CN102897809A - Method and equipment for separating and washing fly ash calcium silicate slag - Google Patents
Method and equipment for separating and washing fly ash calcium silicate slag Download PDFInfo
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- CN102897809A CN102897809A CN2012104382082A CN201210438208A CN102897809A CN 102897809 A CN102897809 A CN 102897809A CN 2012104382082 A CN2012104382082 A CN 2012104382082A CN 201210438208 A CN201210438208 A CN 201210438208A CN 102897809 A CN102897809 A CN 102897809A
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Abstract
The invention provides a method and equipment for separating and washing fly ash calcium silicate slag. The fly ash calcium silicate slag is a separated substance left after aluminum-containing crude liquid is collected from fly ash dissolved slurry. The method for separating and washing the fly ash calcium silicate slag comprises the following steps of: putting the fly ash dissolved slurry on filter cloth of a rubber belt filter, starting the rubber belt filter, separating the fly ash calcium silicate slag from the aluminum-containing crude liquid when the fly ash dissolved slurry moves together with the filter cloth, and driving the fly ash calcium silicate slag left on the filter cloth to continuously move by the filter cloth; and washing the fly ash calcium silicate slag by using lotion, and collecting the washed fly ash calcium silicate slag filter cakes. The invention also discloses the equipment for implementing the method for separating and washing the fly ash calcium silicate slag. By the method and the equipment, quick separation of the fly ash calcium silicate slag and the aluminum-containing crude liquid in the fly ash calcium silicate slag dissolved slurry is realized, the loss of secondary reaction in the fly ash clinker dissolution and separation process is reduced, and the dissolution rate of alumina is improved.
Description
Technical field
The present invention relates to the flyash comprehensive treatment technique, relate in particular to the separation of a kind of flyash-calcium silicate slag and washing methods and equipment.
Background technology
Alumina content is generally 17%-35% in the flyash, 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 in recent years focus of research in recent years.The method of extracting aluminum oxide in the existing aluminous fly-ash mainly is with the alumina leaching in the 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 is that the patent of CN101628725 discloses a kind of method and device by Fast Stripping aluminum oxide in the aluminous fly-ash sintered clinker such as publication number.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 difference in specific gravity hour just is difficult to realize effectively settlement separate between the solid-liquid.As working as Al in the 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 effectively solid-liquid separation.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.
Summary of the invention
The object of the invention is to, 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 methods, with realize flyash-calcium silicate slag in the flyash stripping slurries and the sharp separation that contains the thick liquid of aluminium, reduce secondary reaction loss in the flyash grog stripping sepn process, improve digesting efficiency of alumina.
For achieving the above object, the technical solution used in the present invention is: a kind of flyash-calcium silicate slag separates and washing methods, and described flyash-calcium silicate slag comprises the steps: for collect the isolate that contains behind the thick liquid of aluminium from flyash stripping slurries
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 behind 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 80-100 ℃ water or temperature 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 the washing adhere to alkali with Na
2O is lower than 5kg/t for meter.
Further, the envrionment temperature of keeping the operation of described filtration and/or washing is 50-95 ℃.
Further, also comprise, collect described flyash-calcium silicate slag filter cake after, 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 70 ℃ aqueous sodium hydroxide solution.
Further, described manipulation of regeneration is: after flyash-calcium silicate slag filter cake is collected, keep in the process that filter cloth moves, use first 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.
It is a kind of for realizing that the flyash-calcium silicate slag separates and the equipment of washing that another object of the present invention also provides, 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 the sprinkling equipment that can spray to washing section washing lotion is set near the described washing section, described filter cake receiving tank is used for collecting the receiving tank that washing section forms filter cake for being positioned at the washing section rear end.
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 behind the flyash-calcium silicate slag filter cake is washed and alkali regenerating unit that the filter cloth after flushing 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.
Flyash-calcium silicate slag of the present invention separates and simple, the easy row of washing methods; The 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 the flyash stripping slurries by the present invention and contain the sharp separation of the thick liquid of aluminium, reduce the loss that secondary reaction causes in the sepn process of flyash stripping slurries, improve 2-5 percentage point of digesting efficiency of alumina, improve 1-3 percentage point of sodium oxide solubility rate;
2), flyash-calcium silicate slag of the present invention 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), be higher than subsider because rubber belt type filter filters flyash-calcium silicate slag efficient, 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 flyash-calcium silicate slag separation of the present invention and washing plant.
