CN103553703A - Preparation method of novel ceramic filter layer for high-temperature dust removal - Google Patents
Preparation method of novel ceramic filter layer for high-temperature dust removal Download PDFInfo
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Abstract
The invention relates to a preparation method of a novel ceramic filter layer for high-temperature dust removal. The method is characterized by comprising the following steps of (1) preparing a light ceramic filter material by utilizing red mud as a main raw material, wherein the raw material comprises the following ingredients by weight percent: 60 to 80 percent of red mud, 8 to 20 percent of potassium feldspar, 2 to 8 percent of soda feldspar and 10 to 20 percent of kaolin; externally adding the pore-forming agent, wherein the addition quantity of the pore-forming agent is 15 to 30 percent of the gross mass of the red mud, potassium feldspar, the sodium feldspar and the kaolin; 2) preparing a heavy ceramic filter material by utilizing andalusite, wherein the raw material comprises the following ingredients by weight percent: 50 to 70 percent of andalusite, 8 to 15 percent of potassium feldspar, 5 to 20 percent of the sodium feldspar, 15 to 30 percent of bauxite and 2 to 10 percent of sodium borate; 3) utilizing the two ceramic filter materials to form a novel ceramic filter layer, and obtaining a novel ceramic filter layer. When being used in a high-temperature environment, the filter layer is high in strength, unlikely for powder dropping, large in adjustment range of density, apparent porosity and the like and unlikely to mix.
Description
Technical field
That the present invention relates to is the preparation method of the Novel filtration layer (bed) constructed of two kinds of ceramic filter materials utilizing red mud and andaluzite to prepare for main raw material, for the dust removal by filtration of high-temperature flue gas, belongs to environmental protection and field of new.
Background technology
granular-layer dust precipitatoraspect the dust of the high-temperature flue gas producing in industry such as removal iron and steel, metallurgy, electric power and building materials, there is unique advantage.Its dust-cleaning principle is: filtering layer (bed) is by thick and light (upper strata) and the double-layer filter material that carefully weighs (lower floor) form.During filtration, the high-temperature flue gas of dust-laden is from top to bottom through filtering layer.First through thick compared with the upper strata filtrate of light grains, the most dust in entrap gas, then through the filtrate lower floor of thinner heavier particle, intercept and capture the fine dust that leaked filtering layer.The different two-layer step of this thickness weight filters, and can obtain higher filtration efficiency and low pressure drop simultaneously.For filtering layer after the blowback still upper coarse and lower fine double-layer structure of stable maintenance, be necessary to construct filtering layer (bed) with two kinds of different filtrates of density.
current granular-layer dust precipitator double-layer filter material used, general upper strata is pearlstone, lower floor is extra large sand or quartz sand.The slag of the dissimilar and particle diameter of the use that also has or rubble or gravel are as filtrate.Chinese invention patent < < grain bed gas-filtering device and screening and dedusting method > > (CN102019118A) thereof adopt the quartz sand of pearlstone, 150～200 orders and 0.3 ~ 0.5mm of 1 ~ 1.5mm as filtering layer; The levels filtrate adopting in research > > mono-literary composition of < < double-layer filter material Bed Filtration novel dedusting method is respectively, particle diameter is the pearlstone of 2～5mm and the extra large sand (Yang Guohua etc. that particle diameter is 0.5～1mm, power engineering, 2005 (6), 891-894); The levels filtrate adopting in application > > mono-literary composition of the two filtering layer grain bed hot precipitators of < < on aluminium alloy smelting flue gas ash removal is respectively, particle diameter is 2～5mm, and unit weight is 70kg/m
3pearlstone and particle diameter be 0.5～1mm, unit weight is 1400kg/m
3quartz sand (Wang Xingyun etc., Lw2010 aluminium section bar technology (world) forum collected works, 2010,132-134); A kind of use rubble and quartz sand in < < The influence of granular flow rate on the performance of a moving bed granular filter > > mono-literary composition, have been introduced as filtering layer (the Ibrahim A. El-Hedok et al of filtrate, Powder Technology, 2011 (214), 69-76).U.S. patent of invention < < METHOD OF RECOVERING FUEI FROM COAL ASH > > (US4657501) is disclosed is to use sand and gravel as granular layer filtrate.The filtering layer that above-mentioned natural filtering material is constructed is in actual use procedure, in particularly blowback process, and the lower easy dry linting of intensity, and the regulation range such as its proportion and porosity is less, easy mixed layer, thus have a strong impact on the dust-filtering effect of high-temperature flue gas.
summary of the invention:
The preparation method who the object of this invention is to provide a kind of new ceramics filtering layer for high-temperature dust removal, this filtering layer intensity in hot environment use procedure is high, is difficult for dry linting.
