CN103922369A - Process of producing magnesium carbonate-series products by dolomite lime smoke gas desulfurization carbon-drop power generation - Google Patents

Process of producing magnesium carbonate-series products by dolomite lime smoke gas desulfurization carbon-drop power generation Download PDF

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CN103922369A
CN103922369A CN201410112442.5A CN201410112442A CN103922369A CN 103922369 A CN103922369 A CN 103922369A CN 201410112442 A CN201410112442 A CN 201410112442A CN 103922369 A CN103922369 A CN 103922369A
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magnesium
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carbonate
dolomite
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彭振超
韩默先
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Abstract

The invention relates to a process of producing magnesium carbonate-series products by dolomite lime smoke gas desulfurization carbon-drop power generation. Dolomite lime smoke gas desulfurization is carried out, smoke gas carbon dioxide is used for carbonizing dolomite lime milk for dropping carbon, kiln gas thermal pollution is transformed into electric energy for satisfying most of power consumption of the system; secondary low-level heat energy steam drying system products which are light magnesium carbonate, magnesium hydroxide and light calcium carbonate are exhausted after generating power; tertiary hot water with low-level heat energy obtained by drying products is used for supplying heat and returning to a power-generating waste heat boiler; and a desulfurization product is used for preparing gypsum to realize zero emission of the waste. The process disclosed by the invention belongs to the technical field of coal smoke gas control, utilizes a method that system magnesium hydroxide is directly in double decomposition with heavy-magnesium water formed by dolomite lime carbon-drop to produce light magnesium carbonate, so that novel magnesium salt production innovation is initiated, and therefore, a novel development direction is pointed for combining modern fuel coal industry with magnesium salt chemical engineering, powerful technical support is provided, and especially outlet is pointed for industrial survival which takes fire coals and mining resources as advantages.

Description

Magnesiumcarbonate series product technique is produced in the generating of calcined dolomite in powder flue gas desulfurization carbon drop
Technical field
The invention belongs to sulfur dioxide pollution control techniques field.Relate to coal-fired flue-gas cogeneration, calcined dolomite in powder flue gas desulfurization, flue gas carbonic acid gas carbonization Dolomite milk carbon drop, generating secondary Lowlevel thermal energy steam drying Magnesium Carbonate Light 41-45, magnesium hydroxide and light calcium carbonate, moisture eliminator water of condensation--three Lowlevel thermal energy hot-water heatings or loop back waste heat boiler, and desulfurization product is produced the utilization of coal-fired furnace fume afterheat, the desulfurization carbon drop of gypsum implementation procedure waste zero release and produces price product process integration.
Background technology
Oxysulfide SO xmainly refer to that sulfurous gas and sulphur trioxide are to cause atmospheric pollution to form one of essential substance of haze weather phenomena, very large to environment, ecology, Economic development and human health damage.
Carbonic acid gas CO 2it is the major cause that causes Greenhouse effect.
Along with rate of industrial development speeds, coal resource is more and more nervous, and coal type change is increasing, and the coal consumption increasing year by year of sulphur content high (high sulphur coal 1%-4%), causes China SO xand CO 2discharge intensity far above world average level, havoc the mankind and social survival and development environment.Eliminate the backward production facilities, adjust industrial enterprise's structure, the transformation of quickening enterprise upgrading, pressure restriction and dismounting pollution equipment, order the behave of closing contaminating enterprises' operation etc. country and local government further to be implemented without mercy.Around environmental pollution regulation, the construction of developing the economy, solves social people's livelihood problem and also urgently puts in government and functional department at different levels.The whole society all focuses on serious regulation and pollutes and develop the economy in these serious problems of paradox of building.Encouragement enterprise implement environmental-protecting process, the relevant policies that use clear energy sources, collection environmental improvement to bring back to life strong industry effective way, the special green technology difficult problem of bid solution, change conventional industries technical matters emerge in an endless stream.Energy type particularly coal resources and Mineral resources mating type industry meets with the serious challenge never running in face of choice between life and death.
Haze and Air quality for the severe environment of mouth benefit worsen, and country has implemented PM2.5 Detection of Air Quality and detected result is announced in real time.Long-term results shows: North China is the severely afflicated area that affected by haze, and in severely afflicated area, Beijing-Tianjin Ji area haze and Air quality are especially serious.Pollute in front ten the most serious cities in the whole nation, Hebei province accounts for 7.In these seven cities, Hebei province, it is very stable that Xingtai City enters the probability of first place, is national air-polluting focus.
Xingtai City is positioned at Hebei South, Taihang Shan Donglu, be one taking ore deposit, the medium-sized city as the extensive resources processing of advantage as main business such as coal, metallurgy, coking glass, cement, mechanical workout, making use of local resources is that locality is accustomed to for many years.
Taking Xingtai environmental improvement as example, municaipal Party committee and government and functional department at different levels attach great importance to over the years, a series of improvement policies are put into effect, a series of strong measures are taked, the slogan of " also I blue mountains and green waters " has been proposed, start " whole people massacre the inhabitants of a captured city " motion, strong enforcement " energy-saving and emission-reduction " plan, severe dismounting polluted equipment, high standard has been eliminated backward production facilities technique, hard closing contaminating enterprises, particularly adopt clean cut means big area to become industry to close down mine roughing enterprise and the industrial enterprise taking fire coal as the energy.
Wingdale, rhombspar taking western mountainous areas, Xingtai County and knob are exploited and are processed as main lime calcining industry as example, within the scope of 20 square kilometres of this resource clustering, concentrate on end 500 left and right of big or small lime burner furnace, each limestone kiln is on average produced lime ability daily and is reached 60-100 ton, single kiln day is burnt coal (sulphur content 2% left and right) more than 12 tons, each like this limestone kiln day desulphurization reaches 0.25 ton, amounts to 0.75 ton of sulfurous gas, and discharge carbonic acid gas reaches more than 40 tons.If these 500 limestone kilns produce continuously, day be discharged into airborne sulfurous gas and just reach 375 tons, carbonic acid gas reaches 20,000 tons, and this is a huge numeral.Although eliminated these years earth kiln, erect many mechanical kilns, particularly set up the large-scale multiseater tool of many centralization environmental protection kiln, and two industrialization gardens as leading taking lime and calcined dolomite in powder are respectively set up according to planning respectively, form 50,000 tons of abilities of daily output lime (comprising calcined dolomite in powder), day industrial output value reaches 1,500 ten thousand yuan, day tax revenue surpasses 1,000,000 industrially scalable, but, owing to there is no the measure of effective desulfurization carbon drop, closed down by government is very reluctantly in face of the severe environmental protection system.This is undoubtedly corporate boss's havoc economically, the massive losses in Ye Shi government property tax source.
As criterion, take effective technology measure and systems engineering means to give this industry in support taking " low exploitation, usury with, low emission ", on environmental requirement basis, to bring back to life this industry be the task of top priority meeting.Only rely on and use clear energy sources, limit improvement and restriction Carbon emission that the policies such as the coal-fired energy can not fundamentally solve from reality sulphur.Must stand in practical angle, taking the principles of science as guidance, take comprehensive technological means, capture the technical barrier of restriction industry development, for coal-fired industry provides rational use of energy, the waste gas comprehensive regulation recovery, economically feasible industry production and environment protection treating technical specifications, making it to bring benefit to the people benefits the society.
Coal-fired industrial furnace is the major cause polluting, and comprises the coal-fired industrial furnace of all conglomeraties such as various metallurgical furnaces, heat power plant's steam-electric power boiler, chemical industry calcining furnace and glass, cement, the pottery of metallurgy industry.
With regard to current desulfurization technology, various sulfur methods and technology are multifarious, emerge in an endless stream.Single with regard to coal-fired flue gas desulfurization, particularly taking heat power plant as main coal-fired flue gas desulfurization, current desulfurization technology is ripe and practical, especially with magnesium oxide or magnesium hydroxide desulfurization technology, obtains whole world accreditation.But also exist, investment is large, running is complicated, particularly also exist desulfurization not the discharge of de-carbon and desulfurization after product magnesium sulfate diluting soln form secondary groundwater pollution problem.In mass-producing enterprises such as metallurgy, thermoelectricity, chemical industry, desulfurization means are substantially all implemented in different aspects, and desulfurization means and existing problems and heat power plant are similar.But for lime production industry, due to the simple and unsophisticated tradition of technique, scattered distribution, centralization small scale, flue-gas temperature is relatively low and be negligent of the reasons such as supervision away from city, takes the discovery that rarely has of ash furnace desulfurization.Although this technology can grafting arrive lime production industry equally in theory, meets its desulfurization technology needs, simple huge investment and the cost of desulfurization is but the burden of lime industry.
The inventor has submitted " calcined dolomite in powder is for the method for flue gas desulfurization " application for a patent for invention, application number 02 Patent Office of Yue14Xiang State Intellectual Property Office in 2011: 201110039331.2, and open (bulletin) number: 102172472A.This invention is by cheap MgCl 2ingenious calcined dolomite in powder calcium magnesium separation problem, the Mg generating in its process (OH) of having solved of solution 2solve well flue gas desulfurization major issue, also made the calcined dolomite in powder of input and supplementary MgCl 2solution has finally been made into Mg (OH) 2or MgO finished product and CaSO 41/2H 2o plaster of Paris, has greatly reduced desulphurization cost, and make desulfurization behavior from pure input become profit become a reality.
