CN114920471A - Production process of fluidized lime - Google Patents
Production process of fluidized lime Download PDFInfo
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- CN114920471A CN114920471A CN202210298657.5A CN202210298657A CN114920471A CN 114920471 A CN114920471 A CN 114920471A CN 202210298657 A CN202210298657 A CN 202210298657A CN 114920471 A CN114920471 A CN 114920471A
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- Prior art keywords
- lime
- dispersant
- agent
- fluidized
- fluidization
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 65
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 65
- 239000004571 lime Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 53
- 235000019738 Limestone Nutrition 0.000 claims abstract description 36
- 239000006028 limestone Substances 0.000 claims abstract description 36
- 239000000654 additive Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 238000005243 fluidization Methods 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 24
- 238000001354 calcination Methods 0.000 claims abstract description 23
- 230000000996 additive effect Effects 0.000 claims abstract description 22
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 239000003623 enhancer Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 9
- 238000007873 sieving Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims description 22
- 239000011265 semifinished product Substances 0.000 claims description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims description 15
- 229920000388 Polyphosphate Polymers 0.000 claims description 14
- 229920005646 polycarboxylate Polymers 0.000 claims description 14
- 239000001205 polyphosphate Substances 0.000 claims description 14
- 235000011176 polyphosphates Nutrition 0.000 claims description 14
- 125000003342 alkenyl group Chemical group 0.000 claims description 13
- 239000000292 calcium oxide Substances 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 19
- 239000010959 steel Substances 0.000 abstract description 19
- 229920000642 polymer Polymers 0.000 abstract description 15
- 238000006477 desulfuration reaction Methods 0.000 abstract description 11
- 230000023556 desulfurization Effects 0.000 abstract description 11
- 239000012744 reinforcing agent Substances 0.000 abstract description 10
- 238000009628 steelmaking Methods 0.000 abstract description 9
- 239000004890 Hydrophobing Agent Substances 0.000 abstract description 6
- 238000007605 air drying Methods 0.000 abstract description 4
- 230000001965 increasing effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 240000006909 Tilia x europaea Species 0.000 description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 229910052720 vanadium Inorganic materials 0.000 description 21
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 21
- 239000000178 monomer Substances 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 11
- 230000002708 enhancing effect Effects 0.000 description 7
- 238000000605 extraction Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- DPBJAVGHACCNRL-UHFFFAOYSA-N 2-(dimethylamino)ethyl prop-2-enoate Chemical compound CN(C)CCOC(=O)C=C DPBJAVGHACCNRL-UHFFFAOYSA-N 0.000 description 2
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 2
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- SJIXRGNQPBQWMK-UHFFFAOYSA-N 2-(diethylamino)ethyl 2-methylprop-2-enoate Chemical compound CCN(CC)CCOC(=O)C(C)=C SJIXRGNQPBQWMK-UHFFFAOYSA-N 0.000 description 1
- QHVBLSNVXDSMEB-UHFFFAOYSA-N 2-(diethylamino)ethyl prop-2-enoate Chemical compound CCN(CC)CCOC(=O)C=C QHVBLSNVXDSMEB-UHFFFAOYSA-N 0.000 description 1
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- HBMHMDPAZWCIDM-UHFFFAOYSA-N 4-ethenyl-1h-pyridin-2-one Chemical compound OC1=CC(C=C)=CC=N1 HBMHMDPAZWCIDM-UHFFFAOYSA-N 0.000 description 1
- KFDVPJUYSDEJTH-UHFFFAOYSA-N 4-ethenylpyridine Chemical compound C=CC1=CC=NC=C1 KFDVPJUYSDEJTH-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/104—Ingredients added before or during the burning process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
The invention discloses a production process of fluidized lime, which comprises the following steps: the method comprises the following steps: washing limestone with water to remove impurities, air drying, crushing, grinding to obtain limestone powder, mixing the dispersant, the hydrophobing agent and the mixed additive of the fluidization enhancer, calcining the limestone powder after mixing the limestone powder with the mixed additive, grinding, air drying, sieving and separating. According to the invention, a mixed additive of a dispersing agent, a hydrophobic agent and a fluidization reinforcing agent is adopted, methyl silicone oil is adopted as the hydrophobic agent, and polymer grafted graphene oxide is adopted as the fluidization reinforcing agent, so that the prepared fluidized lime can effectively coat the hydrophobic agent on the surface of lime, the fluidity of the product is increased, the air is isolated, the influence of the lime powder on molten steel during steel making and desulfurization due to the fact that the lime powder absorbs moisture in the air is avoided, and the pipeline blockage during steel making and desulfurization is avoided.
Description
Technical Field
The invention relates to the technical field of limestone production, in particular to a production process of fluidized lime.
