CN110511000B - Periclase-chromium corundum brick for upper groove of RH furnace and preparation method thereof - Google Patents
Periclase-chromium corundum brick for upper groove of RH furnace and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of refractory materials for RH furnaces, and relates to a periclase-chromium corundum brick for an upper groove of an RH furnace and a preparation method thereof, wherein the periclase-chromium corundum brick comprises the following components in percentage by mass: the production method comprises the following steps of 35-65% of sintered magnesia particles, 10-35% of chrome corundum particles, 10-17% of magnesia fine powder, 5-10% of magnesia-alumina spinel fine powder, 2-6% of binding agent and 1-4% of antioxidant, wherein the chrome corundum is industrial waste, and the RH furnace upper groove brick with the reduced cost and the performance equivalent to that of the current RH furnace upper groove brick is obtained by optimizing components and content.
Description
Technical Field
The invention relates to the technical field of refractory materials for RH furnaces, relates to a periclase-chrome corundum brick for an upper groove of an RH furnace and a preparation method thereof, and particularly relates to a method for preparing the periclase-chrome corundum brick for the upper groove of the RH furnace by adopting fused magnesia, chrome corundum and the like as main raw materials.
Background
The smelting environment of the RH refining furnace is more severe compared with that of a ladle and a tundish, the requirement on refractory materials at the middle upper groove part of the RH refining furnace is relatively low, at present, low-grade fused magnesia or medium-grade magnesia is generally adopted as main production raw materials, but along with the fluctuation and the growth of the price of refractory raw materials in two years, particularly, the magnesia raw materials are already increased from 2000 yuan/ton to 8000 yuan/ton or even higher. This brings more production pressure to the refractory material manufacturing enterprises, and in order to further relieve the production pressure, the enterprises seek a way by lowering the cost through technology.
The chrome corundum is mainly electric melting chrome corundum, is waste produced in the process of preparing metal chrome or chrome alloy by external smelting, is generally called aluminum chrome slag, and has the main component of Al2O3Contains a certain amount ofCr2O3And a small amount of impurities such as iron, calcium and the like, is a waste material with excellent high-temperature performance and good slag resistance, and has the existing effect in the industries such as nonferrous metallurgy, glass melting furnaces, garbage melting incinerators and the like. The chrome corundum is mixed with other products produced by adding chromium oxide and aluminum oxide.
The invention prepares the periclase-chrome corundum brick for the RH furnace by using sintered magnesia and chrome corundum as aggregates, magnesia fine powder and magnesia spinel fine powder as substrates, adding a proper amount of bonding agent and antioxidant, and carrying out mixing grinding, stirring, pressing and baking.
Disclosure of Invention
The invention aims to develop a periclase-chrome corundum brick which has stable performance, higher strength and lower production cost and can completely replace an upper groove brick for the prior RH furnace by utilizing a novel waste material of chrome corundum.
The invention discloses a periclase-chromium corundum brick for an upper groove of an RH furnace, which is characterized by comprising the following components in percentage by mass: 35-65% of sintered magnesia particles, 10-35% of chrome corundum particles, 10-17% of magnesia fine powder, 5-10% of magnesia-alumina spinel fine powder, 2-6% of binding agent and 1-4% of antioxidant.
Preferably, the mass percent of the sintered magnesia particles is 35-50%.
Preferably, the mass percent of the chrome corundum particles is 20-35%.
Preferably, the mass percentage of the magnesite powder is 10-15%.
Preferably, the mass percentage of the magnesia-alumina spinel fine powder is 5-8%.
Preferably, the mass percent of the binding agent is 2-5%.
Preferably, the antioxidant is 1-3% by mass.
Preferably, the sintered magnesite grains have the grain size of 5-3mm, 3-1mm and 1-0mm, MgO percent is more than or equal to 94 percent, and the mass percentages of the magnesite grains are respectively 15-20 percent of 5-3mm grains, 10-25 percent of 3-1mm grains and 10-25 percent of 1-0mm grains.
Preferably, the chrome corundum particles are aluminum chrome slag, the particle size components are 3-1mm and 1-0mm, the mass percentages of the chrome corundum particles with the particle sizes are 5-20% of the chrome corundum particles with the particle sizes of 3-1mm and 5-15% of the chrome corundum particles with the particle sizes of 1-0mm respectively.
