CN106747509A - A kind of ladle wall carbon-free pressed machine brick and preparation method thereof - Google Patents

Abstract

A kind of ladle wall carbon-free pressed machine brick and preparation method thereof, with bauxite clinker, diamond spar series raw material, fused magnesite, electric smelting spinelle, activity а alumina powders as primary raw material, add spent pulping liquor, be prepared as combined binder using magnalium cementing agent, calgon, yellow starch gum, several raw materials of carboxymethylcellulose calcium, it is compressing on 500 800 tons of friction press after being stirred in homogenizer；Qualified base substrate will be checked to be heat-treated in sending into tunnel drying oven after shaping, 100 DEG C of dry kiln inlet temperature 80 DEG C is incubated 250 DEG C of silicon carbide 180 DEG C, and 100 DEG C of outlet temperature 80 DEG C, heat treatment time is not less than 20 hours；The present invention uses inorganic combination, not cement, and high-temperature behavior is good；Using mechanical pressing, bulk density is big, and the porosity is low, and erosion-resisting characteristics is strong；Using mechanical pressing low-temperature bake technology, rhythm of production is fast.

Description

A kind of ladle wall carbon-free pressed machine brick and preparation method thereof

Technical field

The invention belongs to fire resisting material field, and in particular to a kind of ladle wall carbon-free pressed machine brick and preparation method thereof.

Background technology

It is continuously increased with to various fine steel grade demands, iron and steel smelting technology personnel are to various refractory materials in metallurgy Carburetting problem in technical process to steel grade is paid attention to further, it is desirable to subtract as far as possible in smelting low carbon fine steel grade technical process The use of few carbon containing refractory is to molten steel recarburization adverse effect.The technique of clean steel can be described as to molten steel decarburization With the process for substantially reducing the impurity elements such as O, S, N, P, H.The development of mild steel, ultra-low-carbon steel, corresponding requirements development low-carbon (LC) or Carbon-free refractories.Therefore, to reduce pollution of the carbon containing refractory to molten steel, steel mill requires that containment wall uses carbon free precast block, Bag bottom castable or carbon free precast block.At present, domestic carbon-free ladle wall is typically built by laying bricks or stones using prefabricated section, although carbon-free prefabricated Block is not carbon containing, but because brick is small, production efficiency is too slow, while workshop requires that place is big to put mould, with first-class various Condition limits the rhythm of production of carbon free precast block, and the production of high-volume prefabricated section cannot be ensured at all；Further, since prefabricated section It is required that the curing time influence along with factors such as bakings long causes the production cycle of prefabricated section especially long, it is impossible to meet steel mill fast The need for rhythm is produced.Therefore the carbon-free pressed machine brick of research fast pace production ladle wall turns into working as current fire resisting material field Business is anxious.

The content of the invention

The purpose of the present invention is intended to overcome the shortcoming of production prefabricated section, there is provided a kind of rhythm of production is fast, high-temperature behavior is good, anti- The erosion performance carbon-free pressed machine brick of strong ladle wall, it is a further object of the present invention to provide a kind of ladle wall with carbon-free machine pressure The preparation method of brick.

To reach above-mentioned purpose, the present invention is solved using following scheme：A kind of carbon-free pressed machine brick of ladle wall, Qi Geyuan Expect that the composition of component unit serving meter by weight is as follows：15-25 parts of 3-5mm aggregates, 20-35 parts of 1-3mm aggregates, 0.088-1mm bones 8-15 parts of material, above aggregate is one or more in bauxite clinker, fused magnesite or corundum system refractory raw material, the fire resisting of corundum system Raw material includes alundum, fused white corundum, Brown Alundum；1-5 parts of 0.088-1mm fused magnesite aggregates, the mesh of white fused alumina fine powder 325 10-15 parts, mesh 10-18 parts of electric smelting spinelle fine powder 325, activity а-alumina powder 3-10 parts, the mesh 3- of fused magnesite fine powder 180 8 parts, 0.5-5 parts of magnalium cementing agent, calgon 0.2-2 parts, yellow starch gum 0.1-2 parts, carboxymethylcellulose calcium 0.1-1 parts, paper Pulp waste 1-5 parts, paper pulp proportion >=1.25 g/cm in spent pulping liquor³；Above-mentioned various raw materials mix in proportion after mechanical pressing, And it is thermally treated and be made.

Above-mentioned ladle wall is as follows with material performance described in carbon-free pressed machine brick：

1）Bauxite clinker, Al₂O₃Content >=88%, bulk density >=3.25g/cm³, Fe₂O₃Content≤1.5%.

