CN104261845A - Method for preparing dolomite carbon brick - Google Patents

Method for preparing dolomite carbon brick Download PDF

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Publication number
CN104261845A
CN104261845A CN201410480471.7A CN201410480471A CN104261845A CN 104261845 A CN104261845 A CN 104261845A CN 201410480471 A CN201410480471 A CN 201410480471A CN 104261845 A CN104261845 A CN 104261845A
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dolomite
cao
granularity
carbon brick
rhombspar
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CN201410480471.7A
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CN104261845B (en
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曹大力
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Shenyang University of Chemical Technology
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Shenyang University of Chemical Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention relates to a method for preparing a dolomite carbon brick. According to the method, electrically fused magnesite of which the particle size is 5-8mm and high-calcium magnesite of which the particle sizes are 5-3mm, 3-1mm, 1-0mm and less than 0.088mm and in which the content of CaO is equal to or greater than 50% are selected, flake graphite is adopted as a carbon source, anhydrous thermoplastic phenolic resin is adopted as a binder, urotropin is adopted as a curing agent, and silicon powder is added to serve as an antioxidant. During molding, the density of the green brick is controlled at 2.92-3.05g/cm<3>, the heat treatment is performed in vacuum or under the protection of an atmosphere at the heat treatment temperature of 150-600 DEG C so as to produce high-performance dolomite carbon brick in which the content of CaO is equal to or greater than 40%. According to the method, due to adoption of a reasonable formula and heat treatment conditions, the technical problem of production of calcium-magnesium carbon bricks in which the content of CaO is greater than 40 or more is solved and the high-performance calcium-magnesium carbon bricks in which the content of CaO is greater than 40 or above are successfully produced. The dolomite carbon bricks have the effect of replacing magnesium carbon bricks and aluminum-magnesium carbon bricks so that the high-quality magnesite, bauxite and graphite resources of China are effectively protected.

