CN107188581A - A kind of calcium magnesite and preparation method thereof - Google Patents
A kind of calcium magnesite and preparation method thereof Download PDFInfo
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- CN107188581A CN107188581A CN201710510635.XA CN201710510635A CN107188581A CN 107188581 A CN107188581 A CN 107188581A CN 201710510635 A CN201710510635 A CN 201710510635A CN 107188581 A CN107188581 A CN 107188581A
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
- C04B2235/321—Dolomites, i.e. mixed calcium magnesium carbonates
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The present invention relates to a kind of calcium magnesite and preparation method thereof, belong to technical field of refractory materials.The present invention is first by lithia, after sodium metasilicate and water are stirred uniformly, stand and add kayexalate, after heating up and being incubated, cooling, it is freeze-dried again, crush, sieving, collect sieving particle, additive can be obtained, then by dolomite, magnesite is crushed, collect crushed mixture, by crushed mixture, sodium hydroxide solution and benzene sulfonic acid sodium salt are well mixed, stand, filtering, dried after filter residue is rinsed, after magnetic separation removal, with borax, additive and calcium hydroxide are milled, calcining, ball milling and standing digest, collect digestion mixture, digestion mixture is subjected to extrusion forming, collect extrudate, through drying.Sintering, crushing.Calcium and magnesium sand apparent porosity prepared by the present invention is low, with higher compactness, while being difficult by aquation, water repelling property is good.
Description
Technical field
The present invention relates to a kind of calcium magnesite and preparation method thereof, belong to technical field of refractory materials.
Background technology
Magnesium calcium material has excellent high-temperature behavior and using effect, and magnesite-chrome brick can be replaced to be used for cement kiln high-temperature band,
The pollution of Cr VI is avoided, is a kind of refractory material of non-environmental-pollution.Produce the raw material dolomite and stone used in magnesium calcium material
Grey stone ore reserves are big, abundant more than magnesite resource；And conite ore deposit is widely distributed, almost each save has, and makes
It can be gathered materials on the spot during, development magnesium calcium material is more economical rationally.MgO-CaO refractory turns into the hair of basic refractory
Exhibition trend.The magnesium calcium material of China is mainly used in AOD, VOD refining furnace furnace lining, and its application is extensive not enough.Due to me
The running rate of state's cement kiln is low, magnesia-calcium brick cement kiln produce the intermittent phase because aquation is broken down into granular state, it is impossible in water
It is used widely in stall clinkering zone.Magnesium calcium material has been required for good preventing hydration during production, transport and storage
Measure, the application to magnesium calcium product brings very big difficulty, and easy hydrability is the restriction wide variety of principal element of magnesium calcium material.
Improve at present magnesium calcium material hydration resistance measure be concentrated mainly on raising raw material sintering temperature, addition agglutinant and
Material surface smears organic matter to reach reduction CaO and H2O reactivities, improve the purpose of hydration-resisting, but in magnesium calcium material
CaO exists still in the form of free state, it is difficult to solve the characteristic of easy aquation.
Therefore, to develop magnesium calcium material, the easy hydration characteristics of magnesium calcium material need to be solved.
The content of the invention
The technical problems to be solved by the invention：Exist for the CaO in current magnesium calcium material still in the form of free state,
It is difficult to which there is provided a kind of calcium magnesite and preparation method thereof for the problem of solving easy hydration characteristics.
In order to solve the above technical problems, the present invention is using technical scheme as described below：
A kind of calcium magnesite, it is characterised in that include the raw material of following parts by weight, 100~110 portions of dolomites, 80~90 portions of water chestnuts
Magnesium ore deposit, 25~30 parts of boraxs, 10~15 parts of additives, 6~8 parts of calcium hydroxides.
The preparation of the additive, comprises the following steps：
A. in mass ratio 1:3:4, take lithia, sodium metasilicate and water to be put into container and stir, adjusted using sodium hydroxide solution
PH to 8.5~9.5 is saved, is stood；
B. after standing terminates, kayexalate is added into container, 50~55 DEG C are warming up to, insulation is cooled to room temperature,
Material in container is freeze-dried, freeze-drying thing is collected, crushes, sieving collects sieving particle, you can must add
Material.
Kayexalate addition is the 3~5% of sodium metasilicate quality in the step B.
