CN114315392B - Fluid stirring purification jointed board preparation material and fluid stirring purification jointed board preparation process - Google Patents

Abstract

The invention discloses a fluid stirring purification jointed board preparation material and a fluid stirring purification jointed board preparation process, wherein the fluid stirring purification jointed board preparation material comprises the following components in parts by weight: 45 to 79 weight portions of corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 0.5 to 8 weight portions of corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 0.5 to 10 weight portions of alumina micropowder with the grain diameter of 1 to 5 mu m, 1 to 8 weight portions of bonding agent and 5 to 24 weight portions of performance enhancer; the preparation process of the fluid stirring purification jointed board is to prepare the fluid stirring purification jointed board by adopting the fluid stirring purification jointed board preparation material. According to the invention, the slag resistance and the thermal shock stability of the prepared fluid stirring purification jointed board are obviously improved by adjusting the proportion of each component in the fluid stirring purification jointed board preparation material and adding a performance enhancer in the fluid stirring purification jointed board preparation material.

Description

Fluid stirring purification jointed board preparation material and fluid stirring purification jointed board preparation process

Technical Field

The invention relates to the technical field of fluid stirring and purification. In particular to a fluid stirring purification jointed board preparation material and a fluid stirring purification jointed board preparation process.

Background

In the steel smelting industry, the reduction of the production cost of steel smelting and the reduction of the consumption of refractory materials becomes one of effective ways for reducing the production cost. The air brick is an important refractory material consumable in steel smelting as a common fluid stirring element, so that the air brick further improves the air permeability, the blow-through rate and other service performances, and prolongs the service life as far as possible, and becomes the development direction of the current air brick.

In the previous research work, the present inventors developed a combined fluid stirring and purifying element (as shown in fig. 1 to 3), which includes a jointed board assembly, a gas permeable base, and a peripheral brick-set castable; the jointed board assembly is formed by directly and physically superposing 4-6 prefabricated jointed boards, the outer part of the jointed board assembly is tightly connected with the peripheral sleeve brick casting material after casting, and the jointed board assembly is assembled and combined with the base. The air brick with the structure has the advantages of high blow-through rate, transverse and seepage prevention and good thermal shock resistance; compared with a peripheral sleeve brick castable, the spliced plate assembly is subjected to double impact of airflow and molten steel in the working process, so that a spliced plate assembly material formula with better slag resistance and higher thermal shock stability needs to be found, and the spliced plate assembly material formula is matched with the combined fluid stirring and purifying element for use, so that the air brick has better service performance. In addition, the ventilation effect of the jointed board assembly needs to be further improved.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to provide a fluid stirring purification jointed board preparation material and a fluid stirring purification jointed board preparation process, so as to solve the problems of poor slag resistance, poor thermal shock stability and the like of a fluid stirring purification jointed board in a current combined fluid stirring purification element, and reduce the thickness of a single jointed board as much as possible to improve the ventilation effect of the fluid stirring purification jointed board.

In order to solve the technical problems, the invention provides the following technical scheme:

a fluid stirring purification jointed board preparation material comprises the following components in parts by weight: 45 to 79 weight portions of corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 0.5 to 8 weight portions of corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 0.5 to 10 weight portions of alumina micropowder with the grain diameter of 1 to 5 mu m, 1 to 8 weight portions of bonding agent and 5 to 24 weight portions of performance enhancer.

The bonding agent is one or a combination of two or more of calcium aluminate cement, aluminum dihydrogen phosphate, phenolic resin, lignosulfonate and polyvinyl alcohol.

According to the material for preparing the fluid stirring purification jointed board, the addition amount of the calcium aluminate cement is 3-8 parts by weight, the addition amount of the aluminum dihydrogen phosphate is 1-6 parts by weight, the addition amount of the phenolic resin is 2-6 parts by weight, the addition amount of the lignosulfonate is 1-5 parts by weight, and the addition amount of the polyvinyl alcohol is 1-6 parts by weight.

The material for preparing the fluid stirring purification jointed board is characterized in that the performance enhancer is one or a combination of two or more of a chromium enhancer, magnesia-alumina spinel, high-purity magnesia, zirconia, fused mullite, modified fused mullite or calcium titanium aluminate.

