CN109336424B - Retarded 42.5 cement production method and application - Google Patents
Retarded 42.5 cement production method and application Download PDFInfo
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- CN109336424B CN109336424B CN201811294423.3A CN201811294423A CN109336424B CN 109336424 B CN109336424 B CN 109336424B CN 201811294423 A CN201811294423 A CN 201811294423A CN 109336424 B CN109336424 B CN 109336424B
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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
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing 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
- 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
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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
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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
- 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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a production method and application of retarded 42.5 cement, and relates to the technical field of cement. A method for producing retarded 42.5 cement, comprising: mixing desulfurized gypsum, portland cement clinker and slag, adding edible white sugar, fly ash and grinding aid, performing ball milling and powder selection, allowing the mixture to enter a cement silo through a bag dust collector, discharging gas in a gas storage tank before discharging and homogenizing, discharging and homogenizing under high pressure, and discharging from the silo. By mass percentage, 76-80% of portland cement clinker, 2-8% of desulfurized gypsum, 2-8% of slag, 10-14% of fly ash, 0.001-0.035% of edible white sugar and 0.01-0.05% of grinding aid. The production method has simple process flow, can solve the problems of short initial setting and final setting time of the retarded cement, and simultaneously the cement has better compression resistance and fracture resistance.
Description
Technical Field
The invention relates to the technical field of cement, and particularly relates to a delayed coagulation 42.5 cement production method and application.
Background
With the rapid development of traffic modernization construction, the highway construction has drawn attention, and the novel traffic building material-highway subgrade ecological retarded cement required by engineering properties increases the scientific and technological content of the product, widens the market, and greatly improves the competitiveness of the product and the economic benefit of enterprises.
The performance required by the construction cushion of the highway to the retarded cement is continuously improved, the cement mills arranged on the modern novel dry normal cement production line are all combined closed-circuit grinding systems with roller presses and face challenges, 42.5 retarded cement is produced to meet the construction environment of more than 40 ℃ in high-temperature seasons in Xinjiang desert areas, the initial setting of 42.5 retarded cement is required to be more than 4.50h, the final setting is required to be more than 6.50 and less than 10.00h, the compressive strength of the cement is more than 24.0Mpa for three days and more than 42.5Mpa for twenty eight days; the flexural strength of the cement is more than 5.0Mpa in three days, and more than 8.0Mpa in twenty eight days. Under conventional conditions, products of cement enterprises have difficulty in meeting the technical requirements.
Disclosure of Invention
The invention aims to provide a retarded 42.5 cement production method, which has simple process flow, can solve the problems of short initial setting and final setting time of retarded cement, and simultaneously has better compression resistance and fracture resistance.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a delayed coagulation 42.5 cement production method, which comprises the following steps
Mixing desulfurized gypsum, portland cement clinker and slag, adding edible white sugar, fly ash and grinding aid, performing ball milling and powder selection, allowing the mixture to enter a cement silo through a bag dust collector, discharging gas in a gas storage tank before discharging and homogenizing, discharging and homogenizing under high pressure, and discharging from the silo.
By mass percentage, 76-80% of portland cement clinker, 2-8% of desulfurized gypsum, 2-8% of slag, 10-14% of fly ash, 0.001-0.035% of edible white sugar and 0.01-0.05% of grinding aid.
The beneficial effects of the invention include:
the invention adopts desulfurized gypsum, portland cement clinker, slag, edible white sugar, fly ash and grinding aid as raw materials, adjusts the proportion of the raw materials, and prepares the retarded cement with longer initial setting time and final setting time by a production method, wherein the initial setting time is more than 360min, and the final setting time is more than 420 min. The delayed coagulation cement has good compression resistance and fracture resistance, the compression strength is more than 24.0Mpa in three days, and the compression strength is more than 53Mpa in twenty-eight days; the flexural strength of the cement is more than 5.0Mpa in three days, and more than 8.0Mpa in twenty eight days. The production method has the advantages of low energy consumption, low water consumption, resource and energy conservation, and low production cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic flow diagram of a delayed coagulation 42.5 cement production method provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The production method and application of the retarded 42.5 cement of the embodiment of the invention are specifically described below.
