CN108998610A - A kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite - Google Patents

A kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite Download PDF

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CN108998610A
CN108998610A CN201810620789.9A CN201810620789A CN108998610A CN 108998610 A CN108998610 A CN 108998610A CN 201810620789 A CN201810620789 A CN 201810620789A CN 108998610 A CN108998610 A CN 108998610A
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iron
constituent element
bauxite
aluminium
comprehensive reutilization
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黄伟军
刘亚静
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Hebei University of Engineering
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
    • 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
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0086—Conditioning, transformation of reduced iron ores
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • 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
    • C22B21/0038—Obtaining aluminium by other processes
    • C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a kind of methods of constituent element comprehensive reutilization valuable in high-iron bauxite, belong to field of metallurgy, are smelted using microwave heating, tunnel oven.The present invention can be such that iron, aluminium element in high-iron bauxite is efficiently separated, improve the grade and recovery rate of iron, isolated low-sulfur sponge grease iron can be used for Magnetite (processed) or steelmaking feed, the high alumina tailings generated simultaneously is recycled, high alumina tailings can be used for the smelting of aluminium, promote the smelting of idle high-iron bauxite, the situation of iron ore, bauxite resource anxiety has been effectively relieved, take into account " resource+energy " ecology characteristic, the comprehensive utilization for realizing high-iron bauxite resource has many advantages, such as that simple process, production cost be low, energy-saving and emission-reduction.

Description

A kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite
Technical field
The present invention relates to metallurgical slag comprehensive utilization of resources, especially a kind of processing method of high-iron bauxite belongs to metallurgy Field.
Background technique
Iron and aluminium are the important raw materials of Chinese national economy development, and steel and iron industry and aluminum oxide industry are all important base Plinth industry, however China's iron ore and bauxitic ore resource are relatively barren, external dependence degree is continuously increased, according to the relevant information China's pig iron yield in 2017 is 71075.9 ten thousand tons, iron ore imports amount up to 10.75 hundred million tons, the ore percentage of import up to 70% with On；Aluminium yield is 792.2 ten thousand tons, and aluminum ore import volume is up to 55,820,000 tons or more, and the ore percentage of import is up to 46% or more.High-speed rail aluminium For Tu Kuang on China Guangxi, Yunnan, Hainan, Guangdong, Henan and other places, reserves contain higher Fe at 1,500,000,000 tons or more in mine2O3With Al2O3, there is huge economic value.
It is directed to a variety of high-iron bauxite comprehensive utilization process at present, can generally be summarized as " first select after smelting method ", " iron after first aluminium Method " and " aluminium method after first iron " scheme.This three kinds of schemes can complete the separation of Iron In Iron-rich Containing Bauxite and aluminium to a certain extent, But first two scheme all fails the flood rate for reaching preferable iron recovery and aluminium oxide；Although and latter scheme can reach compared with Good iron recovery and aluminium oxide flood rate, but because high cost, high energy consumption and environmental pollution is serious cannot be generalized to industry In production.Up to the present there has been no a kind of methods of iron, aluminium in effectively recycling high-speed rail aluminium ore.Therefore, how efficient sharp It with high-iron bauxite is of great significance to the situation alleviating China's iron ore, being becoming tight bauxite resource day.
Iron aluminium separating method is difficult to be selected with General Physics due to the embedding cloth gluing of Iron In Iron-rich Containing Bauxite aluminium, close symbiosis Mine method realizes the separation of iron aluminium；Iron processes is also smelting method after first leaching after first aluminium, first leaches the aluminium stone for being easy to leach in ore, then will Rich iron red mud is smelted, but this method not only Al2O3Leaching rate is low, and alkaline consumption is high, at the same alkali addition and residual give postorder iron ore The blast furnace ironmaking of stone brings certain difficulty, and iron processes not can solve the development and utilization problem of high-iron bauxite after first aluminium； Aluminium method is primarily referred to as fire concentrate iron and aluminium after first iron, is able to achieve the recovery rate of iron, 90% or more aluminium, but its major defect is High-iron bauxite sintering is difficult, while high-iron bauxite sinter reproducibility is poor, and blast furnace smelting process heavy dependence is burnt Charcoal, coke ratio is big compared with ordinary blast, cannot achieve industrial applications and implementation.
