CN108796149B - Slag granulating device with graded granularity - Google Patents

Slag granulating device with graded granularity Download PDF

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Publication number
CN108796149B
CN108796149B CN201811034580.0A CN201811034580A CN108796149B CN 108796149 B CN108796149 B CN 108796149B CN 201811034580 A CN201811034580 A CN 201811034580A CN 108796149 B CN108796149 B CN 108796149B
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slag
rotary
spray head
granulation
unit
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CN108796149A (en
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王海军
音正元
常立忠
吴巍
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YANGZHOU XIONGLIAN METALLURGY TECHNOLOGY Co.,Ltd.
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Anhui University of Technology AHUT
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Furnace Details (AREA)

Abstract

The invention discloses a slag granulating device with graded granularity, and belongs to the technical field of blast furnace slag utilization. The slag granulation device comprises a slag loading unit, a granulation unit, a screening unit and a shell, wherein the granulation unit is arranged in the shell and comprises a rotary slag disc and a cooling mechanism, a heating part is arranged on the rotary slag disc, and a slag particle spray head, a liquefaction spray head and an atomization spray head of the cooling mechanism are arranged at the circumferential edge of the rotary slag disc; the slag loading unit comprises a slag pot and a slag discharging channel, the slag discharging channel is arranged at the bottom of the slag pot, and an outlet of the slag discharging channel is positioned above the rotary slag disc. A slag film is formed at the edge of the rotary slag disk, and the heating part heats and preserves the blast furnace slag at the edge of the rotary slag disk, so that the slag film is maintained at a higher temperature, the formation of the slag film is inhibited, and the reduction of the granularity of granulated slag is facilitated; the screening unit is located the discharge gate department of casing below, and the screening unit is to the graining sediment screening processing, obtains the graining sediment of particle size classification, realizes the utilization of blast furnace slag as a resource.

Description

Slag granulating device with graded granularity
Technical Field
The invention relates to the technical field of blast furnace slag utilization in the metallurgical industry, in particular to a slag granulating device with graded granularity.
Background
Blast furnace slag is a byproduct generated in blast furnace iron making, after various raw fuels entering a furnace are smelted, in addition to the byproducts such as molten iron (steel-making pig iron or cast pig iron) and blast furnace gas, gangue in iron ore and ash and flux in the fuel are easy to form liquid slag in a high-temperature environment, the temperature of the liquid slag is 1350-1450 ℃ generally, and the liquid slag is discharged through a slag hole and an iron hole. At present, blast furnace slag is one of the most main wastes in the steel industry, 300-600 kg of blast furnace slag is generated when one ton of pig iron is produced, statistics shows that the yield of pig iron in China in 2017 is about 7.1 hundred million tons, the yield of blast furnace slag is about 2.1-4.3 hundred million tons, and the problem of efficient utilization of blast furnace slag resources is urgently solved. At present, the treatment method of blast furnace slag at home and abroad mainly adopts a water quenching method, and the obtained amorphous slag product can be used as a cement clinker substitute with high energy consumption, so that higher additional value and environmental benefit are obtained, but the treatment of the blast furnace slag by adopting the water quenching method and a centrifugal method generally has some problems, such as large granularity and low granulation efficiency of granulated slag, influences the granulation efficiency and resource recovery efficiency of the blast furnace slag, and simultaneously a large amount of waste heat of the blast furnace slag cannot be reasonably utilized.
Through retrieval, the name of the invention is: the liquid blast furnace slag granulation and multi-roller waste heat recovery system (application number: 201310656436.1, application date: 2013-12-6) comprises a primary vaporization roller granulation bin, a secondary vaporization roller storage bin, a tertiary roller cooler and a waste heat recovery system, wherein a feed inlet of the primary vaporization roller granulation bin is provided with a liquid slag launder and a granulator, and the primary vaporization roller granulation bin, the secondary vaporization roller storage bin and the tertiary roller cooler are connected in series; the primary vaporization roller granulation bin, the secondary vaporization roller storage bin and the tertiary roller cooler are all provided with steam water inlets and outlets; the waste heat recovery system comprises a water feeding pump, a deaerator and a steam drum which are communicated through a water conveying pipeline. The waste heat of the blast furnace slag can be utilized in a cascade mode to produce high-grade saturated steam, the utilization grade of the waste slag is improved through rapid cooling of the solid slag, and the continuous operation of the whole process is not affected by the intermittent period of the blast furnace. The disadvantages are that: in addition, the blast furnace slag with larger granularity is not beneficial to using the granulated slag as raw materials such as cement and the like, and has poorer performance.
