CN110981227B - Magnesium oxide-based desulfurizing agent and preparation method thereof - Google Patents
Magnesium oxide-based desulfurizing agent and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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Abstract
The invention provides a magnesium oxide based desulfurizing agent and a preparation method thereof. The magnesium oxide based desulfurizer is prepared from the following raw materials: light-burned magnesium powder, a pore-forming agent and water; the light-burned magnesium powder is active light-burned magnesium powder with the magnesium oxide content of more than or equal to 75 percent, which is prepared by sintering low-grade magnesite with the magnesium oxide content of less than or equal to 43.0 percent in a suspension kiln. The magnesium oxide based desulfurizer provided by the invention uses low-grade magnesite with lower magnesium oxide content as a raw material, and high-activity light-burned magnesium powder obtained by sintering the raw material in a suspension kiln is mixed with a pore-forming agent and water, so that the obtained magnesium oxide based desulfurizer has a good desulfurization effect, and the problems of overhigh cost, large pollution emission and low desulfurization efficiency of the existing calcium based desulfurizer in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of waste treatment environment, and more particularly relates to a magnesium oxide based desulfurizing agent and a preparation method thereof.
Background
China probably has more than 90% of SO2The emissions result from the combustion of coal fuels, which poses a significant environmental hazard. Currently controlling SO2The main means of emission is to carry out desulfurization treatment on the flue gas by a desulfurizing agent. Among them, the most commonly used process is "calcium desulfurization", i.e., miningThe wet desulfurization is carried out by using lime, but the desulfurization product has no better treatment method. On the other hand, the magnesite industry in China adopts a relatively extensive production mode in recent years, the reflection kiln is a magnesite light-burning kiln which is the main kiln in Liaoning area of China at present, the quantity of the reflection kiln accounts for more than 99% of the quantity of the light-burning kiln, but technical equipment is quite laggard. Meanwhile, the low-grade magnesite tailings have low utilization rate and are mainly treated by adopting a stacking mode, and the treatment mode causes environmental pollution and resource waste.
The advantages of the magnesia-based desulfurizing agent are mainly reflected in three aspects: firstly, the source of magnesium oxide resources is wide, magnesite resources in China account for 28.85% of the total world reserves and live at the top of the world, wherein Liaoning magnesite reserves are most abundant, and the reserves account for 85.8% of the whole country; secondly, compared with a calcium-based desulfurizing agent, the magnesium oxide-based desulfurizing agent has higher desulfurizing efficiency; thirdly, the used magnesium oxide desulfurizer is easy to treat, the desulfurizer used in calcium desulphurization is often treated in a stacking mode, occupies space and pollutes the environment, but magnesium sulfate used in waste materials or building materials can be prepared after magnesium desulphurization. Therefore, the research on how to prepare the magnesia-based desulfurizer with high desulfurization efficiency by using the waste magnesite tailings as raw materials has positive and important significance for environmental protection and high-efficiency utilization of resources.
At present, the production of calcium-based desulfurizing agent is still the main method in the existing desulfurizing agent preparation technology. For example, chinese patent CN105327613A discloses a method for preparing a desulfurizing agent, the active ingredients of the raw materials are mainly dicalcium silicate and calcium olivine, the desulfurizing efficiency is improved by adding a catalytic component, the requirement of desulfurization is met, and the defects of low activity and low desulfurizing efficiency of quicklime are solved. The magnesium oxide desulfurizer adopted in the Chinese patent CN109351170A is prepared from light-burned magnesium oxide powder or light magnesium oxide powder with the activity of more than 90 percent, has the advantages of high desulfurization efficiency, wide resources, smooth operation, difficult blockage and the like, and can replace the existing calcium desulfurizer.
