WO2022156076A1 - Procédé pour produire de l'oxyde d'aluminium à l'aide d'une technologie de métallurgie des scories - Google Patents

Procédé pour produire de l'oxyde d'aluminium à l'aide d'une technologie de métallurgie des scories Download PDF

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WO2022156076A1
WO2022156076A1 PCT/CN2021/086846 CN2021086846W WO2022156076A1 WO 2022156076 A1 WO2022156076 A1 WO 2022156076A1 CN 2021086846 W CN2021086846 W CN 2021086846W WO 2022156076 A1 WO2022156076 A1 WO 2022156076A1
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slag
molten
iron
bauxite
vanadium
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PCT/CN2021/086846
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English (en)
Chinese (zh)
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张力
张永玲
邹鑫
张伟
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东北大学
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Publication of WO2022156076A1 publication Critical patent/WO2022156076A1/fr

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    • 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
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/006—Starting from ores containing non ferrous metallic oxides
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/008—Use of special additives or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • 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
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

Definitions

  • the invention belongs to the technical fields of comprehensive utilization of aluminum-containing mineral resources, slag metallurgy and alumina production, and particularly relates to a method for producing alumina by utilizing slag metallurgy technology.
  • the raw material is high-grade bauxite (aluminum-silicon ratio>7), and it is impossible to utilize low-grade bauxite, high iron bauxite, fly ash, coal gangue, nepheline, alum, clay, kaolin and other bauxite resources;
  • Red mud contains harmful components such as sodium and radioactive elements, which are difficult to utilize, and hundreds of millions of tons have been accumulated;
  • the acid method-alkali method has high acid consumption, high cost, long process, and large environmental pollution
  • Magnetic separation technology which covers a large area, has a low yield of iron components, cannot eliminate red mud and recover valuable components such as chromium and vanadium;
  • Direct reduction-melting separation technology (CN201510531320.4, CN201510530645.0, CN201810593292.2, CN201910888430.4, CN201910909622.9), there are only suitable for high iron bauxite, high reduction temperature, high energy consumption, CaO flux Disadvantages such as large consumption, high cost, complex equipment, and difficulty in continuous operation;
  • Blast furnace ironmaking technology (CN201410048304.5), high recovery rate, has disadvantages such as only suitable for high iron bauxite, high energy consumption, long process, large investment, large consumption of CaO flux, high cost, large environmental pollution, etc. State restricted craftsmanship.
  • the raw materials have strong adaptability, not only can process bauxite with high aluminum-silicon ratio, but also bauxite with low aluminum-silicon ratio, high-iron bauxite, polymetallic symbiotic ore, high-aluminum fly ash, high-alumina Aluminum ore resources such as coal gangue and nepheline;
  • tailings, tailings or red mud can be directly used to prepare high value-added products, which are environmentally friendly, the whole process can be recycled, and has the characteristics of green, clean and efficient;
  • Valuable components such as iron, chromium, vanadium, phosphorus, niobium, CaO, SiO can be recovered at the same time, and the income is high;
  • Ferromanganese smelting and magnesium smelting slag are produced in ferromanganese smelting ferroalloy process and metal magnesium smelting process respectively.
  • Ferromanganese smelting slag, magnesium smelting slag, molten steel slag and blast furnace slag belong to the high calcium oxide slag system, which contains a large amount of molten CaO, Al 2 O 3 and SiO 2 and other valuable components. More than 600 million tons, cannot be processed or have low added value, and accumulate in large quantities, wasting physical heat and resources.
  • the present invention provides a method for producing alumina by utilizing slag metallurgy technology, the specific method comprising: mixing bauxite, alkaline flux, reducing agent, or bauxite and reducing agent,
  • the main product is calcium aluminate slag
  • the by-product is molten iron or vanadium-containing molten iron or vanadium-chromium-containing molten iron.
  • the invention utilizes the high physical heat and chemical activity of high calcium oxide metallurgical slag (melting steel slag, blast furnace slag, ferromanganese smelting slag and magnesium smelting slag), slag bath melting reduction treatment of aluminum ore, and obtains calcium aluminate slag (aluminum smelting slag).
  • Acid slag, ultra-high basicity slag (CaO/SiO 2 ⁇ 3) mainly composed of ore phases such as hepta-alumina, calcium aluminate, etc.
  • vanadium-containing molten iron self-pulverized calcium aluminate slag after wet Alumina is produced by the method of metallurgical technology.
  • Calcium aluminate slag and alumina are the main products, and the by-product is molten iron. It has the characteristics of strong adaptability of raw materials, low energy consumption, low consumption of flux CaO, multi-component recovery, no solid waste discharge, short process, low cost and environmental friendliness. It is a new alumina production method, which can achieve high oxidation Recovery and production of aluminium components in calcium metallurgical slag and bauxite.
