CN118108245A - Method for preparing high-purity micron calcium carbonate by using calcium-rich tailings - Google Patents
Method for preparing high-purity micron calcium carbonate by using calcium-rich tailings Download PDFInfo
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- CN118108245A CN118108245A CN202311842483.5A CN202311842483A CN118108245A CN 118108245 A CN118108245 A CN 118108245A CN 202311842483 A CN202311842483 A CN 202311842483A CN 118108245 A CN118108245 A CN 118108245A
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- calcium
- calcium carbonate
- tailings
- micron
- rich
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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 102
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 51
- 239000011575 calcium Substances 0.000 title claims abstract description 47
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 39
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000292 calcium oxide Substances 0.000 claims abstract description 37
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 20
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 19
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 19
- 238000002386 leaching Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000001556 precipitation Methods 0.000 claims abstract description 5
- 238000000746 purification Methods 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims abstract description 4
- 238000004056 waste incineration Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 14
- 229910001868 water Inorganic materials 0.000 claims description 14
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 8
- 239000001110 calcium chloride Substances 0.000 claims description 8
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 238000001035 drying Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000007774 longterm Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 235000010216 calcium carbonate Nutrition 0.000 description 30
- 239000013078 crystal Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance 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
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- 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)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for preparing high-purity micron calcium carbonate by using calcium-rich tailings, which comprises the following steps: s1, adopting NH 4 Cl as a leaching agent to dissolve calcium in the calcium-rich tailings and remove calcium oxide; s2, absorbing carbon dioxide in the flue gas of the waste incineration power plant, and realizing indirect mineralization of active calcium components in tailings through reaction of calcium oxide and carbon dioxide; s3, obtaining the micron-sized calcium carbonate product through mineralization reaction. The invention utilizes the calcium-rich tailings and carbon dioxide collected by carbon capture to carry out carbon mineralization, so as to generate high-purity micron calcium carbonate, which is a bidirectional environment-friendly and efficient carbon mineralization technology, utilizes the calcium oxide component in the calcium-rich tailings, adopts NH 4 Cl as a leaching agent, dissolves calcium in the tailings, absorbs carbon dioxide again, realizes indirect mineralization of active calcium components in the calcium-rich tailings through the steps of precipitation, filtration, purification, filter pressing, drying and the like, obtains green calcium carbonate with economic value, and directly realizes CO 2 capture, long-term stable sealing and industrial utilization.
Description
Technical Field
The invention relates to the technical field of recycling of calcium-rich tailings, in particular to a method for preparing high-purity micron calcium carbonate by using the calcium-rich tailings.
Background
Meanwhile, the country encourages innovation of pollution control modes of the tailing pond, and eliminates the hidden danger of environmental risks of the regional tailing pond. In the development planning of the emerging industry, the comprehensive utilization of large amounts of solid wastes and tailings is greatly promoted, the tailings deep processing and comprehensive utilization technology is developed, the recovery of associated valuable elements in the tailings and the development of high-technology-content tailings products are promoted, the comprehensive utilization economy of the tailings is improved, and the aim of changing waste into valuable is achieved.
The potential environmental risk hazards of the tailing pond have very high stress on surrounding water, soil and environment, and the actual requirements on how to repair the ecological functions and recycle the environment are very great.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a method for preparing high-purity micron calcium carbonate by using calcium-rich tailings, and the method has important significance for realizing long-term stable sealing and storage of CO 2 by comprehensively utilizing the tailings.
In order to achieve the above purpose, the method for preparing high-purity micron calcium carbonate by using the calcium-rich tailings comprises the following steps:
S1, adopting NH 4 Cl as a leaching agent to dissolve calcium in the calcium-rich tailings and remove calcium oxide;
S2, absorbing carbon dioxide in the flue gas of the waste incineration power plant, and realizing indirect mineralization of active calcium components in tailings through reaction of calcium oxide and carbon dioxide;
s3, obtaining the micron-sized calcium carbonate product through mineralization reaction.
Further, the molar ratio of NH 4 Cl to calcium oxide is in the range of 2:1 to 11:1.
Further, the molar ratio of NH 4 Cl to calcium oxide is preferably 9:1.
Further, the content of calcium oxide in the tailings is more than 48%, and the tailings are crushed to be less than 200 meshes by a Raymond mill and are fused into water.
Further, after the calcium oxide is dissolved in water, the liquid-solid ratio range is 5:1-11:1.
Further, the ratio of liquid to solid is preferably 10:1 after the calcium oxide is dissolved in water.
