CN107032810B - Gunning mix with excellent bonding performance for sintering large flue and preparation method - Google Patents
Gunning mix with excellent bonding performance for sintering large flue and preparation method Download PDFInfo
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- CN107032810B CN107032810B CN201710368276.9A CN201710368276A CN107032810B CN 107032810 B CN107032810 B CN 107032810B CN 201710368276 A CN201710368276 A CN 201710368276A CN 107032810 B CN107032810 B CN 107032810B
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Abstract
The gunning mix for the large sintering flue with excellent bonding performance comprises, by weight, 15-35% of coarse refractory aggregate with the particle size of 2-0.5mm, 5-15% of quartz stone with the particle size of less than or equal to 0.5mm, 15-25% of porous light aggregate with the particle size of 0.5 ~ 1.0.0 mm, 2-5% of silicon oxide micro powder, 20-35% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2-5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, no more than 3% of waste glass powder with the particle size of less than or equal to 0.088mm, 5-20% of silicate cement and 1-3% of calcium aluminate cement.
Description
Technical Field
The invention relates to a refractory gunning mix and a preparation method thereof, and particularly belongs to a gunning mix for a large sintering flue and a preparation method thereof.
Background
In the metallurgical industry, spray paint is generally used as a lining in a large flue of a sintering machine. The lining of the early flue uses a steel wire mesh as a reinforcing rib, and the light spray coating made of aluminum silicate combined by ordinary portland cement can meet part of use requirements of the pipe lining, but the steel wire mesh generates expansion and warping in the long-term use process, and the strength of the spray coating is low, so that the falling of the lining of the flue is caused. After retrieval:
chinese patent No. CN201610064402.7, which is a spray coating for making lining of iron-making blast furnace, the composition of the spray coating is as follows: 14 to 16 percent of bauxite with the granularity of 0 to 1mm, 18 to 22 percent of bauxite with the granularity of 1 to 3mm, 3 to 6 percent of bauxite with the granularity of 180 meshes, 18 to 20 percent of corundum powder with the granularity of 180 meshes, 18 to 22 percent of mullite powder, 3 to 5 percent of alumina powder, 3 to 5 percent of silicon micro powder, 17 to 19 percent of Secar 7117, 0.1 to 0.3 percent of explosion-proof fiber, 0.2 to 0.5 percent of metal aluminum powder, 0.1 to 0.3 percent of sodium tripolyphosphate and 0.2 to 0.5 percent of sodium hexametaphosphate. The spray coating for making the lining of the iron-making blast furnace has the advantages of excellent high-temperature resistance and corrosion resistance, higher compressive strength and rupture strength, small linear change rate and long service life, but the spray coating has high cost, low solidification speed and poor bonding capability, and cannot be used for sintering flues in acid environments.
A low-temperature solidifying spray paint of CN201510625375.1 is prepared from flint clay particles (20 ~ wt. portions) with granularity of 1 ~ mm, electroceramic particles (10 ~ wt. portions) with granularity of 0.1 ~ mm, mullite particles (10 ~ wt. portions) with granularity of 0.1 ~ mm, mullite powder (3 ~ wt. portions) with 200 meshes, 200 ~ 320 meshes, 5 ~ wt. portions of white corundum powder (5 ~ wt. portions), 800 meshes, activated alumina powder (3 ~ wt. portions), nano-silicon powder (2 ~ wt. portions), 200 ~ meshes, Guangxi white clay (5 ~ wt. portions) and PT organic binder (0.06 ~.15 wt. portions) through stirring and mixing, and the inorganic binder (10 ~ wt. portions) is liquid water glass.
The fireproof heat-insulating spray coating with the Chinese patent number of CN201210462062.5 comprises two parts of prefabricated slurry and a curing agent, wherein the prefabricated slurry is prepared from a fireproof aggregate and a binder, and the percentage of the components in the total weight of the fireproof heat-insulating spray coating is 60 ~ 63 percent of the fireproof aggregate, 34 ~ 37 percent of the binder and 3 ~ 6 percent of the curing agent, wherein the fireproof aggregate comprises 54 ~ 57 percent of alumina hollow spheres, 6 ~ 9 percent of kyanite, 20 ~ 23 percent of high-alumina clinker powder, 4 ~ 7 percent of silicon micropowder, 5 ~ 8 percent of alpha-Al in percentage by weight2O3Micropowder, 3 ~ 6% Cr2O3The process comprises the steps of weighing refractory aggregate, 5 ~ 8% polycrystalline alumina fiber, uniformly mixing the weighed refractory aggregate, a binder and a curing agent in sequence to obtain a refractory heat-insulation spray coating material, gripping and spraying the uniformly stirred slurry on the inner wall surface of a furnace lining by using a large-aperture spray gun for spraying coarse sand so as to prevent the slurry from being solidified after being placed for a long time, and directly putting into productionIs suitable for sintering flue in acid environment.
