WO1995015929A1

WO1995015929A1 - Slag granulation method and container by air crushing

Info

Publication number: WO1995015929A1
Application number: PCT/CN1994/000098
Authority: WO
Inventors: Yongzhi Li; Tianfu Geng; Kaiji Li; Shirong Xia; Yi Peng; Bin Ye; Guomin Hu; Changjian Miao; Shuqi Lai; Shimin Li; Zhenqiang Zhou
Original assignee: Chengdu Iron & Steel Works
Priority date: 1993-12-11
Filing date: 1994-12-09
Publication date: 1995-06-15
Also published as: AU683520B2; CN1103667A; AU1190195A

Abstract

The present invention provides a granulation container and method, which comprises tilting mechanism (1) of sludge ladle, sludge ladle (2), tundish (3), granulator (9), water tank (4), barrier wall (7), jet device (6) of cold water for dust elimination and air current (8). The molten slag is poured into the tundish from the sludge ladle by the means of the tilting mechanism. The molten slag flows down from a slag launder of the tundish and then is dispersed by compressed air from small holes which are arranged in the form of or | 1 before the granulator enters into the device for dust elimination to cool and set. The set slag drops into the water tank. The slag particles in the water tank are moved away by a clamshell.

Description

Method and device for slag gas granulation

The invention relates to a method and a device for granulating slag, in particular to a method and a device for granulating and granulating copper slag. Background technique

Most of the existing metallurgical slags are treated by water crushing, hot stuffing, hot splashing or water cooling. For example, Japanese Patent No. 8120.061 discloses a technology for blowing slag of a converter with compressed air and cooling it with water. Utilizing this patent, it is sprayed under water pressure of 0.7Mpa, water-cooled, the granulation rate reaches 91%, and the air consumption is 500-1000N Vt slag.

Chinese Patent No. ⁸⁸² 11 ²⁷⁶ · ⁷ discloses a steel slag wind granulation device, which is composed of a tundish, a granulator, and a pool. The bottom of the tundish and the flow slot have a certain slope. The granulator uses compressed air as the air source, and the front side is arranged with a sparge-shaped spray hole.

However, the above existing technologies have the following disadvantages:

1. The steel slag ladle needs to be hoisted and tilted to the tundish by a crane. The working conditions are harsh, unsafe, and the productivity is not high.

^2. The granulator with nozzles arranged in a Η shape has a high air consumption and a low utilization rate of compressed air.

3. Gas is used as the gas source of the granulator. The residual molten steel is severely oxidized during granulation. The air pollution is serious and an air compressor and a gas supply line need to be installed. The gas source investment is large.

4. There is no safety retaining wall between the tundish slag tank and the pool, and there are hidden safety hazards in special cases.

5. There is no dust removal system, and the environmental pollution is severe during windbreak operation. Disclosure of invention

The purpose of the present invention is to provide a method and a device for slag gas granulation with simple process, saving investment, convenient operation, safe and reliable, saving energy, eliminating environmental pollution and high productivity.

The slag gas granulation method according to the present invention includes the following steps:

1) The slag bag full of liquid metallurgical slag is hoisted to the support frame of the tipping mechanism. The tipping mechanism gradually tilts the slag bag, and the liquid slag is poured into the tundish. Outflow of slag tank;

2) After the slag flows out of the flow tank, the compressed gas from the gas source is ejected from the nozzle of the granulator Slag crushing

3) The crushed liquid slag drops are removed by the dust removal device around the pool;

4) The crushed liquid slag droplets are cooled and solidified during forward flight, forming spherical slag particles, which are scattered in the sediment pool for further cooling;

5) Use a grab to remove the slag particles from the pool.

According to the slag gas granulation method of the present invention, compressed gas or compressed gas is used as the gas source, and the working pressure of the gas source is 0.2 to 0.6 Mpa, and the gas consumption per ton of granulated slag is 30-100Nm ³ / t _o The slag gas granulation device according to the present invention includes: a slag bag overturning device, a tundish, a granulator, a pool, a slag retaining wall and a gas source; a slag bag overturning mechanism for liquid The slag is tipped to the tundish; the liquid slag flows out of the tundish. The granulator is located below the tundish and is connected to an air source. The slag breaks and falls into the pool.

In the granulator of the present invention, the pore diameter of the bottom row of the spray holes is larger than the pore diameters of both sides. The angle of the centerline of the vertical apertures on both sides can be varied from 0-120 °.

The slag gas granulation device of the present invention further includes a dust removal device. The device is composed of a water pipe arranged around the water pool, and a plurality of spray holes are distributed on the water pipe, and a dustproof leather is added to the pool.

The overturning mechanism provided by the slag gas granulation device of the present invention is used to overturn the slag containing bag, so that the slag therein is poured into the tundish. The tipping mechanism further includes a slag bag supporting mechanism and a positioning device for preventing the slag bag from tipping over and falling off.

