CN106477611B - A kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions - Google Patents
A kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions Download PDFInfo
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- CN106477611B CN106477611B CN201610901261.XA CN201610901261A CN106477611B CN 106477611 B CN106477611 B CN 106477611B CN 201610901261 A CN201610901261 A CN 201610901261A CN 106477611 B CN106477611 B CN 106477611B
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- carbide slag
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 99
- 239000002893 slag Substances 0.000 title claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 title claims description 17
- 239000007787 solid Substances 0.000 title claims description 16
- 229940088417 precipitated calcium carbonate Drugs 0.000 title claims description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 48
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 42
- 239000012535 impurity Substances 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000005255 carburizing Methods 0.000 claims abstract description 10
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 59
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 22
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 16
- 239000000920 calcium hydroxide Substances 0.000 claims description 15
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 15
- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 229910044991 metal oxide Inorganic materials 0.000 claims description 9
- 150000004706 metal oxides Chemical class 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000005119 centrifugation Methods 0.000 claims description 5
- 238000003763 carbonization Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 21
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 12
- 239000000463 material Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 239000004408 titanium dioxide Substances 0.000 description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 238000009955 starching Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- LLPOLZWFYMWNKH-CMKMFDCUSA-N hydrocodone Chemical compound C([C@H]1[C@H](N(CC[C@@]112)C)C3)CC(=O)[C@@H]1OC1=C2C3=CC=C1OC LLPOLZWFYMWNKH-CMKMFDCUSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 239000005997 Calcium carbide Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 up to 92 Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/184—Preparation of calcium carbonate by carbonation of solutions based on non-aqueous solvents
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a kind of techniques using carbide slag and flue gas production fine calcium carbonate, include the following steps：（1）Flue gas washes dedusting；（2）Carbide slag pre-processes；（3）Carbide slag classification removal of impurities and concentration；（4）Carbide slag carries out carburizing reagent with flue gas in carbonators；（5）Calcium carbonate made from reaction obtains fine calcium carbonate product after concentrate, drying, screening.This method production cost is low, equipment is simple, obtains product cut size is small, narrowly distributing, is a kind of production line for being easy to industrialization promotion.
Description
Technical field
The invention belongs to inorganic chemical industry field of material preparation, are related to a kind of technical method for preparing calcium carbonate, especially sharp
The method for preparing precipitated calcium carbonate with useless carbide slag and flue solid/liquid/gas reactions.
Background technology
Carbide slag is the waste residue generated after calcium carbide hydrolysis during industrial production polyvinyl chloride product, and main component is hydrogen-oxygen
Change calcium.Carbide slag alkalinity is very strong, if directly not only land occupation resource, alkali-affected soil are also right for air storage or burial processing
Air, underground water etc. cause secondary pollution.Find a kind of simple, efficient, at low cost, easy to spread carbide slag comprehensive utilization way
Diameter, it is extremely urgent.
Flue gas refers to coal generated gas when fossil fuels burn, and main component is nitrogen, carbon dioxide, oxygen
Gas, carbon monoxide and micro sulfur dioxide etc..If carbon dioxide recovery therein and being used can be not only avoided
Direct emission is seriously polluted caused by air, and realizing turns waste into wealth, and cycle development also benign for enterprise provides one
Practical way.
At present, China prepares precipitated calcium carbonate using carbide slag and is mainly the following mode：
(1) carbide slag calcining carbonizatin method：
By carbide slag it is purified, filtering, calcining obtained by calcium oxide powder add water digestion be made into certain density hydroxide
Calcium slurries are passed through carbon dioxide to it and carry out carburizing reagent and obtain precipitation of calcium carbonate.The reaction process feasible route, but react
Energy consumption is too high, and calcining cannot remove other metal oxide impurities, and certain influence is generated on the quality of subsequent product.
(2) ammonium chloride removal of impurities carbonizatin method：
Into pretreated carbide slag, the progress of the ammonium chloride solution of addition a certain concentration and excess is with slurry makes its molten
Solution, reaction are filtered to remove after impurity and are passed through carbon dioxide and obtain precipitation of calcium carbonate.The process route meeting a large amount of ammonias of by-product, such as
It does not deal carefully with, secondary pollution will certainly be caused to environment.