To achieve these goals, the technical solution used in the present invention is that a kind of preparation method of the new ceramics filtering layer for high-temperature dust removal, is characterized in that it comprises the following steps:
1) utilize red mud to prepare light ceramics filtrate for main raw material,
1.. feed proportioning: raw material is weighed to proportioning by following weight percentage: red mud 60-80%, potassium felspar sand 8-20%, albite 2-8%, kaolin 10-20%; Additional pore former, the add-on of pore former is the 15-30% of red mud, potassium felspar sand, albite and kaolin total mass, described pore former is coal dust or graphite;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 3 ~ 10 hours with ball mill, and wherein red mud, potassium felspar sand, albite and kaolin are crossed 250 orders, and pore former is crossed 180 orders, are then mixed to get blank in mixer, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water (being that blank and water are alternately put into), base ball is progressively grown up, and forms the base ball of diameter 3 ~ 6mm; The total amount that adds of water is the 6-8% of blank total mass; The base ball of producing is put into dry 12 ~ 24 hours of the hot-air drier of 80 ~ 120 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1120 ~ 1200 ℃, burn till (3 ~ 5 ℃/min of temperature rise rate, firing time 10 ~ 15h), obtain diameter 2.5 ~ 5.2mm light ceramics filtrate (red mud light filter material) (apparent porosity 60% ~ 70%, density 0.5 ~ 0.9 g/cm of wear-resisting not dry linting
3, crushing strength 5 ~ 13MPa);
2)
utilize andaluzite to prepare heavy ceramic filter material,
1. feed proportioning: raw material is weighed to proportioning by following weight percentage: andaluzite 50 ~ 70%, potassium felspar sand 8 ~ 15%, albite 5 ~ 20%, bauxitic clay 15 ~ 30%, borax 2 ~ 10%;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 6 ~ 24 hours with ball mill, cross 250 orders, then in mixer, be mixed to get blank, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 1.0 ~ 2.5mm; The total amount that adds of water is the 6-8% of blank total mass; The base ball of producing is put into dry 12 ~ 24 hours of the hot-air drier of 80 ~ 120 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1320 ~ 1400 ℃, burns till
(3 ~ 5 ℃/min of temperature rise rate, firing time 16 ~ 20h
), obtain 0.8 ~ 2.0mm heavy ceramic filter material (or claim andaluzite heavy filtrate) (water-intake rate below 1%, the density 2.5 ~ 3.5g/cm of wear-resisting not dry linting
3, crushing strength 30 ~ 40MPa);
3)
utilize above-mentioned two kinds of ceramic filter materials to construct new ceramics filtering layer,
In granular-layer dust precipitator Zhong， lower floor, first lay the heavy ceramic filter material (lower floor) that utilizes andaluzite to prepare, laying depth is 1/4th to 1/3rd of filtering layer total thickness; And then the light ceramics filtrate (upper strata) that utilizes red mud to prepare, laying depth is 3/4ths to 2/3rds of filtering layer total thickness, with this, constructs new ceramics filtering layer.
Its upper strata of the present invention is the light ceramics filtrate that utilizes red mud to prepare, and lower floor is the heavy ceramic filter material that utilizes andaluzite to prepare.These two kinds of filtering layers that ceramic filter material is constructed, in hot environment use procedure, intensity is high, is difficult for dry linting, and the regulation range such as its density and apparent porosity is larger, be difficult for mixed layer, can be widely used in the high-temperature flue gas purification that the industry such as iron and steel, metallurgy, electric power, building materials produce.Such as, new ceramics filtering layer be used for filtering cement mill ash-laden gas (150 ~ 200 ℃, dust content 200 ~ 500mg/Nm
3) time, exhanst gas outlet dust content < 20 mg/Nm
3, lower than the emission standard of national regulation, and need not supplement in two years ceramic filter material (being difficult for dry linting).
the invention has the beneficial effects as follows:
1.
filtering layer operating performance is better.light ceramics filtrate prepared by the present invention (red mud light filter material) and heavy ceramic filter material (or claiming andaluzite heavy filtrate), there is adjustable in a big way apparent porosity, density and higher physical strength, therefore the ceramic filter layer that they are constructed can obtain higher filtration efficiency and low pressure drop while filtering high-temperature flue gas simultaneously, compare with the filtering layer that pearlstone is constructed with other materials such as quartz sands, operating performance is good and more stable.
