CN115875978A - Lime combined crucible with weight of more than 200kg and preparation method - Google Patents
Lime combined crucible with weight of more than 200kg and preparation method Download PDFInfo
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- CN115875978A CN115875978A CN202211628823.XA CN202211628823A CN115875978A CN 115875978 A CN115875978 A CN 115875978A CN 202211628823 A CN202211628823 A CN 202211628823A CN 115875978 A CN115875978 A CN 115875978A
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Abstract
The invention relates to a lime combined crucible with the weight of more than 200kg, which comprises a crucible bottom and a crucible body, wherein the crucible bottom is of an integral crucible bottom or a splicing structure, the crucible body is of a splicing structure, the top of the crucible bottom is connected with the bottom of the crucible body in an embedded mode through an arc surface, the crucible body is formed by building pot body building blocks in a layered mode, the crucible body building blocks between layers and the crucible body building blocks in each layer are connected in an embedded mode through the arc surfaces, and the crucible body building blocks in two adjacent layers are arranged in a staggered joint mode. A certain gap exists between each part of the combined crucible, so that the thermal stress generated by the crucible in the process of baking and using can be released; preventing the generation of cracks. Solves the problem that the large crucible generates cracks in the baking furnace and the using process.
Description
Technical Field
The invention relates to a crucible, in particular to a lime combined crucible with the weight of more than 200 kg.
Background
The crucible forming generally adopts ramming materials and isostatic pressing crucibles, and because the ramming materials adopt manual ramming, the efficiency is lower, the oven drying time is longer, and the strength and the density of the crucibles are not high. The isostatic pressing crucible improves some defects of ramming materials, but the isostatic pressing formed lime crucible is easy to crack in the using process. And the isostatic pressing equipment cannot manufacture large crucibles due to the limitation of the diameter thereof.
At present, the domestic crucible with the weight of less than 200kg generally takes isostatic pressing as the main part, the production is relatively easy when the model and the specification are small, and the isostatic pressing with the diameter of less than 320mm can be basically formed; an isostatic press with the diameter of 500mm or more is needed for more than 200kg (including), the lime isostatic crucible is different from isostatic crucibles made of other materials, any bonding agent is not suitable in the forming process, and demoulding and carrying are difficult for large lime isostatic crucibles.
Disclosure of Invention
The invention aims to solve the technical problem of providing a calcareous combined crucible with the weight of more than 200kg, solving the problem of cracks generated in the use process of an isostatic pressing crucible and the inadaptability of the isostatic pressing crucible to a large-sized crucible.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a lime matter combination crucible more than 200kg, includes at the bottom of the crucible, the crucible body, at the bottom of the crucible be whole crucible end or mosaic structure, the crucible body is mosaic structure, and the bottom of crucible end top and the crucible body adopts the arc surface to inlay to be connected, and the crucible body is built by pot body building block layering and forms, is the arc surface between the crucible body building block between layer and the every intraformational crucible body building block and inlays the connection, and adjacent two-layer crucible body building block is the fissure of displacement arrangement.
When being mosaic structure at the bottom of the crucible, the building block at the bottom of including a plurality of crucibles at the bottom of the crucible, building block at the bottom of the crucible include end core, and a plurality of end lamella of end core periphery equipartition, the periphery of end core are equipped with the ladder platform, and end lamella inlays through ladder platform and end core and is connected.
The lime crucible of over 200kg consists of natural lime 93-98 wt%, sodium tripolyphosphate 0.5-2 wt%, sodium hexametaphosphate 0.5-2 wt%, calcium fluoride 0.5-3 wt% and silica powder 0.01-2 wt%.
The natural lime contains CaO more than 90% and SiO 2 Less than 0.5%.
A method for manufacturing a lime combined crucible with the weight of more than 200kg comprises the following steps:
firstly, preparing clinker
1) Pulverizing natural lime to below 0.5 mm;
2) Adding sodium polyphosphate, sodium hexametaphosphate, calcium fluoride and silicon micropowder into natural lime, uniformly mixing, and then making blocks;
3) And (3) calcining: sintering the mixture into clinker at 1350-1500 ℃;
4) Crushing the clinker to 0-5 mm;
secondly, preparing an integral crucible bottom or crucible bottom building block and a crucible body building block
1) Heating clinker at 110-150 deg.c, adding paraffin wax in 1.0-2.5 wt% of the clinker, mixing, making integral crucible bottom or building block and blank block of crucible body separately in combined crucible structure, and numbering;
2) Sintering at 1350-1500 ℃;
thirdly, assembling:
when the crucible bottom block is used, the whole crucible bottom or the assembled crucible bottom block is placed at the bottom of a smelting furnace, the pot body blocks are built layer by layer according to the serial numbers to form a crucible, and magnesia is tamped at the periphery of the crucible.
