CN100478077C - Mine milling method for improving particles size distribution of bauxite mine milling products - Google Patents
Mine milling method for improving particles size distribution of bauxite mine milling products Download PDFInfo
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- CN100478077C CN100478077C CNB2007100998253A CN200710099825A CN100478077C CN 100478077 C CN100478077 C CN 100478077C CN B2007100998253 A CNB2007100998253 A CN B2007100998253A CN 200710099825 A CN200710099825 A CN 200710099825A CN 100478077 C CN100478077 C CN 100478077C
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- 238000009826 distribution Methods 0.000 title claims abstract description 28
- 229910001570 bauxite Inorganic materials 0.000 title claims description 42
- 238000003801 milling Methods 0.000 title claims description 27
- 239000002245 particle Substances 0.000 title abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 104
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000047 product Substances 0.000 claims description 55
- 239000004576 sand Substances 0.000 claims description 23
- 239000007795 chemical reaction product Substances 0.000 claims description 10
- 238000013467 fragmentation Methods 0.000 claims description 5
- 238000006062 fragmentation reaction Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims 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
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 235000013339 cereals Nutrition 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 235000011868 grain product Nutrition 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 29
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 7
- 238000004131 Bayer process Methods 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- 229910001648 diaspore Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- 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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/0613—Pretreatment of the minerals, e.g. grinding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Environmental & Geological Engineering (AREA)
- Food Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to a grinding method to improve aluminum ore grinding particle distribution. It screens or separates the fine aluminum ore or paste, with thick particles or block ore for grinding. Using quick grinding, forced ore extraction and highly efficient leveling technique, it reduces the regrinding for acceptable grain product, reducing pelitization or overgrinding, especially fine level content, with -200 being 85%, reducing -400 content lower than 40%, significantly improving grain distribution of the grind ore and reduced grinding energy consumption.
Description
Technical field
The present invention relates to a kind of milling method that improves bauxite Milling product size distribution, be used for the production process that ore concentration of bauxite or aluminium oxide etc. contain grinding operation.
Background technology
The bauxite resource of China is mainly based on diaspore type bauxite, have high alumina, high silicon, in the characteristics of low alumina silica ratio.For diaspore type bauxite, the industrial in recent years low Bayer process of production cost that adopt are produced aluminium oxide more.Yet, fast development along with aluminum oxide industry, the high-grade bauxite resource that is applicable to alumina producing Bayer process is fewer and feweri, in order to utilize China's middle-low bauxite resource economically, improve the grade of bauxite by ore dressing and desiliconizing, and then adopt economic Bayer process to carry out alumina producing, the sustainable development for realizing China's aluminium industry has great economic and social benefit.
No matter be ore concentration of bauxite or process for making alumina, all need the bauxite tcrude ore of different grades is carried out fragmentation and fine grinding, make it satisfy the requirement of technology.The granularity that ore concentration of bauxite requires is generally below the 0.3mm, and requirement simultaneously can not have too many subparticle, otherwise influences the process economics technical indicator, and follow-up smart mine tailing sedimentation filtration, Bayer process stripping, red-mud settlement etc. are all had seriously influences.Also often require in the bayer process in the raw material-0.246mm accounts for more than 99%, and same requirement can not have too many particulate, otherwise will be difficult to use in alumina producing.
A large amount of practical studies show, in the bauxite mineral composition owing to the aluminum silicon mineral nonhomogeneous hardness reasons such as big and gangue mineral physicochemical properties are close, the control ratio of ore grinding product granularity is difficulty, granularity control too slightly can't make the diaspore monomer be dissociated, or cause influence to stripping, granularity control too carefully can cause ore grinding product argillization and overground again, sedimentation filtration difficulties such as concentrate, mine tailing, red mud.The general draw ratio of grinding attachment that present stage adopts both at home and abroad is bigger, and material is output fast, not too is applicable to the bauxite Milling that hardness is lower, easily causes overground.In the size distribution of ore grinding product, micro-size fraction content is quite big, and the high slightly difficult mill of diaspore of hardness, so present the polarization of coarse grain particulate, middle grade product is less relatively, these all will affect greatly the production technology that ore concentration of bauxite and aluminium oxide etc. contains grinding operation, and also lack the research of this respect at present both at home and abroad.
