CN202988763U - Separation and washing device for coal ash silicon-calcium slag - Google Patents
Separation and washing device for coal ash silicon-calcium slag Download PDFInfo
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- CN202988763U CN202988763U CN2012205793896U CN201220579389U CN202988763U CN 202988763 U CN202988763 U CN 202988763U CN 2012205793896 U CN2012205793896 U CN 2012205793896U CN 201220579389 U CN201220579389 U CN 201220579389U CN 202988763 U CN202988763 U CN 202988763U
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- washing
- flyash
- calcium silicate
- filter
- silicate slag
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Abstract
The utility model provides a separation and washing device for coal ash silicon-calcium slag. The separation and washing device comprises a rubber belt type filter, a filtrate receiver, a washing liquid tank and a filter cake collecting tank. A filtering region and a washing region are placed on the rubber belt type filter in sequence along the forward direction of filter cloth. A filtrate outlet corresponding to the filtering region is communicated with the filtrate receiver, and a filtrate outlet corresponding to the washing region is communicated with the washing liquid tank. A spraying device capable of spraying washing liquid on the washing region is placed near the washing region. The filter cake collecting tank is placed at the back end of the washing region and used for collecting filter cakes formed in the washing region. According to the separation and washing device for the coal ash silicon-calcium slag, fast separation of the coal ash silicon-calcium slag and aluminiferous coarse liquor in dissolved thick liquid of the coal ash silicon-calcium slag is achieved, loss of secondary reaction in the process of dissolving and separating coal ash clinker is reduced, and alumina dissolution rate is improved.
Description
Technical field
The utility model relates to the flyash comprehensive treatment technique, relates in particular to a kind of flyash-calcium silicate slag and separates and washing plant.
Background technology
In flyash, alumina content is generally 17%-35%, and some areas region-by-region even can be more up to 40%-60%.Along with national environmental protection policy increasingly stringent and higher-grade bauxite resource shortage crisis aggravation, the technological method that extracts aluminum oxide from aluminous fly-ash had become the focus of research in recent years in recent years.The method of extracting aluminum oxide in existing aluminous fly-ash is mainly with the alumina leaching in aluminous fly-ash, and then the thick liquid of aluminum oxide with stripping separates with the flyash-calcium silicate slag.Improve the alumina recovery rate and can set about from digesting efficiency of alumina on the one hand, as extracting in the production method of aluminum oxide at flyash, the method that " pre-desiliconizing-sintering process " produces aluminum oxide puts into production; Can separate with the flyash-calcium silicate slag from the thick liquid of raising aluminum oxide on the other hand and set about.
Existing flyash-calcium silicate slag separates the main subsider that adopts and separates, and the patent that is CN101628725 as publication number discloses a kind of method and device by Fast Stripping aluminum oxide in the aluminous fly-ash sintered clinker.During this patent is open, realization Fast Stripping aluminum oxide from the aluminous fly-ash sintered clinker adopts " cylindrical digester+rod mill " two sections strippings, wherein adopt swirler+separation tank to separate one section stripping calcium silicate slag slurries, adopt revolving-leaf type filter to separate two sections stripping calcium silicate slag slurries.Turnover disc filter filtration process falls behind, and is eliminated gradually.Separation tank is to rely on the principle of gravity separation to realize liquid-solid separation, and thinner when solid particle size, perhaps between solid-liquid, difference in specific gravity hour, just is difficult to realize effectively settlement separate.As working as Al in stripping calcium silicate slag slurries
2O
3Concentration is during greater than 120g/l, and the heavy speed of flyash-calcium silicate slag will be very slow, settlement separately can't realize solid-liquid separation effectively.In addition, the liquid-solid disengaging time of this settlement separate technique is long, causes that the aluminum oxide secondary loss of reaction is high, calcium silicate slag aluminum oxide and the series of problems such as the sodium oxide solubility rate is low, washing times is many.