  • a method for producing alumina by utilizing slag metallurgy technology of the present invention comprises the following steps;
  • step 1
  • the high calcium oxide metallurgical slag is added to the melting reactor to form reaction slag; the mass percentage of CaO in the high calcium oxide metallurgical slag is ⁇ 30%, which is directly obtained from the metallurgical furnace, and the slag temperature is ⁇ 1100 °C;
  • the chemical composition of the molten slag in the molten state is regulated, so that the molten slag in the molten state satisfies the following two conditions at the same time:
  • the lower layer of molten iron is directly used as the raw material for steelmaking, and after steelmaking, the obtained molten steel slag is directly returned to step 1 to enter the melting reactor;
  • the alkaline flux is one or both of limestone and lime.
  • the high calcium oxide metallurgical slag is one or more of molten steel slag, blast furnace slag, ferromanganese smelting slag, and magnesium smelting slag.
  • the melting reactor is one of an electric furnace, a submerged arc furnace, an electric arc furnace, a short blast furnace, an induction furnace, a smelting reduction furnace, a thermal insulation slag bag, and a thermal insulation pit, and the smelting reduction temperature is 1400 °C. ⁇ 1650°C.
  • the bauxite is bauxite, high iron bauxite (mass percentage content of all Fe>20%), pre-reduced iron-containing bauxite pellets, fly ash, coal gasification.
  • slag coal gangue, nepheline, alum, clay, kaolinite, bauxite, feldspar, shale, and red mud.
  • the bauxite When the bauxite contains crystal water, it needs to be dried and dehydrated in advance, and the drying temperature is less than 600°C.
  • bauxite is powdery or spherical, and is directly added or sprayed into the reaction slag, and the gas for spraying bauxite is preferably nitrogen and/or oxidizing gas; the oxidizing gas is air, oxygen-enriched air One or more of , oxygen and CO 2 .
  • the reducing agent is one or more of anthracite, bituminous coal, lignite, pulverized coal, natural gas, coalbed methane, and coal gas, and the solid reducing agent in the reducing agent is directly added or added by injection
  • the gas for spraying the solid reducing agent is preferably nitrogen and/or oxidizing gas; the oxidizing gas is one or more of air, oxygen-enriched air, oxygen, and CO 2 .
  • the oxidizing gas is one or more of air, oxygen-enriched air, oxygen, and CO 2 .
  • the slag bath smelting reduction process is: the process of reducing iron oxides in the raw material to iron, and the reduction rate of iron oxides to metallic iron is ⁇ 90%.
  • the chromium, vanadium and niobium in the raw materials all enter the molten iron; the phosphorus component enters the calcium aluminate slag and soot, and the soot is the flue gas generated by the smelting reduction of the slag.
  • the molten iron is one of ordinary molten iron, vanadium-containing molten iron, niobium-containing molten iron, and vanadium-chromium-containing molten iron.
  • step 3 when the lower layer of molten iron is vanadium-containing molten iron, niobium-containing molten iron, and vanadium-chromium-containing molten iron, first, after vanadium-chromium-niobium steelmaking is carried out, semi-steel and slag are obtained, and the slag is vanadium slag, niobium slag, vanadium slag, vanadium slag, vanadium slag, vanadium slag, vanadium slag.
  • the chromium slag the molten steel slag obtained after semi-steel steelmaking is directly returned to step 1 into the melting reactor.
  • the leaching residue is used as the raw material for cement production.
  • the cooling method of the upper layer calcium aluminate slag is natural air cooling or cooling with the furnace.
  • the Na 2 CO 3 solution is preferably a solution with a mass concentration of 70 to 110 g/L, and the leaching temperature is 70 to 110° C.
  • the Na 2 CO 3 solution: self-pulverizing calcium aluminate Slag (3 ⁇ 11)mL: 1g, the leaching time is 90 ⁇ 120min.
  • the basic principle of a method for producing alumina by utilizing slag metallurgy technology of the present invention is:
  • the slag bath smelting reduction technology has the characteristics of reducing production energy consumption, reducing the consumption of flux CaO, eliminating the production of red mud, meeting the raw material requirements of different bauxite, low production cost and environmental friendliness, etc.
  • Aluminum technology has vitality and promotion value;
  • the SiO contained in it will react with NaOH and consume NaOH, and the present invention adopts the ultra-high basicity by utilizing the high content of CaO in the high-calcium oxide metallurgical slag.
  • the dicalcium silicate slag forming technology realizes high calcium oxide metallurgical slag High value-added utilization.
  • a method for producing alumina by utilizing slag metallurgy technology of the present invention has the following beneficial effects:
  • the raw materials have strong adaptability, not only can process bauxite with high, medium and low ratio of aluminum to silicon, but also can process aluminum such as high iron bauxite, fly ash, coal gangue, nepheline, clay, kaolin, red mud, etc. mineral resources;
  • the valuable components such as iron, chromium, vanadium, phosphorus, niobium, CaO, Al 2 O 3 , SiO 2 in the metallurgical slag containing aluminum-containing minerals and high calcium oxide are recovered to realize the metallurgical melting of aluminum-containing minerals and high calcium oxide. Efficient and high-value utilization of slag, and can also process red mud;
