CN109437607A - A kind of preparation method of high-density sintered magnesia - Google Patents
A kind of preparation method of high-density sintered magnesia Download PDFInfo
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- CN109437607A CN109437607A CN201910025453.2A CN201910025453A CN109437607A CN 109437607 A CN109437607 A CN 109437607A CN 201910025453 A CN201910025453 A CN 201910025453A CN 109437607 A CN109437607 A CN 109437607A
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- magnesite
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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
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
Abstract
The invention discloses a kind of preparation method of high-density sintered magnesia, the present invention uses magnesite for raw material, and bulk density >=3.40g/cm is made by fine grinding and purification by floatation, ultra-fine grinding and grinding, light-burned decomposition, formed product and calcine technology3High-density sintered magnesia, with weight MgO >=97.5%, CaO/SiO in constituent2≥2；Present invention process process is simple, energy conservation and environmental protection, is particularly suitable for processing low-grade magnesite, can efficiently utilize magnesite resource.
Description
Technical field
The present invention relates to refractory products manufacturing technology field more particularly to a kind of preparation sides of high-density sintered magnesia
Method.
Background technique
Magnesite clinker is the primary raw material for producing magnesia refractories.The performance of magnesite clinker, especially magnesite clinker
Bulk density, which invades performance and elevated temperature strength for the anti-slag of refractory material, has great influence, directly affects the use of refractory material
Service life.The high-end market of fire resisting material in the world is MgO≤97.5% to the definition of the content of high-grade magnesite clinker, Ti product Mi Du≤
3.40g/cm3.Result of study and production practices show Ti product Mi Du≤3.40g/cm when magnesite clinker3When, prepared fire resisting
The service performance of material significantly improves, and service life is one times of general density magnesite clinker.In addition, this high-density sintered magnesium
Sand can substitute fused magnesite and use as refractory raw material, can not only save the energy in this way, reduce environmental pollution, while may be used also
Refractory raw material cost is greatly lowered.
Production technology used by the magnesite clinker of most enterprise production at present are as follows: magnesite-purification by floatation-magnesia unslacked-
Levigate-molding-magnesite clinker.The magnesite clinker produced using above-mentioned technique, most high-density can only achieve 3.25~
3.30g/cm3, because being unable to satisfy the export requirement of use demand and high-grade magnesia, thus cause the very big wave of magnesia resource
Take.
The magnesite in China belongs to coarse-crystalline mine system, and the MgO generated after decomposing remains magnesium carbonate, i.e. MgCO3It is " false
It is brilliant " structure.Since this " pseudomorphic crystal " structure hinders the sintering of MgO, it is difficult to obtain densification using traditional processing technology
High-density sintered magnesia.
In order to destroy as magnesite decompose brought by " pseudomorphic crystal " structure, earlier patent application once passed through feed change type
(being detailed in Authorization Notice No. CN1301228C " a kind of preparation method of magnesite clinker "), and it is close to use following technique to be prepared for volume
Degree is greater than 3.40g/cm3High-density sintered magnesia, i.e., obtained using the primary light-burned~multiple hydration process of progress of magnesite~warp
Light-burned light calcined magnesia~molding~magnesite clinker is obtained through secondary to magnesium hydroxide~again.From the process above it is found that being terrible
To high-density sintered magnesia, by the magnesia unslacked that above-mentioned technique prepares magnesite clinker be decomposed by magnesium hydroxide come.I.e. should
The magnesite clinker of technique is first to convert magnesium hydroxide for magnesite raw material, then high density is manufactured using magnesium hydroxide as raw material
Magnesite clinker, rather than high-density sintered magnesia is directly produced as raw material using magnesite.Although can be with using above-mentioned technique
It prepares bulk density and is greater than 3.40g/cm3High-density sintered magnesia, but due to needing by the conversion of light-burned twice and raw material, with
And multiple aquation, filtering, the technical process such as cooling and dry keep production technology many and diverse, production cost is significantly increased.Therefore difficult
To promote and be widely applied.
