CN101215107A - Method for preparing fire-resistant hydration-proof dolomite grog - Google Patents

Method for preparing fire-resistant hydration-proof dolomite grog Download PDF

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Publication number
CN101215107A
CN101215107A CNA2007103072158A CN200710307215A CN101215107A CN 101215107 A CN101215107 A CN 101215107A CN A2007103072158 A CNA2007103072158 A CN A2007103072158A CN 200710307215 A CN200710307215 A CN 200710307215A CN 101215107 A CN101215107 A CN 101215107A
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dolomite
dec
wedding agent
hour
takes
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CN100579930C (en
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张广发
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

Disclosed is a process for preparing a heat resisting and hydration resisting clinker dolomite, relating to a treatment method for clinker dolomite. Lightly burning the dolomite ores, then sample analysis after fully digesting with water, sifting out, drying and milling, adding the wedding agent of external components according to weight percentages: SiO2 takes 8-13%, P2O5 takes 1-2%, CaF2 takes 1-1.5%, CeO2 takes 0.25-0.5%, Fe2O3 takes 1-3%, TiO2 takes 2-4%, dry blending the wedding agent via a sand mixer, then evenly mixing the wedding agent in the sand mixer, adding water and fully stirring the wedding agent to obtain a calendaring and moistureless mass, producing billets according to density which is similar to or more than 2.2g/cm3, then drying the wedding agent, the sintering curve is that lighting a fire and evenly heating up to 300 DEC G for 6-8 hours, and evenly heating up from 300 DEC G to 800 DEC G for 9-11hours, evenly heating up from 800 DEC G to 1200 DEC G for 6-8 hours, evenly heating up from 1200 DEC G to 1600 DEC G for 12-14 hours, sintering the wedding agent at a constant temperature of more than 1600 DEC G for not less than 8 hours, thereby achieving the heat resisting and hydration resisting clinker dolomite.

Description

A kind of method for preparing the clinker dolomite of high temperature resistant, preventing hydration
Technical field
The present invention relates to the method for a kind of clinker dolomite and processing thereof, particularly relate to a kind of method for preparing the clinker dolomite of high temperature resistant, preventing hydration.
Background technology
Rhombspar is CaCO 3MgCO 3Or CaOMgO2 (CO 2) double salt, have high resistivity against fire and anti-slag aggressiveness, be the good raw material of producing magnesia-calcium brick, and reserves are abundant, cheap.But because it is after 1100 ℃ of calcinings, CO 2After all discharging, promptly form the mixture of MgO and CaO, this mixture proportion is very low, and physical strength is very little, and void content and chemically reactive are higher, and the deliquescence that very easily absorbs water generates Ca (OH) 2And Mg (OH) 2Produce self and expand, make the particle aquation and be broken into powder, can not be applied to produce as refractory materials, thereby lose use value.For a long time, people are seeking to solve clinker dolomite and goods thereof the not problem of aquation and unremitting effort always.The preventing hydration measure that clinker dolomite that sell current domestic and international market and goods thereof adopt is: (1) covers the grog particle with water tolerance material or oils, forms layer protecting film, or is called " dressing " method; (2) with the grog particle with the water tolerance material carry out oil immersion, wax soaks or vacuumize and pack, isolatedly contact with atmosphere.But aforesaid method keeps not broken relatively difficulty; in use very easily damage; if protective membrane, wax layer oil reservoir or packing are in case break, come off or open; CaO, MgO particle or goods are exposed in the atmosphere; still can the deliquescence aquation pulverize; thereby the use properties of losing causes heavy economic losses.
Summary of the invention
The purpose of this invention is to provide high resistivity against fire, slag resistance is good, cheap and a kind of method for preparing the clinker dolomite of high temperature resistant, preventing hydration that can the deliquescence aquation.
