CN114230209A - Environment-friendly portland cement and preparation method thereof - Google Patents
Environment-friendly portland cement and preparation method thereof Download PDFInfo
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- CN114230209A CN114230209A CN202111586143.1A CN202111586143A CN114230209A CN 114230209 A CN114230209 A CN 114230209A CN 202111586143 A CN202111586143 A CN 202111586143A CN 114230209 A CN114230209 A CN 114230209A
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- 239000011398 Portland cement Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title description 5
- 239000000843 powder Substances 0.000 claims abstract description 62
- 239000002893 slag Substances 0.000 claims abstract description 29
- 229910001021 Ferroalloy Inorganic materials 0.000 claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000010881 fly ash Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000003818 cinder Substances 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 11
- 238000000227 grinding Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 230000000670 limiting effect Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- -1 fluorgypsum Substances 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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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
- 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
-
- 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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
- C04B7/19—Portland 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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- 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
-
- 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
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The environment-friendly portland cement comprises the following raw materials in percentage by mass: 50-78% of clinker, 5-20% of stone powder, 3-6% of coal slag, 4-4.5% of fluorgypsum, 0-10% of fly ash and 9.5-11.5% of ferroalloy slag; wherein, mineral powder accounting for 10 to 14 percent of the total mass is added into the environment-friendly portland cement. The environment-friendly portland cement of the invention not only solves the puzzling environmental protection problem, but also reduces the production cost of the portland cement by adding the coal cinder and the ferroalloy slag in the formula; the environment-friendly portland cement can meet the requirements of different flexural strength and compressive strength through different proportioning settings, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of portland cement, and particularly relates to environment-friendly portland cement and a preparation method thereof.
Background
The cement is a powdery hydraulic inorganic cementing material, can be formed into slurry after being stirred by adding water, can be hardened in the air or better in water, can firmly bond materials such as sand, stone and the like together, and is widely applied to engineering such as civil construction, water conservancy, national defense and the like as an important cementing material; wherein, the hydraulic cementing material is made by grinding Portland cement clinker mainly comprising calcium silicate, limestone less than 5 percent and a proper amount of gypsum, and is collectively called Portland cement.
At present, a large amount of coal slag and ferroalloy slag are generated in the metallurgical process, and people can discard the slag at will due to technical limitation, so that a serious environmental protection problem occurs; if the coal cinder and the ferroalloy slag are added into the Portland cement according to a reasonable proportion, the environmental protection problem can be avoided, and the production cost of the cement is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides environment-friendly portland cement and a preparation method thereof, and the specific technical scheme is as follows:
the environment-friendly portland cement comprises the following raw materials in percentage by mass:
50-78% of clinker, 5-20% of stone powder, 3-6% of coal slag, 4-4.5% of fluorgypsum, 0-10% of fly ash and 9.5-11.5% of ferroalloy slag;
wherein, mineral powder accounting for 10 to 14 percent of the total mass is added into the environment-friendly portland cement.
Further, the material comprises the following raw materials in percentage by mass:
78% of clinker, 5% of stone powder, 3% of coal cinder, 4.5% of fluorgypsum and 9.5% of ferroalloy slag; wherein, 14 percent of mineral powder is added.
Further, the material comprises the following raw materials in percentage by mass:
68% of clinker, 7% of stone powder, 4% of coal cinder, 4.5% of fluorgypsum, 5% of fly ash and 11.5% of ferroalloy slag; wherein, 14 percent of mineral powder is added.
Further, the material comprises the following raw materials in percentage by mass:
50% of clinker, 20% of stone powder, 6% of coal cinder, 4% of fluorgypsum, 10% of fly ash and 10% of ferroalloy slag; wherein, 10% of mineral powder is added.
Further, the clinker is composed of 80% of limestone, 15% of clay and 5% of iron powder.
