CN106977215B - Converter large-surface repair material using magnesia carbon brick as main raw material and preparation method thereof - Google Patents
Converter large-surface repair material using magnesia carbon brick as main raw material and preparation method thereof Download PDFInfo
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
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Abstract
A converter large-surface repair material with magnesia carbon residue bricks as main raw materials is characterized in that magnesia carbon residue bricks are used as main raw materials, the physical and chemical properties of the raw materials are improved by a pre-sintering method to increase the high-temperature mechanical properties of prefabricated prepared materials, the prefabricated prepared materials with different grain compositions are pre-mixed with dead-burned magnesia, modified asphalt is used as a bonding agent to fully utilize secondary resources of the magnesia carbon residue bricks, and the cost of refractory materials and the steelmaking cost are reduced on the premise of ensuring the high thermal mechanical properties of the converter large-surface repair material.
Description
Technical Field
The invention relates to the field of refractory materials, in particular to a converter large-surface repair material taking magnesia carbon bricks as main raw materials.
Background
At present, all countries in the world fully recognize that the used refractory material is a cheap renewable resource, can obviously improve the economic benefit and social benefit of enterprises, and the recycling of the used refractory material also contributes to environmental protection. Therefore, in the near future, the production of high value-added recycled products from used refractory materials is rapidly advancing, the recycling rate of used refractory materials is rapidly increasing, and there is a trend toward zero emission.
For example, united states governments and companies have developed programs to extend the useful life of refractory materials and to recycle waste refractory materials. Meanwhile, in countries such as Japan, France, Italy, and Iran, there are many advances in recycling refractory materials.
The regeneration utilization rate of the waste refractory materials in Japan is higher and reaches 91.4 percent. The deer island steel plant produces about 900 tons of waste refractory materials each month, and 60 percent of the waste refractory materials are successfully recycled. The recovered refractory material can be used as a furnace aid for ladles and electric furnaces, a repairing material for sliding plates, a pouring material and a ramming material, wherein the service life of the repaired sliding plate can be the same as that of a new sliding plate by using a pouring material recovery method and a circular ring embedding method. Adding more than 30% of waste MgO-C bricks into MgO-C bricks in another steel mill, wherein the corrosion resistance of the waste MgO-C bricks is very close to that of the original products; italian company developed a method for recycling various types of furnace, tundish, ingot mould and ladle lining refractories by directly blowing the recycled refractories into the hearth to protect the walls of the furnace. The post-converter MgO-C brick lining is successfully used in Germany for the production of permanent linings for ladles and converters. The korean purneck iron and steel company has recovered the used refractory material, selected and crushed the refractory material to be used as a raw material of the refractory material, a metallurgical auxiliary material such as a slag splashing protective material and the like, a paving material and the like, and most of the refractory material is recycled although the added value is not improved. The waste magnesia-chrome bricks are used as aggregates to prepare refractory materials for casting wheel production and tapping channel, thereby reducing environmental pollution and obtaining certain economic benefit.
Most of domestic waste refractory materials are recycled at the test stage, and the recycling rate is low. The huge amount of waste refractory materials causes great waste of available resources and serious environmental pollution, and also causes great harm to human health, so that it is imperative to pay high attention to the recycling work of waste refractory materials, actively limit the mass production of waste refractory materials, and strive to promote the development and research of waste refractory material recycling technology.
Disclosure of Invention
The invention aims to provide a converter large-surface repair material taking magnesia carbon residue bricks as main raw materials, which takes the magnesia carbon residue bricks as the main raw materials, improves the physical and chemical properties of the raw materials by a pre-sintering method, is used for increasing the high-temperature mechanical properties of prefabricated prepared materials, pre-mixes the prefabricated prepared materials with different grain compositions with dead-burned magnesia, takes modified asphalt as a bonding agent, fully utilizes secondary resources of the magnesia carbon residue bricks, and reduces the cost of refractory materials and the steelmaking cost on the premise of ensuring the high thermal mechanical properties of the converter large-surface repair material.