The preparation method of described calcium magnesite, comprises the following steps：
（1）Matched according to parts by weight, progress takes raw material；
（2）Dolomite, magnesite are crushed, crushed mixture is collected, by crushed mixture, sodium hydroxide solution and benzene sulphur
Sour sodium is well mixed, and is stood, and filter residue is collected in filtering, is rinsed filter residue to flushing liquor in neutrality using water, is collected the filter after rinsing
Slag；
（3）Filter residue after flushing is dried, magnetic separation removal, collect removal of impurities after material, by the material after removal of impurities, borax,
Additive and calcium hydroxide are milled, and collect mill admixture；
（4）Mill admixture is calcined at 1000~1100 DEG C, calcined material is collected, calcined material is put into ball mill, then is added
Enter water and carry out ball milling, collect ball-milled mixtures, stand digestion, collect digestion mixture；
（5）Digestion mixture is subjected to extrusion forming, extrudate is collected, dries, dried extrudate is sintered, is collected
Sinter, is crushed, and collects crushed material, you can obtain calcium magnesite.
The step（2）The mass ratio of middle crushed mixture, sodium hydroxide solution and benzene sulfonic acid sodium salt is 4~5:7~9:0.6
~1.8.
The step（4）The addition of reclaimed water is the 40~50% of calcined material quality.
The step（5）Middle sintering process is to be warming up to 700~800 DEG C with 8 DEG C/min, is incubated 5~7h, then be warming up to
1800~1900 DEG C, 4~6h is incubated, carbon dioxide is passed through with 15mL/min in sintering process, you can.
The present invention is compared with other method, and advantageous effects are：
（1）The present invention removes aluminium therein using alkali lye, removed by magnetic separation therein using dolomite, magnesite as raw material
Iron, prevents metal oxide impurities therein to the durothermic influence of calcium magnesite, while promoting the formation of crystal grain and growing up, promotes
Agglomeration；
（2）The present invention with the addition of sodium metasilicate so as to the combination of the storeroom in extrusion process, while using lithia to reduce burning
Junction temperature, makes it form micro liquid phase under low-temperature condition, with the space between filler particles material, has reached fine and close effect,
Improve hydration resistance；
（3）The present invention with the addition of borax, the conjugate of calcium oxide and boron oxide in sintering process, reduce containing for free calcium oxide
Amount, and tridimensional network is formed with magnesia, while there is the depth of water fashionable, in the presence of lithium, form calcium oxide, oxidation
The conjugate of boron and water, combines water with reference state formation, further improves hydration resistance；
（4）Present invention increase calcium hydroxide, makes in sintering process, the formation of highly active calcium oxide, while in sintering process,
Carbon dioxide is passed through, so that surface forms the protective layer of carbonate.
Embodiment
The preparation of additive：
A. in mass ratio 1:3:4, take lithia, sodium metasilicate and water to be put into container, 10~15min is stirred with 600r/min, receive
Collection stirring mixture stands 4~6h using 1.8mol/L sodium hydroxide solution regulation pH to 8.5~9.5；
B. after standing terminates, the kayexalate of sodium metasilicate quality 3~5% is added into container, 50~55 are warming up to
DEG C, 1~2h is incubated, room temperature is cooled to, the material in container is put into freeze drier and is freeze-dried, freezing is collected dry
Dry thing, and crushing in pulverizer is put into, 200 mesh sieves are crossed, sieving particle are collected, you can obtain additive.
The calcium magnesite of the present invention, includes the raw material of following parts by weight, 100~110 parts of dolomites, 80~90 parts of magnesites
Ore deposit, 25~30 parts of boraxs, 10~15 parts of additives, 6~8 parts of calcium hydroxides.
The preparation method of calcium magnesite of the present invention, comprises the following steps：
（1）Matched according to parts by weight, progress takes raw material；
（2）Dolomite, magnesite are put into pulverizer 20~30min is crushed with 900r/min, crushed mixture is collected, by matter
Measure ratio 4~5:7~9:0.6~1.8, crushed mixture, sodium hydroxide solution and benzene sulfonic acid sodium salt are well mixed, 2~4h is stood,
Filtering, collects filter residue, rinses filter residue to flushing liquor in neutrality using water, collects the filter residue after rinsing；
（3）Filter residue after flushing is put into 100 DEG C of baking ovens and dried, places into and magnetic separation removal is carried out in magnetic separator, removal of impurities is collected
Material afterwards, the material after removal of impurities, borax, additive and calcium hydroxide are put into grinding mill and milled, and collection is milled mixed
Compound；
（4）Mill admixture is calcined into 1~2h at 1000~1100 DEG C, calcined material is collected, calcined material is put into ball mill,
A diameter of 60mm of 4~6 times of calcined material quality steel ball is added, the water of calcined material quality 40~50% is added, with 600r/
Min 70~90min of ball milling, collect ball-milled mixtures, and 1~2h of digestion is stood at 30~35 DEG C, digestion mixture is collected；
（5）Digestion mixture is put into extruder, extrusion forming is carried out with 20MPa, extrudate is collected, is put into drying box and does
It is dry, dried extrudate is put into calcining furnace and is sintered, 700~800 DEG C are warming up to 8 DEG C/min, 5~7h is incubated,
1800~1900 DEG C are warming up to again, 4~6h is incubated, carbon dioxide is passed through with 15mL/min in sintering process, collect sinter,
Crush, collect crushed material, you can obtain calcium magnesite.
