CN101693217A - System and method for grinding bauxite by dry method - Google Patents
System and method for grinding bauxite by dry method Download PDFInfo
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- CN101693217A CN101693217A CN200910207103A CN200910207103A CN101693217A CN 101693217 A CN101693217 A CN 101693217A CN 200910207103 A CN200910207103 A CN 200910207103A CN 200910207103 A CN200910207103 A CN 200910207103A CN 101693217 A CN101693217 A CN 101693217A
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Abstract
The invention relates to a system and a method for grinding bauxite by a dry method, wherein the system comprises a vertical roller mill used for grinding bauxite material, the vertical roller mill is internally provided with a powder selecting device, the lower part thereof is provided with an air inlet, the upper part thereof is provided with a discharge hole, air entering from the air inlet forms ring-shaped air in the vertical roller mill and enters the powder selecting device by carrying ground mineral powder, and then the ring-shaped air is discharged from the discharge hole by carrying the qualified mineral powder; and the method comprises the following steps: bauxite material is fed into the vertical roller mill from a feed port to conduct dry-method grinding, ground mineral powder is carried by air entering from the air inlet at the lower part of the vertical roller mill and then enters the powder selecting device at the inner upper part of the vertical roller mill, after separation, the mineral powder with proper particle size enters a dust collecting device connected at the discharge hole at the upper part of the vertical roller mill through the discharge hole, and the dust collecting device collects the mineral powder. The invention simplifies the ore grinding grading process flow of the bauxite, leads operation and maintenance to be more convenient, and simultaneously greatly reduces the energy consumption of unit grinding product, and consumption of a grinding body, thus obtaining more uniform products.
Description
Technical field
The present invention relates to the grinding technique of bauxite, specifically, relate to a kind of system and method for dry grinding bauxite.
Background technology
The bauxite grinding is the important procedure of alumina producing, usually the bauxite that comes out from mining through thick broken, carefully be crushed to 15～20mm, send aluminium oxide factory to carry out raw ore slurry and prepare.China's bauxite belongs to diaspore type bauxite substantially, has mineralogy characteristics such as high alumina, high silicon, low iron, middle isogonic are hard, indissoluble, and no matter therefore domestic be that Bayer process, sintering process or mixed combining method are selected all to attach great importance to grinding process and equipment.
Through retrieval, patent about bauxite powder grinding process and equipment has at present: 96120493.1 " a kind of raw ore slurry preparation methods of producing aluminium oxide by bayer ", " 200510003164.0 a kind of grinding grading technique technology of alumina raw material bauxite ", 200510003163.6 " bauxite grinding technology and equipment " and 200710099825.3 " a kind of milling method that improves bauxite Milling product size distribution ".
By and large, the bauxite powder grinding process and the equipment of alumina producer use at present mainly contain two kinds:
1) one section ball mill is joined spiral classifier technology: this is the most popular technology of domestic and international alumina producer, this scheme began to use at home from the 1950's, the newly-built alumina producer of present domestic part still uses this technology, extend as Shandong aluminium second alumina producer, the newly-built flat alumina producer of stubble, the East Sea, South Mountain alumina producer etc.Its technical characterstic is: adopt one section ball mill to join spiral classifier and form the closed circuit grinding flow process, bauxite (ore deposit that has need be allocated a certain amount of lime into) together adds in one section ball mill with circulating mother liquor, the product that ore grinding obtains advances the spiral classifier classification, the coarse sand of classification returns grinding machine to be continued to grind, the screw classifying overflow is the product of this operation, is sent to the stripping operation subsequently.
