CN115744948B - Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite - Google Patents
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite Download PDFInfo
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- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 62
- 229910001919 chlorite Inorganic materials 0.000 title claims abstract description 34
- 229910052619 chlorite group Inorganic materials 0.000 title claims abstract description 34
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 title claims description 17
- 238000011978 dissolution method Methods 0.000 title claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000007800 oxidant agent Substances 0.000 claims abstract description 36
- 230000001590 oxidative effect Effects 0.000 claims abstract description 32
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 31
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 31
- 239000004571 lime Substances 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000004131 Bayer process Methods 0.000 claims abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000012141 concentrate Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 238000004090 dissolution Methods 0.000 claims description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 32
- 238000007885 magnetic separation Methods 0.000 claims description 14
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 12
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 12
- 239000003513 alkali Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical group O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 239000012286 potassium permanganate Substances 0.000 claims description 4
- 235000010344 sodium nitrate Nutrition 0.000 claims description 4
- 239000004317 sodium nitrate Substances 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 2
- 238000002386 leaching Methods 0.000 claims 1
- 230000029087 digestion Effects 0.000 abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000010413 mother solution Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910001608 iron mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- -1 magnetochlorite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a Fe-containing alloy 2+ A method for dissolving out chlorite type deposited bauxite. The invention adopts the lime Bayer process digestion process, and simultaneously adds the oxidant, and solves the problem of Fe-containing by adding the oxidant into the bauxite digestion system 2+ The chlorite mineral of (2) cannot be dissociated under the condition of the conventional lime Bayer process. Compared with the traditional lime Bayer process digestion process, the method provided by the invention can improve the recovery rate of alumina and the grade of the iron concentrate powder for selecting iron from red mud.
Description
Technical Field
The invention relates to the technical field of alumina production, in particular to a Fe-containing alloy 2+ A method for dissolving out chlorite type deposited bauxite.
Background
Containing Fe 2+ The chlorite deposition bauxite has high impurity content, low grade and low alumina recovery rate, no mature and independent smelting production process for the deposition bauxite exists, and the exploitation utilization amount is small. The chemical components are as follows: al (Al) 2 O 3 44.58-48.73％、SiO 2 9.18-13.20％、Fe 2 O 3 21.39-27.76％、TiO 2 4.32-5.05％、CaO0.06-0.30％、A/S3.35-6.91(Al 2 O 3 With SiO 2 The mass percentage ratio of (c).
Containing Fe 2+ The phase composition of the chlorite deposition type bauxite is as follows: diasporite, magnetochlorite, magnesia-containing chlorite, oolitic chlorite, iron oxide and rutile, and in addition small amounts of siderite and illite. The conventional lime Bayer process has low alumina dissolution rate and low grade of the iron-producing refined powder produced by selecting iron from red mud, and the main reason is that the chlorite of part of iron, aluminum and silicon-containing minerals is not dissociated.
At present, over 90% of aluminum oxide in the world is leached by Bayer process, and the basic principle is to treat aluminum ore with alkali liquor (NaOH) to convert the aluminum oxide in the ore into sodium aluminate solution. Impurities such as iron and titanium in the ore and most of silicon become insoluble compounds, insoluble residues are separated from the solution and washed, useful components in the insoluble residues are recovered, and the rest is piled up. The pure sodium aluminate solution is decomposed to separate out aluminum hydroxide, and the aluminum hydroxide is separated from mother solution, washed and roasted to obtain an aluminum oxide product. The decomposed mother solution can be recycled to process the next batch of ores.
The prior art generally adopts a lime Bayer digestion process to recycle alumina in bauxite, but adopts the method to treat Fe-containing material 2+ When the chlorite type bauxite is used, the relative dissolution rate of alumina is low, and the dissolved red mud is magnetically separated, so that the grade of the produced iron fine powder is low.
Disclosure of Invention
In view of this, the present invention provides a Fe-containing alloy 2+ A dissolution method of chlorite type deposited bauxite comprises the steps of adding solid, liquid or gaseous oxidant into a bauxite dissolution system to solve the problem of Fe content 2+ The chlorite mineral does not dissociate under conventional lime bayer process conditions. Compared with the existing conventional lime Bayer process digestion process, the recovery rate of alumina can be improved by about 10%, meanwhile, the separation of iron minerals and aluminum silicon minerals is facilitated, the separation of red mud into iron is facilitated, and the grade of the product iron concentrate is improved by about 28%.
