CN115069402A - Method for treating sulfur-containing bauxite - Google Patents
Method for treating sulfur-containing bauxite Download PDFInfo
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- CN115069402A CN115069402A CN202210753839.7A CN202210753839A CN115069402A CN 115069402 A CN115069402 A CN 115069402A CN 202210753839 A CN202210753839 A CN 202210753839A CN 115069402 A CN115069402 A CN 115069402A
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- 239000011593 sulfur Substances 0.000 title claims abstract description 159
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 159
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 238000000034 method Methods 0.000 title claims abstract description 62
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 56
- 239000012141 concentrate Substances 0.000 claims abstract description 126
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 75
- 230000023556 desulfurization Effects 0.000 claims abstract description 75
- 230000005484 gravity Effects 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 38
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 30
- 239000011707 mineral Substances 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 18
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 239000004115 Sodium Silicate Substances 0.000 claims description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 8
- 239000001110 calcium chloride Substances 0.000 claims description 8
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 8
- 239000012047 saturated solution Substances 0.000 claims description 8
- 229910001648 diaspore Inorganic materials 0.000 claims description 7
- 229910052604 silicate mineral Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000000470 constituent Substances 0.000 claims description 4
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 claims description 4
- 229910001773 titanium mineral Inorganic materials 0.000 claims description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 2
- 229910001679 gibbsite Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000000227 grinding Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- 238000002156 mixing Methods 0.000 description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000010494 dissociation reaction Methods 0.000 description 5
- 230000005593 dissociations Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- 238000004131 Bayer process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910001593 boehmite Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 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
- 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
- 238000002360 preparation method Methods 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052903 pyrophyllite Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
Classifications
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- 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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
-
- 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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/44—Application of particular media therefor
- B03B5/442—Application of particular media therefor composition of heavy media
-
- 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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- 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
Abstract
The invention particularly relates to a method for treating sulfur-containing bauxite, which belongs to the technical field of mineral processing and comprises the following steps: carrying out crushing and grading treatment on the sulfur-containing bauxite to obtain a coarse fraction material and a fine fraction material; performing first desulfurization on the coarse fraction material to obtain a first concentrate and a first sulfur concentrate; performing second desulfurization on the fine fraction material to obtain a second concentrate and a second sulfur concentrate; wherein the first desulfurization is gravity separation desulfurization, and the second desulfurization is centrifugal ore dressing desulfurization; the method comprises the steps of crushing and grading, gravity separation and desulfurization of coarse-fraction materials, centrifugal ore dressing and desulfurization of fine-fraction materials, and can obtain sulfur concentrate with high sulfur content without grinding mineral aggregate to a certain granularity, so that aluminum concentrate with low sulfur content and high recovery rate is obtained.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a method for treating sulfur-containing bauxite.
Background
Along with the expansion of Chinese alumina production capacity, the quality of domestic bauxite is sharply reduced, and in order to ensure the demand of alumina enterprises on the ore, the domestic low-quality bauxite needs to be processed to meet the demand of alumina production raw materials. The sulfur-containing bauxite usually has the characteristics of high alumina content and high alumina-silica ratio, and the aluminum oxide flow is scabbed due to the direct Bayer process production of the sulfur-containing bauxite, equipment is seriously corroded, and an aluminum oxide product is colored, so that the product is unqualified. In recent years, various alumina enterprises use sulfur-containing bauxite in a ore blending mode, and only part of bauxite with lower sulfur content can be consumed in the mode; the method is mainly used for solving the problems that the sulfur mineral in the bauxite is removed by roasting desulfurization and flotation desulfurization in part of alumina enterprises, and large-area industrial popularization cannot be realized due to high production cost, large factory building investment and the like, so that a low-cost and high-efficiency desulfurization method is urgently needed to be developed for the sulfur-containing bauxite, the sulfur content of aluminum concentrate is effectively reduced, the amount of alumina ore produced by the economic Bayer process of the bauxite in China is increased, and the method has great significance for enhancing the market competitiveness and the sustainable development of the alumina enterprises in China.