Chinese patent No. CN201410045728.6 entitled "Medium temperature pipeline spray coating", which comprises the following components in parts by weight: 38-58 parts of microporous light mullite, 3-9 parts of kyanite, 10-20 parts of cement, 20-30 parts of flint clay powder, 5-8 parts of Guangxi mud, and CeO21-3 parts of powder, 1-5 parts of zirconia powder, 0.4 part of additional paper fiber and 0.5-2 parts of silicon carbide whisker. The spray coating can be quickly constructed when in use, does not need special maintenance, and can obtain the gunning mix with smooth and flat surface, no crack, good air permeability, good thermal stability and good thermal insulation performance. However, the document contains Guangxi mud, zirconia and rare earth, so that the cost is high, and the document is used in a medium-low temperature environment and is not suitable for a sintering flue.
Chinese patent No. CN103553684A, which is a thermal insulation spray coating, comprises the following components in parts by weight: 38-58 parts of waste light clay brick, 3-9 parts of raw perlite, 10-20 parts of cement, 20-30 parts of flint clay powder, 5-8 parts of Guangxi mud, 1-3 parts of talcum powder and 0.5-2 parts of aluminum borate whisker. The spray coating can be quickly constructed during use, is practical, does not need special maintenance, has good acid resistance and reducibility resistance and good service performance, and is suitable for occasions needing heat preservation or occasions with strong reducibility. The raw perlite, the medium-sized foam and the Guangxi white mud are adopted, so that the drying is difficult, the bonding strength is reduced, and the sintering flue is easy to be washed and abraded by accumulated dust in the sintering flue to be damaged.
Chinese patent No. CN201310524416.9 spray coating with good wear resistance comprises the following components in percentage by weight: 60-70 parts of zircon powder, 8-13 parts of high-alumina bauxite, 5-10 parts of nano attapulgite, 5-10 parts of a bonding agent and 1-4 parts of a plasticizer are uniformly mixed to prepare the high-performance composite material; the binding agent comprises 14-18% of anatase titanium dioxide, 10-14% of phosphate and the balance of hydrated alumina, the raw materials are mixed, 10-14% of ethanol is added as a grinding medium, and 6-9% of surfactant. The document uses ethanol + phosphate as a bonding agent, so that the sintering flue is easy to catch fire and explode when being constructed in a sintering flue, and is difficult to spray and adhere to the wall surface of the flue.
Chinese patent No. CN201310315646.4 'A hot blast furnace pipeline spray coating and a use method thereof', which comprises the following components in parts by weight: 40-60 parts of light clay brick, 3-9 parts of perlite, 10-20 parts of high-alumina cement, 20-30 parts of mullite, 5-8 parts of bentonite, 1-3 parts of dextrin powder, 2-6 parts of hydrated alumina, 5-10 parts of organic fiber, 8-18 parts of water glass, 4-9 parts of aluminum dihydrogen phosphate and 10-15 parts of magnesia powder. The spray coating is quick and practical in use, does not need special maintenance and has good thermal shock resistance. The invention uses water glass and aluminum dihydrogen phosphate at the same time, is easy to be quickly solidified, and causes construction difficulty.
From the analysis of the prior art, if too many particles of heavy materials are used, the heat insulation effect is poor, and the spraying is not good; if the light porous material similar to perlite is used, the material is not wear-resistant, has low strength and is easy to wear. It is not suitable for sintering flue. Therefore, it is necessary to develop a spray coating which is suitable for the characteristics of the large sintering flue, has high temperature resistance, acid corrosion resistance, good bonding degree with the flue wall, no peeling and high strength, and aims at the characteristics of the large sintering flue.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the gunning material for the large sintering flue and the preparation method thereof, wherein the gunning material can meet the requirements of the characteristics of the large sintering flue, has high firmness of a spraying layer and remarkably reduces the stripping phenomenon, the service cycle of a gunning material layer can be prolonged by not less than 6 months, the strength of the gunning material layer is improved by at least 20%, waste materials are fully utilized, and the production cost is low.
