CN115072752A - Method for preparing high-purity magnesium oxide by using light-burned dolomite - Google Patents
Method for preparing high-purity magnesium oxide by using light-burned dolomite Download PDFInfo
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- CN115072752A CN115072752A CN202210735726.4A CN202210735726A CN115072752A CN 115072752 A CN115072752 A CN 115072752A CN 202210735726 A CN202210735726 A CN 202210735726A CN 115072752 A CN115072752 A CN 115072752A
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 35
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 28
- 239000010459 dolomite Substances 0.000 title claims abstract description 28
- 238000003763 carbonization Methods 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000011777 magnesium Substances 0.000 claims abstract description 30
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 30
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000000839 emulsion Substances 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 239000012065 filter cake Substances 0.000 claims abstract description 21
- 239000000706 filtrate Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 14
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 13
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 230000001079 digestive effect Effects 0.000 claims abstract description 10
- 238000001354 calcination Methods 0.000 claims abstract description 9
- 238000010000 carbonizing Methods 0.000 claims abstract description 6
- 238000000967 suction filtration Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 11
- 239000011575 calcium Substances 0.000 claims description 11
- 229910052791 calcium Inorganic materials 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
- 239000002244 precipitate Substances 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 208000032826 Ring chromosome 3 syndrome Diseases 0.000 description 8
- 239000000725 suspension Substances 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 2
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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- 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
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- 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
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/24—Magnesium carbonates
-
- 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
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- 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
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- 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
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- 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
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Nanotechnology (AREA)
- Thermal Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
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Abstract
The invention discloses a method for preparing high-purity magnesium oxide by using light-burned dolomite. Adding a proper amount of light-burned dolomite fine powder into hot water, and stirring and digesting for 1h in a constant-temperature water bath at a liquid-solid ratio of 40:1 to obtain digestive emulsion; filtering the digestive emulsion for multiple times to obtain refined magnesium filter cake, adding water to the refined magnesium filter cake, transferring the refined magnesium filter cake and the filtrate to a carbonization device respectively, and introducing CO 2 Stirring and carbonizing for a certain time; and after the filter cake is carbonized, carrying out suction filtration on the emulsion to obtain heavy magnesium water, pyrolyzing the heavy magnesium water at a certain temperature for a period of time to obtain basic magnesium carbonate precipitate, and calcining the basic magnesium carbonate at a certain temperature to obtain magnesium oxide powder. The invention can not only improve the purity of the magnesium oxide to more than 99 percent, but also improve the purity of the byproduct calcium carbonate in the process toMore than 99 percent and the whiteness is more than 97 percent.
Description
Technical Field
The invention relates to a process method for processing and utilizing minerals, in particular to a method for preparing high-purity magnesium oxide by utilizing light-burned dolomite.
Background
The existing method for preparing high-purity magnesium oxide by using light-burned dolomite wastes resources, occupies land and pollutes the environment. The method for preparing the magnesium oxide by utilizing the dolomite is industrialized at present, the effective utilization of the dolomite is promoted, and conditions are provided for further improving the quality of the magnesium oxide product.
However, the method also has the problems that magnesium and calcium are not completely separated, the content of calcium in the prepared magnesium oxide product is too high, and the utilization rate of magnesium is low; meanwhile, calcium cannot be effectively utilized, and the problems of low economic benefit, high energy consumption and the like of the prepared calcium product also exist, so that the method needs to be deeply researched to improve the utilization rate of magnesium and calcium.
Wu Chengyou et al research shows that the process research of preparing high-purity magnesium oxide from dolomite by a carbonization method: finally, basic magnesium carbonate with CaO less than 0.1% can be prepared, and high-purity magnesium oxide with MgO more than 99% can be prepared after calcination; but the quality of calcium carbonate in the process can not reach 99 percent of purity.
Research on preparation of high-purity magnesium oxide by dolomite carbonization method in Ganyu et al shows that: can prepare a flaky high-purity magnesium oxide product with the MgO content of 99.56 percent and the CaO content of 0.16 percent; but the quality of calcium carbonate in the process can not reach 99 percent of purity, and the method has the problems of low economic benefit, low utilization rate, narrow utilization range and the like of flaky magnesium oxide.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing high-purity magnesium oxide by using light-burned dolomite.