The process for desulfurizing the high-sulfur bauxite at home and abroad mainly adopts roasting, flotation process, gravity separation process and the like, the adopted desulfurization process needs to grind the bauxite to a certain granularity, the beneficiation cost is relatively high, the adaptability of the technology to the bauxite is relatively poor, the technology cannot cope with the current nervous ore situation, and the economic and technical requirements of the alumina enterprises on the domestic bauxite at present cannot be met.
Disclosure of Invention
The application aims to provide a method for treating sulfur-containing bauxite, which aims to solve the problem of high beneficiation cost caused by the fact that the conventional sulfur-containing bauxite needs to be ground to a certain granularity for desulfurization.
The embodiment of the invention provides a method for treating sulfur-containing bauxite, which comprises the following steps:
carrying out crushing and grading treatment on the sulfur-containing bauxite to obtain a coarse fraction material and a fine fraction material;
performing first desulfurization on the coarse fraction material to obtain a first concentrate and a first sulfur concentrate;
performing second desulfurization on the fine fraction material to obtain a second concentrate and a second sulfur concentrate;
wherein the first desulfurization is gravity separation desulfurization, and the second desulfurization is centrifugal ore dressing desulfurization.
Optionally, the feeding pressure of the gravity desulfurization is 0.1-0.5 MPa.
Optionally, the sorting density of the gravity separation desulfurization is 2.5-3.3g/cm 3 ；
The medium for gravity desulfurization comprises one of water, a saturated solution of calcium chloride and a solution of sodium silicate;
the heavy material for gravity desulfurization comprises at least one of magnetite and ferrosilicon;
the particle size of the magnetite and the ferrosilicon is less than 0.038 mm.
Optionally, the gravity desulfurization is performed by using a dense medium cyclone, and the dense medium cyclone is a three-product dense medium cyclone.
Optionally, the separation density of the centrifugal ore dressing desulfurization is 2.5-3.5g/cm 3 ；
The medium for centrifugal ore dressing and desulfurization comprises one of water, a saturated solution of calcium chloride and a solution of sodium silicate;
the weighting material for centrifugal ore dressing desulfurization comprises at least one of magnetite and ferrosilicon;
the particle size of the magnetite and the ferrosilicon is less than 0.038 mm.
Optionally, the equipment for centrifugal ore dressing and desulfurization is a water jacket type centrifuge.
Optionally, the particle size of the coarse-fraction material is n-10mm, the particle size of the fine-fraction material is 0-n mm, wherein n is a particle size boundary value of the coarse-fraction material and the fine-fraction material, and the value of n is 0.074-3.
Optionally, the sulfur content of the sulfur-containing bauxite is greater than 0.8% by mass.
Optionally, the crushing equipment for crushing and grading treatment comprises a jaw crusher and a double-roll crusher, and the grading equipment for crushing and grading treatment comprises a grader, a cyclone, a linear sieve and a high-frequency sieve.
Optionally, the components of the first concentrate comprise diaspore and silicate minerals;
the constituents of the second concentrate include gibbsite and silicate minerals;
the composition of the first sulfur concentrate comprises an iron-titanium mineral;
the second sulfur concentrate includes a ferro-titanium mineral.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for treating the sulfur-containing bauxite provided by the embodiment of the invention comprises the steps of crushing and grading, gravity separation and desulfurization of coarse-fraction materials, centrifugal ore dressing and desulfurization of fine-fraction materials, and can be used for obtaining sulfur concentrate with high sulfur content and aluminum concentrate with low sulfur content and higher recovery rate without grinding mineral aggregate to a certain granularity.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a process flow diagram provided by an embodiment of the present invention;
fig. 2 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
aiming at the problems of poor beneficiation effect, high beneficiation cost, complex process flow, large equipment investment of a beneficiation plant and the like of the existing desulfurization process of the sulfur-containing bauxite, the process adopts the processes of crushing-grading, coarse fraction heavy-medium beneficiation desulfurization and fine fraction centrifugal beneficiation desulfurization to treat the sulfur-containing bauxite, so that sulfur concentrate with high sulfur content can be obtained, and aluminum concentrate with low sulfur content can be obtained.
