CN85102273A - The method of Magnesium Chloride Anhydrous is produced in the chlorination of magnesite pelletizing - Google Patents
The method of Magnesium Chloride Anhydrous is produced in the chlorination of magnesite pelletizing Download PDFInfo
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- CN85102273A CN85102273A CN198585102273A CN85102273A CN85102273A CN 85102273 A CN85102273 A CN 85102273A CN 198585102273 A CN198585102273 A CN 198585102273A CN 85102273 A CN85102273 A CN 85102273A CN 85102273 A CN85102273 A CN 85102273A
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- chlorination
- magnesite
- coke
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- magnesium chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
- C01F5/32—Preparation of anhydrous magnesium chloride by chlorinating magnesium compounds
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- Life Sciences & Earth Sciences (AREA)
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- Inorganic Chemistry (AREA)
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Abstract
The present invention is applicable to the industrial Magnesium Chloride Anhydrous that magnesite production fused salt electrolysis refining magnesium is used.Present method comprises feedstock production, balling-up, oven dry and four operations of chlorination.750～800 ℃ of the calcining temperatures of feedstock production calcination process, light-calcined magnesite are equipped with coke, salt and 500～580 ℃ of oven dry down of bittern balling-up, chlorination under 950～1100 ℃ of temperature.Adopt the magnesium chloride output of the vertical chlorination furnace of present method pelletizing chlorination can the raising significantly.
Description
The present invention is applicable to the industrial Magnesium Chloride Anhydrous that magnesite production fused salt electrolysis refining magnesium is used, its content of magnesium chloride＞92%.Adopt present method can increase substantially the magnesium chloride output of vertical electric chlorinator, also be applicable to the activated magnesia chlorination production Magnesium Chloride Anhydrous that other method is produced.
With magnesite is raw material, adopts vertical electric chlorinator to produce Magnesium Chloride Anhydrous, domestic cement furnace charge, the group's of doing furnace charge, the using magnesite granule furnace charge once used.
The cement furnace charge is formulated by magnesite breeze, magnesia, refinery coke, wood chip and bittern, be group by generating magnesium cement between magnesium oxide and the magnesium chloride solution, owing to contain a large amount of water, chlorine utilization is low during chlorination, agglomerate dewaters easily cracked in chlorination furnace, causes the fritting in the stove operational difficulty easily.Because the raw material activity is low, the output of chlorination furnace is not high, and general output is 7.1 ton per day platform melt magnesium chlorides.
Do group's furnace charge and be by magnesite breeze, magnesia, refinery coke, salt, pitch formulated.Make binding agent with pitch, warp mixes and pinches, agglomerate is made by the group of pressure, advances the chlorination furnace chlorination.Agglomerate hot strength in stove is low, and easy soft stand causes stove to hinder power to increase.Adopt the thin bed of material, low chlorine gas concentration, the low flow operation, shortage of heat is allocated causticity magnesite and superfluous carbon element additional heat in the batching.Because of agglomerate without coking, chlorination furnace a large amount of glance coal of emerging, operational condition is poor, exhaust pipe and washing plant accumulate a large amount of volatile matters, stop up serious, the cleaning difficulty, the output of magnesium chloride and quality all have fluctuation, general output is 7.6 ton per day platforms.
The using magnesite granule furnace charge has saved the briquetting operation, has eradicated the pitch damage by fume.But because the difference in specific gravity of magnesite and coke is big, incomplete mixing, carbon content is difficult to control, and the material inequality falls in the interior normal cavity that occurs of stove, and local fault is many.For increasing thermal value, allocate excessive carbon into, and reduce chlorine gas concentration, cause damage of furnace lining serious.Be generally 8.3 ton per day platforms with this furnace charge output, also not high.
Abroad, Norway NH company adopts seawater rhombspar synthetic magnesium oxide, allocates low temperature coal tar and bittern system ball into, pelletizing drying post chlorization production Magnesium Chloride Anhydrous melt, but be that raw material is not reported with magnesite.