The technical solution of the invention is as follows: a method for preparing high-purity magnesium oxide from light-burned dolomite comprises a carbonization device and a pH tester, wherein a carbonization ring is arranged at the bottom of the carbonization device, the shell of the carbonization ring is annular, and CO is arranged in the annular shell 2 Powder, wherein the shell is provided with a vent hole, and the preparation steps comprise:
step 1: adding a proper amount of light-burned dolomite fine powder into hot water, wherein the liquid-solid ratio is 40:1 stirring and digesting for 1h in a constant-temperature water bath to obtain digestive emulsion, and filtering the digestive emulsion for multiple times to obtain filtrate, namely refined calcium solution and refined magnesium filter cake;
step 2: transferring the refined calcium solution obtained in the step 1 into a carbonization device and introducing CO 2 Adding dropwise NaOH into the emulsion obtained after carbonization for a certain time, continuously stirring to enable the emulsion to fully react until the pH is =12, and filtering to obtain high-purity nano calcium carbonate solid;
and step 3: adding water into the refined magnesium filter cake obtained in the step 1 according to a certain solid-to-liquid ratio, transferring the refined magnesium filter cake into a carbonization device, and introducing CO 2 Stirring, monitoring pH change, and carbonizing for a certain time to obtain carbonized emulsion;
and 4, step 4: filtering the carbonized emulsion obtained in the step (3) to obtain filtrate heavy magnesium water and precipitated heavy calcium carbonate, pyrolyzing the heavy magnesium water at a certain temperature for a period of time, filtering and drying to obtain basic magnesium carbonate;
and 5: and (5) calcining the basic magnesium carbonate obtained in the step (4) at a certain temperature to obtain superfine magnesium oxide powder.
According to the embodiment of the invention, the filtration mode in the step 1 is filter cake suction filtration separation.
According to the embodiment of the invention, the carbonization device in the step 2 is used for producing CO by one-way ventilation 2 An environmental device.
According to the embodiment of the invention, the aeration mode of the carbonization device in the step 2 is carbonization ring aeration.
According to the embodiment of the present invention, the monitoring of the pH change in step 3 refers to starting the monitoring before the carbonization starts until the carbonization is completely finished.
According to the embodiment of the invention, the calcination temperature in the step 5 is 450-750 ℃.
The working principle of preparing high-purity magnesium oxide by using light-burned dolomite lies in that: the dolomite contains magnesium element required for preparing high-purity magnesium oxide, and can be separated from other elements.
The beneficial technical effects of the invention are as follows: (1) the application range is wide, and the method is suitable for various light-burned dolomite; (2) the carbonization ring can effectively improve the dispersion degree of carbon dioxide in water, thereby improving the utilization rate of carbon dioxide and reducing the using amount of carbon dioxide; (3) the gas flowing direction after passing through the carbonization ring can impact the solid particles deposited at the bottom of the carbonization device, so that the solid particles are uniformly dispersed in water, the stirring is facilitated, the contact degree of the solid particles and carbon dioxide is improved, and the reaction is quicker and more sufficient; (4) reaction products in each stage are fully utilized, and energy is saved; (5) compared with the prior process flow for preparing the magnesium oxide by the dolomite carbonization method, the method can not only improve the purity of the magnesium oxide to more than 99 percent, but also improve the purity of the byproduct calcium carbonate in the process to more than 99 percent and improve the whiteness to more than 97 percent.
Drawings
FIG. 1 is a structural view of a carbide ring.