In order to achieve the purpose, the invention adopts the following technical scheme:
a converter large-surface repairing material taking magnesia carbon bricks as main raw materials is prepared from the following raw materials in parts by weight:
aggregate: 75-114 parts of magnesia carbon brick residue and 10-20 parts of 200-mesh dead-burned magnesia;
preparing materials: 1-3 parts of metal iron powder with the particle size of 200 meshes, 1-2 parts of yttrium oxide and 2-5 parts of dicalcium silicate;
binding agent: 10-15 parts of asphalt, 1-3 parts of sodium oleate and 0.5-1 part of magnesium silicate;
additive: 1-3 parts of diesel oil.
A preparation method of a converter large-surface repair material taking magnesia carbon bricks as main raw materials comprises the following steps:
1) classifying the magnesia carbon bricks, sampling and detecting, spraying and hydrating the bricks twice a day for not less than one week, and sorting; carrying out jaw crushing on the sorted magnesia carbon residual bricks, drying, carrying out magnetic separation, and sampling and detecting the magnesia carbon residual bricks after the magnetic separation;
2) crushing the magnesia carbon brick residue in a crusher according to the parts by weight to prepare magnesia carbon brick residue particles with the particle size of 200 meshes;
3) premixing the magnesia carbon brick residue of 200 meshes prepared in the step 2) with the metal iron powder, the dicalcium silicate and the yttrium oxide in parts by weight in a mixer for not less than 2 hours;
4) briquetting and sintering the uniformly premixed mixed raw materials in the step 3) to prepare block raw materials, wherein the sintering temperature is 1550-1560 ℃;
5) putting the block raw material obtained after sintering into a crusher again for crushing, and sieving and finely grinding the raw material to respectively prepare four kinds of particle size raw materials with the particle size of more than 5 and less than or equal to 8mm, the particle size of more than 3 and less than or equal to 5mm, the particle size of more than 1 and less than or equal to 3mm and the particle size of more than 0 and less than or equal to 1 mm;
the weight parts of the four particle size raw materials are as follows: 24-36 parts of raw materials with the granularity of more than 5mm and less than or equal to 8mm, 18-31 parts of raw materials with the granularity of more than 3mm and less than or equal to 5mm, 18-31 parts of raw materials with the granularity of more than 1mm and less than or equal to 3mm, and 19-26 parts of raw materials with the granularity of more than 0 and less than or equal to 1 mm;
6) preparing a binding agent: adding the sodium oleate and the magnesium silicate in parts by weight into the asphalt, and mixing and stirring to uniformly mix the materials;
7) premixing the granular raw material with the granularity of more than 0 and less than or equal to 1mm obtained in the step 5) with diesel oil, then adding the binding agent prepared in the step 6), then respectively adding the granular raw material with the granularity of more than 5 and less than or equal to 8mm, more than 3 and less than or equal to 5mm and more than 1 and less than or equal to 3mm obtained in the step 5) and 200-mesh dead burnt magnesia, carrying out net mixing in a sand mixer for not less than 12min, and finally discharging.
Compared with the prior art, the invention has the beneficial effects that:
1) the method comprises the steps of sintering the sorted qualified magnesia carbon brick residues and yttrium oxide at the temperature of about 1550 ℃ to prepare a prefabricated raw material of the large-surface repair material, wherein the composite rare earth oxide existing in the prefabricated raw material is beneficial to improving the high-temperature breaking strength of the magnesia refractory material, so that the sintered material has good high-temperature mechanical property, and the thermal shock stability of the material is effectively improved.
2) Part of rare earth silicate phase generated by the reaction of dicalcium silicate and yttrium oxide can enter into the periclase crystal grains, so that the stability and compactness of the brick body are improved, and the high-temperature mechanical property of the repair material can be further improved. Meanwhile, the dicalcium silicate is used as a stabilizer to promote the sintering of the patching material in a high-temperature working environment.
3) Energy conservation and environmental protection, reduces the production cost and promotes the recycling of the waste refractory materials.
4) The diesel oil is used as an additive, and the modified asphalt prepared by mixing asphalt, sodium oleate and magnesium silicate is used as a bonding agent, so that the high-temperature fluidity is good, and the sintering time is short.
