CN100590098C - Environment-protection dry type vibrating material and production method thereof - Google Patents

Environment-protection dry type vibrating material and production method thereof Download PDF

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Publication number
CN100590098C
CN100590098C CN200710170495A CN200710170495A CN100590098C CN 100590098 C CN100590098 C CN 100590098C CN 200710170495 A CN200710170495 A CN 200710170495A CN 200710170495 A CN200710170495 A CN 200710170495A CN 100590098 C CN100590098 C CN 100590098C
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powder
mass percent
carbon brick
magnesia carbon
granularity
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CN200710170495A
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Chinese (zh)
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CN101219902A (en
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徐宏武
于琪芳
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攀枝花顺腾集团冶金材料有限公司
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Abstract

The invention relates to a dry vibration material of environmental protection type and a preparation method thereof, which are characterized in that the vibration material of intermediate dry type isgrain composition formed by manually cleaning and crushing waste magnesia-carbon bricks, waste aluminium-magnesia carbon or the mixture thereof in steelmaking plants. Inorganic silicate is selected asadhesive; metal Al powders, Si powders and SiC powders are added as compound anti-oxidant; borax and silicon powders are selected as medium-temperature agglutinant. The dry vibration material prepared banishes the conventional phenolic resin as adhesive, and meets the requirement of environmental protection. The service life is prolonged from 12 hours to over 20 hours; the dry vibration materialis the material of intermediate dry type with strong practicality, easy preparation and rich material.

Description

Environment-protection dry type vibrating material and preparation method thereof
Technical field
The present invention relates to a kind of environment-protection dry type vibrating material and preparation method thereof.Be mainly used in one of major equipment of continuous casting process in the modern steel-smelting technology: the working lining of tundish, and on other Metal Melting furnace and the relevant Thermal Equipment.Belong to the amorphous refractory field.
Background technology
Tundish dry vibratory material is the unshape refractory of developing in the world in recent years, and need not add any water or other liquid during its construction can just can obtain fine and close construction body and need not the material that maintenance just can be used through vibration.Because it is compared with traditional mould material, have advantages such as making is simple, the engineering time is short, labour intensity is low, easy to use, thereby promoted rapidly in recent years.
At present, it is raw material that tundish dry vibratory material generally adopts electrosmelted magnesite clinker, electric molten magnesite powder, and cost is higher relatively.And cracked by thermal shocking under the shortcoming owing to magnesia material itself---the high temperature, make product in use structural peeling off occur and damage, slag is invaded working lining inside by crackle and is caused the erosion melting loss.Reduced the work-ing life of product.
The use of wedding agent has determined the developmental level of amorphous refractory to a certain extent.Existing tundish dry vibratory material is widely used to be powdery thermoplastic resol.The characteristic that this class wedding agent low temperature dissolves make material in, low temperature obtained good intensity, satisfied the service requirements of dry-type vibration material.But use resol to make wedding agent, price is high on the one hand, has improved the cost of product; The medium temperature intensity of product is low on the other hand, is prone to the danger of the bag that collapses when middle temperature baking is wrapped.And the accelerator for hardening hexamethylenetetramine decomposes that matches, the gas of generation have strong foul odour, stimulate respiratory tract and eyes, influence healthy, aggravating working environment.Seek not only environmentally safe but also can improve the wedding agent of product medium temperature intensity, become inevitable.
A kind of as the amorphous refractory additive, the adding of oxidation inhibitor significantly improves refractory materials resistance of oxidation at high temperature, has stoped the chemical reaction of oxide compound to refractory materials effectively, reduces deteriorating of refractory materials.
In today that modern steel-making continuous casting Technology is advanced by leaps and bounds, research and develop not only environmental protection, but also energy-conservation and novel efficiently dry-type vibration material, become one of important problem of material Application Areas.
Summary of the invention
Technical problem to be solved by this invention is: a kind of cleaning, energy-conservation, environment-protection dry type vibrating material and preparation method thereof efficiently are provided.Singly water the ladle number and reach more than 18 heats, thereby reduce the number of turnover of tundish significantly, save time, improve casting speed, reduce refractory consumption rate, save cost.