Although this scheme has solved coal-fired flue gas desulfurization subject matter, also rationally solve desulfurization and only dropped into not output problem, but still there is defect in him, the one, there is no the reduction of discharging of fine solution carbonic acid gas and be recovered according to a price utilization, the 2nd, combine and also have large development space with other chemical units in comprehensive utilization of energy and intermediate product.Particularly, for common coal-fired energy consumption production industries such as class limies, also need to propose better embodiment.
Summary of the invention
The object of this invention is to provide a kind of new flue gas desulfurization carbon drop process integration, this technique is taking calcined dolomite in powder as sweetening agent, make coal-fired flue-gas make full use of again system heat energy and system substance characteristics simultaneously at cogeneration, desulfurization carbon drop, balanced production Magnesium Carbonate Light 41-45 series product, provide a kind of environmental protection and energy saving series product novel process from Chemical Manufacture angle.
Technique of the present invention is extensively applicable to general industry coal firing boiler fire coal (common coal-burned industrial boiler) flue gas of all trades and professions, why cross mainly with lime production industry and be described, the one, limestone kiln is substantially the most original coal-fired industrial furnace, and its sulfur-bearing carbon containing flue gas mechanism of production there is no different from other industrial furnaces; The 2nd, its flue-gas temperature is relatively low compared with other coal-fired industrial furnace, and UTILIZATION OF VESIDUAL HEAT IN is difficulty relatively; The 3rd, its added value of product is low, and desulfurization burden is heavier, has more cogency.
To limestone kiln, this technique has merged flue gas desulfurization and doctor solution transforms absorption, cogeneration and secondary Lowlevel thermal energy steam and even multistage heat energy utilization, calcined dolomite in powder carborization production Magnesium Carbonate Light 41-45 and calcium carbonate and lime and calcined dolomite in powder production technique, form a new process integration, the advantage of former separating technology in this process integration performed to ultimate attainment, on priority for environmental protection basis, realized resource, the energy has been realized " minimizing, recycling, recirculation ".This process integration sufficient raw, cheap, principle science, react fast, by product has higher use value and market outlook, solids and waste water are realized zero release standard.
Concerning broad sense coal-fired industry (common coal-fired industry or general reference coal-fired industrial furnace) flue gas, the present invention comprises four unit on the whole:
First module is that flue gas produces and calcined dolomite in powder is produced part (abbreviation lime calcining).The task of this unit is burnt and in ash furnace, mixed hard coal, rhombspar acquisition calcined dolomite in powder and sulfur-containing oxide SO by coal-fired industrial furnace xwith carbonic acid gas CO 2furnace gas or flue gas and coal-fired industrial furnace output finished product or work in-process.Industrial Stoves finished product or work in-process are for selling or subsequent technique processing, the calcined dolomite in powder part that ash furnace obtains is sent to the 3rd unit (flue gas desulfurization) desulfurization, part is sent to Unit the 4th (carbonization carbon drop) carbonization, and rest part can commodity selling; Furnace gas send second unit (cogeneration) for waste heat boiler or Waste Heat Generation and produces steam (also claiming secondary Lowlevel thermal energy steam).
Second unit is that cogeneration utilizes part.The effect of this part is absorb first module waste heat furnace gas and quote the 4th unit water of condensation (three Lowlevel thermal energy hot water) and carry out UTILIZATION OF VESIDUAL HEAT IN, the electric energy of output needs for system dynamic, the steam (secondary Lowlevel thermal energy steam) producing is for the 4th unit drying products, and the furnace gas of discharge send Unit the 3rd to carry out desulfurization.
Unit the 3rd is flue gas desulfurization part.The task one of this part is first module calcined dolomite in powder magnesium chloride solution to be implemented to calcium magnesium separate, and isolated magnesium hydroxide is sized mixing and removed the oxysulfide that second unit sends here in flue gas and form magnesium sulfate doctor solution; The 2nd, with isolated calcium chloride solution sulfate precipitate magnesium solution acquisition terra alba; Three are to provide oxygen magnesium oxide precipitation directly reacts with heavy magnesium water and generates magnesiumcarbonate (magnesium basic carbonate) precipitation for Part IV; The 4th, send the 4th unit drying and crushing preparing magnesium hydroxide product by unnecessary magnesium hydroxide.
Unit the 4th is carbon drop carbonization part, is also the part of producing of Magnesium Carbonate Light 41-45, calcium carbonate.The effect one of this part is to send first module here calcined dolomite in powder hydrolytic digestion to become dolomite plaster, carry out carbonization with the furnace gas after the 3rd unit desulfurization, in dolomite plaster, in magnesium hydroxide absorption furnace gas, carbon dioxide conversion is that heavy magnesium water enters liquid phase, oxygen calcium oxide becomes calcium carbonate and enters solid phase, and it is emptying that furnace gas becomes Purge gas; The 2nd, by heavy magnesium water and calcium carbonate solid-liquid separation, the secondary Lowlevel thermal energy steam drying calcium carbonate producing with second unit also obtains light calcium carbonate product through pulverizing; The 3rd, complete magnesium basic carbonate conversion reaction, Part III magnesium hydrate precipitate directly to be reacted with heavy magnesium water and generates magnesium basic carbonate, the secondary Lowlevel thermal energy steam drying producing with second unit obtains Magnesium Carbonate Light 41-45 product through pulverizing.
This part magnesium hydroxide reacts generation basic carbonate magnesium precipitate with heavy magnesium water be an important technology feature of the present invention, and this reaction is directly rapid, has huge power savings advantages compared with traditional pyrolysis method production magnesiumcarbonate.
To broad sense coal-fired industrial furnace flue gas, the technological process that the present invention takes is:
First in first module, implement dolomite calcination and coal-fired industrial furnace flue gas and produce.Taking hard coal as fuel and rhombspar drop into dolomite calcination kiln (ash furnace) calcining according to applicable ratio, make rhombspar (MgCO 3.CaCO 3) being converted into calcined dolomite in powder (Mgo.CaO), the feedstock conversion that coal-fired industrial furnace adds is corresponding finished product or work in-process; Meanwhile, produce the comparatively high temps flue gas that contains oxysulfide and carbonic acid gas composition.
At second unit, first module furnace gas is introduced to waste heat boiler and implement fume afterheat generating, institute's generated energy is for system dynamic, and after generating, steam (secondary Lowlevel thermal energy steam) is transported to Unit the 4th dry magnesiumcarbonate, calcium carbonate or magnesium hydroxide by pipeline; The overheated flue gas that changes flowing out from waste heat boiler directly send Part III desulfurization; Waste heat boiler water can adopt the water of condensation (three Lowlevel thermal energy hot water) forming after the 4th unit drying products.
In Unit the 3rd, implement desulfurization and reclaim gypsum.First by calcined dolomite in powder hydrolytic digestion and refine as Dolomite milk, with MgCL 2solution carries out calcium magnesium separating reaction, makes the Ca (OH) in calcined dolomite in powder Ruzhong 2be transformed into the CaCL that solubleness is high 2liquid enters liquid phase, makes the Mg (OH) in calcined dolomite in powder Ruzhong 2enter solid phase, washing has realized the separation of calcium magnesium after filtration, by isolated part Mg (OH) 2filter cake dilution reconciles into slurry, is transported to SO in absorptive unit and flue gas 2and SO 3and O 2desulfurization is carried out in reaction, makes SO 2and SO 3transform and form MgSO 4the aqueous solution, reaches desulfurization object; The MgSO that desulfurization is formed 4the CaCL that solution obtains in separating with calcium magnesium 2liquid carries out gypsum deposition reaction, forms CaSO42H 2o precipitation and MgCL 2solution, after sedimentation or filtering separation, solid is CaSO42H 2o (gypsum), and MgCL 2solution and Dolomite milk re-start calcium magnesium separating reaction; By isolated another part Mg (OH) 2filter cake is transported to Unit the 4th and reacts generation basic carbonate magnesium precipitate with heavy magnesium water; By isolated redundance Mg (OH) 2filter cake send the 4th unit second unit steam drying and pulverizes and can obtain magnesium hydroxide products.
Unit the 4th, implementing Magnesium Carbonate Light 41-45, light calcium carbonate and magnesium hydroxide produces, the furnace gas taking carbonic acid gas as master by Unit the 3rd after desulfurization, do reverse carbonization with dolomite plaster, carbonic acid gas enters from carbonating tower bottom, dolomite plaster from top spray or spraying and, fully contact with carbonic acid gas, make magnesium hydroxide enter liquid phase with Magnesium hydrogen carbonate (heavy magnesium water) form, calcium hydroxide enters solid phase with calcium carbonate form and implements to separate by filtration; The 3rd cell mesh magnesium hydrate precipitate is directly reacted with isolated heavy magnesium water and generates magnesium basic carbonate, filtering separation obtains magnesium basic carbonate filter cake, send moisture eliminator by magnesium basic carbonate, the secondary Lowlevel thermal energy steam that passes through generating with second section does thermal source, completes magnesiumcarbonate and is dried and passes through pulverizing acquisition Magnesium Carbonate Light 41-45 finished product; Send moisture eliminator by the calcium carbonate filter cake filtering to isolate, the secondary Lowlevel thermal energy steam that passes through generating with second section does thermal source, completes calcium carbonate and is dried and passes through pulverizing acquisition light calcium carbonate finished product; Magnesium hydrate precipitate unnecessary the 3rd cell mesh is directly done to thermal source with second section through the secondary Lowlevel thermal energy steam of generating, complete to be dried and to pass through to pulverize obtaining magnesium hydroxide finished product.