Through retrieval, the name of the invention is: the application discloses a system for generating water vapor by using blast furnace slag, which comprises a buffer tank, a granulation tower and a heat exchange mechanism, wherein the buffer tank is connected with the granulation tower through a pipeline; the inlet of the buffer tank is used for receiving the slag discharged by the blast furnace, and the outlet end of the buffer tank is communicated with the slag inlet of the granulation tower; the granulation tower is provided with a granulation water inlet, a water vapor outlet and a slag outlet, the granulation water sprayed from the granulation water inlet carries out water quenching on the slag discharged from the slag inlet and generates water vapor, and the water vapor outlet is communicated with the heat exchange mechanism through a steam pipeline. The method for generating the water vapor by the blast furnace slag is implemented based on the system. The water vapor is used as a heat transfer carrier, so that the scaling and corrosion of impurities in the blast furnace slag flushing water to a heat exchanger and a pipeline are avoided; the buffer tank can solve the problem of unstable steam generation caused by discontinuous slag tapping of the blast furnace, so that slag flushing in the granulation tower is continuous, steam can be continuously generated in the granulation tower, and waste heat utilization of blast furnace slag is facilitated. But the disadvantages are that the slag directly enters the granulation tower through the buffer tank and then is cooled by water to become solid slag, and because the slag is directly cooled in the granulation tower, the granulated slag has larger granularity, poorer heat exchange effect and lower energy utilization rate, the larger granularity of the granulated slag is not beneficial to the use of the granulated slag for raw materials such as cement, and the performance is lower.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems of large granularity and low granulation efficiency of granulated slag produced by a centrifugal method of high-temperature slag in the prior art, and provides a granularity grading slag granulating device, which maintains a slag film in a liquid state by a heating part, prevents chilling to reduce the fluidity of the slag film, inhibits the generation of the slag film and reduces the granularity of the granulated slag.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a graded-granularity slag granulating device, which comprises a slag charging unit, a granulating unit, a screening unit and a shell, wherein the granulating unit is arranged in the shell and comprises a rotary slag disk and a cooling mechanism, a heating part is arranged on the rotary slag disk, and a slag particle spray head, a liquefying spray head and an atomizing spray head of the cooling mechanism are arranged at the circumferential edge of the rotary slag disk; the slag loading unit comprises a slag pot and a slag discharging channel, the slag discharging channel is arranged at the bottom of the slag pot, and an outlet of the slag discharging channel is positioned above the rotary slag disc; the screening unit is located the discharge gate department of casing below, and this screening unit has set gradually upper screen and lower floor's sieve from top to bottom.
Preferably, the heating member is disposed in the edge region of the rotating slag disk.
Preferably, the mesh aperture of the upper layer screen is 5mm, and the mesh aperture of the lower layer screen is 1 mm; the upper-layer sieve and the lower-layer sieve are obliquely arranged, an included angle between the upper-layer sieve and the vertical direction is m, the value of m is 40-50 degrees, an included angle between the lower-layer sieve and the vertical direction is n, and n and m are complementary.
Preferably, the bottom end of the upper screen is located on the same side as the top end of the lower screen.
Preferably, the screening unit is provided with an upper outlet, a middle outlet and a lower outlet, wherein the upper outlet is arranged corresponding to the bottom end of the upper-layer screen, and the middle outlet is arranged corresponding to the bottom end of the lower-layer screen; the lower outlet is located at the bottom of the sieving unit.
Preferably, the lower part of the shell is provided with a contraction section, and the discharge hole of the shell is positioned at the bottom end of the contraction section.
Preferably, the upper surface of the rotary slag disk is provided with a slag flowing groove which is arc-shaped.
Preferably, the slag particle spray heads are arranged above the edge position of the rotary slag disk, and the liquefaction spray heads are uniformly arranged on the outer side of the circumference of the slag particle spray heads away from the rotary slag disk; the outer side of the circumference of the liquefaction spray head is uniformly provided with the atomization spray head.
Preferably, the width of the slag flowing groove is gradually reduced from the slag inlet side to the circumferential side, and the depth of the slag flowing groove is gradually increased from the slag inlet side to the circumferential side.
