CN209872794U - Production line for preparing high-alumina cement by using white mud - Google Patents
Production line for preparing high-alumina cement by using white mud Download PDFInfo
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- CN209872794U CN209872794U CN201920408621.1U CN201920408621U CN209872794U CN 209872794 U CN209872794 U CN 209872794U CN 201920408621 U CN201920408621 U CN 201920408621U CN 209872794 U CN209872794 U CN 209872794U
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- alumina cement
- white mud
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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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Abstract
A production line for preparing high-alumina cement by using white mud comprises a feeding device, a drying device, a calcining device, a heat collecting device, a dedusting device, a coal supply device, a combustion device and a milling device. The utility model can mix and calcine the white mud residue/carbide slag, the aluminum ash/aluminum raw material and the crystal nucleuses to prepare the high-aluminum cement, which not only can eliminate the white mud, but also can effectively protect the local beautiful natural ecological human living environment; the method has the advantages of accelerating the recycling of renewable resources, changing waste into valuable, turning harm into good, treating pollution, improving environment, releasing occupied land resources and the like, and can fully recycle heat generated in the production process and improve the working efficiency.
Description
Technical Field
The utility model relates to a waste recycling field especially indicates an utilize production line of white mud preparation high alumina cement.
Background
The white mud is derived from two sources, firstly, in the production process of the soda ash, a large amount of waste liquid is generated in the soda production by an ammonia-soda process, and the caustic sludge generated after the waste liquid is subjected to filter pressing is commonly called as the white mud. The other is that after the black liquor produced in the production process of paper-making pulping is treated by alkali recovery technology, lime is added into the green liquor to make causticization reaction so as to obtain white precipitate, i.e. white mud. The papermaking white mud reacts as follows:
Na2CO3+ CaO+ H2O =2NaOH+ CaCO3 ↓
the main chemical components are as follows:
| item | CaO | MgO | Fe2O3 | Al2O3 | SiO2 | Burning vector |
| Ratio (%) | 44.4-51.9 | 0.55-1.75 | 0.17-1.2 | 0.46-1.4 | 3.38-11 | 31.49-43 |
According to the national statistics, over 600 million tons of white mud are generated every year, and a lot of white mud is naturally stacked or buried, so that the dust content in the air is increased or the environmental pollution of soil and underground water is caused. Therefore, the problem of white mud treatment has been restricting the further development of soda ash industry and pulping and papermaking, and we need to overcome a big problem.
The applicant submits a Chinese invention patent in 2018, 05 and 28 days, namely a production line for preparing calcium aluminate powder by using white mud and a process thereof, and the production line discloses a method for preparing calcium aluminate powder by using white mud, wherein 0.4-0.5 part of white mud/carbide slag, 0.9-1.1 part of aluminum raw material and 0.04-0.05 part of crystal nucleus are sequentially conveyed into a stirrer to be mixed and uniformly stirred according to the parts by weight; then conveying the mixture to a rotary kiln for calcining for 20-40 min until the temperature of the mixture reaches 900-1100 ℃; after calcination, cooling the mixture to 300-400 ℃ by a cooling machine; after cooling, the mixture is ground by a first ball mill to prepare calcium aluminate powder. The utility model discloses a can eliminate white mud, effectively protect local graceful natural ecological human settlements environment for renewable resources recycle, changing waste into valuables, turning the harmful into the good, administer the pollution, improve the environment, release occupied land resource, can create graceful environment for people in addition, promote harmonious unified ecological environment of people and nature.
But this utility model has a defect, the mixture that obtains after the mixer stirring does not dry just send into the rotary kiln in and calcine promptly, and this has just led to this mixture can only cool off to 300 ~ 400 ℃, and work efficiency is lower, and is unfavorable for thermal recovery in later stage, can't realize the original intention of the energy-concerving and environment-protective of the applicant completely.