Summary of the invention
For deficiency existing for the above-mentioned prior art and process and defect, the present invention provides a kind of high-purity, Gao Ti
The preparation method of product density magnesite clinker.The preparation method is that using magnesite as raw material, by two-stage grinding and once
Purification by floatation ore dressing processing obtains ultra-fine magnesite concentrate powder, by primary light-burned acquisition light calcined magnesia powder, using compacting
High-density sintered magnesia is made in molding and calcining.The simple many of the process, shortens the production cycle, make cost substantially under
Drop.Its processing step is as follows:
A grinding and purification ore dressing, it is using grinding machine that the magnesite is levigate to 200 mesh, i.e., 74 μm, wherein -200 mesh contain
Then amount >=75% carries out wet flotation purification ore dressing processing in flotation cell, obtains constituent MgO by weight percentage
>=47.05%, CaO/SiO2>=2 magnesite concentrate powder；
B ultrasound is finely divided and grinds, further levigate using the magnesite concentrate powder of the research of super-pine crush equipment to acquisition, obtains
The ultra-fine magnesite concentrate powder of fineness≤5 μm；
The light-burned decomposition of C, by the ultra-fine magnesite concentrate powder of acquisition in shower furnace or multihearth, by 800~1000
Heat resolve at DEG C obtains light calcined magnesia powder；
The light calcined magnesia powder of acquisition is pressed under the pressure of >=300MPa by D compression moulding using press
Type obtains the higher light-magnesite powder green body of bulk density；
The calcining of E product, the light calcined magnesia of compression moulding calcine 2 at 1800~2000 DEG C in shaft furnace or rotary kiln
~3 hours, keep the structure of minerals finer and close, obtains component MgO:97.5%~98.5%, CaO/ by weight percentage
SiO2>=2, bulk density: 3.40g/cm3~3.50g/cm3High-density sintered magnesia product.
The fineness of the ultra-fine magnesite concentrate powder of the present invention can further refine to 1 μm~4 μm；High-density sintered magnesia product
Component by weight percentage can be in MgO:98%~98.5%, CaO/SiO2>=2, bulk density can be in 3.42g/cm3~
3.50g/cm3。
Research of super-pine crush equipment of the present invention can delaminate for airflow milling, high speed machine impact grinding, agitating ball mill, grinding
Machine, sand mill, vibrator, rotary-tube type ball mill, planetary ball mill, tower mill, whirlwind autogenous tumbling mill, high pressure roller mill
The research of super-pine crush equipment such as machine, high-pressure water jet grinding machine or colloid mill.
The present invention uses magnesite for raw material, by fine grinding and a purification by floatation, then through ultra-fine grinding and grinding and
Primary light-burned, high density and high-purity magnesite clinker can be directly made in compression moulding and product calcining.Present invention process process
Very simple, cost is greatly reduced, implementation easy to spread, energy conservation and environmental protection.
Specific embodiment
Referring to exemplary embodiment, the present invention is described in detail.
Design philosophy of the invention be for technique existing in the prior art it is excessively many and diverse, magnesite raw material need by
The light-burned twice and multiple hydration process of process, and divided again by magnesium hydroxide as raw material after conversion obtains magnesium hydroxide
Solution, through it is secondary it is light-burned after obtain light calcined magnesia, then formed and calcination process prepares the defective workmanship of high-density sintered magnesia,
A kind of high-purity, the preparation method of high volume density magnesite clinker are proposed with experimental result by repeatedly improving.The present invention is outstanding
It is suitable for the preparations of low-grade magnesite.
In traditional magnesite clinker production technology, although being also provided with fine grinding process after light-burned technique, due to by
The influence of magnesia unslacked characteristic, i.e., light-burning magnesium powder viscosity is big, grading is difficult and the easy aquation of light-burning magnesium powder cannot utilize wet process
It is levigate etc., so that levigate equipment and technique is received very big limitation, grinding processes become complicated and uneconomical.More important is mills
Magnesia unslacked powder fineness after thin can only achieve 15~20 μm.And such granularity is insufficient to allow derived from MgCO3" pseudomorphic crystal " knot
Structure is destroyed, and then is difficult to obtain the high-density sintered magnesia of densification.
Inventor studies through a large number of experiments to be known, magnesite powder is ground by ultra-fine grinding, reaches its fineness
At≤5 μm, magnesium carbonate " pseudomorphic crystal " structure being previously mentioned in background technique can be made to be destroyed or partial destruction, and then make by it
It decomposes magnesia unslacked obtained and is easy densification during the sintering process.Further, since the viscosity of magnesite powder is small and can use
Wet process is levigate, can easily be connected with the wet flotation technique of previous process, thus can make ultra-fine grinding of the invention
Process becomes simpler easy, not only without dust pollution, but also economical and practical, saves water and energy.
