CN117185692A - Concrete admixture based on water-washed sand sludge and preparation method thereof - Google Patents
Concrete admixture based on water-washed sand sludge and preparation method thereof Download PDFInfo
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- CN117185692A CN117185692A CN202311158902.3A CN202311158902A CN117185692A CN 117185692 A CN117185692 A CN 117185692A CN 202311158902 A CN202311158902 A CN 202311158902A CN 117185692 A CN117185692 A CN 117185692A
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- 239000010802 sludge Substances 0.000 title claims abstract description 91
- 239000004567 concrete Substances 0.000 title claims abstract description 44
- 239000004576 sand Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 45
- 239000003245 coal Substances 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000000227 grinding Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 239000000428 dust Substances 0.000 claims description 56
- 239000007789 gas Substances 0.000 claims description 24
- 239000004744 fabric Substances 0.000 claims description 18
- 239000002912 waste gas Substances 0.000 claims description 15
- 238000001354 calcination Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000002918 waste heat Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 239000002956 ash Substances 0.000 description 10
- 239000004568 cement Substances 0.000 description 8
- 239000011575 calcium Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 206010016256 fatigue Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a concrete admixture based on water-washed sand sludge and a preparation method thereof, comprising the following steps: 1) Drying and crushing the sludge to obtain sludge powder; 2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel; 3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating; 4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker; 5) Rolling and ball milling the clinker to obtain a finished product; the admixture prepared by taking the water-washed sand sludge as the raw material has better performance, the fluidity ratio reaches 105%, the water content is 0.34%, the loss on ignition is 1.34%, and the 28d activity index can reach 88%.
Description
Technical Field
The invention relates to the technical field of concrete admixture, in particular to a preparation method of concrete admixture based on water-washed sand sludge.
Background
The concrete admixture is to improve the concrete performance, save water, regulate the strength grade of concrete and mix natural or artificial powdered mineral matter to improve the concrete performance. The blends can be classified into active blends and inactive blends. The active mineral admixture itself does not harden or has very slow hardening speed, but can be coagulated and hardened to generate strength after being mixed with lime, slaked lime and other calcareous materials by adding water, or reacts with calcium hydroxide generated by hydration of cement to generate hydration products with gelling capability, such as fly ash, granulated blast furnace slag powder, zeolite powder, silica fume and the like. In engineering practice, a double-mixing technology is often adopted, namely, the fly ash is mixed and the water reducer is mixed. The common, high-strength and high-performance concrete prepared by the method can save cement, improve the workability, strength and durability of the concrete, obviously reduce the hydration heat of the mass concrete and meet the construction technical requirements of different projects.
Slurry waste water is generated in the sand washing process, and the larger the sand washing amount is, the more slurry and waste water are generated. If the waste water is directly discharged without any treatment, the waste water not only pollutes the environment, but also causes river blockage. The general sand washing factory has great sedimentation tank to let mud deposit naturally, then discharges the clear water in the pond, digs out the bottom of the pool subsides mud, and the water-washed sand sediment that obtains is general directly to be buried or stack, more difficult handling. But the main component in the sludge comprises SiO 2 、CaMg(CO 3 ) 2 、CaCO 3 、Al 2 SiO 5 、Al 2 O 3 CaO; wherein Si0 2 And Al 2 0 3 Can generate Ca (OH) with the components in the cement 2 The reaction generates C-S-H and C-A-H, and the hydrated calcium sulfoaluminate not only improves the early strength of the concrete, but also improves the later strength of the concrete, so that the cement consumption is reduced. Therefore, the concrete admixture can be prepared by taking the water-washed sand sludge as a raw material, the recycling of waste sludge is realized, the cost is saved, and the problem of treatment of the water-washed sand sludge is solved.
Gangue is an industrial solid discharged during coal mining in coal industryWaste materials are piled up like mountains in coal mines and surrounding areas, and are continuously discharged year by year, so that the waste materials occupy land and pollute the environment. The comprehensive utilization of coal gangue has long been one of the important research and development problems in the coal and building material industry. At present, partial gangue containing a certain heating value is used for brickmaking and power generation, and the main components of natural gangue comprise Al 2 O 3 、SiO 2 In addition, fe is contained in different amounts 2 O 3 、CaO、MgO、Na 2 O、K 2 O、P 2 O 5 、SO 3 And trace rare elements, the gangue has a certain heat value, and if the gangue is directly used as an admixture raw material, the gangue is easy to cause low-temperature anoxic combustion during calcination and preheating to cause the phenomenon of blocking of the cyclone barrel. Because the composition components of the gangue are greatly changed along with different production places, the defect of theoretical research on the gangue is also restrained to a great extent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a concrete admixture based on water-washed sand sludge.
