CN101831560B - Method for producing iron ore concentrate by using Bayer process red muddy sand - Google Patents
Method for producing iron ore concentrate by using Bayer process red muddy sand Download PDFInfo
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- CN101831560B CN101831560B CN2010101963978A CN201010196397A CN101831560B CN 101831560 B CN101831560 B CN 101831560B CN 2010101963978 A CN2010101963978 A CN 2010101963978A CN 201010196397 A CN201010196397 A CN 201010196397A CN 101831560 B CN101831560 B CN 101831560B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 64
- 239000004576 sand Substances 0.000 title claims abstract description 64
- 239000012141 concentrate Substances 0.000 title claims abstract description 43
- 238000004131 Bayer process Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 20
- 238000007885 magnetic separation Methods 0.000 claims abstract description 15
- 239000012153 distilled water Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 13
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 13
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 13
- 238000013467 fragmentation Methods 0.000 claims description 6
- 238000006062 fragmentation reaction Methods 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 50
- 230000008569 process Effects 0.000 abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 12
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 2
- 238000000227 grinding Methods 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 238000010924 continuous production Methods 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 229910001570 bauxite Inorganic materials 0.000 description 12
- 238000005245 sintering Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 8
- 239000003513 alkali Substances 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000008396 flotation agent Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001648 diaspore Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 244000070406 Malus silvestris Species 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229940115440 aluminum sodium silicate Drugs 0.000 description 1
- -1 alumogoethite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910052663 cancrinite Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 1
- 229940038472 dicalcium phosphate Drugs 0.000 description 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000429 sodium aluminium silicate Substances 0.000 description 1
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for producing an iron ore concentrate by using Bayer process red muddy sand. The method comprises the following steps of: drying, crushing, grinding and grading the red muddy sand; mixing the red muddy sand after grinding and grading with solution of sodium hydrate, then performing dissolution reaction on the mixture, and performing solid-liquid separation after finishing the reaction; and washing a solid obtained after the solid-liquid separation by using distilled water, and then performing wet magnetic separation to prepare the iron ore concentrate. In the method for producing the iron ore concentrate by using the Bayer process red muddy sand, the effective utilization ratio of the iron element can be over 90 percent, the Al2O3 content in the finally prepared iron ore concentrate is reduced to 2.0 percent, and the SiO2 content in the iron ore concentrate is less than 2.0 percent; and the method can realize continuous production of the process, utilize discharged red muddy sand to the utmost extent, promote the product added value, reduce the production cost and protect the environment.
Description
Technical field
The present invention relates to a kind of production iron ore concentrate, relate in particular to a kind of method of utilizing Bayer process red muddy sand to produce iron ore concentrate.
Background technology
Red mud is to refine the waste that produces in the alumina process with bauxite, because of it is gained the name for crimson look muddy.Along with the continuous development of alum clay industry, be more than 1,500 ten thousand tons red mud quantity discharged every year of China, and along with the volume increase transformation of new operation and old equipment, the red mud total amount has the trend of rising.The most of alumina producers in countries in the world are that red mud is piled up or the impouring deep-sea, depositing of red mud not only takies a large amount of soils and farmland, expends more stockyard construction and maintenance cost, and the residue alkali lye that is present in the red mud can cause groundwater pollution to underground infiltration.In addition, the dust that the red mud in stockyard forms flies upward everywhere, and broken ring ecotope causes severe contamination.The current society of be becoming tight in land resources day, environment protection is increasingly important, one of focus that the comprehensive regulation of red mud has become people to be paid close attention to.Red mud is the maximum waste that produces in the aluminum oxide production process, also is the greatest contamination source of alumina producing.Because production method and bauxite grade is different, the aluminum oxide that every production is a ton approximately will produce 0.5 ton～2.5 tons red mud, and red mud per ton also attaches 3m
3～4m
3Alkali waste.