The technical scheme that provides for technical problem to be solved is:
1, the selection of raw material: raw material sources are waste magnesia carbon brick, aluminium scrap magnesia carbon bricks of steelworks, through the artificial hand selection, reject foreign material such as the iron scale adhere on the useless brick, dross.Use the jaw crushing crusher machine, put into sand mill and stir, add chemical reagent, ageing mixture 24h, the plate vibration screen sizing is used in seasoning, and obtaining granularity is waste magnesia carbon brick sand or the aluminium scrap magnesia carbon brick sand of 5-1mm or 3-0mm, as aggregate; And waste magnesia carbon brick sand or aluminium scrap magnesia carbon brick sand are made the fine powder of granularity≤0.088mm with the Raymond mill milling method, as the powder of environment-protection dry type vibrating material.
2, the selection of wedding agent: the inorganic silicate of selecting granularity≤0.1mm for use is a wedding agent.
3, the selection of oxidation inhibitor: preferentially select for use metal A l, metal Si, SiC as compound antioxidizer, its granularity is suitable with above-described fine powder.
4, the selection of intermediate sintering temperature agent: selecting borax, silicon powder for use is the intermediate sintering temperature agent, particle diameter≤40 μ m.
5, the mass percent of the concrete raw material of three kinds of environment-protection dry type vibrating materials provided by the invention is:
(1)
Waste magnesia carbon brick sand 60%-80%
Waste magnesia carbon brick powder 40%-20%
Metal A l powder (adding) 0.5%-3%
Metal Si powder (adding) 0.5%-4%
SiC powder (adding) 1%-5%
α-Al 2O 3Powder (adding) 0.5%-2%
Borax (adding) 0.5%-3%
Silicon powder (adding) 0.1%-3%
Inorganic salt wedding agent (adding) 3%-6%
(2)
Aluminium scrap magnesia carbon brick sand 60%-80%
Aluminium scrap magnesia carbon brick powder 40%-20%
Metal A l powder (adding) 0.5%-3%
Metal Si powder (adding) 0.5%-4%
SiC powder (adding) 1%-5%
α-Al 2O 3Powder (adding) 0.5%-2%
Borax (adding) 0.5%-3%
Silicon powder (adding) 0.1%-3%
Inorganic salt wedding agent (adding) 3%-6%
(3)
Aluminium scrap magnesia carbon brick sand 5%-70%
Waste magnesia carbon brick sand 5%-70%
Aluminium scrap magnesia carbon brick powder 5%-50%
Waste magnesia carbon brick powder 5%-50%
Metal A l powder (adding) 0.5%-3%
Metal Si powder (adding) 0.5%-4%
SiC powder (adding) 1%-5%
α-Al 2O 3Powder (adding) 0.5%-2%
Borax (adding) 0.5%-3%
Silicon powder (adding) 0.1%-3%
Inorganic salt wedding agent (adding) 3%-6%
With respect to above-mentioned three kinds of proportioning raw materials then the concrete chemical ingredients mass percent of environment-protection dry type vibrating material provided by the invention be respectively:
(1) MgO 60%-85% (2) MgO surplus (3) MgO 50%-80%
CaO?1%-4% CaO?1%-4% CaO 1%-4%
Al 2O 3Surplus Al 2O 360%-85%Al 2O 3Surplus
Al 0.8%-3% Al 0.8%-3% Al 0.8%-3%
SiO 2?1%-5% SiO 2?1%-5% SiO 2?1%-5%
SiC 1%-5% SiC 1%-5% SiC 1%-5%
C 6%-25% C 6%-25% C 6%-25%
The concrete manufacture craft of environment-protection dry type vibrating material provided by the invention is: a) by any forms the proportioning weighing in three kinds of components of claim 1; B) waste magnesia carbon brick sand or aluminium scrap magnesia carbon brick sand are made fine powder with Raymond mill, put in the small-sized mixer with the extraneous component except that inorganic salt adhesive and mix 15-20min; C) will prepare burden form in coarse particles and wedding agent put into planetary machine,massing premix 3-8 minute, sneak into the fine powder of step b) mixing again, discharging in mixing more at last 10-20 minute, inspection by sampling, weighing, packing, warehouse-in.
