CN109160812A - The low thermally conductive Mg-Al spinel brick of cement kiln - Google Patents

The low thermally conductive Mg-Al spinel brick of cement kiln Download PDF

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Publication number
CN109160812A
CN109160812A CN201810981992.9A CN201810981992A CN109160812A CN 109160812 A CN109160812 A CN 109160812A CN 201810981992 A CN201810981992 A CN 201810981992A CN 109160812 A CN109160812 A CN 109160812A
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China
Prior art keywords
parts
granularity
highly
forsterite
spinel
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Pending
Application number
CN201810981992.9A
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Chinese (zh)
Inventor
杨敬彪
张义先
王振宇
王新杰
杨庆余
王健骁
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Haicheng Lear Meg Materials Co Ltd Sita
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Haicheng Lear Meg Materials Co Ltd Sita
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Priority to CN201810981992.9A priority Critical patent/CN109160812A/en
Publication of CN109160812A publication Critical patent/CN109160812A/en
Pending legal-status Critical Current

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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
    • C04B35/01—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
    • C04B35/44—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 aluminates
    • C04B35/443—Magnesium aluminate spinel
    • 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
    • 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
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • 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
    • 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
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427—Silicates other than clay, e.g. water glass
    • C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
    • C04B2235/3445—Magnesium silicates, e.g. forsterite
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance

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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 present invention proposes a kind of low thermally conductive Mg-Al spinel brick of cement kiln, including following raw material: 10-20 parts of highly-purity magnesite of 0 < granularity≤1mm, 30-40 parts of highly-purity magnesite of 1 < granularity≤3mm, 5-15 parts of highly-purity magnesite of 3 < granularities≤5mm, 200 20-30 parts of mesh highly-purity magnesites, 0.5 < granularity≤5-9 parts of 2mm electric melting magnesium aluminum spinel；30-40 parts of forsterite sand of 0 < granularity≤1mm (0-1mm), 35-45 parts of forsterite sand of 1 < granularity≤3mm, 200 20-30 parts of mesh highly-purity magnesites.The present invention uses 2 kinds of unlike materials, working lining Mg-Al spinel brick, inoperative layer forsterite brick, two kinds of materials it is pure with same is magnesia is fired into bricks.Inoperative layer forsterite reduces by 100 DEG C of cement kiln tube body temperature or more since thermal conductivity is well below magnesium aluminate spinel material.Cost is relatively low for forsterite material, advantageously reduces cost of material.It is not influencing service life simultaneously, is improving the cement kiln thermal efficiency.