2) two sections grinding-in hydrocyclone technologies: this technology also claims " one section open circuit, two sections closed circuit two stage grinding classification flow processs " on mineral dressing, early than being applied to Pingguo, Guangxi aluminium manufacturer the nineties in 20th century, aluminium is introduced the technology of French Pechiney Chinalco in the system, now newly-built at home aluminium oxide factory applies, as Shanxi Aluminium Plant 800kt/a expansion project, Yangquan, Shanxi, Henan newly pacify, alumina producer such as Sanmenxia Gorge, Henan, all adopt two sections grinding-in hydrocyclone technologies.The characteristics of this technology are: Grinding procedure is divided into two sections, roughly grind with rod mill for first section, bauxite is milled to 0.8～1mm from 13～25mm, carry out fine grinding with second section ball mill, levigate extremely-63 μ m account for 70%～80% with bauxite, corase grind and the middle ore pulp that obtains of fine grinding are together intake and are carried out classification in the power cyclone, and classification underflow returns the interior circulation ore grinding of second section ball mill, and the classification overflow is as the qualified products of this operation.
More than two kinds of grinding process common characteristic be to adopt wet method closed cycle operation, grinding attachment mainly is a ball mill, grinding medium into powder is steel ball and rod iron, grader adopts spiral classifier or hydrocyclone.On the uniformity of the advance of technology and product granularity, two sections grinding-in cyclone classification technologies are advanced than one section mill, and production capacity is big, especially is fit to difficult ore grinding stone.But two kinds of common shortcomings that exist of technology are that disposable grinding efficiency is low, and internal circulating load is big, serious wear, and energy consumption and abrasive body consumption are big.
Therefore, be necessary to provide that a kind of flow process is simple, grinding efficiency is high, the bauxite grinding technique that energy consumption is low.
Summary of the invention
The objective of the invention is to propose a kind of system and method for novel dry grinding bauxite.
Those skilled in the art think that the dust of wet grinding is little, and be exactly the stripping operation subsequently, the powder that grinds can carry out stripping with the slip form to be handled, therefore wet grinding is more suitable for being used for grinding bauxite, but because traditional ball mill grinding efficiency is low, and the consumption of abrasive body is very big, so energy consumption and cost are all very high.
Therefore, the inventor at first adopts dry method to carry out the grinding of bauxite, and adopts the current vertical roller grinder ripe, that mill efficiency is the highest of using.
The applicability key of vertical roller grinder grinding material is the grindability and the abrasion of material, because abrasion has determined the service life of mill and grinding roller cover, usually all there is the regulation of oneself in vertical roller grinder producer, for example the MPS mill allows abrasion loss to be≤4g/t, and F.L.Smith's regulation allows abrasion loss to be≤10g/t.China's various places bauxite formation condition difference, the hardness of ore and grindability difference are bigger, and be the finest and close with Guangxi bauxite, and the most awkward mill is softer with Shanxi bauxite quality, the most easily grinds, and Guizhou and Henan bauxite are placed in the middle.By vertical roller grinder grindability and abrasion test, the inventor thinks, Bond work index≤13kwh, the bauxite of abrasion≤10g/t all are fit to carry out grinding with vertical roller grinder, and the consumable accessory life-span can reach 8000h.In fact, the vertical roller grinder high-abrasive material is constantly progressive in recent years, and vertical roller grinder is successfully applied to the grinding of hard difficult-to-grind materials at cement industry, and for example the grinding of grog and blast-furnace cinder has also been proved vertical roller grinder the bauxite grinding is adapted to fully.
In addition, vertical roller grinder is also very wide to material moisture adaptability, and according to the application practice of vertical roller grinder in some nonmetallic ore fields, initial moisture≤5% vertical roller grinder can not mixed hot blast, and is little to mill efficiency and classification influence.Common bauxite moisture, the north≤5%, south≤8%, the moisture allowance is little.If in fact lime is with the bauxite grinding, clearing up of lime can absorption portion moisture, and for example to go out to allocate into the lime ratio be 8% to 1 ton of dried bauxite, and lime contains calcium oxide 85%, and lime digestion can absorb moisture 21.86kg.Therefore when bauxite moisture≤7%, vertical roller grinder does not need to mix hot blast, will mix the part hot blast above behind 7% moisture.To alumina producer, hot air source has two, and the one, extract the part high-temperature flue gas from steam power plant, the 2nd, utilize baking furnace fume, preferably these two kinds of thermals source.