Further, in the step S1, NH 4 Cl is input into a calcium oxide stirring device, and calcium chloride is generated by rapid reaction under the condition of water temperature of 35-40 ℃.
Further, the carbon dioxide reacts with calcium chloride to generate calcium carbonate, the calcium carbonate is subjected to precipitation, filtration and purification, then is dehydrated by a filter press, and finally is dried to obtain the micron-sized calcium carbonate.
Further, the purity of the micron-sized calcium carbonate is 98%, the deposition volume is 2.85g/L, the whiteness is 93, the pH value is 8.2, and 2.28 tons of calcium carbonate are produced per 1 ton of recovered CO 2.
The invention utilizes the calcium-rich tailings and carbon dioxide collected by carbon capture to carry out carbon mineralization, so as to generate high-purity micron calcium carbonate, which is a bidirectional environment-friendly and efficient carbon mineralization technology, utilizes the calcium oxide component in the calcium-rich tailings, adopts NH 4 Cl as a leaching agent, dissolves calcium in the tailings, absorbs carbon dioxide again, realizes indirect mineralization of active calcium components in the calcium-rich tailings through the steps of precipitation, filtration, purification, filter pressing, drying and the like, obtains green calcium carbonate with economic value, and directly realizes CO 2 capture, long-term stable sealing and industrial utilization.
Drawings
FIG. 1 is a graph showing the relationship between the leaching rate of calcium oxide and the amount of ammonium chloride;
FIG. 2 is a graph of calcium oxide leaching rate versus liquid-to-solid ratio;
FIG. 3 shows the process for the fixation of CO 2 and the preparation of nano CaCO 3.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
As shown in fig. 1 and fig. 2, the method for preparing high-purity micron calcium carbonate by using calcium-rich tailings adopts a chemical chain mineralization technology, wherein salt solution and special auxiliary agents are used as carriers, CO 2 and calcium-containing tailings captured by a power plant are used as raw materials, and a mineralization reaction is carried out to obtain a micron-sized calcium carbonate (CaCO 3) product with economic value, and the salt and the special auxiliary agents are recycled in the process.
The invention discloses a method for preparing high-purity micron calcium carbonate by using calcium-rich tailings, which comprises the following steps:
S1, adopting NH 4 Cl as a leaching agent to dissolve calcium in the calcium-rich tailings and remove calcium oxide;
S2, absorbing carbon dioxide in the flue gas of the waste incineration power plant, and realizing indirect mineralization of active calcium components in tailings through reaction of calcium oxide and carbon dioxide;
s3, obtaining the micron-sized calcium carbonate product through mineralization reaction.
According to the invention, NH 4 Cl is used as a leaching agent, calcium in tailings is dissolved, carbon dioxide is absorbed again, and the steps of precipitation, filtration, purification, filter pressing, drying and the like are carried out, so that the indirect mineralization of active calcium components is realized, the green calcium carbonate with economic value is obtained, and the long-term stable sealing and the industrial utilization of CO 2 are directly realized.
Reaction principle:
Ca(OH)2+2NH4Cl＝CaCl2+2NH3·H2O
CO2+CaCl2+2NH3·H2O＝CaCO3↓+2NH4Cl+H2O
The implementation steps of the invention are as follows:
1) The leaching agent is prepared by taking NH 4 Cl as a main raw material.
2) And the tailing ore dissolving module is used for crushing the tailing ore with the calcium oxide content of more than 48 percent to below 200 meshes by a Raymond mill, and then the crushed tailing ore is dissolved into water, wherein the liquid-solid ratio is 10:1.
3) A carbon dioxide mineralization module:
the experimental area is a power plant carbon capture area, the experimental area is set to be 10m or 20m, the prepared leaching agent NH 4 Cl is input into a calcium oxide stirring device, and calcium chloride is generated by rapid reaction under the condition of water temperature of 35-40 ℃; and then the carbon capture device collects carbon dioxide, and the carbon dioxide is flushed into the gas-liquid mass transfer device to react with calcium chloride to generate calcium carbonate. Precipitating, filtering and purifying the calcium carbonate, dehydrating by adopting a filter press, and finally drying to obtain the micron-sized calcium carbonate.
The experimental range of the mole ratio of NH 4 Cl to calcium oxide is from 2:1 to 11:1; the molar ratio of NH 4 Cl to calcium oxide reaches 4: at 1, the calcium oxide leaching rate begins to flatten out and the NH 4 Cl reacted with the calcium oxide at a molar ratio of 9:1 to substantially equilibrate.