The measures for realizing the aim are as follows:
the gunning mix for the sintering large flue with excellent bonding performance comprises, by weight, 15-35% of coarse refractory aggregate with the particle size of 2-0.5mm, 5-15% of quartz stone with the particle size of less than or equal to 0.5mm, 15-25% of porous light aggregate with the particle size of 0.5 ~ 1.0.0 mm, 2-5% of silica micropowder, 20-35% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2-5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, less than or equal to 3% of waste glass powder with the particle size of less than or equal to 0.088mm, 5-20% of silicate cement and 1-3% of calcium aluminate cement, wherein water is added according to 1 ~ 3% of the total weight of the raw materials in use, and is stirred and wetted, and when spraying is carried out, a gun head is filled with a coagulant solution according to 15% of 8 ~ 15% of the total weight.
It is characterized in that: the coarse refractory aggregate is one or a mixture of more of alumina clinker, flint clay clinker, waste high-alumina brick particles, waste clay brick particles and mullite particles in any proportion.
It is characterized in that: the porous light aggregate is one or a mixture of more of porous alumina clinker, porous flint clay clinker and porous mullite clinker in any proportion; and the porosity of the porous lightweight aggregate is not less than 20 percent of the volume percentage.
It is characterized in that: the compressive strength of the Portland cement is not lower than 30MPa in 7 days under the state of a pure slurry sample.
It is characterized in that: the calcium oxide content in the calcium aluminate cement is not less than 30 percent by weight.
It is characterized in that the particle size of the porous lightweight aggregate is 0.5 ~ 1.0.0 mm.
It is characterized in that: the aqueous coagulant solution consists of: no more than 0.03 wt% of aluminum sulfate, no more than 0.02 wt% of ferrous sulfate, no more than 0.02 wt% of sodium silicate, and the balance of water.
The method for preparing the gunning mix with excellent bonding property for sintering the large flue comprises the following steps:
1) firstly, 15-35% of coarse refractory aggregate with the particle size of 2-0.5mm, 5-15% of quartz stone with the particle size of less than or equal to 0.5mm, 15-25% of porous light aggregate with the particle size of 0.5 ~ 1.0.0 mm, 2-5% of silicon oxide micro powder, 20-35% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2-5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, less than or equal to 3% of waste glass powder with the particle size of less than or equal to 0.088mm, 5-20% of silicate cement and 1-3% of calcium aluminate cement are mixed to be fully and uniformly mixed;
2) adding water according to 1-3% of the total weight of the raw materials in the step 1), and stirring and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, adding 8 ~ 15% of coagulant aqueous solution into the gun head of the spraying machine, and spraying the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
The mechanism and the action of the raw materials in the invention are as follows:
coarse refractory aggregate with the particle size of 2-0.5 mm: in the invention, the material mainly plays a role in a framework and a supporting role in gunning material, and has a wear-resistant effect; if the content is less than 15%, the abrasion resistance is too poor, and if it is more than 35%, the heat insulating effect is poor.
Quartz stone with granularity less than or equal to 0.5 mm: 5-15%: in the invention, the material mainly plays the roles of acid-resistant aggregate and support in the gunning material, and has the effect of abrasion resistance; if the content is less than 5%, the abrasion resistance is too poor, and if it is more than 15%, the crystal form is changed greatly to cause cracking.
Porous lightweight aggregate with the particle size less than or equal to 1.0 mm: 15-25 wt%, which mainly plays a role in heat insulation porous framework and support; if the content is less than 15%, the heat retaining property is too poor, and if it is more than 25%, the strength is too low due to too light weight, and the composition is not wear-resistant.
Silicon oxide micro powder: 2-5%, in the invention, it mainly plays a role in promoting dispersion and sintering; if the content is less than 2%, the sintering effect is deteriorated, and if it is more than 5%, the gunning material is too light and foams.
High-aluminum clinker powder with the particle size less than or equal to 0.088 mm: 20-35%; in the invention, the adhesive mainly plays a role in bonding and sintering fine powder; if the content is less than 20%, the abrasion resistance is poor, and if it is more than 35%, the heat insulating effect is poor.
Sodium bentonite powder with the granularity less than or equal to 0.088 mm: 2-5%, in the invention, the main adhesive functions; if the content is less than 2%, the viscosity immediately after ejection is poor, and if it is more than 5%, the gunning layer is foamed.
Waste glass powder with the granularity less than or equal to 0.088 mm: not more than 3%, which in the present invention mainly plays a role in reflow bonding at medium and low temperatures; if the content is less than 20%, the abrasion resistance is poor, and if it is more than 3%, the melting point is lowered and the high-temperature performance is not good.