SUMMERY OF THE UTILITY MODEL
The utility model provides an utilize white mud to prepare production line of high alumina cement, its main aim at overcome the current technical efficiency who utilizes white mud to prepare high alumina cement lower and the defect of energy-concerving and environment-protective inadequately.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a production line for preparing high-alumina cement by using white mud comprises
A feeding device: the device comprises a white slime storage bin for containing white slime/carbide slag, an aluminum raw material storage bin for containing aluminum ash/aluminum raw materials, a crystal nuclide storage bin for containing crystal nuclides, a jaw crusher for crushing bauxite or aluminum ash with medium granularity, a fine crusher for finely crushing the bauxite or aluminum ash after crushing with medium granularity, a second ball mill for crushing the bauxite or aluminum ash after fine crushing into the aluminum raw materials, a stirrer for mixing the white slime/carbide slag, the aluminum ash/aluminum raw materials and the crystal nuclides, a forming machine connected with the outlet of the stirrer, and a belt conveyor for connecting the forming machine and drying equipment;
drying equipment: the drying machine is used for drying the raw material balls formed by the forming machine into dry material balls;
calcining equipment: the rotary kiln is used for calcining the dry material balls conveyed by the drying equipment;
a heat collecting device: the device comprises a cooler for cooling dry pellets calcined by a calcining device, and a heat transmission pipeline for transmitting heat collected when the cooler is cooled to a dryer;
dust removal equipment: the system comprises a tail gas adsorption tower, a cyclone dust collector, a pulse dust collector, an oxygen-enriched combustion boiler and an SNCR boiler;
coal supply equipment: the coal powder screening device comprises a coal mill for crushing coal blocks, a powder concentrator for screening coal powder, a spiral conveyor for conveying the coal powder, a coal powder bin connected with the output end of the spiral conveyor, and a pneumatic conveying pump for conveying the coal powder in the coal powder bin to combustion equipment;
a combustion apparatus: the rotary kiln comprises four-channel pulverized coal burners connected with the output ends of the pneumatic conveying pumps and a Roots blower for conveying hot air generated by the four-channel pulverized coal burners into the rotary kiln;
milling equipment: the high-alumina cement grinding device comprises a first ball mill and a high-alumina cement bin, wherein the first ball mill is used for crushing dry material balls cooled by the cooling machine to prepare high-alumina cement.
Furthermore, the heat collecting device also comprises a tail gas transmission pipeline for transmitting the tail gas generated by the calcining device to a dust removing device, a heat exchanger for cooling the tail gas in the tail gas transmission pipeline, and a hot gas transmission pipeline for transmitting the hot gas generated by the heat exchanger to a dryer.
Further, the rotary kiln is a waterfall type rotary kiln.
Further, the dryer is a vibrating boiling bed dryer.
Further, the stirrer is a vertical turbulent stirrer.
Compared with the prior art, the utility model discloses the beneficial effect who produces lies in:
the utility model can mix and calcine the white mud residue/carbide slag, the aluminum ash/aluminum raw material and the crystal nucleuses to prepare the high-aluminum cement, which not only can eliminate the white mud, but also can effectively protect the local beautiful natural ecological human living environment; the method has the advantages of accelerating the recycling of renewable resources, changing waste into valuable, turning harm into good, treating pollution, improving environment, releasing occupied land resources and the like, and can fully recycle heat generated in the production process and improve the working efficiency.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a block diagram of the flow of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Refer to fig. 1 and 2. A production line for preparing high-alumina cement by using white mud comprises a feeding device 1, a drying device 2, a calcining device 3, a heat collecting device 4, a dust removing device 5, a coal supply device 6, a combustion device 7 and a grinding device 8. Wherein the content of the first and second substances,
the feeding device 1 comprises a white mud residue bin 11 for containing white mud residue/carbide residue, an aluminum raw material bin 12 for containing aluminum ash/aluminum raw material, a crystal nucleus element bin 13 for containing crystal nuclide, a jaw crusher 14 for crushing bauxite or aluminum ash with medium granularity, a fine crusher 15 for finely crushing the bauxite or aluminum ash after crushing with medium granularity, a second ball mill 16 for crushing the bauxite or aluminum ash after fine crushing into the aluminum raw material, a stirrer 17 for mixing and stirring the white mud residue/carbide residue, the aluminum ash/aluminum raw material and the crystal nuclide, a forming machine 18 connected with the outlet of the stirrer, and a belt conveyor 19 for connecting the forming machine 18 with the drying device 2; in addition, according to the sizes of the white slime/carbide slag raw material and the crystal nuclein raw material, the white slime/carbide slag and the crystal nuclein with larger volumes can be selectively crushed in three stages by a jaw crusher, a fine crusher and a second ball mill in sequence; the agitator 17 is a vertical turbulent agitator.
The drying device 2 comprises a dryer 21 for drying the raw pellets formed by the forming machine 18 into dry pellets; the forming machine 18 is used for granulating and balling the mixture conveyed by the stirrer.