In the figure: 1-airflow direction, 2-vent hole, 3-carbonization ring, and 4-shell.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention. In addition, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
A method for preparing high-purity magnesium oxide by using light-burned dolomite comprises the following required equipment: carbonization deviceA pH tester, a carbonization ring 3 is arranged at the bottom of the carbonization device, a shell 4 of the carbonization ring 3 is annular, and CO is arranged in the annular shell 4 2 Powder, set up air vent 2 on shell 4, air current direction 1 is along air vent 2, and the preparation step includes:
step 1: adding a proper amount of light-burned dolomite fine powder into hot water, wherein the liquid-solid ratio is 40:1 stirring and digesting for 1h in a constant-temperature water bath to obtain digestive emulsion, and filtering the digestive emulsion for multiple times to obtain filtrate, namely refined calcium solution and refined magnesium filter cake;
step 2: transferring the refined calcium solution obtained in the step 1 into a carbonization device and introducing CO 2 Adding dropwise NaOH into the emulsion obtained after carbonization for a certain time, continuously stirring to enable the emulsion to fully react until the pH is =12, and filtering to obtain high-purity nano calcium carbonate solid;
and step 3: adding water into the refined magnesium filter cake obtained in the step 1 according to a certain solid-to-liquid ratio, transferring the refined magnesium filter cake into a carbonization device, and introducing CO 2 Stirring, monitoring pH change, and carbonizing for a certain time to obtain carbonized emulsion;
and 4, step 4: filtering the carbonized emulsion obtained in the step (3) to obtain filtrate heavy magnesium water and precipitated heavy calcium carbonate, pyrolyzing the heavy magnesium water at a certain temperature for a period of time, filtering and drying to obtain basic magnesium carbonate;
and 5: and (4) calcining the basic magnesium carbonate obtained in the step (4) at a certain temperature to obtain superfine magnesium oxide powder.
Example 1:
step 1: adding 20g of light-burned dolomite fine powder into hot water in a certain mining area, stirring and digesting for 1h in a water bath at the constant temperature of 70 ℃ at the liquid-solid ratio of 40:1 to obtain digestive emulsion, and filtering for multiple times to obtain filtrate and filter cakes; filtering for 3-5 times.
Step 2: selecting the filter cake obtained in the step 1, adding water according to the solid-to-liquid ratio of 40:1, transferring the filter cake into a carbonization device, and introducing CO through a vent hole 2 of a carbonization ring 3 2 And gas flows out from the carbonization ring 3 according to the gas flow direction 1, carbonization is carried out for 1h to obtain carbonized emulsion, and filtrate heavy magnesium water and precipitated heavy calcium carbonate are obtained by suction filtration.
And step 3: selecting the filtrate obtained in the step 1, transferring the filtrate into a carbonization device, and introducing CO through a vent hole 2 of a carbonization ring 3 2 Gas from the carbonising ring3, flowing out according to the gas flow direction 1, carbonizing for 10min to obtain a calcium bicarbonate suspension, continuously stirring the suspension, dropwise adding a 1mol/L NaOH solution to the pH =12 to enable the suspension to react sufficiently, filtering and drying to finally obtain the nano calcium carbonate solid.
And 4, step 4: and (3) carrying out filter pressing on the carbonized emulsion obtained in the step (2) to obtain filtrate heavy magnesium water, heating the filtrate heavy magnesium water at a pyrolysis temperature of 90 ℃ for 5min in a mode of heating the filtrate by an electric heating pot for 10min, and filtering and drying the filtrate to obtain basic magnesium carbonate precipitate.
And 5: and (4) calcining the basic magnesium carbonate prepared in the step (4) at 750 ℃ to prepare high-purity superfine magnesium oxide.
The product effect is tested by measuring the mass fractions of MgO and CaO by using an EDTA volumetric method and ICP to obtain a new process flow data table A shown in Table 1, which is as follows.
The purity of the finally obtained magnesium oxide product can reach 99.40 percent, wherein the content of CaO is 0.04 percent, the magnesium oxide particles are in a cubic crystal form, the particle size is 90-120 nm, and CaCO 3 The purity of the product reaches 99.0 percent, and the whiteness reaches 97.3. The particle size is 80-100 nm.
Example 2:
step 1: adding hot water into 20g of light-burned dolomite fine powder in the other mining area, stirring and digesting for 1h in a water bath at the constant temperature of 70 ℃ with the liquid-solid ratio of 40:1 to obtain digestive emulsion, and filtering for multiple times to obtain filtrate and filter cake.
Step 2: selecting the filter cake obtained in the step 1, adding water according to the solid-to-liquid ratio of 40:1, transferring the filter cake into a carbonization device, and introducing CO through a vent hole 2 of a carbonization ring 2 And gas flows out from the carbonization ring 3 according to the gas flow direction 1, carbonization is carried out for 1h to obtain carbonized emulsion, and filtrate heavy magnesium water and precipitated heavy calcium carbonate are obtained by suction filtration.
