CN111646721A - Concrete admixture developed from sulfur-fixing ash and preparation method thereof - Google Patents
Concrete admixture developed from sulfur-fixing ash and preparation method thereof Download PDFInfo
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- CN111646721A CN111646721A CN202010692961.9A CN202010692961A CN111646721A CN 111646721 A CN111646721 A CN 111646721A CN 202010692961 A CN202010692961 A CN 202010692961A CN 111646721 A CN111646721 A CN 111646721A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
Abstract
The invention provides a concrete admixture developed by solid sulfur ash and a preparation method thereof. Meanwhile, the invention also provides a preparation method of the concrete admixture developed by the fluidized bed combustion ash slag, which comprises the following steps: pretreatment, alkali excitation, wall breaking and shaping (grinding), sorting and homogenization. The concrete admixture developed by the solid sulfur ash provided by the invention realizes large mixing amount and large batch use of the solid sulfur ash in concrete, realizes waste recycling, large-scale and resource utilization of solid wastes, and finally realizes unification of production benefits, environmental benefits, economic benefits and social benefits.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a concrete admixture developed by sulfur-fixing clinker and a preparation method thereof.
Background
In recent years, with the rapid development of coal-fired power plants in China, the discharge amount of solid wastes such as coal ash and slag generated along with the rapid development of the coal-fired power plants in China is increased year by year. Wherein the traditional fly ash slag becomes an important raw material in the production of cement and concrete, the resource utilization ratio is improved year by year, while the circulating fluidized bed sulfur fixation ash and slag are caused by the boiler combustion process (the temperature in the furnace is 800-9)00 ℃), a desulfurization process, low calorific value fuel, etc., and is quite different from the application of pulverized coal ash produced by a pulverized coal furnace. f-CaO generated by sulfur-fixing agent residue appears in sulfur-fixing ash and slag as II-CaSO4SO in the form of3And (4) fixing sulfur to obtain a product. These substances have low activity, can generate expansive substances such as ettringite, dihydrate gypsum and the like after hydration, can expand by more than 2 times in volume in the generation process, and can cause adverse effects on the water consumption per unit volume and the volume stability when added into concrete. In addition, the sulfur-fixing ash and the slag are of porous structures, so that the sulfur-fixing ash and the slag have great difference from the traditional fly ash in terms of physical characteristics and volcanic ash activity, and can have the defects of large water demand, large loss on ignition, quick slump loss and the like when being directly used in concrete. So that the cement and concrete are not easy to be mixed and used in the production of cement and concrete, and at present, no example of the large-scale comprehensive utilization of the circulating fluidized bed sulfur-fixing ash and slag exists. Finally, the stacking amount of the sulfur fixation ash and the slag in China is up to 1 hundred million tons every year, the traditional ash yard adopts rolling and stacking, a large amount of land is wasted, the transportation cost, the ash yard maintenance cost and the like also increase the economic burden of enterprises, and meanwhile, a serious environmental problem is brought.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a concrete admixture developed by the fluidized bed combustion ash and a preparation method thereof, wherein the shape and the fineness of the fluidized bed combustion ash are changed by wall breaking and shaping (grinding), so that the particle size distribution of the fluidized bed combustion ash is improved. Meanwhile, the pH value of the system is improved by adding an alkaline activator, so that components in the material are dissolved and recombined to form a new strength plate, thereby realizing the maximum blending of the concrete admixture developed by the solid sulfur ash in the concrete, solving the problem that the power plant ash and slag pile occupies the land, reducing the economic burden of enterprises, simultaneously realizing the large-scale and resource utilization of the solid wastes and turning waste into wealth.
The invention provides a preparation method of a concrete admixture developed by fluidized bed combustion ash slag, which comprises the following steps:
1) pretreatment: pretreating undisturbed sulfur fixation slag to obtain a pretreatment material 1;
2) alkali excitation: 1.0-1.5% of alkaline activator is added into the undisturbed sulfur fixation ash; simultaneously adding 1.0-1.5% of alkaline activator into the pretreatment material 1;
3) breaking walls and shaping (grinding): adding the undisturbed sulfur fixation ash added with 1.0-1.5% of the alkaline excitant into an ultrafine powder tube mill for grinding to prepare powder 1; adding the pretreatment material 1 added with 1.0-1.5% of the alkaline exciting agent into an ultrafine powder tube mill for grinding to prepare powder 2;
4) sorting: the powder 1 is sorted by a high-efficiency powder sorting machine, and when the specific surface area reaches 650-750m2In the case of/kg, the semi-finished product 1 is obtained; meanwhile, the powder 2 is sorted by a high-efficiency powder sorting machine, and when the specific surface area reaches 650-750m2In the case of/kg, the semi-finished product 2 is obtained;
5) homogenizing: and mixing the semi-finished product 1 and the semi-finished product 2 in proportion, and homogenizing to prepare a finished product, namely the ultra-fine concrete admixture for the fluidized bed combustion ash.