It would therefore be highly desirable to carry out a kind of research for effectively recycling the method for iron, aluminium in high-speed rail aluminium ore, to reach efficiently using high The purpose of ferrallite mine is of great significance to the situation alleviating China's iron ore, being becoming tight bauxite resource day.
Summary of the invention
The technical problem to be solved by the invention is to provide constituent element comprehensive reutilizations valuable in a kind of high-iron bauxite Method can be such that the iron in high-iron bauxite, aluminium element is efficiently separated, and improve the grade and recovery rate of iron, separate To low-sulfur sponge grease iron can be used for Magnetite (processed) or steelmaking feed, while the tailings generated is recycled, and tailings can For the smelting of aluminium, the smelting of idle high-iron bauxite is promoted, the situation of iron ore, bauxite resource anxiety has been effectively relieved, it is simultaneous " resource+energy " ecology characteristic is cared for, the comprehensive utilization of high-iron bauxite resource is realized, there is simple process, production cost The advantages that low, energy-saving and emission-reduction.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite is smelted using microwave heating, tunnel oven.
Technical solution of the present invention further improvement lies in that the following steps are included:
A. mixing: miberal powder, reducing agent, modification agent are added in batch mixer, mixed.
B. the reduction of ferriferous oxide: the powder after mixing is packed into tunnel oven, is heated and is kept the temperature, by the oxide of iron Reduction.
C. separate metal sponge iron: after reduction, magnetic separation separation obtains metal sponge iron and high alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Technical solution of the present invention further improvement lies in that: miberal powder is slow-witted mine high-iron bauxite powder, granularity≤100 mesh.
Technical solution of the present invention further improvement lies in that: reducing agent be low-sulfur coal or coke breeze, additional amount be miberal powder it is total The 10~20% of quality, granularity≤100 mesh.
Technical solution of the present invention further improvement lies in that: modification agent be calcium oxide or barium monoxide, additional amount be miberal powder it is total The 5~15% of quality, granularity≤100 mesh.
Technical solution of the present invention further improvement lies in that: in step B, heating temperature is 1000~1200 DEG C, when heat preservation Between be 0.5~1 hour.
Technical solution of the present invention further improvement lies in that: in step C magnetic separation separate magnetic induction intensity be 1~2T.
Technical solution of the present invention further improvement lies in that: magnetic separation separation after metal sponge iron as steel-making or Magnetite (processed) Raw material, high alumina tailings is as the raw material for smelting aluminium.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
The method of valuable constituent element comprehensive reutilization, can make high ferrallite in a kind of high-iron bauxite provided by the invention Iron, aluminium element in mine are efficiently separated, and improve the grade and recovery rate of iron, isolated low-sulfur sponge grease iron can For Magnetite (processed) or steelmaking feed, while the tailings generated is recycled, and tailings can be used for the smelting of aluminium, promote the spare time The situation of iron ore, bauxite resource anxiety has been effectively relieved in the smelting for setting high-iron bauxite, takes into account " resource+energy " ecology spy Color realizes the comprehensive utilization of high-iron bauxite resource, has many advantages, such as that simple process, production cost be low, energy-saving and emission-reduction.
The present invention restores the oxide of Iron In Iron-rich Containing Bauxite to obtain metal sponge iron using microwave heating technique, then Separation metal sponge iron is carried out using magnetic separation.Using oxides-containing iron in high-iron bauxite and between wave-sucking performance containing aluminum oxide Difference, high-iron bauxite is heated using microwave, is conducive to oxides-containing iron and other oxidation shapes in high-iron bauxite At intercrystalline crack, facilitate the dissociation of oxides-containing iron, promotes the reduction of iron；Simultaneously through calcium oxide or barium monoxide desulfurization, tunnel Kiln is smelted, and be can be continuously produced the metal sponge iron of low-sulfur high quality, be can reach the mesh of separation and concentration metal sponge iron through magnetic separation 's.When microwave heating is to 1000~1200 DEG C, keeps the temperature 0.5~1 hour, Iron grade is up to 90% or more in metal sponge iron, Iron recovery is up to 80% or more.Entire reaction process homogeneous heating, heating speed are fast, not only shorten heating and soaking time And the discharge for accelerating reaction rate, reducing pollutant, have that simple production process, equipment investment be few, high production efficiency, energy conservation The advantage of environmental protection.
