CN108314335A - A kind of light-burned MgO suspension kilns coproduction Mg (OH)2Production technology and device - Google Patents
A kind of light-burned MgO suspension kilns coproduction Mg (OH)2Production technology and device Download PDFInfo
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- CN108314335A CN108314335A CN201810346750.2A CN201810346750A CN108314335A CN 108314335 A CN108314335 A CN 108314335A CN 201810346750 A CN201810346750 A CN 201810346750A CN 108314335 A CN108314335 A CN 108314335A
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- 239000000725 suspension Substances 0.000 title claims abstract description 22
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 129
- 239000011777 magnesium Substances 0.000 claims abstract description 76
- 238000006703 hydration reaction Methods 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 239000012716 precipitator Substances 0.000 claims abstract description 31
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 26
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 26
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 25
- 238000005243 fluidization Methods 0.000 claims abstract description 22
- 239000012153 distilled water Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims description 33
- 238000001354 calcination Methods 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 239000000498 cooling water Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 11
- 230000036571 hydration Effects 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 5
- 108010066057 cabin-1 Proteins 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 213
- 230000008569 process Effects 0.000 abstract description 13
- 238000005245 sintering Methods 0.000 abstract 2
- 238000009434 installation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 34
- 235000014380 magnesium carbonate Nutrition 0.000 description 22
- 239000000463 material Substances 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 8
- 239000000347 magnesium hydroxide Substances 0.000 description 6
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 6
- 238000010304 firing Methods 0.000 description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000003287 bathing Methods 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 235000012054 meals Nutrition 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000010189 synthetic method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000007926 Craterellus fallax Nutrition 0.000 description 1
- 240000007175 Datura inoxia Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- LWNCNSOPVUCKJL-UHFFFAOYSA-N [Mg].[P] Chemical compound [Mg].[P] LWNCNSOPVUCKJL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000019580 granularity Nutrition 0.000 description 1
- 235000021552 granulated sugar Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C01F5/14—Magnesium hydroxide
- C01F5/16—Magnesium hydroxide by treating magnesia, e.g. calcined dolomite, with water or solutions of salts not containing magnesium
-
- 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
- C04B2/106—Preheating, burning calcining or cooling in fluidised bed furnaces
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The present invention discloses a kind of light-burned MgO suspension kilns coproduction Mg (OH)2Production technology and device, dust-precipitator, finished bin etc. are collected including raw material cabin, Category Four cyclone preheater, dore furnace, cyclone separator, cooling bed, the hydration reaction tower of fluidisation, finished product, MgO clinkers are obtained after magnesium carbonate powder sintering, after gas solid separation, light-burned MgO finished products are can be prepared by after fluidizing cooling bed cooling by the feeding of switching gate, or by can be prepared by Mg (OH) after switching gate feeding hydration reaction tower and distilled water hydration reaction2Finished product.The present invention changes the single feature of existing light calcined magnesia roasting apparatus product, changes the technological process of high temperature sintering MgO by the switching gate of the device, in the case where not increasing manufacturing facilities, it can be achieved that producing coproduction Mg (OH) while light-burned MgO2Purpose, effectively increase utilization rate of equipment and installations, saved the energy, reduce production cost.
Description
Technical field
The present invention relates to a kind of light-burned MgO coproduction Mg (OH)2Production system, more particularly to it is a kind of using suspension kiln calcine
Magnesite produces light-burned MgO co-productions Mg (OH)2Production technology and device
Background technology
MgO is a kind of important inorganic chemical product, be widely used in chemical industry, light industry, food, medicine, coating, rubber,
The industries such as electronics, metallurgy, building materials are widely used, are various in style, can be divided into two major classes by processing method：Calcine MgO and synthesis
MgO.Calcine MgO generally using magnesite be raw material certain equipment and at a temperature of it is obtained through calcining, China's magnesite resource compared with
Horn of plenty, calcining MgO equipment investments are low, economical quick so that calcining MgO becomes the main processing method of China's MgO material.
Magnesite (MgCO3) theoretical decomposition temperature be 560 DEG C, temperature be less than 560 DEG C when, magnesite cannot decompose, and cause raw burn, temperature
When degree is higher than 560 DEG C, magnesite starts to decompose, and the MgO granularities of generation are small, and activity is high, with the raising of calcination temperature, MgO knots
Brilliant fine and close, activity becomes smaller.The roasting of light-burned MgO is a kind of chemical reaction process, MgCO3It is thermally decomposed into MgO and CO2, burning and
Underburnt can all lead to the reduction of MgO activity, or even lose activity.Activity and the calcination temperature of MgO has direct relation, in order to improve
The activity of MgO, the method for general multi-purpose low temperature calcination.
