CN110511000A - A kind of RH furnace upper slot periclase-chrome corundum brick and preparation method thereof - Google Patents

A kind of RH furnace upper slot periclase-chrome corundum brick and preparation method thereof Download PDF

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CN110511000A
CN110511000A CN201910938544.5A CN201910938544A CN110511000A CN 110511000 A CN110511000 A CN 110511000A CN 201910938544 A CN201910938544 A CN 201910938544A CN 110511000 A CN110511000 A CN 110511000A
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periclase
upper slot
partial size
particle
furnace
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CN110511000B (en
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卢咏明
陈海山
张小红
崔任渠
郁书中
彭学峰
赵杰夫
汪朝晖
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Ruitai Magang New Mstar Technology Ltd
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Ruitai Magang New Mstar Technology Ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • 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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    • C04B2235/32—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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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/40—Metallic constituents or additives not added as binding phase
    • C04B2235/402—Aluminium
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Abstract

The present invention relates to RH furnace technical field of refractory materials, it is related to a kind of RH furnace upper slot periclase-chrome corundum brick and preparation method thereof, periclase-the chrome corundum brick includes the component of following mass percent: the magnesite clinker particle of 35-65%, 10-35% pink fused alumina particle, 10-17% magnesia powder, the magnesium aluminate spinel fine powder of 5-10%, the antioxidant of 2-6% bonding agent and 1-4%, the pink fused alumina is industrial waste, by optimizing component, content, obtain cost reduction, performance and the current RH furnace comparable RH furnace upper slot brick of upper slot brick, industrial application discovery, service life improves 5-10 furnace than original RH brick, production cost is per ton relatively low about 600 yuan original.

Description

A kind of RH furnace upper slot periclase-chrome corundum brick and preparation method thereof
Technical field
The present invention relates to RH furnace technical field of refractory materials, are related to a kind of RH furnace upper slot periclase-chrome corundum brick And preparation method thereof, and in particular to it is a kind of that fused magnesite, pink fused alumina etc. is used to prepare RH furnace upper slot side magnesium for primary raw material Stone-chrome corundum brick method.
Background technique
RH refining furnace smelting environment is all more harsh compared to ladle, middle packet, and in RH refining furnace middle and upper part, groove location is to fire resisting The requirement of material is relatively low, general at present to use compared with low taste fused magnesite or medium-grade magnesite as main production raw material, but With nearly 2 years, the fluctuation of fireproof raw material price and length is climbed, especially magnesia class raw material is already from 2000 yuan/ton once Rise to 8000 yuan/ton, it is even higher.This just brings bigger production pressure to refractory materials manufacturing enterprise, in order to further delay Outlet is originally sought by technology drop by solution production pressure, enterprise.
Pink fused alumina is mainly electric smelting pink fused alumina, is the waste generated when preparing crome metal or evanohm with smelting outside furnace, Commonly referred to as aluminium chromium slag, main component Al2O3, contain certain Cr2O3, and the impurity such as a small amount of iron calcium, it is a kind of with excellent The waste material of good high-temperature behavior, good resistance to slag has been efficiently applied to nonferrous metallurgy, glass melter, rubbish melting incinerating furnace at present Etc. industries.The pink fused alumina passes through addition chromium oxide and the product of alumina producing with other.
The present invention is by the way that using magnesite clinker, pink fused alumina as aggregate, magnesia powder, magnesia spinel fine powder are as matrix, together The appropriate bonding agent of Shi Tianjia, antioxidant, through mixed grind, stirring, compacting, baking and to prepare a kind of RH furnace periclase-chromium rigid Beautiful brick.
Summary of the invention
Present invention aims at this novel scrap feed material of pink fused alumina is utilized, develop that a kind of performance is stable, intensity is higher, it is raw Cost is relatively low for production, and can substitute periclase-chrome corundum brick of current RH furnace upper slot brick completely.
Specifically, the invention discloses a kind of RH furnace upper slot periclase-chrome corundum bricks, which is characterized in that party's magnesium Stone-chrome corundum brick includes the component of following mass percent: the magnesite clinker particle of 35-65%, 10-35% pink fused alumina particle, 10-17% magnesia powder, the magnesium aluminate spinel fine powder of 5-10%, 2-6% bonding agent and 1-4% antioxidant.
