Furnace bottom manufacturing device and use method for producing large crystal fused magnesia ore furnace

Abstract

The present invention provides a furnace bottom manufacturing device and a method for using a large crystal fused magnesia ore furnace. The device comprises a short round barrel outer wall, a central triangular area enclosure, a connecting rib plate and a lifting ring. The short round barrel outer wall is cylindrical. The central triangular area enclosure is suspended in the center area of ​​the furnace bottom manufacturing device, and its upper end is flush with the upper end of the short round barrel outer wall. The short round barrel outer wall and the central triangular area enclosure are fixedly connected by connecting rib plates, and a lifting ring is welded on the short round barrel outer wall. The furnace bottom manufacturing device makes the furnace bottom manufacturing simple and easy, reduces the labor intensity of workers, and avoids workers' high-altitude climbing and limited space operations, thereby avoiding infringement on workers' health and even personal safety.

Description

Technical Field

[0001] The invention relates to a large-crystal fused magnesia production device, in particular to a furnace bottom manufacturing device and a use method of a ore-fired furnace for producing large-crystal fused magnesia. Background Art

[0002] Large-crystal fused magnesia is typically produced by smelting light-burned magnesia powder in a submerged arc furnace. The furnace primarily consists of a trolley, furnace bottom rails, a furnace drum, electrodes, and a feeding device. The drum is typically a cylinder with a diameter of 1.3 to 2.0 meters and a height of 4 to 6 meters, welded from 5 to 8 mm thick steel sheets. During smelting, the drum is placed on the trolley on the furnace bottom rails, three electrodes are inserted into the drum, and the feeding device feeds the drum with light-burned magnesia powder.

[0003] In the production process, the first step is to make the furnace bottom. The traditional method is: first fill the trolley groove on the upper surface of the trolley with furnace charge, put a matching steel furnace drum on the position of the trolley groove, and add the charge into the furnace drum from the upper mouth of the furnace drum which is several meters high; then lower a ladder from the upper mouth of the furnace drum into the furnace drum, and the workers go down the ladder to the bottom of the furnace drum, manually spread the charge, and press it down with their feet.

[0004] The thickness of the furnace bottom material is measured from the surface of the trolley upwards. The typical thickness is 200-500mm. Finally, a layer of crushed electrodes is laid in the center of the furnace bottom for starting the furnace and striking the arc. These crushed electrodes can be brought to the bottom of the furnace drum by a worker entering the drum for the first time in a woven bag. Alternatively, after a worker has stepped firmly on the bottom, another worker can assist in dropping them from the top of the drum to the bottom, where they are then laid and positioned by a worker at the bottom. After completing these steps, the worker can then climb out of the drum using a ladder.

[0005] The disadvantages of the existing technology are: the furnace bottom production is inconvenient, the labor intensity is high, the workers work in a limited space during the construction process, the dust pollution is serious, which is harmful to the workers' health. In addition, the construction process requires workers to climb high, which seriously threatens the workers' personal safety. Summary of the Invention

[0006] The present invention provides a furnace bottom fabrication device and method for producing large-crystal fused magnesia ore arc furnaces. This device makes furnace bottom fabrication simple and safe, avoiding the high-altitude climbing and confined space operations involved in traditional methods, which can harm workers' health and even personal safety. The technical solution is as follows:

[0007] A furnace bottom manufacturing device for producing large-crystal electric-melted magnesia ore furnaces includes a short barrel outer wall, a central triangular area enclosure, a connecting rib plate and a lifting ring. The short barrel outer wall is cylindrical, and the central triangular area enclosure is suspended in the center area of ​​the furnace bottom manufacturing device, with its upper end flush with the upper end of the short barrel outer wall. The short barrel outer wall and the central triangular area enclosure are fixedly connected by a connecting rib plate, and a lifting ring is welded to the short barrel outer wall.

[0008] The diameter of the outer wall of the short round barrel is 20 to 100 mm smaller than the diameter of the smelting furnace, and the height is 200 to 500 mm; the height of the central triangular area enclosure is 50 to 150 mm.