(3) carbanion reaction method：
It proposes carbide slag being ground into after coarse powder in CN102115120 to be dissolved with hydrochloric acid, into the filtrate after reaction
Excessive carbon acid solution is added in be reacted and calcium carbonate product is made.Because also containing other metal oxides in carbide slag, therefore
The method cannot effectively detach impurity and calcium carbonate product purity is made to be affected with whiteness.
Carbon dioxide content in process above route for carbonization is controlled more than 20%, therefore a kind of energy is needed to utilize
The process of low concentration of carbon dioxide flue gas.
Invention content
It is an object of the invention in order to overcome above method high energy consumption, Carbonate Particle Size distribution wide and not easily-controllable
System, limitation low concentration of carbon dioxide exhaust gas use the shortcomings of, provide and a kind of prepare lightweight using carbide slag and flue solid/liquid/gas reactions
The method of calcium carbonate, CO 2 waste gas of the concentration less than 15% can also be utilized in flue gas, and it is high, white to obtain product purity
Spend, grain size is small and is evenly distributed, the present invention not only by solid waste administer and reduction of greenhouse gas discharge combines, realize
The treatment of wastes with processes of wastes against one another also provides an economy, easy easily popularization for the precipitated calcium carbonate that industrialized production grain size is small, particle diameter distribution is narrow
Process route.
In order to realize the above method, technical scheme is as follows：
Flue gas is washed dedusting and is cooled to after certain temperature is sent to carbonators through wind turbine pressurization, and carbide slag slurries are preprocessed
And be classified and clean and be sent to after concentrating carbonators and flue gas generation carburizing reagent, calcium carbonate made from reaction passes through concentrate, does
Fine calcium carbonate product is obtained after dry, screening.
A kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions, step are：
(1) flue gas of the volumn concentration of carbon dioxide not less than 5% is sent to water scrubber, flue gas in tower with spraying
Leaching and lower water droplet counter current contacting removes the impurity to suspend, exchange heat the gas for being cooled to and carbonators being sent to after 20-25 DEG C after pressurization
Distributor, flue gas feed rate are 2~8cm/s.
(2) carbide slag slurries are heated to 120 DEG C~150 DEG C to remove wherein dissolved gas and volatile impurity.
(3) carbide slag slurries after heating, which enter, to be thickened tank and adjusts to calcium hydroxide mass percentage as after 5%~10%
Primary vibration into 60~100 mesh sieves, and the secondary vibration sieve of 140~200 mesh is then entered back into after cyclone hydraulic separators, out
The buffered tank of slurries and underflow pump after be then sent through cyclone hydraulic separators and be centrifuged, rotary filter press outlet carbide slag slurries fluid wave
U.S. degree is 10~13 ° of B é, then by the third level vibrating screen of 250 mesh be sent into storage thicken tank carry out being concentrated into hydroxide it is calcareous
It is 12%~18% to measure percentage composition, and the carbide slag slurries after concentration are sent to carbonators.
(4) carbide slag slurries enter carbonators from tower top spray and the lower partition board by sandwich tape sieve pore become drop, sieve pore
Size is 6~10mm, and percent opening is 3.5%~5%, and flue gas enters the carbide slag slurries of accumulation from the gas distributor of bottom of towe
In, carry out carburizing reagent in carbonators, the speed of bottom of towe stirring is 200~350r/min, in carbide slag slurries calcium hydroxide with
The molar ratio of carbon dioxide in flue gas is 1：1.1~1：1.5, reaction temperature is 30~35 DEG C.
(5) calcium carbonate serosity obtained by the reaction finally obtains light calcium carbonate product by concentration, centrifugation, dry, screening.
At interval of 0.8~1.2 meter equipped with the partition board with sieve pore in the carbonators, partition board is interspersed, and bottom of towe installation is stirred
Device is mixed to strengthen carburizing reagent.
The gas distributor is umbrella shape distributor.