The preparation method of the environment-friendly portland cement comprises the following steps:
step S1: metering clinker, stone powder, coal slag, fluorgypsum, fly ash and ferroalloy slag according to the mass percentage by a corresponding mixing tank, and conveying the materials into a rolling mill for pre-milling;
step S2: dividing the material extruded and ground in the step S1 into three parts, namely coarse powder (median diameter d is more than 150 μm), medium coarse powder (median diameter d is less than 150 μm) and fine powder (median diameter d is less than 60 μm), by a powder concentrator;
step S3: returning the coarse powder selected in the step S2 to the roller press for further pre-grinding; the selected medium coarse powder is sent into a cement ball mill for grinding, and mineral powder is added during grinding, and the medium coarse powder is conveyed to a bulk finished product warehouse after reaching the granularity of fine powder; mixing the selected fine powder with mineral powder, and directly conveying the mixture into a packaging finished product warehouse;
step S4: packaging the cement in the packaged finished product warehouse by a packaging machine for delivery; and the cement in the bulk finished product warehouse is pumped into a storage tank of a cement truck through a delivery pipe and transported out of a factory.
Furthermore, the bottom end of the conveying pipe is axially communicated and butted with a telescopic blanking device;
the telescopic discharging device comprises a first straight pipe, the top end of the first straight pipe is butted with the vertical bottom end communication of the conveying pipe through a flange, a telescopic discharging mechanism is butted with the bottom end axial communication of the first straight pipe, a second straight pipe is butted with the bottom end axial communication of the telescopic discharging mechanism, a buffer mechanism is sleeved on the outer side axial sleeve of the second straight pipe, a protective sleeve with a horn-shaped structure is butted with the bottom end axial communication of the buffer mechanism, and at least more than two canvas windows are symmetrically arranged on the outer side wall of the protective sleeve in the radial direction.
Furthermore, the telescopic unloading mechanism comprises a telescopic hose, the top end of the telescopic hose is axially communicated and butted with the bottom end of the first straight pipe, and the bottom end of the telescopic hose is axially communicated and butted with the top end of the second straight pipe; the bottom lateral wall of first straight tube radial symmetric connection has the first mounting panel that the level set up, the top lateral wall radial symmetric connection of second straight tube has the second mounting panel that the level set up, the bottom surface fixed mounting of first mounting panel has the vertical cylinder that sets up downwards, the flexible end of cylinder with the second mounting panel is connected perpendicularly.
Furthermore, the buffer mechanism comprises a first annular bump, a second annular bump, a spring, a buffer sleeve and a limit stop ring, and the first annular bump and the second annular bump are axially and fixedly sleeved on the side wall of the lower part of the second straight pipe at intervals; a buffer sleeve is axially sleeved and matched on the outer side of the lower part of the second straight pipe, the bottom of the inner side wall of the buffer sleeve is in sliding attachment with the first annular convex block, the top of the inner side wall of the buffer sleeve is in sliding attachment with the second annular convex block, and the bottom of the buffer sleeve is axially connected with the protective sleeve; the lower part of the inner side wall of the buffer sleeve is axially and integrally connected with a limit stop ring, and the inner side wall of the limit stop ring is in sliding contact with the outer side wall of the second straight pipe; the outer side wall of the second straight pipe is axially sleeved with a spring, the top end of the spring is connected with the first annular convex block, the bottom end of the spring is connected with the limiting blocking ring, and the limiting blocking ring is attached to the second annular convex block through reverse pushing of the spring.
The invention has the beneficial effects that:
the environment-friendly portland cement of the invention not only solves the puzzling environmental protection problem, but also reduces the production cost of the portland cement by adding the coal cinder and the ferroalloy slag in the formula; the environment-friendly portland cement can meet the requirements of different flexural strength and compressive strength through different proportioning settings, and has wide application prospect.
Drawings
FIG. 1 is a flow chart showing a process for producing an environmentally friendly portland cement of the present invention;
FIG. 2 is a front view of the structure of the telescopic blanking device of the present invention;
FIG. 3 is a partial structural sectional view of the telescopic blanking device of the present invention;
figure 4 shows a working illustration of the invention.
Shown in the figure: 1. a first straight pipe; 11. a flange; 2. a second straight pipe; 3. a telescopic unloading mechanism; 31. a flexible hose; 32. a cylinder; 33. a first mounting plate; 34. a second mounting plate; 4. a buffer mechanism; 41. a first annular bump; 42. a second annular bump; 43. a spring; 44. a buffer sleeve; 45. a limit stop ring; 5. a protective sleeve; 51. a canvas window; 6. a delivery pipe; 7. a cement truck storage tank; 71. a feed port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The environment-friendly portland cement comprises the following raw materials in percentage by mass:
50-78% of clinker, 5-20% of stone powder, 3-6% of coal slag, 4-4.5% of fluorgypsum, 0-10% of fly ash and 9.5-11.5% of ferroalloy slag;
wherein, mineral powder accounting for 10 to 14 percent of the total mass is added into the environment-friendly portland cement.