The embodiment of the invention provides a production method of the delayed coagulation 42.5 cement, which comprises the following steps:
mixing desulfurized gypsum, portland cement clinker and slag, adding edible white sugar, fly ash and grinding aid, ball-milling and powder selecting, entering a cement silo through a bag dust collector, discharging air, discharging materials at high pressure, homogenizing and then discharging from the silo.
Specifically, the desulfurized gypsum is weighed from a desulfurized gypsum bin, the clinker is weighed from a clinker bin, and the slag is weighed from a slag bin. Conveying the weighed desulfurized gypsum, the silicate cement clinker and the slag to a powder concentrator for separation, and then conveying the materials to a cement roller press for mixing. The mixing method is combined with a closed cement mill system, so that the temperature of cement can be effectively reduced, and the setting time of the cement can be prolonged.
Further, in a preferred embodiment of the invention, the Portland cement clinker comprises C4AF and C3A, by mass percent, C4AF and C3A is not more than 16%. The initial setting time of the portland cement clinker is more than 140min, and the final setting time is more than 175 min.
It should be noted that the temperature of the portland cement clinker when entering the clinker warehouse is less than 45 ℃, and if the temperature is too high, the organic matters in the portland cement clinker volatilize and lose efficacy, which does not play a role, and shortens the setting time of the cement.
Further, in a preferred embodiment of the invention, the moisture in the slag is less than 7%, preferably the moisture in the desulfurized gypsum is less than 8%.
Respectively weighing first-grade edible white granulated sugar, fly ash and grinding aid, and sequentially conveying the first-grade edible white granulated sugar, the fly ash and the grinding aid to a ball mill and a powder concentrator. The grinding aid is added into a grinding head of the ball mill through a delivery pump, so that the grinding aid can be continuously and stably delivered, and the stability of the grinding aid is improved. And the mixture is ball-milled in a ball mill and then enters a powder selecting machine for separation. In a preferred embodiment of the invention, the temperature of the mixture at the time of output from the ball mill is less than 95 ℃. The temperature avoids the volatilization failure of organic matters in the mixture, plays no role and shortens the setting time of the cement. The edible white granulated sugar comprises a special grade, a first grade and a second grade, and the performance of the first grade edible white granulated sugar is better and has better economic benefit through experimental research of an inventor.
The grinding aid utilizes the special functions of chemical substances to activate the hydration activity of potential hydraulic materials, improve the early strength of cement, improve the fluidity of the cement and shorten the setting time of the cement. The grinding aid can reduce the surface energy of materials, weaken the aggregation effect generated by molecular attraction, and help the accelerated expansion of particle cracks when external force does work, thereby improving the grinding efficiency. After the grinding aid is used, the clinker ratio is reduced, and the mixing amount of mixed materials is increased; the economic benefits are mainly reflected in that the output per machine hour of the mill is increased, the comprehensive power consumption is reduced, and finally, the production cost per unit of cement is reduced. The application of the cement grinding aid can add a regulation and control means for saving energy, reducing consumption and improving cement performance to cement production under the condition of not increasing fixed asset investment and operating cost.
The edible white sugar and the fly ash are respectively metered and mixed and added into the grinding head, so that unstable influence factors caused by the conveying of the edible white sugar are reduced. The addition of the fly ash enables the cement to have good fluidity, improves the strength of the cement and reduces the water consumption. The specific surface area of the cement after ball milling and powder selection is 345 +/-15 kg/cm2The screen residue fineness of the cement is less than 0.1% after passing through a 0.08mm square-hole screen, and the mass percentage content of sulfur trioxide in the cement is 2.4-3%. The fluidity of the cement paste is more than 220 mm.