Further, the classification removal of impurities of the carbide slag slurries in the step (3) using three sets and above vibrating screen and
Liquid cyclone slag separator is used in combination, to remove the substance of metal oxide impurities and grain diameter at 60 μm or more.
Further, drying machine is roller shell and tube drying machine in the step (5), and the slurries that drying machine comes out are through water
Film dust-remover recycles calcium carbonate dust therein, and the enrichment tank that the calcium carbonate dust of recycling enters concentration is centrifuged, dried again,
The calcium carbonate that drying machine comes out is screened to obtain light calcium carbonate product.
Roots blower is sent to after flue gas washing in the step (1), heat exchanger and cold air are sent to after wind turbine is pressurized
Carry out heat exchange.
The present invention makes its particle after carbonization tower bottom discharge through step (4) calcium carbonate serosity obtained by the reaction through homogenizing tank
It is uniformly mixed, then concentrated, centrifuge separates that most moisture and shell and tube drying machine be dry, after micronizer screening
It is sent to packing machine and is packaged into product.
Compared with prior art, the beneficial effects of the invention are as follows：
The method of the present invention is raw material using discarded carbide slag and flue gas, and micron order has been made using simple equipment
Calcium carbonate product, product design is up to more than 98%, in the slurries using water dust scrubber recycling roller shell and tube drying machine
Calcium carbonate, improve product yield, provide not only a kind of carbide slag comprehensive utilization mode and also solve problem of environmental pollution,
Considerable economic value is created for enterprise, is a process route being worthy to be popularized.
Description of the drawings
Fig. 1 is the process flow diagram of the embodiment of the present invention 1.
Specific embodiment
The present invention is explained further below in conjunction with the accompanying drawings.
Main chemical reactions of the present invention are:
Ca(OH)2+CO2=CaCO3↓+H2O
Embodiment 1：
As shown in Figure 1, a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions, step are：
(1) the carbon dioxide in flue gas volumn concentration from the production of piece alkali is 9.8%, oxygen volumn concentration
It is 5.5%, nitrogen volumn concentration is 83.7%, and carbon monoxide volumn concentration is 1%, and flue gas is sent to water scrubber,
Sprayed in flue gas and tower and lower water droplet counter current contacting removes the impurity of suspension, then roots blower be pressurized to 35KPa after be sent to
Heat exchanger and cold air carry out heat exchange, and temperature is reduced to the umbrella shape gas distribution that 20 DEG C of flue gas is sent to carbonators after heat exchange
Device, the feed rate of flue gas is 4cm/s.
(2) carbide slag from PVC workshops, wherein calcium hydroxide mass fraction are 92.6%, remaining is carbon, titanium dioxide
Carbide slag is heated to 120 DEG C, H contained therein by silicon, alundum (Al2O3), magnesia and calcium sulfate etc.2S、PH3、C2H2And its
His Analysis of Volatile Organic Impurity, remnant etc. are removed.
(3) it is 5% that the carbide slag slurries after cleaning thicken tank to be adjusted to mass percent through carbide slag, because of each metal oxide
Impurity particle and calcium hydroxide proportion and particle size are different, and then carbide slag slurries are matched through two sets of vibrating screens with liquid cyclone slag separator
It closes using most of metal oxide impurities are removed, dedoping step is as follows：
The primary vibration that carbide slag slurries are sent to 100 mesh by underflow pump sieves, and the carbide slag slurries that primary vibration sieves enter slow
It rushes in tank, cyclone hydraulic separators is pumped by underflow, sieved subsequently into the secondary vibration of 200 mesh, the electricity that secondary vibration is sieved
Rock ballast is pumped into cyclone hydraulic separators through underflow again in starching into surge tank and is centrifuged, rotary filter press outlet carbide slag slurry
Baume degrees is 10 ° of B é, and the three-level vibrating screen into 250 mesh after underflow pump is again fed to cyclone hydraulic separators is screened.
Obtained carbide slag slurries are sent into storage to thicken in tank, the natural subsidence effect for thickening tank adjusts carbide slag concentration
It is squeezed into carbonators through starching pump after to 12%.
