CN115806303A - Method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues - Google Patents
Method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues Download PDFInfo
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- CN115806303A CN115806303A CN202111067924.XA CN202111067924A CN115806303A CN 115806303 A CN115806303 A CN 115806303A CN 202111067924 A CN202111067924 A CN 202111067924A CN 115806303 A CN115806303 A CN 115806303A
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- calcium carbonate
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- cyclone
- marble
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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 126
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 63
- 239000004579 marble Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002699 waste material Substances 0.000 title claims abstract description 35
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 66
- 238000001354 calcination Methods 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 239000002928 artificial marble Substances 0.000 claims description 2
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000009700 powder processing Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 239000002270 dispersing agent Substances 0.000 abstract 1
- 238000005086 pumping Methods 0.000 description 8
- 238000001238 wet grinding Methods 0.000 description 4
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 3
- 238000004064 recycling Methods 0.000 description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues. The method comprises the following steps: mixing the marble waste residues into slag slurry, and coarsely separating and removing impurities by using a multistage vibrating screen or a cyclone to obtain-100- + 500-mesh calcium carbonate slurry and-500-mesh slag slurry; taking slag slurry of 500 meshes, adding a dispersing agent for grinding after concentration adjustment, and grading by using a multi-stage micro cyclone to obtain superfine heavy calcium carbonate products with different specifications; and (3) taking calcium carbonate slurry of-100 to +500 meshes, drying the filtered filter residue, and calcining to obtain the active calcium oxide product. The invention utilizes the marble waste residue, obtains the superfine heavy calcium carbonate and the activated calcium oxide products with different fineness by process treatment, realizes the effective utilization of the marble waste residue, solves the environmental pollution, and simultaneously improves the efficient utilization of marble resources.
Description
Technical Field
The invention belongs to the technical field of waste recycling, and particularly relates to a process method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues.
Background
The marble waste residue is a large amount of waste generated in the marble material processing process, and the stacking and landfill treatment of the waste residue cause the waste of marble resources on one hand and cause the serious environmental pollution problem on the other hand. Therefore, the recycling of the marble waste residues is more and more emphasized by enterprises.
Chinese patent application CN106348660A discloses a processing method of marble waste slag, belonging to the technical field of comprehensive utilization of stone processing solid wastes. The method of the present invention comprises the steps of: the method comprises the steps of screening and grading; preparing raw materials; and manufacturing the sheet material. But the patent application only makes primary use of the waste slag.
Disclosure of Invention
The invention aims to provide a method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues, which takes the marble waste residues as raw materials, realizes the cyclic utilization of the marble waste residues and solves the problems of resource waste and environmental pollution.
In order to achieve the purpose, the invention adopts the following scheme:
a method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues comprises the following steps:
1) Rough separation and impurity removal:
mixing marble waste residues into residue slurry with the solid content of 1-50%, and separating by using a multistage vibrating screen or a cyclone to obtain + 100-mesh calcium carbonate slurry, -100- + 500-mesh calcium carbonate slurry and-500-mesh calcium carbonate slurry;
2) Ultra-fine grading:
taking calcium carbonate slurry with-500 meshes, adding a dispersion grinding aid, grinding by a wet method, preparing the slurry with solid content of 5-50%, and carrying out superfine classification by using a multistage micro cyclone or a horizontal screw classifier; the grain diameter D90 of calcium carbonate in the classified slurry is respectively 800-1250 meshes, 1250 meshes-2000 meshes, 3000 meshes-4000 meshes and 5000-6000 meshes; drying, depolymerizing and scattering filter residues obtained after slurry filtration to respectively prepare superfine heavy calcium carbonate with different particle sizes;
3) Activation and calcination:
taking the calcium carbonate slurry of-100 to +500 meshes obtained in the step 1), drying the filter residue obtained after filtering, then sending the filter residue into a calcining furnace, and calcining at the temperature of 800-1300 ℃; cooling the high-temperature material to obtain active calcium oxide, taking the flue gas obtained by cooling and heat exchange as a high-temperature heat source, preheating and drying a calcined calcium carbonate raw material, and drying the superfine heavy calcium carbonate in the step 2).
Preferably, the marble slag refers to slag or slurry generated in natural or artificial marble slab processing and dry or wet marble powder processing, wherein CaCO 3 The content is 50-98 wt%, the whiteness is 75-98, and the granularity is 0.1-180 micrometers.
Preferably, in the step 1), two or three screens with three specifications of 400-500 meshes, 200-300 meshes and 100-150 meshes are adopted as the multistage vibrating screen.
Preferably, in the step 1), one or two cyclones with nominal diameters of phi 75-phi 150 are connected in series.
Preferably, in the step 2), the multistage micro cyclone adopts three or more than three stages of serial classification.
