CN212560011U - Multistage broken ultrafine powder preparation facilities that grinds of slag - Google Patents
Multistage broken ultrafine powder preparation facilities that grinds of slag Download PDFInfo
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- CN212560011U CN212560011U CN202021598722.9U CN202021598722U CN212560011U CN 212560011 U CN212560011 U CN 212560011U CN 202021598722 U CN202021598722 U CN 202021598722U CN 212560011 U CN212560011 U CN 212560011U
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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
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Abstract
The utility model relates to a multistage broken ultrafine powder preparation facilities that grinds of slag, the device includes: the steel slag tailing recycling device comprises a steel slag tailing bin (1), a rod-grinding slag-breaking machine (2), a belt line No. 1 (3), an electromagnetic roller iron-removing machine (4), a magnetic separation powder 1 bin (5), a double-roller slag-breaking machine (6), a disc type magnetic separator (7), a magnetic separation powder 2 bin (8), a belt line No. 2 (9), a vertical slag-grinding machine (10), a strong magnetic separator (11), a magnetic separation powder 3 bin (12), a bucket elevator (13), a hot blast stove (14), a dust remover (15) and a finished product bin (16).
Description
Technical Field
The utility model relates to a multistage broken ultrafine powder preparation facilities that grinds of slag, especially a device that steel enterprise's slag tailings carries out multistage breakage, magnetic separation, grinding preparation superfine powder.
Background
About 0.12-0.14 tons of steel slag is generated per 1 ton of steel, the generation amount of the steel slag in China in 2019 is about 1.3 hundred million tons, and the utilization rate is 30%. A large amount of steel slag tailings cannot be recycled, the newly increased steel slag stacking amount is more than 8000 million tons every year, the accumulated stacking amount is more than 10 hundred million tons, and a large amount of land is occupied, and environmental safety hazards such as water system pollution, soil pollution and the like exist.
The main chemical components of the steel slag comprise CaO and SiO2、FeO、Fe2O3And the like. The content of CaO in the ordinary converter steel slag is about 40 percent, and the content of SiO is215-20%, iron oxide content of 20-25%, and 5-10% of metallic iron. The steel slag is mainly composed of dicalcium silicate (2 CaO. SiO)2) Tricalcium silicate (3 CaO. SiO)2) OliveStone (CaO, RO, SiO)2) Multiflora rose pyroxene (3 CaO. RO. 2 SiO)2) And RO phase (solid solution of MgO, MnO, FeO). The steel slag has two resource recovery values of iron and calcium silicate in terms of chemical composition, and has great economic and social values if all the resources are utilized.
5-10% of residual steel in the steel slag is usually partially recycled through grinding and magnetic separation, the obtained steel scrap and magnetic separation powder flow into a metallurgical process, and the residual steel slag tailings with the content of nearly 80% cannot be utilized with high added value. Related research and production practices show that only part of the steel slag tailings flows into the cement industry at the price of 3-10 yuan/ton and is used as an iron correcting agent or an admixture of cement and concrete. The existing production enterprises usually pay attention to the recovery of iron resources, and the utilization of tailings resources cannot be paid enough attention to iron and steel enterprises due to various difficulties of economy, technology and the like.
Since steel slag contains a large amount of minerals with hydraulic gel properties such as dicalcium silicate and tricalcium silicate and the like, and the components of the minerals are close to those of cement, research and development of steel slag cement have been carried out in units such as the institute of metallurgical construction and research since the last 60 years. Until now, the application of steel slag as a cementing material is still a main utilization way with a large batch and a certain added value. The smelting temperature of the steel slag is about 1650 ℃, and the sintering temperature of the portland cement clinker is about 1450 ℃. High formation temperature of steel slag to cause C3S and C2S has compact crystallization, low hydration speed, low early strength and good later strength, and the later strength of the cementing material added with a certain amount of steel slag powder is even higher than that of portland cement clinker. At present, the production capacity of the steel slag powder in China is about 1100 ten thousand tons/year, and the steel slag powder is applied to industrial and civil buildings, and relevant practices show that the application of the steel slag powder has no safety problem.
The production of the steel slag powder mainly comprises four production processes of ball milling, roller press plus ball milling, vertical milling and horizontal roller milling, but the problems of high grinding energy consumption, large equipment abrasion, high maintenance frequency, low product activity and the like generally exist, so that the steel slag powder cannot be popularized and applied on a large scale. Briefly, two aspects of high energy consumption and low activity index of steel slag grinding are key factors for restricting the market popularization work of the steel slag powder. Because the steel slag contains a large amount of iron elements, RO phase and minerals with slow hydration of olivine substances, and the content of tricalcium silicate in the steel slag is relatively low, the activity index of a steel slag cementing material product is low. Meanwhile, because of metal iron and other substances with high hardness in the steel slag, the energy consumption for grinding the steel slag is high. Therefore, the existence of iron element in the steel slag is the main source influencing high energy consumption and low activity index of steel slag grinding. The development needs to urgently develop a novel steel slag grinding process and complete equipment, reduce the energy consumption cost of steel slag grinding and improve the activity index of steel slag powder.