Example 1
The preparation of additive：
A. in mass ratio 1:3:4, take lithia, sodium metasilicate and water to be put into container, 15min is stirred with 600r/min, collection is stirred
Sodium hydroxide solution regulation pH to 9.5 of the mixture using 1.8mol/L is mixed, 6h is stood；
B. after standing terminates, the kayexalate of sodium metasilicate quality 5% is added into container, 55 DEG C, insulation are warming up to
2h, is cooled to room temperature, and the material in container is put into freeze drier and is freeze-dried, and collects freeze-drying thing, and put
Enter in pulverizer and crush, cross 200 mesh sieves, collect sieving particle, you can obtain additive.
The calcium magnesite of the present invention, includes the raw material of following parts by weight, 110 parts of dolomites, 90 parts of magnesite, 30 parts of boron
Sand, 15 parts of additives, 8 parts of calcium hydroxides.
The preparation method of calcium magnesite of the present invention, comprises the following steps：
（1）Matched according to parts by weight, progress takes raw material；
（2）Dolomite, magnesite are put into pulverizer 30min is crushed with 900r/min, collect crushed mixture, in mass ratio
5:9:1.8, crushed mixture, sodium hydroxide solution and benzene sulfonic acid sodium salt are well mixed, 4h is stood, filtering is collected filter residue, used
Water rinses filter residue to flushing liquor in neutrality, collects the filter residue after rinsing；
（3）Filter residue after flushing is put into 100 DEG C of baking ovens and dried, places into and magnetic separation removal is carried out in magnetic separator, removal of impurities is collected
Material afterwards, the material after removal of impurities, borax, additive and calcium hydroxide are put into grinding mill and milled, and collection is milled mixed
Compound；
（4）Mill admixture is calcined into 2h at 1100 DEG C, calcined material is collected, calcined material is put into ball mill, calcining is added
A diameter of 60mm of 6 times of amount of substance steel ball, adds the water of calcined material quality 50%, with 600r/min ball milling 90min, collects
Ball-milled mixtures, digestion 2h is stood at 35 DEG C, digestion mixture is collected；
（5）Digestion mixture is put into extruder, extrusion forming is carried out with 20MPa, extrudate is collected, is put into drying box and does
It is dry, dried extrudate is put into calcining furnace and is sintered, 800 DEG C are warming up to 8 DEG C/min, 7h is incubated, then be warming up to
1900 DEG C, 6h is incubated, carbon dioxide is passed through with 15mL/min in sintering process, sinter is collected, crushed, crushed material is collected,
Calcium magnesite can be obtained.
Example 2
The preparation of additive：
A. in mass ratio 1:3:4, take lithia, sodium metasilicate and water to be put into container, 10min is stirred with 600r/min, collection is stirred
Sodium hydroxide solution regulation pH to 8.5 of the mixture using 1.8mol/L is mixed, 4h is stood；
B. after standing terminates, the kayexalate of sodium metasilicate quality 3% is added into container, 50 DEG C, insulation are warming up to
1h, is cooled to room temperature, and the material in container is put into freeze drier and is freeze-dried, and collects freeze-drying thing, and put
Enter in pulverizer and crush, cross 200 mesh sieves, collect sieving particle, you can obtain additive.
The calcium magnesite of the present invention, includes the raw material of following parts by weight, 100 parts of dolomites, 80 parts of magnesite, 25 parts of boron
Sand, 10 parts of additives, 6 parts of calcium hydroxides.
