-value utilization of the secondary aluminum ash, and has the advantages of no pollution, short flow, low cost and easy industrialization.
Description
Technical Field
The invention belongs to the field of solid waste recycling, and particularly relates to a method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash.
Background
The secondary aluminum ash produced in the aluminum industry of China per year exceeds 500 ten thousand tons, and the growth is rapid. The secondary aluminum ash contains 50-80wt.% of aluminum oxide, 8-25wt.% of aluminum nitride, 10-20wt.% of salt (sodium salt, potassium salt and fluorine salt) refining agent and 2-8wt.% of metal aluminum, wherein the aluminum nitride is easy to hydrolyze to generate ammonia gas, the salt is easy to dissolve to cause soil, water and air pollution, and the aluminum has potential safety hazard due to spontaneous combustion. Secondary aluminum ash is listed as a hazardous HW48 waste due to reactivity and flammability and has become a "bottleneck" for the sustainable development of the aluminum industry.
The industrialization research of secondary aluminum ash is carried out since 1990 abroad, the Berzelius Umwell-Service AG adopts a wet process of grinding, screening, washing and drying to recover simple substance aluminum, and industrial raw materials for removing cement are prepared after denitrification and dechlorination drying, and industrialization is realized in Germany. Then, the similar wet process is adopted by the industry of the Aixie aluminum industry, the Mei aluminum industry, the Lu Ma Ke Si industry, the German potash fertilizer Gong, the Reynolds aluminum industry and the like to produce the oxide, and the oxide is recycled for cement, ceramics, mineral wool, refractory materials, steelmaking deoxidizer, exothermic agent and the like according to the content of alumina and market requirements.
The domestic secondary aluminum ash disposal or utilization is divided into two stages. The first stage is before 2021 years, and the secondary aluminum ash is mainly applied to steel-making deoxidizing agents, water purifying agents, cement additives and the like. The second stage is from 2021, after the secondary aluminum ash is classified as dangerous waste, most of the secondary aluminum ash is still stored in waste production enterprises at present, and a green recycling technology approved by the state is urgently needed. The research on green recycling of secondary aluminum ash becomes a focus and a hot spot, and mainly focuses on two processes, namely a wet process and a fire process.
The wet method is to hydrolyze aluminum nitride by means of water washing, evaporation and the like, absorb ammonia gas and remove soluble salts, then leach aluminum by acid/alkali solution, and prepare the final product by precipitation, roasting and the like of the leachate. The fire method is to add other raw materials and to prepare building materials or refractory materials through high-temperature sintering or melting treatment.
Chinese invention patent (CN 111137912A) discloses a method and equipment for producing calcium aluminate raw material for water purifying agent by using industrial waste, the method comprises mixing aluminum ash raw material, coal gangue, limestone and lanthanide rare earth, making brick, molding, and roasting in a mechanical kiln, wherein the roasting process comprises a low temperature section of 0-600 ℃, a high temperature section of 600-1300 ℃ and a medium temperature section of 600-200 ℃ in sequence, and the roasted product is cooled to obtain the calcium aluminate raw material for water purifying agent. The patent generates a large amount of ammonia pollution in the brick making process, does not utilize the reducibility of aluminum nitride and aluminum, and has the advantages of long flow, complex equipment and high production cost.
Chinese patent (CN 110194474B) discloses a process for producing polyaluminium chloride and calcium aluminate by using aluminium ash, which comprises the steps of carrying out deamination, defluorination and filtration treatment on secondary aluminium ash after ash frying to obtain filtrate and filter residue, wherein the filtrate is polyaluminium chloride solution, washing the filter residue to be neutral, uniformly mixing the filter residue with calcium-based auxiliary materials, drying, carrying out high-temperature reaction, and carrying out cooling, crushing and grinding treatment after the reaction to obtain the calcium aluminate. This patent adopts water scrubbing nitrogen removal, deamination, defluorination, produces ammonia pollution and a large amount of waste water, and follow-up environmental protection is dealt with the degree of difficulty big, is dealt with high costsly, does not utilize the reducibility of aluminium nitride and aluminium.