The calcining device 3 comprises a rotary kiln 31 for calcining the dry material balls conveyed by the drying device 2;
the heat collecting device 4 comprises a cooler 41 for cooling the dried pellets calcined by the calcining device, a heat transmission pipeline 42 for transmitting the heat collected when the cooler 41 is cooled to the dryer 21, an exhaust gas transmission pipeline 43 for transmitting the exhaust gas generated by the calcining device to the dust removing device, a heat exchanger 44 for cooling the exhaust gas in the exhaust gas transmission pipeline, and a hot gas transmission pipeline 45 for transmitting the hot gas generated by the heat exchanger to the dryer.
The dust removing device 5 comprises a tail gas adsorption tower 51, a cyclone dust remover 52, a pulse dust remover 53, an oxygen-enriched combustion boiler 54 and an SNCR boiler 55; the tail gas adsorption tower 51 can be a spray tower for adding alkali liquor; the concrete use is as follows: the tail gas generated by the rotary kiln 31 passes through a tail gas adsorption tower 51 to remove sodium sulfide therein, then sequentially passes through a cyclone dust collector 52 and a pulse dust collector 53 to remove dust in the tail gas, then enters an oxygen-enriched combustion boiler 54 for oxygen-enriched combustion, and finally enters an SNCR boiler 55 for reduction reaction, namely ammonia water or urea is added into the SNCR boiler 55 as a reducing agent, and NO in the tail gas is taken as a reducing agentXReduction to N2And water.
The coal supply equipment 6 comprises a coal mill 61 for crushing coal blocks, a powder concentrator 62 for screening coal powder, a spiral conveyor 63 for conveying the coal powder, a coal powder bin 64 connected with the output end of the spiral conveyor 63, and a pneumatic conveying pump 65 for conveying the coal powder in the coal powder bin 64 to the combustion equipment 7; the concrete use is as follows: the coal briquette is conveyed into a coal mill 61 through a vibrator machine for crushing, then conveyed to a powder concentrator 62 for screening after crushing, then conveyed to a coal powder bin 64 through a screw conveyor 63 for storage and standby after being subjected to dust removal treatment after screening, and then the coal powder in the coal powder bin 64 is conveyed into a combustion device 7 through a pneumatic conveying pump 65.
The combustion device 7 comprises a four-channel pulverized coal burner 71 connected with the output end of the pneumatic conveying pump 65 and a Roots blower 72 for transmitting hot air generated by the four-channel pulverized coal burner 71 into the rotary kiln 31;
the milling apparatus 8 includes a first ball mill 81 for pulverizing the dried pellets cooled by the cooler 41 to produce high alumina cement, and a high alumina cement silo 82 for accommodating the high alumina cement.
Refer to fig. 1 and 2. Specifically, the rotary kiln 31 is a cascade type rotary kiln. The fall type rotary kiln adopts a unique lining structure inside, so that the heat exchange efficiency of the kiln can be greatly improved, materials can fully contact with flame when turning over in the kiln, and the burning energy consumption is reduced; meanwhile, the material balls can become more compact in mutual extrusion, and the homogenization level and strength of the material balls are increased; the customized high-performance refractory heat-insulating material also greatly reduces the energy consumption loss caused by kiln skin heat dissipation; the wireless temperature measuring devices are uniformly distributed on the falling rotary kiln, the temperature of each area can be flexibly controlled, a flame monitoring system is arranged, the flame size and the air supply quantity can be automatically controlled according to the temperature requirement in the kiln, the combustion is more sufficient, the fuel consumption is reduced, the generation of nitrogen oxides is reduced, and the inherent mode of the traditional manual fire watching mode is changed.
Compared with the traditional rotary kiln, the falling rotary kiln with the same capacity specification has the length of only one third; the filling coefficient of the materials in the kiln is 18 percent, which is twice of the filling coefficient (9-14 percent) of the traditional rotary kiln.
The rotary kiln adopts an oxygen-enriched combustion process, so that the combustion speed can be increased, the complete combustion is promoted, the heat utilization rate is increased, and the air excess coefficient is reduced. Experiments prove that the adoption of the oxygen-enriched combustion technology can reduce the sintering time of the clinker balls by 20 percent, improve the yield, save the fuel by 20 percent and reduce the generation amount of smoke by 30 percent. During the sintering process, NO can be effectively preventedXThe generation of the energy-saving flue gas saves the flue gas treatment cost, and the comprehensive energy-saving effect is very considerable. The performance advantages are superposed, so that the energy consumption of the waterfall type rotary kiln is only 1/2 of the traditional rotary kiln. In addition, the advantage of the length of the falling rotary kiln is benefited, the production line is flexible in process layout and is slightly limited by land, factory buildings and the like, and the energy can be greatly savedSaving the occupied area and the civil engineering investment.