By reference to the accompanying drawings, Reference numeral is as follows in the embodiment of the invention:
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
The present embodiment discloses a kind of flyash-calcium silicate slag to be separated and washing methods, and the flyash stripping slurries that the present embodiment adopts are that flyash extracts one section in aluminum oxide or two sections or two sections flyash stripping solidliquid mixtures that merge stripping, and its solids content is 100g/l.
Particularly, the separation of flyash-calcium silicate slag and washing methods comprise 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; The operating environment temperature is 75 ℃ during filtration.
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 80-100 ℃ water, the operating environment temperature is 50-95 ℃ during washing, 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 obtaining washing.Collect the flyash-calcium silicate slag filter cake after washing, the flyash-calcium silicate slag filter cake after the washing adheres to alkali with Na
2O is lower than 5kg/t for meter.
After reclaiming, the washing lotion that filtration obtains can be used as the recycling of flyash dissolution fluid.
Through above-mentioned a series of 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, use first 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.
The disclosed flyash-calcium silicate slag of the present embodiment separates and washing methods, can effectively realize flyash-calcium silicate slag in the 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, digesting efficiency of alumina improves 4 percentage points in the present embodiment, improves 2 percentage points of sodium oxide solubility rates.In addition, because filtering flyash-calcium silicate slag efficient, rubber belt type filter is higher than subsider, so that flyash-calcium silicate slag filter cake washing discharge reduction, more than commerical test filter cake leaching requirement can reduce by 5 one-tenth.
The present embodiment discloses a kind of flyash-calcium silicate slag to be separated and washing methods, and the flyash stripping slurries that the present embodiment adopts are that flyash extracts the flyash stripping slurries that aluminum oxide obtains, and its solids content is 80g/l.
Particularly, the separation of flyash-calcium silicate slag and washing methods comprise the steps:
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 and continues mobile; Described filter cloth is non-woven fabrics; The operating environment temperature is 85 ℃ during filtration.
Separate the water content contain the flyash-calcium silicate slag behind the thick liquid of aluminium when being 50%, with washing lotion described flyash-calcium silicate slag is washed, collect the flyash-calcium silicate slag filter cake after the washing; Filtration obtains contains the thick liquid of aluminium and enters the follow-up aluminium technique of putting forward;
The washing lotion that washing is adopted is that temperature is 90 ℃, and concentration is less than the aqueous sodium hydroxide solution of 10g/l, and the operating environment temperature is 75 ℃ during washing, and described washing times is 2 times.In the time of washing, contain the flyash-calcium silicate slag of washing lotion by filter-cloth filtering, obtain flyash-calcium silicate slag filter cake and washing lotion, the flyash-calcium silicate slag filter cake that obtains adheres to alkali with Na
2O is lower than 5kg/t for meter; After reclaiming, the washing lotion that filtration obtains can be used as the recycling of flyash dissolution fluid; Flyash-calcium silicate slag filter cake is discharged.
After flyash-calcium silicate slag filter cake washed, filter cloth to rubber belt type filter carries out manipulation of regeneration: at first adopt hot water more than 60 ℃ to filter cloth washing, then adopting concentration is 150g/l, and temperature is 80 ℃ aqueous sodium hydroxide solution, and filter cloth was soaked 10 minutes.
Fig. 1 is the structural representation of flyash-calcium silicate slag separation of the present invention and washing plant.
The present embodiment provides the equipment of a kind of embodiment of realization 1 or embodiment 2 described flyash-calcium silicate slags 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 the sprinkling equipment 8 that can spray to washing section washing lotion is set near the described washing section, described filter cake receiving tank 4 is used for collecting the receiving tank that washing section forms filter cake for being positioned at the washing section rear end.
Be appreciated that filtrating area and washing section do not have obvious boundary, do not have 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 the stay-warm case to guarantee that operating environment temperature in the stay-warm case 9 is as 50-95 ℃.The setting of stay-warm case 9 can effectively prolong 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 behind the filter cake is washed and the alkali regenerating unit 6 that the filter cloth after washing 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 the 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 the 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 the 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 the washing lotion groove 3 by the washing section filtrate outlet, and the washing lotion in the washing lotion groove 3 can be used as the recycling of flyash dissolution fluid; Flyash-calcium silicate slag filter cake is discharged from the washing section rear end, enters filter cake receiving tank 4.