Under the condition that the molar ratio of NH 4 Cl to calcium oxide is 9:1, deionized water with different masses is added, the experimental range of the liquid-solid ratio is from 5:1 to 11:1, the leaching rate of the calcium oxide is in an increasing trend along with the increase of the liquid-solid ratio, when the liquid-solid ratio is 9:1, the leaching rate is increased slowly, the liquid-solid ratio is continuously increased to 11:1, and the leaching rate of the calcium oxide is gradually increased. Comprehensively considering, the liquid-solid ratio is 10:1.
As shown in the graph of the relation between the leaching rate of calcium oxide and the dosage of ammonium chloride in FIG. 1 and the graph of the relation between the leaching rate of calcium oxide and the liquid-solid ratio in FIG. 2, the effect is best when the molar ratio of NH 4 Cl to calcium oxide is 9:1 and the liquid-solid ratio is 10:1 from the final result of the yield of the micron calcium carbonate.
The method for preparing the high-purity micron calcium carbonate by utilizing the calcium-rich tailings comprehensively considers the effect and the cost, has the best effect when the molar ratio of NH 4 Cl to calcium oxide is 9:1 and the liquid-solid ratio is 10:1, and has the purity of the micron-sized calcium carbonate product of 98 percent, the deposition volume of 2.85g/L, the whiteness of 93 and the pH value of 8.2; 2.28 tons of calcium carbonate are produced per 1 ton of recovered CO 2.
The invention relates to a process flow for preparing CaCO 3, which is shown in figure 3. Controlling the concentration of Ca (OH) 2 solution, then introducing CO 2 and a certain amount of granularity and crystal form control agent into Ca (OH) 2 solution, regulating the temperature and stirring speed to react for a certain time, and preparing the obtained reaction product into a nano CaCO 3 finished product through steps of filtering, drying and the like.
After CaCO 3 is prepared, the morphology of the calcium carbonate is characterized by a Scanning Electron Microscope (SEM), the average particle size is measured and calculated, the particle size distribution is measured by a particle size analyzer, the crystal structure is analyzed by an X diffractometer (XRD), and the nano CaCO 3 crystal form is characterized. By elucidating the control mechanism of the granularity and the crystal form of the nano CaCO 3. So as to optimize the preparation process of nano CaCO3 and determine the optimal process condition.
And continuously monitoring the pH and temperature change curve in the system during the reaction by adopting a pH meter, thereby determining the reaction ending time. The carbonated product was analyzed and characterized by X-ray diffractometry. And (3) acquiring the microscopic morphology of the reacted sample by using a scanning electron microscope, and calibrating to acquire the calcium carbonate particle size data. Carbon dioxide bubbles are controlled, and for ordinary bubbles, calcium carbonate crystals with an average particle size of 1000nm or more cannot form nano-scale crystals. However, after the micro-bubbles are adopted, the grain diameter of the calcium carbonate crystal is stable at 130-150nm at four gas speeds, and the grain diameter distribution is narrow, because the micro-bubbles strengthen the mass transfer process of CO 2, the supersaturation degree in the solution is increased, the crystal nucleation process is facilitated, and the grain diameter of the crystal is reduced.
The invention has the advantages and effects that:
According to the method for generating the micron calcium carbonate by reacting the calcium-containing tailings serving as the raw material and the NH 4 Cl serving as the leaching agent, the environmental risk hidden danger of the tailings pond in the area is synchronously eliminated while the mineralization of carbon is realized, the tailings deep processing and comprehensive utilization technology is developed, the policies of the recovery of valuable elements in the tailings and the development of the tailings products with high technical content are promoted, the comprehensive utilization of carbon is realized, the comprehensive utilization economy of the tailings is improved, and the waste is changed into valuable.
Claims (9)
1. A method for preparing high-purity micron calcium carbonate by using calcium-rich tailings, which is characterized by comprising the following steps:
S1, adopting NH 4 Cl as a leaching agent to dissolve calcium in the calcium-rich tailings and remove calcium oxide;
S2, absorbing carbon dioxide in the flue gas of the waste incineration power plant, and realizing indirect mineralization of active calcium components in tailings through reaction of calcium oxide and carbon dioxide;
s3, obtaining the micron-sized calcium carbonate product through mineralization reaction.
2. The method for preparing high-purity micron calcium carbonate from calcium-rich tailings according to claim 1, wherein the molar ratio of NH 4 Cl to calcium oxide is in the range of 2:1 to 11:1.