Portland cement: 5-20%: in the present invention, it mainly functions as the adhesive curing strength; if the content is less than 5%, the strength is too low, and if it is more than 20%, the spray coating tends to crack, resulting in poor high-temperature properties.
Calcium aluminate cement: 1-3%: in the present invention, it mainly plays a role in curing and bonding; if the content is less than 1%, the strength is low, and if it is more than 3%, the cost increases.
The invention adopts the Portland cement and the calcium aluminate cement to compound at the same time, the Portland cement is slowly solidified, and the temperature resistance is not high; the aluminate cement is fast in solidification and high-temperature resistant, and the solidification time of the aluminate cement can be adjusted and the high-temperature resistance of the gunning mix is improved through compounding.
The invention adopts an external coagulant aqueous solution which mainly plays a role in promoting coagulation; the added aluminum sulfate is not more than 0.03 percent, the added ferrous sulfate and the added sodium silicate are respectively limited to be not more than 0.02 percent, and if the added amount is too much, the spray paint is solidified too fast and cannot be discarded in time for construction.
Compared with the prior art, the invention can meet the requirement of the characteristics of a large sintering flue, can ensure that the firmness of a spray coating is high, can obviously reduce the peeling phenomenon, can increase the service life of a gunning material layer from the current 12 months to be not less than 6 months, can ensure that the service life is at least 18 months, improves the strength of the gunning material layer from the current not more than 10MPa to be at least 20 percent, namely achieves at least 12MPa, fully utilizes waste materials, and has low production cost.
Detailed Description
The present invention is described in detail below:
example 1:
a gunning mix for a sintering flue with excellent bonding performance comprises, by weight, 18% of waste high-alumina bricks with the particle size of 2-0.5mm, 12% of quartz stones with the particle size of less than or equal to 0.5mm, 20% of porous flint clay clinkers with the particle size of 0.5 ~ 1.0.0 mm and the porosity of 23%, 5% of silicon oxide micro powder, 25% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 3% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, 2% of waste glass powder with the particle size of less than or equal to 0.088mm, 12% of Portland cement with the compressive strength of 35MPa in a state of a neat paste sample, 3% of calcium aluminate cement with the calcium oxide content of 32wt%, 3% of calcium aluminate cement with the total weight of the raw materials when the gunning mix is used, and the gunning mix is filled into an aqueous solution of a coagulant with the gun.
The coagulant aqueous solution comprises the following components in percentage by weight: 0.03 percent of aluminum sulfate, 0.01 percent of ferrous sulfate, 0.012 percent of sodium silicate and the balance of water.
The preparation method comprises the following steps:
1) firstly, bauxite clinker with the granularity of 2-0.5 mm: 17.5 percent of quartz stone with the granularity less than or equal to 0.5 mm: 12 percent, porous flint clay clinker with the granularity less than or equal to 1.0mm and the porosity of 23 percent: 20%, silicon oxide micropowder: 5 percent of high-aluminum clinker powder with the granularity less than or equal to 0.088 mm: 25 percent; sodium bentonite powder with the granularity less than or equal to 0.088 mm: 3 percent of waste glass powder with the granularity less than or equal to 0.088mm, and Portland cement with the compressive strength of 35MPa in 7 days under the state of a neat paste sample: 12 percent of calcium aluminate cement with the calcium oxide content of 32 weight percent and 3 percent of calcium aluminate cement are mixed to be fully and uniformly mixed;
2) adding additional water accounting for 3 percent of the total weight of the raw materials in the step 1) for wetting and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, filling a coagulant aqueous solution into the gun head of the spraying machine according to 8% of the total weight percentage of the raw materials in the step 1), and spraying the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
Through detection, the compressive strength of the spray coating layer at 110 ℃ for 24h is 19.2MPa, the compressive strength at 1000 ℃ for 3h is 25.7MPa, and the spray coating layer is tried for 18 months, has no peeling phenomenon and is still tried.
Example 2:
a gunning mix with excellent bonding performance for a sintering flue comprises, by weight, 35% of waste clay brick and mullite with the particle size of 2-0.5mm, 7% of quartz stone with the particle size of less than or equal to 0.5mm, 15% of porous alumina clinker with the particle size of 0.55 ~ 1.0.0 mm and the porosity of 22%, 4% of silicon oxide micropowder, 23% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2.5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, 2.5% of waste glass powder with the particle size of less than or equal to 0.088mm, 10% of Portland cement with the compressive strength of 33.2MPa in a state of a neat paste sample, 1% of calcium aluminate cement with the calcium oxide content of 33wt%, 1.5% of the total weight of the raw materials when the gunning mix is used, and 9% of a coagulant aqueous solution is filled into a wetting gun head;
the coagulant aqueous solution comprises the following components in percentage by weight: 0.022% of aluminum sulfate, 0.015% of ferrous sulfate, 0.013% of sodium silicate and the balance of water.