Preferably, the magnesite fine powder is fused magnesite, MgO percent is more than or equal to 96 percent, and the grain diameter is less than 61 mu m.
Preferably, the fine magnesium-aluminum spinel powder can be fused magnesia-alumina spinel, the particle size is less than 45 mu m, and MgO percent is more than or equal to 76 percent.
Preferably, the binder is a magnesium aluminum gel binder.
Preferably, the antioxidant is commercially available aluminum manganese alloy powder.
On the other hand, the invention also discloses a preparation method of the periclase-chromium corundum brick for the upper groove of the RH furnace, which comprises the following steps: mixing and grinding, namely adding a mixture of low-grade magnesia particles and chrome corundum particles into a stirrer, stirring uniformly, adding 1-1.5% of water, continuing stirring uniformly, adding magnesia fine powder, magnesia alumina spinel fine powder, a binding agent and an antioxidant mixture, continuing mixing for 20-25min, discharging, pressing the discharged mud material by a press immediately, naturally curing the pressed green brick in a room for 24-36h, then sending the green brick to a baking kiln for baking at the baking temperature of 220 + 280 ℃ for 24-36h, and packaging and warehousing after the green brick is cooled after baking is finished.
The components of the invention act synergistically within the limited dosage range, not only reducing the manufacturing cost, but also having the performance equivalent to the upper groove brick for the prior RH furnace, the service life of the RH upper groove brick produced by the invention is prolonged by 5-8 furnaces compared with the prior RH brick, and the production cost per ton is lower by 400-600 yuan compared with the prior RH brick.
In addition, the invention also has the following beneficial effects:
(1) firstly introducing a chrome corundum raw material into a refractory material for an RH furnace to develop a periclase-chrome corundum brick;
(2) industrial waste chrome corundum is used as a raw material, so that the production cost of the upper groove of the RH brick is reduced;
(3) chromium and aluminum introduced into the chromium corundum are solid solutions, so that chromium elements cannot be separated out and released, and the environment is harmed;
(4) water is used as a bonding agent, no pollution or harmful gas is generated in the production process, and the production process is simple;
(5) the introduced chrome corundum has high melting point and good thermal shock property, and the high-temperature index of the green brick is obviously improved.
Detailed Description
The present invention will be further described with reference to the following examples. The described embodiments and their results are only intended to illustrate the invention and should not be taken as limiting the invention described in detail in the claims.
Example 1
A periclase-chromium corundum brick for an upper groove of an RH furnace consists of the following components in percentage by weight: the sintered magnesite grains (MgO percent is more than or equal to 94 percent) have the grain diameter of 5-3mm by mass percent of 15 percent, the grain diameter of 3-1mm by mass percent of 25 percent and the grain diameter of 1-0mm by mass percent of 25 percent; 5 percent of chrome corundum (aluminum-chromium slag) with the grain diameter of 3-1mm by mass and 5 percent of grain diameter of 1-0mm by mass; the fused magnesia fine powder (MgO percent is more than or equal to 96 percent) has the particle size of less than 240 meshes (61 mu m) and the mass percent of 17 percent, the fused magnesia-alumina spinel (MgO percent is more than or equal to 76 percent) has the particle size of less than 325 meshes (45 mu m) and the mass percent of 5 percent, the magnesium-aluminum gel binding agent has the mass percent of 2 percent, and the antioxidant commercially available aluminum-manganese alloy powder has the mass percent of 1 percent.
The periclase-chromium corundum brick for the upper groove of the RH furnace is prepared by the following method:
preparing materials according to the requirement of the granularity specification; and then mixing and grinding according to every 600kg of grinding, firstly adding a mixture of sintered magnesia particles and chrome corundum particles into a stirrer, stirring for 2min, then adding 1.2-1.3% of water, continuing to stir for 1min, then adding magnesia fine powder, magnesia-alumina spinel fine powder, a binding agent and an antioxidant mixture, continuing to stir for 25min, discharging, pressing the discharged pug into bricks by a press immediately, naturally curing the pressed brick blanks indoors for 24h, then sending the bricks to a baking kiln for baking at the baking temperature of 220 ℃, keeping the temperature for 24h, and finally obtaining the finished bricks after baking.
