Dry and wet material mixing device for comprehensive utilization of electric furnace ash and metallurgical dust and mud

Abstract

The invention relates to a dry and wet material mixing device for comprehensive utilization of electric furnace ash and metallurgical dust and mud. The dry and wet material mixing device comprises a metallurgical dust and mud feeding device, an electric furnace ash feeding device and a vertical strong mixing machine, the metallurgical dust and mud feeding device comprises a double-spiral discharging device, a feeding hopper and a side wall hydraulic material cleaning device. The feeding direction of the double-helix discharging device is horizontal, a feeding port of the double-helix discharging device is located in the upper portion and is in a long strip shape, the feeding hopper is in a cone strip shape corresponding to the feeding port, and side wall hydraulic material cleaners are arranged on the two inner end faces of the feeding hopper in an attached mode and used for scraping metallurgical dust and mud attached to the two inner end faces of the feeding hopper. A supporting piece is fixedly arranged on the upper portion of the feeding hopper, a hanging material stopper is hung on the supporting piece, the lower portion of the hanging material stopper is of a small hopper structure attached to the feeding hopper in a profiling mode, the upper portion of the hanging material stopper is a plurality of vertical rod pieces, the lower ends of the vertical rod pieces are fixedly connected with the small hopper structure, and the upper ends of the vertical rod pieces are hung on the supporting piece. And the lower end of the electric stove ash feeding device is intersected with the double-helix discharging device and is over against the vertical strong mixing machine.

Description

Technical Field

[0001] This invention relates to a dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge, belonging to the field of metallurgical production technology. Background Technology

[0002] The high zinc and calcium oxide content in electric arc furnace ash makes it unsuitable for direct use in ironmaking. Pre-treatment is necessary before it enters the rotary hearth furnace for zinc removal and disposal. This is because the high calcium oxide content in the ash combines with moisture during mixing in the rotary hearth furnace, releasing a large amount of heat. This high temperature causes the material to lose moisture, expand and disintegrate after pelletizing, making it difficult to form pellets. Furthermore, the pellets formed have low strength, easily cracking and crumbling during vibrating screening, and are difficult to sinter into shape in the furnace, resulting in severe pulverization of the finished product and affecting the reduction effect. Therefore, pre-treatment to digest and passivate the ash before rotary hearth furnace batching is essential to mitigate the adverse effects of calcium oxide on the furnace.

[0003] Mixing electric furnace ash and metallurgical dust at a suitable moisture content before storage and digestion allows for the early decomposition of calcium oxide in the electric furnace ash, thus avoiding adverse effects on subsequent pelletizing. Therefore, the rational utilization of electric furnace ash and metallurgical dust can achieve the environmental protection goal of "no solid waste leaving the factory" for metallurgical enterprises.

[0004] In existing technologies, the mixing of electric furnace ash and metallurgical dust is mostly done manually, which is inefficient and generates a lot of dust from the dry ash. Existing mechanical mixing methods have problems such as uneven material distribution and metallurgical dust sticking to the walls. Summary of the Invention

[0005] The purpose of this invention is to provide a dry and wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge, which improves the efficiency and uniformity of mixing electric furnace ash and metallurgical dust and sludge, and solves the problem of metallurgical dust and sludge sticking to the wall during feeding.

[0006] The present invention adopts the following technical solution:

[0007] A dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge includes a metallurgical dust and sludge feeding device 1, an electric furnace ash feeding device, and a vertical high-intensity mixer 6. The metallurgical dust and sludge feeding device 1 includes a double-spiral discharge device 105, a feeding hopper 106, and a sidewall hydraulic cleaner 101. The feeding direction of the double-spiral discharge device 105 is horizontal, and its inlet is located at the top and is elongated. The feeding hopper 106 is a corresponding conical shape. The two inner end faces of the feeding hopper 106 are attached with the sidewall hydraulic cleaner 101 for scraping off the dust and sludge adhering to the feeding hopper 106. Metallurgical dust and sludge on the two inner end faces of 06; A support member 107 is fixedly installed on the upper part of the feeding funnel 106, and a hanging baffle 102 is hung on the support member 107. The lower part of the hanging baffle 102 is a small funnel structure 102b that is attached to the feeding funnel 106 in a similar shape, and the upper part is connected to multiple vertical rods 102a. The lower end of the vertical rods 102a is fixedly connected to the small funnel structure 102b, and the upper end is hung on the support member 107; The electric furnace ash feeding device is set vertically, and its lower end intersects with the double spiral discharge device 105 and is directly opposite the vertical strong mixer 6.

