CN107010852A - A kind of light calcined magnesia production method - Google Patents
A kind of light calcined magnesia production method Download PDFInfo
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- CN107010852A CN107010852A CN201710260723.9A CN201710260723A CN107010852A CN 107010852 A CN107010852 A CN 107010852A CN 201710260723 A CN201710260723 A CN 201710260723A CN 107010852 A CN107010852 A CN 107010852A
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- China
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- magnesite
- light
- calcined magnesia
- microwave
- silicon carbide
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
The present invention relates to metallurgical technology field, more particularly to a kind of light calcined magnesia production method.Using the magnesite less than 30mm granularities as raw material, it is passed in rotary microwave roaster and is mixed with re-crystallized silicon carbide ball；Light calcined magnesia is produced by the use of re-crystallized silicon carbide ball as microwave coupling agent indirectly heat magnesite, magnesite is coupled agent re-crystallized silicon carbide ball grinding into high activity light-magnesite powder while light calcined magnesia is calcination into, while high efficiency, low cost, which recycles magnesium carbonate, decomposes the high concentration CO produced2Gas.Existing technique is seted to be effectively utilized from the resource processed；Magnesite while light calcined magnesia is calcination into by grinding into high activity light-magnesite powder, add the activity of product, improve the quality of product, eliminate crushing link, simplify flow, production process is easily controllable；Using the method for on-fuel combustion heating calcined magnesite, CO is realized2High efficiency, low cost is reclaimed, and alleviates environmental pollution.
Description
Technical field
The present invention relates to metallurgical technology field, more particularly to a kind of light calcined magnesia production method.
Background technology
Magnesite is one of Dominant Mineral Resources of China, and more than 30 hundred million tons of gross reserves accounts for four points of world's magnesite ore reserves
One of, occupy first of the world.The light-magnesite powder that magnesite is sintered into is metallurgy, refractory material, building materials, chemical industry, papermaking, rubber
The indispensable raw mineral materials in the fields such as glue, plastics, coating, medicine, chemical fertilizer, development and application are quickly grown and increasingly extensive.
Current China is produced active light calcined magnesia by magnesite and typically calcined using reflecting kiln, and production technology existing 70~
80 years history.Giobertite is added by reflecting kiln kiln top, is heated to 1000 DEG C of decomposition through Semi-gas burning mode in kiln, is decomposed
Material enters kiln bottom feed bin afterwards, and manually splicing dolly shifts 400~800 DEG C of high-temperature materials onto stock ground to topple over ground naturally cold
But block light calcined magnesia, then through artificial heat choosing is obtained, light-magnesite powder is obtained after being ground through milling equipment.Reflecting kiln can only
Lump ore (50~300mm) raw material is calcined, and is simply equipped, backward in technique, low production efficiency, high energy consumption, Product Activity is low, matter
Poor, serious waste of resources is measured, labor operation condition is poor, and dust pollution is serious.
The main component of magnesite is magnesium carbonate (MgCO3), theory composition is MgO47.81%, CO252.19%, in water chestnut
In the calcination process of magnesium ore deposit, MgCO3Decompose the CO for producing about 5l% or so2Gas.By calculating, 1 ton of light-burned oxidation is produced
Magnesium powder, need to averagely use 2.3 tons of one-level magnesite ore, consume 0.3 ton of standard coal.Decomposed by magnesite per ton and produce 0.51 ton
CO23.4 tons of CO of C burnings generation in gas, coal per ton2Gas is calculated, and is often produced 1 ton of light-magnesite powder, will be generated 2.19 tons
CO2Gas.China's light calcined magnesia annual capacity will produce nearly 22,000,000 tons of CO more than 10,000,000 tons, every year2, these CO2With it is anti-
Penetrate the flue gas that fuel combustion is generated in kiln to mix, its concentration is very low, typically 10%~20%, it is difficult to Collection utilization,
These mixed gas are discharged into air, cause serious environmental pollution.Some magnesite processing enterprises of China taste in recent years
CO is reclaimed in the waste gas that examination is discharged from magnesite calcination process2, increase during magnesite production light calcined magnesia and reclaim
Device, by the CO of outer row2Gas is reclaimed.However, due to reflecting kiln list kiln small scale, exhaust gas flow is extremely unstable, and waste gas is difficult
Collect, especially exhausted air quantity is big, wherein CO2The concentration of gas is low, causes CO2Reclaimer investment is big, and operating cost is too high, raw
Production enterprise is difficult to receive.The trial of these enterprises fails and come to an end, causes very big economic loss.