The fluid stirring purification jointed board preparation material is characterized in that the chromium reinforcer is chromium corundum and/or chromium oxide micro powder; the grain size of the chromium corundum is less than or equal to 3mm, and the mass fraction of chromium oxide in the chromium corundum is 1-5 wt%; sieving the chromium oxide micro powder with a 1000-mesh sieve; the particle size of the magnesia-alumina spinel is less than or equal to 3mm, and the mass fraction of magnesia in the magnesia-alumina spinel is 5-25 wt%; the content of magnesium oxide in the high-purity magnesium oxide is more than or equal to 96wt%, and the grain diameter of the high-purity magnesium oxide is less than or equal to 1mm; the grain size of the zirconia is less than or equal to 3mm; the grain diameter of the electrofused mullite is less than or equal to 3mm, and the mass fraction of alumina in the electrofused mullite is 55-80 wt%; the grain diameters of the fused mullite used for preparing the modified fused mullite and the zirconia used for preparing the modified fused mullite are both less than or equal to 3mm, and the mass fraction of the alumina in the fused mullite is 55-80 wt%; the particle size of the calcium titanium aluminate is less than or equal to 1mm.

The fluid stirring purification jointed board preparation material comprises the following components: corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, alpha alumina micro powder with the grain diameter of 1-5 mu m, a bonding agent and a performance enhancer; the performance enhancer consists of modified fused mullite, magnesium aluminate spinel and calcium titanium aluminate; the binding agent consists of calcium aluminate cement and aluminum dihydrogen phosphate.

The fluid stirring purification jointed board preparation material comprises the following components in parts by weight: 70 parts of corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6 parts of corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5 parts of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5 parts of binding agent and 10 parts of performance enhancer; the performance enhancer consists of 5 parts by weight of modified fused mullite, 3 parts by weight of magnesia-alumina spinel and 2 parts by weight of calcium titanium aluminate; the binder consists of 3 parts by weight of calcium aluminate cement and 2 parts by weight of aluminium dihydrogen phosphate.

The preparation method of the modified electrofused mullite comprises the following steps:

step (1): uniformly mixing the electrofused mullite and the zirconia according to the mass ratio of (8-12) to 1, and ball-milling by adopting a dry ball milling method until the particle size of mixed powder is between 5 and 20 microns to obtain mixed powder;

step (2): calcining the mixed powder for 2-5 h at 800-1000 ℃, and ball-milling by adopting a dry ball milling method to obtain calcined powder with the particle size of 5-20 um;

and (3): adding boric acid powder into the calcined powder, uniformly mixing, and roasting at 500-600 ℃ to obtain modified fused mullite; the addition amount of the boric acid powder is 2-10 wt% of the weight of the calcined powder.

The liquid stirring purification splicing plate preparation material is characterized in that the corundum is one or a combination of two or more of tabular corundum, white corundum and brown corundum; the alumina micro powder is alpha alumina micro powder.

A preparation process of fluid stirring purification jointed boards comprises the following steps:

step A: adding 45-79 parts by weight of corundum with the particle size of more than 0.045mm and less than or equal to 3mm, 0.5-8 parts by weight of corundum with the particle size of more than or equal to 0.01mm and less than or equal to 0.045mm, 0.5-10 parts by weight of alumina micropowder with the particle size of 1-5 mu m, 1-8 parts by weight of binding agent and 5-24 parts by weight of performance enhancer into a stirrer in sequence, and uniformly mixing to obtain a mixed material;

and B: after the jointed board forming mold is assembled, fixing the jointed board forming mold on a vibration table, placing a burnable substance in the jointed board forming mold in advance according to the position and the size of the ventilation channel, and forming a jointed board ventilation channel or a jointed board surface groove after the burnable substance is burnt out in the burning treatment process; pouring the mixed material into a mould, and carrying out vibration molding; curing at 45-90 ℃, demoulding, and baking at 110-200 ℃ to obtain a spliced board blank;

or: assembling a jointed board forming die, placing a burnout object in the jointed board forming die in advance, uniformly filling the mixed material in the die, keeping the pressure for 10s under the pressure of 5-30 Mpa, and performing compression molding to obtain a jointed board blank;

and C: transporting the green body to sintering equipment for sintering treatment, wherein the sintering temperature is 1450-1760 ℃, the sintering time is 32-55 h, and obtaining a single spliced plate after the sintering treatment is finished;

step D: and transporting the single jointed boards to the site for installation, and assembling the single jointed boards into the fluid stirring purification jointed board on the site.