The aim of the invention is achieved by the following technical scheme: a preparation method of concrete admixture based on water-washed sand sludge comprises the following steps:
1) Drying and crushing the sludge to obtain sludge powder;
2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel;
3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating;
4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker;
5) Rolling and ball milling the clinker to obtain a finished product;
further, the tail gas of the preheater in the step 3) is sent to the step 1) for supplementing a heat source for drying and crushing the sludge;
further, the waste heat and the waste gas of the grate cooler in the step 4) are sent to the step 2) and are used for providing a drying heat source for coal gangue grinding; part of the high-temperature waste gas at the front end of the grate cooler is used as kiln-entering secondary air; part of the waste gas is sent to the decomposing furnace by a tertiary air pipe to be used as combustion air; the other part is sent to the step 2) by a waste heat air pipe to provide a drying heat source for coal gangue grinding; cooling the rest waste gas, collecting dust by a dust remover, and discharging the dust into the atmosphere;
further, when the step 3) enters the preheater, auxiliary materials are added into the sludge powder; the auxiliary material is black earth powder or green shale powder;
further, when the step 3) enters the preheater, dust is also added into the sludge powder; the dedusting ash is from a tail gas dedusting system for drying and crushing the sludge in the step 1) and a tail gas dedusting system for drying and grinding the coal gangue in the step 2);
further, the tail gas obtained by drying and crushing the sludge in the step 1) is separated and collected into dust through a material collector, enters a heat exchanger under the action of a high-temperature fan, enters a cloth bag dust removing system after heat exchange and cooling, and the dust separated and collected through the cloth bag dust removing system is used as dust;
further, the dried and ground coal gangue and waste gas in the step 2) enter a cloth bag dust removing system, the separated coal gangue is sent into a decomposing furnace to be used as fuel, and the separated dust is used as dust removal ash;
further, in the step 3), the preheater is preheated to 200-400 ℃ and then is fed into a decomposing furnace, the decomposing temperature of the decomposing furnace is 500-800 ℃, and the decomposing time is 2-24 hours;
further, the calcination temperature in the rotary kiln in the step 4) is 1100-1150 ℃ and the calcination time is 5-48 h.
The invention also provides a concrete admixture based on the water-washed sand sludge, which is prepared by adopting the preparation method of the concrete admixture based on the water-washed sand sludge.
The invention has the following advantages:
1. the admixture prepared by taking the water-washed sand sludge as the raw material has better performance, the fluidity ratio reaches 105%, the water content is 0.34%, the loss on ignition is 1.34%, the 28d activity index can reach 88%, and the admixture is dopedThe sludge in the feed stock contains active Si0 2 And Al 2 0 3 Ca (OH) is generated with the components in the cement 2 The reaction generates C-S-H and C-A-H, and the hydrated calcium sulfoaluminate can improve the early strength of the concrete, improve the later strength of the concrete and reduce the cement consumption; the gangue in the admixture raw material is dried and ground and then is used as fuel in a decomposing furnace, so that the cyclone cylinder is prevented from being blocked in the preheating process, and meanwhile, the gangue is burnt in the decomposing furnace and then is sent into a rotary kiln to be calcined together with sludge to prepare the concrete composite admixture, so that the gangue can be comprehensively utilized, and the problem that the gangue is limited in application in the concrete admixture is solved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Figure 2 is an XRD pattern of sludge clinker.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present invention and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1: as shown in fig. 1, the preparation method of the concrete admixture based on the water-washed sand sludge comprises the following steps:
1) Drying and crushing the sludge to obtain sludge powder;
2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel;
3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating;
4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker;
5) Rolling and ball milling the clinker to obtain a finished product;
further, the tail gas of the preheater in the step 3) is sent to the step 1) for supplementing a heat source for drying and crushing the sludge;
further, the waste heat and the waste gas of the grate cooler in the step 4) are sent to the step 2) and are used for providing a drying heat source for coal gangue grinding;
further, when the step 3) enters the preheater, auxiliary materials are added into the sludge powder; the auxiliary material is black earth powder or green shale powder;
further, when the step 3) enters the preheater, dust is also added into the sludge powder; the dedusting ash is from a tail gas dedusting system for drying and crushing the sludge in the step 1) and a tail gas dedusting system for drying and grinding the coal gangue in the step 2);
further, the tail gas obtained by drying and crushing the sludge in the step 1) is separated and collected into dust through a material collector, enters a heat exchanger under the action of a high-temperature fan, enters a cloth bag dust removing system after heat exchange and cooling, and the dust separated and collected through the cloth bag dust removing system is used as dust;
further, the dried and ground coal gangue and waste gas in the step 2) enter a cloth bag dust removing system, the separated coal gangue is sent into a decomposing furnace to be used as fuel, and the separated dust is used as dust removal ash;
further, in the step 3), the preheater is preheated to 200-400 ℃ and then is fed into a decomposing furnace, the decomposing temperature of the decomposing furnace is 500-800 ℃, and the decomposing time is 2-24 hours;
further, the calcination temperature in the rotary kiln in the step 4) is 1100-1150 ℃ and the calcination time is 5-48 h.