The content of the invention
The present invention provides a kind of light calcined magnesia production method, using the magnesite of 0~30mm granularities as raw material, using tying again
Crystalline substance carbonization silicon ball produces light calcined magnesia as microwave coupling agent indirectly heat magnesite, and magnesite is calcination into light-burned oxidation
Agent re-crystallized silicon carbide ball grinding is coupled while magnesium into high activity light-magnesite powder, the activity of product is improved, saves
Crushing link, simplifies technological process so that magnesium carbonate decomposes the high concentration CO produced2Gas is able to high efficiency, low cost and returned
Receive and utilize.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of light calcined magnesia production method, microwave coupling agent indirectly heat magnesite is used as by the use of re-crystallized silicon carbide ball
Produce light calcined magnesia, magnesite be coupled while light calcined magnesia is calcination into agent re-crystallized silicon carbide ball grinding into
High activity light-magnesite powder, while high efficiency, low cost, which recycles magnesium carbonate, decomposes the high concentration CO 2 gas produced, specific bag
Include following steps：
(1) the magnesite feedstock transportation of 0~30mm granularities is placed into rotary microwave roaster with being calcined in furnace chamber
Particle diameter uniformly mixed for 1~120mm re-crystallized silicon carbide ball；Magnesite weight/mass percentage composition is 10%~80%, then is tied
Crystalline substance carbonization silicon ball weight/mass percentage composition is 20%~90%.
(2) rotary microwave roaster uses the microwave that frequency produces for 900~3000MHZ industrial microwaves source as heat
Source, re-crystallized silicon carbide ball is warming up to 650~1000 DEG C as microwave coupling agent and microwave efficient coupling in 1~20min；
(3) in the presence of couplant, it is light that magnesite, which is indirectly heated to 600~950 DEG C and carries out decomposition reaction calcining,
Burned magnesium oxide, while generating the CO that concentration is 90%~98%2。
(4) in calcination process, with the rotation of roaster, fall after the elevated 50~1500mm of re-crystallized silicon carbide ball
Under, material is impacted and ground, magnesite while light calcined magnesia is calcination into by grinding into granularity be 0~
1mm high activity light-magnesite powder.
(5) magnesite is decomposed to the CO that the concentration produced is 90%~98%2Reclaimed by retracting device.
Compared with prior art, the beneficial effects of the invention are as follows：
1), as raw material, to prevent existing technique to be effectively utilized from the resource processed less than 30mm mucks；
2) magnesite while light calcined magnesia is calcination into by grinding into high activity light-magnesite powder, add
The activity of product, improves the quality of product, eliminates crushing link, simplifies flow so that production process is easily controllable；
3) using the method for on-fuel combustion heating calcined magnesite, flue gas, magnesite calcining are produced without fuel combustion
Decompose and produce high concentration CO2, realize CO2High efficiency, low cost is reclaimed, and alleviates environmental pollution.
Embodiment
The embodiment to the present invention is described further below：
A kind of light calcined magnesia production method, microwave coupling agent indirectly heat magnesite is used as by the use of re-crystallized silicon carbide ball
Produce light calcined magnesia, magnesite be coupled while light calcined magnesia is calcination into agent re-crystallized silicon carbide ball grinding into
High activity light-magnesite powder, while high efficiency, low cost, which recycles magnesium carbonate, decomposes the high concentration CO produced2Gas, specific bag
Include following steps：
(1) the magnesite feedstock transportation of 0~30mm granularities is placed into rotary microwave roaster with being calcined in furnace chamber
Particle diameter uniformly mixed for 1~120mm re-crystallized silicon carbide ball；Magnesite weight/mass percentage composition is 10%~80%, then is tied
Crystalline substance carbonization silicon ball weight/mass percentage composition is 20%~90%.
The present invention less than the broken magnesite of 30mm, as raw material, to prevent existing technique to be effectively utilized from the resource processed.
(2) rotary microwave roaster uses the microwave that frequency produces for 900~3000MHZ industrial microwaves source as heat
Source, re-crystallized silicon carbide ball is warming up to 650~1000 DEG C as microwave coupling agent and microwave efficient coupling in 1~20min.
Microwave heating is a kind of brand-new heat energy technology, and its heating does not need external heat source, is to utilize microwave and material
Interaction, microwave energy is directly heated for the heat energy of material to material.Compared with conventional art, microwave technology also has
Following advantage：1. the instantaneity heated, microwave equipment plug and play, without preheating is easy to control without waste heat, flexible and convenient operation.
2. the globality heated, microwave is a kind of strong electromagnetic wave of penetration power, when handling material, and each position of material is simultaneously uniform
Heating, thermograde is small, is a kind of " body heat source ".3. the selectivity heated, it is possible to use the selectivity of microwave heating is to mixing
The different parts of each component or part in material carry out selective heating.4. the high efficiency of energy utilization, extra energy is damaged
Consumption is small, and the thermal efficiency is high.5. there is controllability, the degree for microwave heated material can be entered by adjusting microwave irradiation time
Row control, easily operation.
