CN104446035A - Method capable of increasing mineral powder mixing amount of road cement - Google Patents
Method capable of increasing mineral powder mixing amount of road cement Download PDFInfo
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- CN104446035A CN104446035A CN201410684150.9A CN201410684150A CN104446035A CN 104446035 A CN104446035 A CN 104446035A CN 201410684150 A CN201410684150 A CN 201410684150A CN 104446035 A CN104446035 A CN 104446035A
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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
Abstract
The invention discloses a method capable of increasing mineral powder mixing amount of road cement. The method comprises the steps of adjusting gradation of a mill: arranging an activated flow limiting ring in a fine grinding bin for powder milling, flow control and raising, adjusting gradation of a grinding body in the mill according to varieties of a material and the cement, adjusting technological parameters including the size of a screening device, ventilation in the mill and mill speed according to parameters of the material to optimize powder selecting efficiency of the mill, calibrating and inspecting a measurement weigher regularly, improving clinker strength, and adjusting the mixing amount of granulated blast-furnace slag powder to allow the weight percentages of the granulated blast-furnace slag powder, gypsum and clinker to be 7.9%, 5.0% and 87.7% respectively. The method capable of increasing the mineral powder mixing amount of the road cement can overcome the defects of unreasonable mill gradation, poor measurement accuracy, low clinker strength and the like in the prior art to achieve the advantages of reasonable mill gradation, high measurement accuracy and high clinker strength.
Description
Technical field
The present invention relates to cement processing technique field, particularly, relate to a kind of method that can improve road cement contents of ground slag.
Background technology
Needs due to Liuzhou airport expansion in 2013, our company starts to produce road cement in batches.Considering cement industry dog-eat-dog, reducing production cost is the only way of enterprise; The GBFS surplus capacity of my company #4 production line slag vertical-mill production is comparatively large simultaneously, and mill is completely stopped in frequent storehouse, and mill running rate is lower.For making full use of Vertical Mill production capacity, companies ask 1# production line produces road cement by mixing GBFS (referred to as breeze) after homogenizer.
Guangxi Yu Feng cement limited-liability company 1# production line is built in 1958, belongs to wet method line production line, within 2002, transform wet grinding and dry burning type production line as.Our quality portion 1# line batching QC-group directly mixes powdered ore quality situation to cement and is responsible for, and breeze also has larger impact to strength of cement.
The road cement contents of ground slag that in June, 2013-October produces on average only has 3.4%, needs to improve road cement contents of ground slag.In order to more give full play to the activity of GBFS, system is mixed after homogenizer breeze built by 1# line by my company.We add up the contents of ground slag of the road cement that 6-10 month 1# line in 2013 is produced and ultimate compression strength, and statistic data is as following table:
The blending amount of mixture material average out to 3.4% of the road cement of the 6-10 month in 2013, wherein has 4 months and does not reach performance assessment criteria (check requirements road cement blending amount of mixture material is not less than 5.0%).Cement 3 days ultimate compression strength is 25.5MPa, and 28 days ultimate compression strength is 51.1MPa, and strength stability is better, and be up to state standards requirement.To regulation in GB13693-2005 " road silicate cement ": in road cement active mixed material volume count 0 ~ 10% by massfraction, R3 >=21MPa, R28 >=42.5 MPa.The road cement that 1# line is produced also has greatly improved space.
Operant level is low, fluctuation of service.Grinding machine grating is unreasonable.Validation criteria: companies ask road cement is less than 3 μm of intervals and controls as far as possible below 23%, and 3-32 μm of range restraint is between 55-70%.We carry out grain composition analysis for 6-10 month cement sample, and analytical results is as follows:
As can be seen from the above table, 1# line road cement is less than 3 μm of intervals and reaches 25.86%, because the grinding machine producing road cement used is less, lower during platform, and belongs to open circuit mill, and the phenomenon that open circuit mill cement existed grinding is more serious.Because the particle being less than 3 μm is too many, the water requirement of cement is bigger than normal, contract with dry rate large, easily makes concrete produce fine cracks, has a strong impact on concrete weather resistance and erosion resistance; The intensity of 3-32 μm of interval particle to cement plays a major role, and therefore must improve the granule content of this interval cement.