By above technical scheme as can be seen: the characteristics of environment-protection dry type vibrating material provided by the invention are: (1) most of raw material system utilizes discarded magnesia carbon brick or discarded Al2O3MgOC Bricks, turns waste into wealth, and has saved valuable magnesia;
(2) simultaneously, the present invention has increased the percentage composition (6-25%) of carbon, makes full use of carbon and has fusing point height (3400 ℃ of graphite fusing points), is difficult to by slag moistening; The thermal conductivity height is difficult to be subjected to thermal shocking and cracks and can reduce Fe 2O 3And SiO 2Advantage Deng exotic, by carbon and MgO is compound that the oxidation of carbon is inhibited, brought into play the high temperature corrosion resistance of MgO to greatest extent, overcome the shortcoming of magnesia simultaneously---owing to thermal shocking cracks, owing to the intrusion of exotic produces structure spalling.The present invention combine these two kinds of materials separately advantage and overcome the two shortcoming, thereby given play to premium properties.That is to say that the present invention has overcome the shortcoming of alkaline dry vibration material in the past fully, i.e. the fatal problem of slag action and generation crackle;
(3) creatively use nontoxic, tasteless, as not produce obnoxious flavour inorganic salt wedding agent.Because this wedding agent low-temperature heat makes it dehydration and forms gelation, is deposited on waste magnesia carbon brick sand and the aluminium scrap magnesia carbon brick sand and their the fine powder surface of refractory aggregate, make it glued, harden and obtain intensity, give material good use properties.And moulding preferably and workability arranged.Compare with phenolic resin binder, it have cheap, low temperature and medium temperature intensity height, pollution-free, do not influence the slag resistance of dry-type vibration material and the characteristics of oxidation-resistance again.Improve operating environment, reach the purpose of cleaner production;
(4) introduced compound antioxidizer.The present invention fully takes into account the characteristic that carbon containing refractory is easy to oxidation, utilizes metal A l, metal Si and compound S iC than the easier oxidation of carbon.In the compound adding dry type material, one of its purpose is in order to prevent combined carbon and graphite preferentially with after the oxygen in the atmosphere or the ferric oxide generation chemical reaction in the slag and produce oxidation, the 2nd, and in order to improve the hot strength of dry type material.The dry type material is when being heated, oxidation inhibitor can cause the more tiny pore of material production, thereby reduce the ventilation property of material, make air more be difficult to enter in the structure of material, can also reduce simultaneously the void content of material, rely on these mechanism, oxidation inhibitor just gives material stability to a certain degree when air is arranged; In hot environment, the metal oxide that generates during burning has been filled the pore that oxidation of coal forms, and makes the refractory materials densification, and CO is reduced to C, suppresses the spending rate of C, thereby has improved the hot strength of material, has played the effect that prevents oxidation of coal;
(5) medium and high temperature strength of material has been strengthened in the use of boric acid.Rising B with temperature 2O 3With the Al in the base-material 2O 3Or MgO generation solid-liquid reaction, the dry type material is played initial agglomerating effect, thereby can improve the medium and high temperature strength of dry type material more significantly;
(6) production technique is easy, easy handling, and facility investment is few, and good cost performance is arranged.
Embodiment
Further illustrate substantive distinguishing features of the present invention and obvious improvement below by specific embodiment.
Embodiment 1
The quality percentage composition of each chemical ingredients of environment-protection dry type vibrating material provided by the invention is: MgO70.20%, CaO 2.14%, Al 2O 33.28%, C 15.30%, SiO 23.31%, SiC1.73%, Fe 2O 31.81%.
The concrete proportioning (weight percent) of each raw material is: granularity is a 5-1mm waste magnesia carbon brick sand 55%, granularity 3-0mm waste magnesia carbon brick sand 20%, granularity≤0.088mm waste magnesia carbon brick powder 25%, metal A l powder (adding) 1.2%, metal Si powder (adding) 1.0%, SiC powder (adding) 2%, α-Al 2O 3Powder (adding) 0.5%, borax (adding) 1.8%, silicon powder (adding) 0.2%, inorganic salt wedding agent (adding) 3.8%.
By above weight percent weighing, then fine powder is put into mix 15min in the small-sized mixer after, the pouch of packing into is standby.Earlier coarse particles and wedding agent are put into planetary machine,massing premix 4min, add the fine powder thorough mixing of mixing again, total mixing time is discharging after the 15min, weighing and bagging, inspection by sampling.
Embodiment 2
The quality percentage composition of each chemical ingredients of environment-protection dry type vibrating material provided by the invention is: MgO5.33%, CaO 2.18%, Al 2O 371.24%, C 12.54%, SiO 23.60%, SiC1.80%, Fe 2O 31.31%.