(3) in the presence of couplant, it is light that magnesite, which is indirectly heated to 600~950 DEG C and carries out decomposition reaction calcining,
Burned magnesium oxide, while generating the CO that concentration is 90%~98%2。
(4) in calcination process, with the rotation of roaster, fall after the elevated 50~1500mm of re-crystallized silicon carbide ball
Under, material is impacted and ground, magnesite while light calcined magnesia is calcination into by grinding into granularity be 0~
1mm high activity light-magnesite powder.
Magnesite while light calcined magnesia is calcination into by grinding into high activity light-magnesite powder, add production
The activity of product, improves the quality of product, eliminates crushing link, simplifies flow so that production process is easily controllable.
(5) magnesite is decomposed to the CO that the concentration produced is 90%~98%2Reclaimed by retracting device.CO after recovery2
It can be made into the technical grade liquid or solid CO that purity is 99.5%2(dry ice) or purity are 99.9% food-class CO2。
Using the method for on-fuel combustion heating calcined magnesite, flue gas, magnesite calcining point are produced without fuel combustion
Solution produces high concentration CO2, high efficiency, low cost can be achieved and reclaims, environmental pollution is alleviated.
Embodiment 1：
(1) the magnesite feedstock transportation of 0~30mm granularities is placed into rotary microwave roaster with being calcined in furnace chamber
Particle diameter uniformly mixed for 20~50mm re-crystallized silicon carbide ball；Magnesite weight/mass percentage composition is 30%, recrystallization carbonization
Silicon ball weight/mass percentage composition is 70%.
(2) rotary microwave roaster uses the microwave that frequency produces for 915MHZ industrial microwaves source as thermal source, then ties
Crystalline substance carbonization silicon ball is warming up to 750 DEG C as microwave coupling agent and microwave efficient coupling in 10min.
(3) in the presence of couplant, it is light-burned oxidation that magnesite, which is indirectly heated to 700 DEG C and carries out decomposition reaction calcining,
Magnesium, while generating the CO that concentration is 90%~98%2。
(4) in calcination process, with the rotation of roaster, fallen after the elevated 150mm of re-crystallized silicon carbide ball, to thing
Material is impacted and ground, magnesite while light calcined magnesia is calcination into by grinding into granularity for 0~0.088mm
High activity light-magnesite powder.
(5) magnesite is decomposed to the CO that the concentration produced is 90%~98%2Reclaimed by retracting device.
Embodiment 2：
(1) the magnesite feedstock transportation of 0~30mm granularities is placed into rotary microwave roaster with being calcined in furnace chamber
Particle diameter uniformly mixed for 30~80mm re-crystallized silicon carbide ball；Magnesite weight/mass percentage composition is 35%, recrystallization carbonization
Silicon ball weight/mass percentage composition is 65%.
(2) rotary microwave roaster uses the microwave that frequency produces for 2450MHZ industrial microwaves source as thermal source.Tie again
Crystalline substance carbonization silicon ball is warming up to 900 DEG C as microwave coupling agent and microwave efficient coupling in 15min.
(3) in the presence of couplant, it is light-burned oxidation that magnesite, which is indirectly heated to 850 DEG C and carries out decomposition reaction calcining,
Magnesium, while generating the CO that concentration is 90%~98%2。
(4) in calcination process, with the rotation of roaster, fallen after the elevated 300mm of re-crystallized silicon carbide ball, to thing
Material impacted and ground, magnesite while light calcined magnesia is calcination into by grinding into granularity be 0~0.5mm height
Active light-magnesite powder.
(5) magnesite is decomposed to the CO that the concentration produced is 90%~98%2Reclaimed by retracting device.
Embodiment 3：
(1) the magnesite feedstock transportation of 0~30mm granularities is placed into rotary microwave roaster with being calcined in furnace chamber
Particle diameter uniformly mixed for 40~100mm re-crystallized silicon carbide ball；Magnesite weight/mass percentage composition is 40%, recrystallization carbonization
Silicon ball weight/mass percentage composition is 60%.
(2) rotary microwave roaster uses the microwave that frequency produces for 915MHZ industrial microwaves source as thermal source.Tie again
Crystalline substance carbonization silicon ball is warming up to 950 DEG C as microwave coupling agent and microwave efficient coupling in 18min.
(3) in the presence of couplant, it is light-burned oxidation that magnesite, which is indirectly heated to 900 DEG C and carries out decomposition reaction calcining,
Magnesium, while generating the CO that concentration is 90%~95%2。
(4) in calcination process, with the rotation of roaster, fallen after the elevated 500mm of re-crystallized silicon carbide ball, to thing
Material is impacted and ground, and magnesite is living for 0~1mm height into granularity by grinding while light calcined magnesia is calcination into
Property light-magnesite powder.