Summary of the invention
The objective of the invention is deficiency at above-mentioned prior art existence, provide a kind of size distribution that can effectively overcome present bauxite Milling product inhomogeneous, subparticle is too much, influence the deficiency that aspects such as sorting index and subsequent technique exist, effectively improve technic index, reduce production costs and the milling method that can significantly improve bauxite Milling product size distribution of energy consumption.
The objective of the invention is to be achieved through the following technical solutions.
A kind of milling method that improves bauxite Milling product size distribution is after the bauxite fragmentation, earlier through prescreening or washup operation; The coarse fraction product or the lump ore that obtain are directly entered grinding machine, and the ore discharge of grinding machine also carries out classification again with the fine mixing that pre-classification or washup obtain; It is characterized in that treating after the bauxite fragmentation grind in the bauxite-the 3mm grain size content is greater than 10% o'clock, prescreening or washup operation are set before ore grinding, adopt short type grinding machine that coarse fodder or lump ore are carried out ore grinding then, grinding machine ore discharge and undersize material merging carrying out classification, sand return is through the closed circuit ore grinding that returns, the fine fraction product that overflow obtains can carry out two sections classifications according to the needs of technique of preparing, and sand return is through the closed circuit secondary grinding that returns, and the classification overflow is as the ore grinding end product.
A kind of milling method that improves bauxite Milling product size distribution of the present invention, the prescreening operation can be adopted dry screening or wet sieving, and compass screen surface can be the punching compass screen surface on rod compass screen surface or the steel plate, and screen size is 0.3～30mm.
A kind of milling method that improves bauxite Milling product size distribution of the present invention, by the thickness particle in the separation of the washup operation in advance bauxite, the equipment of washup operation is that drum washer, cylinder are sieved and washed machine or screw washer, the fine fraction product that obtains after the washup is through after concentrating, underflow or sand setting enter graded operation, and overflow is returned by pump and acted on the washup operation.
A kind of milling method that improves bauxite Milling product size distribution of the present invention, the grinding machine that ore grinding adopts is that draw ratio is not more than 1.5 lattice type, overflow type or diagrid type grinding machine, its best draw ratio is 0.5～0.9.
A kind of milling method that improves bauxite Milling product size distribution of the present invention, ore grinding and graded operation can adopt one section or secondary grinding technology; When the hardness of bauxite is hanged down easy mill, adopt one section closed circuit grinding technology.
A kind of milling method that improves bauxite Milling product size distribution of the present invention, when grading plant adopts spiral classifier, one group of spray water system with certain pressure is installed in the grader upper end, be used to wash the sand return of grader, thus reduce sand return to particulate be mingled with grinding machine to the regrinding of particulate, overground effect.
Method of the present invention; adopt one section or two stage grinding technology; to contain certain fine-graded bauxite or its ore pulp earlier through prescreening or classification; coarse grain or lump ore adopt the less short type grinding machine of draw ratio to carry out ore grinding; adopt quick ore grinding; force ore removal and classification technique efficiently; reduced regrinding of release mesh product; reduce the argillization of bauxite in grinding process and overground; especially reduce fine-graded content; accounted for 85% o'clock at ore grinding product-200 order;-400 order grain size contents are reduced to below 40%, thereby significantly improve the size distribution of bauxite Milling product and reduce power consume.
Description of drawings
Accompanying drawing 1 is the primary grinding process chart of the inventive method.
Raw ore passes through earlier prescreening, and the coarse fraction product on the sieve directly enters grinding machine, and the ore discharge of grinding machine mixes also with undersized product Carry out together classification, sand return is through the closed circuit ore grinding that returns, and the fine fraction that overflow obtains is as the ore grinding end product.
Accompanying drawing 2 is the secondary grinding process chart of the inventive method.
Raw ore passes through earlier prescreening, and the coarse fraction product on the sieve directly enters grinding machine, and the ore discharge of grinding machine mixes also with undersized product Carry out together classification, sand return is through the closed circuit primary grinding that returns, and the fine fraction product that overflow obtains carries out two sections classifications, sand return warp Cross the closed circuit secondary grinding that returns, the overflow of two sections classifications is as the ore grinding end product.
Accompanying drawing 3 is the secondary grinding process chart of the inventive method.