Because of the defects of the traditional calcium desulphurization, the magnesium desulfurizer gradually becomes a trend in order to reduce the waste of mineral resources to the maximum and promote the coordinated development of the desulfurizer and the resources. The magnesium-based desulfurizer prepared by the prior art basically takes high-activity magnesia powder (the content of active magnesia is more than or equal to 90 percent) as a main raw material, and the main method for preparing light-burned magnesia powder is to bake magnesite by a reflection kiln, wherein the magnesite baked by the reflection kiln has the defects of high energy consumption, unstable physicochemical property of the baked light-burned magnesia powder and the like. Meanwhile, the high-activity magnesia powder (the content of the active magnesia is more than or equal to 90 percent) has high price, and the cost defect causes the cost problem of the magnesia desulfurizer, so the magnesia desulfurizer can not replace calcium-based desulfurizer to be widely applied. Therefore, in order to promote the magnesium oxide-based desulfurizing agent, the excellences in the aspects of excellent desulfurization efficiency, simple desulfurization method and the like are highlighted, and the raw material production method and cost are problems to be solved urgently at present.
The main chemical component of magnesite is magnesium carbonate (MgCO)3) The method is mainly used for preparing refractory materials, extracting magnesium metal and the like. However, since the low-grade magnesite (tailings) cannot meet the requirements of other industrial production, most tailing resources in China are left unused in a large amount, so that waste on resources and space is caused, ecology is influenced, and pollution is caused. Therefore, the magnesium-based desulfurizer prepared from the light-burned magnesia powder prepared from the magnesite has positive significance for the green development of the desulfurizer in the future.
Disclosure of Invention
The invention aims to provide a magnesium oxide based desulfurizer which uses low-grade magnesite with lower magnesium oxide content as a raw material, and the raw material is sintered by a suspension kiln to obtain high-activity light-burned magnesium powder which is mixed with a pore-forming agent, so that the obtained magnesium oxide based desulfurizer has good desulfurization effect, and the problems of overhigh cost, large pollution emission and low desulfurization efficiency of the existing calcium based desulfurizer in the prior art are solved.
The magnesium oxide based desulfurizer provided by the invention is prepared from the following raw materials: light-burned magnesium powder, a pore-forming agent and water; the light-burned magnesium powder is active light-burned magnesium powder with the magnesium oxide content of more than or equal to 75 percent, which is prepared by sintering low-grade magnesite with the magnesium oxide content of less than or equal to 43.0 percent in a suspension kiln. Wherein, the percentages are weight percentages unless otherwise specified.
In the invention, the light-burned magnesia powder prepared by taking magnesite tailings as raw materials, pore-forming agent and water are innovatively found to be used as raw materials, and the obtained magnesia-based desulfurizing agent also has better desulfurization efficiency.
In a preferred embodiment of the invention, the citric acid method activity test time of the active light-burned magnesium powder is 15-20 s. In the invention, the light-burned magnesia powder prepared by taking magnesite tailings as raw materials is used, and the performance of the desulfurizer obtained by using the high-activity magnesia powder with high cost (the activity test time of the citric acid method is 10s) is almost the same as that of the desulfurizer obtained by using the light-burned magnesia powder with high activity and high activity by using the citric acid method, wherein the activity test time of the light-burned magnesia powder is 15-20 s.
In a preferred embodiment of the invention, the calcination temperature of the suspension kiln is 850-1100 ℃, and the calcination time is 30-50 min.
In a preferred embodiment of the present invention, the method for preparing the active light-burned magnesium powder with the magnesium oxide content of more than or equal to 75% is preferably as follows: taking low-grade magnesite with the magnesium oxide content of less than or equal to 43.0 percent as a raw material, carrying out ore wet grinding on 120-mesh slurry, adding a medicament, carrying out ore dressing, desiliconization and decalcification, carrying out flash evaporation drying on tailing slurry, calcining the slurry in a suspension kiln at 850-1100 ℃, and carrying out fine grinding on the slurry with the pass rate of 95 percent to obtain high-activity light-burned magnesia powder with the active magnesium oxide content of more than or equal to 75 percent.
In a preferred embodiment of the present invention, the magnesium oxide-based desulfurizing agent comprises the following raw materials in parts by weight: 400-600 parts of light-burned magnesium powder, 10-60 parts of pore-forming agent and 380-600 parts of water. More preferably 500 parts of light-burned magnesium powder, 20-50 parts of pore-forming agent and 480-520 parts of water.