The invention proposes a kind of high-purity, the preparation method of high volume density magnesite clinker.I.e. magnesite is former
Material is first passing through fine grinding and after a purification by floatation, and the magnesite concentrate powder obtained using upper track wet flotation technique is connect
Carry out ultra-fine grinding and grinding.I.e. by fine grinding twice, the ultra-fine magnesite concentrate powder of fineness≤5 μm is filtered out.Then it passes through again
Cross primary light-burned, high density and high-purity magnesite clinker is directly made in compression moulding and calcine technology.
Specific implementation process of the invention is that step A is levigate to 200 mesh, i.e., 74 μm by magnesite first with grinding machine；Its
In, -200 mesh contain amount≤75%；Wet flotation is carried out in magnesite investment flotation cell after levigate and purifies ore dressing, obtains component
MgO≤47.05% by weight percentage, CaO/SiO2≤ 2 magnesite concentrate powder；Step B is by above-mentioned magnesite obtained
Concentrate powder further carries out ultra-fine grinding using such as airflow milling, high speed machine impact grinding, agitating ball mill research of super-pine crush equipment
And grinding, make its fineness≤5 μm, or even carefully to 1 μm~4 μm, to obtain ultra-fine magnesite concentrate powder；Then step C utilizes outstanding
Floating furnace, multihearth, fluidized bed furnace or rotary kiln pass through heat resolve to ultra-fine magnesite concentrate powder at 800~1000 DEG C, pass through
MgCO3→MgO+CO2Chemical reaction is obtained with the higher light calcined magnesia powder of MgO purity as main component；D step is pair
Higher above-mentioned purity with MgO is that the light calcined magnesia powder of ingredient is wanted to be pressed, and is pushed using the pressure of >=300MPa
Type light calcined magnesia is made, obtains the higher green body of bulk density.Last E step by light calcined magnesia after molding in shaft furnace or
Through calcining 2~3 hours at 1800~2000 DEG C in rotary kiln, keep the institutional framework of its minerals finer and close.Due to the present invention
The fineness of ultra-fine magnesite concentrate powder can make magnesia unslacked be more easier densification during the sintering process from 1 μm to 5 μm.Product is being forged
MgO can reach 97.5%~98.5% after burning, and small product size density can reach 3.40g/cm3~3.50g/cm3, to obtain height
The high-quality magnesite clinker product of density and high-purity.
Technical process of the invention compared with traditional handicraft compared with it can be found that the present invention increased after fine grinding purification by floatation it is super
Finely divided and process of lapping makes MgCO by the granularity of flotation magnesite concentrate powder by 74 μm or so further levigate to≤5 μm3's
" pseudomorphic crystal " structure is destroyed in grinding processes, keeps the structure of matter of magnesite clinker finer and close, thus obtain high density and
The magnesite clinker of high-purity.
The present invention uses levigate wet process and Wet ultrafine grinding and grinding, generates in process of production without dust, will not be right
Environment pollutes.And the twice wet grinding linked up by wet flotation technique, also save a large amount of benefits to water
With.Present invention is especially suited for by processing low-grade magnesite to obtain the high-density sintered magnesia of high added value, greatly
Improve the cost performance of product.The present invention is set to show good Technique Popularizing value and extensive market application prospect.
The present invention by it is primary it is light-burned after can be obtained with MgO light calcined magnesia powder as main component, using
Molding and calcining obtain high-density sintered magnesia.Its technical process has reduced the number of multiple aquation, the conversion of repeatedly light-burned and raw material etc.
Process keeps technical process simple and easy, and the production cycle shortens, and production cost is greatly reduced.It is burnt with existing preparation high density
Knot magnesia technology compares, and the production cycle shortens 1/3, and production cost reduces 30%.
Research of super-pine crush equipment of the invention can for airflow milling, high speed machine impact grinding, agitating ball mill, grinding machine for cutting charge into pieces,
Sand mill, vibrator, rotary-tube type ball mill, planetary ball mill, tower mill, whirlwind autogenous tumbling mill, high-pressure roller mill, height
The equipment such as pressure water jet grinding machine or colloid mill.
