CN114438310A - Process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation - Google Patents

Process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation Download PDF

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Publication number
CN114438310A
CN114438310A CN202210068388.3A CN202210068388A CN114438310A CN 114438310 A CN114438310 A CN 114438310A CN 202210068388 A CN202210068388 A CN 202210068388A CN 114438310 A CN114438310 A CN 114438310A
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red mud
suspension
gas
magnetic
iron ore
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权芳民
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Jiuquan Iron and Steel Group Co Ltd
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Jiuquan Iron and Steel Group Co Ltd
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    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/10—Roasting processes in fluidised form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/08—Ferroso-ferric oxide (Fe3O4)
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment

Abstract

The invention relates to a process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation, which is used for producing iron ore concentrate by using iron-containing red mud and comprises the following steps: drying the red mud containing iron, finely crushing and mixing the dried red mud and additives, adding the mixed material into a suspension heating furnace, controlling the heating temperature to be 1000-900 ℃, adding the heated material into a suspension reduction furnace, controlling the reduction time to be 15-25s, controlling the final reduction temperature to be 800-900 ℃, and fully magnetizing the red mud. And finally, cooling the high-temperature roasted material by an oxygen-free cooling device and grinding the high-temperature roasted material by a wet-type ore mill to obtain ore pulp, and carrying out magnetic separation by a two-stage magnetic separator to obtain iron ore concentrate with higher grade. The method for producing the iron ore concentrate by the red mud adopts the suspension heating and suspension reduction method, can improve the magnetizing roasting quality of the red mud while the red mud is embedded and has large granularity, and achieves the purpose of improving the grade of the iron ore concentrate and the recovery rate of metals.