Description

A kind of preparation method of rhombspar carbon brick
Technical field
The present invention relates to a kind of preparation method of carbon brick, particularly relate to a kind of preparation method of rhombspar carbon brick.
Background technology
Magnesia-calica refractory has the function of good high temperature resistant, slag resistance, resistance to heat shocks, high-temperature vacuum stability inferior and cleaning molten steel, is the first-selected refractory materials during Clean Steel Smelting is produced.Magnesia-calica refractory also has the advantage such as low value, environmental protection, is the best equivalent material of magnesia chrome brick in cement rotary kiln.In addition, the magnesium calcium system refractory product after serious damage can also, as the modification agent of soil, be a kind of environmental type refractory materials.Along with iron and steel and the fast development of Cement industry and the further raising of refractory product performance, the application of magnesia-calica refractory will be more and more extensive.
China's rhombspar, magnesite rich reserves, purity is high, distribution is wide, dolomite mineral more than 4,000,000,000 tons, and magnesite resource reserves reach 3,500,000,000 tons, and the magnesium resource of China accounts for 22.5% of world's total amount, occupies first place in the world.But along with the transition exploitation of magnesite and alumina resource, these national strategy resources are faced with exhausted danger, especially superfine magnesite and bauxite mine reserves little.The main producing region of magnesite mainly concentrates on Liaoning Province, and bauxite mine mainly concentrates on Shanxi Province and Henan Province.All parts of the country all need to introduce the magnesia raw material such as highly-purity magnesite or electrosmelted magnesite clinker from Liaoning Province, introduce alumina resource from Shanxi Province and Henan Province, purchase cost and transportation cost high.And the reserves of rhombspar are abundanter, the dolomite resources of high-quality is almost often economized by China.If solve the common technology problem such as high-purity calcium magnesite water resistant, resistance to flaking difference by development research; it can substitute highly-purity magnesite or electrosmelted magnesite clinker and aluminum oxide; be widely used in metallurgy and building material industry; become the basic refractory that raw material mining cost is low, transportation cost is low, resource distribution scope is wide, cost performance is high, effectively can protect the magnesium resource that country is limited.
Graphite is widely used in the fields such as electronics, military affairs, space flight, national defence, nuclear industry.Once some experts even predict that: 20th century were centuries of silicon, and 21 century will be the century of graphite.China's graphite ore reserves account for 75% of world's total reserves, and turnout accounts for 72% of Gross World Product, and graphite is one of rare several mineral products with international competitive advantage of China.But China's graphite resource faces coyoting disorderly to be dug, adopt richness and abandon many confusions such as poor, extensive operation, if do not protected, China's graphite resource or will exhaust in 20 years, protection graphite resource has become the task of top priority of China.
Magnesia-calcium-carbon brick is for main raw with rhombspar and graphite; the refractory materials that can directly use without burning till; have energy-conservation, thermal shock resistance is good; production technique is easy; there is good slag resistance simultaneously; in the molten bath of ladle, substitute magnesia carbon brick and alumina magnesia carbon brick according to high performance magnesium-calcium-carbon refractory materials, will effectively protect the high-quality magnesite of China, bauxite mine and graphite resource.
At present, CaO content is the magnesia-calcium-carbon brick production technology comparative maturity of 20-30%, be widely used aborning, but the magnesia-calcium-carbon brick production technology of CaO>40% or higher has much room for improvement, just there is crackle in special j in process of production, the problems such as aquation, cause the magnesia-calcium-carbon brick production technology of CaO>40% or higher not pass a test.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of rhombspar carbon brick, the method selects electrosmelted magnesite clinker and calcium magnesia sand, take crystalline flake graphite as carbon source, with anhydrous novolac resin for bonding agent, take urotropine as solidifying agent, adding silica flour is oxidation inhibitor, produces the high-performance rhombspar carbon brick of CaO >=40%.In the molten bath of steel, substitute magnesia carbon brick and alumina magnesia carbon brick, make it to protect the high-quality magnesite of China, bauxite mine and graphite resource.
The object of the invention is to be achieved through the following technical solutions:
A kind of preparation method of rhombspar carbon brick, described method comprises: the electrosmelted magnesite clinker selecting granularity 5-8mm, 5-3mm, 3-1mm, the granularity of 1-0mm and <0.088mm selects the dolomite sand of CaO>=50%, is carbon source, with anhydrous novolac resin for bonding agent with crystalline flake graphite, be solidifying agent with urotropine, adding silica flour is oxidation inhibitor; Time shaping, the density domination of adobe is at 2.92-3.05g/cm 3, through thermal treatment after shaping, produce CaO>=40% high-performance rhombspar carbon brick;
Its preparation process is as follows:
1) sand mill is opened, first drop into magnesia, dolomite sand and the urotropine that granularity is 8-5 mm, 5-3mm, 3-1mm and 0-1mm to mix 1 minute, add resol, mixed 2 minutes, add graphite again, mixed 3 minutes, finally add the dolomite fines of granularity < 0.088mm, silica flour, mixed 3 minutes, discharging;
2) mixed material is become base in mould, be then placed in vacuum or nitrogen protection or CO 2heat in gas shield stove, at 150-600 DEG C, heating 0.5-8h, after in 70 DEG C of paraffin, soak half an hour, obtain dolomite brick finished product;
Each raw material is as follows by weight ratio:
Magnesia 5-8 part of 8-5 mm;
Dolomite sand 12-15 part of 5-3mm;
Dolomite sand 33-36 part of 3-1mm;
Dolomite sand 20-25 part of 0-1mm;
Dolomite fines 16-20 part of < 0.088mm;
Graphite 5-10 part;
Silica flour 0.5-2.5 part;
The add-on of resol is the 2.5-4.5% of rhombspar, magnesia, graphite and silica flour gross weight, and the add-on of urotropine is the 10-15% of resol.
The preparation method of described a kind of rhombspar carbon brick, the particle of described granularity 5-8 selects the electrosmelted magnesite clinker of MgO>97.0%, granularity is 5-3mm, the particle of 3-1mm selects the high-quality dolomite sand of CaO >=50%, granularity to be the high quality white marble dust that the fine powder of 1-0mm and <0.088mm selects CaO >=50%.
The preparation method of described a kind of rhombspar carbon brick, the shaping postheat treatment atmosphere of described carbon brick is vacuum or nitrogen protection or CO 2gas shield, thermal treatment temp is 150-600 DEG C.
Advantage of the present invention and effect are:
Creativeness of the present invention is at preparation CaO >=40% or higher high-performance rhombspar carbon brick.High performance magnesium-calcium-carbon refractory materials substitutes magnesia carbon brick and alumina magnesia carbon brick in the molten bath of ladle, will effectively protect the high-quality magnesite of China, bauxite mine and graphite resource.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1: a kind of method preparing CaO >=40% high-performance rhombspar carbon brick
(1) method is as follows:
1) by granularity be the mixed about 1-2 minute of the magnesia of 8-5 mm, 5-3mm, 3-1mm and 0-1mm, CaO>50 high-quality dolomite sand and urotropine, add resol, mixed about 2-4 minute, add graphite again, mixed about 3 minutes, finally add CaO>50 high-quality dolomite fines, the silica flour of granularity < 0.088mm, mixed about 3 minutes, discharging; Each raw material is as follows by weight ratio:
Magnesia 5-8 part of 8-5 mm,
Dolomite sand 12-15 part of 5-3mm,
Dolomite sand 33-36 part of 3-1mm,
Dolomite sand 20-25 part of 0-1mm,
Dolomite fines 16-20 part of < 0.088mm,
Graphite 5-9 part,
Silica flour 0.5-2.5 part,
The add-on of resol is the 2.5-4.5% of rhombspar, magnesia, graphite and silica flour gross weight,
The add-on of urotropine is the 10-15% of resol.
2) mixed material is become base in mould, time shaping, the density domination of adobe is at 2.92-3.05g/cm 3, be then placed in vacuum oven and heat, at 150-600 DEG C, heating 0.5-8h, after in 70 DEG C of paraffin, soak half an hour, obtained rhombspar carbon brick.
(2) detected result
The expection physical and chemical index of the rhombspar carbon brick of CaO>=40% is as follows: CaO>=40%, MgO>=43%, C=7 ± 2%, volume density (BD)>=2.90 g/cm 3, compressive strength (CCS)>=30 MPa, apparent porosity (AP)≤8.0%.
Index during 1500 DEG C × 2h/s reductive firing: AP≤14%, BD>=2.85 g/cm 3, CCS>=20 MPa.
Embodiment 2: a kind of method preparing CaO >=50% high-performance rhombspar carbon brick
(1) method is as follows:
1) by granularity be the mixed about 1-2 minute of the magnesia of 8-5 mm, 5-3mm, 3-1mm and 0-1mm, CaO>50 high-quality dolomite sand and urotropine, add resol, mixed about 2-4 minute, add graphite again, mixed about 3 minutes, finally add CaO>55% dolomite fines, the silica flour of granularity < 0.088mm, mixed about 3 minutes, discharging; Each raw material is as follows by weight ratio:
Magnesia 5-8 part of 8-5 mm,
Dolomite sand 12-15 part of 5-3mm,
Dolomite sand 33-36 part of 3-1mm,
Dolomite sand 20-25 part of 0-1mm,
Dolomite fines 16-20 part of < 0.088mm,
Graphite 6-10 part,
Silica flour 0.5-2.5 part,
The add-on of resol is the 2.5-4.5% of rhombspar, magnesia, graphite and silica flour gross weight,
The add-on of urotropine is the 10-15% of resol.
2) mixed material is become base in mould, time shaping, the density domination of adobe is at 2.92-3.05g/cm 3, be then placed in nitrogen furnace and heat, at 550-600 DEG C, heating 0.5-8h, after in 70 DEG C of paraffin, soak half an hour, obtained rhombspar carbon brick.
 