Preferably, the level of the slag particle spray head is higher than that of the atomizing spray head, and the level of the liquefying spray head is between the slag particle spray head and the atomizing spray head.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention discloses a graded-granularity slag granulating device, which comprises a slag charging unit, a granulating unit, a screening unit and a shell, wherein the granulating unit is arranged in the shell and comprises a rotary slag disk and a cooling mechanism, a heating part is arranged on the rotary slag disk, and a slag particle spray head, a liquefying spray head and an atomizing spray head of the cooling mechanism are arranged at the circumferential edge of the rotary slag disk; the slag loading unit comprises a slag pot and a slag discharging channel, the slag discharging channel is arranged at the bottom of the slag pot, and an outlet of the slag discharging channel is positioned above the rotary slag disc; blast furnace slag gradually separates from the rotary slag disc under the action of centrifugal force on the rotary slag disc rotating at high speed, a slag film is formed at the edge of the rotary slag disc, the blast furnace slag at the edge of the rotary slag disc is heated and insulated by the heating part, so that the slag film maintains higher temperature, the slag film has better fluidity, the slag film is reduced, the granularity of granulated slag is reduced, and then the slag liquid separated from the slag film forms granulated slag under the cooling action of the cooling mechanism; the screening unit is positioned at a discharge port below the shell, the screening unit is sequentially provided with an upper layer screen and a lower layer screen from top to bottom, granulated slag moves into the screening unit under the action of gravity, and the screening unit screens the granulated slag to obtain granulated slag with graded particle size;
(2) according to the graded-granularity slag granulating device, the heating part is arranged in the edge area of the rotary slag pan and is used for heating the edge area in a key manner, so that the fluidity of blast furnace slag is ensured, a slag film formed in the edge area of the rotary slag pan is uniformly heated, and the formation of the slag film is reduced;
(3) according to the slag granulating device with graded granularity, the mesh opening diameter of the upper layer sieve is 5mm, and the mesh opening diameter of the lower layer sieve is 1 mm; the upper-layer screen and the lower-layer screen are obliquely arranged, the included angle between the upper-layer screen and the vertical direction is m, the value of m is 40-50 degrees, the included angle between the lower-layer screen and the vertical direction is n, and n and m are complementary; the granulating slag sieve is divided into three size fractions of +5mm, 1-5 mm and-1 mm by the upper-layer sieve and the lower-layer sieve, and the upper-layer sieve and the lower-layer sieve are obliquely arranged to facilitate the granulated slag to smoothly flow out of the sieving unit;
(4) according to the graded-granularity slag granulating device, the slag flowing groove is arranged on the upper surface of the rotary slag tray and is arc-shaped, the width of the slag flowing groove is gradually reduced outwards along the section line direction of the slag flowing groove of the rotary slag tray, and the depth of the slag flowing groove is gradually increased outwards along the section line direction of the slag flowing groove of the rotary slag tray; the blast furnace slag rotating device is beneficial to the blast furnace slag in the rotating slag pan to move along the slag flowing groove, and the width of the slag flowing groove is gradually reduced outwards along the sectional line direction of the slag flowing groove of the rotating slag pan, so that the contact surface of a slag film formed by the blast furnace slag from the edge of the rotating slag pan is reduced, and the blast furnace slag flowing out of the slag flowing groove is beneficial to forming a streamline with certain width, thereby the blast furnace slag is more easily granulated into particles with smaller particle size.
Drawings
Fig. 1 is a schematic structural view of a size-graded slag granulation apparatus according to the present invention;
fig. 2 is a cross-sectional view of a rotating slag pan in a graded-size slag granulation apparatus according to the present invention;
fig. 3 is a top view of a rotating slag pan in a size graded slag granulation apparatus according to the present invention;
FIG. 4 is a sectional view along the section line of the slag runner of the invention;
fig. 5 is a structural diagram of the edge of a rotating slag pan in embodiment 3 of the present invention.
The reference numerals in the schematic drawings illustrate:
100. a slag loading unit; 110. a slag pot; 120. a slag discharge passage;
200. a granulation unit; 210. rotating the slag pan; 211. a heating member; 212. a slag flowing groove; 213. hatching the slag flowing groove; 214. a slag inlet side; 215. a circumferential side; 216. a convex surface; 217. a baffle plate;
220. a cooling mechanism; 221. a slag particle spray head; 222. a liquefaction nozzle; 223. an atomizing spray head; 224. a slag particle injection pump; 225. a slag storage tank; 226. a water mist injection pump; 227. an atomizing tube; 228. a first water pump; 229. a first water storage tank; 230. a second water pump; 23l, a second water storage tank; 232. a stirring member;
400. a screening unit; 410. an upper layer screen; 411. an upper outlet; 420. a lower layer screen; 421. a middle outlet; 430. a lower outlet; 440. a vibrator;
500. a housing; 510. a contraction section; 520. and (4) a discharge port.