The industrialized production overwhelming majority of current light-burned MgO uses kiln process.Shaft kiln production Technology equipment falls behind,
Calcination temperature is higher (about 1200 DEG C~1300 DEG C), and tiling stacking is layered with bulk material (100mm~300mm) magnesite raw material
Mode calcined in kiln, gas-solid reaction contact area is small, and calcination time is long, raw outer burnt in product, and surface calcining is excessively easily made
At material " dead roasting ", inside calcining, which is not thorough, leads to material " underburnt ", it is difficult to produce high activity MgO, production process is by operative employee
People is observed in flame-observing hole, breaks up, screens discharging, and the degree of automation is low, and in exhaust gas dust emission concentration it is high (>
500mg/Nm3), it is a kind of very backward MgO production methods.In order to improve light-burned MgO product qualities, many enterprises attempt to use
Calcined by rotary kiln produces light-burned MgO, but there is also some shortcomingss for this calcined by rotary kiln production technology, have especially been the absence of
The preheating step of effect, heat recovery rate is low, and firing heat consumption when calcined by rotary kiln being caused to prepare light-burned MgO is high, it is difficult to aobvious
Writing reduces the production cost of light-burned MgO.Under the premise of ensureing product quality, in order to reduce light-burned MgO production costs, Hen Duoke
Skilled worker author attempts to produce light-burned MgO using suspension kiln calcining.The Chinese patent literature of publication number CN106007416A discloses
A kind of light calcined magnesia roasting kiln suspension roasting device, uses fine powder magnesite for raw material, and material is outstanding with ramping up with hot gas
The mode of floating calcining prepares light calcined magnesia.Such an approach increases gas-solid reaction contacts area, improve heat exchanger effectiveness, but
Lack high temperature powder cooling system and waste heat from tail gas recycling system, not can significantly reduce the firing heat of light calcined magnesia
Consumption.
Mg(OH)2It is a kind of important magnesium chemical products, can be used as fire retardant for plastics, rubber product industry, have
Fire-retardant, suppression cigarette, filling triple functions, also can be used as oil dope, play the role of anti-corrosion and desulfurization, also can be used for manufacturing magnesium
Salt, activated magnesia, drug, fine ceramics, thermal insulation material, granulated sugar is refined, flue gas desulfurization agent, acid-bearing wastewater neutralizer, coloured silk
Electric picture tube cone glass coating etc..Mg(OH)2Synthetic method mainly have brine lime method, brine Ammonia Process, concentrated seawater extraction
Method and aqua oxidation magnesium processes etc..Traditional Mg (OH)2Synthetic method needs a large amount of water that dry material is melted into flowable slurry,
Then through a long time digests, and finally passes through and the obtained Mg (OH) of multiple tracks technique such as is dehydrated, dries, breaing up2Product, this method exist
The shortcomings of complex process, water consumption be big, high energy consumption.
The Chinese patent literature of publication number CN106044806A discloses a kind of side preparing magnesium hydroxide using magnesite
Method and thus be made magnesium hydroxide, use external-burning calcined by rotary kiln magnesite to obtain light-burned MgO, then by slurrying,
The processes such as filtering, dry, screening prepare magnesium hydroxide.The patent prepares the waste heat of light-burned MgO processes using rotary kiln, and
It is to use the light-burned MgO slurrying aquation being cooled to room temperature, then reheats dry method and prepare Mg (OH)2Product equally exists
The shortcomings of complex process, water consumption be big, high energy consumption.The Chinese patent literature of publication number CN103864122A discloses a kind of with high
The method that magnesium phosphorus tailing prepares magnesium hydroxide calcines High-Mg phosphate tailings at 850 DEG C~1100 DEG C, firing forge it is white, then again
It is forged with this and white reacted with ammonium sulfate, slurrying, filters, is dried to obtain Mg (OH)2Product.The patent is calcined also without utilization
The shortcomings that waste heat of process, there are complex process, water consumption greatly, high energy consumption.
A large amount of waste heat is will produce during preparing light-burned MgO using magnesite calcining, can be used recycling profit
It is used as light-burned MgO and Mg (OH) is prepared with hydration method2Heat source for reaction.Therefore, light-burned MgO is prepared in suspension kiln calcined magnesite
During, prepare Mg (OH) using firing waste heat coproduction2It is a kind of economically and reasonably production technology, has saved the energy, reduces
Production cost.
Invention content
The purpose of the present invention is to provide the low light-burned MgO preparation methods of firing heat consumption, and are prepared using calcined magnesite
Waste heat coproduction during light-burned MgO prepares Mg (OH)2Production technology and device, both reduced the complexity of production technology,
The waste heat in calcination process is recycled again, the energy has been saved, has reduced production cost.