The preparation method comprises the following steps:
1) firstly, waste clay brick material with the granularity of 2-0.5mm and mullite 35 percent, quartz stone with the granularity of less than or equal to 0.5mm 7 percent, porous alumina clinker with the granularity of 0.55 ~ 1.0.0 mm and porosity of 22 percent 15 percent, silicon oxide micro powder 4 percent, high alumina clinker powder with the granularity of less than or equal to 0.088mm 22.5 percent, sodium bentonite powder with the granularity of less than or equal to 0.088mm 2.5 percent, waste glass powder with the granularity of less than or equal to 0.088mm 2.5 percent, Portland cement with the strength of 33.2MPa 10 percent and calcium aluminate cement with the calcium oxide content of 33 weight percent are fully and uniformly mixed in a neat slurry sample state for 7 days;
2) adding additional water accounting for 1.5 percent of the total weight of the raw materials in the step 1) for wetting and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, filling a coagulant aqueous solution into the gun head of the spraying machine according to 9% of the total weight percentage of the raw materials in the step 1), and spraying the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
The detection shows that the compressive strength of the spray coating layer at 110 ℃ for 24h is 12.9MPa, the compressive strength at 1000 ℃ for 3h is 21.5MPa, and the spray coating layer is still used after trial for 20 months without peeling.
Example 3
The gunning mix with excellent bonding performance for the large sintering flue comprises the following raw materials in percentage by weight: waste high-alumina brick particles with the particle size of 2-0.5 mm: 18.5 percent of quartz stone with the granularity less than or equal to 0.5 mm: 15 percent, porous alumina clinker with the granularity less than or equal to 1.0mm and the porosity of 23.5 percent, and porous mullite clinker with the porosity of 23 percent: 17%, silicon oxide fine powder: 2 percent of high-aluminum clinker powder with the granularity less than or equal to 0.088 mm: 21 percent; sodium bentonite powder with the granularity less than or equal to 0.088 mm: 3 percent of waste glass powder with the granularity less than or equal to 0.088 mm: 2.0%, Portland cement with compressive strength of 34.1MPa in the state of neat paste sample for 7 days: 19%, calcium oxide content 33.5wt% calcium aluminate cement: 2.5 percent; when in use, the raw materials are added with water, the weight percentage of which is 2.5 percent of the total weight percentage of the raw materials, and the mixture is stirred and moistened. The gun head of the spray gun is filled with coagulant aqueous solution according to 12 percent of the total weight percentage of the raw materials;
the coagulant aqueous solution comprises the following components in percentage by weight: 0.01 percent of aluminum sulfate, 0.02 percent of ferrous sulfate, 0.02 percent of sodium silicate and the balance of water.
The preparation method comprises the following steps:
1) firstly, waste high-alumina brick particles with the particle size of 2-0.5mm are prepared: 18.5 percent of quartz stone with the granularity less than or equal to 0.5 mm: 15 percent, porous alumina clinker with the granularity less than or equal to 1.0mm and the porosity of 23.5 percent, and porous mullite clinker with the porosity of 23 percent: 17%, silicon oxide fine powder: 2 percent of high-aluminum clinker powder with the granularity less than or equal to 0.088 mm: 21 percent; sodium bentonite powder with the granularity less than or equal to 0.088 mm: 3 percent of waste glass powder with the granularity less than or equal to 0.088 mm: 2.0%, Portland cement with compressive strength of 34.1MPa in the state of neat paste sample for 7 days: 19%, calcium oxide content 33.5wt% calcium aluminate cement: 2.5 percent of the mixture is mixed to be fully and uniformly;
2) adding additional water accounting for 2.5 percent of the total weight of the raw materials in the step 1) for wetting and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, filling a coagulant aqueous solution into the gun head of the spraying machine according to 9.5 percent of the total weight percentage of the raw materials in the step 1), and spraying and repairing the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
Through detection, the compressive strength of the spray coating layer at 110 ℃ for 24h is 23.8MPa, the compressive strength at 1000 ℃ for 3h is 29.1MPa, and the spray coating layer is still used after 18 months of trial, and no peeling phenomenon occurs.