Detailed Description
The following further illustrates embodiments of the invention:
a converter large-surface repairing material taking magnesia carbon bricks as main raw materials is prepared from the following raw materials in parts by weight:
aggregate: 75-114 parts of magnesia carbon brick residue and 10-20 parts of 200-mesh dead-burned magnesia.
Chemical group in magnesia carbon brick residueThe weight percentage of the components is as follows: MgO is more than or equal to 80 percent, CaO is less than or equal to 1.4 percent, and SiO2≤2.2％，Fe2O3Less than or equal to 0.9 percent, and the volume density is more than or equal to 3.10 g/cm3。
91 dead burned magnesia fine powder with the grain size of 200 meshes is adopted, and the weight percentage of the chemical components is as follows: MgO is more than or equal to 91 percent, CaO is less than or equal to 1.5 percent, and SiO2≤2.5％，Fe2O3Less than or equal to 1.8 percent, and the volume density is more than or equal to 3.20 g/cm3。
Preparing materials: 1-3 parts of metal iron powder with the particle size of 200 meshes, 1-2 parts of yttrium oxide and 2-5 parts of dicalcium silicate.
Binding agent: 10-15 parts of asphalt, 1-3 parts of sodium oleate and 0.5-1 part of magnesium silicate.
Additive: 1-3 parts of diesel oil.
A preparation method of a converter large-surface repair material taking magnesia carbon bricks as main raw materials comprises the following steps:
1) classifying the magnesia carbon bricks, sampling and detecting, spraying and hydrating the bricks twice a day for not less than one week, and sorting; carrying out jaw crushing on the sorted magnesia carbon residual bricks, drying, carrying out magnetic separation, sampling and detecting the magnetically separated magnesia carbon residual bricks, and using the magnesia carbon residual bricks after being qualified;
2) crushing the qualified magnesia carbon brick residues for later use in a crusher according to the parts by weight to prepare magnesia carbon brick residues with the particle size of 200 meshes;
3) premixing the magnesia carbon brick residue of 200 meshes prepared in the step 2) with the metal iron powder, the dicalcium silicate and the yttrium oxide in parts by weight in a mixer for not less than 2 hours;
4) briquetting and sintering the uniformly premixed mixed raw materials in the step 3) to prepare block raw materials, wherein the sintering temperature is 1550-1560 ℃;
5) putting the block raw material obtained after sintering into a crusher again for crushing, and sieving and finely grinding the raw material to respectively prepare four kinds of particle size raw materials with the particle size of more than 5 and less than or equal to 8mm, the particle size of more than 3 and less than or equal to 5mm, the particle size of more than 1 and less than or equal to 3mm and the particle size of more than 0 and less than or equal to 1 mm;
the weight parts of the four particle size raw materials are as follows: 24-36 parts of raw materials with the granularity of more than 5mm and less than or equal to 8mm, 18-31 parts of raw materials with the granularity of more than 3mm and less than or equal to 5mm, 18-31 parts of raw materials with the granularity of more than 1mm and less than or equal to 3mm, and 19-26 parts of raw materials with the granularity of more than 0 and less than or equal to 1 mm;
6) preparing a binding agent: adding the sodium oleate and the magnesium silicate in parts by weight into the asphalt, and mixing and stirring to uniformly mix the materials;
7) premixing the granular raw material with the granularity of more than 0 and less than or equal to 1mm obtained in the step 5) with diesel oil, then adding the binding agent prepared in the step 6), then respectively adding the granular raw material with the granularity of more than 5 and less than or equal to 8mm, more than 3 and less than or equal to 5mm and more than 1 and less than or equal to 3mm obtained in the step 5) and 200-mesh dead burnt magnesia, carrying out net mixing in a sand mixer for not less than 12min, and finally discharging.
The physical and chemical indexes of the finished product are shown in the table 1:
table 1: physical and chemical indexes of finished product
Examples are shown in Table 2:
table 2: formula of embodiment of converter large-surface repair material taking magnesia carbon residual bricks as main raw materials
The physical and chemical indexes of the six groups of embodiments all meet the requirements of steel smelting, the physical and chemical properties of the raw materials are changed by adopting the magnesia carbon brick residues as the main raw materials and adopting a pre-sintering method to increase the high-temperature mechanical properties of the prefabricated prepared materials, so that the high-quality secondary utilization of the magnesia carbon brick residues is realized, the high-performance converter large-surface repairing material is prepared, and the service life of the converter large-surface repairing material is more than 35 furnaces on average.