Realizing above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of light-burned MgO suspension kilns coproduction Mg (OH)2Process units, including raw material cabin, Category Four cyclone preheater, decompose
Stove, cyclone separator fluidize cooling bed, hydration reaction tower, finished product collection dust-precipitator, finished bin, the wherein feed opening of raw material cabin
Be connected to the air outlet of two level cyclone preheater by conveying equipment, the air outlet of two level cyclone preheater by connect air hose with
The air inlet of one cyclonic preheater is connected, the discharge port of one cyclonic preheater by expects pipe and two level cyclone preheater into
Air port is connected, and the air outlet of three-level cyclone preheater is connected by connecting air hose with the air inlet of two level cyclone preheater, two level
The discharge port of cyclone preheater is connected by expects pipe with the air inlet of three-level cyclone preheater, the air outlet of Category Four cyclone preheater
It is connected with the air inlet of three-level cyclone preheater by connecting air hose, the discharge port of three-level cyclone preheater passes through expects pipe and level Four
The air inlet of cyclone preheater is connected, and the discharge port of Category Four cyclone preheater passes through expects pipe and the feed inlet phase for decomposing furnace bottom
Even, the air outlet at the top of dore furnace is connected by connecting air hose with the air inlet of cyclone separator, the air outlet of cyclone separator
It is connected with the air inlet of Category Four cyclone preheater by connecting air hose, the discharge port of cyclone separator is by switching gate through expects pipe
It is connected respectively with hydration reaction tower and the cooling bed feed inlet of fluidisation, fluidizes cooling bed discharge port and pass through expects pipe and MgO finished bins
It is connected, fluidizes cooling bed air outlet and collect dust-precipitator by connecting air hose and MgO finished products and be connected, MgO finished products collection dust-precipitator
Gas outlet be connected with chimney by air-introduced machine, collect the MgO finished products to get off send to MgO finished bins store, hydration reaction tower
Air outlet is by connecting air hose and Mg (OH)2Finished product collects dust-precipitator and is connected, Mg (OH)2The gas outlet that finished product collects dust-precipitator is logical
It crosses air-introduced machine with chimney to be connected, collects the Mg (OH) to get off2Finished product is sent to Mg (OH)2Finished bin stores.
In above-mentioned apparatus, dore furnace is equipped with three sets of combustion systems in short transverse, is located at top, the middle part of dore furnace
And bottom, often cover combustion system can independent operating, and be evenly arranged four combustor nozzles in dore furnace stove radial direction, make
It it is 90 ° for preferred adjacent burner angle in the horizontal direction.
In above-mentioned apparatus, the flap valve with counterweight balance is equipped on the tremie pipe of cyclone preheaters at different levels.
In above-mentioned apparatus, the flap valve with counterweight balance is equipped at the tremie pipe of cyclone separator, flap valve is arranged below
Switch gate, feeding respectively can be needed after the high temperature MgO chamotte powder gas solid separations of having calcined suspension kiln to fluidize according to production cold
But bed cooling prepares light-burned MgO or the hydration of hydration reaction tower prepares Mg (OH)2。
In above-mentioned apparatus, fluidizing and be equipped with tube bank row pattern cooling water pipe in cooling bed, water inlet is connected with municipal tap water, and
Ensure that inflow temperature is less than 25 DEG C, water outlet is connected with factory bathroom, and ensures leaving water temperature less than 55 DEG C.
In above-mentioned apparatus, the air in fluid bed used in fluidization is provided by wind turbine, and wind turbine is placed in fluid bed lower part, passes through
Connection air hose is connected with the air inlet of fluid bed, and flow distribution plate is placed in inside fluid bed, is located at cooling water pipe lower part, can carry wind turbine
The air-flow of confession is evenly distributed on fluid bed section.
In above-mentioned apparatus, hydration reaction top of tower is equipped with distilled water sparge pipe, and bottom is equipped with frequency conversion fan, can make by reacting
The high temperature MgO powders of tower lower part feed inlet feeding are in suspended state.