Raw ore passes through earlier washup or wet screening, and the coarse grain that obtains or lump ore directly enter grinding machine, and the fine fraction product that obtains is through concentrating After, overflow is returned by pump and is acted on the washup operation, and underflow or sand setting also carry out classification with the ore discharge product mixing of grinding machine, Sand return is through the closed circuit primary grinding that returns, and the fine fraction product that overflow obtains carries out two sections classifications, and sand return is returned two sections through closed circuit Ore grinding, the overflow of two sections classifications is as the ore grinding end product.
The specific embodiment
A kind of method of improving bauxite Milling product size distribution comprises prescreening, ore grinding and graded operation; When wait to grind in the bauxite-the 3mm grain size content is greater than 10% the time, prescreening or washup operation are set before ore grinding, adopt short type grinding machine that coarse fodder or lump ore are carried out ore grinding then, grinding machine ore discharge and undersize material merging carrying out classification, sand return is through the closed circuit ore grinding that returns, the fine fraction product that overflow obtains can carry out two sections classifications according to the needs of technique of preparing, and sand return is through the closed circuit secondary grinding that returns, and the classification overflow is as the ore grinding end product.The prescreening operation is to adopt dry screening or wet sieving, and compass screen surface can be the punching compass screen surface on rod compass screen surface or the steel plate, and screen size is 0.3～30mm.By the thickness particle in the separation of the washup operation in advance bauxite, the washup operation is to adopt drum washer, cylinder to sieve and wash equipment such as machine, screw washer, the fine fraction product that obtains after the washup is through after concentrating, underflow or sand setting enter graded operation, and overflow is returned by pump and acted on the washup operation.The grinding machine that ore grinding adopts is that draw ratio is not more than 1.5 lattice type, overflow type or diagrid type grinding machine, and its best draw ratio is 0.5～0.9.Ore grinding and graded operation can adopt one section or secondary grinding technology, when the hardness of bauxite is hanged down easy mill, can only adopt one section closed circuit grinding technology.When grading plant adopted spiral classifier, one group of spray water system with certain pressure was installed in the grader upper end, the sand return that is used to wash grader, thereby reduce sand return to particulate be mingled with grinding machine to the regrinding of particulate, overground effect.A kind of method of improving bauxite Milling product size distribution, be to contain certain powder or fine-graded bauxite breakdown products, earlier through prescreening or washup operation, the coarse fraction product or the lump ore that obtain directly enter grinding machine, and the fine that the ore discharge of grinding machine obtains with pre-classification or washup mixes also realizes classification.Needs according to technique of preparing (fineness, concentration, particle size distribution characteristics etc.), can increase by second section grinding process, the overflow product that classification is come out to primary grinding carries out two sections pre-classifications, beneficiating condition is as required determined the grading technology parameter, the coarse fraction sand return enters second section grinding process, and the overflow of two sections classifications is as the ore grinding end product.
The present invention is further illustrated below in conjunction with example.
Embodiment 1
The comprehensive sample ore 1 in Henan bauxite district, raw ore Al
2O
356.79%, SiO
214.90%, alumina silica ratio is 3.81, and the principle process chart of employing is seen Fig. 1, and the original ore size composition sees Table 1, and its concrete technology is as follows:
With comprehensive sample ore 1 is that the vibratory sieve of 15mm carries out dry screening with the aperture, it is 0.8 short type grinding machine that+15mm grade product enters draw ratio, grinding machine ore discharge product adopts spiral classifier to carry out classification with-15mm grade product, sand return is returned grinding machine and is regrinded under the effect of spiral classifier top shower water, classifier overflow is as the ore grinding end product, effluent concentration is 45～55%, and overflow fineness-0.074mm accounts for 75～85%.In the ore grinding product in the granularmetric composition :+0.147mm accounts for 0～5%, and-0.147+0.074mm accounts for 20～30%, and-0.074+0.037mm accounts for 30～40%, and-0.037mm accounts for 30～40%, and the size distribution of a certain after measured ore grinding product sampling result is as shown in table 2.