The utility model content
The purpose of this utility model is, can't timely and effectively separate for above-mentioned flyash stripping slurries, the problem that causes secondary reaction, proposing a kind of flyash-calcium silicate slag separates and washing plant, with realize flyash-calcium silicate slag in flyash stripping slurries and the sharp separation that contains the thick liquid of aluminium, reduce secondary reaction loss in flyash grog stripping sepn process, improve digesting efficiency of alumina.
for achieving the above object, the technical solution adopted in the utility model is: a kind of be used to realizing that the flyash-calcium silicate slag separates and washing plant, comprise rubber belt type filter, filtrate receiver, washing lotion groove and filter cake receiving tank, described rubber belt type filter is followed successively by filtrating area and washing section along the filter cloth working direction, the filtrate outlet that described filtrating area and washing section are corresponding is communicated with filtrate receiver and washing lotion groove respectively, and arrange near described washing section and can spray to washing section the sprinkling equipment of washing lotion, described filter cake receiving tank is for being positioned at the washing section rear end, be used for collecting the receiving tank that washing section forms filter cake.
Further, described equipment also comprises thermal insulator, and it is arranged at described filtrating area and/or washing section.
Further, described thermal insulator is provided with heat exchanging medium passage for can make the tunnel like stay-warm case of filter cloth from wherein passing through in this stay-warm case, and is communicated with supplying heat source by pipeline.
Further, described equipment also comprises for the water reuse device that the filter cloth that removes after flyash-calcium silicate slag filter cake is rinsed and alkali regenerating unit that the filter cloth after rinsing is soaked.
Further, described water reuse device is the tank that spraying mechanism is set, and described alkali regenerating unit is for can make the lye vat of filter cloth from wherein passing through.
Adopt above-mentioned flyash-calcium silicate slag to separate and the separating and washing methods of washing plant, described flyash-calcium silicate slag comprises the steps: for collection from flyash stripping slurries contains isolate after the thick liquid of aluminium
Flyash stripping slurries are placed on the filter cloth of rubber belt type filter, starting rubber belt type filter makes described flyash stripping slurries with in the filter cloth moving process, realize the flyash-calcium silicate slag and contain separating of the thick liquid of aluminium, filter cloth drives the flyash-calcium silicate slag of keeping somewhere thereon to be continued to move, and the described thick liquid of aluminium that contains is collected stand-by;
With washing lotion, described flyash-calcium silicate slag is washed, collect the flyash-calcium silicate slag filter cake after washing; After reclaiming, the washing lotion that described filtration obtains can be used as the recycling of flyash dissolution fluid.
Further, the solids content of described flyash stripping slurries is 50-200g/l.
Further, separate the water content contain the flyash-calcium silicate slag after the thick liquid of aluminium when being 40-50%, with washing lotion, described flyash-calcium silicate slag is washed.
Further, the washing lotion that described washing is adopted be temperature greater than 60 ℃, and concentration is less than the aqueous sodium hydroxide solution of 10g/l or the temperature water greater than 60 ℃.The washing lotion that described washing is adopted is that temperature is that water or the temperature of 80-100 ℃ is 80-100 ℃, and concentration is less than the aqueous sodium hydroxide solution of 10g/l.
Further, utilize washing lotion that described flyash-calcium silicate wash heat is washed 1-5 time, make the flyash-calcium silicate slag filter cake after washing adhere to alkali with Na
2O is for counting lower than 5kg/t.
Further, the envrionment temperature of keeping the operation of described filtration and/or washing is 50-95 ℃.
Further, also comprise, after collecting described flyash-calcium silicate slag filter cake, the filter cloth of rubber belt type filter is carried out manipulation of regeneration.
Further, described manipulation of regeneration is: at first adopt hot water more than 60 ℃ to filter cloth washing, then adopt concentration greater than 100g/l, and temperature is soaked filter cloth 2～20 minutes greater than the aqueous sodium hydroxide solution of 70 ℃.