Concerning lime production industry, the present invention comprises four unit on the whole:
First module is that lime and calcined dolomite in powder are produced part (abbreviation lime calcining).The task of this unit is by mix hard coal, Wingdale in limestone kiln (ash furnace), in rhombspar ash furnace (ash furnace), mixes hard coal, rhombspar, obtains respectively lime, calcined dolomite in powder and sulfur-containing oxide SO after calcining xwith carbonic acid gas CO 2furnace gas or flue gas.Lime can form commodity selling; Calcined dolomite in powder can part as commodity selling, part be sent to the 3rd unit (flue gas desulfurization) desulfurization, part is sent to Unit the 4th (carbonization carbon drop) carbonization, rest part can commodity selling; Furnace gas send second unit (cogeneration) for waste heat boiler or Waste Heat Generation and produces steam (also claiming secondary Lowlevel thermal energy steam).
While implementing this unit, main equipment is lime calcining kiln (ash furnace).The quantity of its ash furnace can be one or more.When multiple ash furnace, can several ash furnaces be coupled together with smoke collection pipe road, make flue gas be convenient to concentrate and use and process, preferably use many of disjunctors such as 8 ash furnaces.The ratio of rhombspar ash furnace and lime stone kiln is not subject to this process technology limit, taking meet system to the needs of calcined dolomite in powder as main.Consider UTILIZATION OF VESIDUAL HEAT IN efficiency, can take flue insulation, shorten the measures such as duct length, make heat energy according to rationally using from high to low.In the time considering flue gas ash removal, should, first by dedusting and exquisite processing mode after heat, reduce flue-gas temperature loss especially.
Second unit is that cogeneration utilizes part.The effect of this part is absorb first module waste heat furnace gas and quote the 4th unit water of condensation (three Lowlevel thermal energy hot water) and carry out UTILIZATION OF VESIDUAL HEAT IN, the electric energy of output needs for system dynamic, the steam (secondary Lowlevel thermal energy steam) producing is for the 4th unit drying products, and the furnace gas of discharge send Unit the 3rd to carry out desulfurization.
Unit the 3rd is flue gas desulfurization part.The task one of this part is first module calcined dolomite in powder magnesium chloride solution to be implemented to calcium magnesium separate, and isolated magnesium hydroxide is sized mixing and removed the oxysulfide that second unit sends here in flue gas and form magnesium sulfate doctor solution; The 2nd, with isolated calcium chloride solution sulfate precipitate magnesium solution acquisition terra alba; Three are to provide magnesium hydrate precipitate directly reacts with heavy magnesium water and generates magnesiumcarbonate (magnesium basic carbonate) precipitation for Unit the 4th; The 4th, by unnecessary magnesium hydroxide drying and crushing preparing magnesium hydroxide product.
Unit the 4th is carbon drop carbonization part, is also the part of producing of Magnesium Carbonate Light 41-45, calcium carbonate.The effect one of this part is to send first module here calcined dolomite in powder hydrolytic digestion to become dolomite plaster, carry out carbonization with the furnace gas after the 3rd unit desulfurization, in dolomite plaster, in magnesium hydroxide absorption furnace gas, carbon dioxide conversion is that heavy magnesium water (Magnesium hydrogen carbonate) enters liquid phase, calcium hydroxide becomes calcium carbonate and enters solid phase, and it is emptying that furnace gas becomes Purge gas; The 2nd, by heavy magnesium water and calcium carbonate solid-liquid separation, the secondary Lowlevel thermal energy steam drying calcium carbonate producing with second unit also obtains light calcium carbonate product through pulverizing; The 3rd, complete magnesium basic carbonate conversion reaction, the 3rd unit magnesium hydrate precipitate directly to be reacted with heavy magnesium water and generates magnesium basic carbonate, the secondary Lowlevel thermal energy steam drying producing with second unit obtains Magnesium Carbonate Light 41-45 product through pulverizing.
This part magnesium hydroxide reacts generation basic carbonate magnesium precipitate with heavy magnesium water be an important technology feature of the present invention, and this reaction is directly rapid, has huge power savings advantages compared with traditional pyrolysis method production magnesiumcarbonate.
Taking lime production as example, the technological process that the present invention takes is:
First in first module, implement the calcining of rhombspar and Wingdale.Taking hard coal as fuel and rhombspar or Wingdale drop into respectively dolomite calcination kiln (ash furnace) or lime calcining kiln (ash furnace) calcining according to applicable ratio, make rhombspar (MgCO 3.CaCO 3) be converted into calcined dolomite in powder (Mgo.CaO), Wingdale (CaCO 3) be converted into lime (CaO); Meanwhile, produce the comparatively high temps flue gas that contains oxysulfide and carbonic acid gas composition.
At second unit, first module furnace gas is introduced to waste heat boiler and implement fume afterheat generating, institute's generated energy is for system dynamic, and after generating, steam (secondary Lowlevel thermal energy steam) is transported to Unit the 4th dry magnesiumcarbonate, calcium carbonate or magnesium hydroxide by pipeline; The overheated flue gas that changes flowing out from waste heat boiler directly send the 3rd unit desulfurization; Waste heat boiler water can adopt the water of condensation (three Lowlevel thermal energy hot water) forming after the 4th unit drying products.
In order to improve UTILIZATION OF VESIDUAL HEAT IN efficiency, can take flue gas Insulation, reduce flue gas temperature drop, improve one time residual heat generating efficiency.Delivery of steam after generating, also should take Insulation, to improve the temperature of secondary waste heat steam, improves drying effect.Dried three waste heats become the hot water of 80 degrees Celsius of left and right substantially, can be used for heating, also can be used for generating waste heat boiler and use, and more can after first heating, return to waste heat boiler.
In Unit the 3rd, implement desulfurization and reclaim gypsum.First by calcined dolomite in powder hydrolytic digestion and refine as Dolomite milk, with MgCL 2solution carries out calcium magnesium separating reaction, makes the Ca (OH) in calcined dolomite in powder Ruzhong 2be transformed into the CaCL that solubleness is high 2liquid enters liquid phase, makes the Mg (OH) in calcined dolomite in powder Ruzhong 2enter solid phase, washing has realized the separation of calcium magnesium after filtration, by isolated part Mg (OH) 2filter cake dilution reconciles into slurry, is transported to SO in absorptive unit and flue gas 2and SO 3and O 2desulfurization is carried out in reaction, makes SO 2and SO 3transform and form MgSO 4the aqueous solution, reaches desulfurization object; The MgSO that desulfurization is formed 4the CaCL that solution obtains in separating with calcium magnesium 2liquid carries out gypsum deposition reaction, forms CaSO42H 2o precipitation and MgCL 2solution, after sedimentation or filtering separation, solid is CaSO42H 2o (gypsum), and MgCL 2solution and Dolomite milk re-start calcium magnesium separating reaction; By isolated another part Mg (OH) 2filter cake is transported to Unit the 4th and reacts generation basic carbonate magnesium precipitate with heavy magnesium water; By isolated redundance Mg (OH) 2filter cake send the 4th unit second unit steam drying and pulverizes and can obtain magnesium hydroxide products.
Unit the 4th, implementing Magnesium Carbonate Light 41-45, light calcium carbonate and magnesium hydroxide produces, the furnace gas taking carbonic acid gas as master by Unit the 3rd after de-dredging, do reverse carbonization with dolomite plaster, carbonic acid gas enters from carbonating tower bottom, dolomite plaster from top spray or spraying and, fully contact with carbonic acid gas, make magnesium hydroxide enter liquid phase with Magnesium hydrogen carbonate (heavy magnesium water) form, calcium hydroxide enters solid phase with calcium carbonate form and implements to separate by filtration; The 3rd cell mesh magnesium hydrate precipitate is directly reacted with isolated heavy magnesium water and generates magnesium basic carbonate, filtering separation obtains magnesium basic carbonate filter cake, send moisture eliminator by magnesium basic carbonate, the secondary Lowlevel thermal energy steam that passes through generating with second unit does thermal source, completes magnesiumcarbonate and is dried and passes through pulverizing acquisition Magnesium Carbonate Light 41-45 finished product; Send moisture eliminator by the calcium carbonate filter cake filtering to isolate, the secondary Lowlevel thermal energy steam that passes through generating with second unit does thermal source, completes calcium carbonate and is dried and passes through pulverizing acquisition light calcium carbonate finished product; Magnesium hydrate precipitate unnecessary the 3rd cell mesh is directly done to thermal source with second unit through the secondary Lowlevel thermal energy steam of generating, complete to be dried and to pass through to pulverize obtaining magnesium hydroxide finished product.