Weighing balance fluctuates.Metering outfit pressure transmitter, weighing-appliance without dust stratification, not stuckly affect metering accuracy.Breeze specific surface area is high, comparatively powder, is easily bonded on belt when passing through belt of weighing, and the treatment time affects tare weight metering for a long time not in time.Homogenizer system pressure sensor is very sensitive, is easy to by concrete grey small-particle stuck, affects accurate measurement rate.The weighing balance accuracy of breeze directly affects the quality of cement, contents of ground slag is more than 5%, if metering fluctuation 1-2%, 3 days ultimate compression strength can decline about 2.0MPa, and breeze is larger on cement ultimate compression strength impact in 3 days, so how to ensure accuracy and the stability of weighing balance, it is the problem that must think deeply.
Putty process not in time.Validation criteria: the bistrique material putty treatment time is no more than 10min, exceedes, stops mill process.The clinker masses, gypsum moisture height caking all easily causes bistrique putty.Not in time, cement grinding mill is in and shakes mill state to cause cement quality to fluctuate large in putty process.Our company has established grating frame on cement feeding bin top, avoids the situation of bulk grog putty.Though outdoor storehouse gypsum moisture content is high inevitable, our company is strict with at fine day broken gypsum and increases stock's margin and unifies heap and be stored in associating storehouse, avoids the cement quality caused greatly because of gypsum moisture content and fluctuates.Breeze blanking can better blanking by means of the negative pressure that roots blower produces.At present because the situation of grog, gypsum problem putty can process substantially in 5min.
Powdered ore quality fluctuates.75 grades of breeze Standard, 7 days active >=55%, 28 days active >=75%.We add up for the activity index of 6-10 month breeze in 2013, see the following form:
As can be seen from the above table, my company's breeze activity index is very stable, and fluctuation range is very little.Clinker strength is low.Validation criteria: goal road grog ultimate compression strength: R28 >=55MPa.Within 2013,6-10 month clinker strength only reaches 55MPa in one month, and clinker strength is lower.See Fig. 1.GB13693-2005< road silicate cement > standard specifies: road cement is by road silicate grog, the mixing material that proper amount of gypsum and standard specify, the levigate hydraulic cementing materials made.Contents of ground slag is large, affects amplitude comparatively greatly, therefore will improve contents of ground slag, must improve clinker strength cement 3 days ultimate compression strength.Clinker strength is low directly affects strength of cement and blending amount of mixture material, how to improve clinker strength and is beneficial to that to improve blending amount of mixture material be the problem that our group must think deeply.
Essential factor is determined: one, grinding machine grating is unreasonable; Two, measure inaccurate; Three, clinker strength is low.
Realizing in process of the present invention, contriver finds at least to exist in prior art the defect such as grinding machine grating is unreasonable, metering accuracy is poor and clinker strength is low.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of method that can improve road cement contents of ground slag, to realize the advantage that grinding machine grating is reasonable, metering accuracy good and clinker strength is high.
For achieving the above object, the technical solution used in the present invention is: a kind of method that can improve road cement contents of ground slag, comprising:
A, adjustment grinding machine grating; That is, activation current limliting circle is set in fine grinding storehouse, for grinding, flow control and lifting; According to grinding body gradation in material and cement type adjustment grinding machine; Comprehensive material parameter adjustment comprises the processing parameter of screening plant size, mill inner ventilation, mill speed, optimizes grinding machine grinding efficiency;
B, periodic calibrating and inspection weighing balance;
C, raising clinker strength;
The volume of d, adjustment GBFS, makes the weight percent content of GBFS, gypsum and grog as follows:
GBFS: 7.9%;
Gypsum: 5.0%;
Grog: 87.1.
Further, described step b, specifically comprises:
(1) materials calibration is carried out to breeze blanking measurement, set certain discharge quantity, then start breeze blanking, utilize canning cart to load from feed opening breeze out, then weigh, draw breeze weight, then contrast with set(ting)value;
(2) strengthen the supervision to each weighing balance and maintenance, ensure that the accurate stable of material mixes;
(3) regularly every two months materials calibrations breeze weighing balance, checks a road cement breeze component concentration weekly simultaneously.