The system of dry grinding bauxite of the present invention comprises the vertical roller grinder that is used for the grinding bauxite raw material.
The top of described vertical roller grinder comprises built-in powder selection device, is used for the bauxite breeze after sorting is ground; Generally, all be provided with powder selection device in the vertical roller grinder.
The bottom of described vertical roller grinder has air inlet, and top has discharging opening, and the wind that air inlet enters forms annular wind in vertical roller grinder, and the breeze that carries after the grinding enters powder selection device, and annular then wind carries qualified breeze and discharges from discharging opening.
Described vertical roller grinder also comprises charging aperture, is used for bauxitic feed materials is introduced vertical roller grinder.
Described system also comprises dust arrester installation, is connected the discharging opening of described vertical roller grinder, is used to collect breeze.
Described system also comprises blower fan I, is connected the air inlet of the bottom of described vertical roller grinder, is used for air blast in vertical roller grinder.
Described system also comprises blower fan II, is used to collect the wind after dust arrester installation is collected breeze, and it is circulated to the air inlet of vertical roller grinder.
The breeze that dust arrester installation is collected enters the stripping operation with after the circulating mother liquor of stripping operation mixes.
Bauxite Ginding process of the present invention comprises: adopt vertical roller grinder, bauxitic feed materials is carried out dry grinding from charging aperture feeding vertical roller grinder, grinding the back breeze is taken up by the wind that the air inlet of vertical roller grinder bottom enters, enter the powder selection device of vertical roller grinder internal upper part, after sorting, the breeze of suitable particle size enters the dust arrester installation that is connected the vertical roller grinder upper part discharge port through discharging opening with the wind, and dust arrester installation is collected breeze.
The granularity of breeze can be produced needs to satisfy by rotating speed, the blower fan 1 air quantity flexible modulation of powder selection device fully, and Bayer process factory breeze granularity is controlled at-63 μ m and accounts for 70%～80% at present, and-315 μ m reach 100%.
The granularity of bauxitic feed materials can be below the 150mm, the bauxitic feed materials of preferred 25-60mm.
The underproof breeze of granularity continues to grind in vertical roller grinder.
Described method also comprises the air inlet that the annular wind after collecting breeze through dust arrester installation is recycled to the vertical roller grinder bottom.
Described bellows chamber is drawn together the cold wind that bleeds in the hot blast that blasted by blower fan I and vertical roller grinder bottom, and when the moisture of bauxitic feed materials≤7%, vertical roller grinder does not need to mix hot blast; When the moisture of bauxitic feed materials＞7%, vertical roller grinder need mix hot blast.
Described hot blast can adopt various industrial waste gases, concerning alumina producer, and preferred high-temperature flue gas or the aluminum oxide roasting furnace flue gas that extracts from steam power plant.
Can also comprise quick lime in the described bauxitic feed materials, the addition of quick lime is 5～10%, preferred 8%.
Bauxite and lime feed in the vertical roller grinder in proportion and grind, and bauxite powder that granularity is qualified and circulating mother liquor are deployed into the raw ore slurry of certain solid content in surge-tank, enter the alumina producing subsequent handling.The product granularity that vertical roller grinder grinds is even, regulates flexibly, can well satisfy the requirement of high pressure stripping and sedimentation operation.
The present invention introduces alumina industry with the state-of-the-art vertical roller grinder of cement industry, thereby simplify the grinding grading technique flow process, make Operation and Maintenance convenient, reduce the energy consumption and the abrasive body consumption of unit ore milling product simultaneously significantly, obtain more uniform ore milling product.
Grind the practice of cement slurry from vertical roller grinder, vertical roller grinder replaces traditional ball mill and has following advantage:
1) mill efficiency height.Vertical mill adopts material bed extruding pulverization principle grinding material, the grinding mode is reasonable, and air-flow can in time be taken levigate material out of in the mill, avoided the grinding phenomenon, so mill efficiency height, oil consumption are low, grinding pow consumption is 50%～60% of a ball mill only, and the power consumption of whole system is 75%～90% of a ball mill system, raw material moisture is big more, and system's power consumption is saved many more.