Detailed Description
The detailed description and exemplary embodiments of the invention will be better understood when read in conjunction with the appended drawings, where the elements and features of the invention are identified by reference numerals.
Example 1
Referring to fig. 1 to 4, the slag granulation device with graded particle size of the present embodiment includes a slag charging unit 100, a granulation unit 200, a sieving unit 400 and a housing 500, wherein the granulation unit 200 is disposed in the housing 500, the granulation unit 200 includes a rotating slag pan 210 and a cooling mechanism 220, the rotating slag pan 210 is provided with a heating member 211, and a slag particle spray nozzle 221, a liquefaction spray nozzle 222 and an atomization spray nozzle 223 of the cooling mechanism 220 are disposed at a circumferential edge of the rotating slag pan 210; the slag loading unit 100 comprises a slag pot 110 and a slag discharging channel 120, wherein the slag discharging channel 120 is arranged at the bottom of the slag pot 110, and the outlet of the slag discharging channel 120 is positioned above the rotary slag disc 210; the screening unit 400 is located at the discharge port 520 below the housing 500, and the screening unit 400 is provided with an upper screen 410 and a lower screen 420 in sequence from top to bottom. The slag of the invention is mainly blast furnace slag and can also be other metallurgical slag.
Blast furnace slag conveyed from a blast furnace is stored in the slag pot 110 and flows into the rotary slag pan 210 through the slag discharging channel 120, wherein the upper surface of the rotary slag pan 210 is a concave inverted cone with the center, the cone angle of the inverted cone is c, the value range of c is 120-160 degrees, in the embodiment, c is 150 degrees, the concave inverted cone enables the rotary slag pan 210 to have a certain volume, and thus, the flowing blast furnace slag can be stored on the rotary slag pan 210 in a certain amount; meanwhile, the driving motor drives the rotating slag pan 210 to rotate at a high speed (not shown in the drawing), and the rotating slag pan 210 rotating at a high speed makes the blast furnace slag move to the edge of the rotating slag pan 210 under the action of centrifugal force. It is worth noting that when the blast furnace slag moves to the edge of the rotating slag pan 210, the blast furnace slag is easy to form a slag film at the edge of the rotating slag pan 210 due to the high viscosity coefficient of the blast furnace slag and the strong viscosity between the blast furnace slag and the rotating slag pan 210; and because the surface tension of the slag film is large, the slag film is not easy to break, so that the granularity of slag liquid formed by the slag film is large, the granularity of granulated slag formed by cooling the slag liquid is large, and the subsequent resource utilization of blast furnace slag is not facilitated.
It should be noted that the amount of slag film formed at the edge of the rotating slag pan 210 has a great influence on the size of the granulated slag particles; generally, the more slag films, the larger slag droplets generated during crushing, and the larger the particles of granulated slag formed after the slag droplets are cooled; on the contrary, the slag film is less, the slag drops formed after the slag film is crushed are smaller, and the granules of the granulated slag formed after the slag drops with small granules are cooled are smaller, so that the subsequent resource utilization of the blast furnace slag is facilitated.
In this embodiment, be provided with heating element 211 on the rotatory slag pan 210, heating element 211 is silicon molybdenum rod heating or electromagnetic heating, heats the heat preservation through heating element 211 to the blast furnace slag in the rotatory slag pan 210, improves the mobility of blast furnace slag, reduces its coefficient of viscosity, and then can reduce the viscosity between blast furnace slag and the rotatory slag pan 210, avoids forming too much slag film between blast furnace slag and the rotatory slag pan 210. It should be mentioned that, in this embodiment, the heating component 211 is disposed at the edge region of the rotating slag pan 210, and the heating component 211 heats and preserves the temperature of the blast furnace slag at the edge of the rotating slag pan 210, so as to heat the edge region in a focused manner, ensure the fluidity of the blast furnace slag at the edge region of the rotating slag pan 210, and uniformly heat the slag film at the edge region of the rotating slag pan 210.