[0008] Preferably, the small funnel structure 102b is a rigid structure made of polymer material, and there is a gap of 5-10cm between it and the inner wall of the feed funnel 106. When the metallurgical dust and sludge fall, it impacts the small funnel structure 102b, causing it to shake.

[0009] Preferably, the sidewall hydraulic cleaner 101 has a power component and a scraper component. The power component is fixed on the support 107, and the scraper component is oriented downward and swings in a fan shape.

[0010] Preferably, the lower part of the metallurgical dust and sludge feeding device 1 is equipped with an electronic belt scale 2.

[0011] Preferably, the electric furnace ash feeding device includes, from top to bottom, an ash hopper 3, a screw feeder 4, and a scraper conveyor 5; the lower end of the scraper conveyor 5 is aligned with the feed inlet of the vertical high-intensity mixer 6.

[0012] Preferably, a conveyor belt 8 is provided below the discharge port of the vertical strong mixer 6, and the conveyor belt 8 is equipped with a moisture prior monitoring device 7.

[0013] Preferably, the suspended baffle 102 is made of rubber, and multiple vertical rods 102a form a rubber curtain.

[0014] The beneficial effects of this invention are as follows:

[0015] 1) Improve the efficiency and uniformity of mixing electric furnace ash and metallurgical dust: A vertical high-intensity mixer is used as a powerful mixing device for metallurgical dust and electric furnace ash. The feed inlet is aligned with the lower end of the electric furnace ash feeding device and is horizontally connected to the metallurgical dust feeding device. Compared with the existing mechanical mixing method, the mixing strength, efficiency and uniformity are significantly improved.

[0016] 2) Solving the problem of metallurgical dust sticking to the wall during feeding: An innovative design was made for the electric furnace ash feeding device, which has a built-in "self-cleaning sidewall" function. One pair of vertical sidewalls uses a sidewall hydraulic cleaner to scrape off the mud adhering to the feeding funnel. The other pair of inclined sidewalls is cleverly designed with a small funnel structure that is attached to the feeding funnel (with a 5-10cm gap). The shaking caused by the impact of the metallurgical dust when it falls achieves the "self-cleaning sidewall" function. Attached Figure Description

[0017] Figure 1 This is a process flow diagram of the dry and wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge of the present invention.

[0018] Figure 2 This is a schematic diagram of the dry and wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge according to the present invention.

[0019] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0020] Figure 4 This is the front view of the metallurgical dust and sludge feeding device.

[0021] Figure 5 This is a side view of a metallurgical dust and sludge feeding device.

[0022] In the diagram, 1. Metallurgical dust and sludge feeding device (self-cleaning sidewall double spiral discharge device), 2. Electronic belt scale, 3. Ash silo, 4. Screw feeder scale, 5. Scraper conveyor, 6. Vertical strong mixer, 7. Online moisture monitoring device, 8. Belt conveyor; 101. Sidewall hydraulic cleaner, 102. Suspended baffle, 102a. Vertical rod, 102b. Small funnel structure, 103. Discharge double spiral structure, 104. Hydraulic and electrical control system, 105. Double spiral discharge device, 106. Feed hopper, 107. Support component. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Metallurgical electric furnace ash has high zinc and calcium oxide content. Before being fed into the rotary hearth furnace for zinc removal and disposal, it must undergo calcium oxide digestion pretreatment. Otherwise, the finished product will be severely pulverized, affecting the reduction effect of zinc removal in the rotary hearth furnace.

[0025] Principle: Quicklime, or calcium oxide (CaO), releases a large amount of heat when it reacts with water, forming a high-temperature alkaline solution. This process is called slaking or digestion.

[0026] The reaction equation is as follows:

[0027] CaO + H₂O → Ca(OH)₂ + heat

[0028] The process of mixing electric furnace ash and metallurgical dust involves mixing the electric furnace ash and metallurgical dust (moisture content ~32%) at a suitable moisture content, then storing and digesting them to allow the calcium oxide in the electric furnace ash to dissolve in advance, thus avoiding adverse effects on subsequent pelletizing.

[0029] This embodiment introduces a mechanical mixing method for dry and wet materials of electric furnace ash and metallurgical dust and sludge, which realizes the pretreatment of raw materials for digestion and passivation before batching in rotary hearth furnace, so as to mitigate the adverse effects of calcium oxide on rotary hearth furnace.