The technical scheme of the invention achieves the following beneficial technical effects:

1. according to the invention, the slag resistance and the thermal shock stability of the prepared fluid stirring purification jointed board are obviously improved by adjusting the proportion of each component in the fluid stirring purification jointed board preparation material and adding a performance enhancer in the fluid stirring purification jointed board preparation material. The slag resistance of the fluid stirring and purifying jointed board is measured by adopting a rotary slag etching method (GB/T8931-2007), and the slag etching amount is measured to be between 2.5 and 4.4 percent; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the percentage of the change of the breaking strength before and after thermal shock is between 89.4 and 95.3 percent. The fluid stirring purification jointed board prepared by the invention has excellent slag resistance and thermal shock resistance.

2. The slit groove of the single jointed board is controllable in size, so that the anti-permeability steel performance of the fluid stirring and purifying jointed board is guaranteed, and the air permeability can meet the requirement. In the production and use processes, the jointed board is not easy to deform, the deformation amount of the ventilation slit is very small, the deformation amount of the slit in the prior art is about 50%, and the deformation amount of the slit in the production and use processes of the jointed board slit is not higher than 15%. In addition, the mode of combining the jointed plates can ensure that the fluid stirring and purifying body only can be partially transversely cut and peeled off in the using process, and the air permeability is not influenced by the integral transverse cutting and peeling of the large blocks.

3. On the premise that the installation space of the fluid stirring purification jointed boards is certain, in order to form more air permeable channels (namely to accommodate more fluid stirring purification jointed boards) among the fluid stirring purification jointed boards, the invention further optimizes the components and the addition proportion of the performance enhancer and modifies the electric smelting mullite, so that the thickness of a single jointed board can be effectively reduced, and a large number of jointed boards can be accommodated in the installation space of the fluid stirring purification jointed boards, thereby forming more air permeable channels; the optimized splice material can enable a single splice plate obtained by preparation to meet the performance requirements of mechanical mechanics, thermodynamics, no gas leakage among splice plates and the like in the preparation, installation and service processes of the splice plate under the condition of small thickness.

4. The zirconium-based material and the corundum which is the main component of the jointed board have different thermal expansion coefficients, and are easy to generate microcracks at high temperature, and the microcracks can absorb and disperse energy generated by main cracks in the jointed board main body, so that stress generated in the service process of the jointed board is dispersed, the thermal shock resistance of the jointed board is improved, but the improvement of the toughness of the jointed board by using zirconia is limited; in order to prepare thinner jointed boards and ensure that no gas is mixed between the jointed boards, the invention modifies the fused mullite, when preparing the modified fused mullite, the fused mullite is modified by adding zirconia balls for grinding, then calcining, adding boric acid for roasting after ball milling of calcined products and the like, and the modified fused mullite and other components interact to generate substances which are more beneficial to improving the mechanical and thermodynamic properties of the jointed boards during the sintering treatment, thereby greatly reducing the thickness of the jointed boards. In addition, the zirconium-based material has stronger corrosion resistance, and can enable the zirconium oxide and the fused mullite to better exert slag resistance and toughness after the fused mullite is modified.

5. In the process of manufacturing the jointed board, the minimum thickness of the jointed board to be manufactured needs to consider the influence of various factors on the performance of the intermediate product of the jointed board in the whole manufacturing process, such as the processes of pressing forming, transporting, firing, transporting to the field installation after firing and the like, besides whether the mechanical and mechanical properties such as strength and the like and the thermodynamic properties of the jointed board after sintering and forming can meet the use requirements. According to the invention, the negative influence of adverse factors on the product performance of the jointed board can be resisted in the whole preparation process by adjusting the types of the components and the proportion of the components, so that the jointed board with small thickness and good use performance can be prepared.

Drawings

FIG. 1 is a front view of a combined fluid agitating purification element of the background art;

FIG. 2 is a top cross-sectional view of a combined fluid agitating purification element of the background art;

FIG. 3 is a schematic view of a single panel of a modular fluid mixing and purification element of the prior art.

In the figures, the reference numbers are given by: 1-sleeving bricks; 2-internal gas channels of the jointed boards; 3-a jointed board assembly; 4-splicing plate combined gas channel; 5-a metal housing; 6-refractory mortar layer; 7-air chamber on the base; 8-a base; 9-air chamber under the base; 10-a metal base plate; 11-a metal tailpipe; 12-single puzzle piece anchoring grooves; 13-Single panel.