Preferably, the multistage micro cyclone is a three-stage micro cyclone, wherein the inner diameter of a cyclone core pipe adopted by the I-stage micro cyclone is phi 40-50mm, the inner diameter of a cyclone core pipe adopted by the II-stage micro cyclone is phi 20-40mm, and the inner diameter of a cyclone core pipe adopted by the III-stage micro cyclone is phi 7.0-25 mm; the cutting and separating efficiency of each stage of micro cyclone is 70-90%.
Preferably, in the step 3), the calcination is performed by a jet flash calcination method; the spray flash calcination process is as follows:
filtering calcium carbonate slurry with the particle size of-100 to +500 meshes, and drying filter residues in a flash evaporation dryer in a contact manner with high-temperature flue gas generated by a calcining furnace to obtain dry calcium carbonate powder; the calcium carbonate powder is brought into the jet combustion chamber by high-speed hot air of 200-400 ℃ through the ejector, and is flash-mixed with high-temperature heat flow generated by combustion of fuel injected into the combustion chamber, the temperature in the combustion chamber is 800-1300 ℃, calcium carbonate rapidly reacts in the calcining furnace, and the activated calcium oxide product is obtained through cyclone separation.
Specifically, the method for preparing the superfine ground calcium carbonate and co-producing the activated calcium oxide by using the marble waste residues comprises the following steps:
(1) Rough separation and impurity removal:
mixing marble waste residues into slag slurry with the solid content of 1-50%, pumping the slag slurry to a multistage vibrating screen with the mesh of 100-500 or a swirler with the nominal diameter phi 75-phi 150, and adjusting the diameter of a screen mesh or the swirler of the vibrating screen and the diameter of an overflow underflow port to prepare calcium carbonate slurry with the mesh of +100, the mesh of-100- +500 and the mesh of-500;
(2) Ultra-fine grading:
taking the calcium carbonate slurry of the step (1) -500 meshes, adding a dispersion grinding aid, preparing the calcium carbonate slurry into slurry with the solid content of 5-50% after wet grinding, and pumping the slurry into a multistage miniature cyclone or a horizontal screw classifier for classification by using a slurry with the pressure of 0.05-1.2 MPa; the particle size D90 of the ground paste classified calcium carbonate is respectively 800-1250 meshes, 1250 meshes-2000 meshes, 3000 meshes-4000 meshes and 5000-6000 meshes; drying, depolymerizing and scattering filter residues obtained after slurry filtration to respectively prepare superfine heavy calcium carbonate with different particle sizes;
(3) Activation and calcination:
taking the calcium carbonate slurry of the step (1) -100- +500 meshes, drying the filter residue obtained after filtering, then sending the filter residue into a calcining furnace, and calcining at the temperature of 800-1200 ℃; cooling the high-temperature material by using cold air through a heat exchanger to prepare active calcium oxide, taking the flue gas as a high-temperature heat source, preheating and drying a part of the flue gas used as a calcined calcium carbonate raw material, and sending the other part of the flue gas to the step (2) to dry the superfine heavy calcium carbonate.
The coarse separation and impurity removal of the invention means that impurities with a size of +100 meshes in the large waste residue are removed to obtain calcium carbonate slurry with a size of-100- +500 meshes and-500 meshes.
In the invention, the dispersion grinding aid adopts one or two of sodium hexametaphosphate and sodium polyacrylate, and the dosage of the dispersion grinding aid is 0.1-0.5 percent of the slurry.
In the present invention, "%" is not specifically defined, and all means mass%.
In the invention, the micro cyclone is a cyclone core tube internally provided with liquid-solid multiphase fluid micron and submicron particulate matter deep trapping and cutting, three or more than three stages are connected in series, the inner diameter of the cyclone core tube adopted by the I-stage micro cyclone is phi 40-50mm, the inner diameter of the cyclone core tube adopted by the II-stage micro cyclone is phi 20-40mm, and the inner diameter of the cyclone core tube adopted by the III-stage micro cyclone is phi 7.0-25 mm.
Preferably, in the step (3), the calcination is performed by using a jet flash calciner.
