CN102584285A - Magnesium-carbon material used for grate-layer material of rotary hearth furnaces and preparation method thereof - Google Patents
Magnesium-carbon material used for grate-layer material of rotary hearth furnaces and preparation method thereof Download PDFInfo
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- CN102584285A CN102584285A CN2012100217438A CN201210021743A CN102584285A CN 102584285 A CN102584285 A CN 102584285A CN 2012100217438 A CN2012100217438 A CN 2012100217438A CN 201210021743 A CN201210021743 A CN 201210021743A CN 102584285 A CN102584285 A CN 102584285A
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- carbon brick
- rotary hearth
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- 239000000463 material Substances 0.000 title claims abstract description 66
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 238000002360 preparation method Methods 0.000 title claims description 14
- 239000003575 carbonaceous material Substances 0.000 title abstract 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 53
- 239000011449 brick Substances 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000005011 phenolic resin Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001051 Magnalium Inorganic materials 0.000 claims abstract description 6
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 3
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 116
- 239000000395 magnesium oxide Substances 0.000 claims description 58
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 29
- 229910052749 magnesium Inorganic materials 0.000 claims description 29
- 239000011777 magnesium Substances 0.000 claims description 29
- 239000000654 additive Substances 0.000 claims description 22
- 230000000996 additive effect Effects 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 230000002378 acidificating effect Effects 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 238000006253 efflorescence Methods 0.000 claims description 8
- 235000013379 molasses Nutrition 0.000 claims description 8
- 206010037844 rash Diseases 0.000 claims description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000005304 joining Methods 0.000 claims description 7
- 229920001568 phenolic resin Polymers 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000013467 fragmentation Methods 0.000 claims description 6
- 238000006062 fragmentation reaction Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000007885 magnetic separation Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000008188 pellet Substances 0.000 abstract description 17
- 238000007599 discharging Methods 0.000 abstract description 7
- 239000010459 dolomite Substances 0.000 abstract description 2
- 229910000514 dolomite Inorganic materials 0.000 abstract description 2
- 229910052580 B4C Inorganic materials 0.000 abstract 1
- 238000005054 agglomeration Methods 0.000 abstract 1
- 230000002776 aggregation Effects 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 abstract 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 abstract 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 abstract 1
- 235000014380 magnesium carbonate Nutrition 0.000 abstract 1
- 239000001095 magnesium carbonate Substances 0.000 abstract 1
- 238000011946 reduction process Methods 0.000 abstract 1
- 239000011863 silicon-based powder Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 229920001187 thermosetting polymer Polymers 0.000 abstract 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 abstract 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- 238000005453 pelletization Methods 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000015895 biscuits Nutrition 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229960003280 cupric chloride Drugs 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- -1 iron content Chemical compound 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 238000009923 sugaring Methods 0.000 description 1
Abstract
The invention relates to a method for preparing a magnesium-carbon material which can be used as the grate-layer material of rotary hearth furnaces. The grate-layer material is a magnesium-carbon material, comprising waste magnesium-carbon bricks, magnesite, flake graphite, solid pitch powder, thermosetting phenol resin, titanium nitride, titanium carbide (or tungsten carbide or boron carbide), alumina micro powder (or magnalium alloy powder), silicon powder and the like. In the direct reduction process of rotary hearth furnaces, pellets containing carbon are directly and evenly laid on the grate-layer material, reduced for 12-25 minutes at the temperature between 1250 and 1400 DEG C and discharged from the rotary hearth furnace. Light-calcined dolomite is usually adopted as the grate-layer material of rotary hearth furnaces. However, when the grate-layer material is sintered and adhered to the pellets to elevate the furnace bottom, a discharging process is seriously damaged. Adopting the magnesium-carbon material as the grate-layer material of rotary hearth furnaces can prevent elevation of the furnace bottom caused by adhesion of the pellet powder and the grate-layer material when the pellets crack at the temperature between 1250 and 1400 DEG C. In addition, agglomeration of the grate-layer material and metallized pellets at the high temperature between 1250 and 1400 DEG C is eliminated.