Detailed Description

Example 1

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 78kg of tabular corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 8kg of brown corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 8kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 8kg of binding agent and 18kg of performance enhancer; the performance enhancer is chrome corundum, the grain size of the chrome corundum is less than or equal to 3mm, the mass fraction of chromium oxide in the chrome corundum is 5wt%, the bonding agent is calcium lignosulphonate, the pH value of the calcium lignosulphonate is 6, and the content of lignin in the calcium lignosulphonate is 55wt%.

The preparation process for preparing the fluid stirring purification jointed board by adopting the fluid stirring purification jointed board preparation material comprises the following steps:

step A: sequentially adding the components into a stirrer, and uniformly mixing to obtain a mixed material;

and B, step B: after the jointed board forming mold is assembled, fixing the jointed board forming mold on a vibrating table, placing a burnout object in the jointed board forming mold in advance, and forming a jointed board ventilation channel or a jointed board surface groove after the burnout object is burnt out in the burning treatment process; pouring the mixed material into a mould, and carrying out vibration molding; curing at 60 ℃, demoulding, and baking at 180 ℃ to obtain a spliced board blank; ( In other embodiments, a jointed board blank can also be obtained by adopting machine pressing, and the operation method comprises the following steps: assembling the jointed board forming mold, placing the burnable substance in the jointed board forming mold in advance, uniformly filling the mixed material in the mold, maintaining the pressure for 10s under the pressure of 10Mpa, and performing compression molding to obtain a jointed board blank )

And C: transporting the jointed board blank to sintering equipment for sintering treatment to obtain a single jointed board; the conditions of the firing treatment are as follows: the firing temperature is 1450 ℃, and the firing time is 55h;

step D: and transporting the single jointed boards to the site for installation, and assembling the single jointed boards into the fluid stirring purification jointed board on the site.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 3.7% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 89.4%. In addition, 18kg of the chrome corundum in the embodiment can be replaced by 6kg of chromium oxide fine powder which is sieved by a 1000-mesh sieve, and the chrome corundum can be generated in situ after the chromium oxide fine powder is added and then is subjected to a sintering treatment, so that the equivalent technical effect is desirable.

Example 2

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 45kg of white corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 1kg of brown corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 4kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 3kg of binding agent and 10kg of performance enhancer; the performance enhancer is magnesium aluminate spinel, the particle size of the magnesium aluminate spinel is less than or equal to 3mm, and the mass fraction of magnesium oxide in the magnesium aluminate spinel is 25wt%; the binding agent is calcium aluminate cement with the alumina content of 71 percent.

The fluid stirring purification panel preparation material of this example was prepared into a fluid stirring purification panel using the same preparation process as in example 1.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 3.3% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 90.1%. On the basis of the embodiment, high-purity magnesium oxide with the magnesium oxide content of less than or equal to 5kg and more than 96wt% can be added as a performance enhancer, so that the slag resistance of the fluid stirring and purifying jointed board can be further improved.

Example 3

The fluid stirring purification plate alignment preparation material of the embodiment comprises the following components: 54kg of tabular corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 2kg of white corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 0.5kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 1kg of binding agent and 5kg of performance enhancer; the performance enhancer is zirconia with the grain diameter less than or equal to 3mm, and the binding agent is aluminum dihydrogen phosphate.

The fluid mixing purification panel preparation material of this example was prepared into a fluid mixing purification panel using the same preparation process as in example 1.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 4.1% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 89.9%.

Example 4

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 70kg of brown corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6kg of brown corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5kg of binding agent and 10kg of performance enhancer; the performance enhancer is fused mullite, the grain diameter of the fused mullite is less than or equal to 3mm, and the mass fraction of alumina in the fused mullite is 65wt%; the binder consists of 3kg of calcium aluminate cement and 2kg of aluminium dihydrogen phosphate.

The fluid stirring purification panel preparation material of this example was prepared into a fluid stirring purification panel using the same preparation process as in example 1.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 3.9% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 91.9%.

