CN115818678A - Production process of high-quality light magnesium carbonate and light magnesium oxide - Google Patents
Production process of high-quality light magnesium carbonate and light magnesium oxide Download PDFInfo
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- CN115818678A CN115818678A CN202210841373.6A CN202210841373A CN115818678A CN 115818678 A CN115818678 A CN 115818678A CN 202210841373 A CN202210841373 A CN 202210841373A CN 115818678 A CN115818678 A CN 115818678A
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- equal
- light magnesium
- temperature
- slurry
- magnesium oxide
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- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 230000036571 hydration Effects 0.000 claims abstract description 10
- 238000006703 hydration reaction Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 230000035484 reaction time Effects 0.000 claims abstract description 5
- 238000001354 calcination Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims abstract description 4
- 230000032683 aging Effects 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 17
- 239000000706 filtrate Substances 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- 238000000197 pyrolysis Methods 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000012065 filter cake Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- 239000011268 mixed slurry Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000002210 silicon-based material Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a production process of high-quality light magnesium carbonate and light magnesium oxide, which comprises the following steps: s1: crushing, fine grinding and wet deferrization of serpentine to obtain serpentine slurry with Tfe of less than or equal to 0.5%; s2: the mixture is sent into a calciner after filter pressing and drying, is continuously calcined for 0.5 to 1 hour at the temperature of between 550 and 700 ℃, is sent into a hydration tank after being cooled and crushed, the temperature of the hydration tank is more than or equal to 65 ℃, the time is more than or equal to 1 hour, and the solid-to-liquid ratio of hydration slurry is 4:1, the stirring speed is more than or equal to 150r/min; s3: and cooling the hydrated slurry to keep the solid-to-liquid ratio at 10:1, feeding the mixture into an aging device Chi Jingzhi h, then feeding the mixture into a carbonizer, feeding CO2 through the bottom of the carbonizer, keeping the pressure at more than or equal to 0.25Mpa and the temperature at less than or equal to 30 ℃, and keeping the reaction time at 20Min; the method has the advantages of environmental protection, low calcination temperature, short reaction time, mild reaction conditions, high recovery rate and the like, and the production cost is suitable for industrial production.
Description
Technical Field
The invention particularly relates to a production process of high-quality light magnesium carbonate and light magnesium oxide.
Background
The production method of the light magnesium carbonate mainly adopts a carbonization method, and the process flow is as follows: the method is characterized in that limestone (or dolomite or magnesite) is roasted, crushed, emulsified, added with magnesium chloride for reaction, washed, carbonized, filter-pressed, pyrolyzed, thickened, filter-pressed, dried and crushed. However, the light magnesium carbonate produced by the method is not high in flatness, so that a production process of high-quality light magnesium carbonate and light magnesium oxide is provided to solve the problem.
Disclosure of Invention
The invention aims to provide a production process of high-quality light magnesium carbonate and light magnesium oxide, aiming at the defects of the prior art, and the production process of the high-quality light magnesium carbonate and the light magnesium oxide can well solve the problems.
In order to meet the requirements, the technical scheme adopted by the invention is as follows: provides a production process of high-quality light magnesium carbonate and light magnesium oxide, which comprises the following steps
The production process of the high-quality light magnesium carbonate and the light magnesium oxide has the advantages that:
the method has the advantages of environmental protection, low calcination temperature, short reaction time, mild reaction conditions, high recovery rate and the like, and the production cost is suitable for industrial production.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail with reference to specific embodiments below.
In the following description, references to "one embodiment," "an embodiment," "one example," "an example," etc., indicate that the embodiment or example so described may include a particular feature, structure, characteristic, property, element, or limitation, but every embodiment or example does not necessarily include the particular feature, structure, characteristic, property, element, or limitation. Moreover, repeated use of the phrase "in accordance with an embodiment of the present application" although it may possibly refer to the same embodiment, does not necessarily refer to the same embodiment.
Certain features that are well known to those skilled in the art have been omitted from the following description for the sake of simplicity.
According to one embodiment of the application, a production process of high-quality light magnesium carbonate and light magnesium oxide is provided, which comprises the following steps:
s1: crushing, fine grinding and wet deferrization of serpentine to obtain serpentine slurry with Tfe of less than or equal to 0.5 percent;
s2: after filter pressing and drying, the mixture is sent into a calciner, continuously calcined for 0.5 to 1 hour at the temperature of between 550 and 700 ℃, cooled and crushed, and then sent into a hydration tank, wherein the temperature of the hydration tank is more than or equal to 65 ℃, the time of the hydration tank is more than or equal to 1 hour, and the solid-to-liquid ratio of hydration slurry is 4:1, the stirring speed is more than or equal to 150r/min;
s3: and cooling the hydrated slurry to keep the solid-to-liquid ratio at 10:1, feeding the mixture into an aging device Chi Jingzhi h, then feeding the mixture into a carbonizer, feeding CO2 through the bottom of the carbonizer, keeping the pressure at more than or equal to 0.25Mpa and the temperature at less than or equal to 30 ℃, and keeping the reaction time at 20Min;
s4: then sending the mixed slurry into a filter press for solid-liquid separation, wherein the solid phase is a low-magnesium silicon material, the filtrate is precipitated and purified to ensure that the mass concentration of solid particles is less than one gram per cubic meter, the purified filtrate is sent into a pyrolysis furnace, the pyrolysis furnace is heated and boiled, and the boiling duration is more than or equal to 10min;
s5: transferring the hot slurry to a large-capacity sedimentation tank, standing, settling, concentrating and collecting a finished product;
according to an embodiment of the present application, the process for producing high-quality light magnesium carbonate and light magnesium oxide further comprises step S6 after step S5: and (3) delivering the concentrated solid phase into a filter press for dehydration, and drying the obtained filter cake at the temperature of less than or equal to 250 ℃ for more than or equal to 3 hours to obtain a light magnesium carbonate product.