The objective of the invention is to realize by following mode:
1. method for preparing the clinker dolomite of high temperature resistant, preventing hydration is characterized in that:
(1) with the unprocessed dolomite ore 1050-1100 ℃ light-burned after, add water it fully digested, obtain containing the light dolomite powder of CaO, MgO, with this light dolomite powder drying of sieving, and sampling is chemically examined:
(2) the resulting rhombspar light burnt powder of step (1) is added wedding agent according to weight percent, the composition of wedding agent is: SiO 2, P 2O 5, CaF 2, CeO 2, Fe 2O 3And TiO 2, the weight percent that wedding agent accounts for light burnt powder is: the SiO of 8-13% 2, 1-2% P 2O 5, 1-1.5% CaF 2, 0.25-0.5% CeO 2, 1-3% Fe 2O 3TiO with 2-4% 2, do through sand mill earlier and mix, make its uniform mixing;
(3) resulting mixture in the step (2) is entered sand mill, added weight is than fully stirring for the water of 8-12%, and obtaining mixing does not have wet group, does not promptly have the even wet-milling of dry powder;
(4). with resulting wet mash weighing in the step (3), according to density 〉=2.2g/cm 3Striking adobe;
(5). with resulting wet base seasoning in the step (4) 20-24 hour, and then enter 35-75 ℃ of drying shed and be dried to the residuary water water content less than 1wt%;
(6). the flake of gained in the step (5) is put into kiln fire, build by laying bricks or stones with the magnesia brick material liner of sintering oven and bottom, sintering curre is: igniting evenly was warmed up to 300 ℃ with 6-8 hour, 300 ℃ evenly were warmed up to 800 ℃ with 9-11 hour, 800 ℃ evenly were warmed up to 1200 ℃ with 6-8 hour, 1200 ℃ evenly are warmed up to 1600 ℃ with 12-14 hour, are not less than 8 hours greater than 1600 ℃ of constant temperature;
(7). remove fiery mole and foreign material on the blank block that step (6) fires, promptly obtain high temperature resistant, the clinker dolomite of aquation not.
Advantage of the present invention is:
1. be the SiO of 8-13% owing in sintering procedure, adding weight ratio 2, its effect is in greater than 1600 ℃ of high-temperature calcinations, utilizes CaO and SiO 2Identical chemically reactive is carried out solid state reaction, makes it generate high-melting-point greater than 2100 ℃ 2CaOSiO 2(C 2S) and 3CaOSiO 3(C 3S), this dystectic novel cpd can thoroughly solve the easy aquation of CaO and the difficult problem pulverized;
2. adding weight percent is the P of 1-2% 2O 5, can prevent at low temperature both 900-1300 ℃ stage C 2Cause volume change during the crystal conversion of S, and form C in advance 3S also generates dystectic 3CaOP 2O 5(C 3P);
3. adding weight percent is the CaF of 1-1.5% 2, can promote the sintering of CaO, and quicken C 3S's is synthetic, reduces unsettled C as far as possible 2The content of S, thereby the stability of assurance clinker dolomite;
4. adding weight percent is the CeO of 0.25-0.5% 2But solid solution is in CaO, MgO intergranule or adhere to and grain surface, and CaO, MgO lattice are distorted, and promotes the normal development of CaO, MgO crystal grain to grow up, thereby improves the density and the waterproof voltinism of clinker dolomite;
5. adding weight percent is the Fe of 1-3% 2O 3, can form the liquid phase about 10%, along with the raising of calcining temperature, these liquid phases both can be distributed in the periclasite intergranule, and gathered the gap of calcium-magnesium clinker crystal grain angle gradually,, cause clinker dolomite to improve volume density, reduce void content;
6. adding weight percent is the TiO of 2-4% 2Can reduce calcining temperature, improve volume density, reduce void content, and water-repellancy that can clinker dolomite steady in a long-term.
The clinker dolomite of producing with method of the present invention or the mineralogical composition of appellation calcium-magnesium clinker are based on Fang Meishi, are CaO secondly, and C 2S, C 3S and a spot of C 4AF, C 2F.MgO, CaO, C 2S, C 3S is high fire-resistant crystalline phase, and increasing of these mineral facies helps the raising of dolomite refractory refractoriness and refractoriness under load, because C 2S, C 3S fusing point height, crystalline crystallization intensity is big, plastic deformation is little under the high temperature, with and cusped edge shape crystalline particle improved the resistivity of goods to shearing force, and the liquid phase viscosity that it at high temperature forms is quite big, so C 2S, C 3S for the outstanding advantage in conjunction with the goods of phase is:
1. hydration phenomena takes place to pulverize in the clinker dolomite and 2 hours the destructive inspection of goods process experiment pressure kettle boiling thereof made from the present invention.