Description
Technical field
The present invention relates to the rotary hearth furnace is reduction apparatus; Adopt smart powder of raw material such as iron or dust such as iron content, zinc to produce metallized pellet (or dri); And coloured industry is when adopting vanadium titano-magnetite, red soil nickel ore etc. to produce metallized pellet; The preparation method of rotary hearth furnace grate-layer material belongs to the exotic materials preparation field.
Background technology
It is nearest three processing Iron And Steel Plant zinc-containing dust that grows up during the decade and the novel procesies of handling special nonferrous metallic ores that the direct reduction technique of rotary hearth furnace is produced metallized pellet.This technological process is the furnace bottom that carbonaceous pelletizing evenly is laid in rotary hearth furnace, and pelletizing is accomplished the reduction back and adopted spiral discharging machine that pelletizing is discharged rotary hearth furnace in stove, so the grate-layer material Material Selection is a significant element that influences rotary hearth furnace steady running.
Usually the rotary hearth furnace furnace bottom adopts light dolomite as grate-layer material, but is difficult to satisfy processing requirement in the production process, and is not enough below existing:
(1) rhombspar at high temperature reacts with metallized pellet generation scorification; Produce the bonding phenomenon, when the green pellets generation that gets into rotary hearth furnace small-particle broken or that do not screened out by sieve got into rotary hearth furnace, less pelletizing particle will and be bonded in furnace bottom with the reaction of rhombspar generation scorification; And the metallized pellet after most of reduction this moment is discharged rotary hearth furnace through spiral discharging machine; This part broken biscuit metal pellet is bonded on the furnace bottom and can not be discharged rotary hearth furnace by spiral discharging machine, but rotary hearth furnace is continuously to produce, and this just makes the furnace bottom of rotary hearth furnace because continuous bonding small-particle; And raising in layer finally causes discharging machine discharging difficulty.This moment, rotary hearth furnace needed stop production to overhaul, cut the operating requirement that low furnace bottom satisfies spiral discharging machine;
(2) need overhaul after rotary hearth furnace operation for some time, during large-scale maintenance the repair time longer, possible producer bore temperature drops to the situation of normal temperature, moisture absorption phenomenon can take place in furnace bottom grate-layer material employing this moment rhombspar, causes the rhombspar efflorescence to produce a large amount of powder.Because rhombspar powder proportion is lighter after the efflorescence; Rotary hearth furnace a large amount of rhombspar powder from new firing up process are blown afloat by hot waste gas in the stove; Powder gets into rotary hearth furnace waste heat system with waste gas, thereby causes devices such as waste heat boiler or interchanger that bonding latch up phenomenon takes place.
Summary of the invention
The objective of the invention is to a kind of magnesium carbonaceous grate-layer material and preparation method thereof; This method can satisfy the rotary hearth furnace different process; As handle Iron And Steel Plant and handle zinc-containing dust or adopt the smart powder of iron to produce metallized pellet (or dri), and coloured industry adopts vanadium titano-magnetite, red soil nickel ore etc. to produce metallized pellet.Adopt this kind magnesium blacking as the rotary hearth furnace grate-layer material, can finely tune, thereby realize that the rotary hearth furnace grate-layer material adapts to the plurality of raw materials condition, and overcome grate-layer material bonding raw material and powder phenomenon-tion the grate-layer material composition.
Another object of the present invention is to provide the purposes of said magnesium carbonaceous grate-layer material.
The present invention realizes through following technical scheme:
The grate-layer material of a kind of magnesium carbonaceous is by the grate-layer material raw material with join additive outward and form; It is characterized in that: the weight of joining additive outward is 1.5%～4%. of grate-layer material raw material gross weight, and the grate-layer material raw materials by weight data of employing are following, add up to 100%:
Discarded magnesia carbon brick 75%～85%;
Magnesia 4%～9%;
Greying pitch 6%～9%;
Molasses 2%～4%;
Phenolic resin binder 2%～3%.
Discarded magnesia carbon brick size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～2mm, and 2～3mm, 3～5mm is respectively 10%～13%, and 14%～17%, 22%～30%, 40%～54%;
Magnesia size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～1mm, and 1～3mm is respectively 20%～25%, and 40%～50%, 30%～35%.