Further, described manipulation of regeneration is: after flyash-calcium silicate slag filter cake is collected, keep in the process that filter cloth moves, first use the hot water injection's filter cloth more than 60 ℃, then make filter cloth from temperature greater than 70 ℃, concentration greater than the aqueous sodium hydroxide solution of 100g/l through and realize immersion to filter cloth, and to make described soak time be 2～20 minutes.
The utility model flyash-calcium silicate slag separates and washing plant science, reasonable.Separate to compare with the prior art subsider and have the following advantages:
1), can effectively realize flyash-calcium silicate slag in flyash stripping slurries by the utility model and contain the sharp separation of the thick liquid of aluminium, reduce the loss that in the sepn process of flyash stripping slurries, secondary reaction causes, improve 2-5 percentage point of digesting efficiency of alumina, improve 1-3 percentage point of sodium oxide solubility rate;
2), the utility model flyash-calcium silicate slag with contain the thick liquid of aluminium and separate by filter cloth, be not subjected to the restriction of flyash calcium silicate slag sedimentation capacity, contain the thick liquid rate of recovery of aluminium after the flyash-calcium silicate slag separates and increase substantially, further improved the production efficiency of aluminum oxide;
3), because rubber belt type filter filters flyash-calcium silicate slag efficient higher than subsider, contain the thick liquid hold-up of aluminium in the flyash-calcium silicate slag that obtains lower, and then reduced flyash-calcium silicate wash heat liquid consumption.
Description of drawings
Fig. 1 is the structural representation of the separation of the utility model flyash-calcium silicate slag and washing plant.
By reference to the accompanying drawings, in the utility model embodiment, Reference numeral is as follows:
1-filter cloth 2-filtrate receiver 3-washing lotion groove
4-filter cake receiving tank 5-water reuse device 6-alkali reclaim equiment
7-filter import 8-sprinkling equipment 9-stay-warm case
Embodiment
Fig. 1 is the structural representation of the separation of the utility model flyash-calcium silicate slag and washing plant.
the present embodiment provides the equipment of a kind of flyash-calcium silicate slag separation and washing methods, as shown in Figure 1, this equipment comprises rubber belt type filter, filtrate receiver 2, washing lotion groove 3 and filter cake receiving tank 4, described rubber belt type filter is followed successively by filtrating area and washing section along filter cloth 1 working direction, the filtrate outlet that described filtrating area and washing section are corresponding is communicated with filtrate receiver 2 and washing lotion groove 3 respectively, and arrange near described washing section and can spray to washing section the sprinkling equipment 8 of washing lotion, described filter cake receiving tank 4 is for being positioned at the washing section rear end, be used for collecting the receiving tank that washing section forms filter cake.
Be appreciated that filtrating area and washing section do not have obvious boundary, there is no spacer device between two functional zone.The filtrating area of the equipment of the separation of flyash-calcium silicate slag and washing methods can be with the solid in the flyash-calcium silicate slag and liquid separation, and washing section cleans the flyash-calcium silicate slag by trickle, and the flyash-calcium silicate slag is separated with scavenging solution.
Filtrating area and washing section also are provided with thermal insulator, and thermal insulator is provided with heat exchanging medium passage for filter cloth is communicated with vapour line by pipeline from the tunnel like stay-warm case 9 that wherein passes through in this stay-warm case, and is communicated with supplying heat source by pipeline.Supplying heat source can be hot steam or hot water, passes into steam in the present embodiment in stay-warm case to guarantee that the interior operating environment temperature of stay-warm case 9 is as 50-95 ℃.The setting of stay-warm case 9 can effectively extend the hard cycle of knot of filter cloth.
The flyash-calcium silicate slag separates and the equipment of washing methods also comprises for the water reuse device 5 that the filter cloth that removes after filter cake is rinsed and the alkali regenerating unit 6 that the filter cloth after flushing is soaked.Water reuse device 5 is for arranging the tank of spraying mechanism, and described alkali regenerating unit is equipped with aqueous sodium hydroxide solution for can make the lye vat of filter cloth from wherein passing through in described lye vat.Filter cloth water reuse device 5 and filter cloth alkali regenerating unit 6 unite the regeneration that use can realize filter cloth.