According to an exemplary embodiment of the present invention, there is provided a method of treating sulfur-containing bauxite, the method including:
s1, crushing and grading sulfur-containing bauxite to obtain a coarse-grained material and a fine-grained material;
the useful minerals in the sulfur-containing bauxite include low-density minerals such as diaspore (diaspore and boehmite), kaolinite, illite, chlorite, pyrophyllite, quartz and calcite, and the gangue minerals mainly include high-density minerals such as pyrite, hematite, goethite, anatase and rutile.
In some embodiments, the coarse fraction material has a particle size of n-10mm, and the fine fraction material has a particle size of 0-n mm, where n is the particle size cut-off value of the coarse fraction material and the fine fraction material, and the value of n is between 0.074 and 3.
The grain size boundary value of the coarse-fraction material and the fine-fraction material is controlled to be between 0.074 and 3, if the grain size of the heavy medium cyclone and the centrifuge is increased, the final sulfur content and the sulfur content of the sulfur concentrate are directly influenced, mainly because the sulfur mineral in the sulfur-containing bauxite and other minerals are complex in embedding relationship and have fine embedding grain size, the dissociation of the minerals is insufficient under the condition of coarse grain size, the sulfur content of the sulfur concentrate in the separation process is low, the sulfur content of the concentrate is high, and the separation effect is directly influenced.
In some embodiments, the sulfur-containing bauxite has a sulfur content greater than 0.8% by mass.
Specifically, the crushing equipment for crushing and grading treatment comprises a jaw crusher and a roll crusher, and the grading equipment for crushing and grading treatment comprises a grader, a cyclone, a linear sieve and a high-frequency sieve.
In the embodiment, the crushing equipment is a combination of a jaw crusher and a double-roller crusher, the crushing process is a closed circuit with two sections and one pair, and the content of the crushed particle size fraction below 10mm accounts for 100 percent; the grading equipment is a grader, a swirler, a linear sieve and a high-frequency sieve which are used in combination.
S2, performing first desulfurization on the coarse fraction material, wherein the first desulfurization is gravity desulfurization to obtain a first concentrate and a first sulfur concentrate;
in some embodiments, the gravity desulfurization is performed by using a dense medium cyclone, specifically, in this embodiment, the dense medium cyclone is a three-product dense medium cyclone.
In some embodiments, the feed pressure for the gravity desulfurization is 0.1 to 0.5 MPa.
The feeding pressure is controlled to be 0.1-0.5MPa, if the feeding pressure of the dense medium cyclone is reduced, the separation index of the concentrate and the tailings can be influenced, mainly because the feeding pressure is insufficient, the centrifugal force is low, and the separation of the sulfur mineral from other minerals can not be well realized.
In some embodiments, the sorting density for gravity desulfurization is 2.5-3.3g/cm 3 ；
The medium for gravity desulfurization comprises one of water, a saturated solution of calcium chloride and a solution of sodium silicate;
the heavy material for gravity desulfurization comprises at least one of magnetite and ferrosilicon;
the particle size of the magnetite and the ferrosilicon is less than 0.038 mm.
Specifically, in this embodiment, the mass ratio of the medium for gravity separation and desulfurization to the heavy material is 1:2.35 to 1:4.45, and those skilled in the art can prepare the medium according to the density required by the experiment.
The separation density for controlling gravity separation and desulfurization is 2.5-3.3g/cm 3 If the separation density of the dense medium cyclone is reduced, the separation indexes of the concentrate and the sulfur concentrate are influenced, mainly because the sulfur mineral can be separated out through overflow of a cyclone under the condition of lower separation density and better dissociation of the sulfur mineral and other minerals, the yield of the sulfur concentrate is higher, the sulfur content in the sulfur concentrate is lower, and the yield of the concentrate is lower.
