CN101851926B - Method for carrying out dry-method capacity expansion in mountainside wet-process red mud disposal site - Google Patents
Method for carrying out dry-method capacity expansion in mountainside wet-process red mud disposal site Download PDFInfo
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- CN101851926B CN101851926B CN201010206236.2A CN201010206236A CN101851926B CN 101851926 B CN101851926 B CN 101851926B CN 201010206236 A CN201010206236 A CN 201010206236A CN 101851926 B CN101851926 B CN 101851926B
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Abstract
The invention discloses a method for carrying out dry-method capacity expansion in a mountainside wet-process red mud disposal site. The method comprises the following steps of: (1) carrying out drainage solidification treatment on a wet drainage red mud layer near an original wet-process red mud disposal site preliminary-stage dam (1) with a sand pile (2); extending a released water chute (4) of the original wet-process red mud disposal site to a planning dry-method capacity expansion elevation along a mountain slope, wherein the lower section of the released water chute (4) is connected with a released water pipeline (11); building a flood intercepting trench (5) along a planning dry-method stockpiling boundary; building a red mud filter pressing workshop (6) at a position of the mountain slope, which is hither than the extended released water chute (4), arranging a plurality filter presses (7) adaptive with the quantity of the red mud in the workshop, and paving a red slurry pipeline (8) and a filtrate pipe (9) along the mountain slope; and building a chute (10) along the mountain slope by taking the red mud filter pressing workshop (6) as the starting point, and extending the chute to the top of the original wet-process red mud disposal site. By adopting the invention, the reservoir storage capacity of the original wet-process red mud disposal site is increased, and the investment is saved.
Description
Technical field
The present invention relates to a kind of method of carrying out dry capacity-increasing to being close to mountain type wet red mud storage yard, belong to the red mud pilling technical field in alumina producing.
Background technology
Red mud is the waste residue producing in alumina producing.Red mud Main Components is Si0
2, CaO, Fe
20
3, A1
20
3, Na
20, TiO
2, K
2o, in addition containing igloss composition and other non-ferrous metal of trace etc.In the situation that red mud can't utilize in a large number and must store up, mainly contain at present three kinds and store up technique.
It is that wet method is stored up technique that the first is stored up technique.It is comparatively traditional red mud pilling mode that wet method is stored up, red mud and attached liquid be take (3～4): 1 liquid-solid ratio (solid content is 20%～25% left and right) is delivered to red mud dump with centrifugal pump and pipeline by alumina producer, red mud slurry is entered in red mud reservoir by floss hole, it is separated that mud pellet in slurry is relied on power natural subsidence for support, and wet red mud storage yard adopts backwater tower to collect clarification attached liquid.The attached liquid of approximately 80% left and right can be recycled by return water system returning alumina factory.Wet method is stored up in technique, has two kinds of modes of building a dam.It is a kind of that to be middle aluminium subordinate Shandong branch company, Henan branch company, Company Shanxi Branch, Central Region branch company, Guizhou branch company etc. produce by combination method the mode that initial dam that the enterprise of alumina adopts adds multistage sub-dam, first with materials such as native stones, build the initial dam of certain altitude, then red mud from sintering process is emitted on to periphery, stockyard, Bayer process red mud is emitted on middle part, stockyard, after initial dam piles with, utilize the peculiar hydraulic self-solidifying of red mud from sintering process filling to construct the sub-dam of multistage red mud, continue upwards to store up red mud.The precondition of this mode of building a dam is will have the red mud from sintering process of sufficient amount as the dam material on sub-dam.The second is that the pure Bayer processes of use such as Shandong Wei Qiao alumina producer, Chiping alumina producer are produced the disposable dam mode of building of enterprise's employing of alumina with import gibbsite, with materials such as native stones, build the initial dam of certain altitude, then stack Bayer process red mud, because Bayer process red mud is stream plastic state under high-moisture condition, do not there is mechanical strength, therefore cannot construct Zi Ba, can only disposablely build earth and rockfill dam and store up, after initial dam piles with, discard and separately build stockyard.This land utilization efficiency of storing up mode is lower.
It is that semidry method is stored up technique that the second is stored up technique, and the minorities such as current domestic Jin Zhonglv Guangxi branch company, Guangxi Hua Yin Chinalco be take the pure Bayer process alumina producer that diaspore is raw material and adopted.The wastewater from red mud that semidry method is stored up technique is about 1/5 of wet method, its flow process is: repeatedly wash red mud slurry solid content by subsider separation in 30%～40% left and right, again through further dehydration, make solid content bring up to 55% left and right, red mud filter cake is through mechanical strong stirring, its power viscous number is down to below 10PaS by 100PaS left and right, with diaphragm pump, through pipeline, delivers to red mud dump.Red mud dump surface is generally without ponding, moisture in stockyard a part of (approximately 60%) because surface evaporation is lost.Another part enters attached liquid gathering system by bottom sandstone drainage blanket white-out.Red mud after tedding gradually drying and consolidating be mouldable state, mechanical index increases, and can construct sub-dam with dry red mud and continue upwards to store up after initial dam piles with, its shortcoming is the site that need to select airing area larger, floor space is larger.