The present invention joined modification agent and reducing agent in the reduction of ferriferous oxide, when modification agent be calcium oxide or barium monoxide, Additional amount is the 5~15% of miberal powder gross mass, when granularity≤100 mesh, can effectively remove the sulphur in iron, obtain low-sulfur sponge iron, It can be used for Magnetite (processed) or steelmaking feed.When reducing agent is low-sulfur coal or coke breeze, additional amount is the 10~20% of miberal powder gross mass, When granularity≤100 mesh, reduction rate is fast, it is ensured that ferriferous oxide effectively restores, and is convenient for subsequent separation, improves the product of iron Position.In addition, low-sulfur coal or coke breeze are cheap and easy to get, production cost is reduced.
SiO2+ xCaO (BaO)=xCaOSiO2(BaO·SiO2)(3≥x≥0.5) (1)
CaO (BaO)+S+C=CaS (BaS)+CO (2)
3Fe2O3+ CO=2Fe3O4+CO2 (3)
Fe3O4+ CO=3FeO+CO2 (4)
Fe3O4+ C=3FeO+CO (5)
FeO+C=Fe+CO (6)
Present invention high-iron bauxite to be processed is that slow-witted mine high-iron bauxite powder passes through originally for idle high-iron bauxite The processing of invention alleviates current iron, bauxite resource anxiety problem so that a large amount of slack resources are fully used.When granularity≤ When 100 mesh so that raw material mixes more uniform with reducing agent, modification agent, convenient for the reduction of subsequent iron with separate.
Al in high alumina tailings of the present invention2O3Grade has compared with raw ore significantly to be promoted, and up to 40% or more, it can be used as smelting aluminium Raw material, tailings is fully used, and solves the problems, such as that waste residue takes up an area, realizing turns waste into wealth.
Adaptability to raw materials of the present invention is strong, is applicable to the high-iron bauxite of heterogeneity range, iron recovery is high, reachable 80% or more, the efficient circulation for realizing resource utilizes.
The present invention reaches high ferrallite by microwave heating, carbon bath low-temperature reduction, lime (barium monoxide) desulfurization, magnetic separation separation Iron, aluminium separate in mine, and Iron grade is up to 90% or more in metal sponge iron, and the rate of recovery of iron is up to 80% or more, can be used for making Iron powder or steelmaking feed, and the grade of aluminium has compared with raw ore and is significantly promoted in the tailings after magnetic separation, can reach and smelts aluminum feedstock It is required that can be used for the smelting of aluminium.The present invention solves high-speed rail aluminium ore because iron, aluminium ore phase composition and embedding cloth relationship are complicated, it is difficult to benefit The problem of complex utilization of such ore is realized with traditional mining and metallurgy technology, so that a large amount of slack resources are fully used.It is whole A production process reaction rate is fast, high production efficiency, reduces the discharge of pollutant, improves product quality, economic and environment-friendly.
Specific embodiment
Here is certain specific embodiments of the invention, to be described in further detail.
A kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite is smelted, packet using microwave heating, tunnel oven Include following steps:
A. mixing: miberal powder, reducing agent, modification agent are added in batch mixer, mixed well.Miberal powder is slow-witted mine high-iron bauxite Powder, granularity≤100 mesh；Reducing agent is low-sulfur coal or coke breeze, and additional amount is the 10~20% of miberal powder gross mass, granularity≤100 Mesh；Modification agent is calcium oxide or barium monoxide, and additional amount is the 5~15% of miberal powder gross mass, granularity≤100 mesh.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and microwave heating is to 1000~1200 DEG C, heat preservation 0.5~1 hour, the oxide of iron is restored, metal sponge iron is obtained.
C. it separates metal sponge iron: after reduction, being separated with 1~2T magnetic induction intensity, obtain metal sponge iron With high alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge iron after magnetic separation separation is as steel-making or Magnetite (processed) raw material, and high alumina tailings is as the raw material for smelting aluminium.
