CN101830713B - Firm can plastic and preparation method thereof - Google Patents
Firm can plastic and preparation method thereof Download PDFInfo
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- CN101830713B CN101830713B CN2010101584308A CN201010158430A CN101830713B CN 101830713 B CN101830713 B CN 101830713B CN 2010101584308 A CN2010101584308 A CN 2010101584308A CN 201010158430 A CN201010158430 A CN 201010158430A CN 101830713 B CN101830713 B CN 101830713B
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Abstract
The invention discloses firm can plastic and a preparation method thereof. The firm can plastic comprises the following components in percentage by mass: 80 to 90 percent of a mixture of silicon carbide and mullite, 2 to 12 percent of silicon-containing micropowder of which the particle size is less than 2,200 meshes and 8 to 18 percent of low-temperature agglutinant, wherein the silicon carbide accounts for 5 to 15 percent of the mixture and the mullite accounts for 85 to 95 percent of the mixture. The preparation method comprises the following specific steps of: sequentially mixing for the first time, bundling, mixing for the second time, extruding, blanking and packing by taking the mullite and silicon carbide as a matrix material, and phosphoric acid and aluminium phosphate as a bonding agent. The firm can plastic has the advantages of effectively prolonging the service life of a refractory material, effectively improving the reliability of the refractory material, reducing the consumption and blowing out times of the refractory material, being used under the working condition of a dry coke quenching furnace, increasing the economic benefit and saving resources, along with high wear resistance and high compressive strength and compactness at normal temperature. The preparation method has the advantages of capability of improving the quality of the product, simple process and easy operation.
Description
Technical field
The present invention relates to a kind of refractory materials and preparation method thereof, is a kind of firm can plastic and preparation method thereof specifically.
Background technology
Coke dry quenching furnace in process of production, coke gravity from top to bottom contacts with the working face of anti-the material, produce friction, for working face, this friction is exactly long-standing mechanical wear, along with wearing and tearing day by day, working face starts to occur the particle of anti-material the coarse and that peel off gradually, surface tissue is loose, in addition, cold inertness gas nitrogen is being mingled with powdered carbon along with air-flow constantly clashes into and washes away loose already working face, under this working condition, the wear resistance of anti-material has been subject to unprecedented test, As time goes on, the liner working face is little by little degraded.
Mortar joint is built mud by laying bricks or stones owing to building by laying bricks or stones, as carbon, does not live through firing process brick, all poor with brick phase specific tenacity and compactness, moreover, dry after the mortar joint volumetric shrinkage, gap appears.All-pervasive air-flow is carried powdered carbon secretly and is inserted in gap, the rear expansion of being heated, gap is enlarged gradually, cause wall body structure to be damaged, siliceous mullite brick also splits because of the change of stressing conditions gradually gradually, and serious situation may be split into several by full brick, several times tribulation, the ability to bear of whole body of wall worse and worse, until afunction.If the employing measure is repaired not in time, the danger of collapsing is arranged.
Summary of the invention
Goal of the invention: the objective of the invention is that a kind of wear resistance is good in order to provide, cold crushing strength and compactness well and can effectively improve the work-ing life of anti-material and the firm can plastic of reliability.
Another object of the present invention is that a kind of technique is simple, the preparation method of the firm can plastic that can improve the quality of products in order to provide.
Technical scheme: in order to solve above-mentioned first purpose, the technical solution adopted in the present invention is: a kind of firm can plastic, comprise silicon carbide and mullite mixture 80～90%, be less than 2200 purposes containing siliceous micro mist 2～12%, low-temperature sintering agent 8～18%, in described mixture, silicon carbide is 5～15%, mullite is 85～95%; Above percentage ratio is mass percent.
The purpose that adds SiC in the present invention; owing to there being nitrogen atmosphere in stove; this cold inertness gas and SiC can directly react; generate silicon nitride; silicon nitride is a kind of material had than high-wear resistance; can play stronger provide protection to furnace lining itself, thereby strengthen the wear resistance of masonry.
Described low-temperature sintering agent comprises Yixing mud.
Described Yixing mud is the goods that obtain after 1100 ℃ of calcinings, and in the mud of Yixing, the mass percent of aluminium sesquioxide is 35～40%.
The critical particle diameter of described firm can plastic is 10～20mm.
The described purity containing siliceous micro mist is 99.99%.