The chemical principle of foundation of the present invention is:
Limestone calcination CaCO 3→ CaO+CO 2↑ (1)
Dolomite calcination MgCO 3caCO 3→ MgOCaO+2CO 2↑ (2)
Hydrolytic digestion MgOCaO+2H 2o → Mg (OH) 2ca (OH) 2(3)
Calcium magnesium separates Mg (OH) 2ca (OH) 2+ MgCL 2→ 2Mg (OH) 2↓+CaCL 2(4)
SO 2remove Mg (OH) 2+ SO 2+ O 2→ MgSO 4+ H 2o (5)
SO 3remove Mg (OH) 2+ SO 3→ MgSO 4+ H 2o (6)
Dolomite plaster carbonization Mg (OH) 2ca (OH) 2+ 3CO 2→ Mg (HCO 3) 2+ CaCO 3↓+H 2o (7)
Magnesium basic carbonate transforms 2Mg (HCO 3) 2+ 3Mg (OH) 2→ 4MgCO 3mg (OH) 24H 2o (8)
Gypsum deposition MgSO 4+ CaCL 2+ 2H 2o → CaSO 42H 2o ↓+MgCL 2(9)
Taking lime production technique as example, the present invention takes following technical scheme and step to be achieved:
1. limestone calcination step: by limestone crushing to being applicable to uniform particle size and hard coal according to 5-8: 1 weight ratio is mixed and is packed top, limestone kiln into, under 850-1100 DEG C of calcining temperature, calcine CaO the CO that splits the carbon dioxide off 2, lime obtains lime finished product through pulverizing; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas.In order to improve kiln gas temperature out, for generating provides superiority condition, do not affecting under the normal operation of limestone kiln, can appropriateness adjust hard coal ratio.Its reaction principle is as shown in chemical equation (1).
2. dolomite calcination step: rhombspar is crushed to and is applicable to uniform particle size and hard coal according to 8-10: 1 weight ratio is mixed and packed rhombspar ash furnace top into, and control temperature 850-1100 DEG C, burns till calcined dolomite in powder MgOCaO the CO that splits the carbon dioxide off 2, calcined dolomite in powder obtains calcined dolomite in powder finished product through pulverizing, and part calcined dolomite in powder is for hydrolytic digestion step of the present invention and carbonization heavy magnesium water; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas.In order to adjust kiln gas temperature out, for generating provides superiority condition, do not affecting under the normal operation of limestone kiln, can appropriateness improve hard coal ratio.Its reaction principle is as shown in chemical equation (2).
3. hydrolytic digestion step: by calcined dolomite in powder and water according to 1: 3-8 weight ratio batching, reinforced operation while stirring in digestive shelf, making calcined dolomite in powder hydrolytic digestion is Dolomite milk, digestion water can be used Mg (OH) 2washing of precipitate water.Its reaction principle is as shown in chemical equation (3).
4. calcium magnesium separating step: by Dolomite milk and enough MgCL 2solution carries out calcium magnesium separating reaction, obtains Mg (OH) 2solid phase precipitation thing and CaCL 2the mixture of liquid phase water solution, washing separates the two and obtains respectively Mg (OH) after filtration 2filter cake and CaCL 2solution.Its reaction principle is as shown in chemical equation (4).
5. UTILIZATION OF VESIDUAL HEAT IN step: the flue gas of limestone kiln or limestone kiln group (many bedstones ash furnace) and rhombspar ash furnace or rhombspar ash furnace group (many rhombspar ash furnaces) is introduced to waste heat boiler, utilize fume afterheat to produce steam, steam enters generating set generating, and institute's electric energy that produces is used for power consumption; It is dry that the secondary Lowlevel thermal energy steam that generating set is discharged is transported to respectively the relevant Magnesium Carbonate Light 41-45 of the present invention, light calcium carbonate and magnesium hydroxide; The hot water (80 DEG C of three times, left and right Lowlevel thermal energy hot water) that vapor condensation forms after drying or life heating is provided after return to waste heat boiler or directly send Waste Heat System back to, make full use of system heat energy.
6. SO 2and SO 3remove step: the Mg (OH) that 4. step is obtained 2filter cake water is according to 1: the dilution of 2-8 weight ratio reconciles into slurry, is transported to SO in absorptive unit and flue gas 2and SO 3and O in flue gas 2desulfurization is carried out in reaction, makes SO 2and SO 3transform the MgSO that forms high-dissolvability 4solution.By MgSO 4the Mg (OH) that the part that solution and desulfuration absorbing tower bottom are collected does not react completely 2throw out separates by separation means such as settlement separate, filtering separation, and the supernatant liquor obtaining or filtrate are MgSO 4solution is transported to lower step gypsum deposition process, the unreacted Mg (OH) obtaining 2soup compound or filter cake return to this step and reconcile into slip and reuse.Flue tail gas main component after desulfurization is that carbonic acid gas is sent to carbonation process.Its reaction principle is as shown in chemical equation (5) and (6).
7. gypsum deposition step: the MgSO that 6. step is formed after desulfurization 4solution and step enough CaCL that 4. calcium magnesium separating step obtains 2solution carries out the precipitin reaction of dihydrate gypsum, forms CaSO 42H 2o precipitation and MgCL 2the supernatant liquor of solution.Through CaSO settlement separate or that filter to isolate 42H 2o can directly sell as finished product, can prepare burden as cement mill; Through MgCL settlement separate or that filter to isolate 2solution, turns back to step and 4. separates for calcium magnesium.Its reaction principle is as shown in chemical equation (9).
8. dolomite plaster carburising step: the dolomite plaster that 3. hydrolytic digestion step obtains is sent into spray or multistage spray carbonation top of tower, carry out reverse absorption reaction with the carbon dioxide tail gas that 6. step from bottom to top obtains from top to bottom with dispersing mode, make in calcined dolomite in powder magnesium hydroxide be transformed into the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) and enter liquid phase, make in calcined dolomite in powder calcium hydroxide be transformed into calcium carbonate and enter solid phase, after solid-liquid separation, the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) is delivered to magnesium basic carbonate synthesis procedure, calcium carbonate send drying process for the production of light calcium carbonate.Arrive this, the oxysulfide in flue gas is removed, the carbonic acid gas conversion that is absorbed, and fume afterheat is also fully used, and tail gas can be emptying.Its reaction principle is if chemical equation is as shown in (7).
9. magnesium basic carbonate step of converting: the magnesium bicarbonate solution that 8. step is obtained and step 4. calcium magnesium separate the magnesium hydroxide obtaining and carry out replacement(metathesis)reaction obtain magnesium basic carbonate in reactor.Its reaction principle is if chemical equation is as shown in (8).
10. product drying step: the one, calcium carbonate filter cake is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the calcium carbonate that contains Natural Water, obtains light calcium carbonate product through pulverizing; The 2nd, magnesium basic carbonate is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the magnesium basic carbonate that contains Natural Water, obtains Magnesium Carbonate Light 41-45 product through pulverizing; The 3rd, magnesium hydroxide filtration cakes torrefaction, by the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains to moisture eliminator, by step 4. calcium magnesium separate the magnesium hydroxide filter cake that contains Natural Water obtaining and dehydrated, obtaining magnesium hydroxide products through pulverizing.Calcium sulfate (gypsum) supplies cement mill after natural air drying granulation.
In addition, the step 10. secondary Lowlevel thermal energy steam after product drying operation has become Lowlevel thermal energy hot water three times, and its hot water outlet temperature, between 60-80 DEG C, can be used as life and waiting heating to use, also waste heat boiler water can be directly back to, thermal source can be made full use of.After using as heating, after its heating heat exchange, water is still conducive to waste heat boiler use.
The series of chemical that the invention process process is related, under common flue gas treatment condition, be swift in response thoroughly, less demanding to temperature, concentration, pressure condition, in practice, can be applied in a flexible way according to concrete fume indication and raw material supply condition, to meet, whole process mass transport is smooth and easy, easy to operate is advisable.
The present invention has following remarkable advantage:
Particularly compare with technique with " calcined dolomite in powder is for the method for flue gas desulfurization " desulfurization principle with magnesium oxide or magnesium hydroxide, except efficiently solving flue gas desulfurization, also solved the recycling of carbonic acid gas, particularly ingenious flue gas desulfurization, cogeneration, lime (or coal-fired industry other industry) are produced to produce to organically combine with Magnesium Carbonate Light 41-45 realized satisfactory technique closure.At desulfurization carbon drop simultaneously, heat energy utilization is arrived ultimate attainment; In the time that system material balance is utilized, energy-conservation Magnesium Carbonate Light 41-45 new process of production, consumption reduction, efficient advantage are performed to ultimate attainment; In the time considering with coal-fired flue-gas the difficult problem of environmental protection, outlet new lime production enterprise is represented ultimate attainment.The rhombspar dropping into, Wingdale has become lime product, coal-fired flue-gas and kiln gas have been made into magnesiumcarbonate, calcium carbonate, magnesium hydroxide and gypsum product, the thermal pollution of kiln gas waste heat is transformed into electric energy and has met the most of power consumption of system, the secondary Lowlevel thermal energy steam that generating set is discharged is used for dehumidification system product, three Lowlevel thermal energy hot water after drying products are used for heating and return to generating waste heat boiler, the final tail gas of coal-fired flue-gas has not only taken off sulphur and has also fallen carbon, greatly reducing costs simultaneously, truly solve lime production, magnesiumcarbonate is produced, sweetening process and cogeneration waste gas, waste residue and wastewater zero discharge problem, administer strong technical support is provided for modern environment, for coal-fired industry, enterprise has indicated outlet, for providing foundation taking mine resources advantage as this regional development economy.
