CN117720288A - Preparation process of special magnesium oxide - Google Patents
Preparation process of special magnesium oxide Download PDFInfo
- Publication number
- CN117720288A CN117720288A CN202311712618.6A CN202311712618A CN117720288A CN 117720288 A CN117720288 A CN 117720288A CN 202311712618 A CN202311712618 A CN 202311712618A CN 117720288 A CN117720288 A CN 117720288A
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- China
- Prior art keywords
- converter
- magnesium oxide
- temperature
- heating
- ore blocks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 56
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 15
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 15
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 15
- 238000010304 firing Methods 0.000 claims abstract description 11
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 239000011777 magnesium Substances 0.000 claims abstract description 11
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000012216 screening Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 238000001354 calcination Methods 0.000 abstract description 13
- 239000003380 propellant Substances 0.000 abstract description 11
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a preparation process of special magnesium oxide, which relates to the technical field of special magnesium oxide preparation and comprises the following steps: crushing magnesite, processing into a plurality of ore blocks, screening ore blocks with high magnesium content, further crushing, setting the initial rotating speed of a converter, starting the converter, preheating, pouring the ore blocks into the converter, continuously heating the converter, closing the converter, stopping heating when the temperature and the heating time of the converter reach the requirements, finishing the first firing of magnesium oxide after the converter is cooled to the ambient temperature, resetting the rotating speed of the converter, starting the converter, heating, closing the converter, stopping heating when the temperature and the heating time of the converter reach the requirements, cooling the converter to the ambient temperature, taking out the repeatedly fired special magnesium oxide, mixing and bagging to finish the preparation of the special magnesium oxide. The invention adopts the repeated calcination method, and the prepared magnesia has higher catalytic performance, thereby improving the combustion performance of the double-base propellant.
Description
Technical Field
The invention relates to the technical field of special magnesium oxide preparation, in particular to a preparation process of special magnesium oxide.
Background
The magnesium biaryl type double-based propellant is a traditional double-based propellant, and a certain number of market demands are still maintained to date; magnesium oxide is used as an important raw material in the double-aromatic magnesium type double-base propellant, plays roles of catalysis and combustion stabilization, and determines the ballistic performance of the propellant.
The magnesium oxide preparation method mainly comprises a brine ammonium carbonate preparation method, a secondary carbonization method, a sea water precipitation method, a chemical synthesis method, a magnesite carbonization preparation method and the like, wherein the main production method of magnesium oxide in China is to chemically purify semi-finished products after calcining magnesite powder, and remove Fe, al, ca and other impurities in the semi-finished products, so that the purity of magnesium oxide in the products is greatly improved, the content of magnesium oxide can reach more than 99%, but the catalytic activity of magnesium oxide treated by the chemical method is reduced, the magnesium oxide has limited effect of adjusting the burning rate after being hydrated and is added into a propellant, the use requirement of the products cannot be met, and the traditional magnesium oxide firing method must be broken. Based on the design, the preparation process of the special magnesium oxide adopts a repeated calcination method, the whole process is simpler and quicker, and the prepared magnesium oxide has higher catalytic performance, so that the combustion performance of the double-base propellant is improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preparation process of special magnesium oxide, wherein the whole process is simpler and quicker by adopting a repeated calcination method, and the prepared magnesium oxide has higher catalytic performance, so that the combustion performance of a double-base propellant is improved, and the use requirement of a double-aromatic magnesium double-base propellant product is met.
The aim of the invention is realized by the following technical scheme: a process for preparing special magnesium oxide, comprising the following steps:
s1, crushing magnesite, and processing the magnesite into a plurality of ore blocks.
S2, screening ore blocks, and screening ore blocks with high magnesium content.
S3, further crushing the screened ore blocks until the particle size is 80-120 mu m, wherein the aim of facilitating calcination is mainly achieved, the calcination area is increased, and the calcination efficiency is improved.
S4, setting the initial rotating speed of the converter, starting the converter, preheating, and pouring the further crushed ore blocks into the converter when the temperature of the converter rises to 380 ℃.