Waste material under changing when said discarded magnesia carbon brick is generally selected electric furnace or converter maintenance for use, its component content is: 82%～87% MgO, 5%～9% C, 2%～3%SiO
2, 2%～3% CaO, 4%～5% Al
2O
3,＜1% Fe
2O
3
Said molasses is in the industrial sugaring process, and is remaining uncrystallizable behind the crystallization of sucrose, but still contains the liquid residue than polysaccharide, and its component content is: sugar degree greater than～42%, the hammer degree is more than 65%.
With above-mentioned grate-layer material raw material is 100%; Joining additive 1.5%～4%. outward is being on the basis to prepare raw material 100% material; Join additive outward and should select any of following three kinds of proportion schemes separately for use, in order to the adjustment material performance to be applicable to the rotary hearth furnace of different technology conditions.
Join additive outward and be selected from following a kind of or its combination:
(1) joins additive outside and can select 1% Al
2O
3Super-fine powder and 1.5%～3% magnalium fine powder (150 orders～300 orders) be as inhibitor, to strengthen grate-layer material weak oxide atmosphere in the oxidation of opposing pelletizing surface, rotary hearth furnace high-temperature zone ferriferous oxide and stove, gains in strength;
(2) the outer additive of joining can be selected 1.5%～2% metallic silicon power and 1%～1.5% carborundum powder, enhancing high temperature use properties;
(3) join additive outside and can select 1.5%～2.5% titanium nitride, reduce the adhesion between interior hot metal pellet of rotary hearth furnace and the grate-layer material.
Said with raw material magnesia granularity smaller or equal to 3mm; Greying bituminous fixed carbon content＞75%, softening temperature＞250 ℃;
Contain a large amount of carbon elements in the grate-layer material of magnesium carbonaceous, carbon content is 20%～32%, and the form of carbon element is graphite and sooty mixture.
The present invention also provides the described preparation method who is applicable to the magnesium carbonaceous grate-layer material of rotary hearth furnace; It is characterized in that the depleted magnesia carbon brick need pass through following processing: with removing the contained impurity of depleted magnesia carbon brick after the fragmentation of depleted magnesia carbon brick, the magnetic separation; Then the waste gas magnesia carbon brick of chunky shape is put into the acid proof container; Spray into weakly acidic water solution, left standstill 6～8 hours, the water vapour that feeds again more than 110 ℃ is not less than 2 hours; With 750 ℃～850 ℃ bakings of the waste magnesia carbon brick high temperature after the efflorescence 4～6 hours, remove crystal water at last, obtain to reach the useless magnesium carbon raw material that batching requires.
Said impurity is contained residual steel, slag of depleted magnesia carbon brick.
Said rotary hearth furnace magnesium carbonaceous grate-layer material preparation process is following:
(1) greying bituminous preparation: get pitch and be placed in the autoclave; The reaction kettle pressure-controlling is at 0.3～0.5MPa, and temperature is incubated 3～4 hours at 400～440 ℃; In producing greying pitch process, emit the cut of generation through pressure release valve; Insulation finishes the back, and slowly pressure release is to normal pressure, and simultaneous temperature is controlled at 350～400 ℃, after distillation is accomplished in the equipment leftover materials be greying pitch;
(2) with removal of contamination after the fragmentation of depleted magnesia carbon brick, the magnetic separation, then the discarded magnesia carbon brick of chunky shape is put into the acid proof container, spray into weakly acidic water solution, left standstill 6～8 hours, the water vapour that feeds again more than 110 ℃ is not less than 2 hours; With 750 ℃～850 ℃ bakings of the waste magnesia carbon brick high temperature after the efflorescence 4～6 hours, remove crystal water, the discarded magnesia carbon brick after obtaining handling at last;
(3) according to proportioning raw materials, with the discarded magnesia carbon brick after the said processing, magnesia; Molasses; Phenolic resin binder, greying pitch adds in the mixing machine successively, and mixing time is controlled at 15～25min; Mix the back and discharge compound, then the mixing material is put into briquetting press and be made into axiolitic green-ball (long 30mm, wide 20mm and high 15mm);
(4) at last the green-ball of moulding is put into kiln and toast for 150 ℃～400 ℃, storing time is 20～30 hours, obtains the grate-layer material of rotary hearth furnace magnesium carbonaceous.