Light-burned MgO and Mg (OH) is carried out to implement the invention device2Industrialized production, the present invention is using following production work
Skill：By the magnesium carbonate powder in raw material cabin by being sent into two level cyclone preheater gases exit line by conveying equipment, make in air-flow
Disperse immediately under, suspend in the gas flow, and enter one cyclonic preheater preheat, after it is pre- through two level, three-level, Category Four cyclone
Hot device enters dore furnace calcining and decomposing after preheating step by step, and sintered MgO clinkers are after cyclone separator gas solid separation, according to life
It produces and needs to fluidize cooling bed or hydration reaction tower through switching gate feeding, the high temperature MgO chamotte powder cooling bed into fluidisation is through depth
After degree is cooling, enters MgO finished products with air-flow and collect dust-precipitator, gas solid separation is realized in dust-precipitator, the exhaust gas warp separated
Air-introduced machine is discharged by chimney, collects the MgO finished products to get off through conveying equipment feeding MgO finished bins storage, into hydration reaction tower
High temperature MgO chamotte powders under suspended state with sparge pipe spray into distilled water carry out hydration reaction, complete hydration reaction after
To Mg (OH)2Powder enters Mg (OH) under airflow function2Finished product collects dust-precipitator, and gas solid separation is realized in dust-precipitator, point
It separates out the exhaust gas come to be discharged by chimney through air-introduced machine, collects the Mg (OH) to get off2Finished product is through conveying equipment feeding Mg (OH)2Finished product
Storehouse stores.
In above-mentioned technique, by the unlatching number of the combustor nozzle of three sets of combustion systems on adjusting dore furnace and accordingly
Gas flow, can make the temperature field in dore furnace within the scope of 700 DEG C~1100 DEG C stablize, to realize the light of different activities
Burn the accurate subregion calcining of MgO.
In above-mentioned technique, reaction temperature precision in order to control, the inlet and outlet of Category Four cyclone preheater, the inlet and outlet of dore furnace,
At the combustor nozzle of three sets of combustion systems, the inlet and outlet of cyclone separator, fluidize cooling bed inlet and outlet and hydration reaction tower
Inlet and outlet be equipped with hygrosensor, and the gas quantity data of temperature data and the combustion system at each position are passed through into computer
System carries out coordinated signals, to ensure the stability of calcination temperature.
In above-mentioned technique, gate direction of rotation is switched by adjusting, it can be by the high temperature after cyclone separator gas solid separation
MgO chamotte powders feed the cooling bed cooling of fluidisation and prepare light-burned MgO or hydration reaction tower hydration preparation Mg (OH) respectively2。
In above-mentioned technique, fluidizes air used in cooling bed interior fluidisation state and provided by wind turbine, fluidized wind makes high temperature MgO chamotte powders
It is in fluidization in fluidisation is cooling bed, is then that cooling medium passes through the cooling bed interior tube bank row pattern cooling water pipe pair of fluidisation with water
High temperature MgO chamotte powders carry out depth cooling, and MgO chamotte powders after cooling are set after MgO finished products collect dust-precipitator collection by conveying
Standby feeding MgO finished bins storage.
In above-mentioned technique, the cold water for fluidizing the tube bank row pattern cooling water pipe in cooling bed is provided by municipal tap water, is exchanged heat
Hot water afterwards is used for plant area's employee's bathing, effectively increases the utilization rate of waste heat.
In above-mentioned technique, the high temperature MgO chamotte powders of hydration reaction tower are fed under the action of reacting tower bottom frequency conversion fan
In suspended state, the distilled water sprayed into sparge pipe at the top of reaction tower occurs hydration reaction and generates Mg (OH) under the high temperature conditions2, instead
Mg (OH) after answering2With together with thermal current Mg (OH) is escaped into from hydration reaction tower upper part discharge port2Finished product collects dust-precipitator,
Being collected after dust-precipitator is collected through product has conveying equipment to feed Mg (OH)2Finished bin stores.
In above-mentioned technique, in order to ensure Mg (OH)2The extent of reaction, in hydration reaction during high temperature MgO in reaction tower
Chamotte powder feeding capacity is preferably 1 by molar ratio is reacted with the penetrating flow of distilled water:1.1, a large amount of Mg generated after hydration reaction
(OH)2It is dried to get to dry powder-shaped Mg (OH) by the heat from high temperature MgO chamotte powders with unreacted a small amount of distilled water2。
In above-mentioned technique, into the heat entrained by the high temperature MgO chamotte powders in hydration reaction tower, you can for accelerating
The hydration reaction rate of MgO and distilled water, and can be used for drying remaining distilled water after hydration reaction, entire reaction process is not required to
It wants external heat source to heat, effectively reduces Mg (OH)2Production cost.
Compared with prior art, beneficial effects of the present invention are：(1), decompose burner in the stove burner to be uniformly distributed, in stove
Calcination temperature field stability is good, and calcination temperature adjustable extent is wide, it can be achieved that the accurate subregion of the light-burned MgO of different activities is forged
It burns, good product quality, provides safeguard for popularization and application of the light-burned MgO in building trade；(2) it is, cooling medium with water, is flowing
Change it is cooling bed it is interior the indirect depth of high temperature MgO chamotte powders is cooled down, significantly reduce the drop temperature of MgO chamotte powders, can realize out
Kiln MgO chamotte powders directly pack manufacture, are conducive to the production efficiency for promoting light-burned MgO；(3) it is, reaction with high temperature MgO chamotte powders
Main body is moderately reacted in hydration reaction tower with distilled water, is efficiently used the included heat of MgO chamotte powders, on the one hand can be accelerated
On the other hand hydration reaction rate can provide the Mg (OH) of hydration reaction preparation2Drying source, realize Mg (OH)2Cleaning warp
Ji production.
