KR20110091169A - Method for manufactruing cement using fly ash and water sludge - Google Patents
Method for manufactruing cement using fly ash and water sludge Download PDFInfo
- Publication number
- KR20110091169A KR20110091169A KR1020100010878A KR20100010878A KR20110091169A KR 20110091169 A KR20110091169 A KR 20110091169A KR 1020100010878 A KR1020100010878 A KR 1020100010878A KR 20100010878 A KR20100010878 A KR 20100010878A KR 20110091169 A KR20110091169 A KR 20110091169A
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- KR
- South Korea
- Prior art keywords
- cement
- fly ash
- weight
- clinker
- sludge
- Prior art date
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/16—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
Abstract
The present invention relates to a method of manufacturing cement using fly ash and purified sludge, and more particularly, to prepare a clinker by mixing limestone powder and purified sludge in a fly ash from which noxious substances have been removed, and then firing the clinker. It relates to a method of manufacturing cement by mixing gypsum into.
The method of manufacturing cement according to the present invention not only can reduce environmental pollution and reduce cement production costs by recycling fly ash and purified water sludge during cement production, but also removes heavy metals and dioxins which are harmful substances contained in fly ash to the human body. It has the effect of producing a safer cement.
Description
The present invention relates to a method of manufacturing cement using fly ash and purified sludge, and more particularly, to prepare a clinker by mixing limestone powder and purified sludge in a fly ash from which noxious substances have been removed, and then firing the clinker. It relates to a method of manufacturing cement by mixing gypsum into.
As industrial activities progress rapidly, a large amount of household wastes, water and sewage sludge, and industrial wastes are generated. These industrial wastes are a major cause of environmental pollution, and their treatment methods and costs are emerging as social problems.
Purified sludge is sludge which is produced through filtration and sedimentation of raw water drawn from water intake pipe and water well in the water purification process. It is low in organic matter and mainly composed of turbidity and aluminum hydroxide. It may contain -30%. Similar to sewage sludge, it has a moisture content of 98% or more, making treatment and disposal difficult.
In general, most of ash is generated from thermal power plants, and is generated by combustion processes in sites such as waste incinerators and cogeneration plants. Ash is a recyclable inorganic material such as SiO 2 , Al 2 O 3 , Fe 2 O 3 , but it is difficult to apply because it contains the coal briquettes. These ashes are classified into fly ash, cinder ash, and bottom ash according to the occurrence place. However, fly ash contains toxic substances such as dioxins and requires special care when recycling them. Recently, fly ash treatment methods include melting, solidification / stabilization, and acid extraction. Various methods have been studied, such as vitrification and sintering.
Cement is a process for producing new mineral and cement semi-linked clinker by inducing chemical change by applying high temperature heat with bituminous coal to raw materials mixed with natural limestone, clay, silica and iron ore. Mixing / crushing gypsum as a coagulant retardant to the clinker gives the final product cement. Since the 1990s, instead of natural resources, slag, coal ash, sludge, steelmaking slag, etc. have been used as substitute raw materials. Waste tires, synthetic resins, refined oils, and waste wood have been used as auxiliary fuels by replacing bituminous coal. In addition, slag, fly ash, desulfurized gypsum and the like are used as a substitute material when crushing the clinker.
Conventionally, Korean Patent Publication No. 2004-0093527 (insulation cement composition), Korean Patent Publication No. 2004-0093526 (fly ash containing cement composition), Korean Patent Publication No. 2002-0071130 (cement admixture composition using fly ash), etc. Although a composition for preparing cement using silver fly ash has been disclosed, there is a problem in that it is not safe for the human body to be used without removing harmful substances contained in the fly ash.
Therefore, the present inventors have tried to solve the above problems, as a result of mixing the lime ash powder and purified water sludge in the fly ash purified by the activated carbon and heat treatment to the harmful substances such as dioxins and heavy metals in the fly ash, here, Cement prepared by mixing gypsum was confirmed to be safe for the human body to complete the present invention.