Further, described step c, specifically comprises:
(1) calcining temperature is improved
Improve calcining temperature prerequisite and must improve quality of pc, adopt natural resources first mixed coal, reduce coal dust moisture;
(2) kiln flyash stabilization is improved: a sample is got in every 30 minutes on fortune coal belt by each class, and the technical analysis of inspection coal, holds coal ash situation in time, ensure the stability into kiln coal ash;
(3) thermal regulation is improved: improve secondary air temperature, reduce feeding capacity, strengthen kiln hood calcining; Secondary air temperature by about original 950 DEG C bring up to more than 1020 DEG C, feeding capacity is reduced to 2400t/d by original 2600t/d, kiln hood coal brings up to 7.0t/h by 6.6t/h.
The method that can improve road cement contents of ground slag of various embodiments of the present invention, owing to comprising: regulate grinding machine grating; That is, activation current limliting circle is set in fine grinding storehouse, for grinding, flow control and lifting; According to grinding body gradation in material and cement type adjustment grinding machine; Comprehensive material parameter adjustment comprises the processing parameter of screening plant size, mill inner ventilation, mill speed, optimizes grinding machine grinding efficiency; Periodic calibrating and inspection weighing balance; Improve clinker strength; The volume of adjustment GBFS, makes the weight percent content of GBFS, gypsum and grog to be: GBFS: 7.9%; Gypsum: 5.0%; Grog: 87.1; Thus the defect that in prior art, grinding machine grating is unreasonable, metering accuracy is poor and clinker strength is low can be overcome, to realize the advantage that grinding machine grating is reasonable, metering accuracy good and clinker strength is high.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification sheets, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is 6-10 month road grog figure in 2013;
Fig. 2 is the grinding machine schematic diagram before transformation;
Fig. 3 is improved grinding machine schematic diagram in the present invention;
Fig. 4 be in the present invention in January ,-2014 in November, 2013 grog ultimate compression strength figure.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
1-first grade of general dual layer bin isolation board; 2-second gear general dual layer bin isolation board; 3-tradition discharge system; 4-ordinary steel is forged; 5-first sorting subsystem; 6-second sorting subsystem; 7-activates arc current limliting circle; 8-divides selective grinding special discharge system; The micro-forging of 9-wear-resistant complex alloy.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, as Figure 1-Figure 4, provide a kind of method that can improve road cement contents of ground slag, comprising:
A, adjustment grinding machine grating; That is, activation current limliting circle is set in fine grinding storehouse, for grinding, flow control and lifting; According to grinding body gradation in material and cement type adjustment grinding machine; Comprehensive material parameter adjustment comprises the processing parameter of screening plant size, mill inner ventilation, mill speed, optimizes grinding machine grinding efficiency;
B, periodic calibrating and inspection weighing balance; Step b, specifically comprises:
(1) materials calibration is carried out to breeze blanking measurement, set certain discharge quantity, then start breeze blanking, utilize canning cart to load from feed opening breeze out, then weigh, draw breeze weight, then contrast with set(ting)value;
(2) strengthen the supervision to each weighing balance and maintenance, ensure that the accurate stable of material mixes;
(3) regularly every two months materials calibrations breeze weighing balance, checks a road cement breeze component concentration weekly simultaneously;
C, raising clinker strength; Step c, specifically comprises:
(1) calcining temperature is improved
Improve calcining temperature prerequisite and must improve quality of pc, adopt natural resources first mixed coal, reduce coal dust moisture;
(2) kiln flyash stabilization is improved: a sample is got in every 30 minutes on fortune coal belt by each class, and the technical analysis of inspection coal, holds coal ash situation in time, ensure the stability into kiln coal ash;
(3) thermal regulation is improved: improve secondary air temperature, reduce feeding capacity, strengthen kiln hood calcining; Secondary air temperature by about original 950 DEG C bring up to more than 1020 DEG C, feeding capacity is reduced to 2400t/d by original 2600t/d, kiln hood coal brings up to 7.0t/h by 6.6t/h;
The volume of d, adjustment GBFS, makes the weight percent content of GBFS, gypsum and grog as follows:
GBFS: 7.9%;
Gypsum: 5.0%;
Grog: 87.1.