[0030] To fully consider the properties of the materials, a metallurgical dust and sludge feeding device 1 (or "self-cleaning sidewall double spiral discharge device") is installed at the dust and sludge feeding point. A vertical high-intensity mixer 6 is used for mixing and stirring, and dust removal and suppression facilities are provided. This ensures smooth and efficient mixing of dry and wet materials.

[0031] See Figure 2 A dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge includes a metallurgical dust and sludge feeding device 1, an electric furnace ash feeding device, and a vertical strong mixer 6.

[0032] Combination Figure 2-5 The metallurgical dust and sludge feeding device 1 includes a double-spiral discharge device 105, a feeding funnel 106, and a sidewall hydraulic cleaner 101. The feeding direction of the double-spiral discharge device 105 is horizontal, and its inlet is located at the top and is elongated. The feeding funnel 106 is a corresponding conical shape. The sidewall hydraulic cleaner 101 is attached to the two inner end faces of the feeding funnel 106 to scrape off the metallurgical dust and sludge attached to the two inner end faces of the feeding funnel 106. A support member 107 is fixedly installed on the support member 107, and a hanging baffle 102 is hung on the support member 107. The lower part of the hanging baffle 102 is a small funnel structure 102b that is attached to the feed funnel 106 in a similar shape, and the upper part is connected to multiple vertical rods 102a. The lower end of the vertical rods 102a is fixedly connected to the small funnel structure 102b, and the upper end is hung on the support member 107. The electric furnace ash feeding device is set vertically, and its lower end intersects with the double spiral discharge device 105 and is directly opposite the vertical strong mixer 6.

[0033] In this embodiment, see Figure 5The small funnel structure 102b is a rigid structure made of polymer material. It has a gap of 5-10cm between itself and the inner wall of the feed funnel 106. When metallurgical dust and sludge fall, they impact the small funnel structure 102b, causing it to shake.

[0034] See Figure 5 The sidewall hydraulic cleaner 101 has a power component and a scraper component. The power component is fixed on the support 107, and the scraper component is oriented downward and swings in a fan shape.

[0035] See Figure 2-3 The lower part of the metallurgical dust and sludge feeding device 1 is equipped with an electronic belt scale 2.

[0036] See Figure 2-3 The electric furnace ash feeding device includes, from top to bottom, an ash hopper 3, a screw feeder 4, and a scraper conveyor 5; the lower end of the scraper conveyor 5 is aligned with the feed inlet of the vertical strong mixer 6.

[0037] See Figure 2 A conveyor belt 8 is provided below the discharge port of the vertical strong mixer 6, and the conveyor belt 8 is equipped with a moisture prior monitoring device 7.

[0038] In this embodiment, the suspended baffle 102 is made of rubber, and multiple vertical rods 102a form a rubber curtain. The arrangement of the vertical rods 102a can be found in [reference needed]. Figure 5 ,but Figure 5 From the perspective of the viewpoint, a row of "rubber curtains" is not shown; in fact, the structure of the rubber curtains is... Figure 5 This can be seen from the side view perspective.

[0039] In this embodiment, the self-cleaning sidewall double spiral discharge device is 5m long × 3m wide × 3m high, with a volume of 23 m³ and a discharge speed of 20-60 t / h.

[0040] The feed hopper 106 is a steel bin.

[0041] The ash silo has an effective volume of approximately 100 m³. The top of the silo is equipped with a pneumatic ash conveying and receiving device, and the bottom of the silo is equipped with a feeding and weighing device.

[0042] The vertical high-power mixer 6 is an existing technology, but it is being used for the first time in the field of dry and wet mixing for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge. Its specific model and power size need to be selected reasonably.

[0043] After the materials are mixed in the vertical high-intensity mixer, the moisture content is monitored online to ensure that the moisture content of the materials meets the production requirements.

[0044] The material conveying drop point is equipped with a gas collection hood and dust removal facilities, and the storage area uses spray dust suppression.