Embodiment 1
Using somewhere 1# high-iron bauxite, chemical component TFe:28.2%, Fe2O3: 40.2%, Al2O3: 30.8%, SiO2: 10.6%, CaO:1.5%, other oxides: 16.9%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, low-sulfur coal, calcium oxide are added in batch mixer, and the additional amount of low-sulfur coal is miberal powder gross mass 15%, the additional amount of calcium oxide is the 10% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, low-sulfur coal and calcium oxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and to 1000 DEG C, heat preservation 0.8 is small for microwave heating When, the oxide of iron is restored, metal sponge iron is obtained.
C. separate metal sponge iron: after reduction, separated with 1.5T magnetic induction intensity, obtain metal sponge iron and High alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 93%, the rate of recovery 83%, the raw material as steel-making；High alumina tailings Middle Al2O3Grade is up to 40% or more, as the raw material for smelting aluminium.
Embodiment 2
Using somewhere 1# high-iron bauxite, chemical component TFe:28.2%, Fe2O3: 40.2%, Al2O3: 30.8%, SiO2: 10.6%, CaO:1.5%, other oxides: 16.9%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, low-sulfur coal, barium monoxide are added in batch mixer, and the additional amount of low-sulfur coal is miberal powder gross mass 20%, the additional amount of barium monoxide is the 15% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, low-sulfur coal and barium monoxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and microwave heating keeps the temperature 1 hour to 1100 DEG C, The oxide of iron is restored, metal sponge iron is obtained.
C. it separates metal sponge iron: after reduction, being separated with 1T magnetic induction intensity, obtain metal sponge iron and height Aluminium tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 95%, the rate of recovery 87%, the raw material as steel-making；High alumina tailings Middle Al2O3Grade is up to 40% or more, as the raw material for smelting aluminium.
Embodiment 3
Using somewhere 2# high-iron bauxite, chemical component TFe:20.9%, Fe2O3: 29.8%, Al2O3: 49.7%, SiO2: 7.6%, CaO:1.5%, TiO2: 5.3%, other oxides: 6.1%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, coke breeze, calcium oxide are added in batch mixer, and the additional amount of coke breeze is miberal powder gross mass 10%, the additional amount of calcium oxide is the 6% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, coke breeze and calcium oxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and to 1200 DEG C, heat preservation 0.5 is small for microwave heating When, the oxide of iron is restored, metal sponge iron is obtained.
C. separate metal sponge iron: after reduction, separated with 1.5T magnetic induction intensity, obtain metal sponge iron and High alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 92%, the rate of recovery 88%, the raw material as Magnetite (processed)；High alumina tail Al in slag2O3Grade is up to 60% or more, as the raw material for smelting aluminium.
Embodiment 4
Using somewhere 2# high-iron bauxite, chemical component TFe:20.9%, Fe2O3: 29.8%, Al2O3: 49.7%, SiO2: 7.6%, CaO:1.5%, TiO2: 5.3%, other oxides: 6.1%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, coke breeze, calcium oxide are added in batch mixer, and the additional amount of coke breeze is miberal powder gross mass 12%, the additional amount of calcium oxide is the 8% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, coke breeze and calcium oxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and microwave heating keeps the temperature 1 hour to 1100 DEG C, The oxide of iron is restored, metal sponge iron is obtained.
C. separate metal sponge iron: after reduction, separated with 1.2T magnetic induction intensity, obtain metal sponge iron and High alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 95%, the rate of recovery 85%, the raw material as Magnetite (processed)；High alumina tail Al in slag2O3Grade is up to 60% or more, as the raw material for smelting aluminium.
Embodiment 5
Using somewhere 3# high-iron bauxite, chemical component TFe:23.1%, Fe2O3: 32.9%, Al2O3: 51.9%, SiO2: 5.2%, CaO:3.1%, MgO:2.0%, other oxides: 4.9%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, low-sulfur coal, calcium oxide are added in batch mixer, and the additional amount of low-sulfur coal is miberal powder gross mass 12%, the additional amount of calcium oxide is the 5% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, low-sulfur coal and calcium oxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and microwave heating keeps the temperature 1 hour to 1100 DEG C, The oxide of iron is restored, metal sponge iron is obtained.
C. separate metal sponge iron: after reduction, separated with 1.2T magnetic induction intensity, obtain metal sponge iron and High alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 95%, the rate of recovery 85%, the raw material as steel-making；High alumina tailings Middle Al2O3Grade is up to 65% or more, as the raw material for smelting aluminium.