The preparation method of calcium magnesite of the present invention, comprises the following steps：
（1）Matched according to parts by weight, progress takes raw material；
（2）Dolomite, magnesite are put into pulverizer 20min is crushed with 900r/min, collect crushed mixture, in mass ratio
4:7:0.6, crushed mixture, sodium hydroxide solution and benzene sulfonic acid sodium salt are well mixed, 2h is stood, filtering is collected filter residue, used
Water rinses filter residue to flushing liquor in neutrality, collects the filter residue after rinsing；
（3）Filter residue after flushing is put into 100 DEG C of baking ovens and dried, places into and magnetic separation removal is carried out in magnetic separator, removal of impurities is collected
Material afterwards, the material after removal of impurities, borax, additive and calcium hydroxide are put into grinding mill and milled, and collection is milled mixed
Compound；
（4）Mill admixture is calcined into 1h at 1000 DEG C, calcined material is collected, calcined material is put into ball mill, calcining is added
A diameter of 60mm of 4 times of amount of substance steel ball, adds the water of calcined material quality 40%, with 600r/min ball milling 70min, collects
Ball-milled mixtures, digestion 1h is stood at 30 DEG C, digestion mixture is collected；
（5）Digestion mixture is put into extruder, extrusion forming is carried out with 20MPa, extrudate is collected, is put into drying box and does
It is dry, dried extrudate is put into calcining furnace and is sintered, 700 DEG C are warming up to 8 DEG C/min, 5h is incubated, then be warming up to
1800 DEG C, 4h is incubated, carbon dioxide is passed through with 15mL/min in sintering process, sinter is collected, crushed, crushed material is collected,
Calcium magnesite can be obtained.
Example 3
The preparation of additive：
A. in mass ratio 1:3:4, take lithia, sodium metasilicate and water to be put into container, 12min is stirred with 600r/min, collection is stirred
Sodium hydroxide solution regulation pH to 9.0 of the mixture using 1.8mol/L is mixed, 5h is stood；
B. after standing terminates, the kayexalate of sodium metasilicate quality 4% is added into container, 52 DEG C, insulation are warming up to
1h, is cooled to room temperature, and the material in container is put into freeze drier and is freeze-dried, and collects freeze-drying thing, and put
Enter in pulverizer and crush, cross 200 mesh sieves, collect sieving particle, you can obtain additive.
The calcium magnesite of the present invention, includes the raw material of following parts by weight, 105 parts of dolomites, 85 parts of magnesite, 27 parts of boron
Sand, 12 parts of additives, 7 parts of calcium hydroxides.
The preparation method of calcium magnesite of the present invention, comprises the following steps：
（1）Matched according to parts by weight, progress takes raw material；
（2）Dolomite, magnesite are put into pulverizer 25min is crushed with 900r/min, collect crushed mixture, in mass ratio
4:8:1.2, crushed mixture, sodium hydroxide solution and benzene sulfonic acid sodium salt are well mixed, 3h is stood, filtering is collected filter residue, used
Water rinses filter residue to flushing liquor in neutrality, collects the filter residue after rinsing；
（3）Filter residue after flushing is put into 100 DEG C of baking ovens and dried, places into and magnetic separation removal is carried out in magnetic separator, removal of impurities is collected
Material afterwards, the material after removal of impurities, borax, additive and calcium hydroxide are put into grinding mill and milled, and collection is milled mixed
Compound；
（4）Mill admixture is calcined into 1h at 1050 DEG C, calcined material is collected, calcined material is put into ball mill, calcining is added
A diameter of 60mm of 5 times of amount of substance steel ball, adds the water of calcined material quality 45%, with 600r/min ball milling 80min, collects
Ball-milled mixtures, digestion 2h is stood at 32 DEG C, digestion mixture is collected；
（5）Digestion mixture is put into extruder, extrusion forming is carried out with 20MPa, extrudate is collected, is put into drying box and does
It is dry, dried extrudate is put into calcining furnace and is sintered, 750 DEG C are warming up to 8 DEG C/min, 6h is incubated, then be warming up to
1850 DEG C, 5h is incubated, carbon dioxide is passed through with 15mL/min in sintering process, sinter is collected, crushed, crushed material is collected,
Calcium magnesite can be obtained.
Reference examples：The calcium magnesite of Dashiqiao City Co., Ltd production.
The calcium magnesite of example and reference examples is detected, specific detection is as follows：
1. apparent porosity is determined：The apparent porosity of calcium magnesite is determined according to GB/T 2997-2000, measure medium is kerosene.
2. water repelling property is determined：Calcium magnesite is screened, 2.5~4.0mm particle is filtered out, by particle in 110 DEG C
Lower drying is to constant weight, then is placed in beaker, sealed beaker, beaker is put into the autoclave added water, is heated to kettle internal pressure
Power reach the calcium magnesite particle after aquation is tested after 0.2MPa, 2h take out, and be placed in 110 DEG C of baking ovens dry to constant weight, then
With the fine powder weeded out less than 1mm, pulverization rate is calculated, calculation formula is as follows：
Pulverization rate=
Wherein W1（g）It is the weight of 2.5~4.0mm particle, W2（g）It is the weight after weeding out less than 1mm after efflorescence.