The slag gas granulation device of the present invention is further provided with a slag retaining wall to prevent the slag from flowing into the pool and causing an explosion, and the slag retaining wall is located between the granulator and the pool. Description of the drawings

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a general layout diagram of the present invention;

Figure 2 is a top view of Figure 1, (remove dust prevention leather);

Figure 3 shows the dump bag tilting mechanism of the device of the present invention;

4 is a top view of FIG. 3;

Figure 5 shows the structure of the slag pack of the device of the present invention;

FIG. 6 is a U-shaped structure of the granulating nozzle of the device of the present invention;

Fig. 7 shows a u-shaped structure of the granulator nozzle holes of the device of the present invention. Detailed description of the examples ■

When the slag bag 2 filled with slag is hoisted on the tilting frame 1 by a crane, the hydraulic cylinder 19 is started, The slag package gradually tipped, and the slag was poured into the tundish 3. The slag poured into the tundish flows through the tundish slag 28 to the front of the granulator 9 by the action of gravity. The high-speed air flow ejected from the granulator crushes the slag. Due to the effect of surface tension, it is hit The broken liquid slag droplets are quickly cooled and solidified in the dust-proof water curtain, forming spherical particles with a particle size of about 2 mm, which are scattered in the sediment pool ⁴ . Grab ⁵ removes the completely cooled and solidified slag from pool 4 and removes it by transport.

In the slag granulation method provided by the present invention, the gas source of the granulator uses a large amount of surplus nitrogen or steam from a metallurgical plant, and compressed air can also be used. Nitrogen has the effect of preventing oxidation of residual metal in the slag. In the embodiment of the present invention, the granulator uses nitrogen, and the working pressure of compressed nitrogen is 0.2-0.6Mpa, the gas consumption is 30-50Nm ³ / t, and the ability to treat slag is 2- 3, 5t / min. ₀

As shown in the figure, a slag granulation device according to an embodiment of the present invention includes a slag bag tilting mechanism 1, a slag bag 2, a tundish 3, a granulator 9, a pool 4, a slag retaining wall 7, Dedusting device 6, air source 8. The tipping mechanism, as shown in FIG. 3, is mainly composed of three parts, that is, a slag bag supporting mechanism 10, a tipping frame 16, and a hydraulic tipping system. A support ear 12 is provided on the upper end of the support 10, and a supporting shaft 13 of the tilting frame 16 is placed in the supporting ear 12. The tilting frame 16 is further provided with a positioning base 17 and another supporting ear is formed on the positioning base 17. The hydraulic system is hinged under the tilting frame through the piston rod of the hydraulic cylinder 19, and the iris of the hydraulic cylinder 19 and the support 20 are hinged. The slag pack 2 has a shaft ²¹ and positioning 4 to 22, and the positioning shaft cooperates with the supporting ears on the positioning base 17 on the tilting frame. When the slag pack 2 is placed on the tipping frame 16, by starting the hydraulic system, the piston of the hydraulic cylinder I ⁹ connected to the bottom of the tipping frame 16 moves upward, so that the entire tipping frame rotates within the support ear 12. At this time, the slag bag placed on the tipping rack gradually tipped with the rotation of the tipping rack, and the slag was gradually poured into the tundish. Because the front end of the support ear 12 has a protrusion, the protrusion can play a positioning role, and can ensure that the slag pack does not leave the tipping mechanism during the tipping process.

A tundish 3 is provided on the tundish 3.

Figures 6 and 7 show that the nozzles of the granulator of the present invention are U-shaped and! ^ -Shaped arrangement. The hole diameters 23 of the nozzle holes provided on the side 24 of the granulator 9 which are directly opposite to the slag are not the same. Generally, the holes in the bottom row of the holes with a ϋ-shaped or W-shaped arrangement are larger in diameter than the vertical holes on both sides. Changes between Φ 4-14. The angle between the centerlines of the vertical apertures on both sides can be between 0-120. Changes within range.

As shown in FIG. 1, the dust-removing device 6 of the present invention is provided at the periphery of the pool 4. The device is composed of a water pipe 11, and water spray holes are arranged in the water pipe 11. A slag retaining wall 7 is provided on the side of the pool 4 near the granulator. The slag retaining wall is a water-cooled steel jacket. Because of its location between the tundish slag tank and the pool, when special conditions occur, such as sudden power failure Can avoid slag flow Into the pool to completely eliminate the hidden danger of explosion. During the operation, the water pipe 11 sprays water to form a water curtain around the pool. The cooling and solidification process of the crushed liquid slag droplets is performed in the water curtain, which effectively prevents dust pollution. Adding a dust cover to the outside of the entire pool can effectively prevent water mist and dust mist from spreading and protect the environment.

According to the embodiment of the present invention, the slag pack 2, the tundish 3, and the tipping mechanism 1 are located on a platform. The cylinder of the hydraulic cylinder 19 is hinged with the support 20 located in the pit. The granulator 9 is provided on the side wall of the platform. Below the slag slag tank, a slag retaining wall is arranged between the tundish slag slag tank and the pool.