Step 2) said impurity is contained residual steel, slag of depleted magnesia carbon brick.
Described weakly acidic water solution generally is that the pH value is 5～7 the aqueous solution, and the common aqueous solution shows slightly acidic has weak acid (carbonic acid, hypochlorous acid, hydrogen sulfide etc.), strong acid weak base salt (ammonium chloride, cupric chloride etc.).Those skilled in the art can select suitable weakly acidic water solution according to common practise.
The present invention also provides the purposes of said magnesium carbonaceous grate-layer material, it is characterized in that being used for rotary hearth furnace.
Magnesium blacking of the present invention is used for the rotary hearth furnace grate-layer material, not only adapts to the plurality of raw materials condition, and has overcome grate-layer material bonding raw material and powder phenomenon-tion.
Embodiment
Following examples are to further specify of the present invention.But the present invention is not limited thereto.
As not having specified otherwise, the percentage composition among the embodiment is weight percentage.
Embodiment 1
(1) (1) greying bituminous preparation: get an amount of pitch and be placed in the autoclave; The reaction kettle pressure-controlling is at 0.4MPa, and temperature is incubated 3.5 hours at 415 ℃; In producing greying pitch process, emit the cut of generation through pressure release valve; Insulation finishes the back, and slowly pressure release is to normal pressure, and simultaneous temperature is controlled at 360 ℃, after distillation is accomplished in the equipment leftover materials be greying pitch;
(2) with removing impurity such as the contained residual steel of depleted magnesia carbon brick, slag after the fragmentation of depleted magnesia carbon brick, the magnetic separation; Then the waste gas magnesia carbon brick of chunky shape is put into the acid proof container; Spray into weakly acidic water solution, left standstill 6 hours, feed 120 ℃ water vapour 2.5 hours again; With 780 ℃ of bakings of the waste magnesia carbon brick high temperature after the efflorescence 6 hours, remove crystal water at last, obtain to reach the useless magnesium carbon raw material that batching requires.
(3) with the discarded magnesia carbon brick (77.5%) after the said processing, magnesia (7%), molasses (4%); Phenolic resin binder (3%); Greying pitch (8.5%) is sequentially added in the mixing machine, joins the metallic silicon power of additive 1.5% and 1.3% carborundum powder outward, and mixing time is controlled at 15min; Mix the back and discharge compound, then the mixing material is put into briquetting press (300 tons of pressure) and be made into axiolitic green-ball (long 30mm, wide 20mm and high 15mm);
(4) at last the green-ball of moulding is put into kiln and toast for 280 ℃, storing time is 25 hours, obtains the grate-layer material of rotary hearth furnace magnesium carbonaceous.
Discarded magnesia carbon brick size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～2mm, and 2～3mm, 3～5mm is respectively 10%, 17%, and 30%, 43%;
Magnesia size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～1mm, and 1～3mm is respectively 20%, 50%, and 30%.
The physicals of the magnesium carbonaceous grate-layer material that obtains is: bulk density is 1.71g/cm
3, volume density is 2.79g/cm
3, void content is 3.05%, compressive strength 53Mpa.
The magnesium carbonaceous grate-layer material that is obtained goes for handling Iron And Steel Plant and handles zinc-containing dust or adopt the smart powder of iron to produce metallized pellet, and coloured industry adopts vanadium titano-magnetite, red soil nickel ore etc. to produce metallized pellet.
Embodiment 2
Other are with embodiment 1.Difference is: it is 2% metallic silicon power and 1.5% carborundum powder that step 3) is joined additive at home and abroad.
Discarded magnesia carbon brick size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～2mm, and 2～3mm, 3～5mm is respectively 13%, 14%, and 22%, 51%;
Magnesia size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～1mm, and 1～3mm is respectively 25%, 40%, and 35%.