The Chinese invention patent (CN 112723400A) discloses a method for melting calcium aluminate by synchronously activating, inerting, impurity removing and melting low-magnesium aluminum ash, the Chinese invention patent (CN 112607758A) discloses a method for preparing calcium aluminate by synergistic treatment of high-magnesium aluminum ash and fly ash, and the Chinese invention patent (CN 112680564A) discloses a method for melting a calcium aluminate steelmaking desulfurizer by high-magnesium aluminum ash, wherein the above patents all mix aluminum ash slag and calcium-containing raw materials, remove nitrogen by wet ball milling, then carry out solid-liquid separation on ball-milled materials, and then carry out drying and roasting treatment, thus obtaining a calcium aluminate product. The ball milling process of the patent consumes long time and has low efficiency; a large amount of ammonia gas and sewage containing ammonia, fluorine and chlorine are generated in the wet ball milling process, so that the environmental protection disposal difficulty is high and the cost is high; the aluminum nitride and the reducing property of aluminum are not utilized.
Chinese patent (CN 110182837A) discloses a method for producing calcium aluminate by using aluminum ash, which mixes the aluminum ash and calcium oxide, and then obtains a calcium aluminate product by smelting, crushing and screening in an electric arc furnace. The patent does not utilize the reducibility of aluminum nitride and aluminum, does not carry out nitrogen removal treatment on secondary aluminum ash, and the obtained calcium aluminate product has high nitrogen content and is easy to pulverize and hydrolyze to generate ammonia pollution.
The existing secondary aluminum ash disposal and resource utilization method does not fully utilize the reducibility of the secondary aluminum ash, does not avoid the pollution of ammonia gas generated by the hydrolysis of aluminum nitride in the disposal or utilization process, and has long process flow, high cost and difficult industrialization. Therefore, it is necessary to develop a method for fully utilizing the reducibility of the secondary aluminum ash and the alumina therein, so as to realize low-cost, green and high-value utilization of the secondary aluminum ash hazardous waste.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash. The invention fully utilizes the reducibility of aluminum nitride and metallic aluminum in the secondary aluminum ash to reduce iron oxide in iron ore into metallic iron, oxidize the aluminum nitride into aluminum oxide and nitrogen, and oxidize the metallic aluminum into aluminum oxide, thereby avoiding the pollution of ammonia gas generated by hydrolysis of the aluminum nitride and the potential safety hazard of the aluminum due to spontaneous combustion.
The invention provides a method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash, which is characterized by comprising the following steps:
(1) Preparing materials: proportioning and mixing the secondary aluminum ash, the quicklime and the iron ore powder to obtain a uniform mixture;
(2) Melting: heating and melting the mixture, reducing iron ore powder by aluminum nitride and aluminum in the secondary aluminum ash to obtain metallic iron, and reacting quick lime with alumina to obtain calcium aluminate;
(3) Separating slag and gold: and separating and cooling the molten metallic iron and the calcium aluminate to obtain the metallic iron and the pre-molten calcium aluminate.
Further, the mixture ratio in the step (1) is 25-50 parts of secondary aluminum ash, 28-52 parts of quicklime and 10-40 parts of iron ore powder; after the proportioned materials are mixed, the nonuniformity of the mixture is less than or equal to 5 percent.
Further, the melting in the step (2) heats the mixture to 1400-1600 ℃, then the temperature is kept for 1.0-3.0h, aluminum nitride and aluminum in the secondary aluminum ash reduce iron ore powder to obtain metallic iron, and the calcium aluminate is obtained by the reaction of calcium oxide and aluminum oxide.
Furthermore, the slag-metal separation in the step (3) adopts a casting-cooling method, the density of the metallic iron is higher at the lower part of the casting mould and is solidified, the density of the calcium aluminate is lower at the upper part of the casting mould, and the separation of the metallic iron and the premelted calcium aluminate is realized.
Further, slag-metal separation in the step (3) adopts slag-metal shunt casting solidification to respectively obtain metallic iron and premelted calcium aluminate.
The principle of the invention is as follows:
(1) Principle of aluminum nitride for reducing iron ore
(1) In the aspect of thermodynamic principle
The aluminum nitride has reducibility, and can reduce iron oxide (mainly Fe) 3 O 4 And Fe 2 O 3 ) The redox reaction formulas are shown as (1) and (2), and the reaction Gibbs self of the redox reaction formulasThe energy change (Δ G) is calculated from the formula (3), where Δ G is gibbs free energy change, T is reaction temperature, Δ S is reaction entropy change, and Δ H is reaction enthalpy change. The Δ G of the formulae (1) and (2) is shown in fig. 2 as a function of the reaction temperature. As can be seen from fig. 2, Δ G of both the formula (1) and the formula (2) in the period from normal temperature to high temperature is negative, and the negative value of Δ G increases with increasing temperature. According to physicochemical principles, a negative Δ G value indicates that the reaction is allowed to proceed, and the more negative Δ G value, the more likely the reaction is to occur. Thus, aluminum nitride reduction of iron oxides is thermodynamically feasible.