Description

Process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation
Technical Field
The invention belongs to the technical field of metallurgy and mineral engineering, and relates to a process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation.
Background
Red mud is the polluting waste residue discharged when extracting alumina in the aluminum industry, and generally 1.0-2.0 tons of red mud are additionally produced when producing 1 ton of alumina on average. The red mud discharged in China every year reaches millions of tons, a large amount of red mud cannot be fully and effectively utilized, and can only be stacked in large-area storage yards, so that the environment is polluted, a lot of available components in the red mud cannot be reasonably utilized, secondary waste of resources is caused, and the sustainable development of the aluminum industry is seriously hindered.
When the aluminum oxide is produced by a Bayer process, the produced red mud mainly comprises hematite, goethite, siderite, hydrous sodium aluminosilicate, diaspore, aragonite and calcite, and also comprises a small amount of trona, water glass, caustic soda and the like, wherein the red mud has the chemical composition of TFe: 25 to 35% of Fe2O3：40～50%、SiO2：15～20%、Al2O3：21～25%、CaO：2～10%、TiO2: 2-5%. The useful component in the red mud iron slag is ferric oxide, and the main impurity component is aluminum oxide. Meanwhile, the red mud has a hardened structure and very fine granularity, wherein mud with the particle size of-10 mu m accounts for 58 percent, the materials are sticky, the sample preparation and grinding are easy, the natural stacking is loose, the bulk density is small, and the melting point is 1200-1250 ℃. The pH value of the red mud is 10.29-11.83, the fluoride content is 4.89-8.6mg/L, and the red mud belongs to common solid waste residue.
The main minerals in the red mud are hematite, hydrated aluminosilicate and Na2The content of O is as high as 2-3%, the content of iron oxide is low, weak magnetic iron occupies a large proportion, the combined chemical alkali is difficult to remove and has large content, fluorine, aluminum and other impurities are also contained, iron-containing minerals in the red mud and other minerals are mutually wrapped and seriously intergrown, so that the iron oxide is difficult to separate from other minerals during magnetic separation, and iron slag in the red mud is difficult to separate by adopting other processes except the magnetic separation process. When the red mud is utilized by adopting a direct reduction process, the red mud needs to be dried, scattered and mixed with reduced coal, then the red mud is mixed and briquetted, a tunnel kiln or a rotary hearth furnace is adopted for reduction, and finally, the metallized iron powder is produced by adopting ore grinding and magnetic separation processes, which has the main problems that: the production process flow is longer, the production cost is higher, the red mud reduction quality is poorer, the metal recovery rate is lower, and meanwhile, Na with low melting point and high boiling point is easily formed in the direct reduction2CO3The coating is easy to adhere to the pipe wall and difficult to remove, and brings a series of problems to the direct reduction of the next procedure; when the red mud is utilized by adopting a magnetizing roasting process, the red mud needs to be dried, scattered, mixed with reduced coal and then mixedAnd after briquetting, carrying out magnetization roasting by adopting a tunnel kiln or a rotary hearth furnace, and finally producing iron ore concentrate by adopting ore grinding and magnetic separation processes, wherein the main problems are as follows: because the embedded particle size is very fine, the internal permeability of the pressed block is poor, the roasting uniformity of the red mud is poor, and the roasted ore needs to be ground to be very fine in particle size to realize mineral dissociation, so that the ore grinding cost is high, the metal recovery rate is low, the iron grade of the ground and selected product is low, and the production process flow is long.
Under the circumstances, the harmless utilization technology of the red mud with low cost and high metal recovery rate is difficult to carry out, and experts in various countries in the world carry out a great deal of scientific research on the comprehensive utilization of the red mud, but the research is not advanced greatly.
The invention provides a process for producing iron ore concentrate by red mud suspension magnetizing roasting-grinding separation, which aims to solve the problems of long production process flow, high ore grinding cost, lower metal recovery rate, low metallization rate of reduced materials, low iron grade of ground and separated products and low metal recovery rate in the red mud magnetizing roasting process.
Disclosure of Invention
The invention aims to provide a process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation.
The invention relates to a process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation, which is completed by the following equipment and processes:
production equipment: the drying machine comprises a drying machine, wherein a flue gas inlet of the drying machine is connected with a flue gas outlet of a first cyclone separator, a flue gas outlet of the drying machine is connected with a second cyclone separator, the second cyclone separator is connected with a bag-type dust collector, a discharge port of the drying machine is connected with a feed port of a grinding and mixing machine, a discharge port of the grinding and mixing machine is connected with a feed port of a suspension heating furnace, the upper part of the suspension heating furnace is connected with an inlet of the first cyclone separator through a gas-solid two-phase outflow pipeline, a heating material outlet at the bottom of the first cyclone separator is connected with a material inlet of the suspension reduction furnace, a reducing gas inlet pipeline is arranged at the bottom of the suspension reduction furnace, a reduced gas outlet at the top of the suspension reduction furnace is connected with a gas high-speed burner arranged at the bottom of the suspension heating furnace, the high-speed gas burner is connected with a Roots blower, and a reduced material outlet of the suspension reduction furnace is connected with an anaerobic cooling device, the anaerobic cooling device is connected with a wet-type ore mill, the wet-type ore mill is connected with a first-stage magnetic separator, and the first-stage magnetic separator is connected with a second-stage magnetic separator.
And a coarse particle dust discharge pipe at the bottom of the second cyclone separator and a fine particle dust discharge pipe at the bottom of the bag-type dust collector are connected with a feeding port of the suspension heating furnace. An additive feeding port is formed in the feeding port of the grinding and mixing machine. The bag-type dust collector is connected with the smoke extractor, and the smoke extractor is connected with the chimney.
