CN111689710A - Method for producing fly ash by utilizing stone cutting solid waste - Google Patents
Method for producing fly ash by utilizing stone cutting solid waste Download PDFInfo
- Publication number
- CN111689710A CN111689710A CN202010612790.4A CN202010612790A CN111689710A CN 111689710 A CN111689710 A CN 111689710A CN 202010612790 A CN202010612790 A CN 202010612790A CN 111689710 A CN111689710 A CN 111689710A
- Authority
- CN
- China
- Prior art keywords
- solid waste
- stone cutting
- fly ash
- stone
- black
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a method for producing fly ash by utilizing stone cutting solid waste, which comprises the following steps: s1: adding coal gangue with the particle size of 2-4 cm into stone cutting solid waste, wherein the mass ratio of the coal gangue to the stone cutting solid waste is 0.08-0.12: 1, mixing and stirring uniformly, and then calcining at 850-1000 ℃ until the water content of the material is reduced to be below 3%, so as to obtain a calcined material; s2, adding slag into the calcined material, wherein the mass ratio of the slag to the stone cutting solid waste is 0.02-0.08: 1, and then mixing and grinding the materials until the materials can pass through a 325-mesh sieve. The advantages are that: 1) provides a new stone cutting solid waste recycling way; 2) the prepared fly ash product completely meets the quality standard of the second-level fly ash of the concrete admixture material of national legal detection standard, and realizes the resource utilization of solid waste of stone cutting.
Description
Technical Field
The invention relates to a stone cutting process, in particular to a stone cutting solid waste treatment method.
Background
After being cut from a quarry (the stones are generally about several tons in weight), the stones are conveyed to a workshop and cut into finished plates with required shapes or specifications through a hydraulic stone cutting machine, and the finished plates can be used as wall bricks or floor tiles to be laid on the outer walls or the ground of buildings. Hydraulic pressure building stones cutting machine when carrying out the blank, can last to the blade bath, the purpose is: on one hand, cooling the blade of the hydraulic stone cutter; on the other hand, cutting stone generates a large amount of fine fly ash, which affects air quality by diffusing into the air, and furthermore, the fly ash is seriously harmful to health by breathing into the air by an operator, so that another purpose of flushing water is to prevent flying ash. The fly ash and water are mixed and then enter a slurry pool for temporary storage, and then are pumped to a stone slurry filter press through a pump to complete solid-liquid separation, so that reclaimed water and solid waste with the water content of about 20 percent are obtained, and the solid waste is the stone material cutting solid waste.
Wherein the reuse water is reused for flushing the stone cutting machine; the stone cutting solid waste cannot be directly discharged because the stone cutting solid waste does not conform to the relevant regulations of the national environmental protection law; in addition, since the stone cuttings solid waste particles are too fine, their use as building materials affects the strength of buildings and thus they cannot be used as building materials; and if the landfill also affects the soil looseness, water and soil loss can be caused. The existing treatment method can only carry out open-air stockpiling, not only needs to pay tax of 25 yuan/ton to the country according to the regulation, but also seriously occupies land resources and causes damage to the environment.
The fly ash can be used as a mixing material of mortar or concrete, and the fly ash is mixed in the concrete to replace partial cement or fine aggregate, so that the cost can be reduced, the workability of the concrete can be improved, the water and gas impermeability, the sulfate resistance and the chemical corrosion resistance can be improved, the hydration heat can be reduced, the high temperature resistance of the concrete can be improved, the particle separation and water precipitation phenomena can be reduced, the shrinkage and cracking of the concrete can be reduced, and the corrosion of stray current to reinforcing steel bars in the concrete can be inhibited. The national standard second grade high quality fly ash is particularly suitable for preparing pump concrete, large-volume concrete, impervious structural concrete, sulfate-resistant concrete and soft water erosion-resistant concrete, underground and underwater engineering concrete, mud jacking concrete and roller compacted concrete.
Disclosure of Invention
In order to solve the problem that solid waste of stone material cutting is difficult to treat, the invention provides a method for producing fly ash by utilizing the solid waste of stone material cutting.