2. the present invention can reduce the material that sintering temperature does not influence high-temperature behavior again owing to having added, so do not need higher sintering temperature, can make its volume density reach 3.0g/cm 3, intensity reaches more than the 40Mpa.
3. refractoriness under load is greater than 1700 ℃, and fire performance is good.
4. alkaline slag and irony slag there is higher chemical stability, so long service life.
5. because the clinker dolomite of producing with the present invention aquation not, for prolonged preservation provides convenience, and can use aqueous binders and directly produce, not needing oil immersion to handle can directly use, simplify production technique, solved the difficult problem of the easy aquation of clinker dolomite.
Embodiment
Embodiment 1:
(1). with weight percent is CaO＜30%, MgO＞20%, SiO 2＜2%, Al 2O 3＜0.2%Fe 2O 3＜0.5% unprocessed dolomite ore 1050-1100 ℃ light-burned, obtain the product that contains CaO, MgO, be that the water of 43-45% fully digested it 48-50 hour with weight percent, make its formation Powdered;
(2). after the screen cloth of resulting postdigestive ground dolomite in the step (1) by 0.5-1.0mm sieved, be dried to residuary water less than 1 Wt%, again through levigate be less than 0.074mm, promptly stand-by greater than 200 purpose rhombspar light burnt powders, sampling analysis, its chemical ingredients is by weight percentage: CaO＜50%, MgO＞35%, SiO 2＜3%, Al 2O 3＜0.2%, Fe 2O 3＜0.5%;
(3). get that resulting light dolomite powder 70Kg adds the 30Kg light-burning magnesium powder in the step (2), its chemical ingredients is by weight percentage: CaO:32.42%, MgO:48.69%, SiO 2: Fe 1.01%, 2O 3: Al 0.27%, 2O 3: 0.29%, add according to weight percent and contain SiO 2, Fe 2O 3, CaF 2, CeO 2, P 2O 5And TiO 2The wedding agent of composition, the weight of wedding agent is respectively: SiO 2: 9.50Kg, Fe 2O 3: 1.50Kg, CaF 2: 1.00Kg, CeO 2: 0.25Kg, P 2O 5: 1.50Kg and TiO 2: 2.00Kg, fully dried mixed through sand mill earlier, make its uniform mixing;
(4). resulting mixture in the step (3) is entered sand mill, and the water that adds 8-12% fully stirs, and obtaining mixing does not have wet group, does not promptly have the even wet-milling of dry powder;
(5). with resulting wet mash weighing in the step (4), according to density 〉=2.2g/cm 3Striking adobe;
(6). with resulting wet base seasoning in the step (5) 20-24 hour, and then enter 35-75 ℃ of drying shed and be dried to the residuary water water content less than 1%;
(7). the flake of gained in the step (6) is carried out loading of kiln fire, build by laying bricks or stones with magnesia brick material, magnesia chrome brick or homogeneous material the liner of sintering oven and bottom, during the base substrate loading of kiln, reserve levels, the fire-through passage between anyhow, sintering curre is: igniting evenly was warmed up to 300 ℃ with 6-8 hour, and 300 ℃ evenly heated up 800 ℃ with 9-11 hour, and 800 ℃ evenly heated up 1200 ℃ with 6-8 hour, 1200 ℃ evenly heat up 1600 ℃ with 12-14 hour, are not less than 8 hours greater than 1600 ℃;
(8). remove fiery mole and foreign material on the blank block that step (7) fires, promptly obtain volume density and reach and be not less than 3.0g/cm 3, intensity reaches 40Mpa above high temperature resistant, the clinker dolomite of aquation not.