The third stores up technique is that dry method is stored up technique.Filtering red mud, behind solid content 67% left and right, is stored up with automobile transportation filter cake to stockyard.At present domesticly only in annual capacities such as Kaili County, Guizhou alumina producer, Nanchuan of Chongqing alumina producer, Chongqing WuLong's alumina producers, be less than the small-sized Bayer process alumina producer that diaspore is raw material of take of 200,000 tons and adopt.Middle aluminium Zun Yi alumina producer of building also adopts this technique.It is minimum that dry method is stored up technique red mud water content, and through suitably thering is good mechanical strength after airing, after initial dam piles with, can construct sub-dam with dry red mud and continue upwards to store up, be the developing direction of red mud pilling technology.
The site of red mud dump, according to the natural conditions of alumina producer periphery landform and land resources situation, can roughly be divided into mountain valley-type, is close to mountain type, flat type three classes, and there is the different technique of storing up dissimilar site.So-called mountain valley-type, refers to the red mud dump of building a dam and forming at place, the mouth of a valley, mountain valley, the main Types of dam body engineering quantity compare little ， China red mud dump; What is called is close to mountain type, is the surrounded stockyard of building a dam near the mountain in underfooting, hillside, and red mud clarification of water condition and flood control condition are poor, and damming works amount is larger, generally more common in knob; So-called flat type, is the stockyard of building a dam and surrounding at mild landform periphery, and damming works amount is large, and heap height of dam degree is limited, is built in plains region more.
Traditional mountain type wet red mud storage yard that is close to, is being used to design elevation, because clarification distance and dry beach length can not meet technological requirement, generally need close storehouse and separately the newly-built red mud dump of addressing meet the lasting red mud discharge needs of alumina producer.Red mud dump floor space is up to tens of hectares and even hectare up to a hundred, along with the growth of population and land resources reduce day by day, seeks to meet that to store up the new site of red mud dump of technological requirement more and more difficult near ， plant area.Even if Li plant area finds new site in place far away, it is invested often up to more than one hundred million units, and operating cost is also more expensive.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of method of carrying out dry capacity-increasing transformation to being close to mountain type wet red mud storage yard is provided, by taking certain engineering measure, make full use of the soil that former wet method stockyard taken and the antiseepage of having built up, flood discharge facility, increase the storage capacity in original wet method stockyard, extend the service time in former stockyard, save great amount of investment and the operating cost of newly-built red mud dump.
The present invention is achieved in that
Near wet row's red mud layer to certain limit and the degree of depth former wet red mud storage yard initial dam carries out discharging consolidation processing with sand pile, and the stability calculation on the sub-dam that its process range and the degree of depth build according to plan is determined; The flood drainage chute of former wet red mud storage yard is extended to the dry capacity-increasing elevation of planning along hillside landform; Flood drainage chute hypomere is connected with the pipeline that drains off floodwaters; Along the dry method of planning, store up border and build a section Great Gulch.
Red mud filter pressing factory building is built in the position higher than the flood drainage chute after extending on hillside, some the filter presses that adapt with red mud amount of configuration in factory building, and lay red mud slurry carrier pipe and filtrate pipe along hillside landform;
Take red mud filter pressing factory building as starting point, along hillside, build chute, extend to the top of former wet red mud storage yard.
Chute adopts reinforced concrete structure.
More than build rear beginning dry method and stored up operation.Red mud slurry from plant area is sent into filter press by red mud slurry carrier pipe, and after press filtration, filtrate is sent plant area back to filtrate pipe and reused, and red mud filter cake is sent in stockyard by chute.
With bulldozer, red mud filter cake is transported on the ground after sand drain consolidation process, when reaching 0.5m, filter cake thickness carries out airing, airing is used compacting machinary grinding compacting when the optimum moisture content, then lays last layer filter cake and repeat above-mentioned technique, until sub-dam construction completes.
After sub-dam construction completes, by chute, sending into red mud filter cake in stockyard is transported near sub-dam with bulldozer, airing rolling operation is carried out in layering, direction to flood drainage chute advances gradually, red mud layer rises gradually, while piling with to sub-dam, then builds the sub-dam of upper level, repeat above-mentioned technique, until arrive, when the dry method of planning is stored up elevation, close storehouse.
Compare with newly-built red mud dump, the present invention makes full use of the former soil that type wet method stockyard, mountain taken and the flood discharge facility having built up of being close to, increase the storage capacity in original wet method stockyard, extend the service time in former stockyard, great amount of investment and the operating cost of saving newly-built red mud dump, can obtain larger economic benefit.
Accompanying drawing explanation
Fig. 1 is floor map of the present invention.
Fig. 2 is generalized section of the present invention, i.e. A-A sectional view in Fig. 1.