Preferably, edible first-grade white granulated sugar is adopted in the embodiment of the invention. It should be noted that edible white sugar can be replaced by calcium xylose or diammonium phosphate. The grinding aid in the embodiment of the invention is an alcohol amine compound.
By mass percentage, 76-80% of portland cement clinker, 2-8% of desulfurized gypsum, 2-8% of slag, 10-14% of fly ash, 0.001-0.035% of edible white sugar and 0.01-0.05% of grinding aid. Preferably, the desulfurized gypsum can be 3%, 4%, 6%, 7%, the slag can be 3%, 4%, 6%, 7%, and the edible white sugar can be 0.005%, 0.01%, 0.015%, 0.02%, 0.025%, 0.03%. The grinding aid can be 0.02%, 0.03% and 0.04%.
And the cement output from the powder concentrator enters the bag dust collector and then enters the cement warehouse. It should be noted that the temperature of the cement entering the cement silo is less than 85 ℃. After entering the cement warehouse, the cement is poured to a constant temperature of less than 70 ℃. The water in the compressed air of the air storage tank is discharged, the water in the compressed air is prevented from influencing the quality of cement, the cement is discharged at high pressure after being discharged, and the cement is homogenized and then leaves the factory.
By controlling the temperature of the cement in each stage, the volatilization failure of organic matters in the cement is avoided, the effect is not exerted, and the setting time of the cement is shortened. The cement prepared by the production method has longer initial setting time and final setting time, has better fracture resistance and compression resistance, and meets the requirements of construction environments in high-temperature seasons in Xinjiang desert areas. The production method can be applied to the preparation of retarded cement.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a retarded 42.5 cement production method, which is mainly prepared by the following steps:
the Portland cement clinker accounts for 76 percent by mass, and C in the Portland cement clinker4AF and C3A is not more than 16 percent, the desulfurized gypsum is 4.915 percent, the slag is 5 percent, the fly ash is 14 percent, the primary edible white granulated sugar is 0.035 percent, and the grinding aid is 0.05 percent. The moisture in the slag is less than 7 percent, and the moisture in the desulfurized gypsum is less than 8 percent.
Conveying the weighed desulfurized gypsum, the silicate cement clinker and the slag to a powder concentrator for separation, and then conveying the materials to a cement roller press for mixing.
Respectively weighing edible white sugar, fly ash and grinding aid, and sequentially conveying the edible white sugar, fly ash and grinding aid into a ball mill and a powder concentrator. Grinding aid is added into a grinding head of the ball mill through a delivery pump, edible white sugar and fly ash are respectively metered, mixed and added into the grinding head, and the temperature of the mixture is less than 95 ℃ when the mixture is output out of the ball mill. The specific surface area of the cement after ball milling and powder selection is 363kg/cm2And the screen residue fineness of a square-hole screen of 0.08mm is 0.1 percent.
And the cement output from the powder concentrator enters the bag dust collector and then enters the cement warehouse. The temperature of the cement entering the cement silo is less than 85 ℃. After entering the cement warehouse, the cement is poured to a constant temperature of less than 70 ℃. The cement leaves the factory after entering the cement warehouse, and the cement is discharged under high pressure after being deflated.
Examples 2 to 10 adopt the production method provided in example 1, the production steps and production parameters are the same as those of example 1, and different raw material ratios are adopted, and the specific ratios are shown in table 1:
table 1 raw material ratios of examples
The initial setting time and final setting time of the cements produced in examples 1-10 are as follows:
TABLE 2 initial setting time and final setting time of cement
As can be seen from Table 2, the initial setting time of the cement prepared in the examples 1-10 is longer than 360min, and the final setting time is longer than 420min, so that the cement meets the requirements of the construction environment of the retarded cement in the Xinjiang desert area in the high-temperature season of more than 40 ℃.