Generally, the constituents of the first concentrate include diaspore (including diaspore and boehmite) and silicate minerals, suitable for the bayer process for the production of alumina; the components of the first sulfur concentrate include iron-titanium minerals, which can be pyrites, hematites, etc., and can be sold as products.
S3, performing second desulfurization on the fine-grained material, wherein the second desulfurization is centrifugal ore dressing desulfurization to obtain a second concentrate and a second sulfur concentrate;
specifically, in this embodiment, the equipment for centrifugal ore dressing and desulfurization is a water jacket centrifuge.
In some embodiments, the centrifugal beneficiation desulfurization has a sorting density of 2.5 to 3.5g/cm 3 ；
The medium for centrifugal ore dressing and desulfurization comprises one of water, a saturated solution of calcium chloride and a solution of sodium silicate;
the weighting material for centrifugal ore dressing desulfurization comprises at least one of magnetite and ferrosilicon;
the particle size of the magnetite and the ferrosilicon is less than 0.038 mm.
Specifically, in this embodiment, the mass ratio of the medium for centrifugal separation and desulfurization to the heavy material is 1:2.35 to 1:5.1, and those skilled in the art can prepare the medium according to the density required by the experiment.
The separation density of centrifugal ore dressing and desulfurization is controlled to be 2.5-3.5g/cm 3 If the separation density of the centrifuge is reduced, the separation indexes of the concentrate and the sulfur concentrate are influenced, mainly because the sulfur mineral can be separated out through overflow of the cyclone under the condition of better dissociation of the sulfur mineral and other minerals under the condition of lower separation density, so that the yield of the sulfur concentrate is higher, the sulfur content in the sulfur concentrate is lower, and the yield of the concentrate is lower.
Generally, the constituents of the second concentrate include diaspore and silicate minerals; the composition of the second sulfur concentrate includes iron-titanium minerals.
S4, mixing the first concentrate and the second concentrate to obtain a product concentrate;
and S5, mixing the first sulfur concentrate and the second sulfur concentrate to obtain a product sulfur concentrate.
The method for treating sulfur-containing bauxite according to the present application will be described in detail below with reference to examples, comparative examples, and experimental data.
Example 1
A sulfur-containing bauxite. Wherein, the raw ore Al 2 O 3 The content of SiO is 60.76 percent 2 The sulfur content was 11.56% and the sulfur content was 5.72%, and a desulfurization test was conducted according to the treatment flow chart of a sulfur-containing bauxite treatment method shown in FIG. 1.
The method comprises the following specific steps: the raw ore is treated by a crushing-grading process to obtain a crushed product with the granularity of less than 10mm, the crushed product is graded by 3mm size fraction, and the-10 mm to +3mm size fraction is subjected to the preparation of heavy liquid with the density of 2.85g/cm by sodium silicate solution and magnetite 3 Under the condition, a dense medium cyclone is adopted for separation, the feeding pressure of the dense medium cyclone is 0.15MPa, and gravity concentrate 1 and gravity sulfur concentrate 1 are obtained; preparing a heavy liquid with the density of 3.0g/cm by using a sodium silicate solution and ferrosilicon powder in a grain size of-3 mm 3 Under the condition of (1), a centrifugal machine is adopted for separation to obtain centrifugal concentrate 2 and centrifugal sulfur concentrate 2; and combining the gravity concentrate 1 and the centrifugal concentrate 2 into a concentrate, and combining the gravity sulfur concentrate 1 and the centrifugal sulfur concentrate 2 into a sulfur concentrate.
Example 2
A sulfur-containing bauxite. Wherein, the raw ore Al 2 O 3 The content of SiO is 64.52 percent 2 The sulfur content was 10.41% and the sulfur content was 1.82%, and a desulfurization test was carried out according to the treatment flow chart of a sulfur-containing bauxite treatment method shown in FIG. 1.