The concrete proportioning (weight percent) of each raw material is: granularity is a 5-1mm aluminium scrap magnesium carbon granule 63%, granularity 3-0mm aluminium scrap magnesia carbon brick sand 12%, granularity≤0.088mm aluminium scrap magnesia carbon brick powder 25%, metal A l powder (adding) 1.0%, metal Si powder (adding) 0.8%, 94SiC powder (adding) 2.0%, α-Al 2O 3Powder (adding) 0.5%, borax (adding) 2.2%, silicon powder (adding) 0.2%.Inorganic salt wedding agent (adding) 3.5%.Described 94SiC is that SiC content is 94% SiC material abbreviation.
By above weight percent weighing, then fine powder is put into mix 20min in the small-sized mixer after, the pouch of packing into is standby.Earlier coarse particles and wedding agent are put into planetary machine,massing premix 2min, add the fine powder thorough mixing of mixing again, total mixing time is discharging after the 15min, weighing and bagging, inspection by sampling.
Embodiment 3
The quality percentage composition of each chemical ingredients of environment-protection dry type vibrating material provided by the invention is: MgO56.00%, CaO 2.04%, Al 2O 325.33%, C 8.72%, SiO 22.78%, SiC1.39%, Fe 2O 31.74%.
The concrete proportioning (weight percent) of each raw material is: granularity is a 5-1mm aluminium scrap magnesia carbon brick sand 12%, particle diameter is the waste magnesia carbon brick sand 20% of 5-1mm, granularity 3-0mm aluminium scrap magnesia carbon brick sand 17%, granularity are the useless magnesium carbon granule 26% of 3-0mm, granularity≤0.088mm, aluminium scrap magnesia carbon brick powder 10%, waste magnesia carbon brick powder 15%, metal A l powder (adding) 1.0%, metal Si powder (adding) 0.8%, 94SiC powder (adding) 2.0%, α-Al 2O 3Powder (adding) 0.5%, borax (adding) 2.2%, silicon powder (adding) 0.2%.Inorganic salt wedding agent (adding) 3.5%.
By above weight percent weighing, then fine powder is put into mix 18min in the small-sized mixer after, the pouch of packing into is standby.Earlier coarse particles and wedding agent are put into planetary machine,massing premix 4min, add the fine powder thorough mixing of mixing again, total mixing time is discharging after the 20min, weighing and bagging, inspection by sampling.
Contrast as following table with its performance of use and resin-bonded dry-type vibration material after testing:
Comparative example be climb that steel uses with the embodiment 1 component resin-bonded dry-type vibration material that is close.
Use and economic benefit
(1) produces 4 tons of environment-protection dry type vibrating materials according to embodiment 1, climbing on No. 2 square billet tundish in steel continuous casting workshop on August 17th, 2007 and using.7 hours 24 minutes working hour, water steel altogether 19 times.After the use, the working lining corroding thickness is 1.1mm, turns over to contain easily.
(2) produce 4 tons of environment-protection dry type vibrating materials according to embodiment 2, climbing on No. 2 square billet tundish in steel continuous casting workshop on September 1st, 2007 and using.7 hours 50 minutes working hour, water steel altogether 18 times.After the use, the working lining corroding thickness is 0.8mm only, turns over to contain easily.
(3) produce 4 tons of environment-protection dry type vibrating materials according to embodiment 3, use climbing on No. 2 square billet tundish in steel continuous casting workshop.Working hour 20h waters steel 27 times altogether.After the use, the working lining corroding thickness is 0.9mm only, turns over to contain easily.
By practical probation, reached expected effect of the present invention.Facts have proved that environment-protection dry type vibrating material of the present invention than the longer service life of domestic resol in conjunction with dry-type vibration material, can reach service requirements fully, result of use is good.
The recovery of waste magnesia carbon brick, aluminium scrap magnesia carbon brick, tooling cost are 320 yuan/t, only this item, and raw materials cost can be saved 1000 yuan/t, has obtained good economic benefit and social benefit.Have broad application prospects.