The weight gain rate of the clinker is less than 1 percent after the clinker is placed in the air for 30 days.
And step two, 1) the blank blocks of the integral crucible bottom or the crucible bottom building block and the crucible body building block are formed by adopting a hydraulic brick press or a friction brick press.
Compared with the prior art, the invention has the beneficial effects that:
1. the sodium tripolyphosphate, the sodium hexametaphosphate, the calcium fluoride and the silicon micropowder are used as additives, so that the hydration of the material is delayed, and the influence on the high-temperature performance of the material is small.
2. A certain gap exists between each part of the combined crucible, so that the thermal stress generated by the crucible in the baking furnace and the using process can be released; preventing the generation of cracks. Solves the problem that the large crucible generates cracks in the baking furnace and the using process.
3. The sintering temperature is low, and the sintering can be carried out at 1350-1500 ℃, so that the low-temperature sintering and high-temperature use are realized.
4. Can effectively remove inclusions in steel or alloy and improve the purity of the material.
Drawings
FIG. 1 is a sectional view of the first embodiment.
Fig. 2 is a top view of the first embodiment.
FIG. 3 is a schematic view of a body block.
FIG. 4 is a bottom sectional view of the second embodiment.
FIG. 5 is a schematic view of the bottom of the second embodiment.
In the figure: the crucible comprises an integral crucible bottom 1, a crucible bottom edge 2, a pot body building block 3, a bottom core 4 and a bottom flap 5.
Detailed Description
The following further illustrates embodiments of the invention in conjunction with the drawings:
like at the bottom of fig. 1-fig. 5, a lime combination crucible more than 200kg, including the crucible end, the crucible body, at the bottom of the crucible for whole crucible end 1 or mosaic structure, the crucible body is mosaic structure, at the bottom of the crucible top and the bottom of the crucible body adopt the arc surface to inlay to be connected, the crucible body is built by 3 layering masonry pot body building blocks, be the arc surface between the crucible body building block 3 between layer and the layer and every intraformational crucible body building block 3 and inlay the connection, adjacent two-layer crucible body building block 3 is the fissure of displacement.
When being mosaic structure at the bottom of the crucible, the building block at the bottom of the crucible includes a plurality of crucible, and the building block at the bottom of the crucible includes end core 4, and a plurality of end lamella 5 of end core periphery equipartition, the periphery of end core 4 are equipped with the ladder platform, and end lamella 5 inlays through ladder platform and end core 4 and is connected.
A method for manufacturing a lime combined crucible with the weight of more than 200kg comprises the following steps:
firstly, preparing clinker
1) Pulverizing natural lime to below 0.5 mm;
2) Adding sodium polyphosphate, sodium hexametaphosphate, calcium fluoride and silicon micropowder into natural lime, uniformly mixing, and then making blocks; comprises 93 percent of natural lime, 0.5 to 2 percent of sodium tripolyphosphate, 0.5 to 2 percent of sodium hexametaphosphate, 0.5 to 3 percent of calcium fluoride and 0.05 to 2 percent of silicon micropowder according to weight percentage;
3) And (3) calcining: sintering the mixture into clinker at 1350-1500 ℃;
4) Crushing the cooked material to 0-5 mm;
secondly, preparing an integral crucible bottom or crucible bottom building block and a crucible body building block
1) Heating clinker at 110-150 deg.c, adding paraffin wax in 1.0-2.5 wt% of the clinker, mixing, making integral crucible bottom or building block and blank block of crucible body separately in combined crucible structure, and numbering;
2) Sintering at 1350-1500 ℃;
thirdly, assembling:
when the crucible is used, the whole crucible bottom or the assembled crucible bottom building blocks are placed at the bottom of a heating furnace, the pot body building blocks are built layer by layer according to the serial numbers to form a crucible, and magnesia is tamped on the periphery of the crucible; adding smelting materials into the crucible for smelting.
The weight gain rate of the clinker is less than 1 percent after the clinker is placed in the air for 30 days.
And step two, 1) the blank blocks of the integral crucible bottom or the crucible bottom building block and the crucible body building block are formed by adopting a hydraulic brick press or a friction brick press.
Example one
The crucible weighed 220Kg (capacity 220Kg crucible), and the diameter of the bottom of the crucible was 320mm.