8AlN+3Fe 3 O 4 ＝4Al 2 O 3 +9Fe+4N 2 (g) (1)
2AlN+Fe 2 O 3 ＝Al 2 O 3 +2Fe+N 2 (g) (2)
ΔG＝ΔH-TΔS (3)
(2) In the aspect of dynamics principle
Chemical reaction constants K corresponding to the reaction formulas (1) and (2) 1 And K 2 Can be represented by formula (4) and formula (5), respectively, wherein K 1 Is the chemical reaction constant, K, of equation (1) 2 Is the chemical reaction constant of equation (2), and c (i) is the activity of substance i.
The reaction formulae (1) and (2) are both isothermal and isobaric reactions in actual production, in which case the van t hoff isothermal formula is written as formula (6), wherein Δ G is the gibbs free energy change of the reaction, Δ G 0 Is the standard gibbs free energy change for this reaction, R is the gas constant, T is the reaction temperature, and K is the reaction constant.
ΔG＝ΔG 0 +RT ln K (6)
Δ G =0 when the reaction is in equilibrium, at which time Δ G 0 = -RT ln K, thus can be represented by Δ G 0 The chemical reaction constant K at the corresponding reaction temperature was determined. The chemical reaction constants of the reaction formulas (1) and (2) at 1400-1600 ℃ are shown in Table 1, wherein K is 1 Represents the chemical reaction constant, K, of equation (1) 2 Represents the chemical reaction constant of equation (2).
TABLE 1 values of chemical reaction constants of 1400-1600 ℃ for aluminum nitride reduction of iron oxides
It is generally considered that K>10 5 The reaction is relatively complete, and as can be seen from Table 1, the K values of the reactions (1) and (2) are both much greater than 10 at 1400-1600 ℃ 5 Thus, aluminum nitride is kinetically feasible to reduce iron oxide.
In summary, aluminum nitride reduction of iron oxides is both thermodynamically and kinetically feasible.
(2) Principle for preparing calcium aluminate
The secondary aluminum ash contains a large amount of aluminum oxide and aluminum nitride, the aluminum nitride reacts with iron ore powder to generate aluminum oxide (the reaction is shown as formula (1) and formula (2)), and quick lime is added to generate premelted calcium aluminate for steelmaking with high added value through melting, and the chemical reaction equation is shown as formula (7). The Gibbs free energy change delta G of the reaction formula (7) at 1400-1600 ℃ is negative, and the chemical reaction constant K is far greater than 10 5 The discussion process is the same as the principle of reducing iron ore by aluminum nitride. Therefore, the preparation of calcium aluminate from alumina and quicklime is thermodynamically and kinetically feasible.
(3) Principle of separating slag from gold
Aluminum nitride in secondary aluminum ash and iron oxide in metal aluminum high-temperature reduction iron ore react to form metallic iron, aluminum oxide and quick lime to form premelted calcium aluminate, and the density of the metallic iron is about 7.86 g/basedcm 3 The calcium aluminate density is about 3.00g/cm 3 . In the molten state, the metallic iron sinks to the bottom of the melt, and the calcium aluminate is on the upper part of the melt, so that slag-metal separation can be realized by a casting-cooling method or a slag-metal shunt casting solidification method.
(4) Principle of reducing energy consumption
The secondary aluminum ash has high heat value of about 3000kcal/kg, about half of that of electric coal. The secondary aluminum ash heat value comprises two parts: firstly, the calorific value generated by oxidation reduction of aluminum nitride and iron oxide in iron ore; secondly, the heat value generated by the aluminothermic reaction of the metal aluminum and the iron oxide. The invention fully utilizes the heat value and greatly reduces the energy consumption.