An object of the present invention is to provide a method of manufacturing cement using fly ash and purified water sludge from which noxious substances have been removed.
The present invention comprises the steps of: (a) mixing 100% by weight of fly ash, limestone powder 20-50% by weight, purified water sludge 5-10% by weight; (b) calcining the mixture to produce a clinker, and (c) mixing gypsum with the clinker to produce cement.
The method of manufacturing cement according to the present invention not only can reduce environmental pollution and reduce cement production costs by recycling fly ash and purified water sludge during cement production, but also removes heavy metals and dioxins which are harmful substances contained in fly ash to the human body. It has the effect of producing a safer cement.
Figure 1 shows a process of the cement manufacturing method according to the present invention.
The present invention, in one aspect, (a) 100% by weight of the fly ash, mixing limestone powder 20-50% by weight, purified water sludge 5-10% by weight; (b) calcining the mixture to produce a clinker, and (c) mixing gypsum with the clinker to produce cement.
In general, the manufacture of cement requires a raw material containing the main chemical components of calcium (CaO), silica (SiO 2 ), alumina (Al 2 O 3 ), iron oxide (Fe 2 O 3 ), such a raw material When the raw materials are mixed and pulverized to produce a raw powder, and put into a high-temperature rotary kiln, the raw materials undergo a chemical reaction to change into a compound having hydraulic properties required as cement.
In the present invention, fly ash refers to coal ash collected by a dust collector from flue gas of a boiler for burning pulverized coal, and includes industrial sites such as thermal power plants, waste incinerators, and cogeneration plants. Alumina (Al 2 O 3 ) and silica (SiO 2 ) are the main components, and are used as raw materials for fly ash cement. The chemical composition of fly ash is as follows.
ash
In this case, the fly ash contains harmful substances such as dioxins and heavy metals. To remove them, first, by injecting activated carbon into a boiler in which dioxins are mainly produced, the production of dioxins is suppressed in advance to prevent not only fly ash but also exhaust gases. After reducing the dioxin concentration in the furnace, the fly ash is heated to about 500 to 700 ° C. in a heating furnace to completely burn the dioxins and heavy metals contained in the fly ash. Since the boiling point of dioxins is 300 to 500 ° C, most of the dioxins contained in the fly ash are volatilized by the heat treatment.
In the present invention, the main component of the limestone powder is CaCO 3 and is used as the main raw material of cement. In general, the amount of calcium oxide (CaO) that can be contained in the clinker is 65 ~ 67%, occupies an important position in the cement raw material, the compressive strength of limestone is less than 950kg / cm 2 has a small impact on the crushability, CaCO 3 Should be at least 85%.
Limestone powder in the present invention is contained in 20 to 50% by weight, when contained in less than 20% by weight, there is a problem that the fluidity is lowered when mixed with other compositions, when contained in excess of 50% by weight, strength expression is lowered There is a problem.
In the present invention, the purified sludge is sludge generated in the purified water process, and impurities are washed in water through the purified water process such as the acid treatment process and the alkali treatment process so that there is no concern about environmental pollution, and it is used for the cement composition of the present invention. Suitable. The chemical composition of the purified sludge is as follows.
At this time, the purified sludge is characterized by mixing 5 to 10% by weight with respect to 100% by weight of the fly ash, if less than 5% by weight, there is a problem that the fluidity is lowered, if more than 10% by weight There is a problem that the strength is lowered.
In the present invention, the mixture of step (a) may be ground to a particle size of 50 ~ 100㎛ for uniform mixing.
In addition, the firing of step (b) may be characterized in that carried out at a temperature of 1200 ~ 1400 ℃ in the kiln.
In the present invention, when the hydration reaction is carried out by pulverizing only the clinker prepared by calcining the mixture of step (a), the condensation proceeds rapidly. Thus, gypsum (CaSO 4 · 2H 2 O) is added to the clinker to pulverize and cure it. Adjust speed, improve initial strength and stability. At this time, the gypsum is characterized in that 5 to 20% by weight with respect to 100% by weight of the fly ash, if less than 5% by weight, there is a problem that the strength of the cement is lowered, exceeding 20% by weight If mixed, there is a problem that the curing rate is delayed.