The production process comprises the following steps:
(1) drying and scattering the red mud, namely drying the red mud by a dryer at the drying temperature of 180-200 ℃ for 20-30min, controlling the water content of the dried material to be below 3%, mixing the dried red mud with an additive, adding the mixture into a grinding and mixing machine for fine crushing, and controlling the fine crushing granularity to be-200 meshes and account for more than 80%; the additive added in the dried and preheated red mud is limestone powder with the granularity of-200 meshes accounting for 90 percent, and the weight ratio of the red mud and the additive is 100: 2-3 of mixing ingredients in a mass ratio. The red mud is dried by adopting a cylindrical dryer, the high-temperature flue gas discharged by the cyclone separator is used as a heat source, the heat exchange is carried out between the high-temperature flue gas and the red mud in the process of countercurrent flow in the dryer, and the red mud can be dried and preheated while the waste heat of the high-temperature flue gas is fully recovered.
(2) Heating in a suspension heating furnace, namely adding the finely crushed materials into the suspension heating furnace, supplying heat in a mode of mixed combustion of reduced coal gas and air in a coal gas high-speed burner, heating the red mud in a suspension roasting mode, and generating a liquid phase by alkali metal in the red mud when the temperature of the red mud is raised to 1000-1100 ℃ and growing up fine particles in the red mud; the heat supply is that air with pressure of 8-10KPa and reduced coal gas are blown from the bottom of the suspension heating furnace by a Roots blower and are combusted and mixed in a coal gas high-speed burner, and high-temperature flue gas generated by combustion is introduced from the bottom of the suspension heating furnace.
(3) Reducing in a suspension reduction furnace by separating gas and solid in a cyclone separator from the high-temperature red mud material discharged from the suspension heating furnaceAdding the red mud into a suspension reduction furnace after separation, carrying out suspension magnetization roasting on the red mud by adopting reduction gas, and controlling the temperature of the roasted ore after reduction to be 800-900 ℃ so as to enable Fe in the roasted ore3O4The embedding particle size is large, and the reduced coal gas is used as fuel of the suspension heating furnace; the reducing gas is any one of blast furnace gas, producer gas and mixed gas formed by mixing the blast furnace gas and the producer gas, and the using amount of the reducing gas in the suspension reducing furnace is 350-400m3T red mud material. In a suspension reduction furnace, the reduction time of material suspension roasting is controlled to be 15-25s, and the use amount of reducing gas is controlled to be 350-3T, Fe in red mud2O3Conversion to magnetic Fe3O4。
(4) Cooling roasted materials: the reduced high-temperature roasting material enters an oxygen-free cooling device to indirectly exchange heat with normal-temperature water, and the temperature of the roasting material can be reduced to below 200 ℃ while medium-temperature medium-pressure steam at the temperature of 300-400 ℃ is produced.
(5) And adding the cooled roasting material into a wet-type ore mill for ore milling, wherein the ore milling granularity is controlled to be about 80 percent of-200 meshes.
(6) Adding the wet-milled material into a first-stage magnetic separator for magnetic separation, controlling the magnetic separation intensity of the magnetic separator to be 1200-containing 2500 Oe to obtain a strong magnetic material and a weak magnetic material, then adding the weak magnetic material into a second-stage magnetic separator for magnetic separation, controlling the magnetic separation intensity of the magnetic separator to be 2200-containing 2500 Oe to obtain a magnetic material and a non-magnetic material.
(7) The strong magnetic material and the magnetic material are mixed to obtain iron ore concentrate with iron grade of more than 55%, and the non-magnetic material is used as tailings to be discharged.
(8) The high-temperature flue gas separated from the cyclone separator is used as a heat source of a dryer to directly exchange heat with the water-containing red mud, and the 150-plus 180 ℃ low-temperature flue gas discharged from the dryer is dedusted by a bag-type dust remover, pressurized by a smoke extractor and discharged through a chimney.
The invention also provides a process for utilizing tailings generated after red mud disposal, which is used for preparing the tailings into baking-free bricks and comprises the following steps:
(1) adding the following components in nonmagnetic tailings according to the ratio of tailings, fly ash, sand and stone: gypsum, namely lime, namely water, wherein the ratio of water to the gypsum is =100, (8-9), (7-8), (1-2), (2-3) and (2-3), the gypsum and the lime are mixed according to a certain proportion, and then the gypsum and the lime are stirred and mixed to form a mixture;
(2) preparing the mixture into a green brick with a fixed shape;
(3) pre-curing the green brick at 50 ℃ and 70% humidity for 12 hours, and curing at 180 ℃ and 0.8-1.2MPa for 8 hours to obtain the baking-free brick.
The invention has the advantages of
(1) According to the invention, the additives for inhibiting the combination of silicon aluminum and the like with iron at high temperature are added, so that the silicon aluminum and the like in the red mud are not combined with the iron during roasting reduction, and the particles are not bonded.
(2) The suspension heating temperature of the red mud in the suspension heating furnace is controlled to be 1000-1100 ℃, so that fine particles below-300 meshes in the red mud can be bonded with each other under the action of high temperature, the embedding particle size of the red mud is increased, and conditions are provided for subsequent ore grinding and magnetic separation.
(3) The invention leads reducing coal gas into the suspension reduction furnace from the bottom, the reducing coal gas contacts with high-temperature red mud fine powder flowing downwards in the suspension reduction furnace from bottom to top in the flowing process, and after the red mud is fully fluidized, gas-solid two-phase flow depends on CO and H in the coal gas2For Fe in red mud2O3Reducing the iron oxide to Fe3O4。
(4) The invention adopts wet grinding and magnetic separation method for roasted materials, and most of Na in the roasted materials can be removed in magnetic separation2And O, obtaining qualified iron ore concentrate of high-iron low-alkali metal with iron grade of 55-62%.
(5) The invention solves the problems of package and continuous growth between iron-containing minerals and other minerals in the red mud, makes iron-containing oxides and other minerals easy to separate, and improves the magnetic separation effect.