The method comprises the following specific steps: crushing and grading the raw ore by a crushing-grading process to obtain a crushed product with the granularity of less than 10mm, grading the crushed product by a grade of 1mm, and preparing a heavy liquid with the density of 3.0g/cm in water and ferrosilicon in the grade of-10 mm to +1mm 3 Under the condition, a dense medium cyclone is adopted for separation, the feeding pressure of the dense medium cyclone is 0.20MPa, and gravity concentrate 1 and gravity sulfur concentrate 1 are obtained; preparing a heavy liquid with the density of 3.1g/cm by mixing a calcium chloride saturated solution and ferrosilicon powder in a-1 mm size fraction 3 Under the condition of (1), a centrifugal machine is adopted for separation to obtain centrifugal concentrate 2 and centrifugal sulfur concentrate 2; and combining the gravity concentrate 1 and the centrifugal concentrate 2 into a concentrate, and combining the gravity sulfur concentrate 1 and the centrifugal sulfur concentrate 2 into a sulfur concentrate.
Example 3
A sulfur-containing bauxite. WhereinCrude ore Al 2 O 3 66.72% of SiO 2 The sulfur content was 9.53% and the sulfur content was 0.85%, and the desulfurization test was carried out according to the process flow chart of the process for treating sulfur-containing bauxite shown in FIG. 1.
The method comprises the following specific steps: crushing and grading the raw ore by a crushing-grading process to obtain a crushed product with the granularity of less than 10mm, grading the crushed product by a size fraction of 0.074mm, and preparing a heavy liquid with the density of 3.3g/cm between-10 mm to +0.074mm in water and magnetite 3 Under the condition, a dense medium cyclone is adopted for separation, the feeding pressure of the dense medium cyclone is 0.10MPa, and gravity concentrate 1 and gravity sulfur concentrate 1 are obtained; preparing a heavy liquid with the density of 3.5g/cm by mixing a calcium chloride saturated solution and ferrosilicon powder in a grain size of-0.074 mm 3 Under the condition of (1), a centrifugal machine is adopted for separation to obtain centrifugal concentrate 2 and centrifugal sulfur concentrate 2; and combining the gravity concentrate 1 and the centrifugal concentrate 2 into concentrate, and combining the gravity sulfur concentrate 1 and the centrifugal sulfur concentrate 2 into sulfur concentrate.
Comparative example 1
Comparative example 1 one of the sulfur-containing bauxites of example 1 was used. Wherein, the raw ore Al 2 O 3 Content of 60.76%, SiO 2 The sulfur content was 11.56% and the sulfur content was 5.72%, and a desulfurization test was conducted according to the treatment flow chart of a sulfur-containing bauxite treatment method shown in FIG. 1.
The method comprises the following specific steps: the raw ore is treated by a crushing-grading process to obtain a crushed product with the granularity of less than 10mm, the crushed product is graded by 6mm size fraction, the-10 mm to +6mm size fraction is subjected to sodium silicate solution and magnetite to prepare heavy liquid with the density of 2.85g/cm 3 Under the condition, a dense medium cyclone is adopted for separation, the feeding pressure of the dense medium cyclone is 0.15MPa, and gravity concentrate 1 and gravity sulfur concentrate 1 are obtained; preparing a heavy liquid with the density of 3.0g/cm by mixing sodium silicate solution and ferrosilicon powder in the grade of-6 mm 3 Under the condition of (1), a centrifugal machine is adopted for separation to obtain centrifugal concentrate 2 and centrifugal sulfur concentrate 2; and combining the gravity concentrate 1 and the centrifugal concentrate 2 into concentrate, and combining the gravity sulfur concentrate 1 and the centrifugal sulfur concentrate 2 into sulfur concentrate.
Comparative example 2:
comparative example 2 one of the sulfur-containing bauxites of example 1 was used. Wherein, the raw ore Al 2 O 3 The content of SiO is 60.76 percent 2 The sulfur content was 11.56% and the sulfur content was 5.72%, and a desulfurization test was conducted according to the treatment flow chart of a sulfur-containing bauxite treatment method shown in FIG. 1.