In order to solve above-mentioned second purpose, the preparation method of described firm can plastic, the method comprises the steps:
1) batching: the mass percent according to above-mentioned each component is prepared burden: add in the mixture be comprised of mullite and silicon carbide and be less than 2200 purposes containing siliceous micro mist, use phosphoric acid and aluminum phosphate as wedding agent, use Yixing mud as the low-temperature sintering agent; Described mixture is made to aggregate and powder, and the mass content of aggregate is 60～70%, the mass content of powder is 30～40%;
2) once mixing: first use phosphoric acid and aggregate, powder, low-temperature sintering agent mixing, ageing mixture 1-3 days then, wherein the consumption of phosphoric acid is 5～10% of aggregate and powder gross weight;
3) secondary is mixing: Mixed With Admixture, aluminum phosphate, and mixing even, wherein the consumption of aluminum phosphate is 8～12% of aggregate and powder gross weight;
4) material extrusion;
5) cut base:
6) packing: by step 5) the gained blank obtains described firm can plastic with plastic paper sealing, woven bag outer packaging separately.
In order to make to mix, can improve the quality of products, order of addition(of ingredients) is for first adding aggregate, after add wedding agent, after particle is all moistening, then add powder, low-temperature sintering agent and admixture, and add aluminum phosphate, wet mixing 10-15min.
In step 3) in, described admixture is one or both in accelerating chemicals, water reducer; The execution conditions that add meteorological conditionss such as depending primarily on temperature, humidity, wind speed and scene of accelerating chemicals, water reducer.
The concentration of described phosphoric acid is more than 50%.
In the present invention owing in silicon carbide, mullite, containing iron, so once mixing operation in employing the method, purpose is in order to remove the irony in silicon carbide and mullite, principle is to have added phosphoric acid in substrate material, phosphoric acid can react and generate tertiary iron phosphate and hydrogen with iron, in this material, hydrogen must discharge (referred to as " aeration ") fully before forming materials, avoids masonry to produce pore and loose, thereby improves the performance of product.
Beneficial effect: compared with prior art, advantage of the present invention is: firm can plastic has good wear resistance, cold crushing strength and compactness well also can effectively improve work-ing life and the reliability of anti-material, thereby can reduce refractory consumption and blowing out number of times, be particularly useful for using under the coke dry quenching furnace working condition, can increase economic efficiency and economize on resources; The preparation method of firm can plastic of the present invention, not only technique is simple to operation, and can improve the quality of products.
Embodiment
Further set forth the present invention below by embodiment, should understand these embodiment and only for the present invention is described, is not used in and limits the scope of the invention.
Embodiment 1: a kind of firm can plastic of the present invention, the mixture that comprises 80% silicon carbide and mullite, the low-temperature sintering agent is 18%, in mixture, silicon carbide is 5%, mullite is 95%, being less than 2200 purposes is 2% containing siliceous micro mist, and above percentage ratio is mass percent.It is 35～40% that the low-temperature sintering agent adopts the mass percent of aluminium sesquioxide in Ni， Yixing, Yixing mud obtained after 1100 ℃ of calcinings; Purity containing siliceous micro mist is 99.99%.
The critical particle diameter of described firm can plastic is 10～20mm.The size of critical particle diameter is along with the firm can plastic masonry thickness that needs in construction process to build by laying bricks or stones is determined.
In the present invention, firm can plastic has following characteristic:
A, compressive strength:
Compressive strength is material sample in the effect of the load that is under pressure and the ultimate stress in destroying.The intensity size depends on kind and the consumption of wedding agent and admixture thereof, also is subject to material purity, proportioning, mixes and stirs the impact by factors such as amount of fluid, constructional method and conservation systems.Compressive strength when we have examined 850 ℃ * 3h in process of the test is 72Mpa, and this is the index after the material sintering.Because moldable intensity when the normal temperature is very little, we are wedding agent except adopting phosphoric acid when construction, the means (cold crushing strength) of intensity when the admixtures such as hardening accelerator, solidifying agent are another as the anti-material of raising have also been added, in order to can guarantee construction and duration continuously.But this intensity (similar sintering strength) is temporary transient, be to obtain by chemical process, play very important effect to front this intensity of material sintering.
B, heat-shock resistance
Heat-shock resistance claims again rapid heat cycle, thermal shocking resistivity and thermostability.In use, the ascending, descending of temperature is inevitable for material, makes it to produce expand and shrink.Produce thermal stresses.When thermal stresses surpasses self structure intensity, cracking has just occurred and peeled off, even make to serve as a contrast the body collapse.This use properties is the key index of measurement quality of materials, is also one of the selection of design and foundation of use operation.