Hereinafter, the present invention will be described in more detail with reference to examples. It is to be understood by those skilled in the art that these examples are for illustrative purposes only and that the scope of the present invention is not construed as being limited by these examples.
Removal of harmful substances from fly ash
First, the residual concentration of dioxins and heavy metals of fly ash discharged from the incinerator and not treated with harmful substances was measured.
Apart from the above, the fly ash discharged from the incinerator treated with activated carbon was charged to a heating furnace to heat the fly ash. Activated charcoal and heat-treated fly ash was collected, and the residual concentrations of dioxins and heavy metals were measured and shown in Table 3 below.
(unit)
density
(pg-iTEQ / g)
Pb
(ppm)
As
(ppm)
CD
(ppm)
Cu
(ppm)
Hg
(ppm)
11.5
57.8
2.1
0.5
0.8
0.003
0.25
0.02
0.0004
0.03
0.007
0.0001
As a result, the fly ash, which has undergone the two-step removal of harmful substances of activated carbon and heat treatment according to the present invention, has a high removal rate of dioxins and heavy metals, and has been found to be safer to a human body than conventional fly ashes.
Preparation of Cement According to the Invention
In Example 1, 100 parts by weight of the fly ash, which had been subjected to the step 2 of removing the harmful substances, 35 parts by weight of limestone powder and 10 parts by weight of purified water sludge were pulverized to 50 µm for uniform mixing, and then mixed and mixed in a firing furnace at 1200 ° C. The clinker was prepared by firing and maintaining at a firing temperature for 1 hour and then air cooling. Thereafter, 10 parts by weight of gypsum was mixed with the clinker to prepare a cement finished product.
Having described the specific parts of the invention in detail, it will be apparent to those skilled in the art that these specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. . Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.
Claims (5)
(a) mixing 20-50% by weight of limestone powder and 5-10% by weight of purified sludge with respect to 100% by weight of the fly ash;
(b) calcining the mixture to produce a clinker.
(c) mixing cement with the clinker to produce cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100010878A KR20110091169A (en) | 2010-02-05 | 2010-02-05 | Method for manufactruing cement using fly ash and water sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100010878A KR20110091169A (en) | 2010-02-05 | 2010-02-05 | Method for manufactruing cement using fly ash and water sludge |
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| Publication Number | Publication Date |
|---|---|
| KR20110091169A true KR20110091169A (en) | 2011-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020100010878A KR20110091169A (en) | 2010-02-05 | 2010-02-05 | Method for manufactruing cement using fly ash and water sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109437621A (en) * | 2018-12-13 | 2019-03-08 | 河北曲寨矿峰水泥股份有限公司 | A kind of environment friendly silicon acid salt cement and preparation method thereof |
| CN109503020A (en) * | 2018-12-13 | 2019-03-22 | 河北曲寨矿峰水泥股份有限公司 | A kind of modified additive and preparation method thereof for portland cement |
-
2010
- 2010-02-05 KR KR1020100010878A patent/KR20110091169A/en active Search and Examination
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109437621A (en) * | 2018-12-13 | 2019-03-08 | 河北曲寨矿峰水泥股份有限公司 | A kind of environment friendly silicon acid salt cement and preparation method thereof |
| CN109503020A (en) * | 2018-12-13 | 2019-03-22 | 河北曲寨矿峰水泥股份有限公司 | A kind of modified additive and preparation method thereof for portland cement |
| CN109437621B (en) * | 2018-12-13 | 2020-12-15 | 河北曲寨矿峰水泥股份有限公司 | Environment-friendly portland cement and preparation method thereof |
| CN109503020B (en) * | 2018-12-13 | 2021-02-26 | 河北曲寨矿峰水泥股份有限公司 | Modifying assistant for portland cement and preparation method thereof |
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