The method comprises the following specific steps: the raw ore is treated by a crushing-grading process to obtain a crushed product with the granularity of less than 10mm, the crushed product is graded by 3mm size fraction, and the heavy liquid with the density of 2.45g/cm is prepared between sodium silicate solution and magnetite in-10 mm to +3mm size fraction 3 Under the condition, a dense medium cyclone is adopted for separation, the feeding pressure of the dense medium cyclone is 0.15MPa, and gravity concentrate 1 and gravity sulfur concentrate 1 are obtained; preparing heavy liquid with the density of 2.4g/cm by mixing sodium silicate solution and ferrosilicon powder in a grain size of-3 mm 3 Under the condition of (1), a centrifugal machine is adopted for separation to obtain centrifugal concentrate 2 and centrifugal sulfur concentrate 2; and combining the gravity concentrate 1 and the centrifugal concentrate 2 into a concentrate, and combining the gravity sulfur concentrate 1 and the centrifugal sulfur concentrate 2 into a sulfur concentrate.
Comparative example 3:
comparative example 3 the sulfur-containing bauxite of example 1 was used. Wherein, the raw ore Al 2 O 3 The content of SiO is 60.76 percent 2 The sulfur content was 11.56% and the sulfur content was 5.72%, and a desulfurization test was conducted according to the treatment flow chart of a sulfur-containing bauxite treatment method shown in FIG. 1.
The method comprises the following specific steps: the raw ore is treated by a crushing-grading process to obtain a crushed product with the granularity of less than 10mm, the crushed product is graded by 3mm size fraction, the-10 mm to +3mm size fraction is subjected to sodium silicate solution and magnetite to prepare heavy liquid with the density of 2.85g/cm 3 Under the condition, a dense medium cyclone is adopted for separation, the feeding pressure of the dense medium cyclone is 0.08MPa, and gravity concentrate 1 and gravity sulfur concentrate 1 are obtained; preparing a heavy liquid with the density of 3.0g/cm by using a sodium silicate solution and ferrosilicon powder in a grade of-3 mm 3 Under the condition of (1), a centrifugal machine is adopted for separation to obtain centrifugal concentrate 2 and centrifugal sulfur concentrate 2; and combining the gravity concentrate 1 and the centrifugal concentrate 2 into a concentrate, and combining the gravity sulfur concentrate 1 and the centrifugal sulfur concentrate 2 into a sulfur concentrate.
Examples of the experiments
Comparative analysis was performed on the products obtained in examples 1 to 3 and comparative examples 1 to 3, and the results are shown in the following table:
it can be known from the comparison of the data in the example 1 and the comparative example 1 that increasing the crushing granularity and increasing the granularity of the heavy medium cyclone and the centrifuge directly affect the sulfur content and the sulfur content in the final concentrate, mainly because the sulfur mineral in the sulfur-containing bauxite has a complex embedding relationship with other minerals and has a fine embedding granularity, under the condition of a coarse granularity, the mineral dissociation is insufficient, the sulfur content in the sulfur concentrate in the separation process is low, the sulfur content in the concentrate is high, and the separation effect is directly affected.
It can be known from the comparison of the data in the example 1 and the comparative example 2 that the separation density of the dense medium cyclone and the centrifuge is reduced, and the separation indexes of the concentrate and the sulfur concentrate are influenced, mainly because the sulfur mineral can be separated through overflow of the cyclone under the condition of better dissociation of the sulfur mineral and other minerals under the condition of lower separation density, so that the yield of the sulfur concentrate is higher, the sulfur content in the sulfur concentrate is lower, and the yield of the concentrate is lower.