The technical scheme adopted by the invention is as follows: the method for producing fly ash by utilizing stone cutting solid waste comprises the following steps:
s1: adding coal gangue with the particle size of 2-4 cm into stone cutting solid waste, wherein the mass ratio of the coal gangue to the stone cutting solid waste is 0.08-0.12: 1, mixing and stirring uniformly, and then calcining at 850-1000 ℃ until the water content of the material is reduced to be below 3%, so as to obtain a calcined material;
s2, adding slag into the calcined material, wherein the mass ratio of the slag to the stone cutting solid waste is 0.02-0.08: 1, and then mixing and grinding the materials until the materials can pass through a 325-mesh sieve, thus obtaining the stone cutting solid waste.
The solid waste of the stone cutting contains metal ions such as iron, silicon, aluminum, manganese and the like, while the second-level fly ash specified by the state does not allow the metal ions to appear, and the solid waste of the stone cutting has higher content of C, so the solid waste of the stone cutting has more brittle physical properties. The high-temperature calcination can remove metal ions contained in the solid waste of stone cutting, and simultaneously change the physical properties of the solid waste of stone cutting, so that the physical properties of the solid waste of stone cutting after combustion are changed into inertia, the loss on ignition is reduced, and the strength is further improved.
However, due to the limitation of the properties of the raw materials, the strength of the powder produced by directly calcining the solid waste of stone cutting is still low, and the strength requirement of the secondary fly ash cannot be met, and the color of the calcined powder is pink, so that the fly ash produced in the later stage cannot meet the requirement of building materials.
Aiming at the problems, the coal gangue with the particle size of 2-4 cm is added into the stone cutting solid waste, the mass ratio of the coal gangue to the stone cutting solid waste is 0.08-0.12: 1, the coal gangue and the stone cutting solid waste are uniformly mixed and stirred and then are jointly calcined, and experiments show that the scheme can obviously increase the strength of a calcined product, and the color of the calcined material can be changed into brown to blackbrown, so that the product meets the quality requirement of secondary fly ash.
Meanwhile, because the material after high-temperature calcination is inert, the invention plays a role in improving the activity of the material by adding the slag after calcination.
It can be understood by those skilled in the art that the slag of the present invention, also called as slag, is a melt floating on the surface of liquid materials such as metals generated in pyrometallurgical process, and the composition of the melt is mainly oxides (silica, alumina, calcium oxide, magnesium oxide).
As a further improvement of the invention, the stone cutting solid waste is stone cutting solid waste generated in cutting black granite stones.
More preferably, the black granite stone is selected from Chinese black, Sichuan black, Yibin black and sesame black, and can replace one of Mongolian black, Fuding black and Fengshen black.
The invention has the beneficial effects that: 1) provides a new stone cutting solid waste recycling way; 2) the prepared fly ash product completely meets the quality standard of the second-level fly ash of the concrete admixture material of national legal detection standard, and realizes the resource utilization of stone cutting solid waste; taking a certain factory as an example, the land occupation is 140 mu, 20 workshops are provided, each workshop is provided with a hydraulic cutting machine, and then two slurry filter presses are arranged. 3000 tons of plates are produced every day, about 15 percent of stone cutting solid waste is generated, the method changes waste into valuable, 11250 yuan of pollution discharge tax can be saved every year, about 9 ten thousand yuan of coal ash sales profit is increased, which is equivalent to 10 ten thousand yuan of economic profit every year, and more importantly, the problem of environmental pollution caused by stone cutting solid waste is thoroughly solved.
Detailed Description
The present invention will be further described with reference to the following examples.
The first embodiment is as follows:
the method for producing fly ash by utilizing stone cutting solid waste comprises the following steps:
the black granite stone adopted by the embodiment is Sichuan black.
(1) Adding coal gangue with the particle size of 2-4 cm into the stone cutting solid waste, wherein the mass ratio of the coal gangue to the stone cutting solid waste is 0.1:1, mixing and stirring uniformly, calcining at 950 ℃, and stopping calcining until the water content of the material is reduced to 3% to obtain a calcined material.
(2) Adding slag into the calcined material, wherein the mass ratio of the slag to the stone cutting solid waste is 0.06:1, and then mixing and grinding the materials until the materials can pass through a 325-mesh sieve, thus obtaining a fly ash product.