The invention contains Fe 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; and then carrying out magnetic separation on the red mud under the magnetic field condition to produce the iron concentrate.
Preferably, the digestion conditions of the lime bayer process are: the concentration of the alkali liquor is 230-250g/L, al 2 O 3 The concentration of (2) is 110-120g/L; the pre-desilication temperature is 100-110 ℃, and the pre-desilication time is 240-480min; the dissolution temperature is 260-270 ℃, and the dissolution time is 30-90min; lime addition accounts for 4-16% of the dry weight of bauxite; bauxite addition amount is 400-480g/L; the grinding granularity is less than 63 mu m and accounts for 60-90 percent; the alkali liquor is NaOH solution containing sodium aluminate.
More preferably, the dissolution time is 40-60min, the lime addition amount is 8-12% of the dry weight of the bauxite, and the bauxite addition amount is 420-460g/L.
Preferably, the oxidizing agent is one or more of a solid oxidizing agent, a liquid oxidizing agent or a gaseous oxidizing agent.
Preferably, the solid oxidant is potassium permanganate or sodium nitrate; the addition amount of the solid oxidant accounts for 0.5-5% of the dry weight of the bauxite.
Preferably, the liquid oxidant is hydrogen peroxide (with the concentration of 50%) or nitric acid (with the concentration of 68%); the addition amount of the liquid oxidant accounts for 2-8% of the dry weight of the bauxite.
Preferably, the gaseous oxidant is pure oxygen or ozone; the partial pressure of the gaseous oxidant is 0.6-1.5MPa.
Preferably, the magnetic field strength is 0.8-1T.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a Fe-containing alloy 2+ A dissolution method of chlorite type deposited bauxite comprises the steps of adding solid, liquid or gaseous oxidant into a bauxite dissolution system to solve the problem of Fe content 2+ The chlorite mineral cannot be dissociated under the condition of the conventional lime Bayer process. Compared with the existing conventional lime Bayer process digestion process, the recovery rate of alumina can be improved by about 10%, meanwhile, the separation of iron minerals and aluminum silicon minerals is facilitated, the separation of red mud into iron is facilitated, and the grade of the product iron concentrate is improved by about 28%.
Detailed Description
The present invention will be further described with reference to examples and comparative examples. The examples and comparative examples both employ a lime bayer digestion process, the basic principle being the treatment of aluminium ore (lime added if necessary) with lye (NaOH) to convert the alumina in the ore to a sodium aluminate solution. Impurities such as iron and titanium in the ore and most of silicon become insoluble compounds, insoluble residues are separated from the solution and washed, useful components in the insoluble residues are recovered, and the rest is piled up. The pure sodium aluminate solution is decomposed to separate out aluminum hydroxide, and the aluminum hydroxide is separated from mother solution, washed and roasted to obtain an aluminum oxide product. The decomposed mother solution can be recycled to process the next batch of ores.
The ore component in the examples and comparative examples of the present invention was Al 2 O 3 49.15％、SiO 2 10.86％、Fe 2 O 3 21.39％、TiO 2 4.32％、CaO0.19％、A/S4.52(Al 2 O 3 With SiO 2 The mass percentage ratio of (c).
Example 1
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; then carrying out magnetic separation on the red mud under the magnetic field condition to produce iron concentrate;
the dissolution conditions of the lime Bayer process are as follows: adding NaOH solution containing sodium aluminate as alkali liquor, using Na 2 O meter with concentration of 245g/L, al 2 O 3 Is 118g/L; the pre-desilication temperature is 105 ℃, and the pre-desilication time is 300min; the dissolution temperature is 270 ℃, the dissolution time is 60min, and the addition amount of lime (CaO) accounts for 10% of the dry weight of bauxite; bauxite addition amount is 450g/L; the grinding granularity is less than 63 mu m and accounts for 73 percent;
the oxidant added in the reaction process is potassium permanganate, and the potassium permanganate accounts for 2% of the dry weight of bauxite.
The relative dissolution rate of the alumina is 95.56%; and (3) carrying out magnetic separation on the dissolved red mud under the condition of magnetic field strength of 1T, wherein the grade (TFe) of the produced iron concentrate is 47.26%.