As can be seen from the comparison of the data in the example 1 and the comparative example 3, the feeding pressure of the dense medium cyclone is reduced, and the separation index of the concentrate and the tailings is influenced, mainly because the feeding pressure is insufficient, the centrifugal force is low, and the separation of the sulfur minerals and other minerals cannot be well realized.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the method provided by the embodiment of the invention adopts the processes of crushing-grading, coarse-grained heavy-medium beneficiation desulfurization and fine-grained centrifugal beneficiation desulfurization to treat the sulfur-containing bauxite, so that sulfur concentrate with high sulfur content can be obtained, and aluminum concentrate with low sulfur content and higher recovery rate is obtained. The method can effectively improve the amount of usable bauxite in China, and has important social and economic benefits for the healthy and sustained development of the aluminum industry.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A process for treating sulfur-containing bauxite, the process comprising:
carrying out crushing and grading treatment on the sulfur-containing bauxite to obtain a coarse fraction material and a fine fraction material;
performing first desulfurization on the coarse fraction material to obtain a first concentrate and a first sulfur concentrate;
performing second desulfurization on the fine fraction material to obtain a second concentrate and a second sulfur concentrate;
wherein the first desulfurization is gravity separation desulfurization, and the second desulfurization is centrifugal ore dressing desulfurization.
2. The process for the treatment of sulfur-containing bauxite of claim 1, wherein the feed pressure for the gravity desulfurization is 0.1 to 0.5 MPa.
3. The process for the treatment of sulfur-containing bauxite of claim 1, wherein the gravity desulfurization has a classification density of 2.5-3.3g/cm 3 ；
The medium for gravity desulfurization comprises one of water, a saturated solution of calcium chloride and a solution of sodium silicate;
the heavy material for gravity desulfurization comprises at least one of magnetite and ferrosilicon;
the particle size of the magnetite and the ferrosilicon is less than 0.038 mm.
4. The method of treating sulfur-containing bauxite of claim 1, wherein the gravity desulfurization is carried out using a dense medium cyclone, which is a three-product dense medium cyclone.
5. The method for treating sulfur-containing bauxite of claim 1, wherein the separation density of the centrifugal beneficiation desulfurization is 2.5 to 3.5g/cm 3 ；
The medium for centrifugal ore dressing and desulfurization comprises one of water, a saturated solution of calcium chloride and a solution of sodium silicate;
the heavy material for centrifugal ore dressing and desulfurization comprises ferrosilicon;
the grain size of the ferrosilicon is less than 0.038 mm.
6. The method for treating sulfur-containing bauxite according to claim 1, characterized in that the equipment for centrifugal beneficiation and desulfurization is a water jacket type centrifuge.
7. The method of claim 1, wherein the coarse fraction has a particle size of n-10mm and the fine fraction has a particle size of 0-n mm, wherein n is a particle size boundary between the coarse and fine fractions, and wherein n is between 0.074 and 3.
8. The method of treating sulfur-containing bauxite of claim 1, wherein the sulfur content of the sulfur-containing bauxite is greater than 0.8% by mass.
9. The method of processing sulfur-containing bauxite according to claim 1, characterized in that the crushing and classifying equipment includes a jaw crusher and a pair of roll crushers, and the crushing and classifying equipment includes a classifier, a cyclone, a linear sieve and a high-frequency sieve.
10. The method of treating sulfur-containing bauxite of claim 1, wherein the constituents of the first concentrate include gibbsite and silicate minerals;
the composition of the second concentrate comprises diaspore and silicate minerals;
the composition of the first sulfur concentrate comprises an iron-titanium mineral;
the second sulfur concentrate has a composition comprising a ferro-titanium mineral.
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| CN105107618A (en) * | 2015-09-26 | 2015-12-02 | 李清湘 | Gravity separation method for sedimentary bauxite |
| CN110860367A (en) * | 2019-11-04 | 2020-03-06 | 湖南绿脉环保科技有限公司 | Gravity separation method for gibbsite type bauxite |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105107618A (en) * | 2015-09-26 | 2015-12-02 | 李清湘 | Gravity separation method for sedimentary bauxite |
| CN110860367A (en) * | 2019-11-04 | 2020-03-06 | 湖南绿脉环保科技有限公司 | Gravity separation method for gibbsite type bauxite |
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