The key point of the technology of the invention lies in
1. Aluminum nitride in secondary aluminum ash and iron oxide in metal aluminum high-temperature reduced iron ore are fully utilized to produce metal iron, and simultaneously, aluminum oxide contained in the secondary aluminum ash and aluminum nitride in the secondary aluminum ash are utilized to react with iron ore powder to produce aluminum oxide, and quick lime is added to produce the pre-melting calcium aluminate for steelmaking with high added value through melting.
2. The heat value generated by oxidation reduction of the aluminum nitride and the iron oxide in the iron ore and the heat value generated by aluminothermic reaction of the metal aluminum and the iron oxide are fully utilized to simultaneously produce the calcium aluminate and the metal iron, thereby greatly reducing the energy consumption.
3. The method has the advantages that the metal iron is produced by utilizing the reducibility of aluminum nitride and aluminum, the aluminum oxide produced by reducing the metal iron and the original aluminum oxide in the secondary aluminum ash are mixed together with the quick lime and melted to obtain the calcium aluminate, the link of removing nitrogen from the secondary aluminum ash is omitted, the process of removing nitrogen by washing is not needed, and the pollution of ammonia gas, salt-containing wastewater and the like generated by hydrolysis of the aluminum nitride is avoided.
4. The characteristic of large density difference between calcium aluminate and metallic iron is utilized to realize the separation of the metallic iron and the calcium aluminate in a molten state, a melt adopts a slag-metal shunt casting solidification or casting-cooling method to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid, special separation equipment is not needed, and the production flow of the two products is simplified.
The invention has the beneficial technical effects that:
(1) Reducing iron oxide in the iron ore into metallic iron by using aluminum nitride and aluminum in the secondary aluminum ash, simultaneously oxidizing the aluminum nitride into aluminum oxide and nitrogen, and oxidizing the metallic aluminum into aluminum oxide, so that the product is pollution-free;
(2) The alumina, the aluminum nitride and the alumina generated by the reaction of the aluminum and the iron oxide in the secondary aluminum ash are used as the raw materials of the pre-molten calcium aluminate, so that high-value utilization is realized;
(3) The reducibility of the aluminum nitride is utilized to react with the iron oxide, a water washing nitrogen removal process is not needed, and the pollution of ammonia gas, salt-containing wastewater and the like generated by hydrolysis of the aluminum nitride is avoided;
(4) The oxidation-reduction reaction of the aluminum nitride and the aluminum and the iron oxide is an exothermic reaction, so that the heat value of the secondary aluminum ash is fully utilized for the synthesis of the calcium aluminate, and the energy-saving effect is obvious;
(5) The characteristic of large density difference between calcium aluminate and metallic iron is utilized, the metallic iron and the calcium aluminate are separated in a molten state, and special separation equipment is not needed;
(6) The needed quicklime and iron ore powder are bulk industrial raw materials, and the risk of raw material supply is avoided;
(7) The method has the advantages of short process flow, less investment of fixed assets and low cost, and realizes low-cost, green and high-value utilization of secondary aluminum ash hazardous wastes.
Drawings
FIG. 1 is a process flow diagram for preparing premelted calcium aluminate and metal by reducing iron ore with secondary aluminum ash.
FIG. 2 is a 1mol AlN reduction Fe 3 O 4 And Fe 2 O 3 The Gibbs free energy change of the reaction is along with the temperature change curve, wherein deltaG is the Gibbs free energy change and has the unit of kJ, and T is the temperature and has the unit of ℃.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
The following describes the implementation of the present invention in detail with reference to specific embodiments:
example 1
And mixing 31 parts of secondary aluminum ash, 45 parts of quicklime and 13 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1440 ℃ and is kept warm for 2.6h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 2
27 parts of secondary aluminum ash, 50 parts of quicklime and 22 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1590 ℃ and is kept for 1.1h, the iron oxide in the iron ore powder is reduced by the aluminum nitride and the aluminum to obtain molten metal iron, and the calcium oxide reacts with the alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 3
And mixing 25 parts of secondary aluminum ash, 52 parts of quicklime and 18 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1600 ℃ and is kept for 1.0h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 4
Mixing 50 parts of secondary aluminum ash, 42 parts of quicklime and 40 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1475 ℃ and is kept warm for 2.2h, the iron oxide in the iron ore powder is reduced by the aluminum nitride and the aluminum to obtain molten metallic iron, and the calcium aluminate is obtained by the reaction of the calcium oxide and the aluminum oxide. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 5
32 parts of secondary aluminum ash, 45 parts of quicklime and 15 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1565 ℃ and is kept warm for 1.3h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 6
48 parts of secondary aluminum ash, 29 parts of quicklime and 38 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1485 ℃ and is kept for 2.1h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 7
And mixing 41 parts of secondary aluminum ash, 36 parts of quicklime and 31 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1520 ℃ and is kept warm for 1.8h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 8
Mixing 38 parts of secondary aluminum ash, 39 parts of quicklime and 27 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1535 ℃ and is insulated for 1.6h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 9
27 parts of secondary aluminum ash, 49 parts of quicklime and 21 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1460 ℃ and is kept warm for 2.4h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 10
And mixing 30 parts of secondary aluminum ash, 47 parts of quicklime and 11 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1575 ℃ and is kept warm for 1.2h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 11