Example 2
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; then carrying out magnetic separation on the red mud under the magnetic field condition to produce iron concentrate;
the dissolution conditions of the lime Bayer process are as follows: adding NaOH solution containing sodium aluminate as alkali liquor, using Na 2 O meter with concentration of 245g/L, al 2 O 3 Is 118g/L; the pre-desilication temperature is 105 ℃, and the pre-desilication time is300min; the dissolution temperature is 270 ℃; the dissolution time is 60min, and the addition amount of lime (CaO) accounts for 10% of the dry weight of bauxite; bauxite addition amount is 450g/L; the grinding granularity is less than 63 mu m and accounts for 73 percent;
the oxidant added in the reaction process is sodium nitrate, and the sodium nitrate accounts for 3.5% of the dry weight of bauxite.
The relative dissolution rate of the alumina is 95.10%; and (3) carrying out magnetic separation on the dissolved red mud under the condition of magnetic field strength of 1T, wherein the grade (TFe) of the produced iron concentrate is 46.23%.
Example 3
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; then carrying out magnetic separation on the red mud under the magnetic field condition to produce iron concentrate;
the dissolution conditions of the lime Bayer process are as follows: adding NaOH solution containing sodium aluminate as alkali liquor, using Na 2 O meter with concentration of 245g/L, al 2 O 3 Is 118g/L; the pre-desilication temperature is 105 ℃, and the pre-desilication time is 300min; the dissolution temperature is 270 ℃; the dissolution time is 60min, and the addition amount of lime (CaO) accounts for 10% of the dry weight of bauxite; bauxite addition amount is 450g/L; the grinding granularity is less than 63 mu m and accounts for 73 percent;
the oxidant added during the reaction is nitric acid (concentration is 68%), the nitric acid accounts for 3% of the dry weight of bauxite.
The relative dissolution rate of the alumina is 94.23%; and (3) carrying out magnetic separation on the dissolved red mud under the condition of magnetic field strength of 1T, wherein the grade (TFe) of the produced iron concentrate is 44.12%.
Example 4
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; then carrying out magnetic separation on the red mud under the magnetic field condition to produce iron concentrate;
the dissolution conditions of the lime Bayer process are as follows: adding NaOH solution containing sodium aluminate asAlkali liquor, na 2 O meter with concentration of 245g/L, al 2 O 3 Is 118g/L; the pre-desilication temperature is 105 ℃, and the pre-desilication time is 300min; the dissolution temperature is 270 ℃; the dissolution time is 60min, and the addition amount of lime (CaO) accounts for 10% of the dry weight of bauxite; bauxite addition amount is 450g/L; the grinding granularity is less than 63 mu m and accounts for 73 percent;
the oxidant added in the reaction process is hydrogen peroxide, and the hydrogen peroxide accounts for 5% of the dry weight of bauxite.
The relative dissolution rate of the alumina is 93.56%; and (3) carrying out magnetic separation on the dissolved red mud under the condition of magnetic field strength of 1T, wherein the grade (TFe) of the produced iron concentrate is 42.26%.
Example 5
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; then carrying out magnetic separation on the red mud under the magnetic field condition to produce iron concentrate;
the dissolution conditions of the lime Bayer process are as follows: adding NaOH solution containing sodium aluminate as alkali liquor, using Na 2 O meter with concentration of 245g/L, al 2 O 3 Is 118g/L; the pre-desilication temperature is 105 ℃, and the pre-desilication time is 300min; the dissolution temperature is 270 ℃; the dissolution time is 60min, and the addition amount of lime (CaO) accounts for 10% of the dry weight of bauxite; bauxite addition amount is 450g/L; the grinding granularity is less than 63 mu m and accounts for 73 percent;
the oxidant added in the reaction process is pure oxygen, and the partial pressure of the pure oxygen is 1.0MPa.
The relative dissolution rate of the alumina is 96.23%; and (3) carrying out magnetic separation on the dissolved red mud under the condition of magnetic field strength of 1T, wherein the grade (TFe) of the produced iron concentrate is 48.20%.