In addition, the upper surface of the rotary slag pan 210 is provided with a slag flowing groove 212, the slag flowing groove 212 is arc-shaped, and the arc bending direction of the slag flowing groove 212 faces the rotating direction of the rotary slag pan 210; the width of the slag flowing groove 212 is gradually reduced from the slag inlet side 214 to the circumferential side 215, and the depth of the slag flowing groove 212 is gradually increased from the slag inlet side 214 to the circumferential side 215; blast furnace slag falls to the central part of the upper surface of the rotary slag pan 210 through the slag discharging channel 120, the blast furnace slag falling to the upper surface of the rotary slag pan 210 has certain fluidity, the width of the slag flowing groove 212 is gradually reduced from the slag inlet side 214 to the circumferential side 215, so that the blast furnace slag at the central part moves to the edge part of the rotary slag pan 210 through the flow guiding and gathering action of the slag flowing groove 212, a slag film with a large area is prevented from being formed at the edge part of the rotary slag pan 210 by the blast furnace slag, the blast furnace slag moves out from the slag flowing groove 212 in a long strip shape under the action of centrifugal force, and the blast furnace slag can be more easily granulated into particles with smaller particle size; in addition, the depth of the slag flowing groove 212 gradually increases from the slag inlet side 214 to the circumferential side 215, so that the flow guiding effect of the slag flowing groove 212 at the edge of the rotary slag disk 210 is enhanced, and the formation of a slag film is further limited.
Example 2
The basic contents of this embodiment are the same as embodiment 1, except that: the slag particle spray heads 221 are arranged above the edge of the rotary slag disk 210, in the embodiment, 16 slag particle spray heads 221 are arranged, and the slag particle spray heads 221 are uniformly distributed along the circumference above the edge of the rotary slag disk 210. Slag particle shower nozzle 221 passes through the gas in this embodiment to be the carrier, to the less graining sediment of rotatory slag pan 210 edge injection granularity, and the carrier that sprays the graining sediment also can be other fluids such as water, and its effect lies in: on one hand, the granulated slag with a certain kinetic energy and the blast furnace slag at the edge of the rotary slag disk 210 are impacted, fused and grown up by spraying the granulated slag with smaller granularity, so that the granulated slag which does not meet the resource utilization condition before is subjected to secondary production and utilization; on the other hand, the slag film is broken through the impact action of the granulated slag with smaller granularity and the gas-based carrier, and the formed slag liquid particles are prevented from being too large to influence the quality of the granulated slag. The slag particle spray heads 221 are uniformly provided with liquefaction spray heads 222 along the outer side of the circumference far away from the rotating slag disk 210, in the embodiment, the number of the liquefaction spray heads 222 is 16, the liquefaction spray heads 222 are uniformly distributed along the circumference, and the liquefaction spray heads 222 are used for cooling slag liquid falling from a slag film; the circumference outside of liquefaction shower nozzle 222 has evenly arranged atomizer 223, and the quantity of atomizer 223 of this embodiment is 16, and the shower nozzle direction of atomizer 223 sets up corresponding with liquefaction shower nozzle 222 towards rotatory slag pan 210, and this atomizer 223 is used for cooling the slag liquid that drops out from the slag film.
It is worth to be noted that an included angle between the spraying direction of the slag particle spray head 221 and the horizontal direction is a, a is 45-90 °, and the value of a mainly depends on the rotation speed of the rotary slag pan 210, the viscosity of the blast furnace slag, and the cone angle c of the rotary slag pan 210, in this embodiment, c is 150 °, a is 75 °, and when the rotation speed of the rotary slag pan 210 is higher, the viscosity of the blast furnace slag is lower, and the cone angle c of the rotary slag pan 210 is higher, the value of a is smaller, and vice versa, the value of a is larger; the function is as follows: a is properly selected to enhance the crushing effect of the granulated slag sprayed from the slag particle spray nozzle 221 on the slag film at the edge area of the rotating slag disk 210 and reduceThe granularity of the slag liquid falling from the slag film; in addition, the included angle between the spraying direction of the liquefaction sprayer 222 and the vertical direction is b, the value of b is 60-85 degrees, the value of b mainly depends on the movement track of the slag liquid, b is 75 degrees in the embodiment, the larger the included angle between the movement track of the slag liquid and the horizontal direction is, the smaller the value of b is, otherwise, the larger the included angle is, the larger the value is, the effect is that: b is a proper value, so that the water flow sprayed by the liquefaction nozzle 222 can be better contacted with the moving slag liquid, and part of the slag liquid at the rear edge of the slag liquid is better cooled, wherein the rear edge of the slag liquid refers to the part of the slag liquid which is relatively behind in the movement process of the slag liquid. The slag particle spray head 221 has a horizontal height higher than that of the atomizing spray head 223, and the liquefaction spray head 222 has a horizontal height between the slag particle spray head 221 and the atomizing spray head 223, so as to make the atomizing spray head 223 spray atomized water or atomized water CaF2The powder mixture cools the front part of the slag liquid, and the front part of the slag liquid refers to the part of the slag liquid which is positioned at the front part in the movement process of the slag liquid. The working principle is as follows: the cooling speed of the front edge of the slag liquid is high, and the cooling speed of the rear edge of the slag liquid is low, so that the cooling speed of the slag liquid is not uniform, the formed glass is not uniform, and the quality of granulated slag is adversely affected; therefore, water flow is sprayed in the direction along the movement track of the slag liquid, the cooling effect of the rear edge of the slag liquid is enhanced, water mist is sprayed at the front edge of the slag liquid, the cooling strength of the front edge of the slag liquid is properly supplemented, the movement of the slag liquid is not influenced by the sprayed water mist, the front edge of the slag liquid and the rear edge of the slag liquid are uniformly cooled, the cooling speed of the slag liquid is accelerated, and the granulation rate of the blast furnace slag is improved.