And mixing 25 parts of secondary aluminum ash, 51 parts of quicklime and 17 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. Heating the mixture to 1470 ℃, preserving the temperature for 2.3h, reducing iron oxide in iron ore powder by aluminum nitride and aluminum to obtain molten metallic iron, and reacting quicklime with alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 12
And mixing 31 parts of secondary aluminum ash, 46 parts of quicklime and 12 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1570 ℃ and is kept warm for 1.3h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 13
And mixing 28 parts of secondary aluminum ash, 48 parts of quicklime and 24 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1455 ℃ and is kept warm for 2.4h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metallic iron, and quicklime reacts with alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 14
And mixing 43 parts of secondary aluminum ash, 34 parts of quicklime and 33 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1510 ℃ and is kept for 1.9h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metal iron, and quicklime reacts with alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 15
30 parts of secondary aluminum ash, 46 parts of quicklime and 10 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1445 ℃ and is kept for 2.5 hours, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 16
49 parts of secondary aluminum ash, 28 parts of quicklime and 39 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1480 ℃ and is kept for 2.2h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 17
Mixing 38 parts of secondary aluminum ash, 38 parts of quicklime and 26 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1405 ℃ and is insulated for 2.9 hours, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 18
47 parts of secondary aluminum ash, 30 parts of quicklime and 37 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1490 ℃ and is kept warm for 2.1h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 19
And mixing 35 parts of secondary aluminum ash, 41 parts of quicklime and 21 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1420 ℃ and is kept warm for 2.8h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 20
36 parts of secondary aluminum ash, 41 parts of quicklime and 23 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1545 ℃ and is kept for 1.5h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 21
26 parts of secondary aluminum ash, 51 parts of quicklime and 20 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1595 ℃ and is kept warm for 1.0h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 22
And mixing 40 parts of secondary aluminum ash, 37 parts of quicklime and 30 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1525 ℃ and is kept warm for 1.7h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 23
And mixing 29 parts of secondary aluminum ash, 48 parts of quicklime and 26 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1580 ℃ and is kept warm for 1.2h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metallic iron, and quicklime reacts with alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 24
And mixing 39 parts of secondary aluminum ash, 38 parts of quicklime and 29 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1530 ℃ and is kept for 1.7h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 25
And mixing 29 parts of secondary aluminum ash, 47 parts of quicklime and 25 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1450 ℃ and is kept for 2.5h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 26
And mixing 33 parts of secondary aluminum ash, 43 parts of quicklime and 17 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1430 ℃ and is kept warm for 2.7h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metallic iron, and quicklime reacts with alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 27
And mixing 35 parts of secondary aluminum ash, 42 parts of quicklime and 20 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1550 ℃ and is kept warm for 1.5h, the aluminum nitride and the aluminum reduce iron oxides in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 28
26 parts of secondary aluminum ash, 50 parts of quicklime and 19 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1465 ℃ and is kept warm for 2.3h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 29
And mixing 37 parts of secondary aluminum ash, 40 parts of quicklime and 25 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1540 ℃ and is kept warm for 1.6h, the iron oxide in the iron ore powder is reduced by the aluminum nitride and the aluminum to obtain molten metallic iron, and the calcium oxide reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 30
And (3) mixing 34 parts of secondary aluminum ash, 42 parts of quicklime and 19 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1425 ℃ and is kept warm for 2.7h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 31
Mixing 36 parts of secondary aluminum ash, 40 parts of quicklime and 22 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1415 ℃ and is kept for 2.8h, the aluminum nitride and the aluminum reduce iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 32
And mixing 28 parts of secondary aluminum ash, 49 parts of quicklime and 23 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1585 ℃ and is kept warm for 1.1h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metallic iron, and quicklime reacts with alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 33
And mixing 46 parts of secondary aluminum ash, 31 parts of quicklime and 36 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1495 ℃ and is kept warm for 2.0h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 34
And mixing 44 parts of secondary aluminum ash, 33 parts of quicklime and 34 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1505 ℃ and is kept warm for 1.9h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 35
And (3) mixing 34 parts of secondary aluminum ash, 43 parts of quicklime and 18 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1555 ℃ and is kept warm for 1.4h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metallic iron, and quicklime reacts with alumina to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 36
And mixing 37 parts of secondary aluminum ash, 39 parts of quicklime and 24 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1410 ℃ and is kept warm for 2.9h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 37
42 parts of secondary aluminum ash, 35 parts of quicklime and 32 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1515 ℃ and is kept warm for 1.8h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metal iron and upper layer of pre-molten calcium aluminate, so as to realize slag-metal separation.