Performance indexes of the finished brick are as follows:
the use effect is as follows:
the RH brick upper groove brick produced according to the embodiment 1 is used in a certain 250-ton domestic RH furnace, the service life can reach 308 furnaces, and the production cost is saved by 200 yuan per ton compared with the original RH brick upper groove brick.
Example 2
A periclase-chromium corundum brick for an upper groove of an RH furnace consists of the following components in percentage by weight: 20 percent of sintered particles with the grain diameter of 5-3mm, 10 percent of sintered particles with the grain diameter of 3-1mm and 20 percent of sintered particles with the grain diameter of 1-0 mm; 15 percent of chrome corundum with the grain diameter of 3-1mm and 5 percent of chrome corundum with the grain diameter of 1-0 mm; the grain diameter of the fused magnesia fine powder is less than 240 meshes, the mass percent is 15%, the grain diameter of the fused magnesia-alumina spinel is less than 325 meshes, the mass percent is 8%, the mass percent of the magnesium-aluminum gel binding agent is 4.5%, and the mass percent of the antioxidant aluminum-manganese alloy powder is 2.5%.
The periclase-chromium corundum brick for the upper groove of the RH furnace is prepared by the following method:
preparing materials according to the requirement of the granularity specification; and then, mixing and grinding every 600kg of the mixture, adding the mixture of the sintered magnesia particles and the chrome corundum particles into a stirrer, stirring for 2min, adding 1.3% of water, continuing to stir for 1min, adding the magnesia fine powder, the magnesia-alumina spinel fine powder, the binding agent and the antioxidant mixture, continuing to stir for 25min, discharging, pressing the discharged pug into bricks by a press immediately, naturally curing the pressed green bricks indoors for 24h, then sending the green bricks into a baking kiln for baking at the baking temperature of 240 ℃, keeping the temperature for 28h, and obtaining the finished bricks after baking.
Performance indexes of the finished brick are as follows:
the use effect is as follows:
the RH brick upper groove brick produced according to the embodiment 2 is used in a certain 250-ton RH furnace in China, the service life can reach 312 furnaces, and the production cost is saved by 500 yuan per ton compared with the original RH brick upper groove brick.
Example 3
A periclase-chromium corundum brick for an upper groove of an RH furnace consists of the following components in percentage by weight: 15 percent by mass of sintered particles with the particle size of 5-3mm, 10 percent by mass of sintered particles with the particle size of 3-1mm and 10 percent by mass of sintered particles with the particle size of 1-0 mm; 20 percent of chrome corundum with the grain diameter of 3-1mm, 15 percent of grain diameter of 1-0mm, 10 percent of fused magnesia fine powder with the grain diameter of less than 240 meshes, 6 percent of magnesium-aluminum gel binding agent and 4 percent of antioxidant aluminum-manganese alloy powder.
The periclase-chromium corundum brick for the upper groove of the RH furnace is prepared by the following method:
preparing materials according to the requirement of the granularity specification; and then, mixing and grinding every 600kg of the mixture, adding the mixture of the sintered magnesia particles and the chrome corundum particles into a stirrer, stirring for 2min, adding 1.3% of water, continuing to stir for 1min, adding the magnesia fine powder, the magnesia-alumina spinel fine powder, the binding agent and the antioxidant mixture, continuing to stir for 20min, discharging, pressing the discharged pug into bricks by a press immediately, naturally curing the pressed green bricks indoors for 24h, then sending the green bricks to a baking kiln for baking at the baking temperature of 280 ℃ for the heat preservation time of 36h, and finally obtaining the finished bricks after baking.
Performance indexes of the finished brick are as follows:
the use effect is as follows:
the RH brick upper groove brick produced according to the embodiment 3 is used in a certain 250-ton RH furnace in China, the service life can reach 313 furnaces at most, and the production cost is saved by 600 yuan per ton compared with the original RH brick upper groove brick.
Comparative example 1:
compared with the example 1, the periclase-spinel brick for the upper groove of the original RH furnace without introducing chrome corundum particles has 15 percent by mass of sintered magnesia particles (MgO percent is more than or equal to 94 percent) with the particle size of 5-3mm, 30 percent by mass of particle size of 3-1mm and 30 percent by mass of particle size of 1-0 mm; the particle size of the fused magnesia fine powder (MgO percent is more than or equal to 96 percent) is less than 240 meshes, the mass percent is 17 percent, the particle size of the fused magnesia-alumina spinel (MgO percent is more than or equal to 76 percent) is less than 325 meshes, the mass percent is 2 percent of the magnesium-aluminum gel binding agent, and the mass percent of the antioxidant aluminum-manganese alloy powder is 1 percent.