  • (9) is a new alumina production method, and also an iron-making method
  • FIG. 1 is a schematic process flow diagram of a method for producing alumina by utilizing slag metallurgy technology according to the present invention.
  • FIG. 1 A method for producing alumina by utilizing slag metallurgy technology is shown in Fig. 1 for its schematic flow diagram, and specifically includes the following steps:
  • Step 1 The ferromanganese smelting slag is used as the reaction slag, and the dried and dehydrated high-grade bauxite (A/S>6), pulverized coal and limestone are added to the submerged arc furnace, and the molten state is maintained.
  • Carbon dioxide is sprayed into the molten slag to carry out slag bath melting reduction
  • the dry and dehydrated high-grade bauxite and pulverized coal are injected into the submerged arc furnace by carbon dioxide injection;
  • Step 2 After the slag bath is smelted and reduced, the slag and iron are separated to obtain the lower layer of vanadium-containing molten iron and the upper layer of calcium aluminate slag;
  • Step 3 The vanadium-containing molten iron in the lower layer is used as the raw material for vanadium extraction and steelmaking to obtain vanadium slag and semi-steel. After semi-steel steelmaking, molten steel slag is obtained, and the molten steel slag is directly returned to the submerged arc furnace in step 1 as reaction slag. ;
  • the leaching condition is that the mass concentration of Na 2 CO 3 is 70 g/L, and the leaching condition is as follows: The temperature is 110°C, according to the liquid-
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 , iron and vanadium components in ferromanganese smelting slag and high-grade bauxite are 95%, 86%, 93%, 95% and 80%, respectively. %.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • the oxygen-enriched air is sprayed into the molten slag, and the slag bath is melted and reduced;
  • Step 2 After the slag bath is smelted and reduced, the slag and iron are separated, and the chromium and vanadium in the raw materials enter the lower layer to obtain the lower layer of vanadium-containing chromium molten iron and the upper layer of calcium aluminate slag; the phosphorus component enters the calcium aluminate slag and soot, and the soot is Flue gas produced by slag smelting reduction.
  • Step 3 The lower layer of vanadium-chromium-containing molten iron is used as the raw material for vanadium extraction and steelmaking to obtain vanadium-chromium slag and semi-steel. After the semi-steel is made, molten steel slag is obtained, and the molten steel slag is directly returned to the electric furnace in step 1 and used as a reaction molten steel. slag;
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 , iron, chromium, and vanadium components in magnesium smelting slag and high iron bauxite are 96%, 88%, 94%, 96%, and 81%, respectively. with 83%.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 2 After the slag bath is melted and reduced, the slag and iron are separated, and the niobium in the raw material enters the lower layer to obtain the lower layer of niobium-containing molten iron and the upper layer of calcium aluminate slag, and the phosphorus component enters the calcium aluminate slag and soot respectively;
  • Step 3 The niobium-containing molten iron in the lower layer is used as the raw material for niobium steelmaking to obtain niobium slag and semi-steel. After semi-steel steelmaking, molten steel slag is obtained, and the molten steel slag is directly returned to the smelting reduction furnace in step 1 as reaction slag. ;
  • the leaching condition is that the mass concentration of Na 2 CO 3 is 80 g/L, and the leaching temperature is 90 °C, according to the liquid-solid ratio, Na 2 CO 3 solution: self-pulverizing calcium aluminate
  • the recovery rates of the components of CaO, Al 2 O 3 , SiO 2 , iron and niobium in the converter molten steel slag and blast furnace slag, low-grade bauxite and high-grade bauxite are 94%, 86%, 93%, 97% and 82%.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 1 The converter molten steel slag is used as the reaction slag, and the dried and dehydrated low-grade bauxite (A/S ⁇ 6), high-grade bauxite (A/S>6), lime and lignite are added to the thermal insulation slag.
  • Hot air is blown into the molten slag to perform slag bath melting reduction.
  • Step 2 after the slag bath is smelted and reduced, the slag and iron are separated to obtain the lower layer of vanadium-containing molten iron and the upper layer of calcium aluminate slag phase;
  • Step 3 The lower layer of vanadium-containing molten iron is used as the raw material for vanadium extraction and steelmaking to obtain vanadium slag and semi-steel. After semi-steel steelmaking, molten steel slag is obtained. slag;
  • the leaching condition is that the mass concentration of Na 2 CO 3 is 100 g/L, and the leaching temperature is 110 °C, according to the liquid-solid ratio, Na 2 CO 3 solution: self-pulverizing calcium aluminate
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 , iron, and vanadium components in the converter molten steel slag and bauxite are 97%, 90%, 95%, 94%, and 85%, respectively.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 1 The electric furnace molten steel slag is used as the reaction slag, and the dried and dehydrated high iron bauxite (total Fe>20%), fly ash, lime and lignite are added to the electric arc furnace, and the pre-reduced iron-bearing bauxite is added.
  • Hot air is sprayed into the molten slag to carry out slag bath melting reduction