Example 2: a preparation method of concrete admixture based on water-washed sand sludge comprises the following steps:
1) Drying and crushing the sludge to obtain sludge powder;
2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel;
3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating;
4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker;
5) Rolling and ball milling the clinker to obtain a finished product;
further, the tail gas of the preheater in the step 3) is sent to the step 1) for supplementing a heat source for drying and crushing the sludge;
further, the waste heat and the waste gas of the grate cooler in the step 4) are sent to the step 2) and are used for providing a drying heat source for coal gangue grinding;
further, when the step 3) enters the preheater, dust is also added into the sludge powder; the dedusting ash is from a tail gas dedusting system for drying and crushing the sludge in the step 1) and a tail gas dedusting system for drying and grinding the coal gangue in the step 2);
further, the tail gas obtained by drying and crushing the sludge in the step 1) is separated and collected into dust through a material collector, enters a heat exchanger under the action of a high-temperature fan, enters a cloth bag dust removing system after heat exchange and cooling, and the dust separated and collected through the cloth bag dust removing system is used as dust;
further, the dried and ground coal gangue and waste gas in the step 2) enter a cloth bag dust removing system, the separated coal gangue is sent into a decomposing furnace to be used as fuel, and the separated dust is used as dust removal ash;
further, in the step 3), the preheater is preheated to 200-400 ℃ and then is fed into a decomposing furnace, the decomposing temperature of the decomposing furnace is 500-800 ℃, and the decomposing time is 2-24 hours;
further, the calcination temperature in the rotary kiln in the step 4) is 1100-1150 ℃ and the calcination time is 5-48 h.
Example 3: a preparation method of concrete admixture based on water-washed sand sludge comprises the following steps:
1) Drying and crushing the sludge to obtain sludge powder;
2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel;
3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating;
4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker;
5) Rolling and ball milling the clinker to obtain a finished product;
further, the tail gas of the preheater in the step 3) is sent to the step 1) for supplementing a heat source for drying and crushing the sludge;
further, the waste heat and the waste gas of the grate cooler in the step 4) are sent to the step 2) and are used for providing a drying heat source for coal gangue grinding;
further, when the step 3) enters the preheater, auxiliary materials are added into the sludge powder; the auxiliary material is black soil powder;
further, when the step 3) enters the preheater, dust is also added into the sludge powder; the dedusting ash is from a tail gas dedusting system for drying and crushing the sludge in the step 1) and a tail gas dedusting system for drying and grinding the coal gangue in the step 2);
further, the tail gas obtained by drying and crushing the sludge in the step 1) is separated and collected into dust through a material collector, enters a heat exchanger under the action of a high-temperature fan, enters a cloth bag dust removing system after heat exchange and cooling, and the dust separated and collected through the cloth bag dust removing system is used as dust;
further, the dried and ground coal gangue and waste gas in the step 2) enter a cloth bag dust removing system, the separated coal gangue is sent into a decomposing furnace to be used as fuel, and the separated dust is used as dust removal ash;
further, in the step 3), the preheater is preheated to 200-400 ℃ and then is fed into a decomposing furnace, the decomposing temperature of the decomposing furnace is 500-800 ℃, and the decomposing time is 2-24 hours;
further, the calcination temperature in the rotary kiln in the step 4) is 1100-1150 ℃ and the calcination time is 5-48 h.
Example 4: a preparation method of concrete admixture based on water-washed sand sludge comprises the following steps:
1) Drying and crushing the sludge to obtain sludge powder;
2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel;
3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating;
4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker;
5) Rolling and ball milling the clinker to obtain a finished product;
further, the tail gas of the preheater in the step 3) is sent to the step 1) for supplementing a heat source for drying and crushing the sludge;
further, the waste heat and the waste gas of the grate cooler in the step 4) are sent to the step 2) and are used for providing a drying heat source for coal gangue grinding;
further, when the step 3) enters the preheater, auxiliary materials are added into the sludge powder; the auxiliary material is green shale powder;
further, when the step 3) enters the preheater, dust is also added into the sludge powder; the dedusting ash is from a tail gas dedusting system for drying and crushing the sludge in the step 1) and a tail gas dedusting system for drying and grinding the coal gangue in the step 2);
further, the tail gas obtained by drying and crushing the sludge in the step 1) is separated and collected into dust through a material collector, enters a heat exchanger under the action of a high-temperature fan, enters a cloth bag dust removing system after heat exchange and cooling, and the dust separated and collected through the cloth bag dust removing system is used as dust;
further, the dried and ground coal gangue and waste gas in the step 2) enter a cloth bag dust removing system, the separated coal gangue is sent into a decomposing furnace to be used as fuel, and the separated dust is used as dust removal ash;
further, in the step 3), the preheater is preheated to 200-400 ℃ and then is fed into a decomposing furnace, the decomposing temperature of the decomposing furnace is 500-800 ℃, and the decomposing time is 2-24 hours;
further, the calcination temperature in the rotary kiln in the step 4) is 1100-1150 ℃ and the calcination time is 5-48 h.