Claims (10)

1, a kind of environment-protection dry type vibrating material is characterized in that described vibration material consists of any in following three kinds of compositions:
(1)
The mass percent of waste magnesia carbon brick sand is 60%-80%
The mass percent of waste magnesia carbon brick powder is 40%-20%
The mass percent of added metal Al powder is 0.5%-3%
The mass percent of added metal Si powder is 0.5%-4%
The mass percent that adds the SiC powder is 1%-5%
Add α-Al 2O 3The mass percent of powder is 0.5%-2%
The mass percent that adds borax is 0.5%-3%
The mass percent that adds silicon powder is 0.1%-3%
The mass percent that adds the inorganic silicate wedding agent is 3%-6%;
(2)
The mass percent of aluminium scrap magnesia carbon brick sand is 60%-80%,
The mass percent of aluminium scrap magnesia carbon brick powder is 40%-20%,
The mass percent of added metal Al powder is 0.5%-3%,
The mass percent of added metal Si powder is 0.5%-4%,
The mass percent that adds the SiC powder is 1%-5%,
Add α-Al 2O 3The mass percent of powder is 0.5%-2%,
The mass percent that adds borax is 0.5%-3%,
The mass percent that adds silicon powder is 0.1%-3%,
The mass percent that adds the inorganic silicate wedding agent is 3%-6%;
(3)
The mass percent of aluminium scrap magnesia carbon brick sand is 5%-70%,
The mass percent of waste magnesia carbon brick sand is 5%-70%,
The mass percent of aluminium scrap magnesia carbon brick powder is 5%-50%,
The mass percent of waste magnesia carbon brick powder is 5%-50%,
The mass percent of added metal Al powder is 0.5%-3%,
The mass percent of added metal Si powder is 0.5%-4%,
The mass percent that adds the SiC powder is 1%-5%,
Add α-Al 2O 3The mass percent of powder is 0.5%-2%,
The mass percent that adds borax is 0.5%-3%,
The mass percent that adds silicon powder is 0.1%-3%,
The mass percent that adds the inorganic silicate wedding agent is 3%-6%.
2, by the described environment-protection dry type vibrating material of claim 1, it is characterized in that the corresponding chemical ingredients mass percent of described three kinds of components is respectively:
(1) MgO 60%-85%, (2) MgO surplus, (3) MgO 50%-80%,
CaO 1%-4%, CaO 1%-4%, CaO 1%-4%,
Al 2O 3Surplus, Al 2O 360%-85%, Al 2O 3Surplus,
Al 0.8%-3%, Al 0.8%-3%, Al 0.8%-3%,
SiO 2 1%-5%, SiO 2 1%-5%, SiO 2 1%-5%,
SiC 1%-5%, SiC 1%-5%, SiC 1%-5%,
C 6%-25%; C 6%-25%; C 6%-25%。
3, by the described environment-protection dry type vibrating material of claim 1, it is characterized in that described waste magnesia carbon brick sand or aluminium scrap magnesia carbon brick fineness of sand as refractory aggregate is 5-1mm or 3-0mm.
4,, it is characterized in that the granularity of described waste magnesia carbon brick powder or aluminium scrap magnesia carbon brick powder is≤0.088mm by the described environment-protection dry type vibrating material of claim 1.
5, by the described environment-protection dry type vibrating material of claim 1, it is characterized in that described inorganic salt wedding agent granularity≤0.1mm, inorganic salt are inorganic silicate.
6, by the described environment-protection dry type vibrating material of claim 5, it is characterized in that described inorganic salt wedding agent low-temperature heat dehydrating gelization, and be deposited on as refractory aggregate waste magnesia carbon brick sand or aluminium scrap magnesia carbon brick sand and their fine powder surface.
7, by each described environment-protection dry type vibrating material among the claim 1-6, it is characterized in that described dry-type vibration material consists of:
Granularity is that the mass percent of the waste magnesia carbon brick sand of 5-1mm is 55%,
Granularity is that the mass percent of the waste magnesia carbon brick sand of 3-0mm is 20%,
Granularity is 25% for the mass percent of the waste magnesia carbon brick powder of≤0.088mm,
And the metal A l powder that adds, metal Si powder, SiC powder, α-Al 2O 3The mass percent of powder, borax, silicon powder and inorganic salt adhesive is followed successively by 1.2%, 1.0%, 2%, 0.5%, 1.8%, 0.2% and 3.8%.