The method for producing the periclase-chromite corundum brick for the upper tank of the RH furnace was the same as in example 1, and the mixing and grinding amount was as in example 1.
The performance index of the product brick is as follows:
the use effect is as follows:
the comparative example 1 is the proportion of the upper groove of the original RH brick, the service life of a certain 250-ton RH furnace in China can reach 303 furnaces. Compared with the embodiment 1, the introduction of a small amount of chromium corundum particles improves various performance indexes of the RH upper groove brick and prolongs the service life.
Comparative example 2:
in comparison with example 1, 8% of chromium corundum particles are introduced, the composition of which is: the sintered magnesite grains (MgO percent is more than or equal to 94 percent) have the grain diameter of 5-3mm by mass percent of 15 percent, the grain diameter of 3-1mm by mass percent of 22 percent and the grain diameter of 1-0mm by mass percent of 22 percent; 4 percent of chrome corundum particles with the particle size of 3-1mm and 4 percent of chrome corundum particles with the particle size of 1-0 mm; the particle size of the fused magnesia fine powder (MgO percent is more than or equal to 96 percent) is less than 240 meshes, the mass percent is 17 percent, the particle size of the fused magnesia-alumina spinel (MgO percent is more than or equal to 76 percent) is less than 325 meshes, the mass percent is 2 percent of the magnesium-aluminum gel binding agent, and the mass percent of the antioxidant aluminum-manganese alloy powder is 1 percent.
The method for producing the periclase-chromite corundum brick for the upper tank of the RH furnace was the same as in example 1, and the mixing and grinding amount was as in example 1.
Performance indexes of the finished brick are as follows:
the use effect is as follows:
when a certain 250-ton RH furnace is used in China, the service life can reach 305 furnaces to the maximum, compared with the example 1, a small amount of chromium corundum particles are introduced, various performance indexes of the RH upper groove brick are reduced, and the service life is slightly reduced.
Comparative example 3:
compared with the example 3, the addition amount of the chromium corundum particles is increased to 40 percent, and the rest components and the content are unchanged. The RH brick comprises the following components in percentage by weight: 15 percent by mass of sintered particles with the particle size of 5-3mm, 10 percent by mass of sintered particles with the particle size of 3-1mm and 10 percent by mass of sintered particles with the particle size of 1-0 mm; 20 percent of chrome corundum with the grain diameter of 3-1mm, 20 percent of grain diameter of 1-0mm, 10 percent of fused magnesia-alumina spinel with the grain diameter of less than 240 meshes, 6 percent of magnesium-aluminum gel binding agent and 4 percent of antioxidant aluminum-manganese alloy powder.
The method for producing the periclase-chromite corundum brick for the upper tank of the RH furnace was the same as in example 3, and the mixing and grinding amount was as in example 3.
Performance indexes of the finished brick are as follows:
compared with the example 3, the addition of the chrome corundum is increased, the normal temperature index is reduced, but the high-temperature bending resistance obviously slides down, and after the RH upper groove brick produced by the scheme is tried in a steel mill, the service life of the RH upper groove brick is only 290 furnaces, and the service life of the RH upper groove brick cannot meet the requirement of 295 furnaces in the steel mill.
Comparative example 4:
compared with the example 1, the antioxidant is not added, and the rest components and the using amount are the same.
The production process of the RH upper tank brick was the same as in example 1, and the mixing and grinding amount was as in example 1.
Performance indexes of the finished brick are as follows:
the density of the upper groove brick is 3.19g/cm3Without reaching the required 3.20g/cm3And the indexes of high temperature and normal temperature pressure resistance are low.
Comparative example 5:
compared with example 1, 1% of the binder is added, and the rest components and the amount are the same. The components and contents of the composition are as follows: the sintered magnesite grains (MgO percent is more than or equal to 94 percent) have the grain diameter of 5-3mm by mass percent of 15 percent, the grain diameter of 3-1mm by mass percent of 25 percent and the grain diameter of 1-0mm by mass percent of 25 percent; the mass percent of the chrome corundum with the grain diameter of 3-1mm is 5%, the mass percent of the grain diameter of 1-0mm is 5%, the grain diameter of fused magnesia fine powder (MgO percent is more than or equal to 96%) is less than 240 meshes, the mass percent is 17%, the grain diameter of fused magnesia-alumina spinel (MgO percent is more than or equal to 76%) is less than 325 meshes, the mass percent is 5%, the mass percent of magnesium-aluminum gel bonding agent is 1%, and the mass percent of antioxidant aluminum-manganese alloy powder is 1%.