The stability of the cement prepared in the examples 1 to 10 was tested, and the fracture resistance and compression resistance of the cement were tested 3 days and 28 days after hydraulic setting, respectively, and the test results are as follows:
TABLE 3 test results
As can be seen from Table 3, the delayed coagulation cements prepared in the embodiments 1-10 of the invention have qualified stability, and the compression strength of the cement meeting the requirements of construction environment at the temperature of more than 40 ℃ in the high-temperature season in Xinjiang desert area is more than 24.0Mpa in three days and more than 42.5Mpa in twenty-eight days; the flexural strength of the cement is more than 5.0Mpa in three days, and the flexural strength is more than 8.0Mpa in twenty eight days. The retarded 42.5 cement production method provided by the invention is scientific and reasonable, and retarded cement with better performance can be prepared.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (4)
1. A method for producing retarded 42.5 cement is characterized by comprising
Mixing desulfurized gypsum, portland cement clinker and slag, adding edible white sugar, fly ash and grinding aid, performing ball milling and powder selection, allowing the mixture to enter a cement silo through a bag dust collector, discharging gas in a gas storage tank before discharging and homogenizing, discharging and homogenizing under high pressure, and discharging from the silo; the temperature of the portland cement clinker is less than 45 ℃ when the portland cement clinker enters a clinker warehouse, the temperature of the cement before passing through the bag dust collector is less than 95 ℃ after ball milling and powder selection, and the temperature of the cement entering the cement warehouse is less than 85 ℃; after entering the cement warehouse, cement is poured to a constant temperature of less than 70 ℃; the fineness of the cement subjected to ball milling and powder selection is less than 0.1% through a 0.08mm square-hole sieve, and the mass percentage of sulfur trioxide in the cement is 2.4-3%;
by mass percentage, 76-80% of portland cement clinker, 2-8% of desulfurized gypsum, 2-8% of slag, 10-14% of fly ash, 0.001-0.035% of edible white sugar and 0.01-0.05% of grinding aid; the portland cement clinker comprises C4AF and C3A, the C4AF and said C3The sum of the mass percentages of A is not more than 16%, the moisture in the slag is less than 7%, and the moisture in the desulfurized gypsum is less than 8%.
2. The retarded 42.5 cement production method according to claim 1, characterized in that, by mass percentage, the portland cement clinker is 77-79%, the desulfurized gypsum is 4-6%, the slag is 4-6%, the fly ash is 10-14%, the edible white sugar is 0.001-0.035%, and the grinding aid is 0.01-0.05%.
3. The method for producing retarded 42.5 cement according to claim 1, wherein the grinding aid is added to the grinding head of the ball mill by a delivery pump.
4. The method for producing retarded 42.5 cement according to claim 1, wherein the desulfurized gypsum, portland cement clinker and slag are measured separately, then conveyed to a powder concentrator for separation, and then conveyed to a roller press for mixing.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134667A (en) * | 2007-08-09 | 2008-03-05 | 新疆维吾尔自治区东湖水泥厂 | Granulated sugar retarded cement and production method and application of granulated sugar in retarded cement |
| CN101182139A (en) * | 2007-11-12 | 2008-05-21 | 华南理工大学 | Masonry cement having higher strength and water retention |
| CN105948544A (en) * | 2016-05-27 | 2016-09-21 | 四川省宁南县白鹤滩水泥有限责任公司 | Retarded portland cement and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134667A (en) * | 2007-08-09 | 2008-03-05 | 新疆维吾尔自治区东湖水泥厂 | Granulated sugar retarded cement and production method and application of granulated sugar in retarded cement |
| CN101182139A (en) * | 2007-11-12 | 2008-05-21 | 华南理工大学 | Masonry cement having higher strength and water retention |
| CN105948544A (en) * | 2016-05-27 | 2016-09-21 | 四川省宁南县白鹤滩水泥有限责任公司 | Retarded portland cement and preparation method thereof |
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