2) mill feed material size is big.Mill feed size can reach 5% of grinding roller diameter, and the large-scale abrasive particle Du Keda 100～150mm that is grinding into can save two-stage crushing, reduces investment outlay.
3) drying capacity is strong.Go into to grind hot blast and enter from circumferential weld, more than the wind scooter 80m/s, the mill inner ventilation area is big, and resistance is little, and draught capacity is strong, the drying efficiency height.Utilize low temperature waste gas can dry the material of 6%～8% moisture, can dry the material of 15%～20% moisture as adopting the hot-blast stove heat supply.
4) control is convenient.Material time of staying in mill is short, is 2～4 minutes, and ball milling is then wanted 15～20 minutes, so it is fast to produce conditioned reaction, is easy to raw ingredients and fineness regulated and controls, thereby the chemical composition of product and granularity fluctuates for a short time, also is convenient to realize operation automation.
5) technological process is simple, apparatus arrangement is compact, and floor space is 50%～70% of a milling system, and it is little to take up room.And can arrange in the open, invest low.
6) noise is low, airborne dust is few.Clean operation environment is effectively in environmental protection.
7) abrasion are little, the utilization rate height.When vertical abrasive dust ground cement slurry, wear-out part consumption was generally 5～10g/t, and roller shell and mill liner plate life-span can reach more than the 8000h, and operation rate can reach more than 90%.
8) cost is low.Producing 800000 tons of producing aluminium oxide by bayer factories per year for one adopts vertical roller grinder to replace the measuring and calculating of two sections mill benefits:
Configuration one: 2 of homemade vertical roller grinders, output 300t/h;
Dispose two: two sections mills, respectively 1 of every group of ￠ 3.2 * 4.5m rod milling, ￠ 3.6 * 8.5m ball milling, 750m3/h line pump, hydrocyclone need three groups, open 2 groups and are equipped with 1 group, output 300t/h.
Relatively: (calculate with dried ore deposit per ton, roller mill expense provides with reference to the cement plant)
| Item compared | Vertical roller grinder | Two sections mills | Remarks | |
| ??1 | Equipment purchasing expense (ten thousand yuan) | ??2200 | ??2000 | |
| ??2 | Civil engineering and mounting cost (ten thousand yuan) | ??400 | ??900 | |
| ??3 | Installed power (kw) | ??4400 | ??7890 | |
| ??4 | Power consumption (kwh) | ??13 | ??15 | |
| ??5 | Maintenance cost (unit) | ??3 | ??10 |
According to last table data, in the practical condition in conjunction with existing technology, can predict and adopt vertical roller grinder that a ton aluminium oxide investment is descended 3.75 yuan/ton, 9 yuan/ton (amounting to 1 ton of aluminium oxide) of operating cost decline in 2 tons of dried ore deposits, obviously, the conventional two sections mills of vertical roller grinder economic benefit are very obvious.
Description of drawings
Fig. 1 is the schematic diagram of the vertical roller grinder dry grinding bauxite system of embodiment 1; Among the figure: 1, feed bin 1; 2, feed bin 2; 3, constant feeder under the storehouse; 4, belt conveyer; 5, vertical roller grinder; 6, blower fan I; 7, rotoclone collector; 8, blower fan II; 9, bagroom; 10, emptying blower fan; 11, conveying worm; 12, slurry blending groove; 13, delivery pump.