2）Corundum system refractory raw material is one or more in alundum, fused white corundum, Brown Alundum, and granularity is 3-5mm, 1-3mm, 0.088-1mm, 325 mesh；

Fused white corundum：Al₂O₃>=98.5%, Fe₂O₃≤ 0.3, Na₂O≤0.5, true specific gravity >=3.94 g/cm³；

Brown Alundum：Al₂O₃>=94.5%, Fe₂O₃≤ 0.3, Si₂O≤1.0, true specific gravity >=3.80 g/cm³；

Alundum：Al₂O₃>=99.0%, Fe₂O₃≤ 0.1%, Si₂O≤0.2%, bulk density >=3.65 g/cm³。

3）Active а-alumina powder, Al₂O₃>=99.0%, average grain diameter≤10 μm；

4）Fused magnesite, content of MgO >=96%, bulk density >=3.4 g/cm³, SiO₂Content≤2.0%, CaO content≤2.0%；

5）The mesh of electric smelting spinelle fine powder 325, Al₂O₃Content 70%~80%, content of MgO 20%~30%；

6）Magnalium cementing agent Al₂O₃Content >=1.5%, content of MgO >=45%, CaO content≤2.0%, SiO₂Content≤2.0%；

7）Calgon, P₂O₅Content >=68%；

8）Yellow starch gum, cohesive force >=1.5Kg/cm²；

9）Spent pulping liquor, proportion >=1.25 g/cm³。

Preparation method of the invention is as follows：

（1）Kneading；Various aggregates are first weighed in proportion dry-mixed 1-2 minutes in high speed muller, be subsequently adding spent pulping liquor and mix Practice 3-5 minutes, add magnalium cementing agent, calgon, yellow starch gum, carboxymethylcellulose calcium mixture in mixer Stirring 3-5 minute, be eventually adding formula in remaining fused magnesite fine powder, electric smelting spinelle fine powder, activity а-alumina powder, White fused alumina fine powder, pug is gone out in 10-15 minutes in the stirring kneading of mixer high speed；

（2）Pressed compact；By in well mixed pug addition mould, base substrate is pressed on 500-800 tons of friction press；

（3）Heat treatment；Qualified base substrate will be checked to be heat-treated in sending into tunnel drying oven, dry kiln inlet temperature 80 DEG C -100 DEG C, 180 DEG C -250 DEG C of silicon carbide is incubated, 80 DEG C -100 DEG C of outlet temperature, heat treatment time is not less than 20 hours.

The present invention by unique technical recipe and brand-new articulated system, using with production magnesia carbon brick identical process route, Rhythm of production is slow when successfully solving the problems, such as to use carbon free precast block as carbon-free containment wall.It is not aqueous using inorganic combination Mud etc. influences the material of elevated temperature strength, therefore high-temperature behavior is good.Using mechanical pressing, bulk density is big, and the porosity is low, anti-erosion Performance is strong.

Primary raw material of the present invention is from bauxite clinker, corundum system raw material, electric smelting aluminum-spinel, fused magnesite etc.；This kind Product is allowed to possess certain intensity and meets movement requirement after producing using low-temperature bake technology.Due to the knot that it is used Syzygy system is not carbon containing, thus in smelting low carbon steel, ultra-low-carbon steel, will not form molten steel recarburization so as to pollute molten steel；By closing In-suit spinel reaction process of the grain composition and control product of reason during baking, use, has material higher Bulk density, the relatively low porosity, and of a relatively high thermal shock resistance energy, comprehensively improve the service life of bricking.With reference to System using magnalium cementing agent, six partially, yellow starch gum, carboxymethylcellulose calcium it is several compound as bonding agent, can just obtain at low temperature Intensity very high is obtained, more than 80MPa can be reached.With the raising of temperature, other materials in coupling system occur in succession again Effect, lifts the intensity without carbon brick.When temperature reaches more than 1200 DEG C, active а-aluminum oxide, the electric smelting introduced in the present invention The fine powders such as magnesia occur chemical reaction form spinelle, the bond strength of matrix can be improve again, that is to say, that the present invention from into To middle temperature, high temperature, intensity will not be reduced type, the need for fully meeting steel mill's production.