The slag particle spray head 221 is connected with the slag storage tank 225 through the slag particle injection pump 224, a stirring component 232 is arranged in the slag storage tank, the stirring component 232 is used for stirring granulated slag in the slag storage tank 225 to prevent the granulated slag from depositing at the bottom of the slag storage tank, and slag particles stored in the slag storage tank 225 are sprayed to the edge of the rotary slag disk 210 through the slag particle spray head 221 to form a slag film under the action of the injection pump 224; the atomizing nozzle 223 is connected to an atomizing pipe 227 through a water mist blowing pump 226, the atomizing pipe 227 is connected to a first water storage tank 229 through a first water pump 228, water stored in the first water storage tank 229 is sprayed into the atomizing pipe 227 by the first water pump 228, and the water mist blowing pump 2 is used for blowing water mist into the atomizing pipe 22726, a large amount of air flowing at high speed is sucked into the atomizing pipe 227, the air flowing at high speed generates impact action on water in the atomizing pipe 227 to atomize the water, and the atomized water is sprayed onto the slag liquid through the water mist spraying pump 226 and the atomizing nozzle 223; the liquefaction spray head 222 is connected to a second water storage tank 231 through a second water pump 230, and the water or water and CaF stored in the second water storage tank 2312The powder mixture is sprayed onto the slag liquid by the second water pump 230 to cool the liquid droplets.
The using method of the slag granulation device with graded granularity comprises the following steps:
step 1: the blast furnace slag stored in the slag pot 110 flows into the rotary slag pan 210 through the slag discharging passage 120;
step 2: the rotating slag pan 210 rotates to enable blast furnace slag to flow towards the edge along the slag flowing groove 212 on the rotating slag pan 210 under the action of centrifugal force, the heating component 211 arranged on the rotating slag pan 210 is located at the edge position of the rotating slag pan 210, and the heating component 211 heats and preserves the temperature of the blast furnace slag at the edge position of the rotating slag pan 210 to inhibit the blast furnace slag from forming a slag film at the edge position of the rotating slag pan 210.
And step 3: blast furnace slag forms a slag film at the edge of the rotary slag pan 210, slag particle spray heads 22l arranged above the edge of the rotary slag pan 210 spray fine-grained slag to the slag film, blast furnace slag forms slag liquid after separating from the rotary slag pan 210, a liquefaction spray head 222 of a cooling mechanism 220 sprays water flow to the slag liquid for cooling, an atomization spray head 223 sprays water mist to the slag liquid for cooling, and the slag liquid of the blast furnace slag is granulated in the forced cooling process;
and 4, step 4: the granulated slag moves to the bottom of the shell 500 under the action of gravity, the shrinkage section 510 at the bottom of the shell 500 enables the granulated slag to be gathered and fall into the screening unit 400 from the discharge hole 520 at the bottom of the shell 500, the screening unit 400 is sequentially provided with the upper-layer screen 410 and the lower-layer screen 420 from top to bottom, oversize products of the upper-layer screen 410 are discharged from the upper outlet 411, undersize products of the upper-layer screen 410 fall into the lower-layer screen 420, oversize products of the lower-layer screen 420 are discharged from the middle outlet 421, undersize products of the lower-layer screen 420 fall into the bottom of the screening unit 400 and pass through the lower outlet 430, and the screening unit 400 screens the granulated slag in a vibrating process to obtain granulated slag with three grain fractions of-1 mm, 1-5 mm and +5 mm.