Lime matter combination crucible, including the crucible end, the crucible body, the crucible end is 1 at the bottom of whole crucible, and the crucible body is mosaic structure, and the bottom of crucible end top and the crucible body adopts the arc surface to inlay to be connected, and the crucible body is built by 3 layering of pot body building block and is built by laying bricks or stones and form, is the arc surface between layer and the layer crucible body building block 3 and every intraformational crucible body building block 3 and inlays the connection, and adjacent two-layer crucible body building block 3 arranges for the fissure of displacement. The upper and lower parts of the crucible keep 1-3% of taper.
The manufacturing method of the calcareous combined crucible comprises the following steps:
firstly, preparing clinker
1) Pulverizing natural lime to below 0.5 mm;
2) Adding sodium polyphosphate, sodium hexametaphosphate, calcium fluoride and silicon micropowder into natural lime, uniformly mixing, and then making blocks; according to the weight percentage, the natural lime is 95 percent, caO in the natural lime is more than 90 percent, and SiO 2 Less than 0.5%; 0.5 percent of sodium tripolyphosphate, 0.5 percent of sodium hexametaphosphate, 3.95 percent of calcium fluoride and 0.05 percent of silicon micropowder.
3) And (3) calcining: sintering at 1350-1500 ℃ to form clinker; the weight gain of the clinker is 0.9 percent after being placed in the air for 30 days.
4) Crushing the clinker to 0-5 mm;
secondly, preparing an integral crucible bottom or crucible bottom building block and a crucible body building block
1) Heating clinker at 110-150 deg.c, adding paraffin in 2.0 wt% of the clinker and mixing, and making integral crucible bottom or building block and block blank in the crucible body separately in combined crucible structure and numbering; the height of the crucible body building block is 200-220 mm;
2) Sintering at 1400-1500 ℃;
assembly of
When the crucible bottom block is used, the whole crucible bottom or the assembled crucible bottom block is placed at the bottom of a smelting furnace, the pot body blocks are built layer by layer according to the serial numbers to form a crucible, and magnesia is tamped at the periphery of the crucible.
Smelting materials are added into the crucible for smelting.
Example two
The crucible weighed 220kg (capacity 220kg crucible) and had a bottom diameter of 350mm.
Lime matter combination crucible, at the bottom of the crucible, the crucible body is mosaic structure at the bottom of the crucible, and the crucible is at the bottom of including end core 4, end core periphery equipartition 3 end lamella 5, and the periphery of end core 4 is equipped with the step platform, and end lamella 5 inlays through step platform and end core and is connected. Have on the crucible end with crucible end plane circular arc transition at the bottom along 2, the crucible end along 2 and crucible body circular arc surface inlay and be connected, the crucible body is built by 3 layering masonry of pot body building blocks and is formed, is the circular arc surface between the crucible body building block 3 between layer and the every intraformational crucible body building block 3 and inlays the connection, and adjacent two-layer crucible body building block 3 is the fissure of displacement arrangement. The upper and lower parts of the crucible keep 1-3% of taper.
The manufacturing method of the calcareous combined crucible comprises the following steps:
1) Pulverizing natural lime to below 0.5 mm;
2) Adding sodium polyphosphate, sodium hexametaphosphate, calcium fluoride and silicon micropowder into natural lime, and uniformly mixing; 96% of natural lime, 0.5% of sodium tripolyphosphate, 0.5% of sodium hexametaphosphate, 2.98% of calcium fluoride and 0.02% of silicon micropowder.
3) And (3) calcining: sintering at 1350-1500 ℃ to form clinker; the weight gain rate of the clinker placed in the air for 30 days is 0.9 percent.
4) Crushing the cooked material to 0-5 mm;
secondly, preparing an integral crucible bottom or crucible bottom building block and a crucible body building block
1) Heating clinker at 110-150 deg.c, adding paraffin in 2.0 wt% of the clinker and mixing, and making crucible bottom block and crucible body block separately in combined crucible structure and numbering; the height of the crucible body building block is 200-220 mm;
2) Sintering at 1400-1500 ℃;
thirdly, assembling
When the crucible bottom building block is used, the assembled crucible bottom building block is placed at the bottom of a smelting furnace, the pot body building blocks are built layer by layer according to the serial numbers to form a crucible, and magnesia is tamped at the periphery of the crucible.
Adding smelting materials into the crucible for smelting.
The sintering temperature of the calcareous crucible is low, and is 1350-1500 ℃, so that the use at low-temperature sintering and high-temperature is realized. The crucible is used for smelting, and can effectively remove impurities in steel or alloy to improve the purity of the material.
