Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
  • B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
  • B02C17/14—Mills in which the charge to be ground is turned over by movements of the container other than by rotating, e.g. by swinging, vibrating, tilting
• • 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
  • C04B18/10—Burned or pyrolised refuse
• • 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
  • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
• • 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
  • C04B28/02—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 hydraulic cements other than calcium sulfates
• • 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
  • C04B28/02—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 hydraulic cements other than calcium sulfates
  • C04B28/08—Slag cements
• • 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
  • C04B7/24—Cements from oil shales, residues or waste other than slag
  • C04B7/28—Cements from oil shales, residues or waste other than slag from combustion residues, e.g. ashes or slags from waste incineration
• • 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
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P40/00—Technologies relating to the processing of minerals
  • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
• • 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

Definitions

• the present invention relates to a method for producing coal ash, coal ash, and a cement composition.
• Viscous soil has a very small particle size and is solidified, so it is not easy to mix and agitate with solidified material in improving the ground.
• a special stirring device is used, the water ratio is increased in order to improve the uniformity with the solidified material, or the dispersant acting on the soil particles is used in combination with the solidified milk. The method is taken.
• Patent Documents 1 to 3 have problems in that new equipment is required, running cost is high, and classification efficiency is low.
• an additive such as coal ash is mixed with the solidified material and its effective use can be achieved, the amount of solidified material can be reduced, and cost reduction such as a reduction in the amount of sludge can be expected.
• the object to be treated is soil such as viscous soil, as already mentioned, mixing and stirring with the solidifying material is not easy, so the currently known solidifying materials have problems such as cost increase and low efficiency. There is. From the viewpoint of effective use of coal ash, it is preferable that all of this can be used. In addition, it is very significant if it is possible to improve the homogeneity at the time of mixing in the improvement of the viscous ground by simple treatment without requiring treatment such as removal of unburned carbon, but such technology is currently known. Not.
• the present invention can use coal ash with a large amount of unburned carbon without performing treatment by classification, coal ash that can improve uniformity during mixing in ground improvement of viscous soil, and a method for producing the same, and
• An object is to provide a cement composition using the coal ash.
• the present inventor has pulverized coal ash having a high ignition loss by pulverizing it within a predetermined range. It was found that the obtained coal ash can improve the uniformity at the time of mixing in the soil improvement of cohesive soil and arrived at the present invention. That is, the present invention is as follows.
• [3] Coal ash before pulverization
• the particle size of 45 ⁇ m or more measured by the above measurement method of coal ash after pulverization with respect to the content (Vp) of particles having a particle size of 45 ⁇ m or more measured by laser diffraction scattering type particle size distribution measurement method The method for producing coal ash according to [1] or [2], wherein the pulverization is performed so that the particle content (Vg) ratio (Vg / Vp) is 0.85 or less.
• the ignition loss is 3.5% by mass or more, the content of particles having a particle size of 45 ⁇ m or more measured by a laser diffraction / scattering particle size distribution measurement method is 20% by volume or more and 45% by volume or less, and the brain ratio
• Coal ash according to [4] in which the loss on ignition is 8.0% by mass or less.
• a cement composition comprising the coal ash according to [4] or [5] and cement.
• the cement composition according to [6] wherein the cement is at least one cement selected from the group consisting of ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, and low heat Portland cement.
• coal ash containing a large amount of unburned carbon can be used without being treated by classification, coal ash that can improve uniformity during mixing in ground improvement of viscous soil, a method for producing the same, and A cement composition using the coal ash can be provided.
• a cement composition using the coal ash can be provided.
• Coal ash production method In the method for producing coal ash according to the embodiment of the present invention, the lightness (Lg) of coal ash after pulverization is compared with the lightness (Lp value) of coal ash before pulverization. Pulverization so that the ratio (Lg / Lp) is 0.9 or less.
• the present invention provides a coal ash that can improve the mixability with viscous soil when it is used for ground improvement of cohesive soil after predetermined pulverization of coal ash having a large loss on ignition of 3.5% by mass or more.
• Quality coal ash is proportional to the amount of unburned carbon in the coal ash, and “the ignition loss is 3.5 mass% or more larger” indicates that there is a large amount of so-called unburned carbon. Then, by subjecting the coal ash having a large loss on ignition to predetermined pulverization, at least a part of the unburned carbon contained in the coal ash particles is exposed to the surface side of the particles, thereby It can be used to improve the mixing of cement particles and clay particles.
• the unburned carbon exposed on the surface of the coal ash particles by pulverization shows the same properties as the unburned carbon in the powder particles existing before pulverization, and the properties are hydrophobic. That is, the predetermined pulverization increases the amount of unburned carbon exposed on the surface of the coal ash particles as compared to before pulverization, and thus the hydrophobicity becomes stronger.
• the predetermined pulverization increases the amount of unburned carbon exposed on the surface of the coal ash particles as compared to before pulverization, and thus the hydrophobicity becomes stronger.
• cement and this coal ash are mixed and used as a solidifying material, excessive water absorption is not shown at the time of cement kneading due to the hydrophobic unburned carbon exposed on the surface of the particles, and the water content is high.
• the dispersibility of clay particles and cement particles can be improved efficiently in the ground improvement of cohesive soil.
• the ignition loss of coal ash is related to the content of unburned carbon, and when the ignition loss is large, it can be assumed that the content of unburned carbon contained in the coal ash is also large. Therefore, if the ignition loss of coal ash is less than 3.5% by mass, the absolute amount of unburned carbon that exhibits hydrophobicity decreases, and thus the dispersibility of the clay particles cannot be improved.
• the ignition loss of coal ash is preferably 3.5% by mass or more and 9.0% by mass or less, and more preferably 6.0% by mass or more and 9.0% by mass or less. The ignition loss can be measured by the method described in Examples described later.
• Coal ash having a loss on ignition of 3.5% by mass or more is, for example, ash generated from a coal-fired power plant and generated by pulverized coal combustion.
• coal ash coal ash dropped from the combustion gas of the combustion boiler when passing through an air regenerator or coal saver, coal ash collected by an electric dust collector, coal ash dropped on the furnace bottom of the combustion boiler Etc.
• the ratio (Lg / Lp) of the lightness (Lg value) of the coal ash after pulverization to the lightness (Lp value) of the coal ash before pulverization of the coal ash whose ignition loss is 3.5% by mass or more is 0.9. It grind
