A method for building a fuming furnace

Abstract

The present invention develops a method for building a fuming furnace. By setting the refractory brick layer as the bottom refractory brick layer and the top refractory brick layer, and laying the top refractory brick layer with snap-in refractory bricks, the tightness of the combination of refractory bricks can be effectively improved. When a water leakage accident occurs inside the fuming furnace or slag runs out through the furnace seam and needs to be condensed with water, the erosion of water on the refractory brick layer can be effectively reduced, which has a significant effect on improving the service life of the fuming furnace and can reach 4,500 to 5,000 furnaces.

Description

Technical Field

[0001] The present invention relates to the technical field of pyro-metallurgical lead fuming furnaces, and specifically to a method for building a fuming furnace Background Art

[0002] A fuming furnace is a device that blows a mixture of air and pulverized coal into liquid slag, causing some valuable metals in the slag to volatilize in the form of metals, oxides or sulfides. As Figure 1 shown in the figure, in the prior art, the fuming furnace includes a furnace body 1 and a bottom water jacket 2. A primary air pulverized coal nozzle 3 and a secondary air nozzle 4 are provided on both sides of the fuming furnace. A slag feed pipe 5 is provided in the upper middle part of the furnace body 1. A tertiary air tuyere 6 is provided at a position above the slag feed pipe 5 in the furnace body 1. A molten slag discharge port 7 is provided at the lower part of the furnace body 1. The furnace body 1 is also provided with a flue gas outlet 8.

[0003] When the above-mentioned fuming furnace works, Kivcet slag is added through the slag feed pipe. The primary air pulverized coal nozzle blows in pulverized coal and combustion air. The secondary air nozzle mainly blows in combustion air for combustion support, and at the same time forms a molten pool at 1150°C - 1300°C inside the fuming furnace, reducing lead and zinc oxides in the Kivcet slag to lead and zinc vapors. After the metal vapors enter the upper space of the fuming furnace, they are oxidized into zinc oxide and lead oxide by the air supplemented by the tertiary air tuyere, and then enter the waste heat boiler for cooling and trapping through the flue gas outlet. The remaining molten slag is discharged through the molten slag discharge port.

[0004] In the prior art, the method for building a fuming furnace is to first lay a layer of bottom casting material layer 9 on the bottom water jacket, then lay a layer of refractory brick layer 10, and finally lay a layer of casting material protection layer 11 above the refractory brick layer 10. The function of the casting material protection layer is to reduce the erosion of the refractory brick layer when high-temperature liquid Kivcet slag is added.

[0005] However, the fuming furnace built by the above-mentioned furnace building method has defects in use: in the refractory brick layer, the tightness of the combination of refractory bricks is limited. When a water leakage accident occurs inside the fuming furnace or slag runs out of the furnace seam and needs to be condensed with water, part of the water will erode the refractory brick layer, resulting in the pulverization of the refractory bricks and shortening the service life of the fuming furnace. The number of furnace uses is generally 2000 - 2500 furnaces. Summary of the Invention

[0006] The present invention has developed a method for building a fuming furnace. By setting the refractory brick layer as a bottom refractory brick layer and a top refractory brick layer, and laying the top refractory brick layer with snap-in refractory bricks, the tightness of the combination of refractory bricks can be effectively improved. When a water leakage accident occurs inside the fuming furnace or slag runs out of the furnace seam and needs to be condensed with water, the erosion of the refractory brick layer by water can be effectively reduced, which has a significant effect on improving the service life of the fuming furnace and can reach 4500 - 5000 furnaces.

[0007] A method for building a fuming furnace, the method for building the fuming furnace comprising the following specific steps:

[0008] (1) Laying the bottom castable layer 9:

[0009] Lay a layer of castable on the bottom water jacket 2 of the fuming furnace, discharge the air bubbles in the castable through a vibrating rod, tamp it flat with a scraper, and then heat it to 200 °C and bake it for 24 h to obtain the bottom castable layer 9;

[0010] (2) Laying the bottom refractory brick layer 12:

[0011] Lay a layer of cuboid refractory bricks on the surface of the bottom castable layer 9 in a dry-laying manner. Place a piece of kraft paper at the joint of the refractory bricks every 5 refractory bricks. After laying, the bottom refractory brick layer 12 is obtained;

[0012] (3) Laying the top refractory brick layer 13:

[0013] Lay a layer of snap-in refractory bricks on the upper surface of the bottom refractory brick layer 12 in a dry-laying manner. Place a piece of kraft paper at the joint of the refractory bricks every 3 refractory bricks. After laying, the top refractory brick layer 13 is obtained;

[0014] (4) Laying the castable protective layer 11:

[0015] Lay a layer of castable on the upper surface of the top refractory brick layer 13, discharge the air bubbles in the castable through a vibrating rod, and tamp it flat with a scraper to obtain the castable protective layer 11;

[0016] (5) Baking the fuming furnace:

[0017] Slowly heat the fuming furnace to 800 °C, and the baking time is 7 days.