Claims (1)
1. The converter large-surface repair material taking the magnesia carbon brick as a main raw material is characterized by being prepared from the following raw materials in parts by weight:
aggregate: 75-114 parts of magnesia carbon brick residue and 10-20 parts of 200-mesh dead-burned magnesia;
preparing materials: 1-3 parts of metal iron powder with the particle size of 200 meshes, 1-2 parts of yttrium oxide and 2-5 parts of dicalcium silicate;
binding agent: 10-15 parts of asphalt, 1-3 parts of sodium oleate and 0.5-1 part of magnesium silicate;
additive: 1-3 parts of diesel oil;
the preparation method of the converter large-surface repair material taking the magnesia carbon brick as the main raw material comprises the following specific steps:
1) classifying the magnesia carbon bricks, sampling and detecting, spraying and hydrating the bricks twice a day for not less than one week, and sorting; carrying out jaw crushing on the sorted magnesia carbon residual bricks, drying, carrying out magnetic separation, sampling and detecting the magnetically separated magnesia carbon residual bricks, and using the magnesia carbon residual bricks after being qualified;
2) crushing 75-114 parts of qualified magnesia carbon brick residue to be used in a crusher to prepare magnesia carbon brick residue particles with the particle size of 200 meshes;
3) premixing the 200-mesh magnesia carbon brick residue prepared in the step 2) with 1-3 parts of metal iron powder, 2-5 parts of dicalcium silicate and 1-2 parts of yttrium oxide in a mixer for not less than 2 hours;
4) briquetting and sintering the uniformly premixed mixed raw materials in the step 3) to prepare a block raw material, wherein the sintering temperature is 1550-1560 ℃, part of rare earth silicate phase generated by the reaction of dicalcium silicate and yttrium oxide can enter periclase crystal grains, so that the stability and compactness of the brick body are improved, and the high-temperature mechanical property of the repair material can be further improved;
5) putting the block raw material obtained after sintering into a crusher again for crushing, and sieving and finely grinding the raw material to respectively prepare four kinds of particle size raw materials with the particle size of more than 5 and less than or equal to 8mm, the particle size of more than 3 and less than or equal to 5mm, the particle size of more than 1 and less than or equal to 3mm and the particle size of more than 0 and less than or equal to 1 mm;
the weight parts of the four particle size raw materials are as follows: 24-36 parts of raw materials with the granularity of more than 5mm and less than or equal to 8mm, 18-31 parts of raw materials with the granularity of more than 3mm and less than or equal to 5mm, 18-31 parts of raw materials with the granularity of more than 1mm and less than or equal to 3mm, and 19-26 parts of raw materials with the granularity of more than 0 and less than or equal to 1 mm;
6) preparing a binding agent: adding 1-3 parts of sodium oleate and 0.5-1 part of magnesium silicate into asphalt, mixing and stirring to uniformly mix the materials;
7) premixing the granular raw material with the granularity of more than 0 and less than or equal to 1mm obtained in the step 5) with diesel oil, then adding the binding agent prepared in the step 6), then respectively adding the granular raw material with the granularity of more than 5 and less than or equal to 8mm, more than 3 and less than or equal to 5mm and more than 1 and less than or equal to 3mm obtained in the step 5) and 200-mesh dead-burned magnesia, carrying out net mixing in a sand mixer for not less than 12min, and finally discharging;
meanwhile, the dicalcium silicate is used as a stabilizer to promote the sintering of the patching material in a high-temperature working environment.
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| CN112552029A (en) * | 2020-11-30 | 2021-03-26 | 中国地质大学（北京） | Method for preparing converter hot-state repairing material by using used re-fired magnesia bricks |
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| CN1088193A (en) * | 1992-12-15 | 1994-06-22 | 大连理工大学 | The making method of steel slag refractory material |
| CN102115334B (en) * | 2009-12-31 | 2014-04-16 | 鞍钢实业集团有限公司一钢分公司 | Low-cost magnesia converter lining patching material and preparation method thereof |
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