CN214115367U - System for refining slag preparation cement raw materials - Google Patents

System for refining slag preparation cement raw materials Download PDF

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Publication number
CN214115367U
CN214115367U CN202022218130.6U CN202022218130U CN214115367U CN 214115367 U CN214115367 U CN 214115367U CN 202022218130 U CN202022218130 U CN 202022218130U CN 214115367 U CN214115367 U CN 214115367U
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Prior art keywords
powder concentrator
dust collector
bucket elevator
grinding
refining slag
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Expired - Fee Related
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CN202022218130.6U
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Chinese (zh)
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梁晓杰
朱先胜
范振鹏
丁永刚
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Rizhao Steel Holding Group Co Ltd
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Rizhao Steel Holding Group Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

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Abstract

The utility model discloses a system for refining slag preparation cement raw materials belongs to refining slag processing field, hot splashing unit, magnetic separation unit, carbonation unit, grinding unit including refining slag. Compared with the prior art, the utility model solves the difficult problems of the steel industry that the refining slag is difficult to treat and use, and realizes the comprehensive utilization of the metallurgical waste slag; energy conservation and environmental protection, and can reduce the production cost of cement.

Description

System for refining slag preparation cement raw materials
Technical Field
The utility model relates to a system, especially a system that is applicable to preparation cement raw materials behind the carbonation preliminary treatment of LF stove refining slag are recycled to refining slag.
Background
At present, in cement production, the allowed mixed materials in national standards mainly comprise slag, pozzolanic mixed materials, fly ash, limestone and the like, but the cost of the slag, the fly ash and the limestone is greatly increased due to continuous rising of the resource shortage price, and some enterprises try to produce steel slag cement by adding steel slag. But the steel slag cement has the following defects in the production: firstly, the steel slag is easy to grind and poor in grindability, so that the steel slag is used as a cement mill mixed material, the machine-hour yield of the mill is reduced by 20-30t/h, and the power consumption of cement is increased; secondly, the steel slag has the characteristic of retarding when added into the cement, so that the setting time of the cement is prolonged, the quality fluctuation of the cement is large, and the market feedback effect is poor.
The LF refining slag is a byproduct generated in the refining process of the LF furnace, has good grindability and contains 35% of calcium materials. Because the slag-making materials such as active lime, bauxite, silica and the like added in the molten steel refining process of the LF furnace are generated at high temperature, the phase composition of the waste slag after refining is relatively complex, and most of the waste slag is C2S and Ca (OH)2In which a very small proportion is present in the form of free CaO. The free CaO does not react with other components in the smelting process, a small part still exists in an unmelted solid state particle shape, and has the characteristics of easy expansion and the like, and the utilization rate is relatively low. And due to the reasons of higher activity of CaO in the slag, lower hydration activity of free CaO and the like, the volume expansion of the LF refining slag is easily caused, so that the application of the LF refining slag in the production of building materials and cement is limited. Because of the defects of slow early hydration speed, overlong initial setting and final setting time and low early strength, the prior recycling is only limited to paving, for example, in the invention patent application CN201510899782.1, namely an environment-friendly cement-based material for a pavement base, fine powder is obtained by crushing, deironing and grinding refined slag and is used as a raw material to be doped. The potential hydraulic gelation property of the refining slag is not reasonably utilized, the hydration defect of free calcium oxide is overcome, the strength support of the system is improved, the characteristic of easy expansion is relieved, the technical problems of overlong initial setting and final setting time and low early strength are solved, the proportion of the converter steel slag in a cement structural system is improved to a certain extent, and the key for improving the utilization rate of the LF refining slag is realized.
SUMMERY OF THE UTILITY MODEL