CaO + FeS- - -CaS + FeO (reversible) (1)
CaO+FeS+C---CaS+Fe+CO(2)
4CaO+3FeO.P 2 O 5 ---4CaO.P 2 O 5 +3FeO(3)
CaO+Al 2 O 3 ---CaO.Al 2 O 3 (4)
Lime crucible pair adsorbing steelThe aluminum effect is obvious, and the calcium aluminate (CaO. Al) with lower melting point is generated by the rapid reaction of the aluminum and the calcium aluminate at about 1500 DEG C 2 O 3 )；4CaO.P 2 O 5 Is that the stabilizing compound is held firmly in the slag; reaction (1) is a reversible reaction, but carbon (C) in slag participates in reaction (2), caS is not dissolved in molten steel but forms slag floating on the surface of the molten steel, and salts generated by the reaction have melting points much lower than that of oxides (CaO, al) 2 O 3 ) And the slag is easy to float upwards and enter the slag.
Neither steel nor alloys are wettable to calcareous refractories. CaO has a higher high thermochemical stability and a much lower oxygen (O) partial pressure than MgO at the same temperature, which is why low oxygen (O) products can be smelted using lime refractories.
The above description is only for the purpose of illustrating the general principles of the present invention and is not to be taken in a limiting sense, and all equivalent variations and modifications are intended to be included within the scope of the appended claims.
Claims (7)
1. The utility model provides a lime matter combination crucible more than 200kg, its characterized in that, includes at the bottom of the crucible, the crucible body, at the bottom of the crucible be whole crucible end or mosaic structure, the crucible body is mosaic structure, and the bottom of crucible end top and crucible body adopts the arc surface to inlay to be connected, and the crucible body is built by pot body building block layering and is formed, is the arc surface between the crucible body building block between layer and the every intraformational crucible body building block and inlays the connection, and adjacent two-layer crucible body building block is the fissure of displacement.
2. The lime combination crucible of more than 200kg according to claim 1, wherein when the crucible bottom is of a splicing structure, the crucible bottom comprises a plurality of crucible bottom building blocks, the crucible bottom building blocks comprise a bottom core, a plurality of bottom flaps are uniformly distributed on the periphery of the bottom core, a step platform is arranged on the periphery of the bottom core, and the bottom flaps are connected with the bottom core in an embedded manner through the step platform.
3. The lime crucible as set forth in claim 1, wherein the ingredients include, by weight, 93-98% of natural lime, 0.5-2% of sodium tripolyphosphate, 0.5-2% of sodium hexametaphosphate, 0.5-3% of calcium fluoride, and 0.01-2% of silica powder.
4. The lime crucible of 200kg or more as set forth in claim 3, wherein CaO in said natural lime is greater than 90%, siO in said natural lime 2 Less than 0.5%.
5. The method for manufacturing the lime combination crucible of 200kg or more according to claim 1, which comprises the following steps:
firstly, preparing clinker
1) Pulverizing natural lime to powder of 0.5mm or less;
2) Adding sodium polyphosphate, sodium hexametaphosphate, calcium fluoride and silicon micropowder into natural lime, uniformly mixing, and then making blocks;
3) And (3) calcining: sintering the mixture into clinker at 1350-1500 ℃;
4) Crushing the cooked material to 0-5 mm;
secondly, preparing an integral crucible bottom or crucible bottom building block and a crucible body building block
1) Heating clinker at 110-150 deg.c, adding paraffin wax in 1.0-2.5 wt% of the clinker, mixing, making integral crucible bottom or building block and blank block of crucible body separately in combined crucible structure, and numbering;
2) Sintering at 1350-1500 ℃;
thirdly, assembling:
when the crucible bottom block is used, the whole crucible bottom or the assembled crucible bottom block is placed at the bottom of a smelting furnace, the pot body blocks are built layer by layer according to the serial numbers to form a crucible, and magnesia is tamped at the periphery of the crucible.
6. The method for manufacturing the lime crucible with the weight of more than 200kg as claimed in claim 5, wherein the weight gain of the clinker is less than 1% after the clinker is placed in the air for 30 days.
7. The method for manufacturing the lime composite crucible of 200kg or more according to claim 5, wherein the blank block of the integral crucible bottom or the crucible bottom block and the crucible body block in the step two.1) is formed by a hydraulic brick press or a friction brick press.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211628823.XA CN115875978A (en) | 2022-12-18 | 2022-12-18 | Lime combined crucible with weight of more than 200kg and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211628823.XA CN115875978A (en) | 2022-12-18 | 2022-12-18 | Lime combined crucible with weight of more than 200kg and preparation method |
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| CN115875978A true CN115875978A (en) | 2023-03-31 |
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| CN202211628823.XA Pending CN115875978A (en) | 2022-12-18 | 2022-12-18 | Lime combined crucible with weight of more than 200kg and preparation method |
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