The first embodiment is as follows:
the environment-friendly portland cement comprises the following raw materials in percentage by mass:
78% of clinker, 5% of stone powder, 3% of coal cinder, 4.5% of fluorgypsum and 9.5% of ferroalloy slag; wherein, 14 percent of mineral powder is added.
Example two:
the environment-friendly portland cement comprises the following raw materials in percentage by mass:
68% of clinker, 7% of stone powder, 4% of coal cinder, 4.5% of fluorgypsum, 5% of fly ash and 11.5% of ferroalloy slag; wherein, 14 percent of mineral powder is added.
Example three:
the environment-friendly portland cement comprises the following raw materials in percentage by mass:
50% of clinker, 20% of stone powder, 6% of coal cinder, 4% of fluorgypsum, 10% of fly ash and 10% of ferroalloy slag; wherein, 10% of mineral powder is added.
In the first to third embodiments, the clinker is composed of 80% limestone, 15% clay and 5% iron powder.
As shown in fig. 1, in the first to third embodiments, the method for preparing environment-friendly portland cement includes the following steps:
step S1: metering clinker, stone powder, coal slag, fluorgypsum, fly ash and ferroalloy slag according to the mass percentage by a corresponding mixing tank, and conveying the materials into a rolling mill for pre-milling;
step S2: dividing the material extruded and ground in the step S1 into three parts, namely coarse powder (median diameter d is more than 150 μm), medium coarse powder (median diameter d is less than 150 μm) and fine powder (median diameter d is less than 60 μm), by a powder concentrator;
step S3: returning the coarse powder selected in the step S2 to the roller press for further pre-grinding; the selected medium coarse powder is sent into a cement ball mill for grinding, and mineral powder is added during grinding, and the medium coarse powder is conveyed to a bulk finished product warehouse after reaching the granularity of fine powder; mixing the selected fine powder with mineral powder, and directly conveying the mixture into a packaging finished product warehouse;
step S4: packaging the cement in the packaged finished product warehouse by a packaging machine for delivery; and the cement in the bulk finished product warehouse is pumped into a storage tank of a cement truck through a delivery pipe and transported out of a factory.
The quality of the cement products produced in the first to third examples are shown in the following table one:
table one:
as can be seen from the inspection item data in Table I above: the strength grade of the environment-friendly portland cement produced by the formula in the embodiment I can reach 52.5; the strength grade of the environment-friendly portland cement produced by the formula in the second embodiment can reach 42.5; the strength grade of the environment-friendly portland cement produced by the formula in the embodiment three can reach 32.5.
As shown in fig. 2, the bottom end of the feed delivery pipe 6 is axially communicated and butted with a telescopic blanking device;
the telescopic discharging device comprises a first straight pipe 1, the top end of the first straight pipe 1 is butted with a vertical bottom end communication of a conveying pipe 6 through a flange 11, a telescopic discharging mechanism 3 is butted with the bottom end axial communication of the first straight pipe 1, a second straight pipe 2 is butted with the bottom end axial communication of the telescopic discharging mechanism 3, a buffer mechanism 4 is sleeved on the outer side axial sleeve of the second straight pipe 2, a protective sleeve 5 with a horn-shaped structure is butted with the bottom end axial communication of the buffer mechanism 4, and at least more than two canvas windows 51 are symmetrically arranged on the outer side wall of the protective sleeve 5 in the radial direction.