(6) The invention provides a red mud magnetizing roasting comprehensive utilization system, which efficiently separates fine iron ore and improves the comprehensive utilization rate of red mud through a novel gas-based reduction magnetizing roasting system.
(7) The non-magnetic tailings after the magnetizing roasting can be used as building materials, and the comprehensive utilization rate of the red mud is improved.
Drawings
FIG. 1 is a flow chart of a process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation;
FIG. 2 is a connection diagram of an apparatus for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to the present invention;
in the figure: 1-drying machine, 2-first cyclone separator, 3-second cyclone separator, 4-grinding mixer, 5-suspension heating furnace, 6-gas-solid two-phase outlet pipeline, 7-suspension reduction furnace, 8-reduction coal gas inlet pipeline, 9-coal gas high-speed burner, 10-oxygen-free cooling device, 11-wet grinding machine, 12-primary magnetic separator, 13-secondary magnetic separator, 14-additive charging port, 15-roots blower, 16-coarse dust discharge pipe, 17-fine dust discharge pipe and 18-bag dust collector.
Detailed Description
A process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation is completed by the following equipment and processes:
as shown in fig. 2, the production equipment comprises a dryer 1, a flue gas inlet of the dryer 1 is connected with a flue gas outlet of a first cyclone separator 2, a flue gas outlet of the dryer 1 is connected with a second cyclone separator 3, the second cyclone separator 3 is connected with a bag-type dust collector 18, a discharge port of the dryer 1 is connected with a feed port of a milling and mixing machine 4, and a feed port of the dryer 1 is connected with a red mud ore bin. An additive feeding port 14 is arranged at the feeding port of the grinding and mixing machine 4. The discharge port of the mill mixer 4 is connected with the feed port of the suspension heating furnace 5, the upper part of the suspension heating furnace 5 is connected with the inlet of the first cyclone separator 2 through a gas-solid two-phase outflow outlet pipeline 6, the heated material outlet at the bottom of the first cyclone separator 2 is connected with the material inlet of the suspension reduction furnace 7, the bottom of the suspension reduction furnace 7 is provided with a reduced gas inlet pipeline 8, the reduced gas outlet at the top of the suspension reduction furnace 7 is connected with a gas high-speed burner 9 arranged at the bottom of the suspension heating furnace 5, and the gas high-speed burner 9 is connected with a Roots blower 15. The reducing material outlet of the suspension reduction furnace 7 is connected with an anaerobic cooling device 10, the anaerobic cooling device 10 is connected with a wet mill 11, the wet mill 11 is connected with a first-stage magnetic separator 12, the first-stage magnetic separator 12 is connected with a second-stage magnetic separator 13, a bag-type dust collector 18 is connected with a smoke extractor 19, and the smoke extractor 19 is connected with a chimney 20. A coarse dust discharge pipe 16 at the bottom of the second cyclone 3 and a fine dust discharge pipe 17 at the bottom of the bag-type dust collector 18 are connected with a feeding port of the suspension heating furnace 5.
The production process comprises the following steps:
(1) drying and scattering the red mud, namely drying the red mud by a dryer at the drying temperature of 190 ℃ for 25min, controlling the water content of the dried material to be 2%, adding the dried red mud and additives into a grinding and mixing machine for fine crushing, wherein the fine crushing granularity is controlled to be 86% with a granularity of-200 meshes. The additive adopts limestone powder with the granularity of-200 meshes accounting for 90 percent, and the weight ratio of the red mud and the additive is 100: 2-3 of mixing materials in a mass ratio;
(2) heating in a suspension heating furnace, namely adding the finely crushed materials into the suspension heating furnace, supplying heat in a mode of mixed combustion of reduced coal gas and air in a coal gas high-speed burner, heating the red mud in a suspension roasting mode, and generating a liquid phase by alkali metal in the red mud when the temperature of the red mud is raised to 1050 ℃ and growing up fine particles in the red mud;
(3) reducing in a suspension reduction furnace, namely separating gas and solid from high-temperature red mud discharged from the suspension heating furnace by a cyclone separator, adding the separated gas and solid into the suspension reduction furnace, performing suspension magnetization roasting on the red mud by using reducing gas, and controlling the temperature of roasted ore after reduction to 860 ℃ to ensure that Fe in the roasted ore3O4The embedding particle size is large, and the reduced coal gas is used as fuel of the suspension heating furnace;
(4) cooling roasted materials: the reduced high-temperature roasting material enters an oxygen-free cooling device to indirectly exchange heat with normal-temperature water, and the temperature of the roasting material can be reduced to below 180 ℃ while medium-temperature and medium-pressure steam at 320 ℃ is generated;
(5) adding the cooled roasting material into a wet-type ore mill for ore milling, wherein the ore milling granularity is controlled to be 83% of-200 meshes;
(6) adding the wet-milled material into a first-stage magnetic separator for magnetic separation, controlling the magnetic separation intensity of the magnetic separator to be 1200 Oe to obtain a strong magnetic material and a weak magnetic material, adding the weak magnetic material into a second-stage magnetic separator for magnetic separation, and controlling the magnetic separation intensity of the magnetic separator to be 2500 Oe to obtain a magnetic material and a non-magnetic material;
(7) mixing the strong magnetic material and the magnetic material to obtain iron ore concentrate with an iron grade of 56.12%, wherein the recovery rate is 82.75%, the S content is 0.273%, and the non-magnetic material is discharged as tailings;
(8) the high-temperature flue gas separated from the cyclone separator is used as a heat source of the dryer to directly exchange heat with the water-containing red mud, and the low-temperature flue gas at 170 ℃ discharged from the dryer is dedusted by the bag-type dust remover, pressurized by the smoke extractor and then discharged.
The process for utilizing tailings generated after red mud disposal comprises the following steps:
(1) adding the following components in nonmagnetic tailings according to the ratio of tailings, fly ash to sand: gypsum, lime and water in a ratio of (1: 100:8.5:7.5:1.5:2.5: 2.5) are mixed, and then stirred and mixed to form a mixture;
(2) preparing the mixture into a green brick with a fixed shape;
(3) pre-curing the green brick at 50 ℃ and 70% humidity for 12 hours, and curing at 180 ℃ and 0.9MPa vapor pressure for 8 hours to obtain the baking-free brick.

