CN111675231A - Red mud resource recovery and utilization process - Google Patents
Red mud resource recovery and utilization process Download PDFInfo
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- CN111675231A CN111675231A CN202010452427.0A CN202010452427A CN111675231A CN 111675231 A CN111675231 A CN 111675231A CN 202010452427 A CN202010452427 A CN 202010452427A CN 111675231 A CN111675231 A CN 111675231A
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- Prior art keywords
- red mud
- iron
- primary amine
- red
- sodium chloride
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 9
- 238000011084 recovery Methods 0.000 title abstract description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 10
- 239000011449 brick Substances 0.000 claims abstract description 8
- 125000002924 primary amino group Chemical class [H]N([H])* 0.000 claims abstract description 5
- 239000011734 sodium Substances 0.000 claims abstract description 5
- 239000011780 sodium chloride Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 4
- 239000001110 calcium chloride Substances 0.000 claims abstract description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 4
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 3
- 229960004887 ferric hydroxide Drugs 0.000 claims abstract 3
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims abstract 3
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract 3
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract 2
- 239000003245 coal Substances 0.000 claims abstract 2
- 238000007885 magnetic separation Methods 0.000 claims abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 12
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims 2
- 239000000347 magnesium hydroxide Substances 0.000 claims 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims 2
- 239000012141 concentrate Substances 0.000 claims 1
- 239000013078 crystal Substances 0.000 claims 1
- 238000002474 experimental method Methods 0.000 claims 1
- -1 iron ion Chemical class 0.000 claims 1
- 229910021645 metal ion Inorganic materials 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 239000002002 slurry Substances 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 abstract description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 229910001648 diaspore Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052598 goethite Inorganic materials 0.000 description 2
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910021646 siderite Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000036449 good health Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011022 opal Substances 0.000 description 1
- 239000004597 plastic additive Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000011121 sodium hydroxide 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
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910001773 titanium mineral Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
-
- 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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0409—Waste from the purification of bauxite, e.g. red mud
-
- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
- C04B33/1322—Red mud
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
-
- 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
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
Red mud is waste residue generated in the process of extracting aluminum oxide in the aluminum industry, is red due to the iron oxide, and is called red mud. The red mud is the largest waste residue generated in the production of alumina, and brings heavy burden to social environment. Production enterprises rely on large-area open-air places for stacking, and most of the dam bodies of the stacking fields are constructed by red mud. Many available components in the red mud are not developed yet, and resource waste is caused. With the rapid development of the aluminum industry and the reduction of ore grade, the red mud output will be larger and larger, so the recovery and utilization of red mud resources have become increasingly major research subjects and directions. The invention is characterized in that the red mud is sintered in a rotary kiln, iron oxide is changed into sodium ferrite at the temperature of 600-700 ℃, the sodium ferrite is hydrolyzed into ferric hydroxide, and the ferric hydroxide is removed by primary amine N-1923 reagent. And (3) recovering aluminum oxide, magnesium and calcium chloride, and recovering sodium chloride and recycling water. And (3) recycling ferroferric oxide by a residue magnetic separation method, and making bricks by using the residue and coal gangue.
Description
One, the technical field
The red mud is industrial waste residue with high alkali content discharged in the production process of alumina. Because bauxite contains high iron, the residue looks like red mud, which is called red mud. Generally, the alumina yield increases at a rate of more than 20% per year per 1 ton of alumina to discharge 0.5-1.5 tons of red mud, and thus the red mud amount will increase. The total discharge amount of red mud in China is billions of tons, and the quantity is incredible.
At present, no suitable method exists for treating the red mud, and the red mud is mostly stacked by damming. The method not only occupies a large amount of land and consumes a large amount of capital to build a huge storage yard and pay high maintenance cost, but also pollutes the surrounding environment of the storage yard and an underground water system, seriously damages the natural ecological environment and restricts the development of the alumina industry.
The invention relates to red mud treatment, which belongs to the technical field of environment, and the research subjects are environmental science and technology, environmental engineering and solid pollutant control engineering.