The technical task of the utility model is not enough to above prior art, provides the system of refining slag preparation cement raw materials to carbonation technology preliminary treatment is the technological core, has solved the steel industry difficult problem that the refining slag is difficult to handle the use, solves building materials enterprises such as cement, concrete simultaneously and produces the mixed material raw materials that are in short supply at present, reduces the manufacturing cost of cement. And innovative breakthrough is made on the treatment of solid wastes.
The technical proposal of the utility model for solving the technical problem is that: the system for preparing the cement raw material by the refining slag is characterized in that: comprises a refining slag hot splashing unit, a magnetic separation unit, a carbonation unit and a grinding unit; the refining slag hot splashing unit comprises a slag pit and a water supply system; the magnetic separation unit comprises a steel slag magnetic separator; the carbonation unit comprises a carbonation reaction kettle; the grinding unit comprises a first circulating system, a second circulating system and a cyclone dust collector; the first circulating system comprises a grinding belt, a first bucket elevator, a V-shaped powder concentrator, a middle bin, a roller press and a first powder concentrator; the lower part of the terminal of the grinding belt is over against the feeding hole of the first bucket elevator, the lower part of the discharging hole of the first bucket elevator is over against the feeding hole of the V-shaped powder concentrator, the coarse material outlet of the V-shaped powder concentrator is sequentially connected with the middle bin, the roller press and the first bucket elevator feeding hole through pipelines, and the fine material outlet of the V-shaped powder concentrator is connected with the feeding hole of the first powder concentrator through a pipeline; the second circulating system comprises a ball mill, a second powder concentrator, a second bucket elevator, a grinding dust collector connected with a tail grinding fan, a main dust collector connected with a main exhaust fan and a cyclone dust collector connected with a circulating fan; the feed inlet of the ball mill is connected with the coarse material outlet of the first powder concentrator through a pipeline; one path of a discharge hole of the ball mill is connected with a grinding dust collector through a pipeline, and the other path of the discharge hole of the ball mill is connected with a feed inlet of a second bucket elevator through a conveyor; an outlet of the grinding dust collector is connected with a feed inlet of the second bucket elevator through a conveyor; the discharge hole of the second bucket elevator is connected with the feed inlet of the second powder concentrator; a fine material outlet of the second powder concentrator, the main dust collector and the conveying chute are sequentially connected through pipelines, and a coarse material outlet is connected with a feed inlet of the ball mill through a conveyor; an air inlet of the cyclone dust collector is connected with a fine material outlet of the first powder concentrator; the fine material discharge port of the cyclone dust collector, the conveying chute and the feed port of the warehousing bucket elevator are sequentially connected; and an exhaust pipe of the cyclone dust collector is respectively connected with air inlets of the V-shaped powder concentrator and the second powder concentrator through a pipeline with a valve and a circulating fan.
The reaction kettle is internally provided with a water spray device and a stirring device.
Compared with the prior art, the utility model discloses following outstanding beneficial effect has:
1. environmental protection benefit: the process takes carbonation process pretreatment as a technical core, and carries out hot splashing, magnetic separation and carbonation pretreatment processes on the LF refining slag, thereby solving the difficult problems of the steel industry that the refining slag is difficult to treat and use and realizing the comprehensive utilization of metallurgical waste slag;
2. direct energy benefit: through the pretreatment of the process, the stand hour of a cement mill is increased from 160 t/to 180t/h, the unit consumption of electricity in the cement is reduced from 33kwh/t to 31kwh/t, and the calculated economic benefit is (33-31). times.200X 0.52-208 ten thousand yuan according to the annual production of 200 ten thousand tons of cement and the unit price of 0.52 yuan/kwh.
3. Direct dosing cost benefit: the cement is mixed according to 6 percent of the refining slag to replace the steel slag with the same proportion, the unit price of the refining slag is 0.089 yuan/ton, the price of the steel slag is 5 yuan/ton, the addition amount of the refining slag is 12 million tons according to 200 million tons of cement produced every year, and the direct batching cost of the cement reduced by the refining slag is (5-0.089) multiplied by 200 which is 982.2 million yuan. Solves the problem that building material enterprises such as cement, concrete and the like currently produce scarce mixed material raw materials, and reduces the production cost of cement.
Drawings
Fig. 1 is a flow chart of the structure of the present invention.
Fig. 2 is a process flow diagram of the grinding unit of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