Description

The low thermally conductive Mg-Al spinel brick of cement kiln
Technical field
The present invention relates to technical field of refractory materials, in particular to the low thermally conductive Mg-Al spinel brick of a kind of cement kiln.
Background technique
In the magnalium in the 1930s, foreign countries begin one's study, magnesia spinel series refractory material, initially with commercial alumina or Bauxite clinker is raw material production firing magnesia-alumina brick.Start with light calcined magnesia and commercial alumina to be raw material again later, by certain Ratio prepare firing magnesium-aluminum spinel raw material, then be broken into aggregate and be added in magnesia refractories, produce magnesium through firing Spinel brick.Magnalium, magnesia spinel series refractory material have better refractoriness under load and more preferable compared with magnesia refractories Thermal shock resistance.China begins one's study magnesia-alumina brick from the 1950s, is used primarily for open hearth and replaces for silica brick, makes open hearth top Service life increases substantially.Start the eighties to carry out synthesis magnesia spinel raw material work, using China's magnesite resource abundant, adopt Different Al are produced with the method for firing or electric smelting2O3The magnesium aluminate spinel of content.
Forsterite refractory is the refractory material using forsterite as principal crystalline phase.Multi-purpose peridotite and dunite etc. It is made as primary raw material.Wherein claim forsterite brick through molding product.Pure forsterite fusing point is 1890 DEG C, is MgO-SiO2Fire resisting phase uniquely stable in system, by M in room temperature to melting range2S does not have isomerism transformation, so it is hot It is better than magnesia brick to shake stability.
It is mainly used as the furnace lining material of non-ferrous metal smelting furnace, the safety liner of steelmaking converter and electric furnace, Bottom of Heating Furnace, heat The checker brick of wind furnace and various industrial furnace regenerative chambers, glass melter regenerator lattice brick, forge furnace and cement kiln it is interior Lining material etc..
Summary of the invention
The technical issues of present invention provides a kind of cement kiln low thermally conductive Mg-Al spinel brick, solution is to reduce magnalium point crystalline substance Stone brick thermal conductivity improves the cement kiln thermal efficiency, reduces barrel temperature.
To achieve the above object, the present invention is implemented with the following technical solutions:
A kind of cement kiln low thermally conductive Mg-Al spinel brick, including following raw material: 0 < granularity≤1mm (0-1mm) 10-20 parts of 97 highly-purity magnesite, 30-40 parts of 97 highly-purity magnesite of 1 < granularity≤3mm, 3 < granularities≤5mm, 97 highly-purity magnesites 5-15 parts, 20-30 parts of 200 mesh, 97 highly-purity magnesite, 0.5 < granularity≤5-9 parts of 2mm electric melting magnesium aluminum spinel；0 < granularity≤1mm 30-40 parts of the forsterite sand of (0-1mm), 35-45 parts of forsterite sand of 1 < granularity≤3mm, 200 mesh, 97 highly-purity magnesite 20- 30 parts.
It is not influencing service life simultaneously, is improving the cement kiln thermal efficiency, reducing barrel temperature.
A kind of production method of the low thermally conductive Mg-Al spinel brick of cement kiln, the specific steps are as follows:
1) raw material is broken, sieves, fine grinding:
97 highly-purity magnesites are finely ground into 5-3mm, 3-1mm, 1-0mm, 200 mesh through being crushed；
Electric melting magnesium aluminum spinel directly purchases granularity 2-0.5mm；
Forsterite sand purchases granularity 3-1mm, 1-0mm.
2) ingredient:
Two kinds of materials of magnesium aluminate spinel and forsterite distinguish ingredient, by above-mentioned weight.
3) it is kneaded:
First plus 3-5mm, 1-3mm, 0-1mm granularity material, then bonding agent liquid paper pulp, then mixed 97 electricity is added in dry-mixed 3min 200 mesh of fused magnesia mixes 8-12min, then discharges.
4) mechanical pressing:
It being formed using 630 tons of brick machines, working lining magnesium aluminate spinel body is close >=3.05g/cm3；Inoperative layer forsterite Body is close >=2.50g/cm3。
5) it is heat-treated:
Dry kiln, 120 DEG C, when heat treatment >=12h.
6) it is burnt into:
1550 DEG C of maximum temperature of firing, total firing time 75h.
Compared with prior art, the beneficial effects of the present invention are:
1, inoperative layer forsterite material can be effectively reduced since thermal conductivity is significantly less than magnesium aluminate spinel material 100 DEG C of barrel temperature or more, improve the cement kiln thermal efficiency；It is not influencing service life simultaneously, is improving the cement kiln thermal efficiency, dropping Low barrel temperature.
2, forsterite raw material cost substantially reduces former material cost well below magnesia, the composite brick of two kinds of materials production, Reduce the dosage of magnesia.
3, two kinds of different materials are existed simultaneously in same brick, same temperature firing.
Specific embodiment
Below with reference to embodiment, the present invention is further described:
The present invention will be described in detail for following embodiment.These embodiments be only to preferred embodiment of the invention into Row description, does not limit the scope of the present invention.
The low thermally conductive Mg-Al spinel brick of cement kiln, comprising:
200 mesh, 97 highly-purity magnesite；97 highly-purity magnesites of 1-0mm；3-1mm97 highly-purity magnesite；5-3mm97 highly-purity magnesite；
The magnesium olive sand of 3-1mm；The magnesium olive sand of 5-3mm；
The electric melting magnesium aluminum spinel of 0.5-2mm.
Primary raw material index is shown in Table 1
1 primary raw material index unit of table: wt%
Embodiment 1
Cement kiln is shown in Table 2 with low thermally conductive mafic spinel brick raw material proportioning
2 embodiment 1 of table preparation formula
Raw material Granularity, mm Magnesium aluminate spinel parts by weight Forsterite parts by weight
97 highly-purity magnesites 5-3 10
97 highly-purity magnesites 3-1 30
97 highly-purity magnesites 1-0 20
Electric melting magnesium aluminum spinel 2-0.5 8
97 highly-purity magnesites 200 mesh 30 25
Forsterite sand 3-1 40
Forsterite sand 1-0 35
The low thermally conductive Mg-Al spinel brick production method of cement kiln, the specific steps are as follows:
1) raw material is broken, sieves, fine grinding:
97 highly-purity magnesites are finely ground into 5-3mm, 3-1mm, 1-0mm, 200 mesh through being crushed；
Electric melting magnesium aluminum spinel directly purchases granularity 2-0.5mm；
Forsterite sand purchases granularity 3-1mm, 1-0mm.
2) ingredient:
Two kinds of materials of magnesium aluminate spinel and forsterite distinguish ingredient, by above-mentioned weight.
3) it is kneaded:
First plus 3-5mm, 1-3mm, 0-1mm granularity material, then bonding agent liquid paper pulp, then mixed 97 electricity is added in dry-mixed 3min 200 mesh of fused magnesia mixes 8-12min, then discharges.
4) mechanical pressing
It being formed using 630 tons of brick machines, working lining magnoferrite body is close >=3.05g/cm3；Inoperative layer forsterite Body is close >=2.50g/cm3。
5) it is heat-treated
Dry kiln, 120 DEG C, when heat treatment >=12h.
6) it is burnt into
1550 DEG C of maximum temperature of firing, total firing time 75h.
7) physical and chemical index
The physical and chemical index of 3 brick of table
Project Mafic spinel brick (working lining) Forsterite brick (inoperative layer)
MgO, % 91.5 60.80
CaO, % 1.06 1.60
SiO2, % 0.65 31.50
Al2O3, % 5.45 0.90
Fe2O3, % 0.85 5.02
Apparent porosity, % 15.5 18.5
Body density, g/cm3 3.0 2.48
Cold crushing strength, MPa 62 48
Embodiment 2
Cement kiln is shown in Table 4 with low thermally conductive Mg-Al spinel brick raw material proportioning
4 embodiment 2 of table preparation formula
The low thermally conductive Mg-Al spinel brick production method of cement kiln, the specific steps are as follows:
1) raw material is broken, sieves, fine grinding:
97 highly-purity magnesites are finely ground into 5-3mm, 3-1mm, 1-0mm, 200 mesh through being crushed；
Electric melting magnesium aluminum spinel directly purchases granularity 2-0.5mm；
Forsterite sand purchases granularity 3-1mm, 1-0mm；
2) ingredient:
Two kinds of materials of magnesium aluminate spinel and forsterite distinguish ingredient, by above-mentioned weight.
3) it is kneaded:
First plus 3-5mm, 1-3mm, 0-1mm granularity material, then bonding agent liquid paper pulp, then mixed 97 electricity is added in dry-mixed 3min 200 mesh of fused magnesia mixes 8-12min, then discharges；
4) mechanical pressing
It being formed using 630 tons of brick machines, working lining magnesium aluminate spinel body is close >=3.05g/cm3；Inoperative layer forsterite Body is close >=2.50g/cm3。
5) it is heat-treated
Dry kiln, 120 DEG C, when heat treatment >=12h.
6) it is burnt into
1550 DEG C of maximum temperature of firing, total firing time 75h.
7) physical and chemical index see the table below 5:
Table 5: the physical and chemical index of 2 brick of embodiment