The comprehensive sample ore 1 original ore size distribution of table 1 (%)
The comprehensive sample ore 1 ore grinding product size distribution (%) of table 2
Embodiment 2
The comprehensive sample ore 2 in Henan bauxite district, Al
2O
353.71%, SiO
218.44%, alumina silica ratio is 2.91, and the principle process chart of employing is seen Fig. 2, and the original ore size composition sees Table 3, and its concrete technology is as follows:
With comprehensive sample ore 2 is that the vibratory sieve of 10mm carries out dry screening with the aperture, it is 0.6 short type grinding machine that+10mm grade product enters draw ratio, grinding machine ore discharge product adopts hydrocyclone to carry out classification with-10mm grade product, classification underflow is through the closed circuit primary grinding that returns, two sections classifications are carried out in the classification overflow, one section effluent concentration is 40～55%, overflow fineness-0.074mm accounts for 65～75%, two sections classification underflows are through the closed circuit secondary grinding that returns, the overflow of two sections classifications is as the ore grinding end product, two sections effluent concentrations are 35～45%, and overflow fineness-0.074mm accounts for 75～85%.In the ore grinding product in the granularmetric composition :+0.147mm accounts for 0～5%, and-0.147+0.074mm accounts for 10～20%, and-0.074+0.037mm accounts for 35～45%, and-0.037mm accounts for 35～45%, and the size distribution of a certain after measured ore grinding product sampling result is as shown in table 4.
The comprehensive sample ore 2 original ore sizes distributions of table 3 (%)
The comprehensive sample ore 2 ore grinding product size distribution (%) of table 4
Embodiment 3
The comprehensive sample ore 3 in Henan bauxite district, Al
2O
354.82%, SiO
217.62%, alumina silica ratio is 3.11, and the principle process chart of employing is seen Fig. 2, and the original ore size composition sees Table 5, and its concrete technology is as follows:
Comprehensive sample ore 2 usefulness drum washers are carried out the washup operation earlier; coarse grain that obtains or lump ore directly enter grinding machine; the fine fraction product that obtains is through after concentrating; overflow is returned by pump and is acted on the washup operation; underflow or sand setting also carry out classification with the ore discharge product mixing of grinding machine; sand return is through the closed circuit primary grinding that returns; the fine fraction product that overflow obtains carries out two sections classifications; one section effluent concentration is 45～60%; overflow fineness-0.074mm accounts for 65～75%; sand return is through the closed circuit secondary grinding that returns, and the overflow of two sections classifications is as the ore grinding end product.Two sections effluent concentrations are 35～45%, and overflow fineness-0.074mm accounts for 75～90%.In the ore grinding product in the granularmetric composition :+0.147mm accounts for 0～5%, and-0.147+0.074mm accounts for 10～20%, and-0.074+0.037mm accounts for 40～50%, and-0.037mm accounts for 35～45%, and the size distribution of a certain after measured ore grinding product sampling result is as shown in table 6.
The comprehensive sample ore 3 original ore sizes distributions of table 5 (%)
The comprehensive sample ore 3 ore grinding product size distribution (%) of table 6
Claims (1)
1, a kind of milling method that improves bauxite Milling product size distribution is after the bauxite fragmentation, earlier through prescreening or washup operation; The coarse fraction product or the lump ore that obtain are directly entered grinding machine, and the ore discharge of grinding machine also carries out classification again with the fine mixing that pre-classification or washup obtain; It is characterized in that treating after the bauxite fragmentation grind in the bauxite-the 3mm grain size content is greater than 10% o'clock, prescreening or washup operation are set before ore grinding, adopt short type grinding machine that coarse fodder or lump ore are carried out ore grinding then, grinding machine ore discharge and undersize material merging carrying out classification, sand return is through the closed circuit ore grinding that returns, the fine fraction product that overflow obtains carries out two sections classifications according to the needs of technique of preparing, and sand return is through the closed circuit secondary grinding that returns, and the classification overflow is as the ore grinding end product.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100998253A CN100478077C (en) | 2007-05-31 | 2007-05-31 | Mine milling method for improving particles size distribution of bauxite mine milling products |
| PCT/CN2007/003719 WO2008144979A1 (en) | 2007-05-31 | 2007-12-21 | A grinding method for improving particle size distribution of ground bauxite product |
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| CNB2007100998253A CN100478077C (en) | 2007-05-31 | 2007-05-31 | Mine milling method for improving particles size distribution of bauxite mine milling products |
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| CN100478077C true CN100478077C (en) | 2009-04-15 |
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| WO2008144979A1 (en) | 2008-12-04 |
| CN101058082A (en) | 2007-10-24 |
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