CN103523791B - Preparation method of additive for electric grade magnesium oxide - Google Patents
Preparation method of additive for electric grade magnesium oxide Download PDFInfo
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- CN103523791B CN103523791B CN201210512865.7A CN201210512865A CN103523791B CN 103523791 B CN103523791 B CN 103523791B CN 201210512865 A CN201210512865 A CN 201210512865A CN 103523791 B CN103523791 B CN 103523791B
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- magnesium oxide
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- high temperature
- additive
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 39
- 239000000654 additive Substances 0.000 title claims abstract description 37
- 230000000996 additive effect Effects 0.000 title claims abstract description 36
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 14
- 150000001639 boron compounds Chemical class 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 12
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000391 magnesium silicate Substances 0.000 claims abstract description 10
- 229910052919 magnesium silicate Inorganic materials 0.000 claims abstract description 10
- 235000019792 magnesium silicate Nutrition 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 7
- 239000010431 corundum Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 4
- 229910006295 Si—Mo Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000001354 calcination Methods 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract 3
- 238000000227 grinding Methods 0.000 abstract 2
- 238000005485 electric heating Methods 0.000 abstract 1
- 238000007873 sieving Methods 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Landscapes
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to the technical field of magnesium oxide and in particular relates to a preparation method of an additive for electric grade magnesium oxide. The preparation method of the additive for the electric grade magnesium oxide comprises the following steps: 1) weighing magnesium oxide and silicon dioxide; 2) mixing in a mixing stirrer to obtain a mixture; 3) placing the obtained mixture into a corundum sagger, calcining in a high temperature furnace, preserving heat, carrying out furnace cooling, and discharging; 4) cooling the obtained material to room temperature, adding a boron compound, and stirring in an another stirrer; 5) calcining the material obtained in the step 4) in a high temperature furnace, and preserving heat; and 6) cooling the material obtained in the step 5) to room temperature, grinding by adopting a mechanical grinding machine, and sieving by virtue of a screen, thus the additive containing magnesium silicate is obtained. Due to the adoption of the technical scheme, after the obtained additive is added into electrically molten magnesium oxide, a leakage current of electric grade high temperature magnesium oxide can be greatly reduced, so that the aim of improving product quality of an electric heating element can be achieved.
Description
Technical field
The present invention relates to technical field of magnesium oxide, be specifically related to a kind of preparation method of magnesia additive.
Background technology
Electrician's level high-temperature oxydation magnesium be mainly used in make serviceability temperature higher, 1050 DEG C of heat treated electrical heating elements can be born.Electrically molten magnesia improves electrical property by adding a kind of additive containing magnesium silicate in electrically molten magnesia, by improving the leakage current of electrical heating elements after making electrical heating elements, is thus widely used as the inserts of heating.Affect electrician's level high-temperature oxydation magnesium leakage current factor a lot, one of them important factor is exactly the quality of the specialist additive of electrician's level high-temperature oxydation magnesium.
Summary of the invention
The object of the invention is to, a kind of preparation method of fused magnesium oxide additive is provided, solves above technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
A preparation method for fused magnesium oxide additive, comprises the steps:
1) magnesia and silica that weight ratio is 1 ~ 2:1 ~ 3 is taken;
2) Homogeneous phase mixing 25 minutes ~ 35 minutes in mixing agitator, obtains compound;
3) step 2) compound that obtains is placed in corundum sagger, and calcine in 1300 DEG C ~ 1600 DEG C high temperature furnaces, be incubated 120 minutes ~ 180 minutes, then cool to 480 DEG C ~ 520 DEG C dischargings with the furnace;
4) be cooled to the weight portion of the material interpolation boron compound 1% ~ 4% that room temperature obtains according to step 3), stir 25 minutes ~ 35 minutes in another agitator;
5) high temperature furnace that the material that step 4) obtains is placed in 400 DEG C ~ 600 DEG C is calcined, be incubated 60 minutes ~ 120 minutes;
6) material that step 5) obtains is cooled to room temperature, pulverizes with mechanical crusher, and sieve through 70 order ~ 90 eye mesh screens, namely obtain the additive containing magnesium silicate.
The present invention adopts above-mentioned magnesia and silica to be raw material, take boron compound as additive, the electrician's level high-temperature oxydation magnesium additive obtained through high―temperature nuclei magnesium silicate, is different from other prior aries the fused magnesium oxide additive utilizing natural crystal method to produce.Adopt the additive that preparation method of the present invention is made, the additive that what its electrical property was large absolutely be better than utilizes natural crystal method to produce.
Step 2) in, preferably Homogeneous phase mixing 30 minutes in mixing agitator.
In step 3), preferably cool to 500 DEG C of dischargings with the furnace.
High temperature furnace in step 3) can be box Si-Mo rod resistance furnace, also can be high temperature converter, after using high temperature converter, can realize continuous prodution, realize industrialization.
In step 4), preferably stir 30 minutes in another agitator.