Description of the drawings
Fig. 1 show the light-burned MgO suspension kilns coproduction Mg (OH) of the present invention2Process units process flow chart.
In figure：1 is raw material cabin, and 2 be one cyclonic preheater, and 3 be hygrosensor, and 4 be the first flap valve, and 5 be two level
Cyclone preheater, 6 be the second flap valve, and 7 be three-level cyclone preheater, and 8 be third flap valve, and 9 be connection air hose, and 10 be level Four
Cyclone preheater, 11 the 4th flap valves, 12 be tremie pipe, and 13 be dore furnace, and 14 be the first combustion system, and 15 are for the second burning
System, 16 be third combustion system, and 17 be cyclone separator, and 18 be the 5th flap valve, and 19 be high-temperature blower, and 20 receive for exhaust-gas treatment
Dirt device, 21 be switching gate, and 22 is cooling bed to fluidize, and 23 be cooling water pipe, and 24 be flow distribution plate, and 25 be the first frequency conversion fan, 26
It is cooling water pipe water outlet for cooling water pipe water inlet, 27,28 collect dust-precipitator for MgO finished products, and 29 be the first chimney, and 30 are
MgO finished bins, 31 be hydration reaction tower, and 32 be water jet, and 33 be the second frequency conversion fan, and 34 be Mg (OH)2Finished product gathers dust
Device, 35 be the second chimney, and 36 be Mg (OH)2Finished bin.
Specific implementation mode
To keep present disclosure more obvious and easy to understand, the present invention is done into one with reference to the accompanying drawings and detailed description
Walk explanation.
A kind of light-burned MgO suspension kilns coproduction Mg (OH)2Process units, as shown in Figure 1, including raw material cabin 1, one cyclonic
Preheater 2, two level cyclone preheater 5, three-level cyclone preheater 7, Category Four cyclone preheater 10, dore furnace 13, cyclone separator
17, cooling bed 22, hydration reaction tower 31 is fluidized, MgO finished products collect dust-precipitator 28, Mg (OH)2Finished product collects dust-precipitator 34, MgO
Finished bin 30, Mg (OH)2Finished bin 36；It is characterized in that：Wherein the feed opening of raw material cabin 1 passes through conveying equipment and two level whirlwind
The air outlet of preheater 5 is connected to, the air outlet of two level cyclone preheater 5 by connect air hose 9 and one cyclonic preheater 2 into
Air port is connected, and the discharge port of one cyclonic preheater 2 is connected by expects pipe 12 with the air inlet of two level cyclone preheater 5, three-level
The air outlet of cyclone preheater 7 is connected by connecting air hose 9 with the air inlet of two level cyclone preheater 5, two level cyclone preheater 5
Discharge port be connected with the air inlet of three-level cyclone preheater 7 by expects pipe 12, the air outlet of Category Four cyclone preheater 10 passes through
Connection air hose 9 is connected with the air inlet of three-level cyclone preheater 7, and the discharge port of three-level cyclone preheater 7 passes through expects pipe and level Four
The air inlet of cyclone preheater 10 is connected, the discharge port of Category Four cyclone preheater 10 by expects pipe 12 and 13 bottom of dore furnace into
Material mouth is connected, and the air outlet at 13 top of dore furnace is connected by connecting air hose 9 with the air inlet of cyclone separator 17, cyclonic separation
The air outlet of device 17 is connected by connecting air hose 9 with the air inlet of Category Four cyclone preheater 10, the discharge port of cyclone separator 17
It is connected respectively with hydration reaction tower 31 and cooling bed 22 feed inlet of fluidisation through expects pipe 12 by switching gate 21, fluidisation cooling bed 22
Discharge port be connected with MgO finished bins 30 by expects pipe 12, the air outlet of fluidisation cooling bed 22 by connect air hose 12 and MgO at
Product collect dust-precipitator 28 and are connected, and the gas outlet that MgO finished products collect dust-precipitator 28 is connected by air-introduced machine with chimney 29, and collection is got off
MgO finished products send to MgO finished bins 30 and store, the air outlet of hydration reaction tower 31, which passes through, connects air hose 9 and Mg (OH)2Finished product is received
Collect dust-precipitator 34 to be connected, Mg (OH)2The gas outlet that finished product collects dust-precipitator 34 is connected by air-introduced machine with chimney 35, and collection is got off
Mg (OH)2Finished product is sent to Mg (OH)2Finished bin 36 stores.