(2) detected result:
The expection physical and chemical index of the rhombspar carbon brick of CaO>=50% is as follows: CaO>=50%, MgO>=33%, C=8 ± 2%, volume density (BD)>=2.88 g/cm 3, compressive strength (CCS)>=30 MPa, apparent porosity (AP)≤8.0%.
Index during 1500 DEG C × 2h/s reductive firing: AP≤14%, BD>=2.83 g/cm 3, CCS>=20 MPa.
Embodiment 3; A kind of method preparing CaO >=50% high-performance rhombspar carbon brick
(1) method is as follows:
1) by granularity be the mixed about 1-2 minute of the magnesia of 8-5 mm, 5-3mm, 3-1mm and 0-1mm, CaO>50 dolomite sand and urotropine, add resol, mixed about 2-4 minute, add graphite again, mixed about 3 minutes, finally add CaO>55% dolomite fines, the silica flour of granularity < 0.088mm, mixed about 3 minutes, discharging; Each raw material is as follows by weight ratio:
Magnesia 5-8 part of 8-5 mm,
Dolomite sand 12-15 part of 5-3mm,
Dolomite sand 33-36 part of 3-1mm,
Dolomite sand 20-25 part of 0-1mm,
Dolomite fines 16-20 part of < 0.088mm,
Graphite 5-9 part,
Silica flour 0.5-2.5 part,
The add-on of resol is the 2.5-4.5% of rhombspar, magnesia, graphite and silica flour gross weight,
The add-on of urotropine is the 10-15% of resol.
2) mixed material is become base in mould, time shaping, the density domination of adobe is at 2.92-3.05g/cm 3, be then placed in CO 2heat in atmosphere protection stove, at 150-600 DEG C, heating 0.5-8h, obtained rhombspar carbon brick.
(2) detected result:
The expection physical and chemical index of the rhombspar carbon brick of CaO>=50% is as follows: CaO>=50%, MgO>=33%, C=5-11%, BD>=2.88 g/cm 3, CCS>=30 MPa, AP≤8.0%.
Index during 1500 DEG C × 2h/s reductive firing: AP≤14%, BD>=2.83 g/cm 3, CCS>=20 MPa.