Red mud is according to the difference of alumina-producing method, can be divided into three kinds of sintering process, Bayer process and integrated processs, because the content abundance difference of bauxite, the method taked of alumina producing is also different both at home and abroad.Except that China and USSR (Union of Soviet Socialist Republics), other various countries all adopt Bayer process production, and Bayer process output accounts for more than 90% of Gross World Product.What Bayer process produce to adopt is, highly basic NaOH stripping high alumina, high-iron bauxite, aluminum oxide, ferric oxide, alkali content height in the red mud of generation, processing be boehmite type and gibbsitic bauxite.What sintering process and integrated process were handled is the high silicon of indissoluble, low iron, diaspore type, kaolinite type bauxite, CaO content height in the red mud of generation, and alkali and iron level are lower.China mainly is the sintering process and the integrated process of producing aluminum oxide with diaspore type bauxite, and the main component of red mud from sintering process and integrated process red mud is Dicalcium Phosphate (Feed Grade) and hydrate thereof.Abroad then based on Bayer process, the main component of Bayer process red mud is rhombohedral iron ore, sodium aluminium silicate hydrate, cancrinite etc.
Bayer process red mud mainly contains materials such as ferric oxide, alumogoethite, quartz, and content is very high.Present flow process underflow effluxes red muddy sand and how to efflux to contain ferrous components, and what iron level was higher sells with low price, greatly reduces value-added content of product.
Aspect the iron recovery of red mud, Pingguo Aluminium Industry Corp and Guangxi Metallurgy Inst. unite that to have done with the coal be reductive agent, carry out the experimental study of direct reduction iron making, its technical process is with coal mixing, briquetting, drying, carries out reducing roasting then, and sponge iron is produced in last magnetic separation.Whole process adopts pyrotic smelting, the technical process complexity, and the rate of recovery of iron is low.And companies such as the coloured institute in Ganzhou adopt high-gradient, high strength magnetic separator to reclaim the iron in the red mud, investment working cost height, and the rate of recovery of iron is low simultaneously.
Summary of the invention
The present invention is directed to the low deficiency of the rate of recovery of the existing technical process complexity of utilizing Bayer process red mud to produce iron ore concentrate, investment working cost height, iron, a kind of method of utilizing Bayer process red muddy sand to produce iron ore concentrate is provided.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of method of utilizing Bayer process red muddy sand to produce iron ore concentrate may further comprise the steps:
Step 10: with red muddy sand dry, fragmentation and grind grading, make that the granularity of red muddy sand is controlled at 10 microns～90 microns behind the grind grading;
Step 20: after the red muddy sand behind the grind grading and caustic soda soln mixed with mass ratio in 1: 8～1: 2, under 110 ℃～180 ℃, 0.1Mpa～0.6Mpa, carry out stripping reaction 0.2 hour～2 hours, and after reaction finishes, carry out solid-liquid separation;
Step 30: adopt distilled water under 70 ℃～95 ℃, to wash Na in the washings that washing obtains the solid that obtains after the solid-liquid separation
2O content carries out wet magnetic separation again less than after 0.3%, can make iron ore concentrate.
The invention has the beneficial effects as follows: the present invention utilizes Bayer process red muddy sand to produce that the ferro element effective rate of utilization can reach more than 90% in the method for iron ore concentrate, promptly the ratio that the total amount of ferro element accounts for ferro element total amount in the parent red muddy sand in the iron ore concentrate of Huo Deing can reach more than 90% Al in the iron ore concentrate that makes at last
2O
3Content is reduced to 2.0%, SiO
2Content is less than 2.0%; Serialization production that can realization flow utilizes to greatest extent and effluxes red muddy sand, promotes added value of product, reduces production costs the protection environment; Reduce the iron level that returns red muddy sand in the sintering process batching, also finished the preparation of sorting iron ore concentrate in the red muddy sand; The resultant market capacity is big, has established the application of this technology.
On the basis of technique scheme, the present invention can also do following improvement.
Further, in the described step 10 behind the grind grading granularity of red muddy sand be controlled at 30 microns～70 microns.