3.
filtering layer running cost is lower.the heavy filtrate physical strength of red mud light weight filtrate prepared by the present invention and andaluzite matter is high
(light filter material crushing strength 5 ~ 13MPa, heavy filtrate crushing strength 30 ~ 40MPa) and high temperature resistant (heat-resisting 800 ℃ of light filter material, heat-resisting 1100 ℃ of heavy filtrate), dry linting not when the ceramic filter layer that therefore they are constructed moves particularly pulse backblowing, the operation several years need not be supplemented filtrate, compare with the filtering layer that pearlstone is constructed with other materials such as quartz sands, at least save every year 1/3rd running cost.
In addition, because red mud is a kind of waste material of aluminum oxide industry, the present invention uses its raw material as light ceramics filtrate, so the present invention consumes the meaning of waste material, promotion environmental protection in addition.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-heat-resisting steel sheet and plate, 2-light ceramics filtrate (thick and light ceramic filter material), 3-heavy ceramic filter material (thin and heavy ceramic filter material), 4-supporting layer and air distribution plate.H represents the total thickness of new ceramics filtering layer.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.
Embodiment 1
A preparation method for the new ceramics filtering layer of high-temperature dust removal, it comprises the following steps:
1) utilize red mud to prepare light ceramics filtrate for main raw material,
1.. feed proportioning: raw material is weighed to proportioning by following weight percentage: red mud 60%, potassium felspar sand 20%, albite 8%, kaolin 12%; Additional pore former, the add-on of pore former is 15% of red mud, potassium felspar sand, albite and kaolin total mass, described pore former is coal dust;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 3 hours with ball mill, and wherein red mud, potassium felspar sand, albite and kaolin are crossed 250 orders, and pore former is crossed 180 orders, are then mixed to get blank in mixer, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2mm, then alternately put into blank and water (being that blank and water are alternately put into), base ball is progressively grown up, and forms the base ball of diameter 3mm; The total amount that adds of water is 6% of blank total mass; The base ball of producing is put into dry 12 hours of the hot-air drier of 80 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1120 ℃, burn till (5 ℃/min of temperature rise rate, firing time 10h), obtain diameter 2.5mm light ceramics filtrate (red mud light filter material) (apparent porosity 60% ~ 70%, density 0.5 ~ 0.9 g/cm of wear-resisting not dry linting
3, crushing strength 5 ~ 13MPa);
2)
utilize andaluzite to prepare heavy ceramic filter material,
1. feed proportioning: raw material is weighed to proportioning by following weight percentage: andaluzite 50%, potassium felspar sand 15%, albite 10%, bauxitic clay 15%, borax 10%;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 6 hours with ball mill, cross 250 orders, then in mixer, be mixed to get blank, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 1.0mm; The total amount that adds of water is 6% of blank total mass; The base ball of producing is put into dry 12 hours of the hot-air drier of 80 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1320 ℃, burn till (5 ℃/min of temperature rise rate, firing time 16h), obtain 0.8mm heavy ceramic filter material (or claim andaluzite heavy filtrate) (water-intake rate below 1%, the density 2.5 ~ 3.5g/cm of wear-resisting not dry linting
3, crushing strength 30 ~ 40MPa);
3)
utilize above-mentioned two kinds of ceramic filter materials to construct new ceramics filtering layer,
In granular-layer dust precipitator Zhong， lower floor, first lay the heavy ceramic filter material (lower floor) that utilizes andaluzite to prepare, laying depth is 1/3rd of filtering layer total thickness; And then the light ceramics filtrate (upper strata) that utilizes red mud to prepare, laying depth is 2/3rds of filtering layer total thickness, with this, constructs new ceramics filtering layer (seeing accompanying drawing 1).