Embodiment 6
Using somewhere 3# high-iron bauxite, chemical component TFe:23.1%, Fe2O3: 32.9%, Al2O3: 51.9%, SiO2: 5.2%, CaO:3.1%, MgO:2.0%, other oxides: 4.9%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, low-sulfur coal, calcium oxide are added in batch mixer, and the additional amount of low-sulfur coal is miberal powder gross mass 15%, the additional amount of calcium oxide is the 8% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, low-sulfur coal and calcium oxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and to 1200 DEG C, heat preservation 0.5 is small for microwave heating When, the oxide of iron is restored, metal sponge iron is obtained.
C. separate metal sponge iron: after reduction, separated with 1.5T magnetic induction intensity, obtain metal sponge iron and High alumina tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 93%, the rate of recovery 84%, the raw material as steel-making；High alumina tailings Middle Al2O3Grade is up to 65% or more, as the raw material for smelting aluminium.
Embodiment 7
Using somewhere 3# high-iron bauxite, chemical component TFe:23.1%, Fe2O3: 32.9%, Al2O3: 51.9%, SiO2: 5.2%, CaO:3.1%, MgO:2.0%, other oxides: 4.9%.
In high-iron bauxite valuable constituent element comprehensive reutilization method the following steps are included:
A. mixing: miberal powder, low-sulfur coal, calcium oxide are added in batch mixer, and the additional amount of low-sulfur coal is miberal powder gross mass 15%, the additional amount of calcium oxide is the 8% of miberal powder gross mass, and granularity≤100 mesh of miberal powder, low-sulfur coal and calcium oxide are sufficiently mixed It is even.
B. the reduction of ferriferous oxide: being packed into tunnel oven for the powder after mixing, and to 1150 DEG C, heat preservation 0.8 is small for microwave heating When, the oxide of iron is restored, metal sponge iron is obtained.
C. it separates metal sponge iron: after reduction, being separated with 2T magnetic induction intensity, obtain metal sponge iron and height Aluminium tailings.
D. aluminium slag is recycled: recycling high alumina tailings.
Metal sponge Iron grade after magnetic separation separation is 92%, the rate of recovery 88%, the raw material as steel-making；High alumina tailings Middle Al2O3Grade is up to 65% or more, as the raw material for smelting aluminium.

Claims (8)

1. a kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite, it is characterised in that: use microwave heating, tunnel Kiln is smelted.
2. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 1 In the following steps are included:
A. mixing: miberal powder, reducing agent, modification agent are added in batch mixer and are mixed；
B. the reduction of ferriferous oxide: the powder after mixing is packed into tunnel oven, is heated and is kept the temperature, also by the oxide of iron It is former；
C. separate metal sponge iron: after reduction, magnetic separation separation obtains metal sponge iron and high alumina tailings；
D. aluminium slag is recycled: recycling high alumina tailings.
3. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 2 In: miberal powder is slow-witted mine high-iron bauxite powder, granularity≤100 mesh.
4. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 2 In: reducing agent is low-sulfur coal or coke breeze, and additional amount is the 10 ~ 20% of miberal powder gross mass, granularity≤100 mesh.
5. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 2 In: modification agent is calcium oxide or barium monoxide, and additional amount is the 5 ~ 15% of miberal powder gross mass, granularity≤100 mesh.
6. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 2 In: in step B, heating temperature is 1000 ~ 1200 DEG C, and soaking time is 0.5 ~ 1 hour.
7. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 2 In: the magnetic induction intensity that magnetic separation separates in step C is 1 ~ 2T.
8. the method for valuable constituent element comprehensive reutilization, feature exist in a kind of high-iron bauxite according to claim 2 In: the metal sponge iron after magnetic separation separation is as steel-making or Magnetite (processed) raw material, and high alumina tailings is as the raw material for smelting aluminium.
CN201810620789.9A 2018-06-15 2018-06-15 A kind of method of valuable constituent element comprehensive reutilization in high-iron bauxite Pending CN108998610A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113943843A (en) * 2021-10-25 2022-01-18 薛世峰 Smelting process for producing steel by low-temperature reduction

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