(4) carbonators is strengthened using intermittent microbubble, tower is interior to be equipped with the partition board with sieve pore, pore size at interval of 1 meter
For 8mm, percent opening 3.5%, partition board is interspersed, and bottom of towe installs blender to strengthen carburizing reagent, and control stir speed (S.S.) is
350r/min, carbide slag slurries are sprayed from tower top and the lower partition board that passes through becomes drop, and flue gas is by Tower bottom gas distributor with micro-
Small air bubble-shaped is slowly introducing in carbonators, is come into full contact with first with the carbide slag slurries that bottom of towe is accumulated and is reacted the fine carbonic acid of generation
Calcium particle, unreacted flue gas continue to rise, and the flue gas of rising is refined as grain size with the column plate by being spaced apart in tower
The reverse haptoreaction of minimum drop and fine calcium carbonate particle is made, calcium hydroxide and titanium dioxide in flue gas in carbide slag slurries
The molar ratio of carbon is 1：1.1, the temperature for controlling reaction is 30 DEG C, reaction pressure 20KPa.
(5) fine calcium carbonate particle reaches homogenizing tank by carbonators outlet at bottom, is passed through after being thoroughly mixed uniformly
Underflow pump is transported to enrichment tank, and hydrocone type centrifuge with cutter discharge of solid is squeezed into through Pulp pump again through enrichment tank sedimentation concentrate rear slurry,
Centrifuge speed is 1100r/min, and the thick material after centrifugation enters surge bunker through belt conveyor again, is entered by screw conveyor
Roller shell and tube drying machine, calcium carbonate material and temperature are 220 DEG C of saturated vapors in HYGL range of drum shell and tube drying machines
It carries out heat exchange and removes residual moisture, saturated vapor is cooled to condensed water and drains after heat exchange, in roller shell and tube drying machine
The calcium carbonate dust not settled down then after water dust scrubber absorbs is returned in enrichment tank and is recycled as a slurry, water
Gas emptying in film dust-remover out, dried calcium carbonate is again through screw machine, elevator, the air-flow vortex ultramicro grinding of discharging
Machine, surge bunker, packing machine and obtain particle diameter distribution in 5~10 micron-sized products, up to 92, product purity is up to product whiteness
93.6%.
Embodiment 2
As shown in Figure 1, a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions, step are：
(1) the carbon dioxide in flue gas volumn concentration from the production of piece alkali is 12.3%, and oxygen volume basis contains
It is 6.1% to measure, and nitrogen volumn concentration is 80.8%, and carbon monoxide volumn concentration is 0.8%, and flue gas is sent to washing
Tower, sprays in flue gas and tower and lower water droplet counter current contacting removes the impurity of suspension, then roots blower be pressurized to 35KPa after give
Heat exchange is carried out toward heat exchanger and cold air, temperature is reduced to the umbrella shape gas distribution that 22 DEG C of flue gas is sent to carbonators after heat exchange
Device, the feed rate of flue gas is 6cm/s.
(2) carbide slag from PVC workshops, wherein calcium hydroxide mass fraction are 90.8%, remaining is carbon, titanium dioxide
Carbide slag is heated to 120 DEG C, H contained therein by silicon, alundum (Al2O3), magnesia and calcium sulfate etc.2S、PH3、C2H2And its
His Analysis of Volatile Organic Impurity, remnant etc. are removed.
(3) it is 8% that the carbide slag slurries after cleaning thicken tank to be adjusted to mass percent through carbide slag, because of each metal oxide
Impurity particle and calcium hydroxide proportion and particle size are different, and then carbide slag slurries are matched through two sets of vibrating screens with cyclone hydraulic separators
It closes using most of metal oxide impurities are removed, dedoping step is as follows：
The primary vibration that carbide slag slurries are sent to 60 mesh by underflow pump sieves, and the carbide slag slurries that primary vibration sieves enter buffering
In tank, cyclone hydraulic separators is pumped by underflow, is sieved subsequently into the secondary vibration of 140 mesh, the calcium carbide that secondary vibration is sieved
Slurry, which enters, to be pumped into cyclone hydraulic separators through underflow again in surge tank and is centrifuged, rotary filter press outlet carbide slag slurries fluid wave
U.S. degree is 11 ° of B é, and the three-level vibrating screen into 250 mesh after underflow pump is again fed in cyclone hydraulic separators is screened.