[0018] Further, the castable described in step (1) and step (4) is made of chrome corundum, and the thickness of the castable is preferably 50 mm.

[0019] Further, the cuboid refractory brick described in step (2) is a magnesia-chrome refractory brick.

[0020] Further, the thickness of the kraft paper described in step (2) is 2 mm.

[0021] Further, the snap-in refractory brick described in step (3) is an alumina-chrome refractory brick.

[0022] Further, the structure of the snap-in refractory brick described in step (3) includes a brick body 14, and a protruding portion 15 is provided on the brick body 14, and a recessed portion 16 is provided at a position corresponding to the protruding portion 15.

[0023] Further, there are 2 groups of protruding portions 15 and recessed portions 16 provided on the brick body 14.

[0024] Furthermore, the radius R2 of the recessed portion 16 is ≥ the radius R1 of the protruding portion 15.

[0025] Furthermore, the thickness of the strawboard in step (3) is R2 - R1.

[0026] Furthermore, the radius R1 of the protruding portion 15 is preferably 12 mm, and the radius R2 of the recessed portion 16 is preferably 14 mm.

[0027] Advantages of the present invention:

[0028] 1. By setting the refractory brick layer into a bottom refractory brick layer and a top refractory brick layer, and laying the top refractory brick layer with snap-in refractory bricks, the present invention can effectively improve the tightness of the combination of refractory bricks. When a water leakage accident occurs inside the fuming furnace or slag runs out through the furnace seam and needs to be condensed with water, it can effectively reduce the erosion of water on the refractory brick layer, and has a significant effect on improving the service life of the fuming furnace, which can reach 4,500 - 5,000 furnaces.

[0029] 2. The furnace building method of the present invention has simple furnace building operations. Adopting a sandwich-type masonry method, the top castable protective layer can effectively prevent the refractory brick layer below it from being directly scoured by high-temperature liquid Kivcet slag; while the refractory brick layer adopts an upper and lower two-layer structure, and the top refractory brick layer uses an aluminum-chromium material with good water resistance, which can protect the refractory brick layer from being eroded by water. At the same time, the top refractory brick layer is a snap structure, and each brick can be tightly combined, effectively preventing the melt from leaking from the brick joints; the bottom refractory brick layer is made of magnesia-chrome material with good thermal stability but easy to be eroded by water, making the top refractory brick layer and the bottom refractory brick layer form complementary advantages. This kind of furnace building method can effectively extend the service life of the fuming furnace and the furnace building cycle of the fuming furnace. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the overall fuming furnace in the prior art;

[0031] Figure 2 It is a schematic diagram of the furnace building method of the fuming furnace of the present invention;

[0032] Figure 3 It is a schematic diagram of the snap-in refractory brick of the present invention;

[0033] In the figure, 1 - furnace body, 2 - furnace bottom water jacket, 3 - primary air pulverized coal nozzle, 4 - secondary air nozzle, 5 - slag feed pipe, 6 - tertiary air tuyere, 7 - molten slag discharge port, 8 - flue gas outlet, 9 - furnace bottom castable layer, 10 - refractory brick layer, 11 - castable protective layer, 12 - bottom refractory brick layer, 13 - top refractory brick layer, 14 - brick body, 15 - protruding portion, 16 - recessed portion Detailed Embodiments

[0034] Example 1

[0035] A method for building a fuming furnace, the method for building the fuming furnace comprising the following specific steps:

[0036] (1) Laying the bottom castable layer 9:

[0037] Lay a layer of castable on the bottom water jacket 2 of the fuming furnace, discharge the air bubbles in the castable through a vibrating rod, tamp it flat with a scraper, and then heat it to 200 °C and bake it for 24 h to obtain the bottom castable layer 9;

[0038] (2) Laying the bottom refractory brick layer 12:

[0039] Lay a layer of cuboid refractory bricks flat on the surface of the bottom castable layer 9 in a dry-laying manner. Every 5 refractory bricks, place a piece of manila paper with a thickness of 2 mm at the joint of the refractory bricks. After completion of the laying, obtain the bottom refractory brick layer 12;

[0040] The cuboid refractory brick is a magnesia-chrome refractory brick;

[0041] (3) Laying the top refractory brick layer 13:

[0042] Lay a layer of snap-in refractory bricks on the upper surface of the bottom refractory brick layer 12 in a dry-laying manner. Every 3 refractory bricks, place a piece of manila paper at the joint of the refractory bricks. After completion of the laying, obtain the top refractory brick layer 13;

[0043] The snap-in refractory brick is an alumina-chrome refractory brick, and its structure includes a brick body 14. There are 2 protruding parts 15 on the brick body 14, and 2 recessed parts 16 are provided at positions corresponding to the 2 protruding parts 15; the radius R1 of the protruding part 15 is 12 mm, the radius R2 of the recessed part 16 is 14 mm, and the thickness of the manila paper is 2 mm;

[0044] (4) Laying the castable protective layer 11:

[0045] Lay a layer of castable on the upper surface of the top refractory brick layer 13, discharge the air bubbles in the castable through a vibrating rod, and tamp it flat with a scraper to obtain the castable protective layer 11;

[0046] (5) Baking the fuming furnace:

[0047] Slowly heat the fuming furnace to 800 °C, and the baking time is 7 days.

[0048] The castable described in step (1) and step (4) is made of chrome corundum, and the thickness of the castable is 50 mm.

[0049] Compared with the method of building a furnace with a single layer of refractory bricks in the prior art, the service life of the fuming furnace is extended from 2,000 to 2,500 furnaces to 4,500 to 5,000 furnaces, reducing the furnace building frequency of the fuming furnace, improving the working efficiency of the fuming furnace, and saving a large amount of materials for furnace building at the same time.

[0050] Finally, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for building a smoke converting furnace, characterized in that: The method for building the fuming furnace includes the following specific steps: (1) Laying the bottom casting layer: Lay a layer of casting material on the water jacket at the bottom of the fuming furnace, discharge the air bubbles in the casting material through a vibrating rod, tamp it flat with a scraper, then heat it to 200 °C and bake it for 24 hours to obtain the bottom casting layer; (2) Laying the bottom refractory brick layer: Lay a layer of cuboid refractory bricks on the surface of the bottom casting layer in a dry-laying manner. Place a piece of manila paper at the joint of the refractory bricks every 5 refractory bricks. After completion of laying, the bottom refractory brick layer is obtained; (3) Laying the top refractory brick layer: Lay a layer of snap-in refractory bricks on the upper surface of the bottom refractory brick layer in a dry-laying manner. Place a piece of manila paper at the joint of the refractory bricks every 3 refractory bricks. After completion of laying, the top refractory brick layer is obtained; (4) Laying the casting protection layer: Lay a layer of casting material on the upper surface of the top refractory brick layer, discharge the air bubbles in the casting material through a vibrating rod, and tamp it flat with a scraper to obtain the casting protection layer; (5) Baking the fuming furnace: Slowly heat the fuming furnace to 800 °C, and the baking time is 7 days; The casting material described in step (1) and step (4) is made of chrome corundum, and the thickness of the casting material is 50 mm; the cuboid refractory brick described in step (2) is a magnesia-chrome refractory brick; the snap-in refractory brick described in step (3) is an alumina-chrome refractory brick; the structure of the snap-in refractory brick described in step (3) includes a brick body, and a protruding part is provided on the brick body, and a recessed part is provided at a position corresponding to the protruding part.

2. The method for building a fuming furnace according to claim 1, characterized in that: The thickness of the manila paper described in step (2) is 2 mm.

3. The method for building a fuming furnace according to claim 1, characterized in that: There are 2 groups of protruding parts and recessed parts provided on the brick body.

4. The method for building a fuming furnace according to claim 1 or 3, characterized in that: The radius R2 of the recessed part is ≥ the radius R1 of the protruding part.

5. The method for building a fuming furnace according to claim 4, wherein: The thickness of the manila paper described in step (3) is R2 - R1.

6. The method for building a fuming furnace according to claim 4, wherein: The radius R1 of the protruding part is 12 mm, and the radius R2 of the recessed part is 14 mm.

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