The principle of work of the equipment of the separation of the present embodiment flyash-calcium silicate slag and washing methods: flyash stripping slurries to be filtered are placed on filter cloth 1 by rubber belt type filter import 7.Flyash stripping slurries to be filtered move to filtrating area with filter cloth 1, and flyash stripping slurries filter through filter cloth 1 and obtain the flyash-calcium silicate slag and contain the thick liquid of aluminium.Contain the thick liquid of aluminium and come together in filtrate receiver 2 by filtrate outlet, then be delivered to the downstream and put forward aluminium technique.
The flyash-calcium silicate slag continues mobile with filter cloth 1, move to washing section, is positioned at the washing lotion sprinkling equipment 8 of filter cloth 1 top to flyash-calcium silicate slag filter cake spray washing lotion, and flyash-calcium silicate slag filter cake is washed.In the time of washing, the flyash-calcium silicate slag that contains washing lotion is filtered by filter cloth 1, obtains flyash-calcium silicate slag filter cake and washing lotion; The washing lotion that filtration obtains comes together in washing lotion groove 3 by the washing section filtrate outlet, and the washing lotion in washing lotion groove 3 can be used as the recycling of flyash dissolution fluid; Flyash-calcium silicate slag filter cake enters filter cake receiving tank 4 from washing section rear end discharge.
After above-mentioned sequence of operations, filter cloth 1 enters water reuse device 5 and alkali regenerating unit 6 successively, is eliminated through the foreign matter on 5 washings of water reuse device and alkali regenerating unit 6 dipping by lye filter clothes.Filter cloth 1 after the removing foreign matter returns near rubber belt type filter import 7, continues to filter the flyash stripping slurries from rubber belt type filter import 7.
Particularly, adopting the disclosed flyash-calcium silicate slag of the present embodiment to separate separates and washing methods with washing plant, the flyash stripping slurries that adopt are that flyash extracts one section, aluminum oxide or two sections or two sections flyash stripping solidliquid mixtures that merge stripping, and its solids content is 100g/l.
The flyash-calcium silicate slag separate and washing plant separate and washing methods comprises the steps:
Above-mentioned flyash stripping slurries are placed on the filter cloth of DU rubber belt type filter, starting rubber belt type filter makes described flyash stripping slurries with in the filter cloth moving process, realize the flyash-calcium silicate slag and contain separating of the thick liquid of aluminium, filter cloth drive to be kept somewhere thereon flyash-calcium silicate slag and is continued mobilely, contains the thick liquid of aluminium and enters the follow-up aluminium technique of putting forward; Described filter cloth is the filter cloth with realized solid-liquid separation of certain pore size and voidage, for example: woven fabric or non-woven fabrics; During filtration, the operating environment temperature is 75 ℃.
When the water content that obtains the flyash-calcium silicate slag through filter-cloth filtering when flyash stripping slurries is 45%, with washing lotion, described flyash-calcium silicate slag is washed, the attached alkali of eccysis flyash-calcium silicate slag filter cake, the washing lotion that washing is adopted is that temperature is the water of 80-100 ℃, during washing, the operating environment temperature is 50-95 ℃, and washing times is 3 times.In the time of washing, contain the flyash-calcium silicate slag of washing lotion by filter-cloth filtering, flyash-calcium silicate slag filter cake and washing lotion after being washed.Collect the flyash-calcium silicate slag filter cake after washing, the flyash-calcium silicate slag filter cake after washing adheres to alkali with Na
2O is for counting lower than 5kg/t.
After reclaiming, the washing lotion that filtration obtains can be used as the recycling of flyash dissolution fluid.