And step 3: selecting the filtrate obtained in the step 1, transferring the filtrate into a carbonization device, and introducing CO through a vent hole 2 of a carbonization ring 2 The gas flows out from the carbonization ring 3 according to the gas flow direction 1, the calcium bicarbonate suspension is obtained after carbonization for 10min, and the suspension is continuously stirred and dropwise added with 1mol/L NaOH solution until the pH is =12 to ensure that the suspension is subjected toFully reacting, filtering and drying to finally obtain the nano calcium carbonate solid.
And 4, step 4: and (3) carrying out filter pressing on the carbonized emulsion obtained in the step (2) to obtain filtrate heavy magnesium water, heating the filtrate heavy magnesium water in an electric heating pot in a pyrolysis mode at the pyrolysis temperature of 90 ℃, carrying out pyrolysis for 20min, and filtering and drying to obtain basic magnesium carbonate precipitate.
And 5: and (4) calcining the basic magnesium carbonate prepared in the step (4) at 750 ℃ to prepare high-purity magnesium oxide.
The product effect is tested by measuring the mass fractions of MgO and CaO by using an EDTA volumetric method and ICP to obtain a new process flow data table B shown in Table 2, which is as follows.
The purity of the finally obtained magnesium oxide product can reach 99.32 percent, wherein the content of CaO is 0.05 percent, the magnesium oxide particles are in a cubic crystal form, the particle size is 90-120 nm, and CaCO 3 The purity of the product reaches 99.1 percent, and the whiteness reaches 97.2. The particle size is 80-100 nm.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (6)
1. A method for preparing high-purity magnesium oxide by using light-burned dolomite is characterized in that the required equipment comprises the following steps: the carbonization device, the pH tester, carbonization device bottom sets up carbonization ring (3), shell (4) of carbonization ring (3) are the annular, set up CO in annular shell (4) 2 Powder, wherein a vent hole (2) is formed in a shell (4), and the preparation steps comprise:
step 1: adding a proper amount of light-burned dolomite fine powder into hot water, wherein the liquid-solid ratio is 40:1, stirring and digesting for 1 hour in a constant-temperature water bath to obtain digestive emulsion, and filtering the digestive emulsion for multiple times to obtain filtrate, namely refined calcium solution and refined magnesium filter cake;
step 2: transferring the refined calcium solution obtained in the step 1 into a carbonization device and introducingCO 2 Adding NaOH dropwise into the emulsion obtained after carbonization for a certain period of time, continuously stirring to enable the emulsion to fully react until the pH value is =12, and filtering to obtain high-purity nano calcium carbonate solid;
and 3, step 3: adding water into the refined magnesium filter cake obtained in the step 1 according to a certain solid-to-liquid ratio, transferring the refined magnesium filter cake into a carbonization device, and introducing CO 2 Stirring, monitoring pH change, and carbonizing for a certain time to obtain carbonized emulsion;
and 4, step 4: filtering the carbonized emulsion obtained in the step (3) to obtain filtrate heavy magnesium water and precipitated heavy calcium carbonate, pyrolyzing the heavy magnesium water at a certain temperature for a period of time, filtering and drying to obtain basic magnesium carbonate;
and 5: and (4) calcining the basic magnesium carbonate obtained in the step (4) at a certain temperature to obtain superfine magnesium oxide powder.
2. The method for preparing high-purity magnesium oxide by using light calcined dolomite according to claim 1, wherein the filtration mode in the step 1 is filter cake suction filtration separation.
3. The method for preparing high-purity magnesia by using light-burned dolomite according to claim 1, wherein the carbonizing device in the step 2 is used for producing CO by unidirectional aeration 2 An environmental device.
4. The method for preparing high-purity magnesia by using light calcined dolomite according to claim 1, wherein the aeration mode of the carbonization device in the step 2 is carbonization ring aeration.
5. The method for preparing high purity magnesia using light burned dolomite according to claim 1, wherein the monitoring of the pH change in step 3 is started before the start of carbonization until the completion of carbonization.
6. The method for preparing high-purity magnesium oxide from light calcined dolomite according to claim 1, wherein the calcination temperature in the step 5 is 450-750 ℃.
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Application publication date: 20220920 |