[0009] The central triangular area enclosure includes three semi-cylindrical enclosures of the same shape and size evenly arranged on the same horizontal plane, and the centers of the three semi-cylindrical enclosures coincide with the centers of the ground projections of the three electrodes, and the three centers form an equilateral triangle.

[0010] Adjacent semi-cylindrical enclosures are fixedly connected by connecting enclosures, and the connecting enclosures are straight lines or recessed toward the center of an equilateral triangle.

[0011] The distance from the connecting fence to the center is greater than the distance from the side of the equilateral triangle corresponding to the connecting fence to the center.

[0012] The diameter of the semi-cylindrical enclosure is 50 to 150 mm smaller than the diameter of the electrode. The distance from the enclosure to the center must be 50 to 100 mm greater than the distance from the line connecting the ground projection centers of adjacent electrodes to the center.

[0013] The number of the connecting ribs is 3 or 6, and they are evenly arranged along the circumference of the outer wall of the short cylindrical barrel.

[0014] In the furnace bottom manufacturing device, the material of the short barrel outer wall, the central triangular area enclosure and the connecting rib plate is Q235 plate with a thickness of 6mm; the lifting ring is made of HBB335 steel bar.

[0015] The semi-cylindrical enclosure is designed to be semi-cylindrical, and the diameter of each semi-cylinder is 100 mm.

[0016] A method for using a furnace bottom manufacturing device for producing large-crystal fused magnesia ore furnace comprises the following steps:

[0017] S1: Place the furnace bottom making device in the trolley groove on the upper surface of the trolley platform;

[0018] S2: Fill the groove of the trolley and other parts of the furnace bottom manufacturing device except the central triangular area with furnace charge, and vibrate the periphery of the outer wall of the short barrel to make the furnace charge in the furnace bottom manufacturing device fully dense;

[0019] S3: Fill the central triangle enclosure with crushed electrodes;

[0020] S4: Put the smelting furnace drum of the submerged arc furnace outside the furnace bottom manufacturing device, adjust and stabilize the smelting furnace drum, and control the smelting furnace drum and the furnace bottom manufacturing device to be coaxial and centered;

[0021] S5: Use a crane or other lifting equipment to hook the lifting ring of the furnace bottom manufacturing device and pull the entire furnace bottom manufacturing device out from the inside of the smelting furnace;

[0022] S6: After the furnace bottom making device is pulled out, the corresponding peripheral area of ​​the bottom outside the smelting furnace drum is manually hammered to make the charge inside the smelting furnace drum fully dense.

[0023] The furnace bottom manufacturing device and use method of the large-crystal fused magnesia ore arc furnace provided by the present invention make the furnace bottom manufacturing simple and easy, reduce the labor intensity of workers, and avoid workers' high-altitude climbing and confined space operations, thereby avoiding infringement on workers' health and even personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing the state of use of the furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace;

[0025] Figure 2 It is a structural schematic diagram of the furnace bottom manufacturing device for producing large crystal fused magnesia ore arc furnace;

[0026] Figure 3 is a plan view of the enclosure of the central triangular area;

[0027] Figure 4 This is a schematic diagram of the use of the furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace;

[0028] The numbers in the figure are as follows:

[0029] 1- smelting furnace drum; 2- furnace bottom manufacturing device; 3- trolley groove; 4- trolley platform; 5- trolley wheel; 21- outer wall of short barrel; 22- central triangle area enclosure; 23- connecting rib plate; 24- lifting ring; 31- semi-cylindrical enclosure; 32- connecting enclosure; 41- ground projection position of electrode; 42- electrode center line; 43- center. DETAILED DESCRIPTION

[0030] like Figure 1As shown, the furnace bottom making device for producing large-crystal fused magnesia ore arc furnace provided by the present invention is to place the furnace bottom making device 2 in the trolley groove 3 on the upper surface of the trolley platform 4, fill the furnace bottom making device 2 with furnace charge and tamp it, then place broken electrodes on the central part of the upper surface of the furnace charge, and then put the smelting furnace drum 1 on the outer cover of the furnace bottom making device 2. After the smelting furnace drum 1 is adjusted to an upright state and firmly seated in the trolley groove 3, the furnace bottom making device 2 is lifted and taken out from the upper opening of the smelting furnace drum 1 to complete the furnace bottom making.