• a pulverizer a ball mill, a vibration mill (which imparts vibration to the container and transmits vibration to the medium (ball or rod) inside the container to make the powder finer) can be used.
• the lightness (Lp value) of the coal ash before pulverization is measured, and the ratio (Lg / Lp) between this and the lightness (Lg value) of the coal ash after pulverization is 0.9 or less.
• the coal ash to be pulverized the entire amount of coal ash to be used may be pulverized, or a part of the coal ash may be pulverized. Further, the pulverized coal ash may be mixed with unpulverized coal ash and used as pulverized coal ash.
• the pulverized coal ash is obtained by pulverizing a part of the coal ash and mixing the pulverized coal ash, the lightness (Lp value) of the coal ash before pulverization and the pulverized coal containing the pulverized coal ash What is necessary is just to grind
• the brightness of the coal ash is related to the blackness, and is mainly an indicator of the amount of unburned carbon exposed on the surface. If the Lg / Lp ratio before and after pulverization exceeds 0.9, it is included.
• Lg / Lp is preferably 0.6 or more and 0.9 or less, and more preferably 0.6 or more and 0.85 or less. By setting it to 0.6 or more, pulverization of the spherical particles can be suppressed as much as possible to suppress a decrease in fluidity.
• the brightness of the coal ash can be determined by measuring by the method described in the examples described later.
• many particles with a particle size of 45 ⁇ m or more are non-spherical, and from the viewpoint of improving the fluidity by pulverizing them and exposing the spherical particles to be included, it is possible to improve the fluidity of the coal ash before pulverization.
• the ratio (Vg / Vp) is more preferably pulverized so as to be 0.6 or more and 0.80 or less.
• the coal ash may be used as pulverized coal ash by pulverizing particles having a particle size of 45 ⁇ m or more and mixing the pulverized coal ash with unpulverized coal ash.
• coal ash that can easily improve the dispersibility of clay particles by predetermined grinding is obtained.
• Coal ash The coal ash of the embodiment of the present invention has an ignition loss of 3.5% by mass or more, and the content of particles having a particle size of 45 ⁇ m or more measured by a laser diffraction scattering type particle size distribution measuring method is 20% by volume or more and 45% by volume. %,
• the specific surface area of branes is 3200 to 4200 cm 2 / g, and the lightness (Lg value) is 25.0 to 50.0.
• the ratio (Lg / Lp) of the lightness (Lg value) of the pulverized coal ash to the (value) is 0.9 or less.
• the ignition loss of coal ash is preferably 3.5% by mass or more and 9.0% by mass or less, and more preferably 6.0% by mass or more and 9.0% by mass or less.
• the content of particles having a particle size of 45 ⁇ m or more is preferably 20% by volume or more and 45% by volume or less, and more preferably 23% by volume or more and 43% by volume or less.
• the specific surface area of the brane is preferably 3200 to 4200 cm 2 / g, and more preferably 3300 to 4000 cm 2 / g.
• the lightness (Lg value) of the pulverized coal ash is less than 25.0, there is a lot of unburned carbon and blackness increases, resulting in a difference in color between the surrounding ground and the ground when improving the ground. In other words, if it exceeds 50.0, the amount of unburned carbon released is small, and when mixed with viscous soil, good fluidity cannot be obtained, and it may not be possible to mix uniformly.
• the brightness of the coal ash is preferably 30.0 to 50.0, and more preferably 35.0 to 45.0.
• the ratio is preferably 0.6 or more and 0.9 or less, and more preferably 0.6 or more and 0.85 or less.
• the coal ash according to the embodiment of the present invention can be produced by the method for producing coal ash according to the embodiment of the present invention.
• the coal ash production of the embodiment of the present invention is performed using a pulverizer such as a ball mill, a disk mill, etc., and the particle size distribution, the brain specific surface area, and the color difference measurement are performed each time, and a predetermined physical property value is obtained. It is preferable to confirm.
• the coal ash according to the embodiment of the present invention is preferably used as a cement composition to be described later, but can be applied to various other uses by making use of its characteristics.
• the cement composition of the embodiment of the present invention includes the coal ash of the embodiment of the present invention and cement.
• the type of cement is not particularly limited, and is preferably at least one selected from the group consisting of ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, and low heat Portland cement.
• the content of coal ash with respect to the total amount of the cement composition is preferably more than 5% by mass and 40% by mass or less. It can be used as a solidifying material by exceeding 5 mass% and 40 mass% or less. The content is more preferably 25% by mass or more and 35% by mass or less.
• gypsum, blast furnace slag, limestone powder, quicklime and the like can also be mixed in the cement composition.
• a V-type mixer, a rocking-type mixer, a pan-type mixer, a rotation / revolution mixer, or the like can be used.
• the cement composition of the embodiment of the present invention is preferably provided as a cement-based solidifying material, and more preferably as a cement-based solidifying material for improving the ground of cohesive soil.
• the water used for kneading may be 80 to 120 parts by mass with respect to 100 parts by mass of the cement composition.
• the amount is 85 to 110 parts by mass.
• the coal ash properties were determined as follows. (1) Loss on ignition: JISA6201: It calculated
• Vp Content (volume%) of particles having a particle size of 45 ⁇ m or more measured by laser diffraction scattering type particle size distribution measurement method of coal ash before pulverization and laser diffraction scattering type particle size distribution measurement method of coal ash after pulverization From the measured content (Vg) (volume%) of particles having a particle size of 45 ⁇ m or more, the content (Vp) of particles having a particle size of 45 ⁇ m or more measured by the laser diffraction scattering type particle size distribution measurement method of coal ash before pulverization.
• composition test according to Examples and Comparative Examples 30 g of each of the pulverized coal ash A to F, 70 g of cement (ordinary Portland cement manufactured by Sumitomo Osaka Cement Co., Ltd.) and 100 g of kneaded water were sufficiently homogenized using a hand mixer to prepare cement milk. This was mixed in a rotating / revolving mixer with 1 L of kaolin (made by Kishida Chemical Co., Ltd.) as a viscous soil (wet density 1.846 g / cm 3 ) and kneaded. Specimens were produced in accordance with “Method for producing specimen without hardening”. Table 2 below shows the formulation (water content 35% by mass).
• coal ash E and the coal ash F are the same sample, and the degree of pulverization is different. The same applies to coal ash G and coal ash H.
• the mixing property of the solidified material and the clay was evaluated by a vane shear test.
• a vane shear test a vane blade having a stainless steel plate (0.5 cm ⁇ 3 cm) welded in the perpendicular direction was attached to the tip of a torque driver manufactured by Tohnichi Seisakusho Co., Ltd., and this was pushed into the sample and measured.
• the vane shear resistance value was determined from the maximum torque (see Table 2 below). The results are shown in Table 2 below. The evaluation index (see below) based on the resistance value is also shown.
• Examples 1 to 3 and 5 using pulverized coal ash had lower vane shear resistance and better kneadability. It was. As is clear from Example 4, good kneadability could be secured even if the amount of water was smaller than that in Example 1. Comparative Examples 4 and 6 were less pulverized than Examples 1 and 5, and kneadability was insufficient.
• the present invention as the amount of power generation at a coal-fired power plant increases, it is possible to effectively use coal ash whose generated amount has increased, and to improve uniformity during mixing in the soil improvement of cohesive soil. .

