CN112094062A - Process for producing cement from low-grade limestone - Google Patents
Process for producing cement from low-grade limestone Download PDFInfo
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- CN112094062A CN112094062A CN202010852404.9A CN202010852404A CN112094062A CN 112094062 A CN112094062 A CN 112094062A CN 202010852404 A CN202010852404 A CN 202010852404A CN 112094062 A CN112094062 A CN 112094062A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a process for producing cement from low-grade limestone, which relates to the technical field of cement production and comprises the following steps: low-grade limestone is subjected to pre-homogenization treatment and then is ground with other raw materials to prepare raw material powder; pouring the mixture into a preheating chamber for preheating, and starting kiln exhaust equipment to convey gas into the preheating chamber for preheating; acquiring atmosphere temperature data of the positions of the temperature detection modules within the latest unit time t; when the atmosphere temperature data reaches the threshold temperature, judging that the preheating is finished; feeding into a rotary kiln for calcining to prepare clinker; mixing the clinker with other auxiliary materials and grinding the mixture to a certain fineness to prepare the cement. According to the invention, the raw material powder in the preheating chamber is judged to be uniformly preheated by the temperature value which can be judged when the temperature in the preheating chamber is detected by each temperature detection module to reach the preset value and the temperature fluctuation rate is lower than the preset value, so that the calcination in the next step is facilitated, the utilization rate of energy and time can be effectively improved, and the quality of the produced cement is improved.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a process for producing cement from low-grade limestone.
Background
The cement is a powdery hydraulic inorganic cementing material, which is added with water and stirred into slurry, can be hardened in the air or better in water, and can firmly bond sand, stone and other materials together, the early mixture of lime and volcanic ash is very similar to the modern lime and volcanic ash cement, and the concrete made of broken stone cemented by the cement has higher strength after being cured and can resist the erosion of fresh water or salt water.
The raw meal powder is preheated before entering the rotary kiln, the preheating state of the raw meal powder cannot be accurately judged by the conventional preheating chamber, the impurities of the calcined cement clinker can affect the quality of the cement finished product due to uneven preheating of the raw meal powder, and the heat loss can be caused due to excessive preheating.
Disclosure of Invention
In order to overcome the defects, the invention provides a process for producing cement by using low-grade lime, which is characterized by comprising the following steps:
step S1, performing pre-homogenization treatment on the low-grade limestone, and grinding the low-grade limestone after the pre-homogenization treatment and other raw materials according to a preset proportion to prepare raw material powder;
step S2, pouring the raw meal into a preheating chamber for preheating, wherein the preheating chamber comprises a main body, a feeding bin, a conveying chute, a discharging device and at least two temperature detection modules, the feeding bin is arranged above the main body, the conveying chute is fixedly arranged in the main body and is positioned below the feeding bin, the discharging device is positioned below the inner part of the main body, the temperature detection modules are uniformly distributed in the main body and are positioned between the conveying chute and the discharging device, and the temperature detection modules are used for measuring the atmosphere temperature between the conveying chute and the discharging device;
step S3, starting kiln exhaust equipment to transmit gas into the preheating chamber and preheat; the temperature of the waste gas used for gas transmission is constant temperature Thw；
Step S4, obtaining atmosphere temperature data of the position of each temperature detection module in the latest unit time t;
step S5, when the atmosphere temperature data reaches the threshold temperature, the preheating is judged to be completed; the threshold temperature is less than a constant temperature Thw；
Step S6, feeding the preheated raw material powder into a rotary kiln for calcination to prepare clinker;
and step S7, mixing the clinker with other auxiliary materials in proportion and grinding the mixture to a certain fineness to prepare the cement.
Because the raw meal powder is solid powder, the temperature of the raw meal powder can not be directly measured, so the preheating condition is represented by adopting the atmosphere temperature, the raw meal powder in the preheating chamber is judged to be preheated uniformly by judging that the temperature reaches the threshold temperature or the fluctuation rate is lower than the temperature value which can be judged by the preset value, the calcination in the next step is facilitated, the utilization rate of energy and time can be effectively improved, and the quality of the produced cement is improved.