In step 6), preferably adopt 80 eye mesh screens to sieve, obtain additive.
In order to obtain suitable processing characteristics, in step 1), the magnesia preferably adopted and the order number of silica are 100 order ~ 200 object powders, are convenient to processing.
Beneficial effect: owing to adopting above technical scheme, after electrician's level high-temperature oxydation magnesium additive that the present invention obtains adds electrically molten magnesia to, significantly can reduce the leakage current of electrician's level high-temperature oxydation magnesium, thus reach and improve final products, i.e. the product quality of electrical heating elements.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further below in conjunction with concrete diagram.
With reference to Fig. 1, a kind of preparation method of fused magnesium oxide additive, comprises the steps:
The first step, feeding: take magnesia and silica that weight ratio is 1 ~ 2:1 ~ 3.In order to obtain suitable processing characteristics, the magnesia preferably adopted and the order number of silica are 100 order ~ 200 object powders, are convenient to processing.
Second step, mixing: Homogeneous phase mixing 30 minutes in mixing agitator, obtains compound.
3rd step, calcining: the compound that second step obtains is placed in corundum sagger, calcines in 1300 DEG C ~ 1600 DEG C high temperature furnaces, be incubated 120 minutes ~ 180 minutes, then cool to 500 DEG C with the furnace, discharging.Wherein, high temperature furnace can be box Si-Mo rod resistance furnace, also can be high temperature converter, after using high temperature converter, both can make the additive quality stable homogeneous finally obtained, and can also realize continuous prodution, realize industrialization.
4th step, reinforced mixing: material step 3) obtained is cooled to room temperature, add boron compound, boron compound addition is 1% ~ 4% weight ratio that step 3) is cooled to the material that room temperature obtains, and stirs 30 minutes in another agitator.
5th step, calcines: the high temperature furnace material that the 4th step obtains being placed in 400 DEG C ~ 600 DEG C is calcined, and is incubated 60 ~ 120 minutes again;
6th step, pulverizes and sieves: the material that the 5th step obtains is cooled to room temperature, pulverizes with mechanical crusher, and sieve through 80 eye mesh screens, namely obtains the additive containing magnesium silicate.
Embodiment one:
Comprise following weight ratio composition: magnesia 1 weight portion, silica 1 .75 weight portion, boron compound 2.15%.
Choose the magnesia of 1 weight portion and the silica of 1.75 weight portions, in mixing agitator, Homogeneous phase mixing 25 minutes, obtains compound.The compound obtained is placed in corundum sagger, calcines in 1300 DEG C of high temperature converters, be incubated 120 minutes, then cool to 480 DEG C of dischargings with the furnace.Material after discharging is cooled to room temperature, adds the boron compound of 2.15%, stir 30 minutes in another agitator.The high temperature furnace material obtained being placed in 400 DEG C is calcined, and is incubated 60 minutes.The material obtained is cooled to room temperature, pulverizes with mechanical crusher, and sieve through 70 eye mesh screens, namely obtain the additive containing magnesium silicate.
Embodiment two:
Comprise following weight ratio composition: magnesia 1.85 weight portion, silica 2.55 weight portion, boron compound 1.35%.
Choose the magnesia of 1.85 weight portions and the silica of 2.55 weight portions, in mixing agitator, Homogeneous phase mixing 35 minutes, obtains compound.The compound obtained is placed in corundum sagger, calcines in 1600 DEG C of high temperature converters, be incubated 180 minutes, then cool to 520 DEG C of dischargings with the furnace.Material after discharging is cooled to room temperature, adds the boron compound of 1.35%, stir 35 minutes in another agitator.The high temperature furnace material obtained being placed in 600 DEG C is calcined, and is incubated 120 minutes.The material obtained is cooled to room temperature, pulverizes with mechanical crusher, and sieve through 90 eye mesh screens, namely obtain the additive containing magnesium silicate.
Embodiment three:
Comprise following weight ratio composition: magnesia 1.5 weight portion, silica 2.85 weight portion, boron compound 2.5%.
Choose the magnesia of 1.5 weight portions and the silica of 2.85 weight portions, in mixing agitator, Homogeneous phase mixing 30 minutes, obtains compound.The compound obtained is placed in corundum sagger, calcines in 1500 DEG C of high temperature converters, be incubated 150 minutes, then cool to 500 DEG C of dischargings with the furnace.Material after discharging is cooled to room temperature, adds the boron compound of 2.5%, stir 30 minutes in another agitator.The high temperature furnace material obtained being placed in 500 DEG C is calcined, and is incubated 90 minutes.The material obtained is cooled to room temperature, pulverizes with mechanical crusher, and sieve through 80 eye mesh screens, namely obtain the additive containing magnesium silicate.