Further, the mass ratio 1: 5～1: 3 of red muddy sand behind the grind grading and caustic soda soln in the described step 20.
Further, the temperature of stripping reaction is 130 ℃～160 ℃ in the described step 20.
Further, the pressure of stripping reaction is 0.3Mpa～0.5Mpa in the described step 20.
Further, the time of stripping reaction is 1 hour～1.5 hours in the described step 20.
Further, the content of the interior sodium oxide of caustic soda soln is 130g/L～500g/L in the described step 20.
Further, the content of the interior sodium oxide of caustic soda soln is 200g/L～400g/L in the described step 20.
Further, the mass ratio of the distilled water of solid that obtains after the solid-liquid separation in the described step 30 and washing usefulness is 1: 7～1: 5.
Further, the magneticstrength of carrying out wet magnetic separation in the described step 30 is 4000 Gausses～18000 Gausses.
Further, the magneticstrength of carrying out wet magnetic separation in the described step 30 is 7000 Gausses～13000 Gausses.
Description of drawings
Fig. 1 produces the method flow synoptic diagram of iron ore concentrate for the present invention utilizes Bayer process red muddy sand.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Fig. 1 produces the method flow synoptic diagram of iron ore concentrate for the present invention utilizes Bayer process red muddy sand.As shown in Figure 1, said method comprising the steps of:
Step 10: with red muddy sand dry, fragmentation and grind grading, make that the granularity of red muddy sand is controlled at 10 microns～90 microns behind the grind grading.
Described red muddy sand is exactly the coarse particles sand grains part of red mud in fact.Preferably, the granularity of red muddy sand is controlled at 30 microns～70 microns behind the described grind grading.Red muddy sand can be along with the difference of factors such as the difference of bauxitic ore, aluminum oxide dissolving-out technology and difference, the red muddy sand of Shi Yonging not is that the red muddy sand that produces in bauxite refines alumina process can both use in the present invention, needs to select all iron content greater than 40% red muddy sand.
Step 20: after the red muddy sand behind the grind grading and caustic soda soln mixed with mass ratio in 1: 8～1: 2, under 110 ℃～180 ℃, 0.1Mpa～0.6Mpa, carry out stripping reaction 0.2 hour～2 hours, and after reaction finishes, carry out solid-liquid separation.
The reaction that takes place in this step is the stripping reaction that quartz sand and sodium hydroxide take place.Preferably, the mass ratio of red muddy sand behind the described grind grading and caustic soda soln is 1: 5～1: 3.Preferably, the temperature of described stripping reaction is 130 ℃～160 ℃.Preferably, the time of described stripping reaction is 1 hour～1.5 hours.The content of sodium oxide is 130g/L～500g/L in the described caustic soda soln, and preferably, the content of sodium oxide is 200g/L～400g/L in the caustic soda soln.Here the content of sodium oxide is meant that the content that content with sodium hydroxide in the caustic soda soln is converted into sodium oxide represents in the caustic soda soln that relates to.In the process of this stripping reaction, preferably, pressure parameter is controlled at 0.3Mpa～0.5Mpa, in this pressure range, can better make the speed of stripping reaction faster, and dissolution time is shorter.The liquid that obtains after the solid-liquid separation is low modulus liquid soluble glass, can send the ore concentration of bauxite workshop as preparation flotation agent or as binding agent according to concrete modulus and degree Beaume.
Step 30: adopt distilled water under 70 ℃～95 ℃, to wash Na in the washings that washing obtains the solid that obtains after the solid-liquid separation
2O content carries out wet magnetic separation again less than after 0.3%, can make iron ore concentrate.