  • Step 2 after the slag bath is smelted and reduced, the slag and iron are separated, and the vanadium in the raw material enters the lower layer of molten iron to obtain the lower layer of vanadium-containing molten iron and the upper layer of calcium aluminate slag;
  • Step 3 The lower layer of vanadium-containing molten iron is used as the raw material for vanadium extraction and steelmaking to obtain vanadium slag and semi-steel. After the semi-steel is made, molten steel slag is obtained, and the molten steel slag is directly returned to the electric arc furnace in step 1 and used as reaction slag ;
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 , iron and vanadium components in the electric furnace molten steel slag, high-speed iron bauxite and fly ash are 95%, 91%, 95%, 95% and 86%. %.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 2 After the slag bath is melted and reduced, the slag and iron are separated to obtain the lower layer of vanadium-containing molten iron and the upper layer of calcium aluminate slag;
  • Step 3 vanadium-containing molten iron is used as a raw material for vanadium extraction and steelmaking to obtain vanadium slag and semi-steel, and after semi-steel steelmaking, molten steel slag is obtained, and the molten steel slag is directly returned to the short blast furnace in step 1 as reaction slag;
  • Step 4 After the calcium aluminate slag is air-cooled to room temperature, the self-pulverized calcium aluminate slag is obtained, and the self-pulverized calcium aluminate slag is obtained (the leaching conditions are: the mass concentration of Na 2 CO 3 is 110 g/L, and the leaching temperature is 110° C.
  • the recovery rates of the components of electric furnace molten steel slag, high - speed iron bauxite (total Fe> 20 %), and coal gangue are 94%, 86%, 93%, 93% and 83%.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 1 The molten steel slag of the electric furnace is used as the reaction slag, and the dried and dehydrated high-speed iron bauxite (total Fe>20%), coal gangue and lime are added to the smelting reduction furnace, and the molten state is maintained.
  • Step 2 after the slag bath is smelted and reduced, the slag and iron are separated to obtain the lower layer of vanadium-containing molten iron and the upper layer of calcium aluminate slag phase;
  • Step 3 vanadium-containing molten iron is used as a raw material for vanadium-smelting steelmaking, to obtain vanadium slag and semi-steel, and after semi-steel steelmaking, molten steel slag is obtained, and the molten steel slag is directly returned to the melting reduction furnace in step 1 as reaction slag;
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 , iron, chromium, vanadium, and niobium components in electric furnace molten steel slag, high-speed iron bauxite, and coal gangue are 97%, 94%, 96%, and 96%, respectively. 97% and 85%.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 1 The converter molten steel slag is used as the reaction slag, and the dried and dehydrated clay, kaolin, bauxite, feldspar, and lime are added to the thermal insulation slag bag, and the molten state is maintained.
  • Step 2 after the slag bath is melted and reduced, the slag and iron are separated to obtain the lower layer of molten iron and the upper layer of calcium aluminate slag phase;
  • Step 3 molten iron is used as a raw material for steelmaking to obtain molten steel slag, and the molten steel slag is directly returned to the thermal insulation slag bag in step 1 as reaction slag;
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 and iron components in converter molten steel slag, clay, kaolin, bauxite and feldspar are 97%, 92%, 96% and 97%.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 2 after the slag bath is smelted and reduced, the slag and iron are separated to obtain the lower layer of vanadium-containing molten iron and the upper layer of calcium aluminate slag phase;
  • Step 3 Vanadium-containing molten iron is used as the raw material for vanadium steelmaking to obtain vanadium slag and semi-steel. After the semi-steel is made, molten steel slag is obtained. slag;
  • the leaching conditions are: the Na 2 CO 3 mass concentration is 80 g/L, and the leaching temperature is 80 °C, according to the liquid-solid ratio, Na 2 CO 3 solution: self-pulverizing calcium aluminate s
  • the recovery rates of CaO, Al 2 O 3 , SiO 2 , iron and vanadium components in converter molten steel slag, high-grade bauxite, nepheline and alum are 96%, 88%, 95%, 94%, respectively. % and 82%.
  • a method for producing alumina by utilizing slag metallurgy technology comprising the following steps:
  • Step 2 after the slag bath is melted and reduced, the slag and iron are separated to obtain the lower layer of vanadium-chromium molten iron and the upper layer of calcium aluminate slag phase;
  • Step 3 Vanadium-chromium molten iron is used as the raw material for vanadium-chromium steelmaking to obtain vanadium-chromium slag and semi-steel. After the semi-steel is made, molten steel slag is obtained, and the molten steel slag is directly returned to the induction furnace in step 1 as a reaction slag;
  • Step 4 After the calcium aluminate slag is air-cooled to room temperature, the self-pulverized calcium aluminate slag is obtained, and the self-pulverized calcium aluminate slag is obtained (the leaching conditions are: the mass concentration of Na 2 CO 3 is 100 g/L, and the leaching temperature is 90° C.
  • the recovery rates of the components of CaO, Al 2 O 3 , SiO 2 , iron, chromium, and vanadium in the converter molten steel slag and high-grade bauxite are 96%, 80%, 96%, 95%, 82%, respectively. % and 81%.