As shown in figure 1, the utility model comprises a refining slag hot splashing unit, a magnetic separation unit, a carbonation unit and a grinding unit.
The refining slag hot splashing unit comprises a slag pit and a water supply system. When in use, the LF liquid slag is directly splashed to the slag pit, the waste heat of the steel slag is utilized, and water is sprayedAfter cooling, under the action of expansion with heat and contraction with cold and the hydrolytic expansion of free calcium oxide, the steel slag is broken, self-decomposed and powdered. Wherein in the refining slag hot splashing treatment process, the thickness of the refining slag layer is controlled at 40cm, the watering time is 30min, and the water quantity is controlled at 30m3. The time for water injection, digestion and aging is 7 days, the free calcium oxide content in the LF refining slag can be reduced to be within 2% by the unit process steps, and the problem of volume expansion of the LF refining slag is effectively solved.
The magnetic separation unit comprises a steel slag magnetic separator and is used for carrying out magnetic separation treatment on the refining slag after hot splashing treatment so as to separate scrap iron mixed in the refining slag. After magnetic separation treatment, the water content is controlled to be 6-8%, the content of metallic iron is controlled to be less than or equal to 2%, and the obtained product is used as a raw material for carbonation pretreatment.
The carbonation unit comprises a carbonation reaction kettle. The reaction kettle is a cylinder with the diameter of 3m and the length of 6m, and the end part of the reaction kettle is provided with a sealing cover. Adding the refined slag after magnetic separation into a carbonation reaction kettle, introducing flue gas required by carbonation reaction from flue gas discharged by a slag vertical mill hot blast stove, and CO in the flue gas2The content is 40-50%, and the rest is 40% of N2Control of SO2And NOXThe total content of the smoke is less than 3 percent, and the smoke is introduced into a carbonation reaction kettle in a pipeline mode. Uniformly paving the refining slag in a reaction disc, controlling the paving thickness to be 5cm, introducing flue gas into a carbonation reaction kettle through an induced draft fan, stably controlling the pressure in the reaction kettle to be 0.6-0.7 MPa, and controlling the reaction time to be 2 hours to carry out carbonation reaction on the refining slag. After the reaction is finished, stopping supplying the flue gas, pumping out the flue gas in the kettle by using a fan, balancing to atmospheric pressure, opening the reaction kettle, and transporting to a stock ground for later use through a belt. In the optimized scheme, the device also comprises a water spray device and a stirring device, and aims to control the moisture of the refining slag to be 8% -10%, wherein the humidity range is favorable for the reaction of carbonation. The reaction temperature is introduced from slag hot blast furnace flue gas or lime kiln flue gas, and the temperature of the flue gas is 85-90 ℃. The hot splashing process of the refining slag can not completely digest CaO, 6 to 8 percent of free CaO with low activity still exists, and the CaO contains Ca (OH) generated by hydrolysis reaction2And coagulation of silicateGlue (C-S-H) and other substances have basic conditions of carbonation reaction, under the pressure environment of 0.6MPa to 0.7MPa and the temperature condition of 85 ℃ to 90 ℃, mixed smoke with the CO2 content of 40 percent to 50 percent is adopted, on one hand, the reaction conditions can be improved, the carbonation reaction of CaO, Ca (OH)2, silicate gel (C-S-H) and other substances is promoted, calcium carbonate crystals with the crystal size of about 500nm are generated, the calcium carbonate crystals are used as a crystal nucleus effect, the early hydration reaction of cement clinker is promoted, the calcium carbonate aluminate hydrate is generated, and the conversion of Aft in cement hardening slurry to AFm is inhibited; on the other hand, the flue gas can be reused, and the energy-saving requirement is met. If the sulfur dioxide in the used flue gas exceeds 100ppm, the carbonation reaction can be inhibited, therefore, if the sulfur dioxide in the flue gas exceeds the standard, the flue gas is firstly desulfurized in the optimization scheme, the temperature of the desulfurized flue gas is not lower than 80 ℃, and the moisture content is less than or equal to 10%.
The grinding unit comprises a first circulating system and a second circulating system.
As shown in fig. 2, the first circulation system comprises a grinding belt 1, a first hopper 2, a V-shaped powder concentrator 3, an intermediate bin 4, a roller press 5 and a first powder concentrator 6. The lower part of the terminal of the grinding belt 1 is over against the feeding hole of the first bucket elevator 2, the lower part of the discharge hole of the first bucket elevator 2 is over against the feeding hole of the V-shaped powder concentrator 3, the coarse material outlet of the V-shaped powder concentrator 3 is sequentially connected with the middle bin 4, the roller press 5 and the feeding hole of the first bucket elevator 2 through pipelines, and the fine material outlet of the V-shaped powder concentrator 3 is connected with the feeding hole of the first powder concentrator 6 through pipelines.