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 the alkali regenerating unit 6 dipping by lye filter clothes.Filter cloth 1 behind the removing foreign matter returns near the rubber belt type filter import 7, continues to filter the flyash stripping slurries from rubber belt type filter import 7.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment 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 various embodiments of the present invention technical scheme.
Claims (14)
1. a flyash-calcium silicate slag separates and washing methods, and described flyash-calcium silicate slag is characterized in that for collect the isolate that contains behind the thick liquid of aluminium from flyash stripping slurries, comprises the steps:
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 and continues mobile;
With washing lotion described flyash-calcium silicate slag is washed, collect the flyash-calcium silicate slag filter cake after washing.
2. described flyash-calcium silicate slag separates and washing methods according to claim 1, it is characterized in that, the solids content of described flyash stripping slurries is 50-200g/l.
3. described flyash-calcium silicate slag separates and washing methods according to claim 1, it is characterized in that, separation contains the flyash-calcium silicate slag behind the thick liquid of aluminium, with washing lotion described flyash-calcium silicate slag is washed.
4. described flyash-calcium silicate slag separates and washing methods according to claim 1, it is characterized in that, 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 ℃.
According to claim 1 or 4 described flyash-calcium silicate slags separate and washing methodss, it is characterized in that, utilize washing lotion that described flyash-calcium silicate wash heat is washed 1-5 time, make the flyash-calcium silicate slag filter cake after the washing adhere to alkali with Na
2O is lower than 5kg/t for meter.
6. described flyash-calcium silicate slag separates and washing methods according to claim 1, it is characterized in that, the envrionment temperature of keeping the operation of described filtration and/or washing is 50-95 ℃.
7. described flyash-calcium silicate slag separates and washing methods according to claim 1, it is characterized in that, also comprises, collect described flyash-calcium silicate slag filter cake after, the filter cloth of rubber belt type filter is carried out manipulation of regeneration.
8. described flyash-calcium silicate slag separates and washing methods according to claim 7, it is characterized in that, 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 70 ℃ aqueous sodium hydroxide solution.
9. described flyash-calcium silicate slag separates and washing methods according to claim 8, it is characterized in that, described manipulation of regeneration is: after filter cake is collected, keep in the process that filter cloth moves, use first 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.
10. one kind is used for realizing that the flyash-calcium silicate slag separates and the equipment of washing, 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 the sprinkling equipment that can spray to washing section washing lotion is set near the described washing section, described filter cake receiving tank is used for collecting the receiving tank that washing section forms filter cake for being positioned at the washing section rear end.
11. described flyash-calcium silicate slag separates and washing plant according to claim 10, it is characterized in that, described equipment also comprises thermal insulator, and it is arranged at described filtrating area and/or washing section.
12. described flyash-calcium silicate slag separates and washing plant according to claim 11, 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.
13. described flyash-calcium silicate slag separates and washing plant according to claim 10, it is characterized in that, described equipment also comprises for the water reuse device that the filter cloth that removes behind the filter cake is washed and the alkali regenerating unit that the filter cloth after flushing is soaked.
14. the described flyash-calcium silicate slag of claim 13 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.
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| CN2012104382082A CN102897809A (en) | 2012-11-06 | 2012-11-06 | Method and equipment for separating and washing fly ash calcium silicate slag |
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| CN2012104382082A CN102897809A (en) | 2012-11-06 | 2012-11-06 | Method and equipment for separating and washing fly ash calcium silicate slag |
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| CN103349865A (en) * | 2013-05-17 | 2013-10-16 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Tilting-pan filter filtration cloth regeneration method |
| CN103880049A (en) * | 2014-01-26 | 2014-06-25 | 内蒙古蒙西鄂尔多斯铝业有限公司 | Device and method for separating and washing leaching slurry of fly ash sintered alumina powder |
| CN105670059A (en) * | 2014-11-18 | 2016-06-15 | 神华集团有限责任公司 | Silicon-calcium slag, silicon-calcium slag-based rubber filler, and preparation method thereof |
| WO2022213589A1 (en) * | 2021-04-09 | 2022-10-13 | 湖州核华环保科技有限公司 | Rubber belt-type vacuum filter for efficient separation and filtration of solid waste silicon and aluminum |
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| WO2022213589A1 (en) * | 2021-04-09 | 2022-10-13 | 湖州核华环保科技有限公司 | Rubber belt-type vacuum filter for efficient separation and filtration of solid waste silicon and aluminum |
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Application publication date: 20130130 |