The specific embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Get typical sample earlier and do grindability and abrasion test, determine the vertical roller grinder type selecting.The grindability test is carried out according to building material industry standard " cement raw material grindability test method ", abrasion is tested each equipment producer also has some specific method according to own equipment characteristic, and principle is grinding part material test mill and a grinding roller metal loss quantitative determination abrasion under the equal conditions.The test and the type selecting report of below entrusting Shenyang heavy-duty machinery design and research institute that bauxite is done:
Material is formed: bauxite 90%
Particle size: 0～8mm
Result of the test:
The output of milling: tail over 20% o'clock 380kg/h at 0.063mm
0.315mm tailing over 100% passes through
Specific power consumption: 11.7kWh/t
Unit wear: 8.8g/t
Vertical Mill type selecting: (is example to produce 400000 tons of aluminium oxide factories per year)
Selected Vertical Mill model MLS3626
Yield index 180t/h
Indicator of power consumption 12.6kWh/t
8000 hours consumable accessory life-spans
Vertical roller grinder is selected MLS3626 vertical roller grinder (heavy smelting ore deposit, Shenyang Harmann Berstorff, Maschinenbau GmbH); Its inner top is provided with the powder selection device of grader as the sorting breeze; Dust arrester installation is the secondary dust arrester installation, comprises cyclone dust collection machine and bag collection machine.Concrete configuration mode is seen shown in Figure 1.
Selecting granularity for use is 0～25mm bauxitic feed materials, adds 8% quick lime, and bauxite and lime are gone into 1 and 2 (feed bin 1 and feed bins 2) respectively, and behind 3 accurate dosings of constant feeder under the storehouse, control bauxite moisture is less than 5%.
Mix feeding vertical roller grinder 5 by belt conveyer 4 and carry out grinding, be negative pressure in the vertical roller grinder, provide by blower fan 8 and 10.Feed annular wind from charging aperture in the vertical roller grinder, the circulated air that hot blast, the cold wind that bleeds and the blower fan II 8 that the source of annular wind is transported by blower fan I 6 returns is formed, the fine powder that rises through annular wind carries out classification by mill internal upper part grader, coarse fodder continues to return grinding in the mill after the classification, the accept powder enters rotoclone collector 7 and bagroom 9 with the wind, after two-stage was gathered dust, gas was collected breeze by 10 emptyings of emptying blower fan.The breeze granularity that can realize :-63 μ m content 70～85% ,-315 μ m content 100%.
Qualified breeze is delivered to slurry blending groove 12 by conveying worm 11, cooperates with circulating mother liquor 12 kinds of surge-tanks and makes the raw ore slurry that solid content is 350～400g/l, and raw ore slurry is delivered to down road stripping operation by delivery pump 13 again.
Claims (10)
1. the system of a dry grinding bauxite comprises the vertical roller grinder that is used for the grinding bauxite raw material.
2. the system as claimed in claim 1 is characterized in that, the top of described vertical roller grinder comprises built-in powder selection device, is used for the bauxite breeze after sorting is ground.
3. system as claimed in claim 2, it is characterized in that, the bottom of described vertical roller grinder has air inlet, top has discharging opening, the wind that air inlet enters forms annular wind in vertical roller grinder, the breeze that carries after the grinding enters powder selection device, and annular then wind carries qualified breeze and discharges from discharging opening.
4. system as claimed in claim 3 is characterized in that described system also comprises dust arrester installation, is connected the discharging opening of described vertical roller grinder, is used to collect breeze.
5. as claim 1 or 4 described systems, it is characterized in that described system also comprises blower fan I, be connected the air inlet of the bottom of described vertical roller grinder, be used for air blast in vertical roller grinder.
6. as claim 1 or 5 described systems, it is characterized in that described system also comprises blower fan II, be used to collect the wind after dust arrester installation is collected breeze, and it is circulated to the air inlet of vertical roller grinder.
7. the method for a dry grinding bauxite, comprise: adopt vertical roller grinder, bauxitic feed materials is carried out dry grinding from charging aperture feeding vertical roller grinder, grinding the back breeze is taken up by the wind that the air inlet of vertical roller grinder bottom enters, enter the powder selection device of vertical roller grinder internal upper part, after sorting, the breeze of suitable particle size enters the dust arrester installation that is connected the vertical roller grinder upper part discharge port through discharging opening with the wind, and dust arrester installation is collected breeze.
8. method as claimed in claim 7 is characterized in that, described method also comprises the air inlet that the annular wind after collecting breeze through dust arrester installation is recycled to the vertical roller grinder bottom.