The performance close relations such as minerals commonly used in chemical industry composition, microtexture, material particles and blending process, thermal expansion and the thermal conductivity of heat-shock resistance and material, also have substantial connection with the structural strength of material.In general, the coefficient of thermal expansion of material is large, and heat-shock resistance is poor, and thermal conductivity is higher, and heat-shock resistance is better.In the process of design and select material, admixture silicon carbide (SiC) is exactly that we make the reason of important consideration to this index.The thermal conductivity of SiC is relatively high, is the preferred material of highly heat-conductive material, and making wedding agent with phosphoric acid in addition is also for same consideration.Data and studies show that, the material thermal shock resistance of phosphoric acid combination can improve 3-5 doubly, and firm can plastic has taken into full account the importance of this use properties.
C, wear resistance
Wear resistance is the ability that the opposing friction is deteriorated, the suitability of measurable firm can plastic in wearing and tearing and washing away environment.We are in process of the test, and to many groups, test block is detected, and tested test block all reaches 6cc, this index reaction, and the wear resistance of firm can plastic has reached service requirements.
Embodiment 2: a kind of firm can plastic of the present invention, mixture, the low-temperature sintering agent that comprises 90% silicon carbide and mullite be 8%, be less than 2200 purposes is 12% containing siliceous micro mist, in mixture, silicon carbide is 15%, mullite is 85%, and above percentage ratio is mass percent.It is 35～40% that the low-temperature sintering agent adopts the mass percent of aluminium sesquioxide in Ni， Yixing, Yixing mud obtained after 1100 ℃ of calcinings; Purity containing siliceous micro mist is 99.99%.
The purpose that adds SiC in the present invention; owing to there being nitrogen atmosphere in stove; this cold inertness gas and SiC can directly react; generate silicon nitride; silicon nitride is a kind of material had than high-wear resistance; can play stronger provide protection to furnace lining itself, thereby strengthen the wear resistance of masonry.
Embodiment 3: a kind of firm can plastic of the present invention, mixture, the low-temperature sintering agent that comprises 85% silicon carbide and mullite be 13%, be less than 2200 purposes is 8% containing siliceous micro mist, in mixture, silicon carbide is 10%, mullite is 90%, and above percentage ratio is mass percent.It is 35～40% that the low-temperature sintering agent adopts the mass percent of aluminium sesquioxide in Ni， Yixing, Yixing mud obtained after 1100 ℃ of calcinings; Purity containing siliceous micro mist is 99.99%.
Embodiment 4: the preparation method of firm can plastic of the present invention, the method comprises the steps:
1) batching: adopting mullite, silicon carbide, being less than 2200 purpose purity is 99.99% containing siliceous micro mist as substrate material, add in the mixture formed by mullite and silicon carbide and be less than 2200 purposes containing siliceous micro mist, with phosphoric acid and aluminum phosphate as wedding agent, with Yixing mud as the low-temperature sintering agent; Described mixture is made to aggregate and powder, and the mass content of aggregate is 70%, the mass content of powder is 30%;
2) once mixing: the phosphoric acid that is first 50% by mass concentration and aggregate, powder, Yixing mud are mixing, bundle material 1-3 days then, and wherein the consumption of phosphoric acid is 8% of aggregate and powder gross weight; Owing to containing iron in mullite, so adopt this operation energy deironing;
3) secondary is mixing: Mixed With Admixture, aluminum phosphate, and mixing even, wherein the consumption of aluminum phosphate is 10% of aggregate and powder gross weight; Admixture is one or both in accelerating chemicals, water reducer; The execution conditions that add meteorological conditionss such as depending primarily on temperature, humidity, wind speed and scene of accelerating chemicals, water reducer.
4) material extrusion;
5) cut base:
6) packing: after cutting base, the gained blank obtains described firm can plastic with plastic paper sealing, woven bag outer packaging separately.
In the method, order of addition(of ingredients) is for first adding aggregate, after add wedding agent, after particle is all moistening, then add powder, low-temperature sintering agent and admixture, and add aluminum phosphate, wet mixing 10-15min.
Embodiment 5: substantially the same manner as Example 4, difference is that the mass content of aggregate is 60%, the mass content of powder is for being 40%; The consumption of phosphoric acid is 5% of aggregate and powder gross weight; The consumption of aluminum phosphate is 8% of aggregate and powder gross weight.