Embodiment 1
Use the low-grade magnesite of domestic Dashiqiao production for raw material.Main mine substance is magnesite in its ore.Together
When also containing dolomite and a small amount of talcum, serpentine and forsterite and magnetic iron ore, bloodstone and pyrite.It is main
Chemical composition is as shown in table 1.
1 low-grade magnesite main chemical compositions of table composition
| Component | MgO | SiO2 | CaO | Fe2O3 | Al2O3 | It is other |
| % | 45.89 | 2.06 | 0.78 | 0.25 | 0.03 | 50.99 |
For low-grade magnesite raw material listed in table 1, the present embodiment first carries out fine grinding and purification ore dressing.It adopts first
With common grinding machine by levigate to 74 μm of 200 mesh, that is, granularity of magnesite raw material of fine powder, wherein -200 mesh contents are 80%.It will mill
Wet flotation is carried out in thin magnesite investment flotation cell and purifies ore dressing, obtains magnesite concentrate powder, primary chemical composition such as table 2
It is shown.
2 magnesite concentrate powder main chemical compositions of table composition
| Component | MgO | SiO2 | CaO | Fe2O3 | Al2O3 | It is other |
| % | 47.23 | 0.19 | 0.67 | 0.18 | 0.03 | 51.70 |
It can be seen that from the main chemical compositions of table 2 composition, contained by the MgO ingredient of magnesite concentrate powder after purification ore dressing processing
Amount significantly improves, and is increased to 47.23% from 45.89%.
Secondly, the magnesite concentrate powder to mentioned component content carries out ultra-fine grinding and grinding.It is stirred using research of super-pine crush equipment
Ball mill is mixed further to crush and ultra-fine magnesite concentrate powder levigate, that acquisition fineness is 4 μm levigate magnesite concentrate powder；It connects
Light-burned decomposition is carried out to ultra-fine magnesite concentrate powder, ultra-fine magnesite concentrate powder is carried out by heating point at 850 DEG C using shower furnace
Solution, the heat resolve time in shower furnace are 15 seconds, obtain light calcined magnesia powder；Exist to above-mentioned light calcined magnesia powder
Compression moulding under the pressure of 300MPa improves the densification of molding biscuit.
Finally carry out product calcining.Light calcined magnesia after compression moulding is put into shaft furnace, it is small that 3 are calcined at 1850 DEG C
When, densify the mineral formation in light calcined magnesia more, the component of the high-density sintered magnesia finally obtained is with weight
Percentage is calculated as, MgO=98.2%, CaO/SiO2=3.52, bulk density=3.42g/cm3.The present embodiment high density obtained
The component content of magnesite clinker has been more than the content definition of high-end magnesite clinker, in use with the refractory material prepared by it
Performance significantly improves.It, can be with using the refractory material service life of this high density magnesia preparation compared with general magnesite clinker
Double left and right.In addition, this high-density sintered magnesia, which can substitute fused magnesite, is widely used in basic refractory system
In product, for example, magnesia brick, magnesia carbon brick, magnesite-chrome brick, magnesia-alumina brick and magnesium zirconia block etc., can be greatly lowered the manufacture of refractory material
Cost.
Embodiment 2
The present embodiment prepares high-density sintered magnesia using the grade magnesite of embodiment 1 as raw material, by following process.
A fine grinding ore dressing.Using grinding machine that magnesite is levigate to 200 mesh, i.e., 74 μm, -200 mesh contents account for 85%；It will be levigate
Magnesite investment flotation cell in carry out ore dressing processing, obtain magnesite concentrate powder, primary chemical form with table 2.
B ultrasound is finely divided and grinds.It is further levigate to magnesite concentrate powder shown in table 2 using superfine sand mill, it obtains thin
The ultra-fine magnesite concentrate powder of 2 μm of degree.
The light-burned decomposition of C.Using rotary kiln, light-burned 60 minutes heat resolves, acquisition at 950 DEG C by ultra-fine magnesite concentrate powder
Light calcined magnesia powder.
D formed product.By the light calcined magnesia powder of light-burned acquisition, the compression moulding under the pressure of 400MPa, molding element
Base densification is improved.