The second circulating system comprises a ball mill 7, a second powder concentrator 8, a second bucket elevator 9, a grinding dust collector 11 connected with a tail grinding fan 10, a main dust collector 13 connected with a main exhaust fan 12, and a cyclone dust collector 15 connected with a circulating fan 14.
And a feed inlet of the ball mill 7 is connected with a coarse material outlet of the first powder concentrator 6 through a pipeline. One path of a discharge hole of the ball mill 7 is connected with a grinding dust collector 11 through a pipeline, and the other path of the discharge hole is connected with a feed inlet of the second bucket elevator 9 through a conveyor. And the outlet of the grinding dust collector 11 is connected with the feed inlet of the second bucket elevator 9 through a conveyor. And the discharge hole of the second bucket elevator 9 is connected with the feed inlet of a second powder concentrator 8(O-SEPA high-efficiency powder concentrator). The fine material outlet of the second powder concentrator 8, the main dust collector 13, the conveying chute 16 and the feed inlet of the warehousing bucket elevator 17 are sequentially connected through pipelines, and the coarse material outlet is connected with the feed inlet of the ball mill 7 through a conveyor.
And an air inlet of the cyclone dust collector 15 is connected with a fine material outlet of the first powder concentrator 6. The fine material discharge port of the cyclone dust collector 15, the conveying chute 16 and the feed port of the warehousing bucket elevator 17 are sequentially connected. And an exhaust pipe of the cyclone dust collector 15 is respectively connected with air inlets of the V-shaped powder concentrator 3 and the second powder concentrator 8 through a pipeline with a valve and a circulating fan 14. When the cyclone dust collector 15 works, slag materials are separated from air by the cyclone dust collector 15, and the air enters the V-shaped powder concentrator 3 and the second powder concentrator 8 through pipelines respectively, so that the air inlet amount of the powder concentrators is increased, the air can be recycled, the working efficiency of the powder concentrators is improved, the utilization rate of a fan is reduced, and the energy consumption is saved. And the valve on the pipeline can control the air inlet quantity and adjust the air inlet quantity of the powder concentrator. Meanwhile, one of the valves can be selectively opened/closed according to the material demand by the design of the pipeline and the valve, and the material rolling/ball milling circulation direction is changed.
The refining slag after carbonation pretreatment is transported into a material shed by an automobile, is loaded into a storage bin by a forklift, is metered by a belt weigher, is lifted by a first bucket 2 through a grinding belt 1 together with other raw materials, enters a V-shaped powder concentrator 3 after being lifted by the first bucket 2, is introduced into the powder concentrator by the wind power of a circulating fan 14, and fine powder in the V-shaped powder concentrator 3 is introduced into the powder concentrator, and coarse powder enters a middle bin 4 of a roller press 5 and then enters a roller press 5, is crushed by double rollers of the roller press 5 and then enters the first bucket 2 again, so that the coarse powder forms a first circulating system.
The fine powder in the V-shaped powder concentrator 3 enters a first powder concentrator 6, is separated by the powder concentrator, is collected by a cyclone dust collector 15 to be used as a finished product, is conveyed by a chute and then enters a finished product warehouse by bucket lifting.
After coarse powder selected by the first powder selecting machine 6 enters the ball mill 7 for grinding, under the drive of the tail grinding fan 10, the material is lifted by the second bucket elevator 9 after being discharged from the mill, enters the second powder selecting machine 8, qualified fine powder is selected, the qualified fine powder is collected by the main dust collector 13 along with the wind power of the main exhaust fan 12 to become qualified products, and the qualified products enter the finished product warehouse through the conveying chute 16 and the warehouse bucket elevator 17.
And the unqualified coarse powder enters the ball mill 7 again for grinding to form a second circulating system.
The refining tailings powder after carbonation pretreatment has good grindability, so the refining tailings introduced into the cement ball mill can improve the operation stability of the cement roller press and improve the machine-hour yield of the mill.
The process the utility model discloses the intermediate product that forms after the system treatment can regard as the cement raw materials, according to weighing the measurement back through the measurement with slag powder and other batching, forms final product cement after carrying out the misce bene in the compounding machine, realizes that the integrated processing of LF stove refining slag is used.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.