Embodiment 3
Other are with embodiment 1.Difference is: it is 1.7% metallic silicon power and 1% carborundum powder that step 3) is joined additive at home and abroad.
Discarded magnesia carbon brick size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～2mm, and 2～3mm, 3～5mm is respectively 11%, 15%, and 27%, 47%;
Magnesia size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～1mm, and 1～3mm is respectively 22%, 45%, and 33%.
Embodiment 4
Other are with embodiment 1.Difference is: it is 1% Al that step 3) is joined additive at home and abroad
2O
3Super-fine powder and 3% magnalium fine powder.
Embodiment 5
Other are with embodiment 1.Difference is: discarded magnesia carbon brick (85%) in the step 3), and magnesia (4%), molasses (3%), phenolic resin binder (2%), greying pitch (6%) is sequentially added in the mixing machine, joins additive outward and be 1% Al
2O
3Super-fine powder and 1.5% magnalium fine powder.
Embodiment 6
(1) greying bituminous preparation: get an amount of pitch and be placed in the autoclave; The reaction kettle pressure-controlling is at 0.4MPa, and temperature is incubated 3.4 hours at 430 ℃; In producing greying pitch process, emit the cut of generation through pressure release valve; Insulation finishes the back, and slowly pressure release is to normal pressure, and simultaneous temperature is controlled at 400 ℃, after distillation is accomplished in the equipment leftover materials be greying pitch;
(2) with removing impurity such as the contained residual steel of depleted magnesia carbon brick, slag after the fragmentation of depleted magnesia carbon brick, the magnetic separation; Then the waste gas magnesia carbon brick of chunky shape is put into the acid proof container; Spray into weakly acidic water solution, left standstill 8 hours, feed 130 ℃ water vapour 3 hours again; With 850 ℃ of bakings of the waste magnesia carbon brick high temperature after the efflorescence 5 hours, remove crystal water at last, obtain to reach the useless magnesium carbon raw material that batching requires.
(3) with the discarded magnesia carbon brick (81%) after the said processing, magnesia (9%), molasses (2%); Phenolic resin binder (2%); Greying pitch (6%) is sequentially added in the mixing machine, joins carborundum powder, 2.5% titanium nitride and 1.5% the metallic silicon power of additive 1.5% outward, and mixing time is controlled at 25min; Mix the back and discharge compound, then the mixing material is put into briquetting press (600 tons of pressure) and be made into straight brick bulk (long 500mm, wide 30mm and high 150mm);
(4) at last the living fragment of brick of moulding is put into kiln and toast for 380 ℃, storing time is 30 hours, obtains the grate-layer material of rotary hearth furnace magnesium carbonaceous.
The physicals of the magnesium carbonaceous grate-layer material that obtains is: volume density is 3.10g/cm
3, void content is 2.83%, compressive strength 70Mpa.
The magnesium carbonaceous grate-layer material that is obtained goes for adopting the smart powder of iron, vanadium titano-magnetite, red soil nickel ore etc. to produce pearl iron.
Embodiment 7
Other are with embodiment 6.Difference is: it is 2% titanium nitride that step 3) is joined additive at home and abroad.
Embodiment 8
Other are with embodiment 7.Difference is: it is 1.5% titanium nitride, 1% Al that step 3) is joined additive at home and abroad
2O
3Super-fine powder and 1.5% magnalium fine powder (150 orders～300 orders).
Claims (10)
1. magnesium carbonaceous grate-layer material is by the grate-layer material raw material with join additive outward and form; It is characterized in that: the weight of joining additive outward is 1.5%～4%. of grate-layer material raw material gross weight, and the grate-layer material raw materials by weight data of employing are following, add up to 100%:
Discarded magnesia carbon brick 75%～85%;
Magnesia 4%～9%;
Greying pitch 6%～9%;
Molasses 2%～4%;
Phenolic resin binder 2%～3%.
2. magnesium carbonaceous as claimed in claim 1 grate-layer material is characterized in that: discarded magnesia carbon brick size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～2mm; 2～3mm, 3～5mm is respectively 10%～13%, and 14%～17%; 22%～30%, 40%～54%.