Example 38
And mixing 45 parts of secondary aluminum ash, 32 parts of quicklime and 35 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1500 ℃ and is kept warm for 2.0h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metal iron, and the quicklime reacts with the alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 39
And mixing 33 parts of secondary aluminum ash, 44 parts of quicklime and 16 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1560 ℃ and is kept warm for 1.4h, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Example 40
And mixing 39 parts of secondary aluminum ash, 37 parts of quicklime and 28 parts of iron ore powder to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1400 ℃ and is kept warm for 3.0h, aluminum nitride and aluminum reduce iron oxide in iron ore powder to obtain molten metallic iron, and quicklime reacts with alumina to obtain molten calcium aluminate. And (3) performing shunt casting and solidification on the melt by using slag metal to respectively obtain a metallic iron solid and a pre-molten calcium aluminate solid.
Example 41
32 parts of secondary aluminum ash, 44 parts of quicklime and 14 parts of iron ore powder are mixed to obtain a mixture with the nonuniformity of less than or equal to 5.0%. The mixture is heated to 1435 ℃ and is kept warm for 2.6 hours, the aluminum nitride and the aluminum reduce the iron oxide in the iron ore powder to obtain molten metallic iron, and the quicklime and the alumina react to obtain molten calcium aluminate. The melt is cast and cooled to obtain solid with lower layer of metallic iron and upper layer of pre-molten calcium aluminate, so as to realize slag-gold separation.
Claims (3)
1. A method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash is characterized by comprising the following steps:
(1) Preparing materials: proportioning and mixing the secondary aluminum ash, the quicklime and the iron ore powder to obtain a uniform mixture;
the mixture ratio of the step (1) is 25-50 parts of secondary aluminum ash, 28-52 parts of quicklime and 10-40 parts of iron ore powder; after the proportioned materials are mixed, the nonuniformity of the mixture is less than or equal to 5.0 percent;
(2) Melting: heating and melting the mixture, reducing iron ore powder by aluminum nitride and aluminum in the secondary aluminum ash to obtain metallic iron, and reacting quick lime with alumina to obtain calcium aluminate;
heating the mixture to 1400-1600 ℃ by melting in the step (2), preserving heat for 1.0-3.0h, reducing iron ore powder by aluminum nitride and aluminum in secondary aluminum ash to obtain metallic iron, and reacting quick lime with alumina to obtain calcium aluminate;
(3) Separating slag and gold: and separating and cooling the molten metallic iron and the calcium aluminate to obtain the metallic iron and the pre-molten calcium aluminate.
2. The method for preparing pre-molten calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash according to claim 1, wherein the slag-metal separation in step (3) is performed by a casting-cooling method, the metallic iron is solidified at a lower part of the casting mold in a high density, and the calcium aluminate is solidified at an upper part of the casting mold in a low density, so that the metallic iron and the pre-molten calcium aluminate are separated.