Background
After the iron ore containing vanadium is smelted into molten iron containing vanadium, the vanadium is usually extracted first, and then steel making can be carried out. Vanadium titano-magnetite is an important vanadium-containing iron ore and has huge reserves in China. Enterprises such as Pan steel, bearing steel, Kun steel and Wei steel adopt vanadium titano-magnetite for smelting. Compared with the common molten iron, the molten iron smelted by the vanadium-titanium magnetite blast furnace has higher vanadium content, and vanadium is an important resource, so vanadium must be extracted before the molten iron is smelted to prepare vanadium slag. At present, the production methods for preparing vanadium slag at home and abroad are more, and mainly comprise a new zealand ladle vanadium blowing process, a south African ladle vanadium extraction process, a Russian and Chinese converter vanadium extraction process and the like, and other vanadium extraction processes also comprise a vanadium-containing steel slag vanadium extraction process, a stone coal vanadium extraction process and the like, wherein the converter vanadium extraction process is optimal, and the technical and economic indexes are best.
In a semi-steel smelting enterprise for extracting vanadium from molten iron, an external molten iron pretreatment desulfurization process, namely a molten iron desulfurization (KR/blowing) -converter vanadium extraction-converter steelmaking-LF/VD (ladle refining/vacuum refining) -continuous casting route is generally adopted, and the molten iron desulfurization adopts single blowing of granular magnesium, granular magnesium and lime powder to meet the requirements of blowing or molten iron KR stirring process.
For most steels, S is a harmful element, which in steel segregates to severely deteriorate the quality of the steel, significantly reducing the plasticity of the steel at high temperatures, leading to the phenomenon of "hot embrittlement" of the steel. With the increasing demand of customers for steel quality, the content of harmful element S in steel is also decreasing, and at present, low-sulfur steel with S content less than 0.010% accounts for more than 50% of the demand of steel in industrially developed countries, and the demand of ultra-low-sulfur steel with sulfur content of 0.001% -0.003% is also greatly increased.
In the steelmaking desulfurizer, lime is an important raw material, and the reaction of lime (CaO) is CaO + [ S ] ═ CaS + [ O ]; however, the more CaO is added, the better the addition amount is, and as the addition amount of CaO increases, the difficulty in melting the slag increases, the viscosity of the slag increases, the fluidity deteriorates, the kinetic conditions for the desulfurization reaction deteriorate, and the desulfurization rate decreases. In order to isolate the atmosphere and avoid the influence of lime powder on molten steel during steel making and desulfurization due to the fact that the lime powder absorbs moisture in the air, and meanwhile avoid pipeline blockage during steel making and desulfurization, the invention researches the production process of fluidized lime for the steel making desulfurizer.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a production process of fluidized lime.
The technical scheme of the invention is as follows:
a process for producing fluidized lime comprising the steps of:
A. washing limestone raw materials to remove impurities, drying in the air, and crushing by a hammer crusher to obtain crushed stones with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the particle size of 4-6 mm;
B. mixing additives of a dispersing agent, a hydrophobic agent and a fluidization enhancing agent;
C. adding limestone powder and mixed additives into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed kiln for calcination, separating by a cyclone separator, and cooling to 250-280 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 950-1080 ℃, and the calcination time is 1.5-2 h;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
Preferably, the dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant.
Further preferably, the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: (0.8-2.5).
Preferably, the hydrophobic agent is methyl silicone oil.
Preferably, the fluidization enhancer is polymer grafted graphene oxide.
Further preferably, the polymer grafted graphene oxide is an alkenyl monomer grafted graphene oxide.
The alkenyl monomer can be any one of styrene, sodium styrene sulfonate, methyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, glycidyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, methyl acrylate, butyl acrylate, hydroxyethyl acrylate, glycidyl acrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, tert-butyl acrylate, acrylamide, methacrylic acid, acrylic acid, 4-vinylpyridine, 2-vinylpyridine, 4-vinylpyridinone or acrylonitrile.
Preferably, in the mixed additive, the mass ratio of the dispersing agent to the hydrophobic agent to the fluidization enhancing agent is (50-70) to 100: (6-10).
Preferably, in the step C, the mass ratio of the limestone powder to the mixed additive is 100: (0.5-1.2).
Preferably, in the step D, the content of calcium oxide in the lime semi-finished product is more than or equal to 90%.