The slag gas granulation method and device provided by the present invention have the following advantages:

1. The process is very simple, the floor space is small, and the investment is small. Under the premise of the same amount of liquid slag treatment, the investment of the main equipment used is only one tenth to several tenths of the existing process.

2. Large processing capacity and complete granulation. It can process slag 2-3.5t per minute. The diameter of the slag after treatment is 0.1 to 6 bands. Most of the particles are less than 21 ^ 95% of the slag flowing out of the tundish can be granulated. The granulated slag particles are easily powdered.

3. The water consumption is very small, and only the amount of water consumed by evaporation needs to be replenished into the pond. There is no sewage discharge and no secondary pollution will be caused.

^4. Safe and reliable. Because the granulator has a certain safety distance from the pool, a slag retaining wall is set up to cope with the accident. The potential danger of injury from the explosion was completely eliminated. The unique hydraulic tipping mechanism enables workers to control the tipping of liquid slag at a long distance, with good safety and improved working conditions and intensity.

5. Low air consumption and low energy consumption. The optimal gas consumption is 40-60Nm ³ / t slag, while the Fukuyama Iron and Steel Plant in Japan consumes 500-1000Nm ³ / t. The gas source can use a large surplus of nitrogen or steam from the metallurgical plant (compressed air can also be used). The use of nitrogen or steam can prevent the oxidation of residual metals in the slag, which can not only reduce environmental pollution, but also improve the recovery rate of residual metals. It can save a lot of energy and improve the comprehensive benefit of the steel mill.

6. Granulated steel slag is convenient for comprehensive utilization. It is an ideal substitute for the production of cement clinker. With small grains and easy grinding, it is very popular among cement plants. In addition, steel slag can also be used as sintering raw material or blast furnace flux, and it can also be used as agricultural phosphate fertilizer after wind crushing in the early stage.

The device of the invention is simple, the design is advanced, and the effect is remarkable. The hydraulic tipping mechanism and slag pack are safe and reliable, improving working conditions and productivity. The granulators with different apertures and the spray holes in a "U" or shaped arrangement are scientifically and rationally designed, regardless of whether it is slag or metal liquid, which can be safely granulated and dispersed into the slag pool, with low gas consumption and granulation The rate is high. The slag retaining wall can completely avoid the hidden danger of explosion of slag when it encounters water in the event of a power outage or gas outage. The dust removal device improves the working environment and significantly reduces the dust content in the air.

The process and the device of the invention have low investment, high productivity, low energy consumption, comprehensive economic benefits and The environmental protection effect is good, and it can be widely applied to the treatment of converter slag, open hearth, electric furnace steel slag, blast furnace smelting slag and non-ferrous smelting slag in metallurgical industry.

Claims

Claim

1. Slag gas granulation device includes a slag bag tilting device (1), a tundish (3), a granulator (9), a pool (4), a slag wall (7) and gas The slag container tilting device (1) is used to tip liquid slag to a tundish (2), the slag flows out of the tundish, the granulator is located below the tundish and is connected to an air source Connected, the granulator has U-shaped or U-shaped spray holes in front of it to spray high-speed air flow to crush the liquid residue and fall into the pool.

2. The slag gas granulating device according to claim 1, wherein the hole diameter of the bottom row of the spray holes is larger than the hole diameters on both sides, and the angle between the centerlines of the vertical row hole diameters on both sides can be in the range of 0-120. Within range.

3. The slag gas granulation device according to claim 1 or 2, further comprising a dust removal device (6),

4. The slag gas granulation device according to claim 3, the dust removal device (6) further comprises a water spray pipe with small holes distributed on the side of the pool, and a dust-proof army arranged outside the pool .

5. The slag gas granulation device according to claim 1, wherein the slag bag tilting mechanism (1) further comprises a slag bag support mechanism and a positioning device for preventing the slag bag from tipping over and falling off.

6. The slag gas granulation device according to claim 1, wherein the slag retaining wall (7) is located between the granulator (9) and the pool (4).

7. Slag gas granulation method includes the following steps:

1) The slag bag full of liquid metallurgical slag is hoisted to the support frame of the tipping mechanism. The tipping mechanism gradually tilts the slag bag, and the liquid slag is poured into the tundish. Outflow trough;

2) After the slag flows out of the slag tank, the compressed gas from the gas source is ejected from the nozzle of the granulator to crush the slag;

4) The crushed liquid slag droplets are cooled and solidified during forward flight, forming spherical slag particles, which are scattered in the sediment pool for further cooling.

5) Use a grab to remove the slag particles from the pool.

Slag 8. The method of gas nibs fans claim 7, wherein the working pressure of the gas source 0. ² - 0. 6Mpa, using compressed nitrogen or steam.

9. The slag gas granulation method according to claim 8, wherein the gas source uses compressed air.