This method is to become preferably light calcined magnesia of activity with the magnesite calcination, and technology is simple, and cost is low.
Present method is produced Magnesium Chloride Anhydrous and is comprised feedstock production, balling-up, oven dry and four master operations of chlorination, its technical process is as follows: magnesite light-burned burning till in rotary kiln that will be crushed to certain particle size has better active light calcined magnesia, and pulverize, be mixed with coke and the salt ratio of components in accordance with regulations pulverized.The activity of light-calcined magnesite and granularity, the grain size proportion of coke and activity are the important factors that influences the chlorination effect.The powder of mixing is called green-ball after the groupization on the dish apparatus for making pearl ball of garden and by the saturated bittern rolling balling-up that enriched bittern cake and synthetic bittern are made.Green-ball is made ripe ball in the dehydration of rotary kiln inner drying.Should note guaranteeing the intensity of ripe ball.Ripe ball is logical chlorinated with chlorine in the vertical electric chlorinator that plain resistive element is a heating element with charcoal, and chlorination furnace is two row's electrode power supplies normally, to guarantee chlorination temperature.Requirement has chlorine flowrate and flow velocity stably, and chlorine gas concentration can be chosen in 70～100% scopes, divides usually in the stove and gives thermosphere, responding layer and slag blanket.Should note controlling exhaust temperature, be advisable so that dewfall not to take place.Main technical points is as follows:
1, raw material activity and controlling index
Light-calcined magnesite: 750～800 ℃ of calcination temperatures, calcination time and ore grain size, material amount are relevant.Contain MgO＞90%, hydration activity＞34%, levigate to-100 orders.
Jiao or brown coal Jiao after refinery coke, delay coke, the forging, carbon containing 85～97%.Granularity 0.25～1 millimeter＞80% ,-0.25 millimeter＜20%.
Bittern: dissolve clarification, near the saturated bittern of room temperature, content of magnesium chloride 380～450 grams per liters, 30～75 ℃ of use temperatures.
2, batching and system ball
Contain carbon ratio Mc=0.2～0.3, liquid/solid=0.4～0.6, ratio of components is a light-calcined magnesite powder 45.61～57.93%, coke 14.49～10.75, salt 2.40～2.75%, bittern 37.50～28.57%, also can be without salt, apparatus for making pearl ball maximum line velocity 0.8～1.5 meter per second.8～16 millimeters of pelletizing diameters.
3, pelletizing oven dry
500～580 ℃ of rotary kiln hot-wind inlet temperature, 300～370 ℃ of drying temperatures, 35～70 minutes time of drying, dry bulb moisture 6～15%.1.5 meters freely falling bodies 90% of dry bulb intensity are not broken.
4, pelletizing chlorination
950～1100 ℃ of chlorination reaction layer temperature, chlorine gas concentration 70～100%, magnesium oxide chlorination rate＞95%.
Adopt the chlorination of present method pelletizing, chlorination reaction velocity is fast, and the pelletizing hot strength is good, and chlorination process is molten not to loose, and material can fall in good permeability automatically, and the tail gas amount is few and processing is easy.Compare with the chlorination of using magnesite granule material, light-burned pelletizing can improve chlorination furnace production capacity 73%; Compare with a dried furnace charge, can improve chlorination furnace production capacity 88.5%; Compare with the cement furnace charge, can improve chlorination furnace production capacity 102%.