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Abstract

La présente invention concerne un procédé pour produire de l'oxyde d'aluminium à l'aide d'une technologie de métallurgie des scories, se rapportant au domaine de l'utilisation complète de ressources minérales contenant de l'aluminium, de la métallurgie des scories et de la production d'oxyde d'aluminium. Le procédé comprend : l'ajout de scories métallurgiques à haute teneur en oxyde de calcium, d'un minerai d'aluminium, d'un agent réducteur et d'un composant dans un réacteur de fusion, le maintien d'un état fondu et le compoundage, dans les scories, les relations suivantes étant satisfaites : le rapport molaire du CaO à l'Al2O3 étant supérieur à 1,6 ; le rapport de masse du CaO au SiO2 étant de 3,0 à 5,0 ; l'insufflation d'un gaz oxydant et la réalisation d'une réduction à l'état fondu du bain de scories ; après la réduction, la réalisation d'une séparation des scories et du fer pour obtenir un fer liquide au niveau de la couche inférieure, la réalisation de l'élaboration de l'acier sur celui-ci pour obtenir les scories d'acier fondu et son renvoi vers le réacteur de fusion ; et le refroidissement des scories d'aluminate de calcium au niveau de la couche supérieure, l'ajout d'une solution de Na2CO3, l'introduction du CO2 pour obtenir de l'Al(OH)3 et sa calcination pour obtenir de l'oxyde d'aluminium. Le procédé présente les caractéristiques d'une forte adaptabilité des matières premières, d'une faible consommation d'énergie, d'une consommation de CaO à faible flux, d'une récupération de composants multiples, d'une absence d'évacuation de déchets solides, d'un processus court, d'un coût faible, d'un respect de l'environnement, etc., et réalise la récupération et la production de composants d'aluminium dans les scories métallurgiques à haute teneur en oxyde de calcium et le minerai d'aluminium.
PCT/CN2021/086846 2021-01-21 2021-04-13 Procédé pour produire de l'oxyde d'aluminium à l'aide d'une technologie de métallurgie des scories WO2022156076A1 (fr)

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CN114480745A (zh) * 2022-01-29 2022-05-13 北京工业大学 一种利用煤气化渣回收钢渣中铁的方法
CN115159552B (zh) * 2022-07-04 2024-01-26 重庆大学 一种从含铝资源中回收氧化铝的方法
CN115301716B (zh) * 2022-10-08 2023-01-17 淄博益海环保科技有限公司 赤泥、粉煤灰、钢渣、煤矸石固废资源化综合利用工艺

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