3. The method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash according to claim 1, wherein the slag-metal separation in step (3) is performed by slag-metal shunt casting solidification to obtain metallic iron and premelted calcium aluminate, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111406602.3A CN114150098B (en) | 2021-11-24 | 2021-11-24 | Method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111406602.3A CN114150098B (en) | 2021-11-24 | 2021-11-24 | Method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114150098A CN114150098A (en) | 2022-03-08 |
| CN114150098B true CN114150098B (en) | 2022-10-25 |
Family
ID=80457875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111406602.3A Active CN114150098B (en) | 2021-11-24 | 2021-11-24 | Method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114150098B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115818968A (en) * | 2022-08-30 | 2023-03-21 | 湖南锐异资环科技有限公司 | Resource utilization method of secondary aluminum ash |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5865872A (en) * | 1995-06-26 | 1999-02-02 | Fenicem Minerals Inc. | Method of recovering metals and producing a secondary slag from base metal smelter slag |
| JPH1053820A (en) * | 1996-08-12 | 1998-02-24 | Asahi Giken Hanbai Kk | Treatment of metal compounds of steel dust, sludge and/ or ore |
| JP3832953B2 (en) * | 1997-12-25 | 2006-10-11 | 太平洋セメント株式会社 | Irwin manufacturing method |
| CN101429582B (en) * | 2008-12-04 | 2010-06-16 | 武汉科技大学 | Method for producing ferro-silicon alloy and calcium aluminate material with red mud and aluminum ash |
| CN109265029B (en) * | 2018-10-11 | 2020-10-09 | 清华大学 | Method for preparing alloy iron and cement material |
| CN110563336A (en) * | 2019-10-23 | 2019-12-13 | 北京科技大学 | Method for preparing microcrystalline glass by aluminum ash without desalting and removing nitrogen |
| CN112958584B (en) * | 2021-01-25 | 2022-05-24 | 北京科技大学 | Method for reducing dangerous solid waste heavy metal by using secondary aluminum ash and utilizing molten slag |
-
2021
- 2021-11-24 CN CN202111406602.3A patent/CN114150098B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114150098A (en) | 2022-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108585826B (en) | Method for preparing magnesium aluminate spinel by using secondary aluminum ash | |
| CN109928414B (en) | Method for synchronously preparing calcium aluminate steelmaking desulfurizer by removing impurities through aluminum ash sintering | |
| CN112111660B (en) | Method for enriching lithium from lithium ore and preparing ferro-silicon alloy and recycling aluminum oxide | |
| SK279299B6 (en) | Process for producing cement out of metallurgic slag | |
| CN101837435A (en) | Method for preparing casting covering slag by utilizing stainless steel cold-rolling pickling wastewater | |
| CN110317951A (en) | A method of nichrome is produced using dedusting ash of stainless steel and pickling sludge | |
| CN101353177A (en) | Method for producing calcium hexaluminate with waste aluminum ash | |
| CN110282877B (en) | Thermal insulation cotton prepared from ironmaking hot slag and waste incineration fly ash and preparation method thereof | |
| CN112680564B (en) | Method for preparing calcium aluminate steelmaking desulfurizer by melting high magnesium aluminum ash | |
| CN110482503A (en) | A kind of method of Quadratic aluminum dust comprehensive utilization of resources | |
| US10703675B2 (en) | Method for processing steel slag and hydraulic mineral binder | |
| CN114150098B (en) | Method for preparing premelted calcium aluminate and metallic iron by reducing iron ore with secondary aluminum ash | |
| CA2148226A1 (en) | Process for making steel and hydraulically active binders | |
| CN103343179B (en) | Converter steelmaking synthetic slag former | |
| CN115710634A (en) | Method for treating sintering dust removal ash and waste coating of continuous casting tundish | |
| CN103343180B (en) | Preparation method of converter steelmaking synthetic slag former | |
| CN113913619A (en) | Method for efficiently removing nitrogen from secondary aluminum ash and preparing premelted calcium aluminate refining agent | |
| CN111534661B (en) | High-magnesium vanadium slag pretreatment method based on magnesium roasting | |
| KR101469678B1 (en) | Low carbon-metal manganese and low carbon-ferromanganese manufacturing method by using continuous thermit reaction | |
| CN114292969A (en) | Method for co-processing waste incineration fly ash by blast furnace ironmaking | |
| Pal et al. | Utilisation of LD slag–An overview | |
| JPH0375615B2 (en) | ||
| KR101153887B1 (en) | Preparation method for alkaline calciumferrite flux for steelmaking | |
| CN109706327A (en) | A kind of method of harmlessness disposing beryllium slag | |
| CN115386685B (en) | Harmless treatment method for converter production synergistic chromium slag and electrolytic aluminum carbon slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |