CN114735953A - Recycling method of high-titanium blast furnace slag - Google Patents
Recycling method of high-titanium blast furnace slag Download PDFInfo
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- CN114735953A CN114735953A CN202210375260.1A CN202210375260A CN114735953A CN 114735953 A CN114735953 A CN 114735953A CN 202210375260 A CN202210375260 A CN 202210375260A CN 114735953 A CN114735953 A CN 114735953A
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- 239000002893 slag Substances 0.000 title claims abstract description 238
- 239000010936 titanium Substances 0.000 title claims abstract description 71
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004064 recycling Methods 0.000 title claims abstract description 25
- 238000005266 casting Methods 0.000 claims abstract description 58
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000010248 power generation Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 20
- 239000000498 cooling water Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 230000007306 turnover Effects 0.000 claims description 5
- 241000269793 Cryothenia peninsulae Species 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims 5
- 238000005304 joining Methods 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000003818 cinder Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010583 slow cooling Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910009973 Ti2O3 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
- GQUJEMVIKWQAEH-UHFFFAOYSA-N titanium(III) oxide Chemical compound O=[Ti]O[Ti]=O GQUJEMVIKWQAEH-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Manufacture Of Iron (AREA)
- Furnace Details (AREA)
Abstract
The invention belongs to the technical field of comprehensive utilization of metallurgical solid waste resources, and particularly discloses a recycling method of high-titanium blast furnace slag, aiming at solving the problem of recycling sensible heat resources of the high-titanium blast furnace slag. According to the recycling method of the high titanium type blast furnace slag, liquid high titanium type blast furnace slag with the temperature of 1200-1350 ℃ is cast into high temperature slag blocks with the temperature of 900-1000 ℃ by using slag casting plates, and then the high temperature slag blocks are intermittently added into a heat exchange tank to exchange heat through cold air flowing from bottom to top in the heat exchange tank; after heat exchange, cold air is changed into hot air and used for power generation of power generation equipment or material drying, so that sensible heat resources of the high-titanium blast furnace slag can be fully recycled, and the utilization rate can reach more than 40%.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of metallurgical solid waste resources, and particularly relates to a recycling method of high-titanium type blast furnace slag.
Background
Vanadium-titanium magnetite is used as a main raw material, and vanadium-containing molten iron and high-titanium blast furnace slag are obtained by smelting through a traditional blast furnace smelting process, wherein the main components of the high-titanium blast furnace slag are shown in the following table (w%):
| CaO | SiO2 | MgO | Al2O3 | TTiO2 | Ti2O3 | TiO | TiC | TiN | TFe | MFe | FeO | MnO |
| 25.52 | 24.63 | 7.59 | 13.19 | 22.47 | 1.92 | 2.01 | 0.279 | 0.235 | 3.6 | 2.45 | 1.48 | 1.05 |
。
because the high-titanium blast furnace slag does not have the activity of volcanic ash and can not be used as high-activity slag micropowder after being subjected to water quenching and grinding like common blast furnace slag, the high-titanium blast furnace slag is still crushed into graded aggregate by adopting the traditional hot splashing slow cooling treatment mode and is applied to the field of concrete.
At present, 99% of high titanium type blast furnace slag adopts a traditional hot splashing and slow cooling treatment mode, and 1% of high titanium type blast furnace slag adopts a slag pool water quenching treatment mode. And crushing the large slag blocks obtained after the slow cooling treatment into small blocks by an excavator, and crushing the small blocks into broken stones and slag sand by adopting a multi-stage crushing and iron-selecting process, wherein the broken stones and the slag sand are used as concrete aggregate.
Although the prior treatment mode can realize the full resource utilization of the high titanium blast furnace slag, the following problems still exist:
1) sensible heat resources of the high titanium type blast furnace slag at 1000 ℃ are not recycled, and are wasted through a hot splashing and slow cooling process, so that the resource utilization rate is low;
2) the treatment and utilization efficiency is low, the mode is backward, the occupied area is large, the production rhythm is tight, and no turnover room is left;
3) waste gas, dust, water vapor and the like formed in the treatment process have influence on the environment, and the field environment is poor;
4) the labor intensity of workers is high, the efficiency is low, and the working environment is poor;
5) the treatment cost is high, and the consumption of the excavator is large.
Disclosure of Invention
The invention provides a method for recycling high-titanium blast furnace slag, and aims to solve the problem of recycling sensible heat resources of the high-titanium blast furnace slag.
The technical scheme adopted by the invention for solving the technical problems is as follows: method for recycling high-titanium blast furnace slag, TiO in high-titanium blast furnace slag2Is in mass percent ofIn an amount of 22% to 25%, the method comprising the steps of: casting liquid high-titanium blast furnace slag with the temperature of 1200-1350 ℃ into high-temperature slag blocks with the temperature of 900-1000 ℃ by using a slag casting plate, and intermittently adding the high-temperature slag blocks into a heat exchange tank to exchange heat by cold air flowing from bottom to top in the heat exchange tank; after heat exchange, cold air is changed into hot air and used for power generation of power generation equipment or material drying, and high-temperature slag blocks are changed into cold slag blocks below 200 ℃ and continuously discharged from a discharge port at the bottom of the heat exchange tank to be used for manufacturing graded aggregate.
Furthermore, the casting slag plate comprises a plate main body, a pit is arranged on the casting slag surface of the plate main body, a cooling cavity positioned on the lower side of the pit is arranged in the plate main body, and a cooling water inlet and a cooling water outlet which are respectively communicated with the cooling cavity are arranged on the plate main body.
Furthermore, at least two pits are arranged on the casting slag surface of the plate main body in a rectangular array.
Further, the cross section of the pit is in an inverted trapezoid shape.
Furthermore, the length of the pithead of the pit is 80-100 mm, the width of the pithead of the pit is 80-100 mm, and the depth of the pit is 100-120 mm.
Further, the heat exchange tank comprises a vertical tank body with a top air outlet and a bottom air inlet, a feeding sealing device is arranged at the upper part of the vertical tank body, and a continuous discharging device is arranged at the lower part of the vertical tank body.
Further, the power generation plant includes a waste heat boiler and a generator.
Further, the process of casting the slag blocks comprises the following steps: making the casting slag surface of the casting slag plate pit upward, scattering a layer of high titanium blast furnace slag fine sand with the granularity less than or equal to 0.5mm on the surface of the pit, and simultaneously opening intermediate cooling water of the casting slag plate for pre-cooling; transporting the liquid high titanium blast furnace slag with the temperature of 1200-1350 ℃ to the upper part of the side part of the slag casting plate through a slag pot car, then tipping the slag pot of the slag pot car, and pouring the liquid high titanium blast furnace slag into a pit of the slag casting plate; after pouring, vibrating the slag casting plate by adopting a vibrator to flatten the slag surface of the liquid high titanium blast furnace slag; then, spraying water on the slag surface of the liquid high-titanium blast furnace slag for cooling to obtain high-temperature slag blocks at the temperature of 900-1000 ℃; and finally, starting a plate turning mechanism to turn over the casting slag plate, and vibrating the casting slag plate by adopting a vibrator to demould the high-temperature slag block and drop the high-temperature slag block into a slag block tank through a collecting hopper.
Further, the process of heat exchange of the slag blocks comprises the following steps: transport the downside of lifting machine with high temperature slag block through the slag block jar earlier to transport the top charge door of heat transfer jar with high temperature slag block through the lifting machine, rethread feeding device intermittent type formula adds in the heat transfer jar, blows in cold wind through the bottom air intake of fan to the heat transfer jar simultaneously, and cold wind flows from bottom to top in the heat transfer jar, and the high temperature slag block of adding from top to bottom drops in the heat transfer jar and carries out the heat transfer with cold wind and become the cold slag block below 200 ℃.
Further, cold slag blocks discharged from a discharge port at the bottom of the heat exchange tank are sequentially subjected to crushing, magnetic separation and screening treatment to prepare aggregates with different particle sizes.
The invention has the beneficial effects that:
1) liquid high-titanium blast furnace slag is cast into high-temperature slag blocks, then the high-temperature slag blocks are intermittently added into a heat exchange tank for heat exchange, hot air generated by heat exchange is used for power generation of power generation equipment or material drying, sensible heat resources of the high-titanium blast furnace slag can be fully recycled, and the utilization rate reaches more than 40%.
2) In the whole recycling process, the resource utilization rate of the high titanium blast furnace slag is high, the occupied area is small, and the production rhythm is compact.
3) In the whole recovery treatment process, the labor intensity of workers is low, the efficiency is high, and the operation environment is improved.
4) And by casting the slag blocks, the consumption of an excavator is saved, and the treatment cost is reduced.
Drawings
FIG. 1 is a process flow diagram of the process of the present invention;
FIG. 2 is a schematic top view of a slag plate;
FIG. 3 is a cross-sectional structural schematic view of a slag plate;
FIG. 4 is a schematic structural view of an apparatus for casting a clinker in accordance with the present invention;
FIG. 5 is a schematic view of the heat exchange and power generation apparatus of the present invention;
labeled as: the slag ladle 100, the slag casting plate 200, the pit 210, the cooling cavity 220, the cooling water inlet 230, the cooling water outlet 240, the collecting hopper 300, the slag block tank 400, the elevator 500, the heat exchange tank 600, the fan 700, the waste heat boiler 800 and the generator 900.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to FIG. 1, a method for recycling high titanium blast furnace slag containing TiO is provided2The content of the active carbon is 22-25 percent by mass, and the method comprises the following steps: casting liquid high-titanium blast furnace slag with the temperature of 1200-1350 ℃ into high-temperature slag blocks with the temperature of 900-1000 ℃ by using a slag casting plate 200, and intermittently adding the high-temperature slag blocks into the heat exchange tank 600 to exchange heat by cold air flowing from bottom to top in the heat exchange tank 600; after heat exchange, cold air is changed into hot air and used for power generation of power generation equipment or material drying, and high-temperature slag blocks are changed into cold slag blocks below 200 ℃ and continuously discharged from a discharge port at the bottom of the heat exchange tank 600 and used for manufacturing graded aggregate.
The method for recycling the high-titanium blast furnace slag comprises the steps of pouring liquid high-titanium blast furnace slag on a slag casting plate 200 to cast the slag into high-temperature slag blocks, collecting the high-temperature slag blocks, then intermittently adding the high-temperature slag blocks into a heat exchange tank for heat exchange, recycling sensible heat of the high-temperature slag blocks for power generation or material drying, and crushing cooled cold slag blocks to prepare graded aggregates with different particle sizes; compared with the traditional slag field hot splashing and slow cooling process, the method has the advantages of high treatment efficiency, small occupied area and compact flow; the sensible heat resource of the high titanium blast furnace slag can be effectively recovered, and the utilization rate reaches more than 40%; the high titanium type blast furnace slag with the temperature of 1000 ℃ contains standard coal with sensible heat resources equivalent to 25kg per ton, if the sensible heat resources of 400 ten thousand tons of high titanium type blast furnace slag of a certain steel enterprise per year are recycled, the recycled sensible heat resources can be converted into about 4 ten thousand tons of standard coal according to the 40% recovery rate, and the conversion value is about 6 million yuan; in addition, the graded aggregate prepared from the cold slag blocks can be applied to the field of building materials, and the resource utilization rate can reach 100%.
Wherein the specific heat of the liquid high titanium blast furnace slag is about1.2 kJ/(kg. DEG C.), which is equivalent to 25kg standard coal/t slag (200-1000 ℃), and the bulk density of 1.5t/m3The specific gravity is 3.4 to 3.49t/m3。
The slag casting plate 200 is mainly used for casting liquid high titanium type blast furnace slag into high temperature slag blocks; referring to fig. 2 and 3, the slag casting plate 200 generally includes a plate body, a pit 210 is formed in a slag casting surface of the plate body, a cooling chamber 220 is formed in the plate body and located below the pit 210, and a cooling water inlet 230 and a cooling water outlet 240 are formed in the plate body and respectively communicated with the cooling chamber 220. The cooling cavity 220 is mainly used for rapidly cooling the exterior of the cast high-temperature slag block to rapidly form the slag block, and a liquid core is reserved inside the cooling cavity to reserve most of sensible heat resources; when the slag casting plate 200 is used, water is usually required to be dried at the crater of the pit 210 to be matched with the cooling cavity 220, so that the liquid high titanium blast furnace slag is rapidly cooled and formed.
On the basis of the above, in order to cast a plurality of high temperature slag blocks at the same time, as shown in fig. 2, at least two pits 210 are formed and distributed in a rectangular array on the casting slag surface of the plate body. The pit 210 may have various structures, and in order to facilitate the demolding of the high-temperature clinker, the pit 210 is preferably configured to have an inverted trapezoidal cross section.
In order to fully recycle sensible heat resources and facilitate crushing of slag lumps, liquid high titanium blast furnace slag is generally poured to an appropriate size, and therefore, it is preferable that the length of the crater of the pit 210 is 80 to 100mm, the width of the crater is 80 to 100mm, and the depth of the pit 210 is 100 to 120 mm. The pit 210 with the structural size can ensure that the sensible heat resources can be effectively reserved for the cast high-temperature slag blocks, the heat exchange is facilitated, the cooled slag blocks are crushed, and the cost is reduced.
Referring to fig. 1, 2 and 4, the process of casting the slag block is as follows: making the casting slag surface of the casting slag plate 200 with the pit 210 upward, scattering a layer of high titanium blast furnace slag fine sand with the granularity of less than or equal to 0.5mm on the surface of the pit 210, and simultaneously starting cooling water in the middle of the casting slag plate 200 for precooling; transporting the liquid high titanium blast furnace slag with the temperature of 1200-1350 ℃ to the upper part of the side part of the slag casting plate 200 through the slag ladle 100, then tipping the slag ladle of the slag ladle 100, and pouring the liquid high titanium blast furnace slag into the pit 210 of the slag casting plate 200; after the pouring is finished, vibrating the slag casting plate 200 by using a vibrator to flatten the slag surface of the liquid high titanium blast furnace slag; then, water is sprayed on the slag surface of the liquid high titanium type blast furnace slag for cooling to obtain high temperature slag blocks at 900-1000 ℃, and the high temperature slag blocks can be formed usually within about one hour and have certain strength; finally, the plate turnover mechanism is started to tip over the cast slag plate 200, and the vibrator is adopted to vibrate the cast slag plate 200, so that the high-temperature slag blocks are demoulded and fall into the slag block tank 400 through the collecting hopper 300. By scattering a layer of high titanium type blast furnace slag fine sand with the granularity less than or equal to 0.5mm, on one hand, the poured liquid high titanium type blast furnace slag can be prevented from sticking a mold, and on the other hand, the high temperature slag block can be favorably and quickly formed; through using vibrator vibration to cast slag plate 200, do benefit to liquid slag face and shakeout fast and the quick drawing of patterns of high temperature cinder, provide production efficiency, through the cooling of casting slag plate 200 self and the forced cooling of watering on the slag face, can improve the cooling shaping speed of high temperature cinder, further improved production efficiency.
The slag casting plate 200 is generally rotatably arranged beside a slag ladle railway and supported by a bearing steel frame, and is provided with a part for limiting the rotation of the slag casting plate; the collecting hopper 300 is generally arranged right below the slag casting plate 200 and is mainly used for collecting high-temperature slag blocks in a centralized manner; the clinker tank 400 is primarily used to store and transport high temperature clinker to the elevator 500, which is generally directly below the collection hopper 300.
With reference to fig. 4 and 5, the heat exchange process of the slag block is as follows: transport the downside of lifting machine 500 through cinder block jar 400 earlier with high temperature cinder block to transport the top charge door of heat transfer jar 600 with high temperature cinder block through lifting machine 500, in rethread feeding device intermittent type formula adds heat transfer jar 600, blow in cold wind to the bottom air intake of heat transfer jar 600 through fan 700 simultaneously, cold wind flows from bottom to top in heat transfer jar 600, the high temperature cinder block of adding drops from top to bottom in heat transfer jar 600 and carries out the heat transfer with cold wind and become the cold cinder block below 200 ℃. Through up down intermittent type formula add high temperature slag block to blow cold wind from bottom to top in heat transfer jar 600, do benefit to high temperature slag block and cold wind heat transfer on the one hand, effectively retrieve sensible heat resource, on the other hand can compromise quick, the arranging in succession of slag block, has guaranteed production efficiency.
The hoist 500 is primarily used to lift the high temperature slag block to a high location, and generally includes a bracket and a crown block. The heat exchange tank 600 is mainly used for heat exchange between the high-temperature slag block and a medium; the heat exchange tank 600 can be various, and preferably, as shown in fig. 5, the heat exchange tank 600 comprises a vertical tank body with a top air outlet and a bottom air inlet, wherein the upper part of the vertical tank body is provided with a feeding sealing device, and the lower part of the vertical tank body is provided with a continuous discharging device. The fan 700 is mainly used to provide power for medium circulation, i.e., cool air is blown into the heat exchange tank 600. The power generation equipment mainly uses hot air for secondary heat exchange to generate power, and generally comprises a waste heat boiler 800 and a generator 900.
Preferably, the method for recycling high titanium blast furnace slag further comprises the following steps: the cold slag blocks discharged from the discharge port at the bottom of the heat exchange tank 600 are sequentially crushed, magnetically separated and screened to prepare aggregates with different particle sizes. The cold slag blocks are generally crushed in multiple stages. The length of the slag block is more than 80mm, aggregates with different grain sizes are formed by crushing, and the critical aggregate with the size of 40mm can be produced to the maximum extent, so that the construction requirement of commercial concrete is met.
Example 1
The process of recycling the high titanium blast furnace slag at a time comprises the following steps:
making the casting slag surface of the casting slag plate 200 with the pit 210 upward, scattering a layer of high titanium blast furnace slag fine sand with the granularity of less than or equal to 0.5mm on the surface of the pit 210, and simultaneously starting cooling water in the middle of the casting slag plate 200 for precooling; transporting the liquid high titanium blast furnace slag with the temperature of 1200-1350 ℃ to the upper part of the side part of the slag casting plate 200 through the slag tanker 100, then tipping the slag ladle of the slag tanker 100, and pouring the liquid high titanium blast furnace slag into the pit 210 of the slag casting plate 200; after the pouring is finished, slightly vibrating the slag casting plate 200 by using a vibrator to flatten the slag surface of the liquid high titanium blast furnace slag; then, spraying water on the slag surface of the liquid high-titanium blast furnace slag for cooling, and cooling the slag into high-temperature slag blocks at 900-1000 ℃ after 1 hour; starting a plate turning mechanism to turn over the slag casting plate 200, and slightly vibrating the slag casting plate 200 by using a vibrator to demould high-temperature slag blocks and drop the high-temperature slag blocks into the slag block tank 400 through the collecting hopper 300;
then, the high-temperature slag blocks are conveyed to the lower side of a lifting machine 500 through a slag block tank 400, the high-temperature slag blocks are conveyed to a top feeding port of a heat exchange tank 600 through the lifting machine 500, the high-temperature slag blocks are intermittently added into the heat exchange tank 600 through a feeding device, cold air is blown into a bottom air inlet of the heat exchange tank 600 through a fan 700, the cold air flows from bottom to top in the heat exchange tank 600, the added high-temperature slag blocks drop from top to bottom in the heat exchange tank 600 to exchange heat with the cold air to form cold slag blocks with the temperature of below 200 ℃, the cold slag blocks are continuously discharged from a bottom discharge port of the heat exchange tank 600, and then are subjected to multi-stage crushing, magnetic separation and screening sequentially to prepare aggregates with different grain grades, the aggregates are used as the aggregates, and iron-containing objects recovered in the process are returned to an iron making process for use; after heat exchange, cold air is changed into hot air and used for power generation of power generation equipment, and the hot air can also be used for material drying or other purposes.
Claims (10)
1. Method for recycling high-titanium blast furnace slag, TiO in high-titanium blast furnace slag2The content of the active carbon is 22-25 percent by mass, and the method is characterized by comprising the following steps: casting liquid high-titanium blast furnace slag with the temperature of 1200-1350 ℃ into high-temperature slag blocks with the temperature of 900-1000 ℃ by using a slag casting plate (200), and intermittently adding the high-temperature slag blocks into a heat exchange tank (600) to exchange heat by cold air flowing from bottom to top in the heat exchange tank (600); after heat exchange, cold air is changed into hot air and used for power generation of power generation equipment or material drying, and high-temperature slag blocks are changed into cold slag blocks below 200 ℃ and continuously discharged from a discharge port at the bottom of the heat exchange tank (600) and used for manufacturing graded aggregate.
2. The method for recycling high titanium blast furnace slag according to claim 1, wherein: the slag casting plate (200) comprises a plate main body, a pit (210) is arranged on the slag casting surface of the plate main body, a cooling cavity (220) positioned on the lower side of the pit (210) is arranged in the plate main body, and a cooling water inlet (230) and a cooling water outlet (240) which are respectively communicated with the cooling cavity (220) are arranged on the plate main body.
3. The method of recycling high titanium blast furnace slag according to claim 2, wherein: the number of the pits (210) is at least two, and the pits are distributed on the casting slag surface of the plate main body in a rectangular array.
4. The method for recycling high titanium type blast furnace slag according to claim 3, wherein: the cross section of the pit (210) is in an inverted trapezoid shape.
5. The method of recycling high titanium blast furnace slag according to claim 4, wherein: the length of the pithead of the pit (210) is 80-100 mm, the width of the pithead is 80-100 mm, and the depth of the pit (210) is 100-120 mm.
6. The method for recycling high titanium type blast furnace slag according to claim 1, wherein: the heat exchange tank (600) comprises a vertical tank body with a top air outlet and a bottom air inlet, wherein the upper part of the vertical tank body is provided with a feeding sealing device, and the lower part of the vertical tank body is provided with a continuous discharging device.
7. The method for recycling high titanium blast furnace slag according to claim 1, wherein: the power generation plant comprises a waste heat boiler (800) and a generator (900).
8. The method for recycling high titanium blast furnace slag according to any one of claims 1 to 7, wherein the process of casting the slag lumps comprises: enabling the casting slag surface of the casting slag plate (200) with the pit (210) to be upward, scattering a layer of high titanium blast furnace slag fine sand with the granularity of less than or equal to 0.5mm on the surface of the pit (210), and simultaneously starting intermediate cooling water of the casting slag plate (200) for precooling; transporting liquid high titanium blast furnace slag with the temperature of 1200-1350 ℃ to the upper part of the side part of the slag casting plate (200) through a slag tank car (100), then tipping a slag tank of the slag tank car (100), and pouring the liquid high titanium blast furnace slag into a pit (210) of the slag casting plate (200); after the pouring is finished, vibrating the slag casting plate (200) by adopting a vibrator to flatten the slag surface of the liquid high titanium blast furnace slag; then, spraying water on the slag surface of the liquid high-titanium blast furnace slag for cooling to obtain high-temperature slag blocks at the temperature of 900-1000 ℃; and finally, starting a plate turning mechanism to turn over the cast slag plate (200), and vibrating the cast slag plate (200) by adopting a vibrator to demould the high-temperature slag block and drop the high-temperature slag block into the slag block tank (400) through the collecting hopper (300).
9. The method for recycling the high titanium type blast furnace slag according to claim 8, wherein the heat exchange process of the slag blocks is as follows: transport the downside of lifting machine (500) through sediment piece jar (400) earlier with high temperature sediment piece to transport the top charge door of heat transfer jar (600) through lifting machine (500) with high temperature sediment piece, in rethread feeding device intermittent type formula adds heat transfer jar (600), blow in cold wind to the bottom air intake of heat transfer jar (600) through fan (700) simultaneously, cold wind is by down up flow in heat transfer jar (600), the high temperature sediment piece of joining drops from top to bottom in heat transfer jar (600) and carries out the heat transfer with cold wind and become the cold sediment piece below 200 ℃.
10. The method of recycling high titanium blast furnace slag according to claim 8, wherein: the cold slag blocks discharged from a discharge port at the bottom of the heat exchange tank (600) are sequentially crushed, magnetically separated and screened to prepare aggregates with different particle sizes.
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| CN101195525A (en) * | 2007-11-21 | 2008-06-11 | 攀枝花环业冶金渣开发有限责任公司 | High-titanium dry slag sand manufacturing method |
| CN105132604A (en) * | 2015-08-17 | 2015-12-09 | 北京中冶设备研究设计总院有限公司 | Slag casting heat removing device and method |
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| CN207418779U (en) * | 2017-11-23 | 2018-05-29 | 登封市少林刚玉有限公司 | A kind of pre-melted slag casting device |
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| CN101195525A (en) * | 2007-11-21 | 2008-06-11 | 攀枝花环业冶金渣开发有限责任公司 | High-titanium dry slag sand manufacturing method |
| CN105132604A (en) * | 2015-08-17 | 2015-12-09 | 北京中冶设备研究设计总院有限公司 | Slag casting heat removing device and method |
| CN106587676A (en) * | 2016-12-12 | 2017-04-26 | 攀枝花环业冶金渣开发有限责任公司 | Method for preparing cement clinker ingredients from high Ti-bearing blast furnace slag |
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