Example 5

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 70kg of white corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6kg of white corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5kg of binding agent and 8kg of performance enhancer; the performance enhancer is calcium titanium aluminate, and the particle size of the calcium titanium aluminate is less than or equal to 1mm; the binding agent consists of 2kg of phenolic resin and 3kg of polyvinyl alcohol; the phenolic resin is a commercially available liquid resol; the molecular weight of the polyvinyl alcohol is 11-13 ten thousand.

The fluid stirring purification panel preparation material of this example was prepared into a fluid stirring purification panel using the same preparation process as in example 1.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 4.4% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 90.5%.

Under the condition that the placing space volume of the ventilating brick fluid stirring and purifying jointed boards is certain, the thinner the single jointed board is, the more the number of the jointed boards is, and under the condition that the number of the ventilating grooves on the surfaces of the jointed boards is certain, the better the blowing effect is towards the interior of the steel ladle. Therefore, in order to reduce the thickness of the panels and ensure that there is no outgassing between the panels, the applicant has optimized the raw materials for producing the panels.

Example 6

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 70kg of brown corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6kg of brown corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5kg of binding agent and 10kg of performance enhancer; the performance enhancer is modified electrofused mullite, and the grain diameter of the modified electrofused mullite is less than or equal to 3mm; the binder consists of 3kg of calcium aluminate cement and 2kg of aluminium dihydrogen phosphate.

The preparation method of the modified electrofused mullite in the embodiment comprises the following steps:

step (1): uniformly mixing the fused mullite and the zirconia according to the mass ratio of 10; the grain diameter of the raw material of the fused mullite is less than or equal to 3mm, and the mass fraction of alumina in the fused mullite is 65wt%; the grain size of the zirconia is less than or equal to 3mm;

step (2): calcining the mixed powder at 950 ℃ for 3h, and ball-milling by a dry ball milling method to obtain calcined powder with the particle size of 5-20 um;

and (3): adding boric acid powder into the calcined powder, uniformly mixing, and roasting at 600 ℃ to obtain modified fused mullite; the adding amount of the boric acid powder is 8wt% of the mass of the calcined powder.

The fluid stirring purification panel preparation material of this example was prepared into a fluid stirring purification panel using the same preparation process as in example 1. The zirconium-based material and the corundum which is the main component of the jointed board have different thermal expansion coefficients, and are easy to generate microcracks at high temperature, and the microcracks can absorb and disperse energy generated by main cracks in the jointed board main body, so that stress generated in the service process of the jointed board is dispersed, the thermal shock resistance of the jointed board is improved, but the improvement of the toughness of the jointed board by using zirconia is limited; in order to prepare thinner jointed boards and ensure that no gas is mixed between the jointed boards, the embodiment modifies the fused mullite, when the modified fused mullite is prepared, the fused mullite is modified by adding zirconia balls for grinding, then calcining, adding boric acid for roasting after the calcined product is ball-milled and the like, and the modified fused mullite and other components interact with each other during the sintering treatment to generate substances which are more beneficial to improving the mechanical and thermodynamic properties of the jointed boards, so that the thickness of the jointed boards is greatly reduced. In addition, the zirconium-based material has stronger corrosion resistance, and the zirconia and the fused mullite can better exert slag resistance and toughness after being modified.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 3.1% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance of the material is measured by adopting a long strip test method (YB 4018-91) in China, and the breaking strength retention rate before and after thermal shock is 94.1 percent. The minimum thickness of the single panels prepared in this example was reduced by 18.3% relative to example 4. Compared with the fluid stirring purification jointed board prepared in the embodiment 4, the thickness of a single jointed board is obviously reduced, the ventilation effect is improved, and the phenomenon of air leakage among the jointed boards cannot be caused in the using process.

Example 7

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 70kg of brown corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6kg of brown corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5kg of binding agent and 10kg of performance enhancer; the performance enhancer consists of 6kg of modified fused mullite and 4kg of magnesia alumina spinel, the particle size of the modified fused mullite is less than or equal to 3mm, the particle size of the magnesia alumina spinel is less than or equal to 3mm, and the mass fraction of magnesium oxide in the magnesia alumina spinel is 25wt%; the binder consists of 3kg of calcium aluminate cement and 2kg of aluminium dihydrogen phosphate.

The preparation method of the modified fused mullite used in this example is the same as that in example 6, and the fluid stirring purification panel preparation material of this example is prepared into a fluid stirring purification panel by the same preparation process as that in example 1.