Example 4:
a gunning mix with excellent bonding performance for sintering a large flue comprises, by weight, 26% of a mixture of alumina clinker and waste high-alumina brick particles with the particle size of 2-0.5mm, 8% of quartz stone with the particle size of less than or equal to 0.5mm, 16% of porous mullite clinker with the particle size of 0.7 ~ 1.0.0 mm and the porosity of 21%, 2.5% of silica micropowder, 31% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2.5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, 1.0% of waste glass powder with the particle size of less than or equal to 0.088mm, 10.5% of Portland cement with the compressive strength of 34.1MPa in a neat slurry sample state, 2% of calcium aluminate cement with the calcium oxide content of 33.0wt%, 3% of the total weight of the raw materials in use, and an external water stirring and wetting spray gun head, wherein 9.8% of the total weight of the raw materials is filled into a coagulant aqueous solution;
the coagulant aqueous solution comprises the following components in percentage by weight: 0.015% of aluminum sulfate, 0.015% of ferrous sulfate, 0.02% of sodium silicate and the balance of water.
The preparation method comprises the following steps:
1) firstly, 26 percent of alumina clinker with the granularity of 2-0.5mm and waste high-alumina brick particle mixture, 8 percent of quartz stone with the granularity of less than or equal to 0.5mm, 16 percent of porous mullite clinker with the granularity of 0.7 ~ 1.0.0 mm and the porosity of 21 percent, 2.5 percent of silicon oxide micropowder, 31 percent of high-alumina clinker powder with the granularity of less than or equal to 0.088mm, 2.5 percent of sodium bentonite powder with the granularity of less than or equal to 0.088mm, 1.0 percent of waste glass powder with the granularity of less than or equal to 0.088mm, 10.5 percent of Portland cement with the compressive strength of 34.1MPa after 7 days under the state of a neat paste sample, and 2 percent of calcium aluminate cement with the calcium oxide content of 33.0 weight percent are mixed to be fully and uniformly mixed;
2) adding additional water accounting for 3 percent of the total weight of the raw materials in the step 1) for wetting and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, filling a coagulant aqueous solution into the gun head of the spraying machine according to 9.8 percent of the total weight percentage of the raw materials in the step 1), and spraying and repairing the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
The detection shows that the compressive strength of the spray coating layer at 110 ℃ for 24h is 22.8MPa, the compressive strength at 1000 ℃ for 3h is 28.3MPa, and the test result shows that the spray coating layer has only a very small area of peeling phenomenon after 19 months of trial use, but can still be used.
Example 5:
a gunning mix with excellent bonding performance for a sintering large flue comprises the following raw materials, by weight, 29% of mullite particles with the particle size of 2-0.5mm, 6.5% of quartz stones with the particle size of less than or equal to 0.5mm, 16.5% of porous mullite clinker with the particle size of 0.8 ~ 1.0.0 mm and the porosity of 23.6% and 16.5% of porous alumina clinker mixture with the porosity of 22.8%, 4.5% of silica micropowder, 24% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 4.5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, 1.5% of waste glass powder with the particle size of less than or equal to 0.088mm, 12% of Portland cement with the compressive strength of 7 days under the state of a neat paste sample, 1.5% of calcium aluminate cement with the calcium oxide content of 33.0wt%, 2.6% of the total weight of the raw materials are added with stirring when the gunning mix is used, and 15% of a water solution is filled into a spray gun head according;
the coagulant aqueous solution comprises the following components in percentage by weight: 0.013% of aluminum sulfate, 0.02% of ferrous sulfate, 0.012% of sodium silicate and the balance of water.
The preparation method comprises the following steps:
1) firstly, 29 percent of mullite particles with the granularity of 2-0.5mm, 6.5 percent of quartz stone with the granularity of less than or equal to 0.5mm, 16.5 percent of porous mullite clinker with the granularity of 0.8 ~ 1.0.0 mm and the porosity of 23.6 percent and porous alumina clinker mixture with the porosity of 22.8 percent, 4.5 percent of silicon oxide micro powder, 24 percent of high alumina clinker powder with the granularity of less than or equal to 0.088mm, 4.5 percent of sodium bentonite powder with the granularity of less than or equal to 0.088mm, 1.5 percent of waste glass powder with the granularity of less than or equal to 0.088mm are mixed to be fully and uniformly mixed, 12 percent of Portland cement with the compressive strength of 34.0MPa and 1.5 percent of calcium aluminate cement with the calcium oxide content of 33.0 weight percent are mixed in a neat paste sample state for 7 days;
2) adding additional water accounting for 2.6 percent of the total weight of the raw materials in the step 1) for wetting and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, filling 15 percent of the total weight of the raw materials into a coagulant aqueous solution at the gun head of the spraying machine according to the step 1), and spraying the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
The detection shows that the compressive strength of the spray coating layer at 110 ℃ for 24h is 27.6MPa, the compressive strength at 1000 ℃ for 3h is 32.6MPa, and the spray coating layer only has 0.5 percent of stripping phenomenon occupying the spray repair area after trial for 23 months, but can still be used.