Specific embodiment

Embodiment 1

Prepare 20 parts of 3-5mm alundums aggregate, 30 parts of alundum aggregate 1-3mm, white fused alumina aggregate 0.088-1mm 15 Part；Prepare 12 parts of 325 mesh of white fused alumina fine powder, 10 parts of 325 mesh of electric smelting spinelle fine powder, active 5 parts of а-alumina powder, electric smelting 5 parts of 180 mesh of magnesia powder；Prepare 3 parts of magnalium cementing agent, 1 part of calgon, 0.5 part of yellow starch gum, carboxymethylcellulose calcium 0.2 Part, magnalium cementing agent, calgon, yellow starch gum, carboxymethylcellulose calcium are pre-mixed by required number be made it is pre- Mixed powder；Prepare 2.5 parts of spent pulping liquor.The aggregate that will be prepared is added to dry-mixed 1-2 minutes in mixer, is stirring evenly and then adding into 2.5 parts of spent pulping liquor continues to stir 3-5 minutes, is subsequently adding magnalium cementing agent, calgon, yellow starch gum, carboxymethyl fine The premixing flour for tieing up element is stirred 3-5 minutes, is eventually adding remaining other fine powder high-speed stirreds and is gone out pug in 10-15 minutes, and pug exists It is compressing on 500-800 tons of friction press, the product is can be prepared by after being heat-treated in tunnel type drying kiln, dry 80 DEG C -100 DEG C of dry kiln inlet temperature, is incubated 180 DEG C -250 DEG C of silicon carbide, 80 DEG C -100 DEG C of outlet temperature, heat treatment time Not less than 20 hours.

Embodiment 2

Prepare 20 parts of 3-5mm bauxite clinkers aggregate, 30 parts of fused brown corundum aggregate 1-3mm, white fused alumina aggregate 0.088-1mm 15 Part；Prepare 12 parts of 325 mesh of white fused alumina fine powder, 10 parts of 325 mesh of electric smelting spinelle fine powder, active 5 parts of а-alumina powder, electric-melting magnesium 5 parts of 180 mesh of sand fine powder；3 parts of magnalium cementing agent, 1 part of calgon, 0.5 part of yellow starch gum, 0.2 part of carboxymethylcellulose calcium are prepared, Magnalium cementing agent, calgon, yellow starch gum, carboxymethylcellulose calcium are pre-mixed by required number and are made premix Powder；Prepare 2.5 parts of spent pulping liquor.The aggregate that will be prepared is added to dry-mixed 1-2 minutes in mixer, is stirring evenly and then adding into 2.5 parts of spent pulping liquor continues to stir 3-5 minutes, is subsequently adding magnalium cementing agent, calgon, yellow starch gum, carboxymethyl fine The premixing flour for tieing up element is stirred 3-5 minutes, is eventually adding remaining other fine powder high-speed stirreds and is gone out pug in 10-15 minutes, and pug exists It is compressing on 500-800 tons of friction press, the product is can be prepared by after being heat-treated in tunnel type drying kiln, dry 80 DEG C -100 DEG C of dry kiln inlet temperature, is incubated 180 DEG C -250 DEG C of silicon carbide, 80 DEG C -100 DEG C of outlet temperature, heat treatment time Not less than 20 hours.

Embodiment 3

Prepare 20 parts of 3-5mm bauxite clinkers aggregate, 30 parts of bauxite clinker aggregate 1-3mm, bauxite clinker aggregate 0.088-1mm 12 Part, 3 parts of 0.088~1mm fused magnesites aggregate；Prepare 12 parts of 325 mesh of white fused alumina fine powder, 10 parts of 325 mesh of electric smelting spinelle fine powder, 5 parts of active а-alumina powder, 5 parts of 180 mesh of fused magnesite fine powder；Prepare 3 parts of magnalium cementing agent, 1 part of calgon, yellow paste Smart 0.5 part, 0.2 part of carboxymethylcellulose calcium, institute is pressed by magnalium cementing agent, calgon, yellow starch gum, carboxymethylcellulose calcium Need parts by weight to be pre-mixed and be made premixing flour；Prepare 2.5 parts of spent pulping liquor.The aggregate that will be prepared is added in mixer It is dry-mixed 1-2 minutes, be stirring evenly and then adding into 2.5 parts spent pulping liquor continue stir 3-5 minutes, be subsequently adding magnalium cementing agent, Calgon, yellow starch gum, the premixing flour of carboxymethylcellulose calcium are stirred 3-5 minutes, are eventually adding remaining other fine powder high-speed stirrings Mix and go out within 10-15 minutes pug, pug is compressing on 500-800 tons of friction press, is carried out in tunnel type drying kiln The product is can be prepared by after heat treatment, 80 DEG C -100 DEG C of drying kiln inlet temperature is incubated 180 DEG C -250 DEG C of silicon carbide, outlet 80 DEG C -100 DEG C of temperature, heat treatment time is not less than 20 hours.