The production process of the RH upper tank brick was the same as in example 1, and the mixing and grinding amount was as in example 1.
Performance indexes of the finished brick are as follows:
the density of the upper groove brick is 3.19g/cm3Without reaching the required 3.20g/cm3And the indexes of high temperature and normal temperature pressure resistance are low, and the binding property of the pug is slightly poor in the production process.
Comparative example 6
Compared with example 3, the antioxidant is increased to 5%, and the rest components and the amount are unchanged (same as comparative example 5).
The production process of the RH upper channel brick was the same as in example 3, and the amount of mixing and grinding was as in example 3.
Performance indexes of the finished brick are as follows:
the antioxidant content was increased compared to example 3, and the index was not increased.
Comparative example 7
Compared with example 3, the binder is increased to 7%, and the rest components and the amount are unchanged (same as comparative example 5).
The production process of the RH upper channel brick was the same as in example 3, and the amount of mixing and grinding was as in example 3.
Performance indexes are as follows:
the antioxidant was increased and the index was somewhat degraded compared to example 3.
Claims (2)
1. The periclase-chromium corundum brick for the upper groove of the RH furnace is characterized by comprising the following components in percentage by mass: 35-65% of sintered magnesia particles, 10-35% of chrome corundum particles, 10-17% of magnesia fine powder, 5-10% of magnesia-alumina spinel fine powder, 2-6% of binding agent and 1-4% of antioxidant;
the sintered magnesite grains have the grain size of 5-3mm, 3-1mm and 1-0mm, MgO percent is more than or equal to 94 percent, and the mass percentages of the sintered magnesite grains with the grain sizes accounting for all the components are respectively 15-20 percent of grains with the grain size of 5-3mm, 10-25 percent of grains with the grain size of 3-1mm and 10-25 percent of grains with the grain size of 1-0 mm;
the chromium corundum particles are aluminum chromium slag, the particle size components are 3-1mm and 1-0mm, the mass percentage of each particle size chromium corundum in all the components is 5-20% of the chromium corundum particles with the particle size of 3-1mm and 5-15% of the chromium corundum particles with the particle size of 1-0mm respectively;
the fine magnesia powder is fused magnesia, MgO percent is more than or equal to 96 percent, and the particle size is less than 61 mu m;
the magnalium spinel fine powder is fused magnesia-alumina spinel, the particle size is less than 45 mu m, and MgO% is more than or equal to 76%;
the binding agent is a magnesium-aluminum gel binding agent;
the antioxidant is aluminum manganese alloy powder sold in the market.
2. The method for preparing a periclase-chromite brick for use in an upper tank of an RH furnace as set forth in claim 1, which comprises: mixing and grinding, namely adding a mixture of sintered magnesia particles and chrome corundum particles into a stirrer, stirring uniformly, adding 1-1.5% of water, continuing to stir uniformly, adding magnesia fine powder, magnesia alumina spinel fine powder, a binding agent and an antioxidant mixture, continuing to mix for 20-25min, discharging, pressing the discharged pug into bricks by a press immediately, naturally curing the pressed green bricks for 24-36h, then sending the green bricks to a baking kiln for baking at the baking temperature of 220 + 280 ℃ for heat preservation for 24-36h, and packaging and warehousing after the green bricks are cooled after the baking is finished.
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| CN112456974B (en) * | 2020-12-09 | 2022-11-15 | 北京金隅通达耐火技术有限公司 | Magnalium spinel brick for co-processing cement kiln and preparation method and application thereof |
| CN116396062A (en) * | 2023-04-07 | 2023-07-07 | 中钢洛耐科技股份有限公司 | Spinel composite chrome corundum brick for salt-containing wastewater incinerator and preparation method thereof |
| CN116903353B (en) * | 2023-09-14 | 2023-12-29 | 北京利尔高温材料股份有限公司 | Long-service-life ladle bottom brick and preparation method thereof |
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