Obtained carbide slag slurries are sent into storage to thicken in tank, the natural subsidence effect for thickening tank adjusts carbide slag concentration
It is squeezed into carbonators through starching pump after to 13%.
(4) carbonators is strengthened using intermittent microbubble, tower is interior to be equipped with the partition board with sieve pore at interval of 1.2 meters, and aperture is big
Small is 6mm, percent opening 5%, and partition board is interspersed, and bottom of towe installs blender to strengthen carburizing reagent, and control stir speed (S.S.) is
270r/min, carbide slag slurries are sprayed from tower top and the lower partition board that passes through becomes drop, and flue gas is by Tower bottom gas distributor with micro-
Small air bubble-shaped is slowly introducing in carbonators, is come into full contact with first with the carbide slag slurries that bottom of towe is accumulated and is reacted the fine carbonic acid of generation
Calcium particle, unreacted flue gas continue to rise, and the flue gas of rising is refined as grain size with the column plate by being spaced apart in tower
The reverse haptoreaction of minimum drop and fine calcium carbonate particle is made, calcium hydroxide and titanium dioxide in flue gas in carbide slag slurries
The molar ratio of carbon is 1：1.4, the temperature for controlling reaction is 30 DEG C, reaction pressure 20KPa.
(5) fine calcium carbonate particle reaches homogenizing tank by carbonators outlet at bottom, is passed through after being thoroughly mixed uniformly
Underflow pump is transported to enrichment tank, and hydrocone type centrifuge with cutter discharge of solid is squeezed into through Pulp pump again through enrichment tank sedimentation concentrate rear slurry,
Centrifuge speed is 1200r/min, and the thick material after centrifugation enters surge bunker through belt conveyor again, is entered by screw conveyor
Roller shell and tube drying machine, calcium carbonate material and temperature are 220 DEG C of saturated vapors in HYGL range of drum shell and tube drying machines
It carries out heat exchange and removes residual moisture, saturated vapor is cooled to condensed water and drains after heat exchange, in roller shell and tube drying machine
The calcium carbonate dust not settled down then after water dust scrubber absorbs is returned in enrichment tank and is recycled as a slurry, water
Gas emptying in film dust-remover out, dried calcium carbonate is again through screw machine, elevator, the air-flow vortex ultramicro grinding of discharging
Machine, surge bunker, packing machine and obtain product of the particle diameter distribution at 8~13 microns, up to 93, product purity is up to product whiteness
More than 95.7%.
Embodiment 3
As shown in Figure 1, a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions, step are：
(1) the carbon dioxide in flue gas volumn concentration from the production of piece alkali is 14.6%, and oxygen volume basis contains
It is 5.4% to measure, and nitrogen volumn concentration is 79.54%, and carbon monoxide volumn concentration is 0.46%, and flue gas is sent to water
Wash tower, sprayed in flue gas and tower and after lower water droplet counter current contacting removes the impurity of suspension, then roots blower is pressurized to 35KPa
It is sent to heat exchanger and cold air and carries out heat exchange, temperature is reduced to the umbrella shape gas point that 25 DEG C of flue gas is sent to carbonators after heat exchange
Cloth device, the feed rate of flue gas is 8cm/s.
(2) carbide slag from PVC workshops, wherein calcium hydroxide mass fraction are 91.7%, remaining is carbon, titanium dioxide
Carbide slag is heated to 150 DEG C, H contained therein by silicon, alundum (Al2O3), magnesia and calcium sulfate etc.2S、PH3、C2H2And its
His Analysis of Volatile Organic Impurity, remnant etc. are removed.