According to an embodiment of the present application, the process for producing high quality light magnesium carbonate and light magnesium oxide further comprises step S7 after step S6: the filtrate enters a blending water tank for recycling, wherein a part of light magnesium carbonate is selected to be sent into a calcining furnace to be subjected to temperature of less than or equal to 800 ℃ and time of more than or equal to 2 hours, so that a light magnesium oxide product can be obtained, wherein the content of magnesium oxide is more than or equal to 92%, and the recovery rate is more than or equal to 40%.
The above-mentioned embodiments only show some embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the claims.
Claims (3)
1. The production process of high-quality light magnesium carbonate and light magnesium oxide is characterized by comprising the following steps of:
s1: crushing, fine grinding and wet deferrization of serpentine to obtain serpentine slurry with Tfe of less than or equal to 0.5%;
s2: the mixture is sent into a calciner after filter pressing and drying, is continuously calcined for 0.5 to 1 hour at the temperature of between 550 and 700 ℃, is sent into a hydration tank after being cooled and crushed, the temperature of the hydration tank is more than or equal to 65 ℃, the time is more than or equal to 1 hour, and the solid-to-liquid ratio of hydration slurry is 4:1, the stirring speed is more than or equal to 150r/min;
s3: and cooling the hydrated slurry to keep the solid-to-liquid ratio at 10:1, feeding the mixture into an aging device Chi Jingzhi h, then feeding the mixture into a carbonizer, feeding CO2 through the bottom of the carbonizer, keeping the pressure at more than or equal to 0.25Mpa and the temperature at less than or equal to 30 ℃, and keeping the reaction time at 20Min;
s4: then sending the mixed slurry into a filter press for solid-liquid separation, wherein the solid phase is a low-magnesium silicon material, the filtrate is precipitated and purified to ensure that the mass concentration of solid particles is less than one gram per cubic meter, the purified filtrate is sent into a pyrolysis furnace, the pyrolysis furnace is heated and boiled, and the boiling duration is more than or equal to 10min;
s5: and transferring the hot slurry to a large-capacity sedimentation tank, standing, settling, concentrating and collecting a finished product.
2. The process for producing high-quality light magnesium carbonate and light magnesium oxide according to claim 1, further comprising step S6 after step S5: and (3) delivering the concentrated solid phase into a filter press for dehydration, and drying the obtained filter cake at the temperature of less than or equal to 250 ℃ for more than or equal to 3 hours to obtain a light magnesium carbonate product.
3. The process for producing high quality light magnesium carbonate and light magnesium oxide according to claim 1, wherein: after step S6, step S7 is further included: the filtrate enters a blending water tank for recycling, wherein a part of light magnesium carbonate is selected to be sent into a calcining furnace to be subjected to temperature of less than or equal to 800 ℃ and time of more than or equal to 2 hours, so that a light magnesium oxide product can be obtained, wherein the content of magnesium oxide is more than or equal to 92%, and the recovery rate is more than or equal to 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841373.6A CN115818678A (en) | 2022-07-18 | 2022-07-18 | Production process of high-quality light magnesium carbonate and light magnesium oxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841373.6A CN115818678A (en) | 2022-07-18 | 2022-07-18 | Production process of high-quality light magnesium carbonate and light magnesium oxide |
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| Publication Number | Publication Date |
|---|---|
| CN115818678A true CN115818678A (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210841373.6A Pending CN115818678A (en) | 2022-07-18 | 2022-07-18 | Production process of high-quality light magnesium carbonate and light magnesium oxide |
Country Status (1)
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| CN (1) | CN115818678A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408043A (en) * | 2013-08-13 | 2013-11-27 | 中国地质大学（武汉） | Method for preparing high-purity magnesium oxide with serpentine as raw material |
| CN103910366A (en) * | 2014-04-17 | 2014-07-09 | 宁婷婷 | Method for preparing high-purity magnesium oxide by utilizing serpentinite |
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2022
- 2022-07-18 CN CN202210841373.6A patent/CN115818678A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408043A (en) * | 2013-08-13 | 2013-11-27 | 中国地质大学（武汉） | Method for preparing high-purity magnesium oxide with serpentine as raw material |
| CN103910366A (en) * | 2014-04-17 | 2014-07-09 | 宁婷婷 | Method for preparing high-purity magnesium oxide by utilizing serpentinite |
Non-Patent Citations (1)
| Title |
|---|
| 代厚全, 骆开均, 张万成: "从蛇纹石制备轻质碳酸镁和轻质氧化镁的扩试研究", 四川师范大学学报(自然科学版), no. 02, pages 193 * |
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