The invention has the advantages that: the production process of the fluidized lime comprises the following steps: washing limestone with water to remove impurities, air drying, crushing, grinding to obtain limestone powder, mixing the limestone powder and a mixed additive of a dispersing agent, a hydrophobizing agent and a fluidization reinforcing agent, calcining, grinding, air drying, sieving and separating. According to the invention, a mixed additive of a dispersing agent, a hydrophobic agent and a fluidization reinforcing agent is adopted, methyl silicone oil is adopted as the hydrophobic agent, and polymer grafted graphene oxide is adopted as the fluidization reinforcing agent, so that the prepared fluidized lime can effectively coat the hydrophobic agent on the surface of lime, the fluidity of the product is increased, the air is isolated, the influence of the lime powder on molten steel during steel making and desulfurization due to the fact that the lime powder absorbs moisture in the air is avoided, and the pipeline blockage during steel making and desulfurization is avoided.
Detailed Description
Example 1
1. A process for producing fluidized lime comprising the steps of:
A. washing limestone raw materials to remove impurities, drying in the air, and crushing by a hammer crusher to obtain crushed stones with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the grain diameter of 4-6 mm;
B. mixing additives of a dispersing agent, a hydrophobic agent and a fluidization enhancing agent;
C. adding limestone powder and mixed additives into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed furnace for calcination, then separating by a cyclone separator and cooling to 260 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 995 ℃, and the calcination time is 1.8 h;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
The dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant; the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: 1.5.
the hydrophobic agent is methyl silicone oil.
The fluidization reinforcing agent is polymer grafted graphene oxide; the polymer grafted graphene oxide is alkenyl monomer grafted graphene oxide.
The alkenyl monomer is methacrylic acid.
In the mixed additive, the mass ratio of the dispersing agent to the hydrophobing agent to the fluidization enhancer is 65: 100: 7.
in the step C, the mass ratio of the limestone powder to the mixed additive is 100: 0.9.
in the step D, the content of calcium oxide in the lime semi-finished product is more than or equal to 90 percent.
Example 2
A process for producing fluidized lime comprising the steps of:
A. washing limestone raw materials to remove impurities, drying, and crushing by a hammer crusher to obtain crushed stone with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the particle size of 4-6 mm;
B. mixing additives of a dispersing agent, a hydrophobic agent and a fluidization enhancing agent;
C. adding limestone powder and mixed additives into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed furnace for calcination, separating by a cyclone separator, and cooling to 280 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 950 ℃, and the calcination time is 2 hours;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
The dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant; the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: 0.8.
the hydrophobic agent is methyl silicone oil.
The fluidization reinforcing agent is polymer grafted graphene oxide; the polymer grafted graphene oxide is alkenyl monomer grafted graphene oxide.
The alkenyl monomer is sodium styrene sulfonate.
In the mixed additive, the mass ratio of the dispersing agent to the hydrophobing agent to the fluidization enhancer is 70: 100: 6.
in the step C, the mass ratio of the limestone powder to the mixed additive is 100: 1.2.
in the step D, the content of calcium oxide in the lime semi-finished product is more than or equal to 90 percent.
Example 3
A production process of fluidized lime comprises the following steps:
A. washing limestone raw materials to remove impurities, drying, and crushing by a hammer crusher to obtain crushed stone with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the grain diameter of 4-6 mm;
B. mixing additives of a dispersing agent, a hydrophobic agent and a fluidization enhancing agent;
C. adding limestone powder and a mixed additive into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed furnace for calcination, separating by a cyclone separator, and cooling to 250 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 1080 ℃ and the calcination time is 1.5 h;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
The dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant; the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: 2.5.
the hydrophobic agent is methyl silicone oil.
The fluidization reinforcing agent is polymer grafted graphene oxide; the polymer grafted graphene oxide is alkenyl monomer grafted graphene oxide.
The alkenyl monomer is dimethylaminoethyl acrylate.
In the mixed additive, the mass ratio of the dispersing agent to the hydrophobing agent to the fluidization enhancer is 50: 100: 10.
in the step C, the mass ratio of the limestone powder to the mixed additive is 100: 0.5.
in the step D, the content of calcium oxide in the lime semi-finished product is more than or equal to 90 percent.
Example 4
A production process of fluidized lime comprises the following steps:
A. washing limestone raw materials to remove impurities, drying, and crushing by a hammer crusher to obtain crushed stone with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the grain diameter of 4-6 mm;
B. mixing additives of a dispersing agent, a hydrophobic agent and a fluidization enhancing agent;
C. adding limestone powder and mixed additives into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed kiln for calcination, separating by a cyclone separator, and cooling to 275 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 1080 ℃ and the calcination time is 1.6 h;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
The dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant; the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: 2.5.
the hydrophobic agent is methyl silicone oil.
The fluidization reinforcing agent is polymer grafted graphene oxide; the polymer grafted graphene oxide is alkenyl monomer grafted graphene oxide.