The mass ratio of the distilled water of solid that obtains after the described solid-liquid separation and washing usefulness 1: 7～1: 5.Described magneticstrength of carrying out wet magnetic separation is 4000 Gausses～18000 Gausses, and preferably, the magneticstrength of carrying out wet magnetic separation is 7000 Gausses～13000 Gausses.After carrying out wet magnetic separation, what obtain is iron ore concentrate and non magnetic slag, and non magnetic slag can be used in the alumina by sintering flow process and prepare burden.The purpose of washing in this step mainly is to remove the liquid of iron ore concentrate in sepn process to adhere to alkali, and the distilled water of heat can strengthen the effect of washing greatly, washings is a caustic soda soln, and the content of sodium oxide is meant that the content that content with sodium hydroxide in the caustic soda soln is converted into sodium oxide represents in the washings.
With three embodiment the method that the present invention utilizes Bayer process red muddy sand to produce iron ore concentrate is done further detailed description below.
Embodiment one:
In the present embodiment, all iron content of red muddy sand is 45%, at first, with red muddy sand dry, fragmentation and grind grading, make that the granularity of red muddy sand is controlled at 30 microns behind the grind grading; After red muddy sand behind the grind grading and caustic soda soln mixed with mass ratio at 1: 3, carry out stripping reaction 0.5 hour under 160 ℃, 0.3Mpa, and carry out solid-liquid separation after reaction finishes, wherein, the content of sodium oxide is 200g/L in the caustic soda soln; At last, the solid that obtains after the solid-liquid separation is adopted distilled water, wherein, the solid masses ratio that obtains after distilled water and the solid-liquid separation is 3: 1, washs Na in the washings that washing obtains under 95 ℃
2O content is less than after 0.3%, carry out wet magnetic separation again under magneticstrength is 7000 Gausses' magnetic field, can make iron ore concentrate and non magnetic slag, the full iron amount TFe in the iron ore concentrate reaches 66, the utilization ratio of ferro element reaches 91% in the present embodiment, Al in the iron ore concentrate that makes
2O
3Content is 1.9%, SiO
2Content is 1.8%, and non magnetic slag is used for the alumina by sintering flow process prepares burden, and the liquid that obtains after the solid-liquid separation is delivered to the ore concentration of bauxite workshop as preparation flotation agent.
Embodiment two:
In the present embodiment, all iron content of red muddy sand is 47%, at first, with red muddy sand dry, fragmentation and grind grading, make that the granularity of red muddy sand is controlled at 70 microns behind the grind grading; After red muddy sand behind the grind grading and caustic soda soln mixed with mass ratio at 1: 5, carry out stripping reaction 2 hours under 130 ℃, 0.5Mpa, and carry out solid-liquid separation after reaction finishes, wherein, the content of sodium oxide is 400g/L in the caustic soda soln; At last, the solid that obtains after the solid-liquid separation is adopted distilled water, wherein, the solid masses ratio that obtains after distilled water and the solid-liquid separation is 5: 1, washs Na in the washings that washing obtains under 70 ℃
2O content is less than after 0.3%, carry out wet magnetic separation again under magneticstrength is 13000 Gausses' magnetic field, can make iron ore concentrate and non magnetic slag, the full iron amount TFe in the iron ore concentrate reaches 65.8, the utilization ratio of ferro element reaches 91.3% in the present embodiment, Al in the iron ore concentrate that makes
2O
3Content is 2.0%, SiO
2Content is 1.9%, and non magnetic slag is used for the alumina by sintering flow process prepares burden, and the liquid that obtains after the solid-liquid separation is delivered to the ore concentration of bauxite workshop as the preparation binding agent.