Embodiment 2:
(1). with weight percent is CaO＜30%, MgO＞20%, SiO 2＜2%, Al 2O 3＜0.2%Fe 2O 3＜0.5% unprocessed dolomite ore 1100 ℃ light-burned, the CaO that obtains, MgO product weight percent are that 44% water fully digested it 48-50 hour, it is Powdered that it is all formed;
(2). after the screen cloth of resulting postdigestive ground dolomite in the step (1) by 0.5-1.0mm sieved, be dried to residuary water less than 1 Wt%, again through levigate be less than 0.074mm, promptly stand-by greater than 200 purpose rhombspar light burnt powders, sampling analysis, its chemical ingredients is by weight percentage: CaO＜50%, MgO＞35%, SiO 2＜3%, Al 2O 3＜0.02%, Fe 2O 3＜0.5%;
(3). get that resulting light dolomite powder 80Kg adds the 20Kg light-burning magnesium powder in the step (2), its chemical ingredients is by weight percentage: CaO:34.38%, MgO:42.78%, SiO 2: Fe 0.41%, 2O 3: Al 0.18%, 2O 3: 0.16%, add according to weight percent and contain SiO 2, Fe 2O 3, CaF 2, CeO 2, P 2O 5And TiO 2The wedding agent of composition, the weight of wedding agent is respectively: SiO 2: 10.83Kg, Fe 2O 3: 2.00Kg, CaF 2: 2.00Kg, CeO 2: 0.25Kg, P 2O 5: 1.50Kg and TiO 2: 2.00Kg, fully dried mixed through sand mill earlier, make its uniform mixing;
(4). resulting mixture in the step (3) is entered sand mill, and the water that adds 8-12% fully stirs, and obtaining mixing does not have wet group, does not promptly have the even wet-milling of dry powder;
(5). with resulting wet mash weighing in the step (4), according to density 〉=2.2g/cm 3Striking adobe;
(6). with resulting wet base seasoning in the step (5) 20-24 hour, and then enter 35-75 ℃ of drying shed and be dried to the residuary water water content less than 1%;
(7). the flake of gained in the step (6) is fired, and build by laying bricks or stones with magnesia brick material, magnesia chrome brick or homogeneous material the liner of sintering oven and bottom; During the base substrate loading of kiln, reserve levels, the fire-through passage between anyhow, sintering curre is: igniting evenly was warmed up to 300 ℃ with 6-8 hour, 300 ℃ evenly heated up 800 ℃ with 9-11 hour, 800 ℃ evenly heated up 1200 ℃ with 6-8 hour, 1200 ℃ evenly heated up 1600 ℃ with 12-14 hour, greater than 1600 ℃ of constant temperature 8 hours;
(8). fiery mole and foreign material on the blank block that removing step (7) is fired promptly obtain volume density and reach 3.0g/cm 3, intensity reaches above high temperature resistant, the clinker dolomite of aquation not of 40Mpa.
Embodiment 3:
(1). with weight percent is CaO＜30%, MgO＞20%, SiO 2＜2%, Al 2O 3＜0.2%Fe 2O 3＜0.5% unprocessed dolomite ore 1050-1100 ℃ light-burned, the CaO that obtains, MgO product weight percent are that the water of 43-45% fully digested it 48-50 hour, it is Powdered that it is all formed;
(2). after the screen cloth of resulting postdigestive ground dolomite in the step (1) by 0.5-1.0mm sieved, be dried to residuary water less than 1 Wt%, again through levigate be less than 0.074mm, promptly stand-by greater than 200 purpose rhombspar light burnt powders, sampling analysis, its chemical ingredients is by weight percentage: CaO＜50%, MgO＞35%, SiO 2＜3%, Al 2O 3＜0.02%, Fe 2O 3＜0.5%;
(3). get resulting light dolomite powder 100Kg in the step (2), its chemical ingredients is by weight percentage: CaO:43.72%, MgO:31.19%, SiO 2: Fe 0.10%, 2O 3: Al 0.10%, 2O 3: 0.07%, add according to weight percent and contain SiO 2, Fe 2O 3, CaF 2, CeO 2, P 2O 5And TiO 2The wedding agent of composition, the weight of wedding agent is respectively: SiO 2: 13.20Kg, Fe 2O 3: 2.0.Kg, CaF 2: 2.0Kg, CeO 2: 0.30Kg, P 2O 5: 1.50Kg and TiO 2: 2.50Kg, fully dried mixed through sand mill earlier, make its uniform mixing;
(4). resulting mixture in the step (3) is entered sand mill, and the water that adds 8-12% fully stirs, and obtaining mixing does not have wet group, does not promptly have the even wet-milling of dry powder;
(5). with resulting wet mash weighing in the step (4), according to density 〉=2.2g/cm 3Striking adobe;
(6). with resulting wet base seasoning in the step (5) 20-24 hour, and then enter 35-75 ℃ of drying shed and be dried to the residuary water water content less than 1%;
(7). the flake of gained in the step (6) is fired, and build by laying bricks or stones with magnesia brick material magnesia chrome brick or homogeneous material the liner of sintering oven and bottom; During the base substrate loading of kiln, reserve levels, the fire-through passage between anyhow, sintering curre is: igniting evenly was warmed up to 300 ℃ with 6-8 hour, 300 ℃ evenly heated up 800 ℃ with 9-11 hour, 800 ℃ evenly heated up 1200 ℃ with 6-8 hour, 1200 ℃ evenly heat up 1600 ℃ with 12-14 hour, are not less than 8 hours greater than 1600 ℃ of constant temperature;
(8). fiery mole and foreign material on the blank block that removing step (7) is fired promptly obtain volume density and are not less than 3.0g/cm 3, intensity reaches 40Mpa above high temperature resistant, the clinker dolomite of aquation not.