In this embodiment, the low-grade limestone content during the pre-homogenization treatment is 37% -42%, and the grade of the pre-homogenized limestone is not lower than 45.5%.
In the embodiment, the limestone is pre-homogenized, so that the taste of the limestone is improved, the low-grade limestone can be fully utilized, the use of high-quality limestone is further reduced, the resource waste is reduced, and the production cost is saved.
In this embodiment, the threshold temperature is less than the constant temperature ThwAnd the difference is 5-20 ℃;
in another embodiment, step S5 may further determine that preheating is completed in response to that the temperature fluctuation rate K in the preheating bin is smaller than a preset value; the above-mentioned
The T isimaxIs the maximum value in the temperature data detected by the ith temperature detection module in the latest unit time TiminIs the minimum value in the temperature data detected by the ith temperature detection module in the latest unit time t
Similar to bubbles floating upwards in liquid, because of different heat absorption of raw material powder, waste gas conveyed by kiln exhaust equipment is in a gas cluster shape in a preheating cavity and continuously floats upwards, and the temperature trend is reduced along with the heat absorption of the raw material powder, different time at the same position is equivalent to measuring atmosphere temperature values of different gas clusters, and better fluctuation judgment is determined by a temperature difference value between the gas cluster with the maximum temperature and the gas cluster with the minimum temperature; in the technical scheme, the method comprises the following steps
The temperature fluctuation rate is obtained, and the fluctuation of the temperature in the preheating bin is effectively represented.
In this example, the other materials include sandstone, converter slag, fly ash, and iron beneficiated sludge.
In this embodiment, the preheating chamber is further provided with a material scattering device.
In this technical scheme, spill the material device and can guarantee that the material is in preheating the indoor abundant even heat transfer, the more abundant with the steam contact of material, steam is better to the heating effect of material, energy-conserving effect is also better.
In this embodiment, the temperature of the rotary kiln during calcination is 1400 ℃ to 1600 ℃.
The invention has the beneficial effects that: because the raw meal powder is solid powder, the temperature of the raw meal powder can not be directly measured, so the preheating condition is represented by adopting the atmosphere temperature, the raw meal powder in the preheating chamber is judged to be preheated uniformly by judging that the temperature reaches the threshold temperature or the fluctuation rate is lower than the temperature value which can be judged by the preset value, the calcination in the next step is facilitated, the utilization rate of energy and time can be effectively improved, and the quality of the produced cement is improved.
Drawings
FIG. 1 is a flow chart of a process for producing cement from low-grade limestone according to the present invention;
fig. 2 is a schematic structural diagram of a preheating chamber in a process for producing cement from low-grade limestone, provided by the invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 and fig. 2, the invention provides a process for producing cement from low-grade lime, which is characterized by comprising the following steps:
step S1, performing pre-homogenization treatment on the low-grade limestone, and grinding the low-grade limestone after the pre-homogenization treatment and other raw materials according to a preset proportion to prepare raw material powder;
step S2, pouring the raw meal into a preheating chamber for preheating, wherein the preheating chamber comprises a main body 1, a feeding bin 2, a conveying chute 3, a discharging device 4, at least two temperature detection modules 5, the feeding bin 2 is arranged above the main body 1, the conveying chute 3 is fixedly arranged in the main body 1 and is positioned below the feeding bin 2, the discharging device 4 is positioned below the inner part of the main body 1, the temperature detection modules 5 are uniformly distributed in the main body 1 and are positioned between the conveying chute 3 and the discharging device 4, and the temperature detection modules 5 are used for measuring the atmosphere temperature between the conveying chute 3 and the discharging device 4;
step S3, starting kiln exhaust equipment to transmit gas into the preheating chamber and preheat; the temperature of the waste gas used for gas transmission is constant temperature Thw；
Step S4, obtaining atmosphere temperature data of the position of each temperature detection module in the latest unit time t;
step S5, responding to the atmosphere temperature dataWhen the temperature reaches the threshold value, judging that the preheating is finished; the threshold temperature is less than a constant temperature Thw；
Step S6, feeding the preheated raw material powder into a rotary kiln for calcination to prepare clinker;
and step S7, mixing the clinker with other auxiliary materials in proportion and grinding the mixture to a certain fineness to prepare the cement.