S5, continuously heating the converter, closing the converter and stopping heating when the temperature of the converter reaches 850-950 ℃ and the heating time is more than or equal to 8 hours, and completing the first firing of the magnesia after the converter is cooled to the ambient temperature.
S6, resetting the revolving speed of the converter, starting the converter and heating, closing the converter and stopping heating when the temperature of the converter reaches 850-950 ℃ and the temperature rising time is more than or equal to 8 hours, and cooling the converter to the ambient temperature.
And S7, taking out the repeatedly fired special magnesium oxide, mixing and bagging to finish the preparation of the special magnesium oxide.
Preferably, in the step S1, magnesite is crushed and processed into a plurality of ore pieces having a size of 150-250 mm.
Preferably, in the step S2, ore blocks are screened, and ore blocks with magnesium content not less than 42% are screened.
Preferably, in the step S4, the initial rotation speed of the converter is set to 400-450 rpm, the converter is started and preheated, and when the temperature of the converter is raised to 380 ℃, the further crushed ore blocks are poured into the converter.
Preferably, in the step S6, the revolving speed of the converter is reset to 350-400 rpm, the converter is started and heated, and when the temperature of the converter reaches 850-950 ℃ and the temperature rising time is more than or equal to 8 hours, the converter is closed and the temperature rising is stopped, and the converter is cooled to the ambient temperature. The heating time is controlled to 8 hours or more because the heating rate cannot be too fast, and if the heating rate is too fast, the larger the specific surface area of MgO particles, incomplete, distorted and defective grains are caused, and regular grains are not produced. When the sample is taken to carry out Thermogravimetric (TG) analysis on magnesite, the mass is reduced to 0.72% when the firing temperature reaches about 850-950 ℃, which means that the magnesite is basically decomposed completely without raising the firing temperature, so the firing temperature is set as follows: 850-950 ℃.
The beneficial effects of the invention are as follows:
the invention adopts the repeated calcination method, the whole process is simpler and quicker, and the prepared magnesia has higher catalytic performance, thereby improving the combustion performance of the double-base propellant and meeting the use requirement of double-aromatic magnesium double-base propellant products.
Drawings
FIG. 1 is a diagram of a specific magnesium oxide embodiment;
fig. 2 is a SEM image of special magnesium oxide.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
The invention is further described with reference to the drawings and specific examples.
Example 1:
as shown in fig. 1 to 2, a preparation process of special magnesium oxide includes the following steps:
s1, crushing magnesite, and processing into a plurality of ore blocks with the size of about 200 mm.
S2, screening ore blocks, and screening ore blocks with magnesium content more than or equal to 42%. If the magnesium content of magnesite is less than 42%, the magnesium oxide content in the produced special magnesium oxide is less than 85%, the product requirement cannot be met, and the magnesium oxide content required by the special magnesium oxide is more than or equal to 85%.
S3, further crushing the screened ore blocks until the particle size is 120 mu m, wherein the aim of facilitating calcination is mainly achieved, the calcination area is increased, and the calcination efficiency is improved.
S4, setting the initial rotating speed of the converter to be 400r/h, starting the converter, preheating, and pouring the further crushed ore blocks into the converter when the temperature of the converter rises to 380 ℃. When magnesite is heated, the magnesite is generally decomposed at about 350-380 ℃ and emits CO2 to generate MgO, so that the preheating temperature is set to 380 ℃.
S5, continuously heating the converter, closing the converter and stopping heating when the temperature of the converter reaches 900 ℃ and the heating time reaches 8.5h, and completing the first firing of the magnesium oxide after the converter is cooled to the ambient temperature. The first firing adopts a mode of rotating the converter and heating at the same time, so that the ore blocks in the converter are heated more uniformly.
S6, resetting the revolving speed of the revolving furnace to 350r/h, starting the revolving furnace and heating, closing the revolving furnace and stopping heating when the revolving furnace temperature reaches 900 ℃ and the heating time reaches 8h, and cooling the revolving furnace to the ambient temperature. The repeated firing stage realizes the control of the loss on ignition of the magnesia by controlling the revolving speed of the revolving furnace, and according to the table 1, the loss on ignition of the magnesia meets the technical requirements when the revolving speed is 350-400 r/h.