Through the technical scheme, the arranged telescopic discharging device pushes the second straight pipe 2 to the direction of the feeding hole 71 of the cement truck storage tank 7 through the telescopic discharging mechanism 3, so that the cement truck storage tanks 7 with different heights can be conveniently butted and poured; in the butt joint in-process, at first, the contact of protective sleeve 5 and the peripheral cement car storage tank 7 outer wall of feed port 71, then, flexible shedding mechanism 3 continues to promote second straight tube 2 and removes towards feed port 71, at this moment, buffer gear 4 produces the buffering resilience effect, support protective sleeve 5 and cement car storage tank 7 outer wall tightly, both can reach the buffering effect for the whereabouts of second straight tube 2 like this, prevent to cause the damage to second straight tube 2 because the butt joint is inaccurate, can prevent again that the cement dust is escaped outward in the material filling in-process.
As shown in fig. 2, the telescopic unloading mechanism 3 comprises a telescopic hose 31, the top end of the telescopic hose 31 is axially communicated and butted with the bottom end of the first straight pipe 1, and the bottom end of the telescopic hose 31 is axially communicated and butted with the top end of the second straight pipe 2; the bottom lateral wall of first straight tube 1 is radial symmetric connection has the first mounting panel 33 that the level set up, the top lateral wall of second straight tube 2 is radial symmetric connection has the second mounting panel 34 that the level set up, the bottom surface fixed mounting of first mounting panel 33 has the vertical cylinder 32 that sets up downwards, the flexible end of cylinder 32 with second mounting panel 34 is connected perpendicularly.
By the technical scheme, the telescopic hose 31 is matched with the cylinder 32, so that the telescopic effect of the second straight pipe 2 can be quickly achieved; the two cylinders 32 which are radially symmetrical can ensure that the telescopic hose 31 cannot be excessively twisted in the telescopic process to influence the cement blanking speed.
As shown in fig. 3 and 4, the buffering mechanism 4 includes a first annular protrusion 41, a second annular protrusion 42, a spring 43, a buffering sleeve 44, and a limit stop ring 45, and the first annular protrusion 41 and the second annular protrusion 42 are axially and fixedly sleeved on the lower side wall of the second straight pipe 2 at an interval; a buffer sleeve 44 is axially sleeved and matched on the outer side of the lower part of the second straight pipe 2, the bottom of the inner side wall of the buffer sleeve 44 is in sliding contact with the first annular bump 41, the top of the inner side wall of the buffer sleeve 44 is in sliding contact with the second annular bump 42, and the bottom of the buffer sleeve 44 is axially connected with the protection sleeve 5; the lower part of the inner side wall of the buffer sleeve 44 is axially and integrally connected with a limit stop ring 45, and the inner side wall of the limit stop ring 45 is in sliding contact with the outer side wall of the second straight pipe 2; a spring 43 is axially sleeved on the outer side wall of the second straight pipe 2, the top end of the spring 43 is connected with the first annular bump 41, the bottom end of the spring 43 is connected with the limit stop ring 45, and the limit stop ring 45 is attached to the second annular bump 42 through the reverse pushing of the spring 43.
Through the technical scheme, in the downward moving process of the second straight pipe 2, the first annular bump 41 moves downward along with the second straight pipe to compress the spring 43 to realize a buffering effect, and meanwhile, the counterforce of the spring 43 pushes the limiting blocking ring 45 to press the protecting sleeve 5 downward, so that the protecting sleeve 5 and the protecting sleeve 5 are tightly abutted against the outer wall of the cement truck storage tank 7; the second annular bump 42 abuts against the edge of the feed hole 71 of the cement truck storage tank 7 after moving downwards, and can limit the downward movement distance of the second straight pipe 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The environment-friendly portland cement is characterized by comprising the following raw materials in percentage by mass:
50-78% of clinker, 5-20% of stone powder, 3-6% of coal slag, 4-4.5% of fluorgypsum, 0-10% of fly ash and 9.5-11.5% of ferroalloy slag;
wherein, mineral powder accounting for 10 to 14 percent of the total mass is added into the environment-friendly portland cement.
2. The environment-friendly portland cement according to claim 1, comprising the following raw materials by mass:
78% of clinker, 5% of stone powder, 3% of coal cinder, 4.5% of fluorgypsum and 9.5% of ferroalloy slag; wherein, 14 percent of mineral powder is added.
3. The environment-friendly portland cement according to claim 1, comprising the following raw materials by mass:
68% of clinker, 7% of stone powder, 4% of coal cinder, 4.5% of fluorgypsum, 5% of fly ash and 11.5% of ferroalloy slag; wherein, 14 percent of mineral powder is added.