Because the raw meal powder is solid powder, the temperature of the raw meal powder can not be directly measured, so the preheating condition is represented by adopting the atmosphere temperature, the raw meal powder in the preheating chamber is judged to be preheated uniformly by judging that the temperature reaches the threshold temperature or the fluctuation rate is lower than the temperature value which can be judged by the preset value, the calcination in the next step is facilitated, the utilization rate of energy and time can be effectively improved, and the quality of the produced cement is improved.
In this embodiment, the low-grade limestone content during the pre-homogenization treatment is 37% -42%, and the grade of the pre-homogenized limestone is not lower than 45.5%.
In the embodiment, the limestone is pre-homogenized, so that the taste of the limestone is improved, the low-grade limestone can be fully utilized, the use of high-quality limestone is further reduced, the resource waste is reduced, and the production cost is saved.
In this embodiment, the threshold temperature is less than the constant temperature ThwAnd the difference is 5-20 ℃;
in another embodiment, step S5 may further determine that the preheating is completed in response to the temperature fluctuation rate K in the preheating bin being less than a preset value
The T isimaxIs the maximum value in the temperature data detected by the ith temperature detection module in the latest unit time TiminIs the minimum value in the temperature data detected by the ith temperature detection module in the latest unit time t
Similar to the bubbles floating upwards in the liquid, because the raw meal absorbs heat differently,the waste gas conveyed by the kiln exhaust equipment is in a gas cluster shape in the preheating cavity and continuously floats upwards, the temperature trend is reduced along with the heat absorption of raw material powder, the different time at the same position is equivalent to the measurement of atmosphere temperature values of different gas clusters, and the better fluctuation judgment is determined by the temperature difference between the gas cluster with the maximum temperature and the gas cluster with the minimum temperature; in the technical scheme, the method comprises the following steps
The temperature fluctuation rate is obtained, and the fluctuation of the temperature in the preheating bin is effectively represented.
In this example, the other materials include sandstone, converter slag, fly ash, and iron beneficiated sludge.
In this embodiment, the preheating chamber is further provided with a material spreading device 6.
In this embodiment, spill the material device and can guarantee that the material is in preheating indoor fully evenly the heat transfer, the more abundant the material contacts with steam, steam is better to the heating effect of material, energy-conserving effect is also better.
In this embodiment, the temperature of the rotary kiln during calcination is 1400 ℃ to 1600 ℃.
Note that, in fig. 2, the left part is a preheating state, and the right part is a preheating completion state.
Because the raw meal powder is solid powder, the temperature of the raw meal powder can not be directly measured, so the preheating condition is represented by adopting the atmosphere temperature, the raw meal powder in the preheating chamber is judged to be preheated uniformly by judging that the temperature reaches the threshold temperature or the fluctuation rate is lower than the temperature value which can be judged by the preset value, the calcination in the next step is facilitated, the utilization rate of energy and time can be effectively improved, and the quality of the produced cement is improved.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. A process for producing cement from low-grade lime, characterized in that the process comprises:
step S1, performing pre-homogenization treatment on the low-grade limestone, and grinding the low-grade limestone after the pre-homogenization treatment and other raw materials according to a preset proportion to prepare raw material powder;
step S2, pouring the raw meal into a preheating chamber for preheating, wherein the preheating chamber comprises a main body, a feeding bin, a conveying chute, a discharging device and at least two temperature detection modules, the feeding bin is arranged above the main body, the conveying chute is fixedly arranged in the main body and is positioned below the feeding bin, the discharging device is positioned below the inner part of the main body, the temperature detection modules are uniformly distributed in the main body and are positioned between the conveying chute and the discharging device, and the temperature detection modules are used for measuring the atmosphere temperature between the conveying chute and the discharging device;
step S3, starting kiln exhaust equipment to transmit gas into the preheating chamber and preheat; the temperature of the waste gas used for gas transmission is constant temperature Thw；
Step S4, obtaining atmosphere temperature data of the position of each temperature detection module in the latest unit time t;
step S5, when the atmosphere temperature data reaches the threshold temperature, the preheating is judged to be completed; the threshold temperature is less than a constant temperature Thw；
Step S6, feeding the preheated raw material powder into a rotary kiln for calcination to prepare clinker;
and step S7, mixing the clinker with other auxiliary materials in proportion and grinding the mixture to a certain fineness to prepare the cement.