Preferably, in the step (3), a flash dryer is used for drying.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the marble waste residue, obtains the superfine heavy calcium carbonate and the activated calcium oxide products with different fineness by process treatment, realizes the effective utilization of the marble waste residue, solves the environmental pollution, and simultaneously improves the efficient utilization of marble resources. In the invention, the heat source of the flash evaporation dryer is derived from the high-temperature flue gas of the calcining furnace, so that the high-temperature flue gas generated by fuel combustion is secondarily utilized, and the waste of resources is reduced.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
A method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residue, as shown in figure 1, comprising the following steps:
(1) Mixing marble waste residues into slag slurry with the solid content of 45%, and pumping the slag slurry to a vibrating screen with 150 meshes and 500 meshes to obtain calcium carbonate slurry with +100 meshes, -100- +500 meshes and-500 meshes;
(2) Taking the calcium carbonate slurry of the step (1) -500 meshes, adding 0.1% of sodium polyacrylate, carrying out wet grinding, preparing into slurry with the solid content of 20%, pumping the slurry into a cyclone by using slag slurry with the pressure of 1.0MPa for classification, and obtaining slurry with different specifications: the grain diameter D90 is respectively 800-1250 meshes, 1250 meshes-2000 meshes, 3000 meshes-4000 meshes and 5000-6000 meshes, after filtration, the filter residue is flash dried and scattered by a scattering machine to obtain the superfine heavy calcium carbonate with different grain sizes.
(3) And (2) taking the calcium carbonate slurry of the step (1) -100 to +500 meshes, drying the filter residue obtained after filtering, then sending the filter residue into a calcining furnace, calcining at 1100 ℃, and cooling to obtain the active calcium oxide.
Example 2
A method for preparing ultrafine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues is shown in figure 1 and comprises the following steps:
(1) Mixing marble waste residues into slag slurry with the solid content of 45%, pumping the slag slurry to a swirler with the nominal diameter of phi 75 and phi 150, and performing cyclone classification for multiple times to obtain calcium carbonate slurry with the meshes of +100, minus 100 to +500 and minus 500;
(2) Taking the calcium carbonate slurry of the step (1) -500 meshes, adding 0.2% of sodium hexametaphosphate, carrying out wet grinding, preparing into slurry with the solid content of 15%, pumping the slurry with the pressure of 0.6MPa to a horizontal spiral classifier for classification, and obtaining slurry with different specifications: the grain diameter D90 is respectively 800-1250 meshes, 1250 meshes-2000 meshes, 3000 meshes-4000 meshes and 5000-6000 meshes, after filtration, the filter residue is flash dried and scattered by a scattering machine to obtain the superfine heavy calcium carbonate with different grain sizes.
(3) And (3) taking the calcium carbonate slurry of which the granularity is 100 to 500 meshes in the step (1), drying filter residues obtained after filtering, then sending the filter residues into a calcining furnace, calcining at the temperature of 1200 ℃, and cooling to obtain the active calcium oxide.
In the embodiment of the invention, the content of calcium oxide can be increased to more than 98%, the whiteness is increased to more than 94, and the activation degree is more than 320 (4 mol/ml).
Example 3
A method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residue, as shown in figure 1, comprising the following steps:
(1) Mixing marble waste residues into slag slurry with the solid content of 45%, pumping the slag slurry to a vibrating screen with 100 meshes and a swirler with the nominal diameter of phi 75, and grading the slag slurry and the swirler for multiple times to obtain calcium carbonate slurry with the meshes of +100, -100- +500 and-500;
(2) Taking the calcium carbonate slurry of the step (1) -500 meshes, adding 0.5% of sodium polyacrylate, carrying out wet grinding, preparing into slurry with the solid content of 12%, pumping the slurry into a cyclone by using a slag slurry pump with the pressure of 1.2MPa for classification, and obtaining slurry of different specifications: the grain diameter D90 is respectively 800-1250 meshes, 1250 meshes-2000 meshes, 3000 meshes-4000 meshes and 5000-6000 meshes, after filtration, the filter residue is flash dried and scattered by a scattering machine to obtain the superfine heavy calcium carbonate with different grain sizes.
(3) And (3) taking the calcium carbonate slurry of which the granularity is 100 to 500 meshes in the step (1), drying filter residues obtained after filtering, then sending the filter residues into a calcining furnace, calcining at the temperature of 1000 ℃, and cooling to obtain the active calcium oxide.
TABLE 1 particle size parameters for each of the steps of examples 1-3
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues comprises the following steps:
1) Roughly separating and removing impurities:
mixing marble waste residues into residue slurry with the solid content of 1-50%, and separating by using a multistage vibrating screen or a cyclone to obtain + 100-mesh calcium carbonate slurry, -100- + 500-mesh calcium carbonate slurry and-500-mesh calcium carbonate slurry;
2) Ultra-fine grading:
taking calcium carbonate slurry with-500 meshes, adding a dispersion grinding aid, grinding by a wet method, preparing the slurry with solid content of 5-50%, and carrying out superfine classification by using a multistage micro cyclone or a horizontal screw classifier; the grain diameter D90 of calcium carbonate in the classified slurry is respectively 800-1250 meshes, 1250 meshes-2000 meshes, 3000 meshes-4000 meshes and 5000-6000 meshes; drying, depolymerizing and scattering filter residues obtained after slurry filtration to respectively prepare superfine heavy calcium carbonate with different particle sizes;
3) Activation and calcination:
taking the-100 to + 500-mesh calcium carbonate slurry obtained in the step 1), drying filter residues obtained after filtering, then sending the filter residues into a calcining furnace, and calcining at the temperature of 800-1300 ℃; cooling the high-temperature material to obtain active calcium oxide, taking the flue gas obtained by cooling and heat exchange as a high-temperature heat source, preheating and drying a calcined calcium carbonate raw material, and drying the superfine heavy calcium carbonate in the step 2).