In the present invention, pore-forming agent in the art may be pore-forming agent of the present invention, preferably one or more of sodium silicate, polyethylene glycol, and talc powder, more preferably talc powder.
In a preferred embodiment of the present invention, the magnesium oxide-based desulfurizing agent comprises the following raw materials in parts by weight: 500 parts of light-burned magnesium powder, 20-50 parts of pore-forming agent talcum powder and 480-520 parts of water.
In the present invention, the weight parts may be units of weight known in the art, such as μ g, mg, g, kg, etc., or multiples thereof, such as 1/10, 1/100, 10, 100, etc.
The magnesium oxide-based desulfurizing agent is preferably granular, and the average specific surface area of the granules is 450-500 m2/kg, preferably 475m2In terms of/kg. The average fineness of the magnesium oxide-based desulfurizing agent of the present invention is preferably 200 mesh.
Another object of the present invention is to provide a method for preparing the above magnesium oxide-based desulfurizing agent, comprising the steps of:
(1) taking magnesite tailings with the magnesia content of less than or equal to 43.0%, crushing, ball-milling, desiliconizing and decalcifying to obtain tailings slurry with the fineness of 120 meshes;
(2) drying the tailing slurry, feeding the tailing slurry into a suspension kiln, and calcining the tailing slurry in suspension at 850-1100 ℃ for 30-50 min to obtain active light-burned magnesia powder with the magnesia content being more than or equal to 75%;
(3) adding the active light-burned magnesia powder, the pore-forming agent and water according to the proportion and uniformly mixing to obtain the catalyst.
Wherein, a jaw crusher is used for crushing, the crushed materials are fed into a ball mill for ball milling, and medicaments commonly used in the field are added for desilication and decalcification.
Compared with the prior art, the invention has the beneficial effects that:
the magnesium oxide based desulfurizer prepared based on the magnesite tailings is prepared by taking light-burned magnesium oxide powder prepared by low-grade magnesite through a suspension kiln as a raw material and adding water and a pore-forming agent, the whole process flow realizes the reutilization of magnesite tailing resources and simultaneously develops a new application of the light-burned magnesium oxide powder of the magnesite tailings, the cost of the whole process flow is greatly reduced, and the national requirement on sustainable development is met; and the prepared desulfurizer has excellent performance, compared with a calcium method desulfurizer, the resource source is wide, the used desulfurizer is easy to treat, and the comprehensive and high-efficiency utilization of resources is really realized. Has profound influence on the future development of the magnesite industry and the future development trend of the desulfurizer.
The preparation method of the magnesium-based desulfurizer is based on low-activity magnesite tailings, and the prepared magnesium oxide desulfurizer has no obvious difference in performance compared with a desulfurizer prepared from high-activity light magnesium oxide powder through the comprehensive action of adding the pore-forming agent, and has better performance compared with a calcium desulfurizer. The main raw material of the desulfurizer prepared by the invention is composed of waste, thereby bringing good economic benefit and realizing the purposes of energy conservation and emission reduction.
Drawings
FIG. 1 is a flow chart of a process for preparing a magnesium oxide-based desulfurizing agent according to a preferred embodiment of the present invention;
FIG. 2 is a graph showing a particle size distribution of the activated soft-burned magnesium oxide powder of example 1.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are provided to illustrate the present invention, but are not intended to limit the scope of the present invention.
The raw material components used in the invention can be obtained commercially, and the reagents used in the embodiment of the invention are all chemically pure.