Claims (3)

1. the preparation method of a rhombspar carbon brick, it is characterized in that, described method comprises: the electrosmelted magnesite clinker selecting granularity 5-8mm, the granularity of 5-3mm, 3-1mm, 1-0mm and <0.088mm selects the dolomite sand of CaO>=50%, take crystalline flake graphite as carbon source, with anhydrous novolac resin for bonding agent, be solidifying agent with urotropine, adding silica flour is oxidation inhibitor; Time shaping, the density domination of adobe is at 2.92-3.05g/cm 3, through thermal treatment after shaping, produce CaO>=40% high-performance rhombspar carbon brick;
Its preparation process is as follows:
Open sand mill, first drop into magnesia, dolomite sand and the urotropine that granularity is 8-5 mm, 5-3mm, 3-1mm and 0-1mm to mix 1 minute, add resol, mixed 2 minutes, add graphite again, mixed 3 minutes, finally add the dolomite fines of granularity < 0.088mm, silica flour, mixed 3 minutes, discharging;
Mixed material is become base in mould, is then placed in vacuum or nitrogen protection or CO 2heat in gas shield stove, at 150-600 DEG C, heating 0.5-8h, after in 70 DEG C of paraffin, soak half an hour, obtain dolomite brick finished product;
Each raw material is as follows by weight ratio:
Magnesia 5-8 part of 8-5 mm;
Dolomite sand 12-15 part of 5-3mm;
Dolomite sand 33-36 part of 3-1mm;
Dolomite sand 20-25 part of 0-1mm;
Dolomite fines 16-20 part of < 0.088mm;
Graphite 5-10 part;
Silica flour 0.5-2.5 part;
The add-on of resol is the 2.5-4.5% of rhombspar, magnesia, graphite and silica flour gross weight, and the add-on of urotropine is the 10-15% of resol.
2. the preparation method of a kind of rhombspar carbon brick according to claim 1, it is characterized in that, the particle of described granularity 5-8 selects the electrosmelted magnesite clinker of MgO>97.0%, granularity is 5-3mm, the particle of 3-1mm selects the high-quality dolomite sand of CaO >=50%, granularity to be the high quality white marble dust that the fine powder of 1-0mm and <0.088mm selects CaO >=50%.
3. the preparation method of a kind of rhombspar carbon brick according to claim 1, is characterized in that, the shaping postheat treatment atmosphere of described carbon brick is vacuum or nitrogen protection or CO 2gas shield, thermal treatment temp is 150-600 DEG C.
CN201410480471.7A 2014-09-19 2014-09-19 A kind of preparation method of rhombspar carbon brick Expired - Fee Related CN104261845B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114230370A (en) * 2022-01-20 2022-03-25 海城利尔麦格西塔材料有限公司 Waterproof method for unburned magnesium-calcium-carbon brick

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102167607A (en) * 2011-01-27 2011-08-31 营口鲅鱼圈耐火材料有限公司 Dolomite non-burning carbon brick and preparation method thereof
CN102765951A (en) * 2012-08-02 2012-11-07 营口青花耐火材料股份有限公司 Magnesium-calcium-titanium-carbon brick and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102167607A (en) * 2011-01-27 2011-08-31 营口鲅鱼圈耐火材料有限公司 Dolomite non-burning carbon brick and preparation method thereof
CN102765951A (en) * 2012-08-02 2012-11-07 营口青花耐火材料股份有限公司 Magnesium-calcium-titanium-carbon brick and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114230370A (en) * 2022-01-20 2022-03-25 海城利尔麦格西塔材料有限公司 Waterproof method for unburned magnesium-calcium-carbon brick

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