Embodiment three:
In the present embodiment, all iron content of red muddy sand is 50%, at first, with red muddy sand dry, fragmentation and grind grading, make that the granularity of red muddy sand is controlled at 50 microns behind the grind grading; After red muddy sand behind the grind grading and caustic soda soln mixed with mass ratio at 1: 4, carry out stripping reaction 1.5 hours under 150 ℃, 0.4Mpa, and carry out solid-liquid separation after reaction finishes, wherein, the content of sodium oxide is 300g/L in the caustic soda soln; At last, the solid that obtains after the solid-liquid separation is adopted distilled water, wherein, the solid masses ratio that obtains after distilled water and the solid-liquid separation is 4: 1, washs Na in the washings that washing obtains under 80 ℃
2O content is less than after 0.3%, carry out wet magnetic separation again under magneticstrength is 11000 Gausses' magnetic field, can make iron ore concentrate and non magnetic slag, the full iron amount TFe in the iron ore concentrate reaches 66.1, the utilization ratio of ferro element reaches 90.8% in the present embodiment, Al in the iron ore concentrate that makes
2O
3Content is 1.7%, SiO
2Content is 1.8%, and non magnetic slag is used for the alumina by sintering flow process prepares burden, and the liquid that obtains after the solid-liquid separation is delivered to the ore concentration of bauxite workshop as preparation flotation agent.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of utilizing Bayer process red muddy sand to produce iron ore concentrate is characterized in that, said method comprising the steps of:
Step 1: with red muddy sand dry, fragmentation and grind grading, make that the granularity of red muddy sand is controlled at 10 microns～90 microns behind the grind grading, described red muddy sand is an all iron content greater than 40% red muddy sand;
Step 2: after the red muddy sand behind the grind grading and caustic soda soln mixed with mass ratio in 1: 8～1: 2, under 110 ℃～180 ℃, 0.1MPa～0.6MPa, carry out stripping reaction 0.2 hour～2 hours, and after reaction finishes, carrying out solid-liquid separation, the content of sodium oxide is 130g/L～500g/L in the described caustic soda soln;
Step 3: adopt distilled water under 70 ℃～95 ℃, to wash Na in the washings that washing obtains the solid that obtains after the solid-liquid separation
2O content carries out wet magnetic separation again less than after 0.3%, can make iron ore concentrate.
2. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 1 is characterized in that, in the described step 1 behind the grind grading granularity of red muddy sand be controlled at 30 microns～70 microns.
3. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 1 is characterized in that the red muddy sand in the described step 2 behind the grind grading and the mass ratio of caustic soda soln 1: 5～1: 3.
4. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 1 is characterized in that, the temperature of stripping reaction is 130 ℃～160 ℃ in the described step 2.
5. the method for utilizing Bayer process red mud sand to produce iron ore concentrate according to claim 1 is characterized in that, the pressure of stripping reaction is 0.3MPa～0.5MPa in the described step 2.
6. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 1 is characterized in that, the time of stripping reaction is 1 hour～1.5 hours in the described step 2.
7. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 6 is characterized in that, the content of the interior sodium oxide of caustic soda soln is 200g/L～400g/L in the described step 2.
8. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 1 is characterized in that, the mass ratio of the distilled water of solid that obtains after the solid-liquid separation in the described step 3 and washing usefulness 1: 7～1: 5.
9. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 1 is characterized in that the magneticstrength of carrying out wet magnetic separation in the described step 3 is 4000 Gausses～18000 Gausses.
10. the method for utilizing Bayer process red muddy sand to produce iron ore concentrate according to claim 9 is characterized in that the magneticstrength of carrying out wet magnetic separation in the described step 3 is 7000 Gausses～13000 Gausses.
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| CN102328943A (en) * | 2011-06-21 | 2012-01-25 | 中国铝业股份有限公司 | Comprehensive utilization method of aluminum-containing minerals |
| CN110205430A (en) * | 2019-07-09 | 2019-09-06 | 广东工业大学 | A method of strengthening reduction roasting and recycles red mud iron component |
| CN116200608B (en) * | 2023-01-30 | 2023-12-05 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
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| CN1246082C (en) * | 2004-05-14 | 2006-03-22 | 山东铝业股份有限公司 | Method for selecting iron ore from red mud |
| CN101413054B (en) * | 2008-12-09 | 2010-07-14 | 中南大学 | Technology for comprehensively utilizing high ferro aluminiferous material |
| CN101624654A (en) * | 2009-04-17 | 2010-01-13 | 华中科技大学 | Method for recycling iron and aluminum by particle size grading pretreatment of Bayer process red mud |
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2010
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