Example 6:
the gunning mix with excellent bonding performance for the large sintering flue comprises the following raw materials in percentage by weight: waste high-alumina brick particles with the particle size of 2-0.5 mm: 27 percent of quartz stone with the granularity less than or equal to 0.5 mm: 8.5 percent, the granularity is less than or equal to 1.0mm, and the granularity is not less than 0.5mm, and the porosity is 40 percent: 18%, silica micropowder: 3 percent of high-aluminum clinker powder with the granularity less than or equal to 0.088 mm: 25 percent; sodium bentonite powder with the granularity less than or equal to 0.088 mm: 3.5 percent of waste glass powder with the granularity less than or equal to 0.088mm, Portland cement with the compressive strength of 34.0MPa in 7 days under the state of a neat paste sample: 11.5%, calcium oxide content 33.0wt% calcium aluminate cement: 1.5 percent; when in use, water is added according to 3 percent of the total weight percentage of the raw materials, and the raw materials are stirred and wetted; the gun head of the spray gun is filled with coagulant aqueous solution according to 13.5 percent of the total weight percentage of the raw materials;
the coagulant aqueous solution comprises the following components in percentage by weight: 0.02 percent of aluminum sulfate, 0.01 percent of ferrous sulfate, 0.015 percent of sodium silicate and the balance of water.
The preparation method comprises the following steps:
1) firstly, waste high-alumina brick particles with the particle size of 2-0.5mm are prepared: 27 percent of quartz stone with the granularity less than or equal to 0.5 mm: 8.5 percent, the granularity is less than or equal to 1.0mm, and the granularity is not less than 0.5mm, and the porosity is 40 percent: 18%, silica micropowder: 3 percent of high-aluminum clinker powder with the granularity less than or equal to 0.088 mm: 25 percent; sodium bentonite powder with the granularity less than or equal to 0.088 mm: 3.5 percent of waste glass powder with the granularity less than or equal to 0.088mm, Portland cement with the compressive strength of 34.0MPa in 7 days under the state of a neat paste sample: 11.5%, calcium oxide content 33.0wt% calcium aluminate cement: 1.5 percent until the mixture is fully and uniformly mixed;
2) adding additional water accounting for 3 percent of the total weight of the raw materials in the step 1) for wetting and mixing to prepare a spraying wet material;
3) and (3) spraying, namely, adopting a spraying machine, filling 13.5 percent of the total weight of the raw materials into a coagulant aqueous solution at the gun head of the spraying machine according to the step 1), and spraying and repairing the wet material on the inner surface of the steel shell of the flue to form a uniform spraying layer.
The detection shows that the compressive strength of the spray coating layer at 110 ℃ for 24h is 27.7MPa, the compressive strength at 1000 ℃ for 3h is 32.9MPa, and the spray coating layer only has 0.2 percent of stripping phenomenon occupying the spray repair area after trial use for 24 months, but can still be used.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention.
Claims (6)
1. The gunning mix for the sintering large flue with excellent bonding performance comprises the following raw materials, by weight, 15-35% of coarse refractory aggregate with the particle size of 2-0.5mm, 5-15% of quartz stone with the particle size of less than or equal to 0.5mm, 15-25% of porous light aggregate with the particle size of 0.5 ~.0 mm, 4-5% of silica micropowder, 20-35% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2-5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, less than or equal to 3% of waste glass powder with the particle size of less than or equal to 0.088mm, 5-20% of silicate cement and 1-3% of calcium aluminate cement, wherein when the gunning mix is used, the gunning mix is wetted by adding water accounting for 1 ~% of the total weight of the raw materials, and when the gunning mix is used, a coagulant aqueous solution is added into a gun head;
the aqueous coagulant solution consists of: no more than 0.03 wt% of aluminum sulfate, no more than 0.02 wt% of ferrous sulfate, no more than 0.02 wt% of sodium silicate, and the balance of water.