Further, the grain size of the pretreatment material 1 in the step (1) and the grain size of the undisturbed sulfur fixation ash in the step (2) are 25-300 μm, the average grain size is 40 μm, the porosity is about 70%, and the water demand is 130%.
Further, the average particle size of the finished product in the step (5) is less than 20 microns, the porosity is less than 55%, and the water demand is less than 95%.
Further, in step 5), the semi-finished products 1 and 2 are mixed according to the ratio of 6: and 4, mixing in proportion.
The invention also provides a concrete admixture developed by the fluidized bed combustion ash slag, which is prepared by any one of the preparation methods of the concrete admixture developed by the fluidized bed combustion ash slag.
Further, the concrete admixture developed by the fluidized bed combustion ash slag comprises the following components in percentage by weight: 59.4 percent of sulfur-fixing ash, 39.6 percent of sulfur-fixing slag and 1 percent of alkaline excitant.
Further, the specific surface area of the concrete admixture developed by the solid sulfur ash is 650-750m2/kg。
Furthermore, the concrete admixture developed by the solid sulfur clinker can replace cement with a rate of 40%.
The concrete admixture developed by the fluidized bed combustion ash slag is applied to the production of concrete.
Compared with the prior art, the technical scheme of the invention has the advantages that:
the concrete admixture developed by the solid sulfur ash provided by the invention has the advantages of low cost, large mixing amount, easily obtained raw materials and the like;
secondly, the main raw materials of the concrete admixture developed by the solid sulfur ash provided by the invention are the solid sulfur ash and the solid sulfur slag which are industrial solid wastes, and the admixture has certain economic benefit and good environmental protection benefit after being recycled;
the preparation method of the concrete admixture developed by the solid sulfur ash provided by the invention has the advantages that the solid sulfur ash and the slag are processed into a new product through a new method and a new process, so that the large-scale resource utilization of solid wastes is realized, the wastes in the production are converted into resources in the next production field, the purposes of saving land, reducing pollution, utilizing wastes and saving energy are achieved, and the unification of production benefits, environmental benefits, economic benefits and social benefits is finally realized;
④ the invention provides a method for preparing concrete admixture developed by sulfur-fixing ash, which comprises increasing pH value of the system by adding excitant, breaking wall and shaping the material in alkaline environment to expose calcium oxide, and utilizing II-CaSO in the sulfur-fixing ash4And the f-CaO and the components in the sulfur-fixing slag form complementation to promote the hydration of each other, promote the formation of hydrated calcium silicate gel and hydrated calcium aluminate gel, and achieve the purposes of improving the problems of sulfur-fixing ash, large slag water demand, high expansibility and the like; the excellent performance of each component is fully utilized, the performance defect of a single component is overcome, and the performance of the admixture is more excellent, so that the maximum blending of the admixture in concrete is realized;
the preparation method of the concrete admixture developed by the solid sulfur ash provided by the invention adopts the alkaline activator, has the advantages of small dosage, good effect and capability of dissolving and recombining silicon-aluminum components to form a new strength plate;
when the concrete admixture developed by the sulfur-fixing ash slag provided by the invention is applied to concrete production, the performance of fresh concrete can be improved, the strength index after hardening is improved, the hydration heat index of the concrete is reduced, and the probability of cracking of the concrete due to hydration heat is almost zero; the concrete quality and performance are improved, the consumption of cement and additives is reduced, the unit cost of the concrete is reduced, and the concrete has good social and economic benefits.
⑦ the concrete admixture developed by the solid sulfur ash provided by the invention mixes the semi-finished product 1 and the semi-finished product 2 according to the proportion of 6: 4, and can fully utilize the II-CaSO in the solid sulfur ash4And f-CaO, so that the components in the sulfur-fixing slag are complementary to each other, the hydration of the components is promoted, the formation of hydrated calcium silicate gel and hydrated calcium aluminate gel is promoted, and the problems of large water demand, high expansibility and the like of sulfur-fixing ash and slag are solved.