(5) magnesite is decomposed to the CO that the concentration produced is 90%~98%2Reclaimed by retracting device.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (3)
1. a kind of light calcined magnesia production method, it is characterised in that indirect by the use of re-crystallized silicon carbide ball as microwave coupling agent
Magnesite production light calcined magnesia is heated, magnesite is coupled agent recrystallization carbonization while light calcined magnesia is calcination into
Silicon ball grinding is into high activity light-magnesite powder, while high efficiency, low cost, which recycles magnesium carbonate, decomposes the high concentration CO produced2
Gas, specifically includes following steps：
(1) the magnesite feedstock transportation of 0~30mm granularities is placed again into rotary microwave roaster with being calcined in furnace chamber
Crystalline silicon carbide silicon ball is uniformly mixed；
(2) rotary microwave roaster uses the microwave that frequency produces for 900~3000MHZ industrial microwaves source as thermal source, then
Crystalline silicon carbide silicon ball is warming up to 650~1000 DEG C as microwave coupling agent and microwave efficient coupling in 1~20min；
(3) in the presence of couplant, it is light-burned oxygen that magnesite, which is indirectly heated to 600~950 DEG C and carries out decomposition reaction calcining,
Change magnesium, while generating the CO that concentration is 90%~98%2；
(4) in calcination process, with the rotation of roaster, fallen after the elevated 50~1500mm of re-crystallized silicon carbide ball, it is right
Material is impacted and ground, magnesite while light calcined magnesia is calcination into by grinding into granularity be 0~1mm height
Active light-magnesite powder；
(5) magnesite is decomposed to the CO that the concentration produced is 90%~98%2Reclaimed by retracting device.
2. a kind of light calcined magnesia production method according to claim 1, it is characterised in that step (1) magnesite
Weight/mass percentage composition is 10%~80%, and re-crystallized silicon carbide ball weight/mass percentage composition is 20%~90%.
3. a kind of light calcined magnesia production method according to claim 1, it is characterised in that step (1) recrystallization
The particle diameter for the silicon ball that is carbonized is 1~120mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108249786A (en) * | 2018-01-23 | 2018-07-06 | 辽宁瀚海工业机电设备有限公司 | Utilize microwave heating magnesite continuous production activated magnesia and the method for recycling carbon dioxide |
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| CN1884170A (en) * | 2006-06-28 | 2006-12-27 | 满意 | Method for sintering and soft burning magnesia in tunnel kiln by using magnesite powder and particles |
| CN102020250A (en) * | 2009-09-18 | 2011-04-20 | 昆明理工大学 | New method for producing sulphuric acid and generation joint product cement by decomposing phosphogypsum through microwave reduction |
| CN102230223A (en) * | 2011-06-16 | 2011-11-02 | 申偲伯 | Method for preparing magnesium potassium titanate by directly utilizing magnesium oxide |
| CN104071993A (en) * | 2014-06-26 | 2014-10-01 | 郑州德朗能微波技术有限公司 | Magnesite/dolomite microwave light-burning device and method |
| CN203923022U (en) * | 2014-06-26 | 2014-11-05 | 郑州德朗能微波技术有限公司 | The device of a kind of microwave light-calcined magnesite, rhombspar |
| CN106186737A (en) * | 2016-07-12 | 2016-12-07 | 海城市恒镁科技有限公司 | A kind of method of the eco-friendly light-burned good quality magnesium oxide of magnesite concentrate |
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2017
- 2017-04-20 CN CN201710260723.9A patent/CN107010852B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884170A (en) * | 2006-06-28 | 2006-12-27 | 满意 | Method for sintering and soft burning magnesia in tunnel kiln by using magnesite powder and particles |
| CN102020250A (en) * | 2009-09-18 | 2011-04-20 | 昆明理工大学 | New method for producing sulphuric acid and generation joint product cement by decomposing phosphogypsum through microwave reduction |
| CN102230223A (en) * | 2011-06-16 | 2011-11-02 | 申偲伯 | Method for preparing magnesium potassium titanate by directly utilizing magnesium oxide |
| CN104071993A (en) * | 2014-06-26 | 2014-10-01 | 郑州德朗能微波技术有限公司 | Magnesite/dolomite microwave light-burning device and method |
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| CN106186737A (en) * | 2016-07-12 | 2016-12-07 | 海城市恒镁科技有限公司 | A kind of method of the eco-friendly light-burned good quality magnesium oxide of magnesite concentrate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108249786A (en) * | 2018-01-23 | 2018-07-06 | 辽宁瀚海工业机电设备有限公司 | Utilize microwave heating magnesite continuous production activated magnesia and the method for recycling carbon dioxide |
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