3. magnesium carbonaceous as claimed in claim 1 grate-layer material is characterized in that: magnesia size composition is: grain size intervals is respectively less than 200 purpose fine powders, 200 orders～1mm, and 1～3mm is respectively 20%～25%, and 40%～50%, 30%～35%.
4. magnesium carbonaceous as claimed in claim 1 grate-layer material is characterized in that: said discarded magnesia carbon brick, its component content is: 82%～87% MgO, 5%～9% C, 2%～3%SiO
2, 2%～3% CaO, 4%～5% Al
2O
3,＜1% Fe
2O
3
5. like each described magnesium carbonaceous grate-layer material of claim 1～4, it is characterized in that: join additive outward and be selected from following a kind of or its combination:
(1) the outer additive of joining is selected 1% Al
2O
3Super-fine powder and 1.5%～3% magnalium fine powder (150 orders～300 orders);
(2) the outer metallic silicon power of additive selection 1.5%～2% and 1%～1.5% the carborundum powder of joining;
(3) the outer additive of joining is selected 1.5%～2.5% titanium nitride.
6. like each described magnesium carbonaceous grate-layer material of claim 1～4, it is characterized in that: said with raw material magnesia granularity smaller or equal to 3mm; Greying bituminous fixed carbon content＞75%, softening temperature＞250 ℃;
Contain a large amount of carbon elements in the magnesium blacking, carbon content is 20%～32%, and the form of carbon element is graphite and sooty mixture.
7. like the preparation method of each described magnesium carbonaceous grate-layer material of claim 1～6; It is characterized in that the depleted magnesia carbon brick need pass through following processing: with removal of contamination after the fragmentation of depleted magnesia carbon brick, the magnetic separation; Then the waste gas magnesia carbon brick of chunky shape is put into the acid proof container; Spray into weakly acidic water solution, left standstill 6～8 hours, the water vapour that feeds again more than 110 ℃ is not less than 2 hours; With 750 ℃～850 ℃ bakings of the waste magnesia carbon brick high temperature after the efflorescence 4～6 hours, remove crystal water at last, obtain to reach the useless magnesium carbon raw material that batching requires.
8. the preparation method of magnesium carbonaceous as claimed in claim 8 grate-layer material, step is following:
(1) greying bituminous preparation: get pitch and be placed in the autoclave; The reaction kettle pressure-controlling is at 0.3～0.5MPa, and temperature is incubated 3～4 hours at 400～440 ℃; In producing greying pitch process, emit the cut of generation through pressure release valve; Insulation finishes the back, and slowly pressure release is to normal pressure, and simultaneous temperature is controlled at 350～400 ℃, after distillation is accomplished in the equipment leftover materials be greying pitch;
(2) with removal of contamination after the fragmentation of depleted magnesia carbon brick, the magnetic separation, then the discarded magnesia carbon brick of chunky shape is put into the acid proof container, spray into weakly acidic water solution, left standstill 6～8 hours, the water vapour that feeds again more than 110 ℃ is not less than 2 hours; With 750 ℃～850 ℃ bakings of the waste magnesia carbon brick high temperature after the efflorescence 4～6 hours, remove crystal water, the discarded magnesia carbon brick after obtaining handling at last;
(3) according to proportioning raw materials, with the discarded magnesia carbon brick after the said processing, magnesia; Molasses; Phenolic resin binder, greying pitch adds in the mixing machine successively, and mixing time is controlled at 15～25min; Mix the back and discharge compound, then the mixing material is put into briquetting press and be made into axiolitic green-ball;
(4) at last the green-ball of moulding is put into kiln and toast for 150 ℃～400 ℃, storing time is 20～30 hours, obtains the grate-layer material of rotary hearth furnace magnesium carbonaceous.
9. like the preparation method of claim 7 or 8 described magnesium carbonaceous grate-layer materials, it is characterized in that the step 2 of claim 7 and claim 8) said impurity is contained residual steel, slag of depleted magnesia carbon brick.
10. like the purposes of each said magnesium carbonaceous grate-layer material of claim 1-6, it is characterized in that being used for rotary hearth furnace.
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