Drawings
FIG. 1 is a schematic flow chart of the preparation process of a concrete admixture developed from a fluidized bed combustion ash in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.
Example 1
A concrete admixture developed by the fluidized bed combustion ash and a preparation method thereof comprise the following steps (see the attached figure 1):
(1) pretreatment: pretreating undisturbed sulfur fixation slag from a power plant to obtain a pretreatment material 1;
(2) alkali excitation: conveying undisturbed solid sulfur ash from a power plant to a batching storehouse bucket elevator by air force, lifting the undisturbed solid sulfur ash into a batching storehouse by the bucket elevator, metering by a rotor scale at the bottom of the batching storehouse, and then adding 1.0-1.5% of an alkaline activator into the undisturbed solid sulfur ash through an activator storehouse 1; adding an alkaline exciting agent into the pretreatment material 1 through an exciting agent library 2 according to the proportion of 1.0-1.5%;
(3) wall breaking, shaping and sorting: adding the said 1.0-1.5% ofThe original solid sulfur ash of the alkaline excitant is sent into an ultrafine powder tube mill for grinding by a chute, the powder 1 is obtained after full grinding, the powder 1 is separated by a high-efficiency powder separator, the coarse powder is ground again by the chute back grinding, and the specific surface area of the fine powder reaches 650 plus 750m2The semi-finished product 1 enters a bag dust collector along with airflow and is collected, and then is conveyed to a semi-finished product warehouse 1 through a chute; feeding the pretreatment material 1 added with 1.0-1.5% of the alkaline exciting agent into an ultrafine powder tube mill for grinding by a chute, fully grinding to obtain powder 2, sorting the powder 2 by a high-efficiency powder selecting machine, grinding the coarse powder again by the chute back grinding, wherein the specific surface area of the fine powder reaches 650-750m2When the pressure is/kg, the semi-finished product 2 is obtained, and the semi-finished product 2 enters a bag dust collector along with airflow and is conveyed to a semi-finished product warehouse 2 through a chute after being collected;
(4) homogenizing: and (3) mixing the semi-finished product 1 and the semi-finished product 2 according to the ratio of 6: 4, mixing in proportion, and homogenizing to obtain a finished product, namely the ultra-fine concrete admixture of the fluidized bed combustion ash; and the admixture comprises the following components in percentage by weight: 59.4 percent of sulfur-fixing ash, 39.6 percent of sulfur-fixing slag and 1 percent of alkaline excitant.
Example 2
The concrete admixture developed by the fluidized bed combustion ash prepared in the embodiment 1 is used for preparing the concrete, and the performance of the prepared concrete is detected.
1. Grouping condition:
control group: c30 concrete is used as a control group, and the basic mixing proportion composition is shown in table 1;
experimental group: the concrete prepared by the concrete admixture developed by the solid sulfur ash prepared in the embodiment 1 is taken as an experimental group, and the composition of the mixture ratio is shown in the table 2;
TABLE 1 basic compounding ratio composition of control group
| P.0.42.5 cement | Water (W) | Medium sand | Crushing stone | Additive agent |
| 360kg | 160kg | 750kg | 1140kg | 9.0kg |
TABLE 2 composition of combination ratio of experimental groups
2. And (3) concrete performance detection:
the detection basis is as follows: the concrete is prepared from the following raw materials of GB/T50081-2002, and GB/T50082-2009, wherein the raw materials are as follows.
Firstly, detecting the concrete performance of a control group
a. Slump: initial 230mm, 180mm after 1 hour;
b.28 day compressive strength: maximum value 39.6Mpa, intermediate value 38.1 Mpa;
minimum value 37.7MPa, average value 38.5 MPa;
c. durability:
and (3) anti-permeability grade: p8 no penetration;
number of freeze-thaw cycles: f150;
modulus of elasticity: 86.7 percent;
weight loss: 4 percent;
d. volume stability: qualified (steam curing at 80 ℃ for 8 hours).