The slag resistance of the fluid stirring purification jointed board of the embodiment is measured by adopting a 7-rotation slag etching method in GB/T8931-2007, and the slag etching rate is measured to be 2.9% at 1550 ℃, the furnace body rotation rate is 5r/min, the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 94.5%. The minimum thickness of the monolithic panels produced in this example was reduced by 20.7% relative to that of example 4. Compared with the fluid stirring purification jointed board prepared in the embodiment 4, the thickness of a single jointed board is obviously reduced, the ventilation effect is improved, and the phenomenon of air leakage among the jointed boards cannot be caused in the using process.

Example 8

The fluid stirring purification jointed board preparation material of the embodiment is composed of the following components: 70kg of brown corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6kg of brown corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5kg of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5kg of binding agent and 10kg of performance enhancer; the performance enhancer consists of 5kg of modified fused mullite, 3kg of magnesia-alumina spinel and 2kg of calcium titanate aluminate, the particle size of the modified fused mullite is less than or equal to 3mm, the particle size of the magnesia-alumina spinel is less than or equal to 3mm, the mass fraction of magnesium oxide in the magnesia-alumina spinel is 25wt%, and the particle size of the calcium titanate aluminate is less than or equal to 1mm; the binder consists of 3kg of calcium aluminate cement and 2kg of aluminium dihydrogen phosphate.

The preparation method of the modified fused mullite used in this example is the same as that in example 6, and the fluid stirring purification panel preparation material of this example is prepared into a fluid stirring purification panel by the same preparation process as that in example 1.

The slag resistance of the fluid stirring and purifying jointed board of the embodiment is measured by adopting a 7-rotation slag corrosion method in GB/T8931-2007, and the slag corrosion rate is measured to be 2.5% at 1550 ℃, the furnace body rotation rate is 5r/min, and the duration is 40 h; the thermal shock resistance is measured by adopting a national strip test method (YB 4018-91), and the breaking strength retention rate before and after thermal shock is 95.3%. The minimum thickness of the monolithic panels produced in this example was reduced by 22.1% relative to that of example 4. The reason is probably that substances which are more beneficial to improving the mechanical and thermodynamic properties of the jointed boards are generated by the interaction of the modified electric-melting mullite and other components during the firing treatment, so that the thickness of the jointed boards is greatly reduced, and the problem of gas leakage among the jointed boards is not easy to occur even if the thickness of the jointed boards is small in the preparation and use processes.

The proportions of the components of the fluid stirred and purified panel preparation materials in examples 1 to 8 are shown in Table 1.

TABLE 1

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.

Claims (8)

1. A fluid stirring purification jointed board preparation material is characterized by comprising the following components in parts by weight: 45 to 79 parts by weight of corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 0.5 to 8 parts by weight of corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 0.5 to 10 parts by weight of alumina micropowder with the grain diameter of 1 to 5 mu m, 1 to 8 parts by weight of bonding agent and 5 to 24 parts by weight of performance enhancer;

the performance enhancer is formed by combining modified electric-melting mullite with one or more than two of chromium enhancer, magnesia-alumina spinel, high-purity magnesia, zirconia, electric-melting mullite or calcium titanium aluminate;

the preparation method of the modified electrofused mullite comprises the following steps:

step (1): uniformly mixing the electrofused mullite and the zirconia according to the mass ratio of (8-12) to 1, and ball-milling by adopting a dry ball milling method until the particle size of mixed powder is between 5 and 20 microns to obtain mixed powder;

step (2): calcining the mixed powder for 2-5 h at 800-1000 ℃, and ball-milling by a dry ball milling method to obtain calcined powder with the particle size of 5-20 um;

and (3): adding boric acid powder into the calcined powder, uniformly mixing, and roasting at 500-600 ℃ to obtain modified fused mullite; the addition amount of the boric acid powder is 2-10 wt% of the weight of the calcined powder.

2. The material for preparing the fluid stirring purification jointed board according to claim 1, wherein the binder is one or a combination of two or more of calcium aluminate cement, aluminum dihydrogen phosphate, phenolic resin, lignosulfonate and polyvinyl alcohol.

3. The material for preparing the fluid stirring purification jointed board according to claim 2, wherein the calcium aluminate cement is added in an amount of 3 to 8 parts by weight, the aluminum dihydrogen phosphate is added in an amount of 1 to 6 parts by weight, the phenolic resin is added in an amount of 2 to 6 parts by weight, the lignosulfonate is added in an amount of 1 to 5 parts by weight, and the polyvinyl alcohol is added in an amount of 1 to 6 parts by weight.