With the auxiliary agent (for H auxiliary agent) produced with natural crystal method containing the additive (for Ms auxiliary agent) of magnesium silicate that above-mentioned embodiment two method is produced, these additives are added in electrically molten magnesia powder to the leakage current contrast of producing electrician's level high-temperature oxydation magnesium, comparing result is as follows:
Note: leakage current tester device is: PA30 type numeral leakage current tester, testing tube table load is 10w/cm
2
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. a preparation method for fused magnesium oxide additive, is characterized in that, comprises the steps:
1) magnesia and silica that weight ratio is 1 ~ 2:1 ~ 3 is taken;
2) Homogeneous phase mixing 25 minutes ~ 35 minutes in mixing agitator, obtains compound;
3) step 2) compound that obtains is placed in corundum sagger, and calcine in 1300 DEG C ~ 1600 DEG C high temperature furnaces, be incubated 120 minutes ~ 180 minutes, then cool to 480 DEG C ~ 520 DEG C dischargings with the furnace;
4) material that step 3) obtains is cooled to room temperature, adds the boron compound of 1% ~ 4%, stir 25 minutes ~ 35 minutes in another agitator;
5) high temperature furnace that the material that step 4) obtains is placed in 400 DEG C ~ 600 DEG C is calcined, be incubated 60 ~ 120 minutes;
6) material that step 5) obtains is cooled to room temperature, pulverizes with mechanical crusher, and sieve through 70 order ~ 90 eye mesh screens, namely obtain the additive containing magnesium silicate.
2. the preparation method of a kind of fused magnesium oxide additive according to claim 1, is characterized in that, step 2) in, in mixing agitator, Homogeneous phase mixing 30 minutes, obtains compound.
3. the preparation method of a kind of fused magnesium oxide additive according to claim 2, is characterized in that, in step 3), cools to 500 DEG C of dischargings with the furnace.
4. the preparation method of a kind of fused magnesium oxide additive according to claim 1, is characterized in that, the high temperature furnace in step 3) adopts box Si-Mo rod resistance furnace.
5. the preparation method of a kind of fused magnesium oxide additive according to claim 1, is characterized in that, the high temperature furnace in step 3) adopts high temperature converter.
6. the preparation method of a kind of fused magnesium oxide additive as claimed in any of claims 1 to 5, is characterized in that, in step 4), stirs 30 minutes in another agitator.
7. the preparation method of a kind of fused magnesium oxide additive according to claim 1, is characterized in that, in step 6), adopts 80 eye mesh screens to sieve, obtains additive.
8. the preparation method of a kind of fused magnesium oxide additive according to claim 1 or 7, is characterized in that, in order to obtain suitable processing characteristics, in step 1), the magnesia of employing and the order number of silica are 100 order ~ 200 object powders.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210512865.7A CN103523791B (en) | 2012-12-04 | 2012-12-04 | Preparation method of additive for electric grade magnesium oxide |
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| CN201210512865.7A CN103523791B (en) | 2012-12-04 | 2012-12-04 | Preparation method of additive for electric grade magnesium oxide |
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| CN103523791A CN103523791A (en) | 2014-01-22 |
| CN103523791B true CN103523791B (en) | 2015-04-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106116531A (en) * | 2016-06-17 | 2016-11-16 | 辽宁嘉顺化工科技有限公司 | Fused magnesium oxide powder prevention ferrum-chromium-aluminum blackout and anti-oxidation magnesium blackening agent for surface and preparation method thereof |
| CN107200591B (en) * | 2017-03-16 | 2020-04-07 | 营口松辽镁业有限公司 | Method for preparing electrical magnesium oxide powder additive |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559962A (en) * | 2009-05-27 | 2009-10-21 | 上海实业振泰化工有限公司 | Method for preparing high-viscosity silicon-steel grade magnesium oxide |
| CN102211783A (en) * | 2011-04-15 | 2011-10-12 | 上海实业振泰化工有限公司 | Method for reducing content of magnetic substances in electrical engineering grade magnesium oxide |
| CN102276170A (en) * | 2010-06-11 | 2011-12-14 | 李葵荣 | Smelting method for electrical-level magnesia powder fused magnesia |
| CN102765735A (en) * | 2012-05-22 | 2012-11-07 | 上海实业振泰化工有限公司 | Production method of special additive for electrical high temperature magnesium oxide |
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- 2012-12-04 CN CN201210512865.7A patent/CN103523791B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559962A (en) * | 2009-05-27 | 2009-10-21 | 上海实业振泰化工有限公司 | Method for preparing high-viscosity silicon-steel grade magnesium oxide |
| CN102276170A (en) * | 2010-06-11 | 2011-12-14 | 李葵荣 | Smelting method for electrical-level magnesia powder fused magnesia |
| CN102211783A (en) * | 2011-04-15 | 2011-10-12 | 上海实业振泰化工有限公司 | Method for reducing content of magnetic substances in electrical engineering grade magnesium oxide |
| CN102765735A (en) * | 2012-05-22 | 2012-11-07 | 上海实业振泰化工有限公司 | Production method of special additive for electrical high temperature magnesium oxide |
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| CN103523791A (en) | 2014-01-22 |
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