2. The process for producing cement from low grade limestone as claimed in claim 1, wherein the low grade limestone content is 37% -42% during said pre-homogenization treatment, and the grade of the pre-homogenized limestone is not less than 45.5%.
3. Process for producing cement from low grade limestone as claimed in claim 1, wherein the threshold temperature is less than the constant temperature ThwAnd the difference is 5-20 ℃.
4. The process for producing cement from low-grade limestone as claimed in claim 1, wherein step S5 is further performed in response to the temperature fluctuation rate K in the preheating compartment being less than a preset value, to determine that preheating is completed; the above-mentioned
The T isimaxIs the maximum value in the temperature data detected by the ith temperature detection module in the latest unit time TiminIs the minimum value in the temperature data detected by the ith temperature detection module in the latest unit time t
5. The process for producing cement from low grade limestone as claimed in claim 1, wherein said other raw materials include sandstone, converter slag, fly ash and iron beneficiated sludge.
6. A process for producing cement from low grade limestone as claimed in claim 1 wherein said preheating chamber is further provided with a material spreading device.
7. The process for producing cement from low grade limestone as claimed in claim 1, wherein the temperature of the rotary kiln is 1400 ℃ to 1600 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010852404.9A CN112094062A (en) | 2020-08-22 | 2020-08-22 | Process for producing cement from low-grade limestone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010852404.9A CN112094062A (en) | 2020-08-22 | 2020-08-22 | Process for producing cement from low-grade limestone |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1529125A (en) * | 1976-04-06 | 1978-10-18 | Ishikawajima Harima Heavy Ind | Cement manufacturing process and apparatus |
| WO2001019750A1 (en) * | 1999-09-16 | 2001-03-22 | Alstom (Switzerland) Ltd. | Method of producing cement clinker and electricity |
| KR100804139B1 (en) * | 2006-12-19 | 2008-02-19 | 박영창 | Limestone kiln |
| CN108314338A (en) * | 2018-05-15 | 2018-07-24 | 葛洲坝松滋水泥有限公司 | A kind of low alkali portland cement clinker and preparation method thereof |
| CN110526605A (en) * | 2019-09-19 | 2019-12-03 | 广灵金隅水泥有限公司 | The method for preparing clinker using low-grade limestone |
-
2020
- 2020-08-22 CN CN202010852404.9A patent/CN112094062A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1529125A (en) * | 1976-04-06 | 1978-10-18 | Ishikawajima Harima Heavy Ind | Cement manufacturing process and apparatus |
| WO2001019750A1 (en) * | 1999-09-16 | 2001-03-22 | Alstom (Switzerland) Ltd. | Method of producing cement clinker and electricity |
| KR100804139B1 (en) * | 2006-12-19 | 2008-02-19 | 박영창 | Limestone kiln |
| CN108314338A (en) * | 2018-05-15 | 2018-07-24 | 葛洲坝松滋水泥有限公司 | A kind of low alkali portland cement clinker and preparation method thereof |
| CN110526605A (en) * | 2019-09-19 | 2019-12-03 | 广灵金隅水泥有限公司 | The method for preparing clinker using low-grade limestone |
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