Second, background Art
The red mud is industrial alkali-containing waste residue discharged in the production process of alumina, and mainly comprises aragonite and calcite, and secondly comprises diaspore, goethite, a small amount of siderite, water glass, sodium aluminate and caustic soda, wherein the content of aluminum oxide is 10-22%, and the content of ferric oxide is 7.5-38%. The red mud contains various recyclable metal oxides, which becomes the basis for the recycling of the red mud.
The secondary comprehensive utilization of red mud has been reported in many scientific researches at home and abroad. For example, iron and titanium are extracted from red mud, and the extracted red mud is used as a plastic additive or a silicon fertilizer to produce cement and other building materials, road building materials, mine filling materials and the like. However, the implementation is limited, and the reason is that the content of strong base in the red mud exceeds the standard, which seriously affects the bulk utilization of the red mud.
Foreign red mud treatment
Alumina factories in France, America, Japan, etc. are built by the sea and directly discharged to the sea. Australia is an alumina plant in Queensland and some alumina plants built near the coast in Western Australia, the red mud is washed by seawater by utilizing the advantage of sea approach, the pH value of the red mud is reduced to less than 10, and stacking is carried out, so that the seepage-proofing cost for building a red mud stacking yard can be reduced.
Reference to the literature
1. 1-Congly Y，Kiy,Erson M，Recovery and Concen Traction of AL(Ⅲ),Fe(Ⅲ),Ti(Ⅳ)，Na(I)From，red mud[J].Joural of Colloid and insteace Science,2001,24(2):342～346.
2.Mishra B,Stdey A.,Recovery of value added Products from red muf[J].Mincrals and Metallurgical procesrning.Society for cuiaing,Metalluny ang ECPlocation,2002，19(a2)：87～89.
Domestic red mud treatment
1. Preparation of baked brick
The red mud has fine granularity, soft quality and certain plasticity, and can replace clay to be used as a raw material for producing the baked bricks. The method consumes a large amount of red mud, does not need to add new equipment, and saves 70% of clay. But the mechanical degree in the brick making process is low, the alkalinity of workers contacting red mud is strong, and the workers are easy to cause damage to human bodies.
2. For cement production
The red mud also contains a large amount of calcium, which can replace part of raw materials to produce different varieties of cement. Because the alkali content of the red mud is high, the low alkali characteristic required by cement production cannot be achieved when the dosage of the red mud is too much. Meanwhile, the labor protection and the equipment use of workers are highly required, and the difficulty of the technology popularization is increased.
3. As roadbed material
The red mud is used as a novel road base material, has better freezing stability, drying shrinkage and temperature shrinkage, is a comprehensive utilization mode with larger consumption of the red mud, and can be used only after comprehensive curing technologies such as pressure-alkali stabilization, ion exchange, red mud activation, pressure forming and the like.
4. Recovery of iron
Most patents are that red mud is pre-roasted, then ferric oxide is reduced by a fluidized bed furnace at the temperature of 700 ℃ and 800 ℃ to be changed into ferroferric oxide, and then the ferroferric oxide is cooled, crushed and magnetically separated to finally obtain iron fine powder with the concentration of more than 63 percent. According to data statistics, the content of ferric oxide in foreign red mud is between 30 and 52 percent, and the content of ferric oxide in domestic red mud is between 7 and 39 percent, but the method requires that the content of iron in red mud is high, namely, the red mud only can be treated by Bayer process, and the red mud is difficult to be utilized by sintering process and combination process.
Reference to the literature
1. Wang culture: research on the production of baked bricks from industrial waste red mud [ J ]. masonry, 2006 (below): 42-43.
2. Liu Chun, Yi national gan: study on concrete production from red mud by sintering process [ J ]. comprehensive utilization of chinese resources, 2007, (3): 17-19.
3. Broad yang family, good health, good peach kernel, etc.: examples of engineering applications of sintering-process red mud road materials and economic analysis [ J ] light metals, 2007, (2):18-21
4. Huangzhu, Sun Zong Yi, left-language: the iron-containing red mud reduction and separation mechanism is discussed in J. 1992, (4): 23-29.