Claims (2)

1. The system for preparing the cement raw material by the refining slag is characterized in that: comprises a refining slag hot splashing unit, a magnetic separation unit, a carbonation unit and a grinding unit; the refining slag hot splashing unit comprises a slag pit and a water supply system; the magnetic separation unit comprises a steel slag magnetic separator; the carbonation unit comprises a carbonation reaction kettle; the grinding unit comprises a first circulating system, a second circulating system and a cyclone dust collector; the first circulating system comprises a grinding belt, a first bucket elevator, a V-shaped powder concentrator, a middle bin, a roller press and a first powder concentrator; the lower part of the terminal of the grinding belt is over against the feeding hole of the first bucket elevator, the lower part of the discharging hole of the first bucket elevator is over against the feeding hole of the V-shaped powder concentrator, the coarse material outlet of the V-shaped powder concentrator is sequentially connected with the middle bin, the roller press and the first bucket elevator feeding hole through pipelines, and the fine material outlet of the V-shaped powder concentrator is connected with the feeding hole of the first powder concentrator through a pipeline; the second circulating system comprises a ball mill, a second powder concentrator, a second bucket elevator, a grinding dust collector connected with a tail grinding fan, a main dust collector connected with a main exhaust fan and a cyclone dust collector connected with a circulating fan; the feed inlet of the ball mill is connected with the coarse material outlet of the first powder concentrator through a pipeline; one path of a discharge hole of the ball mill is connected with a grinding dust collector through a pipeline, and the other path of the discharge hole of the ball mill is connected with a feed inlet of a second bucket elevator through a conveyor; an outlet of the grinding dust collector is connected with a feed inlet of the second bucket elevator through a conveyor; the discharge hole of the second bucket elevator is connected with the feed inlet of the second powder concentrator; a fine material outlet of the second powder concentrator, the main dust collector and the conveying chute are sequentially connected through pipelines, and a coarse material outlet is connected with a feed inlet of the ball mill through a conveyor; an air inlet of the cyclone dust collector is connected with a fine material outlet of the first powder concentrator; the fine material discharge port of the cyclone dust collector, the conveying chute and the feed port of the warehousing bucket elevator are sequentially connected; and an exhaust pipe of the cyclone dust collector is respectively connected with air inlets of the V-shaped powder concentrator and the second powder concentrator through a pipeline with a valve and a circulating fan.
2. The system for preparing cement raw material by refining slag according to claim 1, characterized in that: the reaction kettle is internally provided with a water spray device and a stirring device.
CN202022218130.6U 2020-09-30 2020-09-30 System for refining slag preparation cement raw materials Expired - Fee Related CN214115367U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117900135A (en) * 2024-03-20 2024-04-19 江苏宇梦环保科技有限公司 Combined multiple powder selecting process and system thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117900135A (en) * 2024-03-20 2024-04-19 江苏宇梦环保科技有限公司 Combined multiple powder selecting process and system thereof
CN117900135B (en) * 2024-03-20 2024-06-11 江苏宇梦环保科技有限公司 Combined multiple powder selecting process and system thereof

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Granted publication date: 20210903