This new ceramics filtering layer be used for filtering cement mill ash-laden gas (150 ~ 200 ℃, dust content 200 ~ 500mg/Nm
3) time, exhanst gas outlet dust content < 20 mg/Nm
3, lower than the emission standard of national regulation, and need not supplement in two years ceramic filter material (being difficult for dry linting).
embodiment 2
A preparation method for the new ceramics filtering layer of high-temperature dust removal, it comprises the following steps:
1) utilize red mud to prepare light ceramics filtrate for main raw material,
1.. feed proportioning: raw material is weighed to proportioning by following weight percentage: red mud 60%, potassium felspar sand 12%, albite 8%, kaolin 20%; Additional pore former, the add-on of pore former is 30% of red mud, potassium felspar sand, albite and kaolin total mass, described pore former is graphite;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 10 hours with ball mill, and wherein red mud, potassium felspar sand, albite and kaolin are crossed 250 orders, and pore former is crossed 180 orders, are then mixed to get blank in mixer, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.5mm, then alternately put into blank and water (being that blank and water are alternately put into), base ball is progressively grown up, and forms the base ball of diameter 6mm; The total amount that adds of water is 8% of blank total mass; The base ball of producing is put into dry 24 hours of the hot-air drier of 120 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1200 ℃, burn till (5 ℃/min of temperature rise rate, firing time 15h), obtain diameter 5.2mm light ceramics filtrate (red mud light filter material) (apparent porosity 60% ~ 70%, density 0.5 ~ 0.9 g/cm of wear-resisting not dry linting
3, crushing strength 5 ~ 13MPa);
2)
utilize andaluzite to prepare heavy ceramic filter material,
1. feed proportioning: raw material is weighed to proportioning by following weight percentage: andaluzite 50%, potassium felspar sand 8%, albite 10%, bauxitic clay 30%, borax 2%;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 24 hours with ball mill, cross 250 orders, then in mixer, be mixed to get blank, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.5mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 2.5mm; The total amount that adds of water is 8% of blank total mass; The base ball of producing is put into dry 24 hours of the hot-air drier of 120 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1400 ℃, burn till (5 ℃/min of temperature rise rate, firing time 20h), obtain 2.0mm heavy ceramic filter material (or claim andaluzite heavy filtrate) (water-intake rate below 1%, the density 2.5 ~ 3.5g/cm of wear-resisting not dry linting
3, crushing strength 30 ~ 40MPa);
3)
utilize above-mentioned two kinds of ceramic filter materials to construct new ceramics filtering layer,
In granular-layer dust precipitator Zhong， lower floor, first lay the heavy ceramic filter material (lower floor) that utilizes andaluzite to prepare, laying depth is 1/4th of filtering layer total thickness; And then the light ceramics filtrate (upper strata) that utilizes red mud to prepare, laying depth is 3/4ths of filtering layer total thickness, with this, constructs new ceramics filtering layer.
This new ceramics filtering layer be used for filtering cement mill ash-laden gas (150 ~ 200 ℃, dust content 200 ~ 500mg/Nm
3) time, exhanst gas outlet dust content < 20 mg/Nm
3, lower than the emission standard of national regulation, and need not supplement in two years ceramic filter material (being difficult for dry linting).
embodiment 3
A preparation method for the new ceramics filtering layer of high-temperature dust removal, it comprises the following steps:
1) utilize red mud to prepare light ceramics filtrate for main raw material,
1.. feed proportioning: raw material is weighed to proportioning by following weight percentage: red mud 80%, potassium felspar sand 8%, albite 2%, kaolin 10%; Additional pore former, the add-on of pore former is 20% of red mud, potassium felspar sand, albite and kaolin total mass, described pore former is coal dust;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 6 hours with ball mill, and wherein red mud, potassium felspar sand, albite and kaolin are crossed 250 orders, and pore former is crossed 180 orders, are then mixed to get blank in mixer, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water (being that blank and water are alternately put into), base ball is progressively grown up, and forms the base ball of diameter 3 ~ 6mm; The total amount that adds of water is 7% of blank total mass; The base ball of producing is put into dry 20 hours of the hot-air drier of 100 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1150 ℃, burn till (5 ℃/min of temperature rise rate, firing time 12h), obtain diameter 2.5 ~ 5.2mm light ceramics filtrate (red mud light filter material) (apparent porosity 60% ~ 70%, density 0.5 ~ 0.9 g/cm of wear-resisting not dry linting
3, crushing strength 5 ~ 13MPa);
2)
utilize andaluzite to prepare heavy ceramic filter material,
1. feed proportioning: raw material is weighed to proportioning by following weight percentage: andaluzite 70%, potassium felspar sand 8%, albite 5%, bauxitic clay 15%, borax 2%;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 20 hours with ball mill, cross 250 orders, then in mixer, be mixed to get blank, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 1.0 ~ 2.5mm; The total amount that adds of water is 7% of blank total mass; The base ball of producing is put into dry 20 hours of the hot-air drier of 100 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1350 ℃, burn till (5 ℃/min of temperature rise rate, firing time 17h), obtain 0.8 ~ 2.0mm heavy ceramic filter material (or claim andaluzite heavy filtrate) (water-intake rate below 1%, the density 2.5 ~ 3.5g/cm of wear-resisting not dry linting
3, crushing strength 30 ~ 40MPa);
3)
utilize above-mentioned two kinds of ceramic filter materials to construct new ceramics filtering layer,
In granular-layer dust precipitator Zhong， lower floor, first lay the heavy ceramic filter material (lower floor) that utilizes andaluzite to prepare, laying depth is 1/2nd of filtering layer total thickness; And then the light ceramics filtrate (upper strata) that utilizes red mud to prepare, laying depth is 1/2nd of filtering layer total thickness, with this, constructs new ceramics filtering layer.