Through more above-mentioned row separation, washing process, obstruction easily occurs and affects circulating filtration in filter cloth, so need the filter cloth of rubber belt type filter is carried out manipulation of regeneration, described manipulation of regeneration is: after flyash-calcium silicate slag filter cake is collected, keep in the process that filter cloth moves, first use hot water injection's filter cloth 1 minute of 80 ℃, then make filter cloth from temperature be 70 ℃, concentration be the aqueous sodium hydroxide solution of 200g/l through realizing the immersion to filter cloth, and to make described soak time be 15 minutes.
Adopt the disclosed flyash-calcium silicate slag of the present embodiment to separate and washing plant, can effectively realize flyash-calcium silicate slag in flyash stripping slurries and the sharp separation that contains the thick liquid of aluminium, reduce the loss of flyash stripping slurries secondary reaction in sepn process, improved simultaneously the concentration that contains the thick liquid of aluminium, further improve digesting efficiency of alumina, compare existing subsider isolation technique, in the present embodiment, digesting efficiency of alumina improves 4 percentage points, improves 2 percentage points of sodium oxide solubility rates.In addition, because rubber belt type filter filters flyash-calcium silicate slag efficient higher than subsider, make flyash-calcium silicate slag filter cake washing discharge reduction, more than commerical test filter cake leaching requirement can reduce by 5 one-tenth.
It should be noted that at last: above each embodiment is not intended to limit only in order to the technical solution of the utility model to be described; Although with reference to aforementioned each embodiment, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of each embodiment technical scheme of the utility model.
Claims (5)
1. a flyash-calcium silicate slag separates and washing plant, it is characterized in that, comprise rubber belt type filter, filtrate receiver, washing lotion groove and filter cake receiving tank, described rubber belt type filter is followed successively by filtrating area and washing section along the filter cloth working direction, the filtrate outlet that described filtrating area and washing section are corresponding is communicated with filtrate receiver and washing lotion groove respectively, and arrange near described washing section and can spray to washing section the sprinkling equipment of washing lotion, described filter cake receiving tank is used for collecting for being positioned at the washing section rear end receiving tank that washing section forms filter cake.
2. the flyash-calcium silicate slag separates and washing plant according to claim 1, it is characterized in that, described equipment also comprises thermal insulator, and it is arranged at described filtrating area and/or washing section.
3. the flyash-calcium silicate slag separates and washing plant according to claim 2, it is characterized in that, described thermal insulator is provided with heat exchanging medium passage for can make the tunnel like stay-warm case of filter cloth from wherein passing through in this stay-warm case, and is communicated with supplying heat source by pipeline.
4. the flyash-calcium silicate slag separates and washing plant according to claim 1, it is characterized in that, described equipment also comprises for the water reuse device that the filter cloth that removes after filter cake is rinsed and the alkali regenerating unit that the filter cloth after rinsing is soaked.
5. flyash-calcium silicate slag claimed in claim 4 separates and washing plant, it is characterized in that, described water reuse device is the tank that spraying mechanism is set, and described alkali regenerating unit is for can make the lye vat of filter cloth from wherein passing through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205793896U CN202988763U (en) | 2012-11-06 | 2012-11-06 | Separation and washing device for coal ash silicon-calcium slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205793896U CN202988763U (en) | 2012-11-06 | 2012-11-06 | Separation and washing device for coal ash silicon-calcium slag |
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| CN202988763U true CN202988763U (en) | 2013-06-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897809A (en) * | 2012-11-06 | 2013-01-30 | 大唐国际发电股份有限公司 | Method and equipment for separating and washing fly ash calcium silicate slag |
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2012
- 2012-11-06 CN CN2012205793896U patent/CN202988763U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897809A (en) * | 2012-11-06 | 2013-01-30 | 大唐国际发电股份有限公司 | Method and equipment for separating and washing fly ash calcium silicate slag |
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Granted publication date: 20130612 |
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| CX01 | Expiry of patent term |