The goal-setting of technical solution of the present invention: require (being not less than 5%) the blending amount of mixture material of road cement according to department, the incorporation of breeze is 5.0%.
feasibility and analysis on Necessity is carried out below for the target determined:
1, my company produces road cement contents of ground slag all about 3.4%, and in order to fully mix breeze, we have done a series of road cement and have mixed breeze test in laboratory, show that data are as following table:
After road cement mixes different ratio breeze as can be seen from the above table, along with the incorporation of breeze strengthens, strength degradation trend comparison in 3 days is obvious, and when especially breeze incorporation reaches more than 5.0%, fall strengthens; Within 28 days, strength degradation amplitude is less.When the volume of breeze is 5.0%, within 3 days, strength degradation is about 2.6MPa, but still higher than national standard (3 days ultimate compression strength >=21MPa) 4.4MPa, has more having more than needed.
2, the road cement breeze addition content produced the 6-10 month in 2013 from upper Biao Laikanwo company is 3.4%, and has do not reach check requirements April, improves road cement contents of ground slag, reduces production cost imperative; And ultimate compression strength is more stable, which reduces whole GBFS and mix quality risk in process.
gameeing of technical solution of the present invention:
Mix the major cause in P.C32.5 cement according to the powder affecting granulated blast-furnace slag, formulated concrete countermeasures, and made strategy table:
the countermeasure of technical solution of the present invention is implemented:
Implement one, regulate grinding machine grating
Activation current limliting circle is set in fine grinding storehouse, helps grinding, flow control and lifting; According to grinding body gradation in material and cement type adjustment mill; The processing parameters such as comprehensive material parameter adjustment screening plant size, mill inner ventilation, mill speed, optimize grinding machine grinding efficiency.See Fig. 2 and Fig. 3.
In fig. 2, grinding machine comprises the first grade of general dual layer bin isolation board 1, second gear general dual layer bin isolation board 2 and the traditional discharge system 3 that connect successively, is provided with ordinary steel forging 4 in traditional discharge system 3.
In figure 3, grinding machine comprises the first sorting subsystem 5, the second sorting subsystem 6, activation arc current limliting circle 7 and point special discharge system 8 of selective grinding that connect successively, in point special discharge system of selective grinding 8, be provided with the micro-forging 9 of wear-resistant complex alloy.
Compliance test result: we by improved go out to grind cement adopt laser particle size analyzer be size distribution figure.Find 0 ~ 3 μm of fine grain content control about 21% than before to reduce the granule content of about 4%, 3 ~ 32 μm be about 59% improve about 4% than before.After adjustment grain composition, the intensity of cement also improves 4.2Mpa.
Enforcement two, periodic calibrating and inspection weighing balance
(1) materials calibration is carried out to breeze blanking measurement, set certain discharge quantity, then start breeze blanking, utilize canning cart to load from feed opening breeze out, then weigh, draw breeze weight, then contrast with set(ting)value.Demarcate and carried out 5 times altogether, correlation data is as shown in the table:
(2) the routine maintenance responsibility of each weighing balance of specification.Strengthen the supervision to each weighing balance and maintenance, ensure that the accurate stable of material mixes.Supervise and patrol and examine post personnel and carry out scene in strict accordance with relevant regulations stipulate and patrol and examine and safeguard, Timeliness coverage is also dealt with problems, and each class at least clears up more than twice, and carries out associated note.And this regulation is added in " a subsidiary factory grinding machine operator responsibilities ".
(3) regularly every two months materials calibrations breeze weighing balance, checks a road cement breeze component concentration weekly simultaneously.
Compliance test result:
Supervise through nominal and General Maintenance, as can be seen from the above table, breeze composition analysis result and weighing balance measure volume error and substantially all control within 1.0%.