The alkenyl monomer is sodium styrene sulfonate.
In the mixed additive, the mass ratio of the dispersing agent to the hydrophobing agent to the fluidization enhancer is 55: 100: 10.
in the step C, the mass ratio of the limestone powder to the mixed additive is 100: 0.7.
in the step D, the content of calcium oxide in the lime semi-finished product is more than or equal to 90 percent.
Example 5
A production process of fluidized lime comprises the following steps:
A. washing limestone raw materials to remove impurities, drying, and crushing by a hammer crusher to obtain crushed stone with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the grain diameter of 4-6 mm;
B. mixing additives of a dispersing agent, a hydrophobic agent and a fluidization enhancing agent;
C. adding limestone powder and a mixed additive into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed kiln for calcination, separating by a cyclone separator, and cooling to 250 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 985 ℃, and the calcination time is 1.5 h;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
The dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant; the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: 1.7.
the hydrophobic agent is methyl silicone oil.
The fluidization reinforcing agent is polymer grafted graphene oxide; the polymer grafted graphene oxide is alkenyl monomer grafted graphene oxide.
The alkenyl monomer is 2-vinylpyridine.
In the mixed additive, the mass ratio of the dispersing agent to the hydrophobing agent to the fluidization enhancer is 50: 100: 7.
in the step C, the mass ratio of the limestone powder to the mixed additive is 100: 0.5.
in the step D, the content of calcium oxide in the lime semi-finished product is more than or equal to 90 percent.
Comparative example 1
The polymer grafted graphene oxide in example 1 was replaced with unmodified graphene oxide.
The physical and chemical properties and performance of the limes prepared in the above examples 1-5 and comparative example 1 were tested by using DL/T1483-2015, and the results are shown in Table 1.
Table 1: physical and chemical properties and performance test results of the fluidized lime;
| CaO（wt.%） | C（wt.%） | S（wt.%） | degree of Activity (mL) | |
| Example 1 | 94.18 | 0.01 | 0.02 | 562 |
| Example 2 | 93.77 | 0.01 | 0.02 | 547 |
| Example 3 | 93.65 | 0.01 | 0.02 | 551 |
| Example 4 | 94.08 | 0.01 | 0.02 | 555 |
| Example 5 | 94.11 | 0.01 | 0.02 | 557 |
| Comparative example 1 | 94.12 | 0.01 | 0.02 | 516 |
From the above test data, it can be seen that the fluidized lime prepared by the present invention has very good activity.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. A process for producing fluidized lime, comprising the steps of:
A. washing limestone raw materials to remove impurities, drying in the air, and crushing by a hammer crusher to obtain crushed stones with the diameter of 8-10 mm; then the crushed stone is input into a vertical mill to be ground and sieved to prepare limestone powder with the grain diameter of 4-6 mm;
B. a mixed additive of a dispersant, a hydrophobizing agent and a fluidization enhancer;
C. adding limestone powder and mixed additives into a mixer, and uniformly mixing to obtain a calcined raw material;
D. feeding the calcined raw material into a fluidized bed furnace for calcination, then separating by a cyclone separator and cooling to the temperature of 250-280 ℃ to obtain a lime semi-finished product, wherein the calcination temperature is 950-1080 ℃, and the calcination time is 1.5-2 h;
E. and grinding the lime semi-finished product by using a vertical mill, airing, sieving by using a 250-mesh sieve, and separating by using a cyclone separator to obtain a lime finished product.
2. A process for the production of fluidized lime according to claim 1 wherein the dispersant is a mixture of an organic polycarboxylate dispersant and an inorganic polyphosphate dispersant.
3. The process for producing fluidized lime according to claim 2, wherein the mass ratio of the organic polycarboxylate dispersant to the inorganic polyphosphate dispersant is 1: (0.8-2.5).
4. A process for the production of fluidized lime according to claim 1 wherein the hydrophobic agent is methyl silicone oil.
5. The process for producing fluidized lime according to claim 1, wherein the fluidization enhancer is polymer-grafted graphene oxide.
6. The process for producing fluidized lime according to claim 5, wherein the polymer-grafted graphene oxide is an alkenyl monomer-grafted graphene oxide.
7. The process for producing fluidized lime according to claim 1, wherein the mixing additive comprises a dispersant, a hydrophobizing agent and a fluidization enhancer in a mass ratio of (50-70) to 100: (6-10).
8. The process for producing fluidized lime according to claim 1, wherein in the step C, the mass ratio of the limestone powder to the mixed additive is 100: (0.5-1.2).
9. The process for producing fluidized lime according to claim 1, wherein in the step D, the calcium oxide content in the lime semi-finished product is not less than 90%.
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