Example 3
The basic content of this embodiment is the same as that of embodiment 1, except that a raised surface 216 is provided between two adjacent slag flowing grooves 212, and the two ends of the circumferential edge of the raised surface 216 are provided with baffles 217, so that the baffles 217 are located at the two sides of the slag outlet of the slag flowing groove 212, and the slag outlet of the slag flowing groove 212 is the circumferential side 215. the function of this embodiment is that the blast furnace slag on the rotating slag pan 210 moves to the edge of the rotating slag pan 210 under the action of centrifugal force, part of the blast furnace slag flows out through the slag outlet along the slag flowing groove 212, and part of the blast furnace slag flows onto the raised surface 216 and then to the circumferential edge of the raised surface 216, and when the blast furnace slag moves to the circumferential edge of the raised surface 216, the blast furnace slag is blocked by the baffles 217, and is inhibited from flowing out from above the slag outlet of the slag flowing groove 212, and the two parts of the blast furnace slag are prevented from mixing with each other to form a slag film, and the height of the1The height of the baffle 217 far away from the position corresponding to the slag outlet of the slag groove 212 is L2，L1＞L2Thereby reducing the mixing of the blast furnace slag at the circumferential edge of the raised surface 216 and the blast furnace slag in the slag runner 212 and improving the separation effect of the blast furnace slag and the slag runner.
Example 4
The basic contents of this embodiment are the same as embodiment 1, except that: the lower part of the housing 500 is provided with a contraction section 510, and the discharge hole 520 of the housing 500 is located at the bottom end of the contraction section 510. The granulated slag moves to the bottom of the shell 500 under the action of gravity, and the shrinkage section 510 at the bottom of the shell 500 enables the granulated slag to be gathered; the screening unit 400 is positioned at a discharge port 520 below the shell, and the granulated slag falls into the screening unit 400 from the discharge port 520 at the bottom of the shell 500; the screening unit 400 is sequentially provided with an upper layer screen 410 and a lower layer screen 420 from top to bottom, the bottom end of the upper layer screen 410 and the top end of the lower layer screen 420 are positioned on the same side, the mesh size of the upper layer screen 410 is 5mm, the mesh size of the lower layer screen 420 is 1mm, and the granulated slag screen is divided into three size fractions of +5mm, 1-5 mm and-1 mm by the upper layer screen 410 and the lower layer screen 420; the upper-layer sieve 410 and the lower-layer sieve 420 are obliquely arranged to be beneficial to granular slag to smoothly flow out of the sieving unit, an included angle between the upper-layer sieve 410 and the vertical direction is m, the value of m is 40-50 degrees, an included angle between the lower-layer sieve 420 and the vertical direction is n, n and m are complementary, m is 45 degrees, and n is 45 degrees in the embodiment; in addition, a vibrator 440 is further provided at a lower end of the sieving unit 400, and the vibrator 440 vibrates the sieving unit 400, which is advantageous for improving the sieving effect of the sieving unit 400. The sieving unit 400 is provided with an upper outlet 411, a middle outlet 421 and a lower outlet 430, wherein the upper outlet 411 is arranged corresponding to the bottom end of the upper layer sieve 410, and the middle outlet 421 is arranged corresponding to the bottom end of the lower layer sieve 420; the lower outlet 430 is located at the bottom of the sieving unit 400; during the vibration of the sieving unit 400, oversize of the upper sieve 410 is discharged from the upper outlet 411, undersize of the upper sieve 410 falls to the lower sieve 420, oversize of the lower sieve 420 is discharged from the middle outlet 421, undersize of the lower sieve 420 falls to the bottom of the sieving unit 400 and is discharged from the lower outlet 430.
The screened-1 mm size fraction granulated slag can be conveyed into a slag storage tank 225, and the-1 mm size fraction granulated slag is sprayed onto a slag film through a slag particle spray head 221 under the driving of a slag particle spray pump 224 to crush the slag film; recycling granulated slag with the grain size of 1-5 mm, and being used for manufacturing cement and the like; and crushing and recycling the granulated slag with the grain size of +5 mm.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.