8, by each described environment-protection dry type vibrating material among the claim 1-6, it is characterized in that described dry-type vibration material consists of:
Granularity is that the mass percent of the aluminium scrap magnesia carbon brick sand of 5-1mm is 63%,
Granularity is that the mass percent of the aluminium scrap magnesia carbon brick sand of 3-0mm is 12%,
Granularity is 25% for the mass percent of the aluminium scrap magnesia carbon brick powder of≤0.088mm,
And the metal A l powder that adds, metal Si powder, 94SiC powder, α-Al 2O 3The mass percent of powder, borax, silicon powder and inorganic salt adhesive is followed successively by 1.0%, 0.8%, 2.0%, 0.5%, 2.2%, 0.2% and 3.5%.
9, by each described environment-protection dry type vibrating material among the claim 1-6, it is characterized in that described dry-type vibration material consists of:
Granularity is that the mass percent of the aluminium scrap magnesia carbon brick sand of 5-1mm is 12%,
Granularity is that the mass percent of the aluminium scrap magnesia carbon brick sand of 3-0mm is 17%,
Granularity is that the mass percent of the waste magnesia carbon brick sand of 5-1mm is 20%,
Granularity is that the mass percent of the waste magnesia carbon brick sand of 3-0mm is 26%,
Granularity is 10% for the mass percent of the aluminium scrap magnesia carbon brick powder of≤0.088mm,
Granularity is 15% for the mass percent of the waste magnesia carbon brick powder of≤0.088mm,
And the metal A l powder that adds, metal Si powder, 94SiC powder, α-Al 2O 3The mass percent of powder, borax, silicon powder and inorganic salt adhesive is followed successively by 1.0%, 0.8%, 2.0%, 0.5%, 2.2%, 0.2% and 3.5%.
10, the method for preparation environment-protection dry type vibrating material as claimed in claim 1 is characterized in that processing step is:
A) by any forms the proportioning weighing in three kinds of components of claim 1;
B) waste magnesia carbon brick sand or aluminium scrap magnesia carbon brick sand are made fine powder with Raymond mill, put in the small-sized mixer with the extraneous component except that inorganic salt adhesive and mix 15-20min;
C) will prepare burden form in coarse particles and wedding agent put into planetary machine,massing premix 3-8 minute, sneak into the fine powder of step b) mixing again, discharging in mixing more at last 10-20 minute, packing.
CN200710170495A 2007-11-16 2007-11-16 Environment-protection dry type vibrating material and production method thereof CN100590098C (en)

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CN101962300A (en) * 2010-08-25 2011-02-02 湖南湘钢宜兴耐火材料有限公司 Regeneration method of steelmaking carbonic crushed brick
CN102010215A (en) * 2010-12-17 2011-04-13 武汉科技大学 Tundish dry type vibration material taking waste magnesia carbon bricks as raw materials and preparation method thereof
CN102167603A (en) * 2010-12-28 2011-08-31 攀枝花钢城集团有限公司 Additive for pouring box dry vibrating material and preparation method and application thereof
CN102718506A (en) * 2011-03-31 2012-10-10 上海宝钢工业检测公司 Refractory composition for pure hydrogen atmosphere high temperature furnace
CN102910924B (en) * 2012-11-19 2014-01-15 长兴攀江冶金材料有限公司 Dry material using waste magnesia carbon brick as main raw material and preparation method of dry material
CN103482988B (en) * 2013-08-22 2014-12-03 长兴攀江冶金材料有限公司 Preparation method of baking-free magnesium vibration material
CN103467113B (en) * 2013-08-22 2014-08-20 长兴攀江冶金材料有限公司 Baking-free magnesian vibration material
CN103601512B (en) * 2013-11-18 2015-05-20 河南海格尔高温材料有限公司 Ladle edge castable containing alumina magnesia carbon brick slag
CN104084574B (en) * 2014-07-14 2016-08-24 浙江铭德新材科技有限公司 A kind of environment-friendly type liner in dundish and forming method thereof
CN104402472A (en) * 2014-11-26 2015-03-11 攀枝花钢城集团有限公司 Tundish dry vibrating refractory and preparation method, as well as special additive and preparation method
CN107188580A (en) * 2017-06-28 2017-09-22 常州万博金属构件厂 A kind of vibration material and preparation method thereof
CN110256050A (en) * 2019-07-05 2019-09-20 中钢集团洛阳耐火材料研究院有限公司 A kind of pyrolytic semlting magnesium carbonaceous artesian repairing material

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