The present invention is a kind of to prepare the method for the clinker dolomite of high temperature resistant, preventing hydration, when firing, can carry out in shaft furnace, rotary kiln, tunnel furnace and garden kiln, adopts heavy oil, combustion gas or metallurgical coke to do fuel and can reduce environmental pollution.

Claims (1)

1. method for preparing the clinker dolomite of high temperature resistant, preventing hydration is characterized in that:
(1). with the unprocessed dolomite ore 1050-1100 ℃ light-burned after, add water it fully digested, obtain containing the light dolomite powder of CaO, MgO, with this light dolomite powder drying of sieving, and sampling is chemically examined;
(2). the resulting rhombspar light burnt powder of step (1) is added wedding agent according to weight percent, and the composition of wedding agent is: SiO 2, P 2O 5, CaF 2, CeO 2, Fe 2O 3And TiO 2, wedding agent accounts for the weight percent that contains the rhombspar light burnt powder and is: the SiO of 8-13%, the P of 1-2% 2O 5, 1-1.5% CaF 2, 0.25-0.5% CeO 2, 1-3% Fe 2O 3TiO with 2-4% 2, do through sand mill earlier and mix, make its uniform mixing;
(3). resulting mixture in the step (2) is entered sand mill, and added weight per-cent is that the water of 8-12% fully stirs, and obtaining mixing does not have wet group, does not promptly have the even wet-milling of dry powder;
(4). with resulting wet mash weighing in the step (3), according to density 〉=2.2g/cm 3Striking adobe;
(5). with resulting wet base seasoning in the step (4) 20-24 hour, and then enter 35-75 ℃ of drying shed and be dried to the residuary water water content less than 1wt%;
(6). the flake of gained in the step (5) is put into kiln fire, build by laying bricks or stones with the magnesia brick material liner of sintering oven and bottom, sintering curre is: igniting evenly was warmed up to 300 ℃ with 6-8 hour, 300 ℃ evenly heated up 800 ℃ with 9-11 hour, 800 ℃ evenly heated up 1200 ℃ with 6-8 hour, 1200 ℃ evenly heat up 1600 ℃ with 12-14 hour, are not less than 8 hours greater than 1600 ℃ of constant temperature;
(7). remove fiery mole and foreign material on the blank block that step (6) fires, promptly obtain high temperature resistant, the clinker dolomite of aquation not.
CN200710307215A 2007-12-30 2007-12-30 Method for preparing fire-resistant hydration-proof dolomite grog Expired - Fee Related CN100579930C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200502A (en) * 2010-03-25 2011-09-28 宝山钢铁股份有限公司 Method for authenticating dolomite for metallurgy in rotary kiln
CN102643098A (en) * 2012-05-11 2012-08-22 贵阳明通炉料有限公司 Dolomitic high-temperature ceramic matrix composite
CN114451252A (en) * 2022-02-11 2022-05-10 三峡大学 Method for soil formation of dewatered sludge by using crop straws and sandstone aggregate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200502A (en) * 2010-03-25 2011-09-28 宝山钢铁股份有限公司 Method for authenticating dolomite for metallurgy in rotary kiln
CN102200502B (en) * 2010-03-25 2013-01-02 宝山钢铁股份有限公司 Method for authenticating dolomite for metallurgy in rotary kiln
CN102643098A (en) * 2012-05-11 2012-08-22 贵阳明通炉料有限公司 Dolomitic high-temperature ceramic matrix composite
CN114451252A (en) * 2022-02-11 2022-05-10 三峡大学 Method for soil formation of dewatered sludge by using crop straws and sandstone aggregate

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