Brief description of the drawings
Fig. 1: broad sense coal-fired flue-gas process integration cell formation of the present invention and functional schematic.
Fig. 2: broad sense coal-fired flue-gas joint process schematic diagram of the present invention.
Fig. 3: limestone kiln of the present invention coal-fired flue-gas process integration cell formation and functional schematic.
Fig. 4: limestone kiln of the present invention coal-fired flue-gas joint process schematic diagram.
Fig. 1 shows cell formation and the function distinguishing of process integration of the present invention from common coal-fired flue-gas, its Raw refers to that different industries enters the related raw material of stove, is equivalent to Wingdale in Fig. 3; Finished product and work in-process refer to the product that different industries processes through industrial furnace, are equivalent to the lime in Fig. 3; Industrial furnace refers to the coal-fired industrial furnace of the different purposes of different industries, is equivalent to the ash furnace of calcined limestone in Fig. 3.Form with function with reference to figure 3 brief description of the drawings in detail.
Fig. 2 shows process integration technical process of the present invention from common coal-fired flue-gas, with reference to figure 4 brief description of the drawings.
Fig. 3 marks off the present invention the combination of lime calcining, cogeneration, flue gas desulfurization, four unit of carbonization carbon drop generally according to specialty from lime production industry, show the contact relation of four unit and the function of each unit.From heat energy utilization angle, first be introduced into second unit waste heat boiler generation steam (primary steam) from first module ash furnace waste heat flue gas out and drive generating set (device) to generate electricity, the electricity sending can change into luminous energy, kinetic energy and heat energy various ways; Secondly be used for drying calcium carbonate, magnesiumcarbonate and magnesium hydroxide products from second unit generating set secondary steam (referred to here as secondary Lowlevel thermal energy steam) out by Unit the 4th, heat exchange is rationally used; Secondly be that vapor condensation has been phase-changed into hot water (also can claim Lowlevel thermal energy hot water three times) after Unit the 4th is dry again, hot water circulation turns back to waste heat boiler, certainly, can also heat and wait utilization again returning before waste heat boiler.From desulfurization carbon drop angle, the sulfur-bearing (SO after heat exchange x) carbon containing (CO 2) flue gas or claim that the desulfurization carbon drop process of furnace gas is first to complete desulfurization in Unit the 3rd, then be sent to the 4th unit carbon drop carbonization, and in carbonization process, sulfur-bearing (SO x) furnace gas obtains further desulfurization and forms calcium sulfate in the time that calcium hydroxide exists, and most of carbon containing (CO 2) flue gas is absorbed and becomes Magnesium hydrogen carbonate (heavy magnesium water) and calcium carbonate by dolomite plaster, thereby the desulfurization carbon drop furnace gas tail gas discharging is low-carbon (LC) cleaning.Walk always from material, Wingdale has become lime finished product; Rhombspar has been become respectively Magnesium Carbonate Light 41-45, magnesium hydroxide mid-to high-end product, even if unnecessary calcined dolomite in powder also can be used for all conglomeraties such as power plant desulfurization as finished product with reference to lime; Sulphur in ature of coal is also desulfurized and forms magnesium sulfate and finally formed gypsum low value product and for industries such as cement.As can be seen here, originally flying invention process integration is an enclosed balance system in theory, realize the waste zero release that lime production, generating and magnesium salts are produced, under very applicable current severe environmental protection policy, coal-fired furnace enterprise seeks the Reliable guarantee of existence and outlet, and can produce good economic benefit and social benefit.
Fig. 4 has shown that the present invention is to lime production industry integrated artistic schema, merge lime technology, power generation process with waste heat, sulfur removal technology, carbon drop carbonization and produced procedure merging and the technological step trend of magnesium salts technique, the lively process of specifically having expressed process integration of the present invention, implements the invention provides detailed technology to the public and supports.
Be worth prompting, in the schema representing at Fig. 2, the flowline relating to about the Dryly use second unit secondary Lowlevel thermal energy steam of magnesium hydroxide does not mark, special in this statement.The reason not marking is attractive in appearance and clean and tidy for schema layout.
Embodiment
Now be described in further detail with regard to the present invention by embodiment.
1. limestone calcination step: by limestone crushing to 5-7 centimetre of uniform particle size, mix according to 8: 1 weight ratios with hard coal, pack top, limestone kiln into from thering is the charging opening of sealing function, building stones and hard coal are progressively heated up, along with moving down temperature, the bed of material progressively raises, control the temperature difference of ash furnace top kiln gas temperature and ash furnace middle and lower part calcining zone, control between 850-1100 DEG C of calcining temperature, calcine CaO after the cooling of ash furnace cooling zone from kiln discharge bottom ash furnace; The carbonic acid gas CO decompositing 2discharged by induced draft fan along pipeline from ash furnace top or top with flue gas form with the oxysulfide gas that sulphur in fire coal forms at ash furnace, lime obtains lime finished product through pulverizing; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas.
2. dolomite calcination step: rhombspar is crushed to 5-7 centimetre of uniform particle size, mix according to 7: 1 weight ratios with hard coal, pack top, limestone kiln into from thering is the charging opening of sealing function, building stones and hard coal are progressively heated up, along with moving down temperature, the bed of material progressively raises, control the temperature difference of ash furnace top kiln gas temperature and ash furnace middle and lower part calcining zone more than 200 DEG C, control between 900-1050 DEG C of calcining temperature, burn till calcined dolomite in powder MgOCaO after the cooling of ash furnace cooling zone from kiln discharge bottom ash furnace; CO splits the carbon dioxide off 2discharge along pipeline from ash furnace top or top with flue gas situation with the oxysulfide gas that sulphur in fire coal forms at ash furnace, calcined dolomite in powder obtains calcined dolomite in powder finished product through pulverizing, and part calcined dolomite in powder is for hydrolytic digestion step of the present invention and carbonization heavy magnesium water; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas.
3. hydrolytic digestion step: calcined dolomite in powder and water are prepared burden according to 1: 8 weight ratio, feed in raw material and operate while stirring in digestive shelf, making calcined dolomite in powder hydrolytic digestion is Dolomite milk.
4. calcium magnesium separating step: in reactor under stirring action by Dolomite milk and enough MgCL 2solution carries out calcium magnesium separating reaction, obtains Mg (OH) 2solid phase precipitation thing and CaCL 2the mixture of liquid phase water solution, separates the two through press filtration washing and obtains respectively Mg (OH) 2filter cake and CaCL 2solution.
5. UTILIZATION OF VESIDUAL HEAT IN step: the flue gas of limestone kiln and rhombspar ash furnace is merged, introduce waste heat boiler, utilize fume afterheat to produce steam, steam enters generating set generating, and institute's electric energy that produces is used for power consumption; It is dry that the secondary Lowlevel thermal energy steam that generating set is discharged is transported to respectively the relevant Magnesium Carbonate Light 41-45 of the present invention, light calcium carbonate and magnesium hydroxide; The hot water that vapor condensation forms after drying returns to Waste Heat System for cogeneration and produces steam.
6. SO 2and SO 3remove step: the Mg (OH) that 4. step is obtained 2filter cake water reconciles into slurry according to weight ratio dilution in 1: 8, is transported to SO in absorptive unit and flue gas 2and SO 3and O in flue gas 2desulfurization is carried out in reaction, makes SO 2and SO 3transform the MgSO that forms high-dissolvability 4solution.By MgSO 4the Mg (OH) that the part that solution and desulfuration absorbing tower bottom are collected does not react completely 2throw out separates by separation means such as settlement separate, filtering separation, and the supernatant liquor obtaining or filtrate are MgSO 4solution is transported to lower step gypsum deposition process, the unreacted Mg (OH) obtaining 2soup compound returns to this step and reconciles into slip and reuses.Flue tail gas main component after desulfurization is that carbonic acid gas is sent to carbonation process.
7. gypsum deposition step: the MgSO that 6. step is formed after desulfurization 4solution and step enough CaCL that 4. calcium magnesium separating step obtains 2solution carries out the precipitin reaction of dihydrate gypsum, forms CaSO 42H 2o precipitation and MgCL 2the supernatant liquor of solution.Through settlement separate go out CaSO 42H 20 can be directly sells as finished product, through settlement separate go out MgCL 2solution, turns back to step and 4. separates for calcium magnesium.
8. dolomite plaster carburising step: the dolomite plaster that 3. hydrolytic digestion step obtains is pumped into spray carbonating tower top, with dispersing mode from top to bottom with white lower and on the carbon dioxide tail gas that 6. obtains of step carry out reverse absorption reaction, make in calcined dolomite in powder magnesium hydroxide be transformed into the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) and enter liquid phase, make in calcined dolomite in powder calcium hydroxide be transformed into calcium carbonate and enter solid phase, solid-liquid is after press filtration separates, the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) is delivered to magnesium basic carbonate synthesis procedure, calcium carbonate send drying process for the production of light calcium carbonate, tail gas is emptying.
9. magnesium basic carbonate step of converting: the magnesium bicarbonate solution that 8. step is obtained and step 4. calcium magnesium separate the magnesium hydroxide obtaining mix and blend in reactor and carry out replacement(metathesis)reaction and obtain magnesium basic carbonate.