Example 1
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination for 50min at 1100 ℃ to obtain active light-burned magnesia powder (the activity determination time is 18 seconds by a citric acid method) with the fineness of 200 meshes of 95% and the activity of more than or equal to 75% (wherein, as shown in figure 2, the obtained active light-burned magnesia powder has uniform fineness distribution);
(3) and (3) adding 500 parts by weight of the active light-burned magnesia powder obtained in the step (2), 30 parts by weight of a pore-forming agent talcum powder and 500 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Example 2
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination at 850 ℃ for 30min to obtain active light-burned magnesia powder with the fineness of 200 meshes, the passing rate of 95 percent and the activity of more than or equal to 75 percent;
(3) and (3) adding 500 parts by weight of the active light-burned magnesia powder obtained in the step (2), 20 parts by weight of a pore-forming agent talcum powder and 480 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Example 3
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination for 50min at 1100 ℃ to obtain active light-burned magnesia powder with the fineness of 200 meshes and the passing rate of 95 percent and the activity of more than or equal to 75 percent;
(3) and (3) adding 500 parts by weight of the active light-burned magnesia powder obtained in the step (2), 50 parts by weight of a pore-forming agent talcum powder and 520 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Example 4
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination for 50min at 1100 ℃ to obtain active light-burned magnesia powder with the fineness of 200 meshes and the passing rate of 95 percent and the activity of more than or equal to 75 percent;
(3) adding 400 parts by weight of the active light-burned magnesia powder obtained in the step (2), 10 parts by weight of pore-forming agent talcum powder and 60 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Example 5
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination for 50min at 1100 ℃ to obtain active light-burned magnesia powder with the fineness of 200 meshes and the passing rate of 95 percent and the activity of more than or equal to 75 percent;
(3) adding 600 parts by weight of the active light-burned magnesia powder obtained in the step (2), 60 parts by weight of a pore-forming agent talcum powder and 600 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Example 6
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination for 50min at 1100 ℃ to obtain active light-burned magnesia powder with the fineness of 200 meshes and the passing rate of 95 percent and the activity of more than or equal to 75 percent;
(3) and (3) adding 500 parts by weight of the active light-burned magnesia powder obtained in the step (2), 30 parts by weight of pore-forming agent sodium silicate and 500 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Example 7
The embodiment provides a magnesium oxide based desulfurizing agent, and the preparation method of the magnesium oxide based desulfurizing agent comprises the following steps:
(1) taking magnesite tailings with the magnesium oxide content of less than or equal to 43.0%, crushing by using a jaw crusher, feeding the crushed magnesite tailings into a ball mill for ball milling, and adding a medicament for desiliconization and decalcification to obtain tailings slurry with the fineness of 120 meshes;
(2) feeding the tailing slurry into a flash evaporation dryer through a raw material feeder for drying, feeding the dried powder into a suspension kiln, and performing suspension calcination for 50min at 1100 ℃ to obtain active light-burned magnesia powder with the fineness of 200 meshes and the passing rate of 95 percent and the activity of more than or equal to 75 percent;
(3) and (3) adding 500 parts by weight of the active light-burned magnesia powder obtained in the step (2), 30 parts by weight of pore-forming agent polyethylene glycol and 500 parts by weight of water, and uniformly mixing to prepare the magnesia-based desulfurizer. The magnesium oxide-based desulfurizing agent prepared in this example had an average fineness of 200 mesh and an average specific surface area of 475m2/kg。
Comparative example 1
This comparative example provides a magnesia-based desulfurizing agent which is prepared in the same manner as in example 1 except that calcination is carried out in step (2) using a reverberatory kiln.
Comparative example 2
The comparative example provides a magnesium oxide-based desulfurizing agent, and the preparation method comprises the following steps:
500 parts by weight of light-burned magnesia powder (the content of magnesia is more than 95 percent, the activity test time of a citric acid method is 10 seconds), 30 parts by weight of pore-forming agent talcum powder and 500 parts by weight of water are mixed to prepare the magnesia-based desulfurizer.
Comparative example 3
The comparative example provides a desulfurizing agent, and the preparation method comprises the following steps:
500 parts by weight of calcium oxide, 30 parts by weight of pore-forming agent talcum powder and 500 parts by weight of water are mixed to prepare the calcium oxide-based desulfurizer.
Experimental example 1
The activity, daily output, heat rate and product uniformity of the activated soft-burned magnesium oxide powders obtained in step (2) of example 1 and comparative example 1 were compared, and the results are shown in Table 1 below.
Table 1 performance results for activated lightly calcined magnesia in example 1 and comparative example 1
From the above table 1, it can be seen that the output of the light-burned magnesia powder produced by putting low-grade magnesite into the suspension kiln can be improved by about 10 times, the energy consumption is saved by 50%, and the production efficiency and the output are improved.