[0031] like Figure 2 As shown, the furnace bottom manufacturing device includes a short barrel outer wall 21, a central triangular area enclosure 22, a connecting rib plate 23 and a lifting ring 24. The short barrel outer wall 21, the central triangular area enclosure 22 and the connecting rib plate 23 are made of steel plates, and the lifting ring 24 is made of steel bars.

[0032] The outer wall 21 of the short barrel is cylindrical, and its diameter is slightly smaller than the diameter of the smelting furnace drum 1, and can be 20 to 100 mm smaller than the diameter of the smelting furnace drum 1; the height is the thickness of the traditional furnace bottom, which is 200 to 500 mm.

[0033] The central triangular area enclosure 22 is suspended in the central area of ​​the furnace bottom manufacturing device 2, and its upper end is flush with the upper end of the short barrel outer wall 21, with a height of 50 to 150 mm.

[0034] Combine Figure 3 As shown, the central triangular enclosure 22 includes three semi-cylindrical enclosures 31 of the same shape and size, evenly arranged on the same horizontal plane. The centers of the three semi-cylindrical enclosures form an equilateral triangle, and the center of the equilateral triangle is also the center 43 of the central triangular enclosure 22. The semi-cylindrical enclosures 31 are formed by bending a steel plate into a semicircle, and the diameters of the endpoints of the semicircle are parallel to the line connecting the centers of the other two semi-cylindrical enclosures on the same horizontal plane.

[0035] Adjacent semi-cylindrical enclosures 31 are fixedly connected by connecting enclosures 32. The connecting enclosures 32 are provided in three pieces, and the three connecting enclosures 32 are of the same shape and size. One semi-circular end of the first semi-cylindrical enclosure is fixedly connected to one semi-circular end of the second semi-cylindrical enclosure via the first connecting enclosure, the other semi-circular end of the first semi-cylindrical enclosure is fixedly connected to one semi-circular end of the third semi-cylindrical enclosure via the second connecting enclosure, and the other semi-circular end of the second semi-cylindrical enclosure is fixedly connected to the other semi-circular end of the third semi-cylindrical enclosure via the third connecting enclosure.

[0036] The connecting enclosure 32 may be recessed toward the center 43, but the recessed portion cannot enter the range of the equilateral triangle, so that the recessed portion does not overlap with the range of the equilateral triangle. In this case, the distance from a connecting enclosure 32 to the center 43 must be greater than the distance from the side of the equilateral triangle where the connecting enclosure 32 is located to the center 43.

[0037] The three semi-cylindrical enclosures 31 correspond to the electrode ground projection positions 41 of the three electrodes of the electric arc furnace, that is, the centers of the three semi-cylindrical enclosures and the centers of the three electrode ground projections coincide with each other, and the diameter of the semi-cylindrical enclosures can be 50 to 150 mm smaller than the electrode diameter. In this way, the centers of the electrode ground projection positions 41 of the three electrodes form the above-mentioned equilateral triangle, and the line 42 connecting the centers of the ground projections of adjacent electrodes is also one of the sides of the equilateral triangle. The distance from the enclosure to the center must be greater than the distance from the corresponding ground projection center line 42 to the center 43, which is 50 to 100 mm. This size design can save the amount of broken electrodes.

[0038] Back to Figure 2 The outer wall 21 of the short cylinder and the central triangular area enclosure 22 are fixedly connected by connecting ribs 23. The number of the connecting ribs 23 is 3 or 6, and the connecting ribs 23 are evenly arranged.