10. product drying step: the one, calcium carbonate filter cake is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the calcium carbonate that contains Natural Water, obtains light calcium carbonate product through pulverizing; The 2nd, magnesium basic carbonate is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the magnesium basic carbonate that contains Natural Water, obtains Magnesium Carbonate Light 41-45 product through pulverizing; The 3rd, magnesium hydroxide filtration cakes torrefaction, by the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains to moisture eliminator, by step 4. calcium magnesium separate the magnesium hydroxide filter cake that contains Natural Water obtaining and dehydrated, obtaining magnesium hydroxide products through pulverizing.
In addition, the step 10. secondary Lowlevel thermal energy steam after product drying operation has become Lowlevel thermal energy hot water three times, and its hot water outlet temperature, between 60-80 DEG C, can be used as life and waiting heating to use, also waste heat boiler water can be directly back to, thermal source can be made full use of.After using as heating, after its heating heat exchange, water is still conducive to waste heat boiler use.

Claims (6)

1. calcined dolomite in powder is produced a technique for magnesiumcarbonate series product for the generating of flue gas desulfurization carbon drop, comprises four unit:
First module is that flue gas produces and calcined dolomite in powder is produced part (abbreviation lime calcining): the task of this unit is burnt and in ash furnace, mixed hard coal, rhombspar acquisition calcined dolomite in powder and sulfur-containing oxide SO by coal-fired industrial furnace xwith carbonic acid gas CO 2furnace gas or flue gas and coal-fired industrial furnace output finished product or work in-process; Coal-fired industrial furnace finished product or work in-process are for selling or subsequent technique processing, the calcined dolomite in powder part that ash furnace obtains is sent to the 3rd unit (flue gas desulfurization) desulfurization, part is sent to Unit the 4th (carbonization carbon drop) carbonization, and rest part can commodity selling; Furnace gas send second unit (cogeneration) for waste heat boiler or Waste Heat Generation and produces steam (also claiming secondary Lowlevel thermal energy steam);
Second unit is that cogeneration utilizes part: the effect of this part is absorb first module waste heat furnace gas and quote the 4th unit water of condensation (three Lowlevel thermal energy hot water) and carry out UTILIZATION OF VESIDUAL HEAT IN, the electric energy of output needs for system dynamic, the steam (secondary Lowlevel thermal energy steam) producing is for the 4th unit drying products, and the furnace gas of discharge send Unit the 3rd to carry out desulfurization;
Unit the 3rd is flue gas desulfurization part: the task one of this part is first module calcined dolomite in powder magnesium chloride solution to be implemented to calcium magnesium separate, and isolated magnesium hydroxide is sized mixing and removed the oxysulfide that second unit sends here in flue gas and form magnesium sulfate doctor solution; The 2nd, with isolated calcium chloride solution sulfate precipitate magnesium solution acquisition terra alba; Three are to provide magnesium hydrate precipitate directly reacts with heavy magnesium water and generates magnesiumcarbonate (magnesium basic carbonate) precipitation for Unit the 4th; The 4th, send the 4th unit drying and crushing preparing magnesium hydroxide product by unnecessary magnesium hydroxide;
Unit the 4th is carbon drop carbonization part, also be the part of producing of Magnesium Carbonate Light 41-45, calcium carbonate: the effect one of this part is to send first module here calcined dolomite in powder hydrolytic digestion to become dolomite plaster, carry out carbonization with the furnace gas after the 3rd unit desulfurization, in dolomite plaster, in magnesium hydroxide absorption furnace gas, carbon dioxide conversion is that heavy magnesium water enters liquid phase, calcium hydroxide becomes calcium carbonate and enters solid phase, and it is emptying that furnace gas becomes Purge gas; The 2nd, by heavy magnesium water and calcium carbonate solid-liquid separation, the secondary Lowlevel thermal energy steam drying calcium carbonate producing with second unit also obtains light calcium carbonate product through pulverizing; The 3rd, complete magnesium basic carbonate conversion reaction, Part III magnesium hydrate precipitate directly to be reacted with heavy magnesium water and generates magnesium basic carbonate, the secondary Lowlevel thermal energy steam drying producing with second unit obtains Magnesium Carbonate Light 41-45 product through pulverizing.
2. calcined dolomite in powder according to claim 1 is produced the technique of magnesiumcarbonate series product for the generating of flue gas desulfurization carbon drop, and its technological process is characterised in that:
First in first module, implement dolomite calcination and coal-burned industrial boiler flue gas and produce, calcine according to applicable ratio input dolomite calcination kiln (ash furnace) with rhombspar taking hard coal as fuel, make rhombspar (MgCO 3.CaCO 3) being converted into calcined dolomite in powder (Mgo.CaO), the feedstock conversion that coal-burned industrial boiler adds is corresponding finished product or work in-process; Meanwhile, produce the comparatively high temps flue gas that contains oxysulfide and carbonic acid gas composition;
At second unit, first module furnace gas is introduced to waste heat boiler and implement fume afterheat generating, institute's generated energy is for system dynamic, and after generating, steam (secondary Lowlevel thermal energy steam) is transported to Unit the 4th dry magnesiumcarbonate, calcium carbonate or magnesium hydroxide by pipeline; The overheated flue gas that changes flowing out from waste heat boiler directly send Part III desulfurization; Waste heat boiler water can adopt the water of condensation (three Lowlevel thermal energy hot water) forming after the 4th unit drying products;
In Unit the 3rd, implement desulfurization and reclaim gypsum: first by calcined dolomite in powder hydrolytic digestion and refine as Dolomite milk, with MgCL 2solution carries out calcium magnesium separating reaction, makes the Ca (OH) in calcined dolomite in powder Ruzhong 2be transformed into the CaCL that solubleness is high 2liquid enters liquid phase, makes the Mg (OH) in calcined dolomite in powder Ruzhong 2enter solid phase, washing has realized the separation of calcium magnesium after filtration, by isolated part Mg (OH) 2filter cake dilution reconciles into slurry, is transported to SO in absorptive unit and flue gas 2and SO 3and O 2desulfurization is carried out in reaction, makes SO 2and SO 3transform and form MgSO 1the aqueous solution, reaches desulfurization object; The MgSO that desulfurization is formed 4the CaCL that solution obtains in separating with calcium magnesium 2liquid carries out gypsum deposition reaction, forms CaSO42H 2o precipitation and MgCL 2solution, after sedimentation or filtering separation, solid is CaSO42H 2o (gypsum), and MgCL 2solution and Dolomite milk re-start calcium magnesium separating reaction; By isolated another part Mg (OH) 2filter cake is transported to Unit the 4th and reacts generation basic carbonate magnesium precipitate with heavy magnesium water; By isolated redundance Mg (OH) 2filter cake send the 4th unit second unit steam drying and pulverizes and can obtain magnesium hydroxide products;
Unit the 4th, implementing Magnesium Carbonate Light 41-45, light calcium carbonate and magnesium hydroxide produces: the furnace gas taking carbonic acid gas as master by Unit the 3rd after desulfurization, do reverse carbonization with dolomite plaster, carbonic acid gas enters from carbonating tower bottom, dolomite plaster from top spray or spraying and, fully contact with carbonic acid gas, make magnesium hydroxide enter liquid phase with Magnesium hydrogen carbonate (heavy magnesium water) form, calcium hydroxide enters solid phase with calcium carbonate form and implements to separate by filtration; The 3rd cell mesh magnesium hydrate precipitate is directly reacted with isolated heavy magnesium water and generates magnesium basic carbonate, filtering separation obtains magnesium basic carbonate filter cake, send moisture eliminator by magnesium basic carbonate, the secondary Lowlevel thermal energy steam that passes through generating with second section does thermal source, completes magnesiumcarbonate and is dried and passes through pulverizing acquisition Magnesium Carbonate Light 41-45 finished product; Send moisture eliminator by the calcium carbonate filter cake filtering to isolate, the secondary Lowlevel thermal energy steam that passes through generating with second section does thermal source, completes calcium carbonate and is dried and passes through pulverizing acquisition light calcium carbonate finished product; Magnesium hydrate precipitate unnecessary the 3rd cell mesh is directly done to thermal source with second section through the secondary Lowlevel thermal energy steam of generating, complete to be dried and to pass through to pulverize obtaining magnesium hydroxide finished product.