Preferably, magnesite clinker granular mass percentage is 35-50%.
Preferably, pink fused alumina granular mass percentage is 20-35%.
Preferably, magnesia powder mass percent is 10-15%.
Preferably, magnesium aluminate spinel fine powder mass percent is 5-8%.
Preferably, bonding agent mass percent is 2-5%.
Preferably, antioxidant mass percent is 1-3%.
Preferably, the magnesite clinker partial size group becomes 5-3mm, 3-1mm, 1-0mm, MgO% >=94%, each partial size magnesia Mass percent is respectively 5-3mm particle 15-20%, 3-1mm particle 10-25%, 1-0mm particle 10-25%.
Preferably, the pink fused alumina particle is aluminium chromium slag, and partial size group becomes 3-1mm, 1-0mm, each partial size pink fused alumina quality Percentage is respectively 3-1mm pink fused alumina particle 5-20%, 1-0mm pink fused alumina particle 5-15%.
Preferably, the magnesia powder is fused magnesite, MgO%>=96%, partial size<61 μm.
Preferably, the brilliant fine powder of magnalium point can be electric melting magnesium aluminum spinel, partial size<45 μm, MgO%>=76%.
Preferably, the bonding agent is magnalium gel bonding agent.
Preferably, the antioxidant is commercially available alumal powder.
On the other hand, the invention also discloses RH furnace upper slot periclase-chrome corundum bricks described in any of the above embodiments Preparation method, comprising: mixed grind is first added low-grade magnesia particle, in pink fused alumina particle mixture to blender, stirs evenly Afterwards, 1%-1.5% water is added, continues to be stirring evenly and then adding into magnesia powder, magnesium aluminate spinel fine powder, bonding agent and antioxidant Mixture, continueing to mix 20-25min can discharge, and gone out pug can press pressed machine brick immediately, and repressed adobe Indoor Natural is supported Shield after -36h, is sent to roasting kiln and is toasted for 24 hours, and 220-280 DEG C of baking temperature, soaking time 24-36h, baking terminates cold to adobe But it can be packed and stored after.
Each component of the present invention acts synergistically in the amount ranges of restriction, not only reduces manufacturing cost, also tool and current RH The furnace comparable performance of upper slot brick, RH upper slot brick produced by the invention, service life improves 5-8 furnace than original RH brick, raw Produce cost relatively original low 400-600 member per ton.
In addition, the present invention also has the following beneficial effects:
(1) pink fused alumina raw material is introduced into RH furnace refractory material for the first time, develops periclase-chrome corundum brick；
(2) using industrial waste pink fused alumina as raw material, RH brick upper slot production cost is reduced；
(3) chromium and aluminium being introduced into pink fused alumina are solid solution, chromium will not be precipitated and discharge, to environmental danger；
(4) using water as bonding agent, production process is pollution-free or pernicious gas generates, and production process is simple；
(5) the pink fused alumina fusing point introduced is high, and thermal shock resistance is good, hence it is evident that improves adobe high temperature index.
Specific embodiment
The present invention will be further described with reference to the examples below.Described embodiment and its result are merely to illustrate The present invention, without the present invention described in detail in claims should will not be limited.
Embodiment 1
A kind of RH furnace upper slot periclase-chrome corundum brick, is made of: magnesite clinker particle following component and content The mass percent that (MgO% >=94%) partial size is 5-3mm is 15%, the mass percent that partial size is 3-1mm is 25%, partial size Mass percent for 1-0mm is 25%；The mass percent that pink fused alumina (aluminium chromium slag) partial size is 3-1mm is 5%, partial size 1- The mass percent of 0mm is 5%；Fused magnesite fine powder (MgO% >=96%) partial size is less than 240 mesh (61 μm), mass percent It is 17%, electric melting magnesium aluminum spinel (MgO% >=76%) partial size is 5% less than 325 mesh (45 μm) mass percent, magnalium gel Bonding agent mass percent 2%, the commercially available alumal powder mass percent 1% of antioxidant.