[0039] Lifting rings 24 are welded to the upper end of the outer wall 21 of the short drum in a symmetrical distribution on the left and right sides. The lifting rings 24 serve as the points of application of pulling force during later dismantling.

[0040] The steps for making the furnace bottom are as follows:

[0041] S1: Place the furnace bottom making device 2 on the trolley groove 3 on the upper surface of the trolley platform 4 so that the furnace bottom making device 2 basically covers the trolley groove 3;

[0042] S2: Fill the trolley groove and other parts of the furnace bottom making device 2 except the central triangular area enclosure 22 with furnace charge, and vibrate the periphery of the short barrel outer wall 21 to fully compact the furnace charge in the furnace bottom making device 2;

[0043] S3: Fill the central triangular area enclosure 22 with crushed electrodes;

[0044] S4: Put the smelting furnace drum 1 on the outside of the furnace bottom manufacturing device 2, adjust and seat the smelting furnace drum 1, and control the smelting furnace drum 1 and the furnace bottom manufacturing device 2 to be coaxial and centered;

[0045] S5: Use a crane or other lifting equipment to hook the lifting ring 24 of the furnace bottom manufacturing device 2 and pull the entire furnace bottom manufacturing device 2 out from the inside of the smelting furnace tube 1.

[0046] After the furnace bottom making device 2 is pulled out, the periphery of the furnace bottom material constrained by it will collapse naturally and fill the gap reserved between the furnace bottom making device 2 and the smelting furnace barrel 1. Considering that the gap filled by the natural collapse of the furnace bottom material may not be dense enough, the corresponding parts outside the smelting furnace barrel 1 can be manually knocked and vibrated to make the furnace charge inside the furnace barrel fully dense.

[0047] Example:

[0048] In this embodiment, the diameter of the smelting furnace tube 1 of the ore arc furnace is 1500 mm, the diameter of the electrode is 300 mm, the outer wall diameter of the furnace bottom manufacturing device 2 is 1450 mm, the outer wall height is 500 mm, and the height of the central triangular area enclosure 22 is 100 mm.

[0049] The central triangular area enclosure 22 is located in the central area of ​​the furnace bottom making device 2 and is in a suspended state. The upper surface of the central triangular area enclosure 22 is flush with the upper surface of the short barrel outer wall 21. The three corners of the central triangular area enclosure 22 are evenly arranged as semi-cylindrical enclosures 31. The semi-cylindrical enclosures 31 are designed to be semi-cylindrical, and the diameter of each semi-cylinder is 100 mm. The connecting enclosures 22 outside the three semi-cylindrical enclosures 31 are recessed inward.

[0050] The steel plates used to make the furnace bottom manufacturing device 2 are all Q235 plates with a thickness of 6 mm. There are 6 connecting ribs 23 used to connect the outer wall 21 of the short barrel and the electrode triangle area enclosure 22, which are evenly distributed along the circumference of the outer wall 21 of the short barrel. The lifting ring 24 is welded to the outer wall 21 of the short barrel with HBB335 steel bars.

[0051] When the furnace bottom making device 2 provided in this embodiment makes a furnace bottom, as shown in FIG. Figure 4 As shown, the furnace bottom making device 2 is placed in the center of the trolley platform 4, and the furnace bottom making device 2 basically covers the trolley groove 3, and then the trolley groove and other parts of the furnace bottom making device 2 except the central triangular area enclosure 22 are filled with furnace charge, and the periphery of the outer wall 21 of the short barrel is vibrated 200 times so that the furnace charge in the furnace bottom making device 2 is fully dense, and then the central triangular area enclosure 22 is filled with crushed electrodes with a particle size of 20 to 50 mm.

[0052] After the filling work is completed, the smelting furnace drum 1 of the ore-heating furnace is placed on the outside of the furnace bottom making device 2, and the smelting furnace drum 1 is adjusted and firmly seated, and the smelting furnace drum 1 and the furnace bottom making device 2 are controlled to be coaxial and centered. Then, the lifting ring 24 of the furnace bottom making device 2 is hooked with an overhead crane, and the entire furnace bottom making device 2 is pulled out from the inside of the smelting furnace drum 1.