3. calcined dolomite in powder according to claim 1 is produced the technique of magnesiumcarbonate series product for the generating of flue gas desulfurization carbon drop, and described coal-fired industrial furnace is limestone kiln, it is characterized in that comprising on the whole four unit:
First module is that lime and calcined dolomite in powder are produced part (abbreviation lime calcining): the task of this unit is by mix hard coal, Wingdale in limestone kiln (ash furnace), in rhombspar ash furnace (ash furnace), mix hard coal, rhombspar, after calcining, obtain respectively lime, calcined dolomite in powder and sulfur-containing oxide SO xwith carbonic acid gas CO 2furnace gas or flue gas; Lime can form commodity selling; Calcined dolomite in powder part is sent to the 3rd unit (flue gas desulfurization) desulfurization, and part is sent to Unit the 4th (carbonization carbon drop) carbonization, and rest part can commodity selling; Furnace gas send second unit (cogeneration) for waste heat boiler or Waste Heat Generation and produces steam (also claiming secondary Lowlevel thermal energy steam);
Second unit is that cogeneration utilizes part: the effect of this part is absorb first module waste heat furnace gas and quote the 4th unit water of condensation (three Lowlevel thermal energy hot water) and carry out UTILIZATION OF VESIDUAL HEAT IN, the electric energy of output needs for system dynamic, the steam (secondary Lowlevel thermal energy steam) producing is for the 4th unit drying products, and the furnace gas of discharge send Unit the 3rd to carry out desulfurization;
Unit the 3rd is flue gas desulfurization part: the task one of this part is first module calcined dolomite in powder magnesium chloride solution to be implemented to calcium magnesium separate, and isolated magnesium hydroxide is sized mixing and removed the oxysulfide that second unit sends here in flue gas and form magnesium sulfate doctor solution; The 2nd, with isolated calcium chloride solution sulfate precipitate magnesium solution acquisition terra alba; Three are to provide magnesium hydrate precipitate directly reacts with heavy magnesium water and generates magnesiumcarbonate (magnesium basic carbonate) precipitation for Unit the 4th; The 4th, by unnecessary magnesium hydroxide drying and crushing preparing magnesium hydroxide product;
Unit the 4th is carbon drop carbonization part, also be the part of producing of Magnesium Carbonate Light 41-45, calcium carbonate: the effect one of this part is to send first module here calcined dolomite in powder hydrolytic digestion to become dolomite plaster, carry out carbonization with the furnace gas after the 3rd unit desulfurization, in dolomite plaster, in magnesium hydroxide absorption furnace gas, carbon dioxide conversion is that heavy magnesium water (Magnesium hydrogen carbonate) enters liquid phase, calcium hydroxide becomes calcium carbonate and enters solid phase, and it is emptying that furnace gas becomes Purge gas; The 2nd, by heavy magnesium water and calcium carbonate solid-liquid separation, the secondary Lowlevel thermal energy steam drying calcium carbonate producing with second unit also obtains light calcium carbonate product through pulverizing; The 3rd, complete magnesium basic carbonate conversion reaction, the 3rd unit magnesium hydrate precipitate directly to be reacted with heavy magnesium water and generates magnesium basic carbonate, the secondary Lowlevel thermal energy steam drying producing with second unit obtains Magnesium Carbonate Light 41-45 product through pulverizing.
4. calcined dolomite in powder according to claim 3 is produced the technique of magnesiumcarbonate series product for the generating of flue gas desulfurization carbon drop, and its technological process is characterised in that:
First in first module, implement the calcining of rhombspar and Wingdale: taking hard coal as fuel with rhombspar or Wingdale drops into respectively dolomite calcination kiln according to applicable ratio or lime calcining kiln is calcined, make rhombspar (MgCO 3.CaCO 3) be converted into calcined dolomite in powder (Mgo.CaO), Wingdale (CaCO 3) be converted into lime (CaO); Meanwhile, produce the comparatively high temps flue gas that contains oxysulfide and carbonic acid gas composition;
At second unit, first module furnace gas is introduced to waste heat boiler and implement fume afterheat generating: institute's generated energy is for system dynamic, and after generating, steam (secondary Lowlevel thermal energy steam) is transported to Unit the 4th dry magnesiumcarbonate, calcium carbonate or magnesium hydroxide by pipeline; The overheated flue gas that changes flowing out from waste heat boiler directly send Part III desulfurization; Waste heat boiler water can adopt the water of condensation (three Lowlevel thermal energy hot water) forming after the 4th unit drying products;
In Unit the 3rd, implement desulfurization and reclaim gypsum: first by calcined dolomite in powder hydrolytic digestion and refine as Dolomite milk, with MgCL 2solution carries out calcium magnesium separating reaction, makes the Ca (OH) in calcined dolomite in powder Ruzhong 2be transformed into the CaCL that solubleness is high 2liquid enters liquid phase, makes the Mg (OH) in calcined dolomite in powder Ruzhong 2enter solid phase, washing has realized the separation of calcium magnesium after filtration, by isolated part Mg (OH) 2filter cake dilution reconciles into slurry, is transported to SO in absorptive unit and flue gas 2and SO 3and O 2desulfurization is carried out in reaction, makes SO 2and SO 3transform and form MgSO 4the aqueous solution, reaches desulfurization object; The MgSO that desulfurization is formed 4the CaCL that solution obtains in separating with calcium magnesium 2liquid carries out gypsum deposition reaction, forms CaSO42H 2o precipitation and MgCL 2solution, after sedimentation or filtering separation, solid is CaSO42H 2o (gypsum), and MgCL 2solution and Dolomite milk re-start calcium magnesium separating reaction; By isolated another part Mg (OH) 2filter cake is transported to Unit the 4th and reacts generation basic carbonate magnesium precipitate with heavy magnesium water; By isolated redundance Mg (OH) 2filter cake send the 4th unit second unit steam drying and pulverizes and can obtain magnesium hydroxide products;
Unit the 4th, implementing Magnesium Carbonate Light 41-45, light calcium carbonate and magnesium hydroxide produces: the furnace gas taking carbonic acid gas as master by Unit the 3rd after desulfurization, do reverse carbonization with dolomite plaster, carbonic acid gas enters from carbonating tower bottom, dolomite plaster from top spray or spraying and, fully contact with carbonic acid gas, make magnesium hydroxide enter liquid phase with Magnesium hydrogen carbonate (heavy magnesium water) form, calcium hydroxide enters solid phase with calcium carbonate form and implements to separate by filtration; The 3rd cell mesh magnesium hydrate precipitate is directly reacted with isolated heavy magnesium water and generates magnesium basic carbonate, filtering separation obtains magnesium basic carbonate filter cake, send moisture eliminator by magnesium basic carbonate, the secondary Lowlevel thermal energy steam that passes through generating with second unit does thermal source, completes magnesiumcarbonate and is dried and passes through pulverizing acquisition Magnesium Carbonate Light 41-45 finished product; Send moisture eliminator by the calcium carbonate filter cake filtering to isolate, the secondary Lowlevel thermal energy steam that passes through generating with second unit does thermal source, completes calcium carbonate and is dried and passes through pulverizing acquisition light calcium carbonate finished product; Magnesium hydrate precipitate unnecessary the 3rd cell mesh is directly done to thermal source with second unit through the secondary Lowlevel thermal energy steam of generating, complete to be dried and to pass through to pulverize obtaining magnesium hydroxide finished product.
5. the technique of producing magnesiumcarbonate series product according to the calcined dolomite in powder described in claim 3 or 4 for the generating of flue gas desulfurization carbon drop, its technical scheme and steps characteristic are:
1. limestone calcination step: by limestone crushing to being applicable to uniform particle size and hard coal according to 5-8: 1 weight ratio is mixed and is packed top, limestone kiln into, under 850-1100 DEG C of calcining temperature, calcine CaO the CO that splits the carbon dioxide off 2, lime obtains lime finished product through pulverizing; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas;
2. dolomite calcination step: rhombspar is crushed to and is applicable to uniform particle size and hard coal according to 8-10: 1 weight ratio is mixed and packed rhombspar ash furnace top into, and control temperature 850-1100 DEG C, burns till calcined dolomite in powder MgOCaO the CO that splits the carbon dioxide off 2, calcined dolomite in powder obtains calcined dolomite in powder finished product through pulverizing, and part calcined dolomite in powder is for hydrolytic digestion step of the present invention and carbonization heavy magnesium water; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas;
3. hydrolytic digestion step: by calcined dolomite in powder and water according to 1: 3-8 weight ratio batching, reinforced operation while stirring in digestive shelf, making calcined dolomite in powder hydrolytic digestion is Dolomite milk, digestion water can be used Mg (OH) 2washing of precipitate water;
4. calcium magnesium separating step: by Dolomite milk and enough MgCL 2solution carries out calcium magnesium separating reaction, obtains Mg (OH) 2solid phase precipitation thing and CaCL 2the mixture of liquid phase water solution, washing separates the two and obtains respectively Mg (OH) after filtration 2filter cake and CaCL 2solution;
5. UTILIZATION OF VESIDUAL HEAT IN step: the flue gas of limestone kiln or limestone kiln group (many bedstones ash furnace) and rhombspar ash furnace or rhombspar ash furnace group (many rhombspar ash furnaces) is introduced to waste heat boiler, utilize fume afterheat to produce steam, steam enters generating set generating, and institute's electric energy that produces is used for power consumption; It is dry that the secondary Lowlevel thermal energy steam that generating set is discharged is transported to respectively the relevant Magnesium Carbonate Light 41-45 of the present invention, light calcium carbonate and magnesium hydroxide; The hot water (three Lowlevel thermal energy hot water) that vapor condensation forms after drying or life heating is provided after return to waste heat boiler or directly send Waste Heat System back to, make full use of system heat energy;
6. SO 2and SO 3remove step: the Mg (OH) that 4. step is obtained 2filter cake water is according to 1: the dilution of 2-8 weight ratio reconciles into slurry, is transported to SO in absorptive unit and flue gas 2and SO 3and O in flue gas 2desulfurization is carried out in reaction, makes SO 2and SO 3transform the MgSO that forms high-dissolvability 4solution; By MgSO 4the Mg (OH) that the part that solution and desulfuration absorbing tower bottom are collected does not react completely 2throw out separates by separation means such as settlement separate, filtering separation, and the supernatant liquor obtaining or filtrate are MgSO 4solution is transported to lower step gypsum deposition process, the unreacted Mg (OH) obtaining 2soup compound or filter cake return to this step and reconcile into slip and reuse; Flue tail gas main component after desulfurization is that carbonic acid gas is sent to carbonation process;
7. gypsum deposition step: the MgSO that 6. step is formed after desulfurization 4solution and step enough CaCL that 4. calcium magnesium separating step obtains 2solution carries out the precipitin reaction of dihydrate gypsum, forms CaSO 42H 2o precipitation and MgCL 2the supernatant liquor of solution; Through CaSO settlement separate or that filter to isolate 42H 2o can directly sell as finished product, can prepare burden as cement mill; Through MgCL settlement separate or that filter to isolate 2solution, turns back to step and 4. separates for calcium magnesium;
8. dolomite plaster carburising step: the dolomite plaster that 3. hydrolytic digestion step obtains is sent into spray or multistage spray carbonation top of tower, with dispersing mode from top to bottom with white lower and on the carbon dioxide tail gas that 6. obtains of step carry out reverse absorption reaction, make in calcined dolomite in powder magnesium hydroxide be transformed into the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) and enter liquid phase, make in calcined dolomite in powder calcium hydroxide be transformed into calcium carbonate and enter solid phase, after solid-liquid separation, the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) is delivered to magnesium basic carbonate synthesis procedure, calcium carbonate send drying process for the production of light calcium carbonate, tail gas is emptying,
9. magnesium basic carbonate step of converting: the magnesium bicarbonate solution that 8. step is obtained and step 4. calcium magnesium separate the magnesium hydroxide obtaining and carry out replacement(metathesis)reaction obtain magnesium basic carbonate in reactor;
10. product drying step: the one, calcium carbonate filter cake is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the calcium carbonate that contains Natural Water, obtains light calcium carbonate product through pulverizing; The 2nd, magnesium basic carbonate is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the magnesium basic carbonate that contains Natural Water, obtains Magnesium Carbonate Light 41-45 product through pulverizing; The 3rd, magnesium hydroxide filtration cakes torrefaction, by the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains to moisture eliminator, by step 4. calcium magnesium separate the magnesium hydroxide filter cake that contains Natural Water obtaining and dehydrated, obtaining magnesium hydroxide products through pulverizing.