This new ceramics filtering layer be used for filtering cement mill ash-laden gas (150 ~ 200 ℃, dust content 200 ~ 500mg/Nm
3) time, exhanst gas outlet dust content < 20 mg/Nm
3, lower than the emission standard of national regulation, and need not supplement in two years ceramic filter material (being difficult for dry linting).
embodiment 4
A preparation method for the new ceramics filtering layer of high-temperature dust removal, it comprises the following steps:
1) utilize red mud to prepare light ceramics filtrate for main raw material,
1.. feed proportioning: raw material is weighed to proportioning by following weight percentage: red mud 70%, potassium felspar sand 10%, albite 5%, kaolin 10%; Additional pore former, the add-on of pore former is 20% of red mud, potassium felspar sand, albite and kaolin total mass, described pore former is graphite;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 8 hours with ball mill, and wherein red mud, potassium felspar sand, albite and kaolin are crossed 250 orders, and pore former is crossed 180 orders, are then mixed to get blank in mixer, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water (being that blank and water are alternately put into), base ball is progressively grown up, and forms the base ball of diameter 3 ~ 6mm; The total amount that adds of water is 7% of blank total mass; The base ball of producing is put into dry 18 hours of the hot-air drier of 90 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1180 ℃, burn till (5 ℃/min of temperature rise rate, firing time 14h), obtain diameter 2.5 ~ 5.2mm light ceramics filtrate (red mud light filter material) (apparent porosity 60% ~ 70%, density 0.5 ~ 0.9 g/cm of wear-resisting not dry linting
3, crushing strength 5 ~ 13MPa);
2)
utilize andaluzite to prepare heavy ceramic filter material,
1. feed proportioning: raw material is weighed to proportioning by following weight percentage: andaluzite 54%, potassium felspar sand 8%, albite 20%, bauxitic clay 15%, borax 3%;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 18 hours with ball mill, cross 250 orders, then in mixer, be mixed to get blank, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray a small amount of water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 1.0 ~ 2.5mm; The total amount that adds of water is 7% of blank total mass; The base ball of producing is put into dry 18 hours of the hot-air drier of 90 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, in 1380 ℃, burn till (3 ℃/min of temperature rise rate, firing time 19h), obtain 0.8 ~ 2.0mm heavy ceramic filter material (or claim andaluzite heavy filtrate) (water-intake rate below 1%, the density 2.5 ~ 3.5g/cm of wear-resisting not dry linting
3, crushing strength 30 ~ 40MPa);
3)
utilize above-mentioned two kinds of ceramic filter materials to construct new ceramics filtering layer,
In granular-layer dust precipitator Zhong， lower floor, first lay the heavy ceramic filter material (lower floor) that utilizes andaluzite to prepare, laying depth is 1/4th of filtering layer total thickness; And then the light ceramics filtrate (upper strata) that utilizes red mud to prepare, laying depth is 3/4ths of filtering layer total thickness, with this, constructs new ceramics filtering layer.
This new ceramics filtering layer be used for filtering cement mill ash-laden gas (150 ~ 200 ℃, dust content 200 ~ 500mg/Nm
3) time, exhanst gas outlet dust content < 20 mg/Nm
3, lower than the emission standard of national regulation, and need not supplement in two years ceramic filter material (being difficult for dry linting).