4. The material for preparing the fluid stirring purification jointed boards according to claim 1, wherein the chromium reinforcer is chromium corundum and/or chromium oxide micro powder; the grain diameter of the chromium corundum is less than or equal to 3mm, and the mass fraction of chromium oxide in the chromium corundum is 1-5 wt%; sieving the chromium oxide micro powder with a 1000-mesh sieve; the particle size of the magnesia-alumina spinel is less than or equal to 3mm, and the mass fraction of magnesia in the magnesia-alumina spinel is 5-25 wt%; the content of magnesium oxide in the high-purity magnesium oxide is more than or equal to 96wt%, and the grain diameter of the high-purity magnesium oxide is less than or equal to 1mm; the grain size of the zirconia is less than or equal to 3mm; the grain diameter of the electrofused mullite is less than or equal to 3mm, and the mass fraction of alumina in the electrofused mullite is 55-80 wt%; the grain diameters of the fused mullite used for preparing the modified fused mullite and the zirconia used for preparing the modified fused mullite are both less than or equal to 3mm, and the mass fraction of the alumina in the fused mullite is 55-80 wt%; the particle size of the calcium titanium aluminate is less than or equal to 1mm.

5. The fluid stirring purification plate alignment preparation material as claimed in claim 1, which is composed of the following components: corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, alpha alumina micro powder with the grain diameter of 1-5 mu m, a bonding agent and a performance enhancer; the performance enhancer consists of modified electric-melting mullite, magnesia-alumina spinel and calcium titanium aluminate; the binding agent consists of calcium aluminate cement and aluminum dihydrogen phosphate.

6. The fluid stirring purification plate alignment preparation material as claimed in claim 5, which is composed of the following components in parts by weight: 70 parts of corundum with the grain diameter of more than 0.045mm and less than or equal to 3mm, 6 parts of corundum with the grain diameter of more than or equal to 0.01mm and less than or equal to 0.045mm, 5 parts of alpha alumina micropowder with the grain diameter of 1-5 mu m, 5 parts of binding agent and 10 parts of performance enhancer; the performance enhancer consists of 5 parts by weight of modified fused mullite, 3 parts by weight of magnesia-alumina spinel and 2 parts by weight of calcium titanium aluminate; the binder consists of 3 parts by weight of calcium aluminate cement and 2 parts by weight of aluminium dihydrogen phosphate.

7. The material for preparing the fluid stirring purification jointed board according to any one of claims 1 to 4, wherein the corundum is one or a combination of two or more of tabular corundum, white corundum and brown corundum; the alumina micro powder is alpha alumina micro powder.

8. A process for preparing a fluid stirring purification jointed board, which is characterized in that the material for preparing the fluid stirring purification jointed board as described in any one of claims 1-7 is adopted, and comprises the following steps:

step A: adding 45-79 parts by weight of corundum with the particle size of more than 0.045mm and less than or equal to 3mm, 0.5-8 parts by weight of corundum with the particle size of more than or equal to 0.01mm and less than or equal to 0.045mm, 0.5-10 parts by weight of alumina micropowder with the particle size of 1-5 mu m, 1-8 parts by weight of binding agent and 5-24 parts by weight of performance enhancer into a stirrer in sequence, and uniformly mixing to obtain a mixed material;

and B: after the jointed board forming mold is assembled, fixing the jointed board forming mold on a vibration table, and placing a burnout object in the jointed board forming mold in advance; pouring the mixed material into a mould, and carrying out vibration molding; curing at 45-90 ℃, demoulding, and baking at 110-200 ℃ to obtain a spliced board blank;

or: assembling a jointed board forming die, placing a burnout object in the jointed board forming die in advance, uniformly filling the mixed material in the die, keeping the pressure for 10s under the pressure of 5-30 Mpa, and performing compression molding to obtain a jointed board blank;

and C: conveying the jointed board blank to sintering equipment for sintering treatment, wherein the sintering temperature is 1450-1760 ℃, the sintering time is 32-55 h, and obtaining a single jointed board after the sintering treatment is finished;

step D: and transporting the single jointed boards to the site for installation, and assembling the single jointed boards into the fluid stirring purification jointed board on the site.

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