6. calcined dolomite in powder according to claim 5 is produced the technique of magnesiumcarbonate series product for the generating of flue gas desulfurization carbon drop, and its technical scheme and step journey are characterised in that:
1. limestone calcination step: by limestone crushing to 5-7 centimetre of uniform particle size, mix according to 8: 1 weight ratios with hard coal, pack top, limestone kiln into from thering is the charging opening of sealing function, building stones and hard coal are progressively heated up, along with moving down temperature, the bed of material progressively raises, control the temperature difference of ash furnace top kiln gas temperature and ash furnace middle and lower part calcining zone, control between 850-1100 DEG C of calcining temperature, calcine CaO after the cooling of ash furnace cooling zone from kiln discharge bottom ash furnace; The carbonic acid gas CO decompositing 2discharged by induced draft fan along pipeline from ash furnace top or top with flue gas form with the oxysulfide gas that sulphur in fire coal forms at ash furnace, lime obtains lime finished product through pulverizing; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas;
2. dolomite calcination step: rhombspar is crushed to 5-7 centimetre of uniform particle size, mix according to 7: 1 weight ratios with hard coal, pack top, limestone kiln into from thering is the charging opening of sealing function, building stones and hard coal are progressively heated up, along with moving down temperature, the bed of material progressively raises, control the temperature difference of ash furnace top kiln gas temperature and ash furnace middle and lower part calcining zone more than 200 DEG C, control between 900-1050 DEG C of calcining temperature, burn till calcined dolomite in powder MgOCaO after the cooling of ash furnace cooling zone from kiln discharge bottom ash furnace; CO splits the carbon dioxide off 2discharge along pipeline from ash furnace top or top with flue gas situation with the oxysulfide gas that sulphur in fire coal forms at ash furnace, calcined dolomite in powder obtains calcined dolomite in powder finished product through pulverizing, and part calcined dolomite in powder is for hydrolytic digestion step of the present invention and carbonization heavy magnesium water; Carbonic acid gas enters cogeneration, dust-removal and desulfurizing, carbonization, emptying successively with flue gas;
3. hydrolytic digestion step: calcined dolomite in powder and water are prepared burden according to 1: 8 weight ratio, feed in raw material and operate while stirring in digestive shelf, making calcined dolomite in powder hydrolytic digestion is Dolomite milk;
4. calcium magnesium separating step: in reactor under stirring action by Dolomite milk and enough MgCL 2solution carries out calcium magnesium separating reaction, obtains Mg (OH) 2solid phase precipitation thing and CaCL 2the mixture of liquid phase water solution, separates the two through press filtration washing and obtains respectively Mg (OH) 2filter cake and CaCL 2solution;
5. UTILIZATION OF VESIDUAL HEAT IN step: the flue gas of limestone kiln and rhombspar ash furnace is merged, introduce waste heat boiler, utilize fume afterheat to produce steam, steam enters generating set generating, and institute's electric energy that produces is used for power consumption; It is dry that the secondary Lowlevel thermal energy steam that generating set is discharged is transported to respectively the relevant Magnesium Carbonate Light 41-45 of the present invention, light calcium carbonate and magnesium hydroxide; The hot water that vapor condensation forms after drying returns to Waste Heat System for cogeneration and produces steam;
6. SO 2and SO 3remove step: the Mg (OH) that 4. step is obtained 2filter cake water reconciles into slurry according to weight ratio dilution in 1: 8, is transported to SO in absorptive unit and flue gas 2and SO 3and O in flue gas 2desulfurization is carried out in reaction, makes SO 2and SO 3transform the MgSO that forms high-dissolvability 4solution; By MgSO 4the Mg (OH) that the part that solution and desulfuration absorbing tower bottom are collected does not react completely 2throw out separates by separation means such as settlement separate, filtering separation, and the supernatant liquor obtaining or filtrate are MgSO 4solution is transported to lower step gypsum deposition process, the unreacted Mg (OH) obtaining 2soup compound returns to this step and reconciles into slip and reuses; Flue tail gas main component after desulfurization is that carbonic acid gas is sent to carbonation process;
7. gypsum deposition step: the MgSO that 6. step is formed after desulfurization 4solution and step enough CaCL that 4. calcium magnesium separating step obtains 2solution carries out the precipitin reaction of dihydrate gypsum, forms CaSO 42H 2o precipitation and MgCL 2the supernatant liquor of solution; Through settlement separate go out CaSO 42H 2o can be directly sells as finished product, through settlement separate go out MgCL 2solution, turns back to step and 4. separates for calcium magnesium;
8. dolomite plaster carburising step: the dolomite plaster that 3. hydrolytic digestion step obtains is pumped into spray carbonating tower top, with dispersing mode in vain upper and under lower and white and on the carbon dioxide tail gas that 6. obtains of step carry out reverse absorption reaction, make in calcined dolomite in powder magnesium hydroxide be transformed into the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) and enter liquid phase, make in calcined dolomite in powder calcium hydroxide be transformed into calcium carbonate and enter solid phase, solid-liquid is after press filtration separates, the Magnesium hydrogen carbonate aqueous solution (heavy magnesium water) is delivered to magnesium basic carbonate synthesis procedure, calcium carbonate send drying process for the production of light calcium carbonate, tail gas is emptying,
9. magnesium basic carbonate step of converting: the magnesium bicarbonate solution that 8. step is obtained and step 4. calcium magnesium separate the magnesium hydroxide obtaining mix and blend in reactor and carry out replacement(metathesis)reaction and obtain magnesium basic carbonate;
10. product drying step: the one, calcium carbonate filter cake is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the calcium carbonate that contains Natural Water, obtains light calcium carbonate product through pulverizing; The 2nd, magnesium basic carbonate is dry, and the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains, to moisture eliminator, is dehydrated the magnesium basic carbonate that contains Natural Water, obtains Magnesium Carbonate Light 41-45 product through pulverizing; The 3rd, magnesium hydroxide filtration cakes torrefaction, by the step secondary Lowlevel thermal energy delivery of steam that 5. UTILIZATION OF VESIDUAL HEAT IN step obtains to moisture eliminator, by step 4. calcium magnesium separate the magnesium hydroxide filter cake that contains Natural Water obtaining and dehydrated, obtaining magnesium hydroxide products through pulverizing.
CN201410112442.5A 2014-03-22 2014-03-22 Process of producing magnesium carbonate-series products by dolomite lime smoke gas desulfurization carbon-drop power generation Pending CN103922369A (en)

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CN105753021A (en) * 2016-05-10 2016-07-13 邢台县旭东工贸有限责任公司 Production system of desulfurization product magnesium sulfate regenerative desulfurization adsorbent magnesium hydroxide
CN108751235A (en) * 2018-08-09 2018-11-06 苏州市泽镁新材料科技有限公司 A kind of preparation method of nanoscale high purity light magnesium carbonate
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Application publication date: 20140716