(3) The performance of the obtained fly ash product is detected according to the GB/T1596-2005 + test method, and the result is shown in Table 1.
Example two:
the method for producing fly ash by utilizing stone cutting solid waste comprises the following steps:
the black granite stone adopted in the embodiment is Yibin black.
(1) Adding coal gangue with the particle size of 2-4 cm into the stone cutting solid waste, wherein the mass ratio of the coal gangue to the stone cutting solid waste is 0.08:1, mixing and stirring uniformly, calcining at 1000 ℃, and stopping calcining until the water content of the material is reduced to 3% to obtain a calcined material.
(2) Adding slag into the calcined material, wherein the mass ratio of the slag to the stone cutting solid waste is 0.08:1, and then mixing and grinding the materials until the materials can pass through a 325-mesh sieve, thus obtaining a fly ash product.
(3) The performance of the obtained fly ash product is detected according to the GB/T1596-2005 + test method, and the result is shown in Table 1.
Example three:
the method for producing fly ash by utilizing stone cutting solid waste comprises the following steps:
the black granite stone adopted by the embodiment is rich, town black.
(1) Adding coal gangue with the particle size of 2-4 cm into the stone cutting solid waste, wherein the mass ratio of the coal gangue to the stone cutting solid waste is 0.12:1, mixing and stirring uniformly, and calcining at 850 ℃ until the water content of the material is reduced to 3%, and stopping calcining to obtain a calcined material.
(2) Adding slag into the calcined material, wherein the mass ratio of the slag to the stone cutting solid waste is 0.02:1, and then mixing and grinding the materials until the materials can pass through a 325-mesh sieve, thus obtaining a fly ash product.
(3) The performance of the obtained fly ash product is detected according to the GB/T1596-2005 + test method, and the result is shown in Table 1.
Comparative example one:
this comparative example is a control experiment of example one, designed according to the same experimental conditions as example one, and differs only in that: no coal gangue is added in the step (1).
The performance of the obtained fly ash product is detected according to the GB/T1596-2005 + test method, and the result is shown in Table 1.
TABLE 1 fly ash product Performance test results
As can be seen from Table 1, the parameters detected by the samples in the embodiment of the invention all meet the requirement of class II in GB/T1596-.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The method for producing fly ash by utilizing stone cutting solid waste comprises the following steps:
s1: adding coal gangue with the particle size of 2-4 cm into stone cutting solid waste, wherein the mass ratio of the coal gangue to the stone cutting solid waste is 0.08-0.12: 1, mixing and stirring uniformly, and then calcining at 850-1000 ℃ until the water content of the material is reduced to be below 3%, so as to obtain a calcined material;
s2: adding slag into the calcined material, wherein the mass ratio of the slag to the stone cutting solid waste is 0.02-0.08: 1, and then mixing and grinding the materials until the materials can pass through a 325-mesh sieve, thus obtaining the stone cutting solid waste.
2. The method for producing fly ash by using stone cuttings solid waste as claimed in claim 1, wherein: the stone cutting solid waste is stone cutting solid waste generated in cutting black granite stones.
3. The method for producing fly ash by using stone cuttings solid waste as claimed in claim 2, wherein: the black granite stone is selected from Chinese black, Sichuan black, Yibin black and sesame black, and can replace one of Mongolian black, Fuding black and Fengshen black.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010612790.4A CN111689710A (en) | 2020-06-30 | 2020-06-30 | Method for producing fly ash by utilizing stone cutting solid waste |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010612790.4A CN111689710A (en) | 2020-06-30 | 2020-06-30 | Method for producing fly ash by utilizing stone cutting solid waste |
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| CN111689710A true CN111689710A (en) | 2020-09-22 |
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| CN202010612790.4A Pending CN111689710A (en) | 2020-06-30 | 2020-06-30 | Method for producing fly ash by utilizing stone cutting solid waste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113307526A (en) * | 2021-06-15 | 2021-08-27 | 吴兵 | Method for producing fly ash by utilizing stone cutting solid waste |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113307526A (en) * | 2021-06-15 | 2021-08-27 | 吴兵 | Method for producing fly ash by utilizing stone cutting solid waste |
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Application publication date: 20200922 |