E calcining.Light calcined magnesia after molding is calcined 2.5 hours at 1950 DEG C using rotary kiln, makes mineral structure
It more densifies, finally obtains high-density sintered magnesia.With weight MgO=98.2% in magnesia constituent,
CaO/SiO2=3.52, bulk density=3.48g/cm3。
Embodiment 3
The present embodiment is using the grade magnesite of embodiment 1 and embodiment 2 as raw material, and step, uses in the same way
Distinct device in research of super-pine crush equipment and light-burned equipment range, the high-density sintered magnesium of prepared different technical parameter
The process of sand.
In implementation process, using grinding machine by magnesite it is levigate to 200 mesh when, wherein -200 mesh contents are 75%, 79%,
The magnesite concentrate powder of 83% equal size, ore dressing gained content of MgO is up to 47.35%.Using airflow milling or high speed machine impact grinding
Ultra-fine grinding and grinding are carried out, obtained magnesite concentrate powder can be ground to the ultra-fine magnesite concentrate that fineness is 1 μm or 3 μm
Powder；Heat resolve is carried out to ultra-fine magnesite concentrate powder at 800 DEG C, 900 DEG C or 1000 DEG C using multihearth or fluidized bed furnace, and is obtained
Obtain light calcined magnesia powder；By light calcined magnesia powder compression moulding under the pressure of 350MPa or 450MPa, make molding biscuit
Densification be improved；Finally light calcined magnesia after molding is calcined 3 hours at 1800 DEG C using shaft furnace or rotary kiln,
Or calcined 2 hours at 2000 DEG C, keep the mineral structure of light calcined magnesia finer and close, so that obtaining content is MgO=
98.0%, CaO/SiO2=3.52, bulk density=3.45g/cm3High-density sintered magnesia；And obtaining content is MgO=
97.5%, CaO/SiO2=3.5O, bulk density=3.5Og/cm3High-density sintered magnesia.It is in specific implementation process above
In acquired different technical parameter, will no longer enumerate here.
The present invention is using magnesia brick, magnesia carbon brick, magnesite-chrome brick, magnesia-alumina brick or magnesium zirconia block made by above-specified high density magnesite clinker
Equal refractory products, the manufacturing cost than existing magnesite clinker preparation method reduces 3O%, and service life then improves one
Times or more.
The above is only the preferred embodiment of the present invention, and not limitation of the present invention.For the general of the art
For logical technical staff, various improvement can also be made without departing from the principle of the present invention, these improvement should also regard
For protection scope of the present invention.
Claims (8)
1. a kind of preparation method of high-density sintered magnesia, which is characterized in that use magnesite for raw material, by two-stage grinding and
Purification by floatation obtains ultra-fine magnesite concentrate powder, and process is light-burned, and high-density sintered magnesia is made in compacting and calcining；Its processing step is such as
Under:
A grinding and purification ore dressing, it is using grinding machine that the magnesite is levigate to 200 mesh (i.e. 74 μm), wherein -200 mesh contents >=
75%, purification ore dressing processing is then carried out, component MgO >=47.05%, CaO/SiO by weight percentage are obtained2>=2 water chestnut
Magnesium concentrate powder；
B ultrasound is finely divided and grinds, and is further crushed and levigate, is obtained using the magnesite concentrate powder of the research of super-pine crush equipment to acquisition
Obtain the ultra-fine magnesite concentrate powder of fineness≤5 μm；
Ultra-fine magnesite concentrate powder heat resolve at 800~1000 DEG C of acquisition is obtained light-burned oxidation by the light-burned decomposition of C
Magnesium powder body；
D compression moulding, using press by the light calcined magnesia powder compression moulding of acquisition under the pressure of >=300MPa；
The calcining of E product, the light calcined magnesia of compression moulding is calcined 2~3 hours at 1800~2000 DEG C, obtains component
MgO:97.5%~98.5% by weight percentage, CaO/SiO2>=2, bulk density: 3.40g/cm3~3.50g/cm3Height
Density magnesite clinker product.
2. preparation method according to claim 1, which is characterized in that the fineness of the ultra-fine magnesite concentrate powder is 1 μm~4
μm。
3. preparation method according to claim 1 or 2, which is characterized in that the component of the high-density sintered magnesia product
It is by weight percentage MgO:98%~98.5%, CaO/SiO2: >=2, bulk density: 3.42g/cm3~3.50g/cm3。
4. preparation method according to claim 1, which is characterized in that the purification ore dressing is that wet flotation purifies at ore dressing
Reason.