RH furnace upper slot is prepared via a method which with periclase-chrome corundum brick:
System material is required according to size specification；Then according to every stone roller 600kg mixed grind, magnesite clinker particle, pink fused alumina is first added In particle mixture to blender, stir 2min after, the water of 1.2-1.3% is added, continue stir 1min after be added magnesia powder, Magnesium aluminate spinel fine powder, bonding agent and antioxidant mixture, continuing stirring 25min can discharge, and gone out pug can press immediately Pressed machine brick send to roasting kiln and toasts after repressed adobe Indoor Natural maintenance for 24 hours, and 220 DEG C of baking temperature, soaking time For 24 hours, baking terminates that finished bricks can be obtained.
Finished bricks performance indicator:
Using effect:
Certain 250 tons of RH furnace uses the RH brick upper slot brick produced according to embodiment 1 at home, and service life can reach 308 furnaces, the more former RH upper slot brick of production cost is per ton to save 200 yuan.
Embodiment 2
A kind of RH furnace upper slot periclase-chrome corundum brick, is made of following component and content: sintered particles partial size is 5- The mass percent that the mass percent that the mass percent of 3mm is 20%, partial size is 3-1mm is 10%, partial size is 1-0mm is 20%；The mass percent that the mass percent that pink fused alumina partial size is 3-1mm is 15%, partial size is 1-0mm is 5%；Electric-melting magnesium Sand fine powder partial size is less than 325 mesh mass percents less than 240 mesh, mass percent 15%, electric melting magnesium aluminum spinel partial size 8%, magnalium gel bonding agent mass percent 4.5%, antioxidant alumal powder mass percent 2.5%.
RH furnace upper slot is prepared via a method which with periclase-chrome corundum brick:
System material is required according to size specification；Then magnesite clinker particle, pink fused alumina particle is first added in every stone roller 600kg mixed grind In mixture to blender, after stirring 2min, 1.3% water is added, continues that magnesia powder, magnalium point crystalline substance is added after stirring 1min Stone fine powder, bonding agent and antioxidant mixture, continuing stirring 25min can discharge, and gone out pug can press pressed machine brick immediately, warp After the maintenance for 24 hours of repressed brick base Indoor Natural, send to roasting kiln and toast, 240 DEG C of baking temperature, soaking time 28h, baking terminates Finished bricks can be obtained.
Finished bricks performance indicator:
Using effect:
Certain 250 tons of RH furnace uses the RH brick upper slot brick produced according to embodiment 2 at home, and service life can reach 312 furnaces, the more former RH upper slot brick of production cost is per ton to save 500 yuan.
Embodiment 3
A kind of RH furnace upper slot periclase-chrome corundum brick, is made of following component and content: sintered particles partial size is 5- The mass percent that the mass percent that the mass percent of 3mm is 15%, partial size is 3-1mm is 10%, partial size is 1-0mm is 10%；The mass percent that the mass percent that pink fused alumina partial size is 3-1mm is 20%, partial size is 1-0mm is 15%, electric-melting magnesium Sand fine powder partial size is less than 325 mesh mass percents less than 240 mesh, mass percent 10%, electric melting magnesium aluminum spinel partial size 10%, magnalium gel bonding agent mass percent 6%, antioxidant alumal powder mass percent 4%.
RH furnace upper slot is prepared via a method which with periclase-chrome corundum brick:
System material is required according to size specification；Then magnesite clinker particle, pink fused alumina particle is first added in every stone roller 600kg mixed grind In mixture to blender, after stirring 2min, 1.3% water is added, continues that magnesia powder, magnalium point crystalline substance is added after stirring 1min Stone fine powder, bonding agent and antioxidant mixture, continuing stirring 20min can discharge, and gone out pug can press pressed machine brick immediately, warp After the maintenance for 24 hours of repressed brick base Indoor Natural, send to roasting kiln and toast, 280 DEG C of baking temperature, soaking time 36h, baking terminates Finished bricks can be obtained.
Finished bricks performance indicator:
Using effect:
Certain 250 tons of RH furnace uses the RH brick upper slot brick produced according to embodiment 3 at home, and service life can reach 313 furnaces, the more former RH upper slot brick of production cost is per ton to save 600 yuan.