Implement three, improve clinker strength
(1), calcining temperature is improved
High-temperature calcination can improve grog mesosilicic acid salt mineral content, increases A mineral content and improves the activity in A ore deposit and B ore deposit, thus improving the intensity of grog.Improve calcining temperature prerequisite and must improve quality of pc, reduce coal dust moisture.Because coal source is different, coal ash difference is larger, for improving quality of pc, we have selected natural resources first mixed coal (coal ash A:20 ± 5%, volatile matter V:27 ± 5%, coal dust moisture 1.0 ± 0.5% specially, thermal value 21000-25000kj/kg) be specifically designed to and produce road grog, coal source is single, coal steady quality, thermal value is sufficient, and kiln calcining temperature effectively improves.
(2), improve into kiln flyash stabilization.Require that watchman appears in person supervision crane by the situation of proportioning by the position fortune coal that collapses when transporting coal.A sample is got, the technical analysis of half class of combinatorial test coal in every 30 minutes on fortune coal belt by each class simultaneously, so just can hold coal ash situation in time, ensure the stability into kiln coal ash.
(3), thermal regulation is improved: improve secondary air temperature, reduce feeding capacity, strengthen kiln hood calcining.Secondary air temperature by about original 950 DEG C bring up to more than 1020 DEG C, feeding capacity is reduced to 2400t/d by original 2600t/d, kiln hood coal brings up to 7.0t/h by 6.6t/h.
After taking above measure, clinker strength is effectively promoted.See Fig. 4.
Effect inspection: we add up the quality condition of the road cement mixed after this activity:
The volume of GBFS reaches 7.9% as can be seen from the above table, and ultimate compression strength is very stable, all in examination scope.Breeze incorporation between in November, 2013 to active period in January, 2014 in road cement, all higher than predetermined target value, on average reaches 7.9%, and development of the activity achieves good effect.
Economic benefit, this time the movable main benefit produced has:
1. 2013.11-2014.01 #1 production line produces road cement 30000 tons, and price difference reaches 4.1 yuan/ton, produces a profit and reaches 12.3 ten thousand yuan, and this project is that company creates considerable economic benefit.
Improve quality mind and the responsibility sense of relevant station personnel.
Consolidation effect: in February, 2014-March road cement breeze incorporation on average reach 8.4%: in achievement consolidation 1# line road cement, GBFS incorporation is 8.4%.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. can improve a method for road cement contents of ground slag, it is characterized in that, comprising:
A, adjustment grinding machine grating; That is, activation current limliting circle is set in fine grinding storehouse, for grinding, flow control and lifting; According to grinding body gradation in material and cement type adjustment grinding machine; Comprehensive material parameter adjustment comprises the processing parameter of screening plant size, mill inner ventilation, mill speed, optimizes grinding machine grinding efficiency;
B, periodic calibrating and inspection weighing balance;
C, raising clinker strength;
The volume of d, adjustment GBFS, makes the weight percent content of GBFS, gypsum and grog as follows:
GBFS: 7.9%;
Gypsum: 5.0%;
Grog: 87.1.
2. the method that can improve road cement contents of ground slag according to claim 1, is characterized in that, described step b, specifically comprises:
(1) materials calibration is carried out to breeze blanking measurement, set certain discharge quantity, then start breeze blanking, utilize canning cart to load from feed opening breeze out, then weigh, draw breeze weight, then contrast with set(ting)value;
(2) strengthen the supervision to each weighing balance and maintenance, ensure that the accurate stable of material mixes;
(3) regularly every two months materials calibrations breeze weighing balance, checks a road cement breeze component concentration weekly simultaneously.
3. the method that can improve road cement contents of ground slag according to claim 1 and 2, is characterized in that, described step c, specifically comprises:
(1) calcining temperature is improved
Improve calcining temperature prerequisite and must improve quality of pc, adopt natural resources first mixed coal, reduce coal dust moisture;
(2) kiln flyash stabilization is improved: a sample is got in every 30 minutes on fortune coal belt by each class, and the technical analysis of inspection coal, holds coal ash situation in time, ensure the stability into kiln coal ash;
(3) thermal regulation is improved: improve secondary air temperature, reduce feeding capacity, strengthen kiln hood calcining; Secondary air temperature by about original 950 DEG C bring up to more than 1020 DEG C, feeding capacity is reduced to 2400t/d by original 2600t/d, kiln hood coal brings up to 7.0t/h by 6.6t/h.
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Application publication date: 20150325 |