Third, the invention
According to the physical and chemical properties of the red mud, the red mud is roasted by a rotary furnace, then treated by acid leaching, and subjected to solid-liquid separation to obtain products such as aluminum hydroxide, iron, magnesium, calcium chloride, sodium and the like in solution in stages.
The experimental result shows that after the ore is roasted by water, slag and liquid are separated. The solution is treated with primary amine N-1923 for iron removal. The solution is adjusted in pH to obtain aluminum, magnesium, hydroxide and magnesium and sodium chloride. The dealkalized red mud can be completely used for making bricks, cement or paving base materials. The quality of various products reaches the corresponding industrial standard. The treatment cost is controllable, so that the red mud treatment has certain economic benefit.
Fourthly, the concrete implementation steps
The red mud obtained by different processes in the production of alumina has different chemical components and phase compositions. The red mud mineral components are measured by means of a polarizing microscope, a scanning electron microscope and the like, and the red mud mineral components are considered to mainly comprise aragonite and calcite, and then opal, diaspore, goethite, a small amount of titanium mineral, siderite, sodium aluminate and caustic alkali. The method adopts roasting and acid leaching modes to dissolve metal oxides in the red mud and eliminate the alkalinity of the red mud so as to obtain useful metal oxides, and the residual slag can be used as a treatment method of building materials, thereby being the key for solving the problems of recycling and utilizing red mud resources at present.
Claims (3)
1. The red mud resource recovering and utilizing process is that high temperature rotary kiln roasting is adopted and water is added to prepare slurry based on the physical and chemical properties of red mud. Under alkaline condition, sodium ferrite is hydrolyzed into solution composed of ferric hydroxide, aluminum hydroxide, magnesium hydroxide, calcium chloride, sodium chloride and the like.
2. The method as claimed in claim 1, wherein the technical features are: and (3) carrying out filter pressing separation on the solution containing the metal ions, and adding primary amine N-1923 into the solution to serve as a directional iron remover. The feed ratio is Fe3+1:0.6 primary amine N-1923, namely 1mol of iron ion is compared with 0.6mol of primary amine reagent, the iron removal solution is used for precipitating aluminum hydroxide when the pH value is adjusted to 4.7-5.8 by hydrochloric acid (20 percent), and then the pH value is adjusted to about 10-11 to obtain the magnesium hydroxide. Sodium chloride is used as seed crystal, calcium and sodium chloride are recovered, and water is recycled.
3. The iron-containing concentrate is recovered from the red mud residue by a magnetic separation method and is less than or equal to 55 percent. The residual slag is added with 75:25(W/W) of coal gangue for mixed brick making, and the compressive strength of the brick body reaches 10-15MPa in the experiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010452427.0A CN111675231A (en) | 2020-05-26 | 2020-05-26 | Red mud resource recovery and utilization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010452427.0A CN111675231A (en) | 2020-05-26 | 2020-05-26 | Red mud resource recovery and utilization process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111675231A true CN111675231A (en) | 2020-09-18 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010452427.0A Pending CN111675231A (en) | 2020-05-26 | 2020-05-26 | Red mud resource recovery and utilization process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111675231A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116589261A (en) * | 2023-06-27 | 2023-08-15 | 山东高速材料技术开发集团有限公司 | Modified low-shrinkage low-carbon gel material utilizing red mud and preparation method thereof |
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2020
- 2020-05-26 CN CN202010452427.0A patent/CN111675231A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116589261A (en) * | 2023-06-27 | 2023-08-15 | 山东高速材料技术开发集团有限公司 | Modified low-shrinkage low-carbon gel material utilizing red mud and preparation method thereof |
| CN116589261B (en) * | 2023-06-27 | 2024-01-26 | 山东高速材料技术开发集团有限公司 | Modified low-shrinkage low-carbon gel material utilizing red mud and preparation method thereof |
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Application publication date: 20200918 |