TABLE 1
And S7, taking out the repeatedly fired special magnesium oxide, mixing and bagging to finish the preparation of the special magnesium oxide.
In the prior art, magnesium oxide is prepared by chemical treatment, and the magnesium oxide treated by the chemical method and the magnesium oxide prepared by a repeated calcination method are respectively sampled and analyzed, and the comparison result is shown in Table 2.
Table 2, comparison of test results of chemical and repeated calcination methods for the preparation of magnesium oxide
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. A preparation process of special magnesium oxide is characterized in that: the method comprises the following steps:
s1, crushing magnesite, and processing the magnesite into a plurality of ore blocks;
s2, screening ore blocks, and screening ore blocks with high magnesium content;
s3, further crushing the screened ore blocks until the particle size is 80-120 mu m;
s4, setting an initial rotating speed of the converter, starting the converter, preheating, and pouring the ore blocks after further crushing into the converter when the temperature of the converter rises to 380 ℃;
s5, continuously heating the converter, closing the converter and stopping heating when the temperature of the converter reaches 850-950 ℃ and the heating time is more than or equal to 8 hours, and completing the first firing of the magnesia after the converter is cooled to the ambient temperature;
s6, resetting the revolving speed of the converter, starting the converter and heating, closing the converter and stopping heating when the temperature of the converter reaches 850-950 ℃ and the temperature rising time is more than or equal to 8 hours, and cooling the converter to the ambient temperature;
and S7, taking out the repeatedly fired special magnesium oxide, mixing and bagging to finish the preparation of the special magnesium oxide.
2. The process for preparing the special magnesium oxide according to claim 1, wherein the process comprises the following steps: in the step S1, magnesite is crushed and processed into a plurality of ore blocks with the size of 150-250 mm.
3. The process for preparing the special magnesium oxide according to claim 1, wherein the process comprises the following steps: in the step S2, ore blocks are screened, and ore blocks with the magnesium content of more than or equal to 42% are screened.
4. The process for preparing the special magnesium oxide according to claim 1, wherein the process comprises the following steps: in the step S4, the initial rotating speed of the converter is set to be 400-450 r/h, the converter is started and preheated, and after the temperature of the converter rises to 380 ℃, the further crushed ore blocks are poured into the converter.
5. The process for preparing special magnesium oxide according to claim 4, wherein: setting the initial rotating speed of the converter to 400 revolutions per hour, starting the converter and preheating, pouring the further crushed ore blocks into the converter when the temperature of the converter rises to 380 ℃, continuously heating the converter, closing the converter and stopping heating when the temperature of the converter reaches 900 ℃ and the heating time reaches 8.5 hours, and finishing the first firing of the magnesium oxide after the converter is cooled to the ambient temperature.
6. The process for preparing the special magnesium oxide according to claim 1, wherein the process comprises the following steps: in the step S6, the revolving speed of the revolving furnace is reset to 350-400 revolutions per hour, the revolving furnace is started and heated, when the revolving furnace temperature reaches 850-950 ℃ and the temperature rising time is more than or equal to 8 hours, the revolving furnace is closed and the temperature rising is stopped, and the revolving furnace is cooled to the ambient temperature.
7. The process for preparing special magnesium oxide according to claim 6, wherein: setting the revolving speed of the converter to 350r/h again, opening the converter and heating, closing the converter and stopping heating when the temperature of the converter reaches 900 ℃ and the heating time reaches 8h, and cooling the converter to the ambient temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311712618.6A CN117720288A (en) | 2023-12-13 | 2023-12-13 | Preparation process of special magnesium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311712618.6A CN117720288A (en) | 2023-12-13 | 2023-12-13 | Preparation process of special magnesium oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117720288A true CN117720288A (en) | 2024-03-19 |
Family
ID=90202850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311712618.6A Pending CN117720288A (en) | 2023-12-13 | 2023-12-13 | Preparation process of special magnesium oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117720288A (en) |
-
2023
- 2023-12-13 CN CN202311712618.6A patent/CN117720288A/en active Pending
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