[0045] In practice, electric furnace ash is mixed with metallurgical dust and sludge (32% moisture content), digested, and then processed on the rotary hearth furnace production line. Specifically, the electric furnace ash is transported by sealed suction tanker trucks and pneumatically conveyed to the electric furnace ash receiving silo. The metallurgical dust and sludge are transported by dump trucks to the sludge storage tank within the plant. The electric furnace ash is weighed by a spiral reducing scale at the bottom of the silo and then transferred to a vertical high-intensity mixer via a scraper conveyor. The metallurgical dust and sludge in the tank are fed by a grab crane to a self-cleaning sidewall double spiral discharge device, weighed by a belt scale at the bottom of the device, and then fed to the vertical high-intensity mixer. The metallurgical dust and sludge and the electric furnace ash are mixed in the vertical mixer, and the mixed material is transferred by belt conveyor to the mixing tank for disposal. The digested mixture is then loaded onto trucks by a grab crane and transported to the rotary hearth furnace feeding system. See the process flow diagram. Figure 1 .

[0046] This invention improves the efficiency and uniformity of mixing electric furnace ash and metallurgical dust and sludge:

[0047] A vertical high-intensity mixer was adopted as a powerful mixing device for metallurgical dust and electric furnace ash. The feed inlet was aligned with the lower end of the electric furnace ash feeding device and was laterally connected with the metallurgical dust feeding device. Compared with the existing mechanical mixing method, the mixing strength, efficiency and uniformity were significantly improved.

[0048] This invention solves the problem of metallurgical dust sticking to the wall during feeding:

[0049] An innovative design was made for the electric furnace ash feeding device, giving it a self-cleaning sidewall function. One pair of vertical sidewalls uses a hydraulic sidewall cleaner to scrape off the mud adhering to the feeding hopper. The other pair of inclined sidewalls are cleverly designed with a small funnel structure that is attached to the feeding hopper in shape (with a 5-10cm gap). The shaking caused by the impact when the metallurgical dust and mud fall achieves the self-cleaning sidewall function.

[0050] The above are preferred embodiments of the present invention. Those skilled in the art can also make adjustments or improvements to the system equipment configuration based on this. Without departing from the overall concept of the present invention, these modifications or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge, characterized in that: Including a metallurgical dust and sludge feeding device (1), an electric furnace ash feeding device, and a vertical strong mixer (6); The metallurgical dust and sludge feeding device (1) includes a double spiral discharge device (105), a feeding funnel (106), and a side wall hydraulic cleaner (101). The feeding direction of the double spiral discharge device (105) is horizontal, and its feed inlet is located at the top and is long and narrow. The feed funnel (106) is a corresponding cone shape. The two inner end faces of the feed funnel (106) are attached with a side wall hydraulic cleaner (101) for scraping off the metallurgical dust and mud attached to the two inner end faces of the feed funnel (106). A support member (107) is fixedly installed on the upper part of the feed funnel (106). A hanging baffle (102) is hung on the support member (107). The lower part of the hanging baffle (102) is a small funnel structure (102b) that is attached to the feed funnel (106) and the upper part is a plurality of vertical rods (102a). The lower end of the vertical rod (102a) is fixedly connected to the small funnel structure (102b), and the upper end is hung on the support member (107). The electric furnace ash feeding device is set vertically, with its lower end intersecting with the double spiral discharge device (105) and facing the vertical strong mixer (6).

2. The dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge as described in claim 1, characterized in that: The small funnel structure (102b) is a rigid structure made of polymer material. It has a gap of 5-10cm between itself and the inner wall of the feed funnel (106). When the metallurgical dust and sludge fall, it impacts the small funnel structure (102b), causing it to shake.

3. The dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge as described in claim 1, characterized in that: The sidewall hydraulic cleaner (101) has a power component and a scraper component. The power component is fixed on the support (107), and the scraper component is oriented downwards and swings in a fan shape.

4. The dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge as described in claim 1, characterized in that: The lower part of the metallurgical dust and sludge feeding device (1) is equipped with an electronic belt scale (2).

5. The dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge as described in claim 1, characterized in that: The electric furnace ash feeding device includes, from top to bottom, an ash hopper (3), a screw feeder (4), and a scraper conveyor (5); the lower end of the scraper conveyor (5) is aligned with the feed inlet of the vertical strong mixer (6).

6. The dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge as described in claim 1, characterized in that: A conveyor belt (8) is provided below the discharge port of the vertical strong mixer (6), and a moisture prior monitoring device (7) is provided on the conveyor belt (8).

7. The dry-wet mixing device for the comprehensive utilization of electric furnace ash and metallurgical dust and sludge as described in claim 1, characterized in that: The suspended baffle (102) is made of rubber, and multiple vertical rods (102a) form a rubber curtain.

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