9. method as claimed in claim 7 is characterized in that, described bellows chamber is drawn together the cold wind that bleeds in the hot blast that blasted by blower fan I and vertical roller grinder bottom, and when the moisture of bauxitic feed materials≤7%, vertical roller grinder does not need to mix hot blast; When the moisture of bauxitic feed materials＞7%, vertical roller grinder need mix hot blast.
10. method as claimed in claim 7 is characterized in that, comprises also in the described bauxitic feed materials that quick lime, the addition of quick lime are 5～10%, preferred 8%.
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| CN200910207103A CN101693217A (en) | 2009-10-23 | 2009-10-23 | System and method for grinding bauxite by dry method |
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| CN200910207103A CN101693217A (en) | 2009-10-23 | 2009-10-23 | System and method for grinding bauxite by dry method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102784691A (en) * | 2011-05-15 | 2012-11-21 | 盐城吉达机械制造有限公司 | Open circuit final grinding technology |
| CN103127994A (en) * | 2011-12-05 | 2013-06-05 | 洛阳宇航重工机械有限公司 | Aluminum oxide encrustation block crushing production line device with multiple end product particle sizes |
| CN105126957A (en) * | 2015-10-09 | 2015-12-09 | 河南东大矿业股份有限公司 | Crushing-grinding method for bauxite waste slag high-pressure rolling-grinding |
| CN106000616A (en) * | 2016-06-30 | 2016-10-12 | 湖州丰盛新材料有限公司 | Hot air circulation type powder selecting device |
| CN106311435A (en) * | 2015-06-26 | 2017-01-11 | 沈阳铝镁设计研究院有限公司 | Novel bauxite comminuting process adopting vertical mill |
| CN107522212A (en) * | 2016-06-22 | 2017-12-29 | 沈阳铝镁设计研究院有限公司 | A kind of large arch dam raw ore slurry preparation method of alumina producing Bayer process |
| CN107983519A (en) * | 2017-11-29 | 2018-05-04 | 北京环磨科技有限公司 | A kind of roller-plate disintegrator circuit grinding |
| CN111495554A (en) * | 2020-04-26 | 2020-08-07 | 东北大学设计研究院（有限公司） | Intensive short-process bauxite grinding process system |
-
2009
- 2009-10-23 CN CN200910207103A patent/CN101693217A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102784691A (en) * | 2011-05-15 | 2012-11-21 | 盐城吉达机械制造有限公司 | Open circuit final grinding technology |
| CN103127994A (en) * | 2011-12-05 | 2013-06-05 | 洛阳宇航重工机械有限公司 | Aluminum oxide encrustation block crushing production line device with multiple end product particle sizes |
| CN106311435A (en) * | 2015-06-26 | 2017-01-11 | 沈阳铝镁设计研究院有限公司 | Novel bauxite comminuting process adopting vertical mill |
| CN105126957A (en) * | 2015-10-09 | 2015-12-09 | 河南东大矿业股份有限公司 | Crushing-grinding method for bauxite waste slag high-pressure rolling-grinding |
| CN105126957B (en) * | 2015-10-09 | 2017-10-03 | 河南东大科技股份有限公司 | A kind of broken mill method of bauxite waste residue high pressure roller mill |
| CN107522212A (en) * | 2016-06-22 | 2017-12-29 | 沈阳铝镁设计研究院有限公司 | A kind of large arch dam raw ore slurry preparation method of alumina producing Bayer process |
| CN106000616A (en) * | 2016-06-30 | 2016-10-12 | 湖州丰盛新材料有限公司 | Hot air circulation type powder selecting device |
| CN107983519A (en) * | 2017-11-29 | 2018-05-04 | 北京环磨科技有限公司 | A kind of roller-plate disintegrator circuit grinding |
| CN111495554A (en) * | 2020-04-26 | 2020-08-07 | 东北大学设计研究院（有限公司） | Intensive short-process bauxite grinding process system |
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Open date: 20100414 |