The application of the steel slag in preparing the powder material is an effective way for large-scale, high-added-value and large-scale application of the steel slag, and is a necessary way for recycling the steel slag. The cement yield in China is 23.3 hundred million tons, the concrete is about 25 hundred million parts, and 8000 ten thousand tons of steel slag tailings which cannot be utilized every year can be completely consumed by being used as an admixture of the cement and the concrete only by being doped in a proportion of 2-5%. The utility model discloses a brand-new processing technology and complete sets to slag ferruginous material characteristic, adopt the multistage broken process technology route of grinding of slag to prepare the superfine powder, have production energy consumption low, the active index is high, characteristics such as iron resource rate of recovery height. The new process for treating the steel slag can obtain greater economic benefit.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a multistage broken superfine powder preparation facilities that grinds of slag, multistage broken superfine powder preparation facilities that grinds of slag includes: the device comprises a steel slag tailing bin (1), a rod grinding slag breaking machine (2), a belt line No. 1 (3), an electromagnetic roller iron remover (4), a magnetic separation powder 1 bin (5), a double-roller slag breaking machine (6), a disc type magnetic separator (7), a magnetic separation powder 2 bin (8), a belt line No. 2 (9), a vertical slag grinding machine (10), a strong magnetic separator (11), a magnetic separation powder 3 bin (12), a bucket elevator (13), a hot blast stove (14) and a dust remover (15), preferably a bag-type dust remover (15) and a finished product bin (16), wherein steel slag tailings are stacked in the steel slag tailing bin (1), and can be sent to the rod grinding slag breaking machine (2) for primary crushing treatment; the starting end of the belt line No. 1 (3) is positioned below the rod mill slag breaker (2), and the terminal of the belt line No. 1 (3) is positioned above the electromagnetic roller iron remover (4) and is used for conveying the steel slag tailings crushed by the rod mill slag breaker (2) to the electromagnetic roller iron remover (4) for magnetic separation treatment; the magnetic separation powder 1 bin (5) is arranged below the electromagnetic roller iron remover (4) and is used for enabling magnetic separation powder obtained by magnetic separation of the electromagnetic roller iron remover (4) to fall into the magnetic separation powder 1 bin (5); the pair-roller slag breaking machine (6) is arranged below the electromagnetic roller iron remover (4) and is used for enabling nonmagnetic steel slag tailings obtained after the magnetic separation of the electromagnetic roller iron remover (4) to fall into the pair-roller slag breaking machine (6) for secondary crushing treatment; the disc type magnetic separator (7) is arranged below the double-roller slag crusher (6) and is used for enabling the steel slag tailings obtained by secondary crushing treatment of the double-roller slag crusher (6) to fall into the disc type magnetic separator (7) for secondary magnetic separation treatment; the magnetic separation powder 2 bin (8) is arranged below the disc type magnetic separator (7) and is used for enabling magnetic separation powder obtained through magnetic separation of the disc type magnetic separator (7) to fall into the magnetic separation powder 2 bin (8); the starting end of the No. 2 belt line (9) is arranged below the disc type magnetic separator (7), and the terminal end of the No. 2 belt line (9) is arranged above the vertical slag grinding machine (10) and is used for conveying nonmagnetic steel slag tailings obtained through magnetic separation of the disc type magnetic separator (7) to the vertical slag grinding machine (10) for superfine grinding; the strong magnetic separator (11) is arranged below the vertical slag mill (10), and the magnetic separation powder 3 bin (12) is arranged below the strong magnetic separator (11) and used for discharging magnetic separation powder obtained by performing strong magnetic separation on circulating materials generated in the grinding process through the strong magnetic separator (11) and falling into the magnetic separation powder 3 bin (12); the bucket elevator (13) is arranged beside the vertical slag mill (10), is connected with the discharge end of the circulating material subjected to magnetic separation of the strong magnetic separator (11) and the feed end of the vertical slag mill (10), and is used for conveying the circulating material subjected to magnetic separation into the vertical slag mill (10) through the bucket elevator (13) for circulating grinding until the fineness is qualified; the hot blast stove (14) is connected with the vertical slag grinding machine (10) through a pipeline and is used for providing hot air for drying the steel slag tailings and/or the circulating materials entering the vertical slag grinding machine (10); the dust remover (15) is connected with the vertical slag grinder (10) through a pipeline and is used for conveying ultrafine powder obtained after the vertical slag grinder (10) is subjected to ultrafine grinding to the dust remover (15) under the action of air separation, and the finished product bin (16) is arranged at the lower part of the dust remover (15) and is used for conveying products after dust removal to the finished product bin (16).
The device for preparing the steel slag multistage crushing and grinding ultrafine powder further comprises a control system (17) which is connected with the rod grinding slag breaking machine (2), the No. 1 belt line (3), the electromagnetic roller iron removing machine (4), the double-roller slag breaking machine (6), the disc type magnetic separator (7), the No. 2 belt line (9), the vertical slag grinding machine (10), the powerful magnetic separator (11), the bucket elevator (13), the hot blast stove (14) and/or the dust remover (15) through signal cables.
The steel slag breaking machine comprises a steel slag bin (1), a rod grinding slag breaking machine (2) and a grab bucket, wherein the grab bucket is used for placing steel slag tailings in the steel slag bin (1).
The rod grinding slag breaking machine (2) adopts a steel rod as a grinding material for breaking to carry out primary breaking treatment on the steel slag tailings, and the diameter of the steel rod is 30-100 mm; slag hole after rod mill breaker (2) breakage sets up the sieve, and the fineness of slagging tap is adjusted to the sieve of removable different apertures, and sieve mesh control range is 3 ~ 10 mm.
The steel slag tailings crushed by the rod mill slag crusher (2) are subjected to primary magnetic separation by the electromagnetic roller iron remover (4), the magnetic field intensity of the electromagnetic roller iron remover (4) is 1000-3000 gausses, and the cylinder body of the electromagnetic roller iron remover (4) is wrapped by the ceramic rubber composite wear-resistant material.
The pair-roller slag breaking machine (6) is used for carrying out secondary crushing treatment on nonmagnetic steel slag tailings after magnetic separation of the electromagnetic roller iron remover (4), two crushing rollers are arranged in the pair-roller slag breaking machine (6), one of the two crushing rollers is a fixed crushing roller, the other one of the two crushing rollers is a movable crushing roller, and the roller surface of each crushing roller is made of wear-resistant steel.
The disc type magnetic separator (7) performs secondary magnetic separation on the steel slag tailings subjected to secondary crushing treatment by the roller crusher (6), a double-disc or three-disc magnetic separator is adopted, and the magnetic field intensity of the disc type magnetic separator (7) is 1500-5000 gauss.
The vertical slag mill (10) grinds nonmagnetic steel slag tailings magnetically separated by the disc magnetic separator (7), and the roller surface and the millstone of the grinding roller of the vertical slag mill (10) are made of wear-resistant steel.
The high-power magnetic separator (11) magnetically separates the circulating materials discharged in the grinding process of the vertical slag grinding machine (10), the high-power magnetic separator (11) is a permanent magnet roller magnetic separator, the magnetic field intensity is 3000-10000 gauss, and the cylinder body is wrapped with the ceramic rubber composite wear-resistant material.
Wherein, the hot blast stove (14) adopts gas or fuel oil as fuel; the dust remover(15) The dust content of discharged flue gas is lower than 10mg/m3。
Wherein the finished product bin (16) is a columnar silo which is made of concrete or steel structure.
The utility model also provides a method for preparing steel slag multistage crushing and grinding ultrafine powder, preferably adopts the device of one of the above claims 1-11 to prepare steel slag multistage crushing and grinding ultrafine powder, and comprises the following steps:
(1) preferably, a grab bucket is adopted, the steel slag tailings in the steel slag tailing bin (1) are uniformly fed into a rod grinding slag breaking machine (2), and the rod grinding slag breaking machine (2) rotates to drive an internal steel rod grinding material to carry out primary crushing on the steel slag tailings;
(2) the steel slag tailings crushed by the rod-grinding slag crusher (2) are conveyed to an electromagnetic roller iron remover (4) through a No. 1 belt line (3) for magnetic separation treatment, magnetic separation powder obtained by the magnetic separation falls into a magnetic separation powder 1 bin (5), and nonmagnetic steel slag tailings fall into a double-roller slag crusher (6) for secondary crushing treatment;
(3) the steel slag tailings obtained by secondary crushing of the roller slag crusher (6) fall into a disc type magnetic separator (7) for secondary magnetic separation, magnetic separation powder obtained by magnetic separation falls into a magnetic separation powder 2 bin (8), and non-magnetic steel slag tailings are conveyed to a vertical slag grinding machine (10) through a No. 2 belt line (9);
(4) the hot blast stove (14) provides hot air to dry the steel slag tailings entering the vertical slag grinding machine (10); carrying out ultrafine grinding on nonmagnetic steel slag tailings by using a vertical slag grinding machine (10), carrying out strong magnetic separation on a circulating material in the grinding process by using a strong magnetic separator (11), and discharging obtained magnetic separation powder to fall into a magnetic separation powder 3 bin (12); the circulating material is further conveyed to a vertical slag mill (10) through a bucket elevator (13) for circulating grinding until the fineness is qualified, and the ultrafine powder is collected into a bag-type dust remover (15) under the action of air separation and then conveyed to a finished product bin (16). Preferably, (5) the control system (17) controls the rod mill slag breaking machine (2), the belt line (3) No. 1, the electromagnetic roller iron removing machine (4), the double-roller slag breaking machine (6), the disc type magnetic separator (7), the belt line (9) No. 2, the vertical slag milling machine (10), the powerful magnetic separator (11), the bucket elevator (13), the hot blast stove (14), the bag-type dust remover (15) and other production equipment to be started and parameter adjustment through remote operation.
Wherein the grain size of the steel slag tailings entering the rod mill crusher (2) is more than 60% within 20mm, and the grain size of the steel slag tailings crushed by the rod mill slag crusher (2) is more than 90% within 5 mm.
Wherein the current of the electromagnetic roller deironing machine (4) is 0.5-2A, the rotating speed of the roller is 10-60 r/min, the thickness of the steel slag tailing layer is 0-150 mm (0 is not included in principle), and the content of metallic iron in the steel slag tailing after the magnetic separation of the electromagnetic roller deironing machine (4) is lower than 1%.
The double-roller slag crusher (6) controls the gap between the two crushing rollers to control the granularity of the crushed steel slag by adjusting the position of the movable crushing roller, the gap between the two crushing rollers is 10-35 mm, and the granularity of the steel slag tailings after the crushing of the double-roller slag crusher (6) is more than 90% within 2 mm.
Wherein the current of the disc type magnetic separator (7) is 1-3A, the rotating speed of the disc is 10-50 r/min, the thickness of the steel slag tailings layer is 0-100 mm (0 is not included in principle), and the content of metallic iron in the steel slag tailings after magnetic separation by the disc type magnetic separator (7) is lower than 0.7%.
Wherein the rotating speed of a roller of the strong magnetic separator (11) is 10-100 r/min, and the thickness of an outer discharge circulating material layer is 0-150 mm (0 is not included in principle).
Wherein, the hot-blast stove (14) can provide hot-blast air temperature above 400 ℃, and the moisture content of the dried steel slag tailings is within 3%; the content of the discharged flue gas and dust of the bag-type dust remover (15) is lower than 10mg/m3。
Wherein the specific surface area of the steel slag ultrafine powder in the finished product bin (16) exceeds 420m2And/kg, the grinding energy consumption of each ton of steel slag powder is lower than 50kWh, the activity index of the steel slag powder exceeds 80 percent, and the content of metal iron is less than 0.3 percent. The TFe content of the magnetic separation powder collected in the 1 bin (5), the 2 bin (8) and the 3 bin (12) of the magnetic separation powder is more than 40 percent
Preferably, the technical scheme of the utility model as follows: a steel slag multistage crushing and grinding ultrafine powder preparation device comprises: the device comprises a steel slag tailing bin, a rod mill slag breaking machine, a belt line No. 1, an electromagnetic roller iron remover, a magnetic separation powder 1 bin, a double-roller slag breaking machine, a disc type magnetic separator, a magnetic separation powder 2 bin, a belt line No. 2, a vertical slag mill, a powerful magnetic separator, a magnetic separation powder 2 bin, a bucket elevator, a hot blast stove, a bag-type dust remover, a finished product bin and a control system. Stacking steel slag tailings in a steel slag tailing bin, and putting the steel slag tailings into a rod mill slag breaker by adopting a grab bucket; the starting end of the No. 1 belt line is arranged below the rod mill slag breaking machine, and the terminal is arranged above the electromagnetic roller iron remover; the magnetic separation powder 1 bin is arranged below the electromagnetic roller iron remover; the double-roller slag breaking machine is arranged below the electromagnetic roller iron remover; the disc type magnetic separator is arranged below the double-roller slag breaking machine; the magnetic separation powder 2 bin is arranged below the double-roller slag breaking machine; the starting end of the No. 2 belt line is arranged below the double-roller slag breaking machine, and the terminal is arranged above the vertical slag grinding machine; the strong magnetic separator is arranged below the vertical slag grinding machine; a magnetic separation powder 3 bin is arranged below the powerful magnetic separator; the bucket elevator is arranged beside the vertical slag grinding machine; the hot blast stove is connected with the vertical slag grinding machine through a pipeline; the bag-type dust collector is connected with the vertical slag grinding machine and the finished product bin through a pipeline. The control system is connected with a rod mill slag breaker, a belt line No. 1, an electromagnetic roller iron remover, a double-roller slag breaker, a disc type magnetic separator, a belt line No. 2, a vertical slag mill, a powerful magnetic separator, a bucket elevator, a hot blast stove and a bag-type dust remover through signal cables.
Preferably, the utility model also relates to a method for preparing the steel slag multistage grinding ultrafine powder, which comprises the following steps:
(1) uniformly feeding the steel slag tailings in the steel slag tailing bin into a rod grinding slag breaker by using a grab bucket, and rotating the rod grinding slag breaker to drive an internal steel rod grinding material to carry out primary crushing on the steel slag tailings;
(2) conveying the steel slag tailings crushed by the rod mill slag crusher to an electromagnetic roller iron remover through a No. 1 belt line for magnetic separation treatment, wherein magnetic separation powder obtained by magnetic separation falls into a magnetic separation powder 1 bin, and nonmagnetic steel slag tailings fall into a double-roller slag crusher for secondary crushing treatment;
(3) carrying out secondary crushing treatment on the roller slag crusher to obtain steel slag tailings, allowing the steel slag tailings to fall into a disc type magnetic separator for secondary magnetic separation treatment, allowing magnetic separation powder obtained by magnetic separation to fall into a magnetic separation powder 2 bin, and conveying nonmagnetic steel slag tailings to the vertical slag grinding machine through a No. 2 belt line;
(4) the hot blast stove provides hot air to dry the steel slag tailings entering the vertical slag grinding machine. And (3) carrying out ultrafine grinding on the nonmagnetic steel slag tailings by using a vertical slag grinding machine, carrying out strong magnetic separation on the circulating materials in the grinding process by using a strong magnetic separator, and discharging the obtained magnetic separation powder to fall into a magnetic separation powder bin 3. The circulating material is further conveyed to a vertical slag mill through a bucket elevator to be circularly ground until the fineness is qualified, and the ultrafine powder is collected into a bag-type dust collector under the action of winnowing and then conveyed to a finished product bin. The main fan which is generally arranged behind the bag-type dust remover is used for winnowing, and the bag-type dust remover also realizes the function of collecting steel slag powder and collects the steel slag powder into the dust-removing bag.
(5) The control system controls the rod mill slag breaking machine, the belt line No. 1, the electromagnetic roller iron remover, the double-roller slag breaking machine, the disc type magnetic separator, the belt line No. 2, the vertical slag milling machine, the powerful magnetic separator, the bucket elevator, the hot blast stove, the bag-type dust remover and other production equipment to be opened and parameters to be adjusted through remote operation.
The utility model has the advantages that the device and the method realize that the slag low energy consumption prepares the superfine powder material of high activity, and process is simple, and it is high to equip degree of automation, and system processing cycle is short, and economic cost is reasonable, and the product metallic iron content after the processing is low, and the activity index is high. The steel slag treated by the process is used as an admixture for cement and concrete in a large batch and high mixing ratio, can completely meet the requirements of related steel slag resource utilization technical indexes, and can remarkably promote zero discharge of the steel slag.
Drawings
FIG. 1 is a schematic view of a device for preparing steel slag multi-stage grinding ultrafine powder.
Detailed Description
A steel slag multistage crushing and grinding ultrafine powder preparation device is shown as attached figure 1, and comprises: the device comprises a steel slag tailing bin 1, a rod mill slag breaking machine 2, a No. 1 belt line 3, an electromagnetic roller iron remover 4, a magnetic separation powder 1 bin 5, a double-roller slag breaking machine 6, a disc type magnetic separator 7, a magnetic separation powder 2 bin 8, a No. 2 belt line 9, a vertical slag grinding machine 10, a strong magnetic separator 11, a magnetic separation powder 3 bin 12, a bucket elevator 13, a hot blast furnace 14 and a dust remover 15, preferably a cloth bag dust remover 15 and a finished product bin 16, wherein steel slag tailings are stacked in the steel slag tailing bin 1, and the steel slag tailings in the steel slag tailing bin 1 can be sent to the rod mill slag breaking machine 2 for primary crushing treatment; the starting end of the belt line No. 13 is positioned below the rod mill slag breaker 2, and the terminal of the belt line No. 13 is positioned above the electromagnetic roller iron remover 4 and is used for conveying the steel slag tailings crushed by the rod mill slag breaker 2 to the electromagnetic roller iron remover 4 for magnetic separation treatment; the magnetic separation powder 1 bin 5 is arranged below the electromagnetic roller iron remover 4 and used for enabling magnetic separation powder obtained by magnetic separation of the electromagnetic roller iron remover 4 to fall into the magnetic separation powder 1 bin 5; the double-roller slag breaker 6 is arranged below the electromagnetic roller iron remover 4 and is used for enabling nonmagnetic steel slag tailings obtained after the magnetic separation of the electromagnetic roller iron remover 4 to fall into the double-roller slag breaker 6 for secondary breaking treatment; the disc type magnetic separator 7 is arranged below the double-roller slag crusher 6 and is used for enabling the steel slag tailings obtained by secondary crushing treatment of the double-roller slag crusher 6 to fall into the disc type magnetic separator 7 for secondary magnetic separation treatment; the magnetic separation powder 2 bin 8 is arranged below the disc type magnetic separator 7 and used for enabling magnetic separation powder obtained through magnetic separation of the disc type magnetic separator 7 to fall into the magnetic separation powder 2 bin 8; the starting end of the No. 2 belt line 9 is arranged below the disc type magnetic separator 7, and the terminal end of the No. 2 belt line 9 is arranged above the vertical slag grinding machine 10 and is used for conveying nonmagnetic steel slag tailings obtained through magnetic separation of the disc type magnetic separator 7 to the vertical slag grinding machine 10 for superfine grinding; the strong magnetic separator 11 is arranged below the vertical slag mill 10, the magnetic separation powder 3 bin 12 is arranged below the strong magnetic separator 11, and the strong magnetic separator is used for discharging magnetic separation powder obtained by performing strong magnetic separation on circulating materials generated in the grinding process through the strong magnetic separator 11 and enabling the magnetic separation powder to fall into the magnetic separation powder 3 bin 12; the bucket elevator 13 is arranged beside the vertical slag mill 10 and is connected with the discharge end of the magnetically separated circulating material of the strong magnetic separator 11 and the feed end of the vertical slag mill 10, and is used for transporting the magnetically separated circulating material to the vertical slag mill 10 through the bucket elevator 13 for circulating grinding until the fineness is qualified; the hot blast stove 14 is connected with the vertical slag grinding machine 10 through a pipeline and is used for providing hot air for drying the steel slag tailings and/or the circulating materials entering the vertical slag grinding machine 10; the dust remover 15 is connected with the vertical slag grinder 10 through a pipeline and used for conveying ultrafine powder obtained after the vertical slag grinder 10 is subjected to ultrafine grinding to the dust remover 15 under the action of air separation, and the finished product bin 16 is arranged at the lower part of the dust remover 15 and used for conveying products after dust removal to the finished product bin 16. The control system 17 is connected with the rod slag breaking machine 2, the belt line No. 13, the electromagnetic roller iron remover 4, the double-roller slag breaking machine 6, the disc type magnetic separator 7, the belt line No. 2 9, the vertical slag grinding machine 10, the powerful magnetic separator 11, the bucket elevator 13, the hot blast stove 14 and the bag-type dust remover 15 through signal cables.
Wherein the rod mill slag breaker 2 carries out primary crushing treatment on the steel slag tailings, a steel rod is used as a grinding material for crushing, and the diameter of the steel rod is 30-100 mm; slag notch sets up the sieve after 2 broken of rod mill breaker, and the fineness of slagging tap is adjusted to the sieve in removable different apertures, and sieve mesh control range is 3 ~ 10 mm. Wherein, the electromagnetic roller deironing machine 4 carries out magnetic separation once to the slag tailings of the slag after the broken of the rod mill slag breaker 2, the magnetic field intensity of the electromagnetic roller deironing machine 4 is 1000-3000 gausses, and the cylinder of the electromagnetic roller deironing machine 4 is wrapped by the ceramic rubber composite wear-resistant material. Wherein, the pair roller slag breaker 6 carries out the secondary crushing processing to the non-magnetism nature slag tailings after the magnetic separation of electromagnetic drum magnetic separator 4, sets up two crushing rolls in the pair roller slag breaker 6, and one is fixed crushing roll, and one is mobilizable crushing roll, and the crushing roll surface adopts wear-resisting steel. Wherein, disk magnetic separator 7 carries out the secondary magnetic separation to the slag tailings after roller crusher 6 secondary crushing processing secondary crushing, adopts double disk or three-disk magnetic separator, and this disk magnetic separator 7 magnetic field intensity is 1500 ~ 5000 gauss. Wherein, the vertical slag mill 10 grinds the nonmagnetic steel slag tailings after the magnetic separation by the disk magnetic separator 7, and the roller surface and the millstone of the vertical slag mill 10 are made of wear-resistant steel. Wherein, the strong magnetic separator 11 carries out magnetic separation to the circulation material that vertical sediment machine 10 grinding process discharged, and strong magnetic separator 11 is permanent magnetism cylinder magnet separator, and magnetic field intensity is 3000 ~ 10000 gauss, and the barrel wraps up ceramic rubber composite wear-resisting material. Wherein, the hot blast stove 14 adopts fuel gas or fuel oil as fuel; the content of the dust in the discharged flue gas of the bag-type dust remover 15 is lower than 10mg/m3. The finished product bin 16 is a columnar silo and can be constructed by adopting concrete or steel structure materials.
A method for preparing steel slag multi-stage crushing and grinding ultrafine powder is characterized by comprising the following steps: (1) uniformly feeding the steel slag tailings in the steel slag tailing bin 1 into a rod grinding slag breaking machine 2 by adopting a grab bucket, and rotating the rod grinding slag breaking machine 2 to drive an internal steel rod grinding material to carry out primary crushing on the steel slag tailings; (2) the steel slag tailings crushed by the rod mill slag crusher 2 are conveyed to an electromagnetic roller iron remover 4 through a No. 1 belt line 3 for magnetic separation treatment, magnetic separation powder obtained by the magnetic separation falls into a magnetic separation powder 1 bin 5, and nonmagnetic steel slag tailings fall into a double-roller slag crusher 6 for secondary crushing treatment; (3) the steel slag tailings obtained by secondary crushing of the roller slag crusher 6 fall into a disc type magnetic separator 7 for secondary magnetic separation, magnetic separation powder obtained by magnetic separation falls into a magnetic separation powder 2 bin 8, and nonmagnetic steel slag tailings are conveyed to a vertical slag grinding machine 10 through a No. 2 belt line 9; (4) the hot blast stove 14 provides hot air to dry the steel slag tailings entering the vertical slag mill 10. The nonmagnetic steel slag tailings are subjected to superfine grinding by using a vertical slag grinding machine 10, the circulating materials in the grinding process are subjected to strong magnetic separation by using a strong magnetic separator 11, and the obtained magnetic separation powder is discharged and falls into a magnetic separation powder 3 bin 12. The circulating material is further conveyed to a vertical slag mill 10 through a bucket elevator 13 for circulating grinding until the fineness is qualified, and the ultrafine powder is collected into a bag-type dust remover 15 under the action of air separation and then conveyed to a finished product bin 16. (5) The control system 17 controls the opening and parameter adjustment of production equipment such as the rod-grinding slag-breaking machine 2, the belt line No. 13, the electromagnetic roller iron remover 4, the double-roller slag-breaking machine 6, the disk magnetic separator 7, the belt line No. 2 9, the vertical slag-grinding machine 10, the powerful magnetic separator 11, the bucket elevator 13, the hot-blast stove 14, the bag-type dust remover 15 and the like through remote operation.
Wherein, the grain size of the steel slag tailings entering the rod mill crusher 2 is more than 60 percent within 20mm, and the grain size of the steel slag tailings after being crushed by the rod mill crusher 2 is more than 90 percent within 5 mm.
The current of the electromagnetic roller deironing machine 4 is 0.5-2A, the rotating speed of the roller is 10-60 rpm, the thickness of a steel slag tailing layer is 0-150 mm, and the content of metallic iron in the steel slag tailing after the magnetic separation of the electromagnetic roller deironing machine 4 is lower than 1%.
The double-roller slag crusher 6 controls the gap between the two crushing rollers to control the granularity of the crushed steel slag by adjusting the position of the movable crushing roller, the gap between the two crushing rollers is 10-35 mm, and the granularity of the steel slag tailings after the double-roller slag crusher 6 is crushed is more than 90% within 2 mm.
Wherein the current of the disc type magnetic separator 7 is 1-3A, the rotating speed of the disc is 10-50 rpm, the thickness of the steel slag tailing layer is 0-100 mm, and the content of metallic iron in the steel slag tailing after magnetic separation by the disc type magnetic separator 7 is lower than 0.7%.
Wherein the rotating speed of a roller of the strong magnetic separator 11 is 10-100 revolutions per minute, and the thickness of an outer discharge circulating material layer is 0-150 mm.
Wherein, the hot-blast stove 14 can provide hot-blast wind temperature above 400 ℃, and the water content of the dried steel slag tailings is within 3%. The content of the dust in the discharged flue gas of the bag-type dust remover 15 is lower than 10mg/m3。
Wherein the specific surface area of the finished product bin 16 steel slag ultrafine powder exceeds 420m2And/kg, the grinding energy consumption of each ton of steel slag powder is lower than 50kWh, the activity index of the steel slag powder exceeds 80 percent, and the content of metal iron is less than 0.3 percent.
Wherein, the TFe content of the magnetic separation powder collected in the 1 bin 5, the 2 bin 8 and the 3 bin 12 of the magnetic separation powder exceeds 40 percent.
Claims (11)
1. The steel slag multistage crushing and grinding ultrafine powder preparation device is characterized by comprising the following components: the device comprises a steel slag tailing bin (1), a rod grinding slag breaking machine (2), a belt line No. 1 (3), an electromagnetic roller iron remover (4), a magnetic separation powder 1 bin (5), a double-roller slag breaking machine (6), a disc type magnetic separator (7), a magnetic separation powder 2 bin (8), a belt line No. 2 (9), a vertical slag grinding machine (10), a strong magnetic separator (11), a magnetic separation powder 3 bin (12), a bucket elevator (13), a hot blast stove (14), a bag-type dust remover (15) and a finished product bin (16), wherein steel slag tailings are stacked in the steel slag tailing bin (1), and can be sent into the rod grinding slag breaking machine (2) to be subjected to primary crushing treatment; the starting end of the belt line No. 1 (3) is positioned below the rod mill slag breaker (2), and the terminal of the belt line No. 1 (3) is positioned above the electromagnetic roller iron remover (4) and is used for conveying the steel slag tailings crushed by the rod mill slag breaker (2) to the electromagnetic roller iron remover (4) for magnetic separation treatment; the magnetic separation powder 1 bin (5) is arranged below the electromagnetic roller iron remover (4) and is used for enabling magnetic separation powder obtained by magnetic separation of the electromagnetic roller iron remover (4) to fall into the magnetic separation powder 1 bin (5); the pair-roller slag breaking machine (6) is arranged below the electromagnetic roller iron remover (4) and is used for enabling nonmagnetic steel slag tailings obtained after the magnetic separation of the electromagnetic roller iron remover (4) to fall into the pair-roller slag breaking machine (6) for secondary crushing treatment; the disc type magnetic separator (7) is arranged below the double-roller slag crusher (6) and is used for enabling the steel slag tailings obtained by secondary crushing treatment of the double-roller slag crusher (6) to fall into the disc type magnetic separator (7) for secondary magnetic separation treatment; the magnetic separation powder 2 bin (8) is arranged below the disc type magnetic separator (7) and is used for enabling magnetic separation powder obtained through magnetic separation of the disc type magnetic separator (7) to fall into the magnetic separation powder 2 bin (8); the starting end of the No. 2 belt line (9) is arranged below the disc type magnetic separator (7), and the terminal end of the No. 2 belt line (9) is arranged above the vertical slag grinding machine (10) and is used for conveying nonmagnetic steel slag tailings obtained through magnetic separation of the disc type magnetic separator (7) to the vertical slag grinding machine (10) for superfine grinding; the strong magnetic separator (11) is arranged below the vertical slag mill (10), and the magnetic separation powder 3 bin (12) is arranged below the strong magnetic separator (11) and used for discharging magnetic separation powder obtained by performing strong magnetic separation on circulating materials generated in the grinding process through the strong magnetic separator (11) and falling into the magnetic separation powder 3 bin (12); the bucket elevator (13) is arranged beside the vertical slag mill (10), is connected with the discharge end of the circulating material subjected to magnetic separation of the strong magnetic separator (11) and the feed end of the vertical slag mill (10), and is used for conveying the circulating material subjected to magnetic separation into the vertical slag mill (10) through the bucket elevator (13) for circulating grinding until the fineness is qualified; the hot blast stove (14) is connected with the vertical slag grinding machine (10) through a pipeline and is used for providing hot air for drying the steel slag tailings and/or the circulating materials entering the vertical slag grinding machine (10); the dust remover (15) is connected with the vertical slag grinder (10) through a pipeline and is used for conveying ultrafine powder obtained after the vertical slag grinder (10) is subjected to ultrafine grinding to the dust remover (15) under the action of air separation, and the finished product bin (16) is arranged at the lower part of the dust remover (15) and is used for conveying products after dust removal to the finished product bin (16).
2. The steel slag multistage crushing and grinding ultrafine powder preparation device according to claim 1, characterized by further comprising a control system (17) which is connected with the rod mill slag breaker (2), the belt line No. 1 (3), the electromagnetic drum iron remover (4), the double-roller slag breaker (6), the disk magnetic separator (7), the belt line No. 2 (9), the vertical slag mill (10), the powerful magnetic separator (11), the bucket elevator (13), the hot blast stove (14) and/or the dust remover (15) through signal cables.
3. The device for preparing the steel slag multistage grinding ultrafine powder according to one of the claims 1 to 2, characterized by further comprising a grab bucket, wherein the steel slag tailings in the steel slag tailings bin (1) are placed into the rod grinding slag breaking machine (2) through the grab bucket.
4. The steel slag multistage crushing and superfine powder preparation device according to any one of claims 1 to 2, wherein the rod mill slag breaker (2) is used for carrying out primary crushing treatment on steel slag tailings by using a steel rod as a crushing abrasive, and the diameter of the steel rod is 30-100 mm; the slag hole after the rod mill slag breaker (2) is broken sets up the sieve, and the fineness of slagging tap is adjusted to the sieve of removable different apertures, and sieve mesh control range is 3 ~ 10 mm.
5. The steel slag multistage crushing and grinding ultrafine powder preparation device according to one of claims 1 to 2, characterized in that the electromagnetic roller iron remover (4) performs primary magnetic separation on the steel slag tailings crushed by the rod mill slag crusher (2), the magnetic field strength of the electromagnetic roller iron remover (4) is 1000-3000 gauss, and the cylinder of the electromagnetic roller iron remover (4) is wrapped by the ceramic rubber composite wear-resistant material.
6. The device for preparing the superfine powder by multistage crushing of the steel slag according to the claims 1 to 2, wherein the double-roller slag crusher (6) is used for carrying out secondary crushing treatment on the nonmagnetic steel slag tailings after magnetic separation by the electromagnetic drum iron remover (4), two crushing rollers are arranged in the double-roller slag crusher (6), one of the two crushing rollers is a fixed crushing roller, the other one of the two crushing rollers is a movable crushing roller, and the roller surfaces of the two crushing rollers are made of wear-resistant steel.
7. The steel slag multistage crushing and grinding ultrafine powder preparation device according to one of claims 1 to 2, characterized in that the disc type magnetic separator (7) performs secondary magnetic separation on the steel slag tailings after secondary crushing treatment of the pair roller slag crusher (6), a double-disc or three-disc magnetic separator is adopted, and the magnetic field strength of the disc type magnetic separator (7) is 1500-5000 gauss.
8. The apparatus for preparing ultrafine powder of steel slag according to any of claims 1 to 2, wherein the vertical slag mill (10) grinds the nonmagnetic steel slag tailings magnetically separated by the disk magnetic separator (7), and the roller surfaces and the millstones of the rollers of the vertical slag mill (10) are made of wear-resistant steel.
9. The device for preparing the superfine powder by multistage crushing and grinding of the steel slag according to one of the claims 1 to 2, wherein the high-power magnetic separator (11) performs magnetic separation on the circulating material discharged in the grinding process of the vertical slag grinder (10), the high-power magnetic separator (11) is a permanent magnet roller magnetic separator, the magnetic field intensity is 3000-10000 Gauss, and a cylinder body is wrapped by a ceramic rubber composite wear-resistant material.
10. The device for preparing the steel slag multistage grinding ultrafine powder according to one of the claims 1 to 2, wherein the hot blast stove (14) adopts gas or fuel oil as fuel; the dust content of the discharged flue gas and dust of the dust remover (15) is lower than 10mg/m3。
11. The apparatus for preparing ultrafine powders of steel slag according to any of claims 1 to 2, wherein the final product silo (16) is a cylindrical silo, which is made of concrete or steel.
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