In above-mentioned apparatus, dore furnace is equipped with three sets of combustion systems in short transverse, and the first combustion system 14 is located at dore furnace
Bottom, the second combustion system 15 is located at the middle part of dore furnace, and third combustion system 16 is located at the top of dore furnace, often set burning
System can independent operating, and four combustor nozzles are evenly arranged in dore furnace stove radial direction, as preferred adjacent burner
Angle in the horizontal direction is 90 °.
In above-mentioned apparatus, separative efficiency is influenced to prevent air-flow from playing a reversed role along tremie pipe, on the tremie pipe of cyclone cylinders at different levels
Equipped with the flap valve with counterweight balance, the wherein tremie pipe of one cyclonic preheater 2 is equipped with the first flap valve 4, two level whirlwind
The tremie pipe of preheater 5 is equipped with the second flap valve 6, and the tremie pipe of three-level cyclone preheater 7 is equipped with third flap valve 8, and four
Grade 10 tremie pipe of cyclone preheater is equipped with the 4th flap valve 11, and the tremie pipe of cyclone separator 17 is equipped with the 5th flap valve
18, by adjusting weight position in actual production process, control turnover panel movement range size, it is ensured that material is smooth, and stream is continuous
Uniformly.
In above-mentioned apparatus, switching gate 21 is arranged below in the flap valve 18 of cyclone separator, can need hang according to production
Cooling bed 22 cooling of feeding fluidisation prepares light-burned MgO or hydration respectively after the high temperature MgO chamotte powder gas solid separations that floating kiln has been calcined
The hydration of reaction tower 31 prepares Mg (OH)2。
In above-mentioned apparatus, the water inlet 26 and municipal tap water pipe phase of the tube bank row pattern cooling water pipe 23 in cooling bed are fluidized
Even, inflow temperature is less than 25 DEG C, and the water outlet 27 of tube bank row pattern cooling water pipe 23 is connected with bathroom, bathes indoor hot water and can be used for
Employee's bathing.
In above-mentioned apparatus, the air in fluid bed 22 used in fluidization is provided by the first frequency conversion fan 25, frequency conversion fan 25
It is placed in 22 lower part of fluid bed, is connected with the air inlet of fluid bed 22 by connecting air hose 9, flow distribution plate 24 is placed in fluid bed 22
Portion is located at 23 lower part of cooling water pipe, the air-flow that frequency conversion fan 25 provides can be evenly distributed on fluid bed section.
In above-mentioned apparatus, 31 top of hydration reaction tower is equipped with distilled water sparge pipe 32, and bottom is equipped with the second frequency conversion fan 33,
It is connected with the air inlet of hydration reaction tower 31 by connecting air hose 9, the high temperature MgO powder fed by reaction tower lower part feed inlet can be made
Material is in suspended state.
Below by calcining light-burned MgO coproduction Mg (OH) using the process units of the present invention2Application Example work
Skill flow describes, and is further elaborated to the production technology of the present invention.
The production technology that light-burned MgO is produced using apparatus of the present invention is：Magnesium carbonate powder in raw material cabin is by conveying equipment
It is sent into two level whirlwind and preheats cylinder gases exit line, disperse immediately under airflow function, suspend in the gas flow, and enter with air-flow
One cyclonic preheater.After Conveyance, magnesium carbonate powder enters three-level cyclone preheater gas vent by weight flap valve
Pipeline, and enter two level cyclone preheater with air-flow.And so on, magnesium carbonate raw meal powder respectively pass through level-one, two level, three-level,
After Category Four cyclone preheater and its connecting pipe complete heat exchange, be fully warmed-up, through Category Four cyclone preheater collect into
Enter dore furnace, hot raw material carry out heat exchange in dore furnace with the high-temperature gas after combustion of natural gas, keep magnesium carbonate abundant
It decomposes.Sintered MgO clinkers enter cyclone separator with air-flow and carry out gas solid separation, and the high temperature MgO chamotte powders of separation pass through
5th flap valve and switching gate, which enter, fluidizes cooling bed, the first frequency conversion fan offer fluidized wind, and by being located at fluidisation cooling
Fluidized wind is evenly distributed on the cooling bed section of fluidisation by the flow distribution plate in bed, and it is in fluidization to make high temperature MgO chamotte powders, then with water
For cooling medium, depth cooling is carried out by the tube bank row pattern cooling water pipe fluidized in cooling bed, MgO chamotte powders after cooling with
Air-flow escapes into MgO finished products at the top of fluid bed and collects dust-precipitator together, and gas solid separation is realized in finished product collects dust-precipitator,
The exhaust gas separated is discharged by the first chimney, collects the MgO finished products to get off through conveying equipment feeding MgO finished bins storage.