4. The environment-friendly portland cement according to claim 1, comprising the following raw materials by mass:
50% of clinker, 20% of stone powder, 6% of coal cinder, 4% of fluorgypsum, 10% of fly ash and 10% of ferroalloy slag; wherein, 10% of mineral powder is added.
5. The environmentally friendly portland cement according to any one of claims 1 to 4, wherein: the clinker is composed of 80% of limestone, 15% of clay and 5% of iron powder.
6. The method for preparing environment-friendly portland cement according to any one of claims 1 to 4, comprising the following steps:
step S1: metering clinker, stone powder, coal slag, fluorgypsum, fly ash and ferroalloy slag according to the mass percentage by a corresponding mixing tank, and conveying the materials into a rolling mill for pre-milling;
step S2: dividing the material extruded and ground in the step S1 into three parts, namely coarse powder (median diameter d is more than 150 μm), medium coarse powder (median diameter d is less than 150 μm) and fine powder (median diameter d is less than 60 μm), by a powder concentrator;
step S3: returning the coarse powder selected in the step S2 to the roller press for further pre-grinding; the selected medium coarse powder is sent into a cement ball mill for grinding, and mineral powder is added during grinding, and the medium coarse powder is conveyed to a bulk finished product warehouse after reaching the granularity of fine powder; mixing the selected fine powder with mineral powder, and directly conveying the mixture into a packaging finished product warehouse;
step S4: packaging the cement in the packaged finished product warehouse by a packaging machine for delivery; and the cement in the bulk finished product warehouse is pumped into a storage tank of a cement truck through a delivery pipe and transported out of a factory.
7. The method for preparing environment-friendly portland cement according to claim 6, wherein: the bottom end of the conveying pipe is axially communicated and butted with a telescopic blanking device;
the telescopic discharging device comprises a first straight pipe, the top end of the first straight pipe is butted with the vertical bottom end communication of the conveying pipe through a flange, a telescopic discharging mechanism is butted with the bottom end axial communication of the first straight pipe, a second straight pipe is butted with the bottom end axial communication of the telescopic discharging mechanism, a buffer mechanism is sleeved on the outer side axial sleeve of the second straight pipe, a protective sleeve with a horn-shaped structure is butted with the bottom end axial communication of the buffer mechanism, and at least more than two canvas windows are symmetrically arranged on the outer side wall of the protective sleeve in the radial direction.
8. The method for preparing environment-friendly portland cement according to claim 7, wherein: the telescopic unloading mechanism comprises a telescopic hose, the top end of the telescopic hose is axially communicated and butted with the bottom end of the first straight pipe, and the bottom end of the telescopic hose is axially communicated and butted with the top end of the second straight pipe; the bottom lateral wall of first straight tube radial symmetric connection has the first mounting panel that the level set up, the top lateral wall radial symmetric connection of second straight tube has the second mounting panel that the level set up, the bottom surface fixed mounting of first mounting panel has the vertical cylinder that sets up downwards, the flexible end of cylinder with the second mounting panel is connected perpendicularly.
9. The method for preparing environment-friendly portland cement according to claim 8, wherein: the buffer mechanism comprises a first annular bump, a second annular bump, a spring, a buffer sleeve and a limit baffle ring, and the first annular bump and the second annular bump are axially and fixedly sleeved on the side wall of the lower part of the second straight pipe at intervals; a buffer sleeve is axially sleeved and matched on the outer side of the lower part of the second straight pipe, the bottom of the inner side wall of the buffer sleeve is in sliding attachment with the first annular convex block, the top of the inner side wall of the buffer sleeve is in sliding attachment with the second annular convex block, and the bottom of the buffer sleeve is axially connected with the protective sleeve; the lower part of the inner side wall of the buffer sleeve is axially and integrally connected with a limit stop ring, and the inner side wall of the limit stop ring is in sliding contact with the outer side wall of the second straight pipe; the outer side wall of the second straight pipe is axially sleeved with a spring, the top end of the spring is connected with the first annular convex block, the bottom end of the spring is connected with the limiting blocking ring, and the limiting blocking ring is attached to the second annular convex block through reverse pushing of the spring.
Priority Applications (1)
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