Claims (9)

1. A graded-size slag granulation device, characterized in that: the slag granulation device comprises a slag loading unit (100), a granulation unit (200), a screening unit (400) and a shell (500), wherein the granulation unit (200) is arranged in the shell (500), the granulation unit (200) comprises a rotary slag disk (210) and a cooling mechanism (220), a heating part (211) is arranged on the rotary slag disk (210), and a slag particle spray head (221), a liquefaction spray head (222) and an atomization spray head (223) of the cooling mechanism (220) are arranged on the circumferential edge of the rotary slag disk (210);
the slag loading unit (100) comprises a slag pot (110) and a slag discharging channel (120), the slag discharging channel (120) is arranged at the bottom of the slag pot (110), and an outlet of the slag discharging channel (120) is positioned above the rotary slag disc (210);
the screening unit (400) is positioned at a discharge hole (520) below the shell (500), and the screening unit (400) is sequentially provided with an upper-layer screen (410) and a lower-layer screen (420) from top to bottom; wherein, the heating member (211) is heated by a silicon-molybdenum rod or by electromagnetic heating, the heating member (211) is arranged at the edge of the rotary slag disk (210), and the heating temperature of the heating member (211) is 1250-1350 ℃.
2. A size graded slag granulation apparatus as claimed in claim 1, wherein: the mesh aperture of the upper layer screen (410) is 5mm, and the mesh aperture of the lower layer screen (420) is 1 mm; the upper-layer screen (410) and the lower-layer screen (420) are obliquely arranged, an included angle between the upper-layer screen (410) and the vertical direction is m, the m value is 40-50 degrees, an included angle between the lower-layer screen (420) and the vertical direction is n, and n and m are complementary.
3. A size graded slag granulation installation as claimed in claim 2, wherein: the bottom end of the upper screen (410) is on the same side as the top end of the lower screen (420).
4. A size graded slag granulation installation as claimed in claim 2, wherein: the screening unit (400) is provided with an upper outlet (411), a middle outlet (421) and a lower outlet (430), wherein the upper outlet (411) is arranged corresponding to the bottom end of the upper-layer screen (410), and the middle outlet (421) is arranged corresponding to the bottom end of the lower-layer screen (420); the lower outlet (430) is located at the bottom of the sieving unit (400).
5. A size graded slag granulation installation as claimed in claim 2, wherein: the lower part of casing (500) is provided with shrink section (510), and discharge gate (520) of casing (500) are located the bottom of shrink section (510).
6. A size graded slag granulation apparatus as claimed in claim 1, wherein: the upper surface of the rotary slag tray (210) is provided with a slag flowing groove (212), and the slag flowing groove (212) is arc-shaped.
7. The size graded slag granulation installation according to any one of claims 1 and 6, wherein:
the slag particle spray head (221) is arranged above the edge position of the rotary slag disk (210), and the liquefaction spray heads (222) are uniformly arranged on the outer side of the circumference of the slag particle spray head (221) far away from the rotary slag disk (210); the circumference outside of the liquefaction spray head (222) is uniformly provided with the atomization spray heads (223).
8. The size graded slag granulation installation according to any one of claims 1 and 6, wherein:
the width of the slag flowing groove (212) is gradually reduced from the slag inlet side (214) to the circumferential side (215), and the depth of the slag flowing groove (212) is gradually increased from the slag inlet side (214) to the circumferential side (215).
9. A size graded slag granulation apparatus as claimed in claim 3 or 4, wherein: the level of the slag particle spray head (221) is higher than that of the atomizing spray head (223), and the level of the liquefying spray head (222) is between the slag particle spray head (221) and the atomizing spray head (223).
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CN203096086U (en) * 2013-03-06 2013-07-31 圣火科技(河南)有限责任公司 Rotary revolving cup for centrifuging and granulating slag of dry quenching slag device
CN103757155A (en) * 2013-12-27 2014-04-30 河南圣石节能环保工程有限公司 Coke dry quenching water mist granulation device
CN203737571U (en) * 2014-03-14 2014-07-30 王延青 Multistage soybean meal classifying screen
RU2016104804A (en) * 2014-06-03 2017-08-17 Хэтч Лтд. METHOD AND DEVICE FOR DRY SLAG GRANULATION WITH DECREASED SLAGING
CN108193006B (en) * 2018-01-13 2019-06-28 秦皇岛点知汇科技有限公司 A kind of centrifugal slag granulation and residual neat recovering system
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Patentee before: ANHUI University OF TECHNOLOGY