Utilize apparatus of the present invention production Mg (OH)2Production technology be：Magnesium carbonate powder in raw material cabin is by conveying equipment
It is sent into two level whirlwind and preheats cylinder gases exit line, disperse immediately under airflow function, suspend in the gas flow, and enter with air-flow
One cyclonic preheater.After Conveyance, magnesium carbonate powder enters three-level cyclone preheater gas vent by weight flap valve
Pipeline, and enter two level cyclone preheater with air-flow.And so on, magnesium carbonate raw meal powder respectively pass through level-one, two level, three-level,
After Category Four cyclone preheater and its connecting pipe complete heat exchange, be fully warmed-up, through Category Four cyclone preheater collect into
Enter dore furnace, hot raw material carry out heat exchange in dore furnace with the high-temperature gas after combustion of natural gas, keep magnesium carbonate abundant
It decomposes.Sintered MgO clinkers enter cyclone separator with air-flow and carry out gas solid separation, and the high temperature MgO chamotte powders of separation pass through
5th flap valve and switching gate enter hydration reaction tower, feed the high temperature MgO chamotte powders of hydration reaction tower in reaction tower bottom
It is in suspended state under the action of frequency conversion fan, it is anti-that hydration occurs under the high temperature conditions for the distilled water sprayed into sparge pipe at the top of reaction tower
Mg (OH) should be generated2, in hydration reaction during in reaction tower the penetrating flow of high temperature MgO chamotte powders feeding capacity and distilled water press
It is 1 to react molar ratio:1.1, the Mg (OH) after reaction2With together with thermal current Mg is escaped into from hydration reaction tower upper part discharge port
(OH)2Finished product collects dust-precipitator, realizes gas solid separation in finished product collects dust-precipitator, the exhaust gas separated is arranged by the second chimney
Go out, collects the Mg (OH) to get off2Finished product is through conveying equipment feeding Mg (OH)2Finished bin stores.High temperature into hydration reaction tower
Heat entrained by MgO chamotte powders, you can the hydration reaction rate for accelerating MgO and distilled water, and can be used for drying hydration
Remaining distilled water after reaction, entire reaction process do not need external heat source heating, effectively reduce Mg (OH)2Production cost.
Claims (10)
1. a kind of light-burned MgO suspensions coproduction prepares Mg (OH)2Production technology, it is characterised in that magnesium carbonate powder is by two level whirlwind
The feeding of cylinder gas outlet conduit is preheated, enters after level-one, two level, three-level, Category Four cyclone preheater step by step suspension preheating and decomposes
Stove calcining and decomposing, it is cooling bed that sintered MgO clinkers feed fluidisation respectively after cyclone separator gas solid separation, by switching gate
Or hydration reaction tower, high temperature MgO chamotte powders can be prepared by light-burned MgO finished products, hydration reaction tower after fluidizing cooling bed interior cooling
Mg (OH) is can be prepared by after interior and distilled water hydration reaction2Finished product.
2. light-burned MgO suspensions coproduction according to claim 1 prepares Mg (OH)2Production technology, which is characterized in that enter
Cooling bed high temperature MgO chamotte powders are fluidized under fluidized wind effect in fluidisation state, are that cooling medium is cooling bed by fluidizing with water
Interior tube bank row pattern cooling water pipe carries out it depth cooling, and MgO chamotte powders after cooling are collected dust-precipitator through MgO finished products and collected
Afterwards, by conveying equipment feeding MgO finished bins storage.
3. light-burned MgO suspensions coproduction according to claim 1 prepares Mg (OH)2Production technology, which is characterized in that feeding
The high temperature MgO chamotte powders of hydration reaction tower are in suspended state under the action of reacting tower bottom frequency conversion fan, are sprayed at the top of reaction tower
The distilled water that water pipe sprays into occurs hydration reaction and generates Mg (OH) under the high temperature conditions2, in hydration reaction during in reaction tower
High temperature MgO chamotte powders feeding capacity is preferably 1 by molar ratio is reacted with the penetrating flow of distilled water:1.1, the Mg (OH) after reaction2With
Thermal current escapes into Mg (OH) from hydration reaction tower upper part discharge port together2Finished product collects dust-precipitator, gathers dust through product
Device has conveying equipment to feed Mg (OH) after collecting2Finished bin stores.