Claims (9)

1. A process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation is completed by the following equipment and processes:
production equipment: the drying machine comprises a drying machine, wherein a flue gas inlet of the drying machine is connected with a flue gas outlet of a first cyclone separator, a flue gas outlet of the drying machine is connected with a second cyclone separator, the second cyclone separator is connected with a bag-type dust collector, a discharge port of the drying machine is connected with a feed port of a grinding and mixing machine, a discharge port of the grinding and mixing machine is connected with a feed port of a suspension heating furnace, the upper part of the suspension heating furnace is connected with an inlet of the first cyclone separator through a gas-solid two-phase outflow pipeline, a heating material outlet at the bottom of the first cyclone separator is connected with a material inlet of the suspension reduction furnace, a reducing gas inlet pipeline is arranged at the bottom of the suspension reduction furnace, a reduced gas outlet at the top of the suspension reduction furnace is connected with a gas high-speed burner arranged at the bottom of the suspension heating furnace, the high-speed gas burner is connected with a Roots blower, and a reduced material outlet of the suspension reduction furnace is connected with an anaerobic cooling device, the anaerobic cooling device is connected with a wet-type ore mill, the wet-type ore mill is connected with a primary magnetic separator, and the primary magnetic separator is connected with a secondary magnetic separator;
the production process comprises the following steps:
(1) drying and finely crushing the red mud, namely drying the red mud for 20-30min at the temperature of 180-200 ℃ by adopting a dryer, controlling the water content of the dried material to be below 3 percent, mixing and blending the dried red mud and an additive, and finely crushing the mixture, wherein the finely crushed particle size is controlled to be-200 meshes and accounts for more than 80 percent;
(2) heating in a suspension heating furnace, namely adding the finely crushed red mud material into the suspension heating furnace, supplying heat by adopting a mixed combustion mode of reduced coal gas and air, heating the red mud material by adopting a suspension roasting mode, and controlling the heating temperature to be 1000-1100 ℃;
(3) reduction in a suspension reduction furnace, namely adding the high-temperature red mud material discharged from the suspension heating furnace into the suspension reduction furnace after gas-solid separation by a cyclone separator, performing suspension magnetization roasting on the red mud by using reduction gas, controlling the temperature of roasted ore after reduction to 800 ℃ and the suspension reduction time of the material to 15-25s, and enabling Fe in the red mud to be in suspension reduction2O3Conversion to magnetic Fe3O4The reduced coal gas is used as fuel of the suspension heating furnace;
(4) cooling roasted materials: the reduced high-temperature roasting material enters an oxygen-free cooling device to reduce the temperature of the roasting material to below 200 ℃;
(5) adding the cooled roasting material into a wet-type ore mill for ore milling, wherein the ore milling granularity is controlled to be 80% of-200 meshes;
(6) adding the wet-milled material into a primary magnetic separator for magnetic separation, controlling the magnetic separation strength of the magnetic separator to be 1200-class 2500 Oe to obtain a strong magnetic material and a weak magnetic material, adding the weak magnetic material into a secondary magnetic separator for magnetic separation, controlling the magnetic separation strength of the magnetic separator to be 2200-class 2500 Oe to obtain a magnetic material and a non-magnetic material;
(7) the strong magnetic material and the magnetic material are mixed to obtain iron ore concentrate with iron grade of more than 55%, and the non-magnetic material is used as tailings to be discharged.
2. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 1, which is characterized in that: and a coarse particle dust discharge pipe at the bottom of the second cyclone separator and a fine particle dust discharge pipe at the bottom of the bag-type dust collector are connected with a feeding port of the suspension heating furnace.
3. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 1, which is characterized in that: an additive feeding port is formed in the feeding port of the grinding and mixing machine.
4. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 1, which is characterized in that: the bag-type dust collector is connected with the smoke extractor, and the smoke extractor is connected with the chimney.
5. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 1 or 2, which is characterized in that: in the step (1), the additive adopts limestone powder with the granularity of-200 meshes accounting for 90 percent, and the weight ratio of the red mud and the additive is 100: 2-3 of mixing ingredients in a mass ratio.
6. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 16, which is characterized in that: in the step (2), air with the pressure of 8-10KPa and reduced coal gas are blown into the bottom of the suspension heating furnace through a Roots blower and are mixed and combusted in a coal gas high-speed burner, and high-temperature flue gas generated by combustion is introduced from the bottom of the suspension heating furnace.
7. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 16, which is characterized in that: in the step (3), the reducing gas is any one of blast furnace gas, producer gas or mixed gas formed by mixing the blast furnace gas and the producer gas.
8. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 1, which is characterized in that: in the step (3), the amount of reducing gas used in the suspension reduction furnace is 350-3T red mud material.
9. The process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation according to claim 1, which is characterized in that: the process for utilizing tailings generated after red mud disposal comprises the following steps:
(1) adding the non-magnetic tailings into the non-magnetic tailings in a proportion that the tailings comprise the following components: gypsum, namely lime, namely water, wherein the ratio of water to the gypsum is =100, (8-9), (7-8), (1-2), (2-3) and (2-3), the gypsum and the lime are mixed according to a certain proportion, and then the gypsum and the lime are stirred and mixed to form a mixture;
(2) preparing the mixture into a green brick with a fixed shape;
(3) pre-curing the green brick at 50 ℃ and 70% humidity for 12 hours, and curing at 180 ℃ and 0.8-1.2MPa for 8 hours to obtain the baking-free brick.
CN202210068388.3A 2022-01-20 2022-01-20 Process for producing iron ore concentrate by red mud suspension magnetization roasting-grinding separation Pending CN114438310A (en)