3. The method for preparing high purity micron calcium carbonate from calcium-rich tailings according to claim 2, wherein the molar ratio of NH 4 Cl to calcium oxide is preferably 9:1.
4. The method for preparing high-purity micron calcium carbonate by using calcium-rich tailings according to claim 1, wherein the content of calcium oxide in the tailings is more than 48%, and the tailings are crushed to below 200 meshes by a Raymond mill and are fused into water.
5. The method for preparing high-purity micron calcium carbonate from calcium-rich tailings according to claim 4, wherein the ratio of liquid to solid after the calcium oxide is dissolved in water is in the range of 5:1-11:1.
6. The method for preparing high-purity micron calcium carbonate from calcium-rich tailings according to claim 5, wherein the preferred value of the liquid-solid ratio is 10:1 after the calcium oxide is melted into water.
7. The method for preparing high-purity micron calcium carbonate by using the calcium-rich tailings according to claim 1, wherein in the step S1, NH 4 Cl is input into a calcium oxide stirring device, and the calcium chloride is generated by rapid reaction under the condition of water temperature of 35-40 ℃.
8. The method for preparing high-purity micron calcium carbonate by using calcium-rich tailings according to claim 1, wherein the carbon dioxide reacts with calcium chloride to generate calcium carbonate, the calcium carbonate is subjected to precipitation, filtration and purification, then is dehydrated by a filter press, and finally is dried to obtain micron-sized calcium carbonate.
9. The method for preparing high-purity micron calcium carbonate from calcium-rich tailings according to claim 1, wherein the micron-sized calcium carbonate has a purity of 98%, a deposition volume of 2.85g/L, a whiteness of 93, a ph of 8.2, and 2.28 tons of calcium carbonate are produced per 1 ton of recovered CO 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311842483.5A CN118108245A (en) | 2023-12-29 | 2023-12-29 | Method for preparing high-purity micron calcium carbonate by using calcium-rich tailings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311842483.5A CN118108245A (en) | 2023-12-29 | 2023-12-29 | Method for preparing high-purity micron calcium carbonate by using calcium-rich tailings |
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| CN118108245A true CN118108245A (en) | 2024-05-31 |
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| CN202311842483.5A Pending CN118108245A (en) | 2023-12-29 | 2023-12-29 | Method for preparing high-purity micron calcium carbonate by using calcium-rich tailings |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558275A1 (en) * | 1992-02-26 | 1993-09-01 | Pretoria Portland Cement Company Limited | Production of purified calcium carbonate |
| CN101020579A (en) * | 2006-03-27 | 2007-08-22 | 中国人民解放军国防科学技术大学 | Process of preparing high purity light calcium carbonate fine powder with carbide residue |
| CN113149056A (en) * | 2021-05-31 | 2021-07-23 | 山西石器时代新材料科技有限公司 | Method for preparing calcium carbonate by microbubble-enhanced carbonization |
| CN113620331A (en) * | 2021-07-08 | 2021-11-09 | 浙江大学 | CO (carbon monoxide)2Method for preparing nanosphere aragonite calcium carbonate by mineralizing carbide slag |
| CN115321573A (en) * | 2022-08-31 | 2022-11-11 | 广西川金诺化工有限公司 | Method for preparing light calcium carbonate, magnesium oxide and phosphate concentrate by recycling and treating phosphate tailings |
-
2023
- 2023-12-29 CN CN202311842483.5A patent/CN118108245A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558275A1 (en) * | 1992-02-26 | 1993-09-01 | Pretoria Portland Cement Company Limited | Production of purified calcium carbonate |
| CN101020579A (en) * | 2006-03-27 | 2007-08-22 | 中国人民解放军国防科学技术大学 | Process of preparing high purity light calcium carbonate fine powder with carbide residue |
| CN113149056A (en) * | 2021-05-31 | 2021-07-23 | 山西石器时代新材料科技有限公司 | Method for preparing calcium carbonate by microbubble-enhanced carbonization |
| CN113620331A (en) * | 2021-07-08 | 2021-11-09 | 浙江大学 | CO (carbon monoxide)2Method for preparing nanosphere aragonite calcium carbonate by mineralizing carbide slag |
| CN115321573A (en) * | 2022-08-31 | 2022-11-11 | 广西川金诺化工有限公司 | Method for preparing light calcium carbonate, magnesium oxide and phosphate concentrate by recycling and treating phosphate tailings |
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