Refer to fig. 1 and 2. The dryer 21 is a vibrating ebullated bed dryer. Compared with the traditional drying equipment, the vibration fluidized bed dryer has the main advantages of high drying speed and high heat transfer efficiency on the premise of ensuring the drying quality of the material balls. The drying cycle of the drying equipment is only 3 minutes on average, and compared with the 2-hour drying cycle of the traditional belt type dryer, the efficiency is greatly improved; the heat source of the device comes from the waste heat of the production line, no additional heat source is needed, and the heat transfer coefficient can reach 95 percent.
Refer to fig. 1 and 2. The white slime storage bin 11, the aluminum raw material storage bin 12, the crystal nucleus material storage bin 13 and the coal powder storage bin 44 are all closed round bins, so that dust pollution is reduced.
Refer to fig. 1 and 2. A process for preparing high-alumina cement by using white mud comprises the following steps:
1) sequentially conveying 0.30-0.50 part of white mud residue/carbide slag, 0.50-1.10 parts of aluminum ash/aluminum raw material and 0.03-0.06 part of crystal nucleus element to a stirrer 17 for mixing and stirring uniformly;
2) after stirring, conveying the mixture to a forming machine 18 for granulation and balling, then conveying the formed raw material balls into a dryer 21 for drying, and drying to obtain dry material balls with the final water content of less than 2%;
3) feeding the dry pellets into a rotary kiln 31 for calcining for 25-45 min until the temperature of the mixture reaches 1300-1500 ℃;
4) after calcination, cooling the dry pellets to below 50 ℃ by a cooling machine 41;
5) the heat collected when the cooler 41 cools is transferred to the dryer 21 as a drying heat source;
6) after the dry material balls in the step 4 are cooled, the dry material balls are ground by a first ball mill 81 to prepare the high alumina cement.
Refer to fig. 1 and 2. The tail gas generated during the calcination in the rotary kiln 31 exchanges heat to clean air through the heat exchanger 43, and the clean air absorbs the heat and then becomes hot gas to be supplied to the dryer 21. And, after the heat and hot air collected by the cooler 41 are supplied to the dryer 21And the residual heat is conveyed to the polyaluminium chloride liquid for water mist drying to prepare polyaluminium chloride solid, so that the heat is fully utilized. After the tail gas is subjected to heat exchange through the heat exchanger 43, wet desulphurization is firstly adopted to carry out desulphurization treatment on the tail gas, and then an oxygen-enriched combustion method and an SNCR method are sequentially adopted to remove NO in the tail gasXReduction to N2And water. In addition, the surplus heat energy after the dryer 21 can be applied to the links of heating a workshop and the like.
In step 3, the calcination method of the rotary kiln 31 comprises the following steps: the coal briquette is crushed by the coal mill 61, screened by the powder concentrator 62, conveyed into the four-channel coal powder burner 71 by the pneumatic conveying pump 65 for combustion, and hot air generated after combustion is conveyed into the rotary kiln 31 for calcining dry pellets in the rotary kiln.
The preparation method of the aluminum raw material comprises the following steps: bauxite or aluminum ash with the aluminum trioxide content of more than 55 percent is taken, crushed with medium granularity by a jaw crusher 14, crushed with fine crusher 15 and crushed by a second ball mill 16 to prepare the aluminum raw material.
The carbide slag is waste slag which is obtained by hydrolyzing carbide to obtain acetylene gas and takes calcium hydroxide as a main component. More than 300 kg of acetylene gas can be generated by adding water into 1t of calcium carbide, and 10t of industrial waste liquid with the solid content of about 12 percent is generated at the same time, and is commonly called as calcium carbide slurry. The calcium carbide slag is effectively utilized, so that good economic benefits, environmental benefits and social benefits can be brought, waste can be changed into valuable things, but the existing recycling method cannot fully utilize the calcium carbide slag, and in the process, the calcium carbide slag and the white sludge slag can be fully utilized to prepare the high-alumina cement.
The utility model can mix and calcine the white mud residue/carbide slag, the aluminum ash/aluminum raw material and the crystal nucleuses to prepare the high-aluminum cement, which not only can eliminate the white mud, but also can effectively protect the local beautiful natural ecological human living environment; accelerating the recycling of renewable resources, changing waste into valuables, turning harm into good, treating pollution, improving the environment, releasing occupied land resources and other advantages, fully recovering heat generated in the production process, improving the working efficiency, only 6-11 persons are needed for the configuration of production line operators, so that the possibility of accidents and manual misoperation can be avoided to the maximum extent, the labor intensity can be greatly reduced, and the personnel demands can be reduced.