2. The gunning mix for a large sintering flue, which has excellent adhesion properties, according to claim 1, wherein: the coarse refractory aggregate is one or a mixture of more of alumina clinker, flint clay clinker, waste high-alumina brick particles, waste clay brick particles and mullite particles in any proportion.
3. The gunning mix for a large sintering flue, which has excellent adhesion properties, according to claim 1, wherein: the porous light aggregate is one or a mixture of more of porous alumina clinker, porous flint clay clinker and porous mullite clinker in any proportion; and the porosity of the porous lightweight aggregate is not less than 20 percent of the volume percentage.
4. The gunning mix for a large sintering flue, which has excellent adhesion properties, according to claim 1, wherein: the compressive strength of the Portland cement is not lower than 30MPa in 7 days under the state of a pure slurry sample.
5. The gunning mix for a large sintering flue, which has excellent adhesion properties, according to claim 1, wherein: the calcium oxide content in the calcium aluminate cement is not less than 30 percent by weight.
6. The method for preparing the gunning material for the large sintering flue, which has excellent bonding property, according to claim 1, comprises the steps of:
1) firstly, 15-35% of coarse refractory aggregate with the particle size of 2-0.5mm, 5-15% of quartz stone with the particle size of less than or equal to 0.5mm, 15-25% of porous light aggregate with the particle size of 0.5 ~ 1.0.0 mm, 4-5% of silicon oxide micro powder, 20-35% of high-alumina clinker powder with the particle size of less than or equal to 0.088mm, 2-5% of sodium bentonite powder with the particle size of less than or equal to 0.088mm, less than or equal to 3% of waste glass powder with the particle size of less than or equal to 0.088mm, 5-20% of silicate cement and 1-3% of calcium aluminate cement are mixed to be fully and uniformly mixed;
2) adding water in an amount which is 1-3% of the total weight of the raw materials in the step 1), and stirring and mixing to prepare a spraying wet material;
3) spraying, namely adopting a spraying machine, adding 8 ~ 15% of coagulant aqueous solution outside a gun head of the spraying machine, and spraying the wet material on the inner surface of a steel shell of the flue to form a uniform spraying layer;
the aqueous coagulant solution consists of: no more than 0.03 wt% of aluminum sulfate, no more than 0.02 wt% of ferrous sulfate, no more than 0.02 wt% of sodium silicate, and the balance of water.
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| US10450230B2 (en) * | 2017-09-26 | 2019-10-22 | Nano And Advanced Materials Institute Limited | Fire resistant eco concrete blocks containing waste glass |
| CN111499400B (en) * | 2020-04-27 | 2022-04-19 | 河南省宏达炉业有限公司 | High-strength low-rebound fireproof spray coating and preparation method thereof |
| CN111574233B (en) * | 2020-05-26 | 2022-04-12 | 中钢洛耐科技股份有限公司 | Ceramic wear-resistant hot gunning mix and preparation method thereof |
| CN111848192A (en) * | 2020-07-31 | 2020-10-30 | 北京金隅通达耐火技术有限公司 | Refractory material prepared from waste high-alumina ceramic balls and waste shed plate |
| CN111960831B (en) * | 2020-08-21 | 2022-05-27 | 浙江锦诚新材料股份有限公司 | Spray coating for cement kiln preheater |
| CN112279659B (en) * | 2020-10-28 | 2022-12-09 | 长兴兴鹰新型耐火建材有限公司 | Multi-groove-position stirrer for preparing refractory spray paint |
| CN112521782A (en) * | 2021-01-06 | 2021-03-19 | 成都容浓伊涂料科技有限公司 | Preparation method of high-toughness water-based wear-resistant ceramic coating |
| CN113072385A (en) * | 2021-03-09 | 2021-07-06 | 山东九龙新材料有限公司 | Ladle opening castable added with waste daily glass powder |
| CN113845786A (en) * | 2021-10-22 | 2021-12-28 | 河南安培新材料科技有限公司 | Anticorrosive heat-preservation spray coating with desulfurization effect and preparation method and application thereof |
| CN114409418B (en) * | 2022-01-19 | 2023-02-07 | 宜兴市锅炉密封工程有限公司 | High-strength wear-resistant castable and preparation method and application thereof |
| CN116217221B (en) * | 2023-01-09 | 2024-04-09 | 中冶武汉冶金建筑研究院有限公司 | Preparation method of high-strength heat-insulating refractory mortar |
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