Experimental example 2
The desulfurizer prepared in the embodiments 1 to 7 and the comparative examples 1 to 3 is used for flue gas desulfurization, the contact time of the desulfurizer and the flue gas is 2 seconds, parameters such as flue gas flow, temperature and the like are controlled, the same section and the height of a desulfurizer frame are selected, and the condition that the reaction contact area of the flue gas and the desulfurizer is consistent is met. The desulfurization rates and the utilization effects of the above-mentioned desulfurizing agents were compared, and the test results are shown in Table 2 below.
TABLE 2 results of the tests on the properties of the examples and comparative desulfurizing agents
As can be seen from the data in Table 2, the difference between the performance of the magnesium oxide based desulfurizer of the invention and the performance of the desulfurizer (comparative example 2) prepared from high-activity magnesium oxide powder on the market (the content of magnesium oxide is more than 95%, and the activity test time of the citric acid method is 10 seconds) is less than 2%, compared with the traditional calcium method desulfurizer, the desulfurization effect is better, and the desulfurization product can be reasonably recovered.
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The magnesium oxide based desulfurizer is characterized by being prepared from the following raw materials: light-burned magnesium powder, a pore-forming agent and water; the light-burned magnesium powder is active light-burned magnesium powder with the magnesium oxide content of more than or equal to 75 percent, which is prepared by sintering low-grade magnesite with the magnesium oxide content of less than or equal to 43.0 percent in a suspension kiln, wherein the calcination temperature of the suspension kiln is 850-1100 ℃, and the calcination time is 30-50 min;
the activity of the active light-burned magnesium powder is measured by a citric acid method, the activity test time is 15-20 s, and the fineness of the light-burned magnesium powder is 200 meshes;
the raw materials comprise the following components in parts by weight: 400-600 parts of light-burned magnesium powder, 10-60 parts of pore-forming agent and 380-600 parts of water;
the pore-forming agent is one or more of sodium silicate, polyethylene glycol and talcum powder.
2. The magnesium oxide-based desulfurizing agent according to claim 1, wherein the active light-burned magnesium powder has an activity test time of 18s by citric acid method.
3. The magnesium oxide based desulphurating agent according to claim 1, wherein said raw materials are: 500 parts of light-burned magnesium powder, 20-50 parts of pore-forming agent and 480-520 parts of water.
4. The magnesium oxide based desulphurating agent according to claim 1, wherein said pore-forming agent is talc.
5. The magnesium oxide-based desulfurizing agent according to claim 1, wherein the magnesium oxide-based desulfurizing agent is in the form of particles, and the average specific surface area of the particles is 450 to 500m2/kg。
6. The method for preparing a magnesium oxide based desulphurating agent according to any one of claims 1 to 5, comprising the steps of:
(1) taking magnesite tailings with the magnesia content of less than or equal to 43.0%, crushing, ball-milling, desiliconizing and decalcifying to obtain tailings slurry with the fineness of 120 meshes;
(2) drying the tailing slurry, feeding the tailing slurry into a suspension kiln, and calcining the tailing slurry in suspension at 850-1100 ℃ for 30-50 min to obtain active light-burned magnesia powder with the magnesia content being more than or equal to 75%;
(3) adding the active light-burned magnesia powder, the pore-forming agent and water according to the proportion and uniformly mixing to obtain the catalyst.
Priority Applications (1)
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| CN112516780A (en) * | 2020-10-27 | 2021-03-19 | 蒲城驭腾新材料科技有限公司 | Calcium-based desulfurizer and preparation method thereof |
| CN112551921B (en) * | 2020-11-25 | 2022-06-07 | 海城远东矿业有限公司 | Carbonization activation beneficiation technology for high-silicon magnesite |
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| KR20140111195A (en) * | 2013-03-08 | 2014-09-18 | 주식회사 포스코 | Low-heat cement composition including desulfurization slag and blast furnace slag |
| CN106082715A (en) * | 2016-06-06 | 2016-11-09 | 辽宁洁镁科技有限公司 | Magnesite is used to prepare method and the application of gained magnesium oxide of light calcined magnesia |
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