Comparative example 1
Fe-containing material 2+ Dissolution method of chlorite type deposited bauxite, which is specific to Fe-containing materials 2+ The chlorite type deposited bauxite is subjected to lime Bayer process to dissolve out alumina, and red mud is obtained; then carrying out magnetic separation on the red mud under the magnetic field condition to produce iron concentrate;
the dissolution conditions of the lime Bayer process are as follows: adding NaOH solution containing sodium aluminate as alkali liquor, using Na 2 O meter with concentration of 245g/L, al 2 O 3 Is 118g/L; the pre-desilication temperature is 105 ℃, and the pre-desilication time is 300min; the dissolution temperature is 270 ℃; the dissolution time is 60min, and the addition amount of lime (CaO) accounts for 10% of the dry weight of bauxite; bauxite addition amount is 450g/L; the grinding granularity is less than 63 mu m and accounts for 73 percent;
the relative dissolution rate of the alumina is 86%; and (3) carrying out magnetic separation on the dissolved red mud under the condition of magnetic field strength of 1T, wherein the grade (TFe) of the produced iron concentrate is 35%.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. Fe-containing material 2+ A method for leaching chlorite type sedimentary bauxite, which is characterized in that Fe-containing ore is dissolved in the bauxite 2+ The chlorite type deposited bauxite is dissolved out by a lime Bayer process, and simultaneously an oxidant is added to dissolve out alumina and obtain red mud; then carrying out magnetic separation on the red mud under the condition of a strong magnetic field to produce iron concentrate;
the oxidant is one or more of solid oxidant, liquid oxidant or gaseous oxidant;
the solid oxidant is potassium permanganate or sodium nitrate; the addition amount of the solid oxidant accounts for 0.5-5% of the dry weight of bauxite;
the liquid oxidant is hydrogen peroxide or nitric acid; the addition amount of the liquid oxidant accounts for 2-8% of the dry weight of bauxite;
the gaseous oxidant is pure oxygen or ozone; the partial pressure of the gaseous oxidant is 0.6-1.5MPa.
2. The Fe-containing alloy according to claim 1 2+ The dissolution method of the chlorite type deposited bauxite is characterized in that the dissolution conditions of the lime Bayer process are as follows: alkaliThe concentration of the liquid is 230-250g/L, al 2 O 3 The concentration of (2) is 110-120g/L; the pre-desilication temperature is 100-110 ℃, and the pre-desilication time is 240-480min; the dissolution temperature is 260-270 ℃, and the dissolution time is 30-90min; lime addition accounts for 4-16% of the dry weight of bauxite; bauxite addition amount is 400-480g/L; the grinding granularity is less than 63 mu m and accounts for 60-90 percent; the alkali liquor is NaOH solution containing sodium aluminate.
3. The Fe-containing alloy according to claim 1 2+ The dissolution method of the chlorite type deposited bauxite is characterized in that the dissolution time is 40-60min, the lime addition amount accounts for 8-12% of the dry weight of the bauxite, and the bauxite addition amount is 420-460g/L.
4. The Fe-containing alloy according to claim 1 2+ The dissolution method of the chlorite type deposited bauxite is characterized in that the magnetic field strength is 0.8-1T.
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| WO2002036493A1 (en) * | 2000-10-30 | 2002-05-10 | Showa Denko K. K. | Method of separating red mud containing goethite |
| CN101734698A (en) * | 2009-09-08 | 2010-06-16 | 东北大学 | Method for preparing aluminum oxide from aluminiferous material |
| CN102502746A (en) * | 2011-10-14 | 2012-06-20 | 中南大学 | Method for removing S<2-> from sodium aluminate solution |
| CN103395796A (en) * | 2013-08-13 | 2013-11-20 | 南阳东方应用化工研究所 | Comprehensive utilization method of serpentine and device used by method |
-
2022
- 2022-09-08 CN CN202211097327.6A patent/CN115744948B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5068095A (en) * | 1986-07-31 | 1991-11-26 | Aluminum Company Of America | Method for reducing the amount of colorants in a caustic liquor |
| WO2002036493A1 (en) * | 2000-10-30 | 2002-05-10 | Showa Denko K. K. | Method of separating red mud containing goethite |
| CN101734698A (en) * | 2009-09-08 | 2010-06-16 | 东北大学 | Method for preparing aluminum oxide from aluminiferous material |
| CN102502746A (en) * | 2011-10-14 | 2012-06-20 | 中南大学 | Method for removing S<2-> from sodium aluminate solution |
| CN103395796A (en) * | 2013-08-13 | 2013-11-20 | 南阳东方应用化工研究所 | Comprehensive utilization method of serpentine and device used by method |
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