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Food Science & Technology (AREA)
• Environmental & Geological Engineering (AREA)
• Combustion & Propulsion (AREA)
• Civil Engineering (AREA)
• Inorganic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Processing Of Solid Wastes (AREA)
• Crushing And Grinding (AREA)
• Soil Conditioners And Soil-Stabilizing Materials (AREA)
• Medicines Containing Plant Substances (AREA)
• Detergent Compositions (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=62143886

Family Applications (1)

Country Status (8)

Families Citing this family (2)

Citations (3)

Family Cites Families (5)

• 2017
  • 2017-02-02 JP JP2017017452A patent/JP6323579B1/ja active Active
  • 2017-09-19 SG SG11201900713XA patent/SG11201900713XA/en unknown
  • 2017-09-19 AU AU2017396650A patent/AU2017396650B2/en active Active
  • 2017-09-19 KR KR1020187036007A patent/KR102202526B1/ko active IP Right Grant
  • 2017-09-19 WO PCT/JP2017/033788 patent/WO2018142661A1/ja active Application Filing
  • 2017-09-19 NZ NZ755774A patent/NZ755774A/en unknown
  • 2017-09-19 CN CN201780042909.5A patent/CN109414704B/zh active Active
• 2018
  • 2018-06-07 PH PH12018501223A patent/PH12018501223B1/en unknown

Patent Citations (3)

Also Published As

Similar Documents

Legal Events