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Citations (5)

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US3295924A (en) * 1961-10-24 1967-01-03 Montedison Spa Process for recovering iron, titanium and aluminum from the red slurries obtained in processing bauxite by the bayer process
CN107523686A (en) * 2017-07-19 2017-12-29 东北大学 A kind of device and method that Iron concentrate is prepared for red mud suspension roasting
CN109160744A (en) * 2018-10-25 2019-01-08 青岛盈坤源国际贸易有限公司 Red mud magnetizing roast utilization system and technique
CN111589563A (en) * 2020-05-29 2020-08-28 东北大学 Device and method for extracting iron from iron tailings by suspension roasting
US20200299806A1 (en) * 2016-03-25 2020-09-24 Fakon Vállalkozási Kft. Process for processing red mud and producing rare-earth metal salts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295924A (en) * 1961-10-24 1967-01-03 Montedison Spa Process for recovering iron, titanium and aluminum from the red slurries obtained in processing bauxite by the bayer process
US20200299806A1 (en) * 2016-03-25 2020-09-24 Fakon Vállalkozási Kft. Process for processing red mud and producing rare-earth metal salts
CN107523686A (en) * 2017-07-19 2017-12-29 东北大学 A kind of device and method that Iron concentrate is prepared for red mud suspension roasting
CN109160744A (en) * 2018-10-25 2019-01-08 青岛盈坤源国际贸易有限公司 Red mud magnetizing roast utilization system and technique
CN111589563A (en) * 2020-05-29 2020-08-28 东北大学 Device and method for extracting iron from iron tailings by suspension roasting

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