Embodiment 6: substantially the same manner as Example 4, difference is that the mass content of aggregate is 65%, the mass content of powder is 35%; The consumption of phosphoric acid is 10% of aggregate and powder gross weight, ageing mixture 2 days; The consumption of aluminum phosphate is 12% of aggregate and powder gross weight.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvement, and these improvement also should be considered as protection scope of the present invention.
Claims (1)
1. the preparation method of a firm can plastic, it is characterized in that, described firm can plastic comprise silicon carbide and mullite mixture 80～90%, be less than 2200 purposes containing siliceous micro mist 2～12%, low-temperature sintering agent 8～18%, in described mixture, silicon carbide is 5～15%, mullite is 85～95%; Above percentage ratio is mass percent; Described low-temperature sintering agent comprises Yixing mud, and described Yixing mud is the goods that obtain after 1100 ℃ of calcinings, and in the mud of Yixing, the mass percent of aluminium sesquioxide is 35～40%; The critical particle diameter of described firm can plastic is 10～20mm; The described purity containing siliceous micro mist is 99.99%;
The preparation method of above-mentioned firm can plastic comprises the steps:
1) according to the mass percent of above-mentioned each component, prepared burden: add in the mixture formed by mullite and silicon carbide and be less than 2200 purposes containing siliceous micro mist, use phosphoric acid and aluminum phosphate as wedding agent, use Yixing mud as the low-temperature sintering agent; The mixture that will be comprised of mullite and silicon carbide is made aggregate and powder, and the mass content of aggregate is 60～70%, the mass content of powder is 30～40%;
2) once mixing: first use phosphoric acid and aggregate, powder, low-temperature sintering agent mixing, ageing mixture 1-3 days then, wherein the consumption of phosphoric acid is 5～10% of aggregate and powder gross weight; The concentration of described phosphoric acid is more than 50%;
3) secondary is mixing: Mixed With Admixture, aluminum phosphate, and mixing even, wherein the consumption of aluminum phosphate is 8～12% of aggregate and powder gross weight; Described admixture is one or both in accelerating chemicals, water reducer;
4) material extrusion;
5) cut base:
6) packing: step 5) gained blank is obtained to described firm can plastic with plastic paper sealing, woven bag outer packaging separately;
In order to make to mix, can improve the quality of products, wherein order of addition(of ingredients) is for first adding aggregate, after add wedding agent, after particle is all moistening, then add powder, low-temperature sintering agent and admixture, and add aluminum phosphate, wet mixing 10-15min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101584308A CN101830713B (en) | 2010-04-27 | 2010-04-27 | Firm can plastic and preparation method thereof |
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| CN2010101584308A CN101830713B (en) | 2010-04-27 | 2010-04-27 | Firm can plastic and preparation method thereof |
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| CN101830713A CN101830713A (en) | 2010-09-15 |
| CN101830713B true CN101830713B (en) | 2013-12-11 |
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Families Citing this family (8)
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| CN103130516B (en) * | 2011-12-02 | 2014-12-03 | 河南省新密市青屏耐火材料有限责任公司 | Mullite carborundum brick used for dry quenching stove |
| CN102850069B (en) * | 2012-09-25 | 2014-09-03 | 南京联合荣大工程材料有限责任公司 | Kilneye plastic refractory |
| CN106278292A (en) * | 2015-06-03 | 2017-01-04 | 宜兴市国强炉业有限公司 | Recirculating fluidized bed high-temperature wearable is moldable and preparation method thereof |
| CN105218115A (en) * | 2015-10-12 | 2016-01-06 | 宜兴市炉顶密封工程有限公司 | The alkaline-resisting resistance to compression mould material of hard first |
| CN105565833A (en) * | 2015-12-18 | 2016-05-11 | 山东耀华特耐科技有限公司 | Efficient refractory castable for medical waste incinerator and preparation and construction technology thereof |
| CN105503210A (en) * | 2015-12-18 | 2016-04-20 | 山东耀华特耐科技有限公司 | Anti-corrosion plastic refractory for furnace top of medical garbage incinerator and manufacturing and construction process of anti-corrosion plastic refractory |
| CN105503142A (en) * | 2015-12-18 | 2016-04-20 | 山东耀华特耐科技有限公司 | Light moldable material used for waste heat boiler and constructed under severe-cold condition |
| CN106242599A (en) * | 2016-08-08 | 2016-12-21 | 武汉钢铁股份有限公司 | The fast repairing material at coke dry quenching furnace oblique flue bracket position and method for repairing and mending thereof |
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