The specific embodiment
Embodiments of the invention: as shown in Figure 1, 2, be of the present inventionly close to the method that mountain type wet red mud storage yard carries out dry capacity-increasing, follow these steps to implement:
Near wet row's red mud layer to certain limit and the degree of depth former wet red mud storage yard initial dam 1 carries out discharging consolidation processing with sand pile 2, and the stability calculation on the sub-dam 3 that its process range and the degree of depth build according to plan is determined; The flood drainage chute of former wet red mud storage yard 4 is extended to the dry capacity-increasing elevation of planning along hillside landform; Along the dry method of planning, store up border and build a section Great Gulch 5.
According to former wet red mud storage yard orographic condition, in the position higher than the flood drainage chute 4 after extending on hillside, build red mud filter pressing factory building 6, some the filter presses 7 that adapt with red mud amount of configuration in factory building.Along hillside landform, lay red mud slurry carrier pipe 8 and filtrate pipe 9.
Take red mud filter pressing factory building 6 as starting point, along hillside, build several chutes 10, extend to the top of former wet red mud storage yard.Chute 10 adopts reinforced concrete structure.
More than build rear beginning dry method and stored up operation.Red mud slurry from plant area is sent into filter press 7 by red mud slurry carrier pipe 8, and after press filtration, filtrate is sent plant area back to filtrate pipe 8 and reused, and red mud filter cake is sent in stockyard by chute 10.
With bulldozer, red mud filter cake is transported on the ground after sand pile 2 discharging consolidations are processed, when reaching 0.5m, filter cake thickness carries out airing, airing is used compacting machinary grinding compacting when the optimum moisture content, then lays last layer filter cake and repeat above-mentioned technique, until sub-dam 3 has been constructed.
After sub-dam 3 has been constructed, by chute 10, sending into red mud filter cake in stockyard is transported near sub-dam 3 with bulldozer, airing rolling operation is carried out in layering, direction to flood drainage chute 4 advances gradually, red mud layer rises gradually, while piling with to sub-dam 3, then builds the sub-dam of upper level, repeat above-mentioned technique, until arrive, when the dry method of planning is stored up elevation, close storehouse.
During whole dry method red mud filter cake is stored up, in, flood drainage chute 4 and the drain off floodwaters pipeline 11 of a rainwater by after increasing is discharged into outside storehouse, and the domatic rainwater that dry method is banked up beyond district is discharged to downstream, reservoir area after cutting Great Gulch 5 collections.
Claims (2)
1. a method of carrying out dry capacity-increasing to being close to mountain type wet red mud storage yard, it is characterized in that: it comprises following process: near the wet row's red mud former wet red mud storage yard initial dam (1) for layer sand pile (2) carry out discharging consolidation processing, the flood drainage chute of former wet red mud storage yard (4) is extended to the dry capacity-increasing elevation of planning along hillside, flood drainage chute (4) hypomere is connected with the pipeline that drains off floodwaters (11); Along the dry method of planning, store up border and build a section Great Gulch (5); Red mud filter pressing factory building (6) is built in the position higher than the flood drainage chute (4) after extending on hillside, configuration filter press (7) in factory building, and along hillside, lay red mud slurry carrier pipe (8) and filtrate pipe (9); The red mud filter pressing factory building (6) of take is starting point, builds chute (10) along hillside, extends to the top of former wet red mud storage yard; Red mud slurry from plant area is sent into filter press (7) by red mud slurry carrier pipe (8), and after press filtration, filtrate is sent plant area back to filtrate pipe (9) and reused, and red mud filter cake is sent in stockyard by chute (10); With bulldozer, red mud filter cake is transported on the ground after sand pile (2) discharging consolidation is processed, when reaching 0.5m, filter cake thickness carries out airing, airing is used compacting machinary grinding compacting when the optimum moisture content, then lays last layer filter cake and repeat above-mentioned technique, until sub-dam (3) have been constructed; After sub-dam (3) has been constructed, by chute (10), sending into red mud filter cake in stockyard is transported near sub-dam (3) with bulldozer, airing rolling operation is carried out in layering, direction to flood drainage chute (4) advances gradually, red mud layer rises gradually, while piling with to sub-dam (3), then builds the sub-dam of upper level, repeat above-mentioned technique, until arrive, when the dry method of planning is stored up elevation, close storehouse.
2. method of carrying out dry capacity-increasing to being close to mountain type wet red mud storage yard according to claim 1, is characterized in that: chute (10) adopts reinforced concrete structure.
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|---|---|---|---|
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| CN102174815B (en) * | 2011-03-22 | 2012-07-18 | 四川电力设计咨询有限责任公司 | Method for constructing ash dam in dry ash yard |
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|---|---|---|---|---|
| SU1147819A1 (en) * | 1982-09-16 | 1985-03-30 | Государственный научно-исследовательский и проектный институт по обогащению руд цветных металлов "Казмеханобр" | Storage for tails |
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2010
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