4. the light-burned MgO suspension kilns coproduction Mg (OH) described in any one of claim 1-32Process units, including raw material cabin
1, one cyclonic preheater 2, two level cyclone preheater 5, three-level cyclone preheater 7, Category Four cyclone preheater 10, dore furnace 13,
Cyclone separator 17 fluidizes cooling bed 22, hydration reaction tower 31, MgO finished products collection dust-precipitator 28, Mg (OH)2Finished product is collected
Dirt device 34, MgO finished bins 30, Mg (OH)2Finished bin 36；It is characterized in that：The feed opening of wherein raw material cabin 1 passes through conveying equipment
It is connected to the air outlet of two level cyclone preheater 5, the air outlet of two level cyclone preheater 5 is by connecting air hose 9 and one cyclonic
The air inlet of preheater 2 is connected, the air inlet that the discharge port of one cyclonic preheater 2 passes through expects pipe 12 and two level cyclone preheater 5
Mouth is connected, and the air outlet of three-level cyclone preheater 7 is connected by connecting air hose 9 with the air inlet of two level cyclone preheater 5, two level
The discharge port of cyclone preheater 5 is connected by expects pipe 12 with the air inlet of three-level cyclone preheater 7, Category Four cyclone preheater 10
Air outlet is connected by connecting air hose 9 with the air inlet of three-level cyclone preheater 7, and the discharge port of three-level cyclone preheater 7 passes through
Expects pipe is connected with the air inlet of Category Four cyclone preheater 10, and the discharge port of Category Four cyclone preheater 10 passes through expects pipe 12 and dore furnace
The feed inlet of 13 bottoms is connected, and the air outlet at the top of dore furnace 13 passes through the air inlet phase for connecting air hose 9 and cyclone separator 17
Even, the air outlet of cyclone separator 17 is connected by connecting air hose 9 with the air inlet of Category Four cyclone preheater 10, cyclone separator
17 discharge port is connected with hydration reaction tower 31 and cooling bed 22 feed inlet of fluidisation by switching gate 21 through expects pipe 12 respectively, is flowed
Change cooling bed 22 discharge port by expects pipe 12 to be connected with MgO finished bins 30, the air outlet of fluidisation cooling bed 22, which passes through, connects wind
Pipe 12 collects dust-precipitator 28 with MgO finished products and is connected, and the gas outlet that MgO finished products collect dust-precipitator 28 passes through air-introduced machine and 29 phase of chimney
Even, the air outlet of hydration reaction tower 31 is by connecting air hose 9 and Mg (OH)2Finished product collects dust-precipitator 34 and is connected, Mg (OH)2Finished product
The gas outlet for collecting dust-precipitator 34 is connected by air-introduced machine with chimney 35.
5. light-burned MgO suspension kilns coproduction Mg (OH) according to claim 42Process units, which is characterized in that level Four revolve
The inlet and outlet of wind preheater, the inlet and outlet of dore furnace, three sets of combustion systems combustor nozzle at, the disengaging of cyclone separator
Mouth, the inlet and outlet for fluidizing cooling bed inlet and outlet and hydration reaction tower are equipped with hygrosensor.
6. light-burned MgO suspension kilns coproduction Mg (OH) according to claim 42Process units, which is characterized in that Ge Jixuan
It is equipped with the flap valve with counterweight balance on the tremie pipe of wind preheater sum.
7. light-burned MgO suspension kilns coproduction Mg (OH) according to claim 42Process units, which is characterized in that whirlwind point
From the flap valve with counterweight balance is equipped at the tremie pipe of device, switching gate is arranged below in flap valve.
8. light-burned MgO suspension kilns coproduction Mg (OH) according to claim 42Process units, which is characterized in that fluidisation it is cold
But tube bank row pattern cooling water pipe is equipped in bed, water inlet is connected with municipal tap water, and water outlet is connected with factory bathroom.
9. light-burned MgO suspension kilns coproduction Mg (OH) according to claim 42Process units, which is characterized in that wind turbine is set
In fluid bed lower part, it is connected with the air inlet of fluid bed by connecting air hose, flow distribution plate is placed in inside fluid bed, is located at cooling water
Pipe lower part.
10. light-burned MgO suspension kilns coproduction Mg (OH) according to claim 42Process units, which is characterized in that hydration is anti-
Top of tower is answered to be equipped with distilled water sparge pipe, bottom is equipped with frequency conversion fan.
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| CN109574049A (en) * | 2019-01-23 | 2019-04-05 | 大连海事大学 | A kind of magnesium hydroxide slurry aquation synthetic method that molten speed is controllable |
| CN112591774A (en) * | 2020-11-18 | 2021-04-02 | 潍坊凯博镁盐有限公司 | Method for preparing magnesium hydroxide by dry method |
| CN112661422A (en) * | 2021-01-27 | 2021-04-16 | 辽宁荣邦科技有限公司 | Energy-saving flash suspension kiln system |
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