② concrete performance detection of experimental group
a. Slump: initial 240mm, 210mm after 1 hour;
b.28 day compressive strength: maximum value 54.9Mpa, middle value 51.5 Mpa;
minimum value 50.8MPa, average value 52.4 MPa;
c. durability:
and (3) anti-permeability grade: p8 no penetration;
number of freeze-thaw cycles: f150;
modulus of elasticity: 90.8 percent;
weight loss: 2.7 percent;
d. volume stability: qualified (steam curing at 80 ℃ for 8 hours).
3. Analysis of technical and economic benefits
Under the condition of the same water consumption, the slump loss is superior to the standard mixing proportion and the volume stability is qualified. The average value of the compressive strength is higher than 36% of the reference, and the durability is superior to the basic mixing ratio.
② the amount of cement replaced by concrete per cubic meter is 144kg, the price of the cement is 460 yuan/ton, the price of the clinker admixture is 200 yuan/ton, the difference price per kilogram is 0.26 yuan, and the direct economic benefit is 0.26 × 114 ═ 29.64 yuan/m3。
Note: the alkali activator used in the invention adopts volcanic ash-based powder material activator series patent product with the patent application number of 2019103269934.
It should be understood that the above-described specific embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Obvious variations or modifications which are within the spirit of the invention are possible within the scope of the invention.
Claims (9)
1. The preparation method of the concrete admixture developed by the fluidized bed combustion ash slag is characterized by comprising the following steps:
1) pretreatment: pretreating undisturbed sulfur fixation slag to obtain a pretreatment material 1;
2) alkali excitation: 1.0-1.5% of alkaline activator is added into the undisturbed sulfur fixation ash; simultaneously adding 1.0-1.5% of alkaline activator into the pretreatment material 1;
3) wall breaking and shaping: adding the undisturbed sulfur fixation ash added with 1.0-1.5% of the alkaline excitant into an ultrafine powder tube mill for grinding to prepare powder 1; adding the pretreatment material 1 added with 1.0-1.5% of the alkaline exciting agent into an ultrafine powder tube mill for grinding to prepare powder 2;
4) sorting: the powder 1 is sorted by a high-efficiency powder sorting machine, and when the specific surface area reaches 650-750m2In the case of/kg, the semi-finished product 1 is obtained; meanwhile, the powder 2 is sorted by a high-efficiency powder sorting machine, and when the specific surface area reaches 650-750m2In the case of/kg, the semi-finished product 2 is obtained;
5) homogenizing: and mixing the semi-finished product 1 and the semi-finished product 2 in proportion, and homogenizing to prepare a finished product, namely the concrete admixture developed by the solid sulfur clinker.
2. The preparation method of the concrete admixture developed by the fluidized bed combustion ash slag as claimed in claim 1, which is characterized in that: the grain size range of the raw solid sulfur ash in the pretreatment material 1 in the step 1) and the raw solid sulfur ash in the step 2) is 25-300 mu m, the average grain size is 40 mu m, the porosity is 70%, and the water demand is 130%.
3. The preparation method of the concrete admixture developed by the fluidized bed combustion ash slag as claimed in claim 1, which is characterized in that: the average grain diameter of the finished product in the step 5) is less than 20 mu m, the porosity is less than 55 percent, and the water demand is less than 95 percent.
4. The method for preparing the concrete admixture developed by the clinker according to claim 1, 2 or 3, which is characterized in that: in the step 5), the semi-finished products 1 and 2 are mixed according to the ratio of 6: and 4, mixing in proportion.
5. The concrete admixture developed by the fluidized bed combustion ash slag is characterized in that: the concrete admixture developed by the clinker is prepared by the preparation method of the concrete admixture developed by the clinker in any one of claims 1 to 4.
6. The concrete admixture developed by the fluidized bed combustion ash according to claim 5, which is characterized in that: the paint consists of the following components in percentage by weight: 59.4 percent of sulfur-fixing ash, 39.6 percent of sulfur-fixing slag and 1 percent of alkaline excitant.
7. The concrete admixture developed by the fluidized bed combustion ash according to claim 5, which is characterized in that: the specific surface area of the admixture is 650-750m2/kg。
8. The concrete admixture developed by the fluidized bed combustion ash according to claim 5, which is characterized in that: the cement-replacing rate of the admixture can reach 40%.
9. Use of an admixture according to any one of claims 5 to 7 in concrete.
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| CN201910651708.6A CN110407496A (en) | 2019-07-18 | 2019-07-18 | A kind of concrete admixture and preparation method thereof of fluidized bed combustion coal ash/slag development |
| CN2019106517086 | 2019-07-18 |
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