2. The method of claim 1, wherein the marble slag is slag or slurry generated from a natural or artificial marble slab processing process and a dry or wet marble powder processing process, wherein CaCO 3 The content is 50-98 wt%, the whiteness is 75-98, and the granularity is 0.1-180 micrometers.
3. The method as claimed in claim 1, wherein in the step 1), two or three screens of three sizes of 400-500 meshes, 200-300 meshes and 100-150 meshes are adopted as the multistage vibrating screen.
4. The method according to claim 1, wherein in step 1), one or two kinds of cyclones with nominal diameters of phi 75-phi 150 are connected in series.
5. The method of claim 1, wherein in step 2), the multistage micro cyclone is classified in series by three or more stages.
6. The method according to claim 5, wherein the multistage micro cyclone is a three-stage micro cyclone, wherein the inner diameter of a cyclone core tube adopted by the I-stage micro cyclone is phi 40-50mm, the inner diameter of a cyclone core tube adopted by the II-stage micro cyclone is phi 20-40mm, and the inner diameter of a cyclone core tube adopted by the III-stage micro cyclone is phi 7.0-25 mm; the cutting and separating efficiency of each stage of the miniature cyclone is 70-90%.
7. The method of claim 1, wherein in step 3), the calcination is carried out by a jet flash calcination method; the spray flash calcination process is as follows:
filtering calcium carbonate slurry with the particle size of-100 to +500 meshes, and drying filter residues in a flash evaporation dryer in a contact manner with high-temperature flue gas generated by a calcining furnace to obtain dry calcium carbonate powder; the calcium carbonate powder is brought into a jet combustion chamber by high-speed hot air of 200-400 ℃ through an injector, and is flash-mixed with high-temperature heat flow generated by combustion of fuel injected into the combustion chamber, the temperature in the combustion chamber is 800-1300 ℃, calcium carbonate rapidly reacts in a calcining furnace, and an active calcium oxide product is obtained through cyclone separation.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6143065A (en) * | 1999-07-12 | 2000-11-07 | J. M. Huber Corporation | Precipitated calcium carbonate product having improved brightness and method of preparing the same |
| CN101503208A (en) * | 2009-03-13 | 2009-08-12 | 杭州稳健钙业有限公司 | Process for preparing high concentration milky calcium hydroxide |
| CN101624654A (en) * | 2009-04-17 | 2010-01-13 | 华中科技大学 | Method for recycling iron and aluminum by particle size grading pretreatment of Bayer process red mud |
| CN104845411A (en) * | 2015-05-29 | 2015-08-19 | 四川石棉巨丰粉体有限公司 | Superfine ground calcium carbonate powder production method |
| CN107416883A (en) * | 2017-09-13 | 2017-12-01 | 洛阳冀能新材料有限公司 | A kind of ore resource method of comprehensive utilization in calcium carbonate mine |
| CN107902685A (en) * | 2017-11-20 | 2018-04-13 | 广西河池华泰新材料科技有限公司 | A kind of no grinding aid wet-milling, slurry grading system for superfine heavy calcium carbonate technique |
-
2021
- 2021-09-13 CN CN202111067924.XA patent/CN115806303A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6143065A (en) * | 1999-07-12 | 2000-11-07 | J. M. Huber Corporation | Precipitated calcium carbonate product having improved brightness and method of preparing the same |
| CN101503208A (en) * | 2009-03-13 | 2009-08-12 | 杭州稳健钙业有限公司 | Process for preparing high concentration milky calcium hydroxide |
| CN101624654A (en) * | 2009-04-17 | 2010-01-13 | 华中科技大学 | Method for recycling iron and aluminum by particle size grading pretreatment of Bayer process red mud |
| CN104845411A (en) * | 2015-05-29 | 2015-08-19 | 四川石棉巨丰粉体有限公司 | Superfine ground calcium carbonate powder production method |
| CN107416883A (en) * | 2017-09-13 | 2017-12-01 | 洛阳冀能新材料有限公司 | A kind of ore resource method of comprehensive utilization in calcium carbonate mine |
| CN107902685A (en) * | 2017-11-20 | 2018-04-13 | 广西河池华泰新材料科技有限公司 | A kind of no grinding aid wet-milling, slurry grading system for superfine heavy calcium carbonate technique |
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