Comparative example 1:
Compared with embodiment 1, the former RH furnace upper slot periclase-spinel brick of pink fused alumina particle is not introduced, is sintered magnesium The mass percent that sand particle (MgO% >=94%) partial size is 5-3mm is 15%, the mass percent that partial size is 3-1mm is 30%, the mass percent that partial size is 1-0mm is 30%；Fused magnesite fine powder (MgO% >=96%) partial size is less than 240 mesh, matter Measuring percentage is 17%, and electric melting magnesium aluminum spinel (MgO% >=76%) partial size is 5% less than 325 mesh mass percents, and magnalium is solidifying Cementing mixture mass percent 2%, antioxidant alumal powder mass percent 1%.
The preparation method is the same as that of Example 1 with periclase-chrome corundum brick for RH furnace upper slot, and mixed grind amount is referring to embodiment 1.
Product brick performance indicator:
Using effect:
Comparative example 1 is original RH brick upper slot proportion, certain 250 tons of RH furnace uses at home, and the service life can reach 303 furnaces. Compared with embodiment 1, a small amount of pink fused alumina particle is introduced, RH upper slot brick performance indexes is improved, and service life is improved.
Comparative example 2:
Compared with embodiment 1,8% pink fused alumina particle is introduced, group is grouped as are as follows: magnesite clinker particle (MgO% >= 94%) mass percent that the mass percent that partial size is 5-3mm is 15%, partial size is 3-1mm is 22%, partial size 1-0mm Mass percent be 22%；Partial size is 3-1mm pink fused alumina particle 4%, and partial size is 1-0mm pink fused alumina particle 4%；Fused magnesite Fine powder (MgO% >=96%) partial size is less than 240 mesh, mass percent 17%, electric melting magnesium aluminum spinel (MgO% >=76%) grain Diameter is 5% less than 325 mesh mass percents, magnalium gel bonding agent mass percent 2%, antioxidant alumal silty amount Percentage 1%.
The preparation method is the same as that of Example 1 with periclase-chrome corundum brick for RH furnace upper slot, and mixed grind amount is referring to embodiment 1.
Finished bricks performance indicator:
Using effect:
Certain 250 tons of RH furnace uses at home, and the service life can reach 305 furnaces, and compared with embodiment 1, it is rigid to introduce a small amount of chromium Beautiful particle, RH upper slot brick performance indexes have decline, and service life slightly reduces.
Comparative example 3:
Compared with embodiment 3, pink fused alumina particle loads are improved to 40%, remaining component and content are constant.RH brick ingredient By weight percentage are as follows: the mass percent that the mass percent that sintered particles partial size is 5-3mm is 15%, partial size is 3-1mm The mass percent for being 1-0mm for 10%, partial size is 10%；The mass percent that pink fused alumina partial size is 3-1mm is 20%, partial size Mass percent for 1-0mm is 20%, and fused magnesite fine powder partial size is less than 240 mesh, mass percent 10%, electric melting magnesium-aluminium Spinel particle size is 10% less than 325 mesh mass percents, magnalium gel bonding agent mass percent 6%, antioxidant aluminium manganese Alloyed powder mass percent 4%.
RH furnace upper slot is with periclase-chrome corundum brick preparation method with embodiment 3, and mixed grind amount is referring to embodiment 3.
Finished bricks performance indicator:
Compared with embodiment 3, pink fused alumina additional amount is improved, room temperature index has decline, but high temperature fracture resistance obviously glides, For the RH upper slot brick of program production after steel mill is on probation, service life only has 290 furnaces, fails to reach 295 furnace of steel mill and uses the longevity Life requires.
Comparative example 4:
Compared with Example 1 compared with not adding antioxidant, remaining component and dosage are all the same.
RH upper slot brick production technology is with embodiment 1, and mixed grind amount is referring to embodiment 1.
Finished bricks performance indicator:
Upper slot brick density 3.19g/cm3, do not reach requirement 3.20g/cm3, and high temperature and room temperature pressure resistance index are inclined It is low.