Specific test result such as table 1.
Table 1
| Example 1 | Example 2 | Example 3 | Reference examples | |
| Apparent porosity（%） | 0.456 | 0.458 | 0.448 | 0.562 |
| Pulverization rate（%） | 10.5 | 10.2 | 10.6 | 13.2 |
As shown in Table 1, the calcium magnesite apparent porosity that prepared by the present invention is low, with preferable compactness, while pulverization rate is low, is difficult
By aquation.
Claims (7)
1. a kind of calcium magnesite, it is characterised in that include the raw material of following parts by weight, 100~110 parts of dolomites, 80~90 parts
Magnesite, 25~30 parts of boraxs, 10~15 parts of additives, 6~8 parts of calcium hydroxides.
2. calcium magnesite according to claim 1, it is characterised in that the preparation of the additive, comprises the following steps：
A. in mass ratio 1:3:4, take lithia, sodium metasilicate and water to be put into container and stir, adjusted using sodium hydroxide solution
PH to 8.5~9.5 is saved, is stood；
B. after standing terminates, kayexalate is added into container, 50~55 DEG C are warming up to, insulation is cooled to room temperature,
Material in container is freeze-dried, freeze-drying thing is collected, crushes, sieving collects sieving particle, you can must add
Material.
3. calcium magnesite according to claim 2, it is characterised in that kayexalate addition is in the step B
The 3~5% of sodium metasilicate quality.
4. a kind of preparation method of calcium magnesite as claimed in claim 1, it is characterised in that comprise the following steps：
（1）Matched according to parts by weight, progress takes raw material；
（2）Dolomite, magnesite are crushed, crushed mixture is collected, by crushed mixture, sodium hydroxide solution and benzene sulphur
Sour sodium is well mixed, and is stood, and filter residue is collected in filtering, is rinsed filter residue to flushing liquor in neutrality using water, is collected the filter after rinsing
Slag；
（3）Filter residue after flushing is dried, magnetic separation removal, collect removal of impurities after material, by the material after removal of impurities, borax,
Additive and calcium hydroxide are milled, and collect mill admixture；
（4）Mill admixture is calcined at 1000~1100 DEG C, calcined material is collected, calcined material is put into ball mill, then is added
Enter water and carry out ball milling, collect ball-milled mixtures, stand digestion, collect digestion mixture；
（5）Digestion mixture is subjected to extrusion forming, extrudate is collected, dries, dried extrudate is sintered, is collected
Sinter, is crushed, and collects crushed material, you can obtain calcium magnesite.
5. the preparation method of calcium magnesite according to claim 4, it is characterised in that the step（2）Middle crushed mixture,
The mass ratio of sodium hydroxide solution and benzene sulfonic acid sodium salt is 4~5:7~9:0.6~1.8.
6. the preparation method of calcium magnesite according to claim 4, it is characterised in that the step（4）The addition of reclaimed water
For the 40~50% of calcined material quality.
7. the preparation method of calcium magnesite according to claim 4, it is characterised in that the step（5）Middle sintering process is
700~800 DEG C are warming up to 8 DEG C/min, 5~7h is incubated, then be warming up to 1800~1900 DEG C, 4~6h of insulation, in sintering process
In carbon dioxide is passed through with 15mL/min, you can.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109369198A (en) * | 2018-11-23 | 2019-02-22 | 武汉科技大学 | A kind of MgO-CaO particle and preparation method thereof |
| CN112875738A (en) * | 2021-02-01 | 2021-06-01 | 大冶市鑫鼎实业有限公司 | Process for refining dolomite purity by decomposition and desulfurization |
| CN113773057A (en) * | 2021-09-24 | 2021-12-10 | 山西禄纬堡太钢耐火材料有限公司 | High-purity and high-density calcium magnesia and preparation process thereof |
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- 2017-06-28 CN CN201710510635.XA patent/CN107188581A/en active Pending
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| CN109369198A (en) * | 2018-11-23 | 2019-02-22 | 武汉科技大学 | A kind of MgO-CaO particle and preparation method thereof |
| CN112875738A (en) * | 2021-02-01 | 2021-06-01 | 大冶市鑫鼎实业有限公司 | Process for refining dolomite purity by decomposition and desulfurization |
| CN113773057A (en) * | 2021-09-24 | 2021-12-10 | 山西禄纬堡太钢耐火材料有限公司 | High-purity and high-density calcium magnesia and preparation process thereof |
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