Claims (2)

1. a kind of low thermally conductive Mg-Al spinel brick of cement kiln, which is characterized in that including following raw material: 0 < granularity≤ 10-20 parts of the highly-purity magnesite of 1mm, 30-40 parts of highly-purity magnesite of 1 < granularity≤3mm, 3 < granularities≤5mm highly-purity magnesite 5-15 Part, 200 20-30 parts of mesh highly-purity magnesites, 0.5 < granularity≤5-9 parts of 2mm electric melting magnesium aluminum spinel；0 < granularity≤1mm magnesium olive 30-40 parts of olive stone sand, 35-45 parts of forsterite sand of 1 < granularity≤3mm, 200 20-30 parts of mesh highly-purity magnesites.
2. a kind of production method of the low thermally conductive Mg-Al spinel brick of cement kiln as described in claim 1, which is characterized in that tool Steps are as follows for body:
1) raw material is broken, sieves, fine grinding:
97 highly-purity magnesites are finely ground into 5-3mm, 3-1mm, 1-0mm, 200 mesh through being crushed；
Electric melting magnesium aluminum spinel directly purchases granularity 2-0.5mm；
Forsterite sand purchases granularity 3-1mm, 1-0mm；
2) ingredient:
Two kinds of materials of magnesium aluminate spinel and forsterite distinguish ingredient, match by above-mentioned parts by weight；
3) it is kneaded:
First plus 3-5mm, 1-3mm, 0-1mm granularity material, then bonding agent liquid paper pulp, then mixed 97 electric-melting magnesiums are added in dry-mixed 3min 200 mesh of sand mixes 8-12min, then discharges；
4) mechanical pressing:
It being formed using 630 tons of brick machines, working lining magnesium aluminate spinel body is close >=3.05g/cm3；Inoperative layer forsterite body be close >= 2.50g/cm3；
5) it is heat-treated:
Dry kiln, 120 DEG C, when heat treatment >=12h；
6) it is burnt into:
1550 DEG C of maximum temperature of firing, total firing time 75h.
CN201810981992.9A 2018-08-27 2018-08-27 The low thermally conductive Mg-Al spinel brick of cement kiln Pending CN109160812A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113698181A (en) * 2021-08-23 2021-11-26 郑州瑞泰耐火科技有限公司 Low-thermal-conductivity multilayer composite magnesia-hercynite brick and preparation process thereof
CN114953109A (en) * 2022-05-18 2022-08-30 海城利尔麦格西塔材料有限公司 Low-heat-conduction magnesium-aluminum spinel brick production equipment for lime kiln
CN115925433A (en) * 2022-12-31 2023-04-07 海城利尔麦格西塔材料有限公司 Forsterite composite brick and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101450867A (en) * 2007-12-07 2009-06-10 上海宝钢工业检测公司 Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same
CN107117976A (en) * 2017-06-09 2017-09-01 安徽海螺暹罗耐火材料有限公司 A kind of transition band of cement kiln Mg-Al spinel brick and preparation method thereof
CN107935574A (en) * 2017-10-20 2018-04-20 淄博市鲁中耐火材料有限公司 The complete low heat conduction liner of cement kiln tube body
CN108101563A (en) * 2018-01-12 2018-06-01 安徽海螺暹罗耐火材料有限公司 Cement kiln non-chromium alkaline refractory brick and its production method
CN108424125A (en) * 2018-03-12 2018-08-21 海城利尔麦格西塔材料有限公司 Cement kiln low heat conduction mafic spinel brick and preparation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101450867A (en) * 2007-12-07 2009-06-10 上海宝钢工业检测公司 Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same
CN107117976A (en) * 2017-06-09 2017-09-01 安徽海螺暹罗耐火材料有限公司 A kind of transition band of cement kiln Mg-Al spinel brick and preparation method thereof
CN107935574A (en) * 2017-10-20 2018-04-20 淄博市鲁中耐火材料有限公司 The complete low heat conduction liner of cement kiln tube body
CN108101563A (en) * 2018-01-12 2018-06-01 安徽海螺暹罗耐火材料有限公司 Cement kiln non-chromium alkaline refractory brick and its production method
CN108424125A (en) * 2018-03-12 2018-08-21 海城利尔麦格西塔材料有限公司 Cement kiln low heat conduction mafic spinel brick and preparation method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113698181A (en) * 2021-08-23 2021-11-26 郑州瑞泰耐火科技有限公司 Low-thermal-conductivity multilayer composite magnesia-hercynite brick and preparation process thereof
CN114953109A (en) * 2022-05-18 2022-08-30 海城利尔麦格西塔材料有限公司 Low-heat-conduction magnesium-aluminum spinel brick production equipment for lime kiln
CN115925433A (en) * 2022-12-31 2023-04-07 海城利尔麦格西塔材料有限公司 Forsterite composite brick and preparation method thereof

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