Embodiment 1 is primarily adapted for use in capacity and is used on 200 tons and more than 200 tons ladles；Embodiment 2 is primarily adapted for use in appearance Amount is used more than 120 tons on less than 200 tons ladles；Embodiment 3 is primarily adapted for use in capacity and is used on ladle below 120 tons.

Claims (5)

1. the carbon-free pressed machine brick of a kind of ladle wall, it is characterised in that the composition of its each material component unit serving meter by weight is such as Under：15-25 parts of 3-5mm aggregates, 20-35 parts of 1-3mm aggregates, 8-15 parts of 0.088-1mm aggregates, above aggregate be bauxite clinker, One or more in fused magnesite or corundum system refractory raw material, corundum system refractory raw material include alundum, fused white corundum, Brown Alundum；1-5 parts of 0.088-1mm fused magnesite aggregates, mesh 10-15 parts of white fused alumina fine powder 325, the mesh of electric smelting spinelle fine powder 325 10-18 parts, it is activity а-alumina powder 3-10 parts, mesh 3-8 parts of fused magnesite fine powder 180,0.5-5 parts of magnalium cementing agent, six inclined Sodium phosphate 0.2-2 parts, yellow starch gum 0.1-2 parts, carboxymethylcellulose calcium 0.1-1 parts, spent pulping liquor 1-5 parts, paper pulp in spent pulping liquor Proportion >=1.25 g/cm³；Above-mentioned various raw materials mix in proportion after mechanical pressing, it is and thermally treated and be made carbon-free pressed machine brick.

2. the carbon-free pressed machine brick of ladle wall according to claim 1, it is characterised in that described bauxite clinker：Al₂O₃Contain Amount >=88%, bulk density >=3.25g/cm³, Fe₂O₃Content≤1.5%；Fused white corundum：Al₂O₃>=98.5%, Fe₂O₃≤ 0.3, Na₂O≤0.5, true specific gravity >=3.94 g/cm³；Brown Alundum：Al₂O₃>=94.5%, Fe₂O₃≤ 0.3, Si₂O≤1.0, very Proportion >=3.80 g/cm³；Alundum：Al₂O₃>=99.0%, Fe₂O₃≤ 0.1%, Si₂O≤0.2%, bulk density >=3.65 g/cm³。

3. the carbon-free pressed machine brick of ladle wall according to claim 1, it is characterised in that described active а-aluminum oxide is micro- Powder：Average grain diameter≤10 μm；The fused magnesite：Content of MgO >=96%, bulk density >=3.4 g/cm3, SiO₂Content≤ 2.0%, CaO content≤2.0%；The described mesh of electric smelting spinelle fine powder 325：Al₂O₃Content 70%-80%, content of MgO 20%-30%.

4. the carbon-free pressed machine brick of ladle wall according to claim 1, it is characterised in that described magnalium cementing agent:Al₂O₃ Content >=1.5%, content of MgO >=45%, CaO content≤2.0%, SiO₂Content≤2.0%；Calgon, P₂O₅Content >=68%； Yellow starch gum：Cohesive force >=1.5Kg/cm²；Spent pulping liquor, proportion >=1.25 g/cm³。

5. the ladle wall preparation method of carbon-free pressed machine brick according to claim 1, it is characterised in that：

（1）Kneading；Various aggregates are first weighed in proportion dry-mixed 1-2 minutes in high speed muller, be subsequently adding spent pulping liquor and mix Practice 3-5 minutes, add magnalium cementing agent, calgon, yellow starch gum, carboxymethylcellulose calcium mixture in mixer Stirring 3-5 minute, be eventually adding formula in remaining fused magnesite fine powder, electric smelting spinelle fine powder, activity а-alumina powder, White fused alumina fine powder, pug is gone out in 10-15 minutes in the stirring kneading of mixer high speed；

（2）Pressed compact；By in well mixed pug addition mould, base substrate is pressed on 500-800 tons of friction press；

（3）Heat treatment；Qualified base substrate will be checked to be heat-treated in sending into tunnel drying oven, dry kiln inlet temperature 80 DEG C -100 DEG C, 180 DEG C -250 DEG C of silicon carbide is incubated, 80 DEG C -100 DEG C of outlet temperature, heat treatment time is not less than 20 hours.