The above-mentioned be the utility model discloses a concrete implementation way, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.
Claims (5)
1. The utility model provides an utilize production line of white mud preparation high alumina cement which characterized in that: comprises that
A feeding device: the device comprises a white slime storage bin for containing white slime/carbide slag, an aluminum raw material storage bin for containing aluminum ash/aluminum raw materials, a crystal nuclide storage bin for containing crystal nuclides, a jaw crusher for crushing bauxite or aluminum ash with medium granularity, a fine crusher for finely crushing the bauxite or aluminum ash after crushing with medium granularity, a second ball mill for crushing the bauxite or aluminum ash after fine crushing into the aluminum raw materials, a stirrer for mixing the white slime/carbide slag, the aluminum ash/aluminum raw materials and the crystal nuclides, a forming machine connected with the outlet of the stirrer, and a belt conveyor for connecting the forming machine and drying equipment;
drying equipment: the drying machine is used for drying the raw material balls formed by the forming machine into dry material balls;
calcining equipment: the rotary kiln is used for calcining the dry material balls conveyed by the drying equipment;
a heat collecting device: the device comprises a cooler for cooling dry pellets calcined by a calcining device, and a heat transmission pipeline for transmitting heat collected when the cooler is cooled to a dryer;
dust removal equipment: the system comprises a tail gas adsorption tower, a cyclone dust collector, a pulse dust collector, an oxygen-enriched combustion boiler and an SNCR boiler;
coal supply equipment: the coal powder screening device comprises a coal mill for crushing coal blocks, a powder concentrator for screening coal powder, a spiral conveyor for conveying the coal powder, a coal powder bin connected with the output end of the spiral conveyor, and a pneumatic conveying pump for conveying the coal powder in the coal powder bin to combustion equipment;
a combustion apparatus: the rotary kiln comprises four-channel pulverized coal burners connected with the output ends of the pneumatic conveying pumps and a Roots blower for conveying hot air generated by the four-channel pulverized coal burners into the rotary kiln;
milling equipment: the high-alumina cement grinding device comprises a first ball mill and a high-alumina cement bin, wherein the first ball mill is used for crushing dry material balls cooled by the cooling machine to prepare high-alumina cement.
2. The production line for preparing high-alumina cement by using white mud as claimed in claim 1, is characterized in that: the heat collecting device also comprises a tail gas transmission pipeline for transmitting the tail gas generated by the calcining device to the dust removing device, a heat exchanger for cooling the tail gas in the tail gas transmission pipeline, and a hot gas transmission pipeline for transmitting the hot gas generated by the heat exchanger to the dryer.
3. The production line for preparing high-alumina cement by using white mud as claimed in claim 1, is characterized in that: the rotary kiln is a waterfall type rotary kiln.
4. The production line for preparing high-alumina cement by using white mud as claimed in claim 1, is characterized in that: the dryer is a vibrating fluidized bed dryer.
5. The production line for preparing high-alumina cement by using white mud as claimed in claim 1, is characterized in that: the stirrer is a vertical turbulent stirrer.
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| CN201920408621.1U CN209872794U (en) | 2019-03-28 | 2019-03-28 | Production line for preparing high-alumina cement by using white mud |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156356A (en) * | 2019-03-28 | 2019-08-23 | 福建鼎盛元环保科技有限公司 | A kind of production line and its technique preparing high alumina cement using white clay |
| CN114538489A (en) * | 2022-03-18 | 2022-05-27 | 四川轻化工大学 | Method and system for preparing efficient powdery accelerator from aluminum ash |
| CN114920474A (en) * | 2022-04-21 | 2022-08-19 | 山东大学 | Method for preparing new mineral system high-temperature cement by using aluminum ash and carbide slag |
-
2019
- 2019-03-28 CN CN201920408621.1U patent/CN209872794U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156356A (en) * | 2019-03-28 | 2019-08-23 | 福建鼎盛元环保科技有限公司 | A kind of production line and its technique preparing high alumina cement using white clay |
| CN114538489A (en) * | 2022-03-18 | 2022-05-27 | 四川轻化工大学 | Method and system for preparing efficient powdery accelerator from aluminum ash |
| CN114920474A (en) * | 2022-04-21 | 2022-08-19 | 山东大学 | Method for preparing new mineral system high-temperature cement by using aluminum ash and carbide slag |
| CN114920474B (en) * | 2022-04-21 | 2022-11-29 | 山东大学 | Method for preparing new mineral system high-temperature cement by using aluminum ash and carbide slag |
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