(3) it is 10% that the carbide slag slurries after cleaning thicken tank to be adjusted to mass percent through carbide slag, because each metal aoxidizes
Object impurity particle and calcium hydroxide proportion and particle size are different, and then carbide slag slurries are through two sets of vibrating screens and liquid cyclone slag separator
With the use of most of metal oxide impurities are removed, dedoping step is as follows：
The primary vibration that carbide slag slurries are sent to 80 mesh by underflow pump sieves, and the carbide slag slurries that primary vibration sieves enter buffering
In tank, cyclone hydraulic separators is pumped by underflow, is sieved subsequently into secondary vibration of the mesh number for 180 mesh, secondary vibration is sieved
Carbide slag slurries enter and be pumped into cyclone hydraulic separators through underflow again in surge tank and be centrifuged, rotary filter press outlet carbide slag
Slurries Baume degrees is 13 ° of B é, it is carried out after underflow pump is again fed in cyclone hydraulic separators into the three-level vibrating screen of 250 mesh
Screening.
Obtained carbide slag slurries are sent into storage to thicken in tank, the natural subsidence effect for thickening tank adjusts carbide slag concentration
It is squeezed into carbonators through starching pump after to 15%.
(4) carbonators is strengthened using intermittent microbubble, tower is interior to be equipped with the partition board with sieve pore at interval of 0.8 meter, and aperture is big
Small is 6mm, percent opening 4%, and partition board is interspersed, and bottom of towe installs blender to strengthen carburizing reagent, and control stir speed (S.S.) is
200r/min.Carbide slag slurries are sprayed from tower top and the lower partition board that passes through becomes drop, and flue gas is by Tower bottom gas distributor with micro-
Small air bubble-shaped is slowly introducing in carbonators, is come into full contact with first with the carbide slag slurries that bottom of towe is accumulated and is reacted the fine carbonic acid of generation
Calcium particle, unreacted flue gas continue to rise, and the flue gas of rising is refined as grain size with the column plate by being spaced apart in tower
The reverse haptoreaction of minimum drop and fine calcium carbonate particle is made, calcium hydroxide and titanium dioxide in flue gas in carbide slag slurries
The molar ratio of carbon is 1：1.5, the temperature for controlling reaction is 35 DEG C, reaction pressure 20KPa.
(5) fine calcium carbonate particle reaches homogenizing tank by carbonators outlet at bottom, is passed through after being thoroughly mixed uniformly
Underflow pump is transported to enrichment tank, and hydrocone type centrifuge with cutter discharge of solid is squeezed into through Pulp pump again through enrichment tank sedimentation concentrate rear slurry,
Centrifuge speed is 1200r/min, and the thick material after centrifugation enters surge bunker through belt conveyor again, is entered by screw conveyor
Roller shell and tube drying machine, calcium carbonate material and temperature are 220 DEG C of saturated vapors in HYGL range of drum shell and tube drying machines
It carries out heat exchange and removes residual moisture, saturated vapor is cooled to condensed water and drains after heat exchange, in roller shell and tube drying machine
The calcium carbonate dust not settled down then after water dust scrubber absorbs is returned in enrichment tank and is recycled as a slurry, water
Gas emptying in film dust-remover out, dried calcium carbonate is again through screw machine, elevator, the air-flow vortex ultramicro grinding of discharging
Machine, surge bunker, packing machine and obtain product of the particle diameter distribution at 10~15 microns, up to 95, product purity is up to product whiteness
98.2%.