[0053] After the furnace bottom making device 2 is pulled out, the corresponding circumferential area of ​​the bottom outside the smelting furnace tube 1 is manually knocked 200 times to make the charge inside the smelting furnace tube 1 fully dense.

[0054] The furnace bottom manufacturing device and use method for producing large-crystal fused magnesia ore arc furnace provided by the present invention make the furnace bottom manufacturing simple and feasible, reduce the labor intensity of workers, and avoid workers' high-altitude climbing and confined space operations, thereby avoiding infringement on workers' health and even personal safety.

Claims

1. A furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace, characterized in that: It includes a short barrel outer wall, a central triangular area enclosure, a connecting rib plate and a lifting ring. The short barrel outer wall is cylindrical. The central triangular area enclosure is suspended in the central area of ​​the furnace bottom manufacturing device, and its upper end is flush with the upper end of the short barrel outer wall. The short barrel outer wall and the central triangular area enclosure are fixedly connected by connecting rib plates, and a lifting ring is welded on the short barrel outer wall; the central triangular area enclosure includes three semi-cylindrical enclosures of the same shape and size evenly arranged on the same horizontal plane, and the centers of the three semi-cylindrical enclosures and the centers of the ground projections of the three electrodes respectively coincide with each other, and the three centers form an equilateral triangle.

2. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 1 is characterized in that: The diameter of the outer wall of the short round barrel is 20~100mm smaller than the diameter of the smelting furnace tube, and the height is 200~500mm; the height of the central triangular area enclosure is 50~150mm.

3. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 1 is characterized in that: Adjacent semi-cylindrical enclosures are fixedly connected by connecting enclosures, and the connecting enclosures are straight lines or recessed toward the center of an equilateral triangle.

4. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 3 is characterized in that: The distance from the connecting enclosure to the center is greater than the distance from the side of the equilateral triangle corresponding to the connecting enclosure to the center.

5. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 1 is characterized in that: The diameter of the semi-cylindrical enclosure is 50~150mm smaller than the electrode diameter; the distance from the connecting enclosure to the center must be 50~100mm greater than the distance from the connecting line of the ground projection centers of adjacent electrodes to the center.

6. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 1 is characterized in that: The number of the connecting ribs is 3 or 6, and they are evenly arranged along the circumference of the outer wall of the short round barrel.

7. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 1 is characterized in that: In the furnace bottom manufacturing device, the material of the short barrel outer wall, the central triangular area enclosure and the connecting rib plate is Q235 plate with a thickness of 6 mm; the lifting ring is made of HBB335 steel bar.

8. The furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to claim 1 is characterized in that: The semi-cylindrical enclosure is designed to be semi-cylindrical, and the diameter of each semi-cylinder is 100 mm.

9. The method for using the furnace bottom manufacturing device for producing large crystal fused magnesia ore furnace according to any one of claims 1 to 8 comprises the following steps: S1: placing the furnace bottom making device in the trolley groove on the upper surface of the trolley platform; S2: Fill the groove of the trolley and other parts of the furnace bottom manufacturing device except the central triangular area enclosure with furnace charge, and vibrate the periphery of the outer wall of the short round barrel so that the furnace charge in the furnace bottom manufacturing device is fully compacted; S3: Fill the central triangle enclosure with crushed electrodes; S4: Put the smelting furnace drum of the ore-fired furnace outside the furnace bottom manufacturing device, adjust and stabilize the smelting furnace drum, and control the smelting furnace drum and the furnace bottom manufacturing device to be coaxial and centered; S5: Use a crane or other lifting equipment to hook the lifting ring of the furnace bottom manufacturing device and pull the entire furnace bottom manufacturing device out from the inside of the smelting furnace; S6: After the furnace bottom making device is pulled out, the corresponding peripheral area of ​​the bottom outside the smelting furnace drum is manually knocked so that the charge inside the smelting furnace drum is fully compacted.

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