5. preparation method according to claim 1 or 4, which is characterized in that purification ore dressing processing in flotation cell into
Row.
6. preparation method according to claim 1, which is characterized in that airflow milling, height can be used in the research of super-pine crush equipment
Fast mechanical shock mill, agitating ball mill, grinding machine for cutting charge into pieces, sand mill, vibrator, rotary-tube type ball mill, planetary ball
Grinding machine, tower mill, whirlwind autogenous tumbling mill, high-pressure roller mill, high-pressure water jet grinding machine or colloid mill.
7. preparation method according to claim 1, which is characterized in that described light-burned shower furnace, multihearth, boiling to can be used
Furnace or rotary kiln device.
8. preparation method according to claim 1, which is characterized in that shaft furnace or rotary kiln device can be used in the calcining.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109824282A (en) * | 2019-03-18 | 2019-05-31 | 亨特利（海城）镁矿有限公司 | A kind of method that highly-purity magnesite calcining is run with high temperature vertical kiln energy-saving, environment-friendly and high-efficiency |
| CN110498621A (en) * | 2019-09-02 | 2019-11-26 | 于景坤 | A kind of preparation method of ultra-fine purification concentrate powder magnesite clinker |
| CN111072049A (en) * | 2019-12-28 | 2020-04-28 | 海城市中昊镁业有限公司 | Preparation method of high-density medium-grade sintered magnesia |
| CN111116174A (en) * | 2019-12-24 | 2020-05-08 | 辽宁科技大学 | Preparation method of high-thermal-shock high-density sintered magnesia |
| CN111925191A (en) * | 2020-07-13 | 2020-11-13 | 辽宁东和新材料股份有限公司 | Method for producing high-density high-purity sintered magnesia by using low-grade magnesite |
| CN115073811A (en) * | 2022-07-11 | 2022-09-20 | 辽宁艾海滑石有限公司 | Preparation method of talcum powder special for polypropylene nucleating agent |
| CN115974563A (en) * | 2022-12-30 | 2023-04-18 | 东北大学 | Sintered magnesia with large grains and low thermal conductivity and preparation method thereof |
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| CN109824282A (en) * | 2019-03-18 | 2019-05-31 | 亨特利（海城）镁矿有限公司 | A kind of method that highly-purity magnesite calcining is run with high temperature vertical kiln energy-saving, environment-friendly and high-efficiency |
| CN109824282B (en) * | 2019-03-18 | 2021-11-30 | 亨特利（海城）镁矿有限公司 | Energy-saving, environment-friendly and efficient operation method of high-temperature shaft kiln for calcining high-purity magnesia |
| CN110498621A (en) * | 2019-09-02 | 2019-11-26 | 于景坤 | A kind of preparation method of ultra-fine purification concentrate powder magnesite clinker |
| CN110498621B (en) * | 2019-09-02 | 2021-11-05 | 于景坤 | Preparation method of superfine purified concentrate powder sintered magnesia |
| CN111116174A (en) * | 2019-12-24 | 2020-05-08 | 辽宁科技大学 | Preparation method of high-thermal-shock high-density sintered magnesia |
| CN111072049A (en) * | 2019-12-28 | 2020-04-28 | 海城市中昊镁业有限公司 | Preparation method of high-density medium-grade sintered magnesia |
| CN111072049B (en) * | 2019-12-28 | 2022-09-27 | 海城市中昊镁业有限公司 | Preparation method of high-density medium-grade sintered magnesia |
| CN111925191A (en) * | 2020-07-13 | 2020-11-13 | 辽宁东和新材料股份有限公司 | Method for producing high-density high-purity sintered magnesia by using low-grade magnesite |
| CN115073811A (en) * | 2022-07-11 | 2022-09-20 | 辽宁艾海滑石有限公司 | Preparation method of talcum powder special for polypropylene nucleating agent |
| CN115073811B (en) * | 2022-07-11 | 2023-12-05 | 辽宁艾海滑石有限公司 | Preparation method of talcum powder special for polypropylene nucleating agent |
| CN115974563A (en) * | 2022-12-30 | 2023-04-18 | 东北大学 | Sintered magnesia with large grains and low thermal conductivity and preparation method thereof |
| CN115974563B (en) * | 2022-12-30 | 2023-10-03 | 东北大学 | Sintered magnesia with large grains and low thermal conductivity and preparation method thereof |
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