Comparative example 5:
Compared with Example 1 compared with 1% bonding agent of addition, remaining component and dosage are all the same.Its component and content composition Are as follows: the mass percent that magnesite clinker particle (MgO% >=94%) partial size is 5-3mm is 15%, the quality hundred that partial size is 3-1mm Dividing than being the mass percent that 25%, partial size is 1-0mm is 25%；The mass percent that pink fused alumina partial size is 3-1mm is 5%, The mass percent that partial size is 1-0mm is 5%, and fused magnesite fine powder (MgO% >=96%) partial size is less than 240 mesh, quality percentage Than being 17%, electric melting magnesium aluminum spinel (MgO% >=76%) partial size is 5% less than 325 mesh mass percents, and magnalium gel combines Agent mass percent 1%, antioxidant alumal powder mass percent 1%.
RH upper slot brick production technology is with embodiment 1, and mixed grind amount is referring to embodiment 1.
Finished bricks performance indicator:
Upper slot brick density 3.19g/cm3, do not reach requirement 3.20g/cm3, and high temperature and room temperature pressure resistance index are inclined Low, pug associativity is slightly poor in production process.
Comparative example 6
Compared with embodiment 3, antioxidant is improved to 5%, remaining component and dosage are constant (with comparative example 5).
RH upper slot brick production technology is with embodiment 3, and mixed grind amount is referring to embodiment 3.
Finished bricks performance indicator:
Compared with embodiment 3, oxidation preventive content is improved, index does not increase.
Comparative example 7
Compared with embodiment 3, bonding agent is improved to 7%, remaining component and dosage are constant (with comparative example 5).
RH upper slot brick production technology is with embodiment 3, and mixed grind amount is referring to embodiment 3.
Performance indicator:
Compared with embodiment 3, antioxidant is improved, index is glided.

Claims (8)

1. a kind of RH furnace upper slot periclase-chrome corundum brick, which is characterized in that the periclase-chrome corundum brick includes following matter Measure the component of percentage: magnesite clinker particle, the 10-35% pink fused alumina particle, 10-17% magnesia powder, 5-10% of 35-65% Magnesium aluminate spinel fine powder, 2-6% bonding agent and 1-4% antioxidant.
2. RH furnace upper slot periclase-chrome corundum brick according to claim 1, which is characterized in that the magnesite clinker Partial size group becomes 5-3mm, 3-1mm, 1-0mm, and MgO% >=94%, each partial size magnesia mass percent is respectively 5-3mm particle 15-20%, 3-1mm particle 10-25%, 1-0mm particle 10-25%.
3. RH furnace upper slot periclase-chrome corundum brick according to claim 1, which is characterized in that the pink fused alumina Grain is aluminium chromium slag, and partial size group becomes 3-1mm, 1-0mm, and each partial size pink fused alumina mass percent is respectively 3-1mm pink fused alumina particle 5-20%, 1-0mm pink fused alumina particle 5-15%.
4. RH furnace upper slot periclase-chrome corundum brick according to claim 1, which is characterized in that the magnesia powder For fused magnesite, MgO%>=96%, partial size<61 μm.
5. RH furnace upper slot periclase-chrome corundum brick according to claim 1, which is characterized in that the magnalium point is brilliant Fine powder can be electric melting magnesium aluminum spinel, partial size<45 μm, MgO%>=76%.
6. RH furnace upper slot periclase-chrome corundum brick according to claim 1, which is characterized in that the bonding agent is Magnalium gel bonding agent.
7. RH furnace upper slot periclase-chrome corundum brick according to claim 1, which is characterized in that the antioxidant For commercially available alumal powder.
8. claim 1-7 described in any item RH furnace upper slots periclase-chrome corundum brick preparation method, comprising: mixed grind, Low-grade magnesia particle is first added, in pink fused alumina particle mixture to blender, after mixing evenly, 1%-1.5% water is added, after It is continuous to be stirring evenly and then adding into magnesia powder, magnesium aluminate spinel fine powder, bonding agent and antioxidant mixture, continues to mix 20- 25min can discharge, and gone out pug can press pressed machine brick immediately, and repressed adobe Indoor Natural maintenance after -36h, is sent to baking for 24 hours Heating-up furnace baking, 220-280 DEG C of baking temperature, soaking time 24-36h, baking terminates to be packed and stored after adobe is cooling.
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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
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