Claims (4)
1. for a preparation method for the new ceramics filtering layer of high-temperature dust removal, it is characterized in that it comprises the following steps:
1) utilize red mud to prepare light ceramics filtrate for main raw material,
1.. feed proportioning: raw material is weighed to proportioning by following weight percentage: red mud 60-80%, potassium felspar sand 8-20%, albite 2-8%, kaolin 10-20%; Additional pore former, the add-on of pore former is the 15-30% of red mud, potassium felspar sand, albite and kaolin total mass;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 3 ~ 10 hours with ball mill, and wherein red mud, potassium felspar sand, albite and kaolin are crossed 250 orders, and pore former is crossed 180 orders, are then mixed to get blank in mixer, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 3 ~ 6mm; The total amount that adds of water is the 6-8% of blank total mass; The base ball of producing is put into dry 12 ~ 24 hours of the hot-air drier of 80 ~ 120 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, burn till in 1120 ~ 1200 ℃, obtain diameter 2.5 ~ 5.2mm light ceramics filtrate of wear-resisting not dry linting;
2)
utilize andaluzite to prepare heavy ceramic filter material,
1. feed proportioning: raw material is weighed to proportioning by following weight percentage: andaluzite 50 ~ 70%, potassium felspar sand 8 ~ 15%, albite 5 ~ 20%, bauxitic clay 15 ~ 30%, borax 2 ~ 10%;
2.. broken mixing: above-mentioned raw materials is dry grinded respectively 6 ~ 24 hours with ball mill, cross 250 orders, then in mixer, be mixed to get blank, standby;
3.. balling-up is dry: blank and water are progressively put into nodulizer balling-up: first spray water at the blank of nodulizer, form the ball of diameter 0.2 ~ 0.5mm, then alternately put into blank and water, base ball is progressively grown up, and forms the base ball of diameter 1.0 ~ 2.5mm; The total amount that adds of water is the 6-8% of blank total mass; The base ball of producing is put into dry 12 ~ 24 hours of the hot-air drier of 80 ~ 120 ℃;
4.. burn till filtrate: dried base ball is put into tunnel furnace or shuttle kiln, burn till in 1320 ~ 1400 ℃, obtain 0.8 ~ 2.0mm heavy ceramic filter material of wear-resisting not dry linting;
3)
utilize above-mentioned two kinds of ceramic filter materials to construct new ceramics filtering layer,
In granular-layer dust precipitator Zhong， lower floor, first lay the heavy ceramic filter material that utilizes andaluzite to prepare, laying depth is 1/4th to 1/3rd of filtering layer total thickness; And then the light ceramics filtrate that utilizes red mud to prepare, laying depth is 3/4ths to 2/3rds of filtering layer total thickness, obtains new ceramics filtering layer.
2. the preparation method of a kind of new ceramics filtering layer for high-temperature dust removal according to claim 1, is characterized in that: in step 1), described pore former is coal dust or graphite.
3. the preparation method of a kind of new ceramics filtering layer for high-temperature dust removal according to claim 1, is characterized in that: step 1) 4. in, 3 ~ 5 ℃/min of temperature rise rate, firing time 10 ~ 15h.
4. the preparation method of a kind of new ceramics filtering layer for high-temperature dust removal according to claim 1, is characterized in that: step 2) 4. in, 3 ~ 5 ℃/min of temperature rise rate, firing time 16 ~ 20h.
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| CN107140943A (en) * | 2017-04-27 | 2017-09-08 | 舒尔环保科技（合肥）有限公司 | A kind of preparation method of dedusting ceramic filter layer |
| CN108525644A (en) * | 2018-05-25 | 2018-09-14 | 新乡学院 | The preparation method of complex ore granule adsorbent |
| CN109869825A (en) * | 2017-12-05 | 2019-06-11 | 吉林大学 | A kind of heat-exchange system |
| CN111747774A (en) * | 2020-07-10 | 2020-10-09 | 武汉理工大学 | Red mud ceramic membrane support and preparation method and application thereof |
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| CN111747774A (en) * | 2020-07-10 | 2020-10-09 | 武汉理工大学 | Red mud ceramic membrane support and preparation method and application thereof |
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| CN103553703B (en) | 2014-12-03 |
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