Example:
The magnesite that contains MgO46.77%, 7～30 millimeters of granularities, under 800 ℃ of temperature light-burned 1 hour, can make and contain MgO92.13%, the light calcined magnesia of hydration activity 34.8% is milled to-100 orders, delay coke is crushed to 0.25～1 millimeter and accounts for below 80%, 0.25 millimeter and account for 20%.Combination grain delay coke chemistry consists of: fixed carbon 87.82%, volatile matter 10.52%, ash content 0.88%.Edible refined salt granularity＜1 millimeter, NaCl＞97%.Press light-calcined magnesite 48.86%, delay coke 14.81%, salt 2.54%, bittern 33.95% batching system ball.Consisting of of green pellets: MgCl
210.17%, CaCl
20.98%, CaO 0.14%, and NaCl 3%, and MgO 45.16%, and C 13.50%, rotary kiln drying, and 520～540 ℃ of inlet temperature, 340～350 ℃ of drying temperatures, 43 minutes time, the chemical constitution of gained hot-bulb group is MgCl
211.33%, CaCl
21.22%, MgO 56.86%, and CaO 0.46%, and NaCl 3.94%, and C 18.38%, H
2O 7.95%.Ball intensity 100% is not broken.Chlorination temperature is 950～1100 ℃ in vertical electric chlorinator, chlorine gas concentration 85%, and the chemical constitution of the Magnesium Chloride Anhydrous melt that makes is MgCl
292.66%, CaCl
22.23%, MgO 0.1%, and NaCl 2.96%.Present method is applicable to the vertical electric chlorinator of different size.
Claims (7)
1, a kind of method of producing Magnesium Chloride Anhydrous with magnesite for the raw material chlorination, it is characterized in that with the slight calcination of magnesite light-calcined magnesite after the calcination and coke, salt, bittern are prepared burden by a certain percentage and is rolled onto the cement pelletizing, after curing and oven dry, put into chlorination furnace and carry out chlorination again.
2, in accordance with the method for claim 1, it is characterized in that 750～800 ℃ of the temperature of magnesite calcination, hydration activity＞34%, levigate to-100 orders.
3, in accordance with the method for claim 1, the granularity 0.25～1 millimeter 〉=80%, 0.25 millimeter≤20% that it is characterized in that coke.It can be Jiao or brown coal Jiao after refinery coke, delay coke, the forging.
4, in accordance with the method for claim 1, it is characterized in that bittern concentration 380～450 grams per liters, 30～75 ℃ of use temperatures.
5, in accordance with the method for claim 1, it is characterized in that containing carbon ratio 0.2～0.3, liquid/solid=0.4～0.6.Ratio of components: light-calcined magnesite powder 45.61～57.93% coke 14.79～10.75%, salt 2.40～2.75%; Bittern 37.50～28.57%.
6, in accordance with the method for claim 1, it is characterized in that enter the mouth 500～580 ℃ of whole Wen Wendu of drying kiln, 300～370 ℃ of drying temperatures, 35～70 minutes time of drying.
7, in accordance with the method for claim 1, it is characterized in that 950～1100 ℃ of chlorination reaction layer temperature, chlorine gas concentration 70～100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585102273A CN85102273A (en) | 1985-04-01 | 1985-04-01 | The method of Magnesium Chloride Anhydrous is produced in the chlorination of magnesite pelletizing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585102273A CN85102273A (en) | 1985-04-01 | 1985-04-01 | The method of Magnesium Chloride Anhydrous is produced in the chlorination of magnesite pelletizing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85102273A true CN85102273A (en) | 1986-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198585102273A Pending CN85102273A (en) | 1985-04-01 | 1985-04-01 | The method of Magnesium Chloride Anhydrous is produced in the chlorination of magnesite pelletizing |
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|---|---|
| CN (1) | CN85102273A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400686C (en) * | 2006-05-18 | 2008-07-09 | 赖成章 | Magnesium-refined smelting method by resistance furnace |
| CN102534196A (en) * | 2010-12-14 | 2012-07-04 | 贵阳铝镁设计研究院有限公司 | Chlorination process for pressing magnesite into balls through light burning dry method |
-
1985
- 1985-04-01 CN CN198585102273A patent/CN85102273A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400686C (en) * | 2006-05-18 | 2008-07-09 | 赖成章 | Magnesium-refined smelting method by resistance furnace |
| CN102534196A (en) * | 2010-12-14 | 2012-07-04 | 贵阳铝镁设计研究院有限公司 | Chlorination process for pressing magnesite into balls through light burning dry method |
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