Example 5: the concrete admixtures prepared by the method for preparing the concrete admixture based on the water-washed-sand sludge of examples 2 to 4 were subjected to a technical index test, and the results are shown in table 1 below.
TABLE 1 concrete admixture technical index test results based on washed-out sand sludge
The test results in Table 1 show that the loss on ignition of the sludge and the black soil exceeds the standard by more than 5.0, and the free calcium oxide content in the black soil reaches 7.49%, so that the loss on ignition is 9.68% in the standard, and the higher loss is an unqualified item, but the standard of the fly ash class III is combined in GB 1596-91. Because the sludge admixture contains active Si0 2 And Al 2 0 3 Ca (OH) is generated with the components in the cement 2 The reaction generates C-S-H and C-A-H, and the hydrated calcium sulfoaluminate not only improves the early strength of the concrete, but also improves the later strength of the concrete, so that the cement consumption is reduced. From the results shown in the table 1, it is clear that the physical activation and chemical activation are carried out after the sand washing sludge or the sand washing sludge is compounded with other minerals, so that the concrete admixture is good, and the concrete cost can be effectively reduced.
Example 6: the results of the phase and component detection of the sludge raw material and the clinker are shown in fig. 2 and table 2 below.
TABLE 2 comparison of sludge raw clinker component contents
As can be seen from the results of Table 2 in combination with FIG. 2, the sludge raw material and the clinker are both composed of SiO as the main components 2 、CaMg(CO 3 ) 2 、CaCO 3 、Al 2 SiO 5 、Al 2 O 3 And CaO, calcined CaMg (CO) 3 ) 2 The content is obviously reduced; and calcined SiO 2 The content is improved.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. A preparation method of a concrete admixture based on water-washed sand sludge is characterized by comprising the following steps: the method comprises the following steps:
1) Drying and crushing the sludge to obtain sludge powder;
2) Drying and grinding coal gangue, and then sending the coal gangue into a decomposing furnace to be used as fuel;
3) The sludge powder in the step 1) is sent into a preheater for preheating, and enters a decomposing furnace after preheating;
4) Feeding the materials which are decomposed in the decomposing furnace into a rotary kiln to be calcined into clinker, and cooling the clinker by a grate cooler to obtain clinker;
5) And rolling and ball milling the clinker to obtain the finished product.
2. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 1, which is characterized in that: and the tail gas of the preheater in the step 3) is sent into the step 1) and is used for supplementing a heat source for drying and crushing the sludge.
3. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 1, which is characterized in that: and (2) delivering the waste heat and the waste gas of the grate cooler in the step (4) into the step (2) for providing a drying heat source for coal gangue grinding.
4. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 1, which is characterized in that: when the step 3) enters the preheater, auxiliary materials are added into the sludge powder; the auxiliary material is black earth powder or green shale powder.
5. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 1, which is characterized in that: when the step 3) enters the preheater, dust is also added into the sludge powder; the dedusting ash is from a tail gas dedusting system for drying and crushing the sludge in the step 1) and a tail gas dedusting system for drying and grinding the coal gangue in the step 2).
6. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 5, which is characterized in that: the tail gas obtained by drying and crushing the sludge in the step 1) is separated and collected into dust through a material collector, enters a heat exchanger under the action of a high-temperature fan, enters a cloth bag dust removing system after heat exchange and cooling, and the dust separated and collected through the cloth bag dust removing system is used as dust.
7. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 5, which is characterized in that: and 2) feeding the dried and ground coal gangue and waste gas into a cloth bag dust removing system, and feeding the separated coal gangue into a decomposing furnace to be used as fuel, and taking the separated dust as dedusting ash.
8. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 1, which is characterized in that: in the step 3), the pre-heater is preheated to 200-400 ℃ and then is sent into a decomposing furnace, the decomposing temperature of the decomposing furnace is 500-800 ℃, and the decomposing time is 2-24 h.
9. The method for preparing the concrete admixture based on the water-washed sand sludge according to claim 1, which is characterized in that: the calcination temperature in the rotary kiln in the step 4) is 1100-1150 ℃ and the calcination time is 5-48 h.
10. A concrete admixture based on water-washed sand sludge is characterized in that: is prepared by adopting the concrete admixture preparation method based on the water-washed sand sludge as defined in any one of claims 1 to 7.
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