Claims (5)
1. a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions, step are：
（1）Flue gas of the volumn concentration of carbon dioxide not less than 5% is sent to water scrubber, sprayed in flue gas and tower and
Under water droplet counter current contacting remove suspend impurity, after pressurization heat exchange be cooled to be sent to after 20-25 DEG C carbonators gas distribution
Device, flue gas feed rate are 2~8cm/s；
（2）Carbide slag slurries are heated to 120 DEG C~150 DEG C to remove wherein dissolved gas and volatile impurity；
（3）Carbide slag slurries after heating, which enter to thicken after tank adjusting is 5%~10% to calcium hydroxide mass percentage, enters 60
The primary vibration sieve of~100 mesh, is then sieved after cyclone hydraulic separators into the secondary vibration of 140~200 mesh, slurries warp out
Cyclone hydraulic separators is then sent through after surge tank and underflow pump to be centrifuged, rotary filter press outlet carbide slag slurry Baume degrees is 10
~13 ° of B é, are then sent into storage and are thickened tank and carry out being concentrated into calcium hydroxide quality percentage and contain by the third level vibrating screen of 250 mesh
It is 12%~18% to measure, and the carbide slag slurries after concentration are sent to carbonators；
（4）Carbide slag slurries enter carbonators from tower top spray and the lower partition board by sandwich tape sieve pore become drop, slot size
For 6~10mm, percent opening is 3.5%~5%, and flue gas is from the carbide slag slurries that the gas distributor of bottom of towe enters accumulation, in carbon
Change in tower and carry out carburizing reagent, the speed of bottom of towe stirring is 200~350r/min, in carbide slag slurries calcium hydroxide in flue gas
The molar ratio of carbon dioxide is 1：1.1~1：1.5, reaction temperature is 30~35 DEG C；
（5）Calcium carbonate serosity obtained by the reaction finally obtains precipitated calcium carbonate production by concentration, centrifugation, drying machine drying, screening
Product；
At interval of 0.8~1.2 meter equipped with the partition board with sieve pore in the carbonators, partition board is interspersed, bottom of towe installation stirring
Device is to strengthen carburizing reagent；
The step（5）Middle drying machine is roller shell and tube drying machine, and the slurries that drying machine comes out are recycled through water dust scrubber
Calcium carbonate dust therein, the enrichment tank that the calcium carbonate dust of recycling enters concentration are centrifuged, are dried again, what drying machine came out
Calcium carbonate is screened to obtain light calcium carbonate product.
2. a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions according to claim 1, special
Sign is：The step（3）In carbide slag slurries classification removal of impurities using three sets and above vibrating screen and liquid cyclone slag separator
It is used in combination, to remove the substance of metal oxide impurities and grain diameter at 60 μm or more.
3. a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions according to claim 1, special
Sign is：The gas distributor is umbrella shape distributor.
4. a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions according to claim 1, special
Sign is：The step（1）Be sent to roots blower after the washing of middle flue gas, be sent to after wind turbine is pressurized heat exchanger and cold air into
Row heat exchange.
5. a kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions according to claim 1, special
Sign is：Through step（4）Calcium carbonate serosity obtained by the reaction makes the mixing of its particle equal after carbonization tower bottom discharge through homogenizing tank
Even then concentrated, centrifuge is sent to packet after separating most moisture and the drying of shell and tube drying machine, micronizer screening
Installation is packaged into product.
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| CN110104970A (en) * | 2019-06-06 | 2019-08-09 | 长沙紫宸科技开发有限公司 | A method of carbonating cementitious material is prepared using carbide slag |
| CN110040757A (en) * | 2019-06-06 | 2019-07-23 | 长沙紫宸科技开发有限公司 | A method of precipitated calcium carbonate is prepared using carbide slag |
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| CN110078108A (en) * | 2019-06-06 | 2019-08-02 | 长沙紫宸科技开发有限公司 | A method of precipitated calcium carbonate is prepared by raw material of carbide slag |
| CN110104669A (en) * | 2019-06-06 | 2019-08-09 | 长沙紫宸科技开发有限公司 | A method of calcium bicarbonate is prepared with carbide slag |
| CN111330435B (en) * | 2020-03-18 | 2022-05-27 | 福建龙净脱硫脱硝工程有限公司 | Carbide slag absorbent and preparation method thereof |
| CN111717929A (en) * | 2020-07-10 | 2020-09-29 | 沈阳鑫博工业技术股份有限公司 | Carbide slag comprehensive utilization device and method |
| CN112429758A (en) * | 2020-12-08 | 2021-03-02 | 原初科技（北京）有限公司 | Fixation of CO by carbide slag2And a process for preparing calcium carbonate |
| CN114314588B (en) * | 2021-12-17 | 2023-09-12 | 安徽华塑股份有限公司 | CO in waste gas of lime kiln for producing lime 2 Sealing and recycling method |
| CN114620727A (en) * | 2022-04-06 | 2022-06-14 | 杨雪兵 | Method for absorbing carbon dioxide in tail gas of cement plant and power plant by using carbide slag |
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