CN110698083A - Process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite - Google Patents
Process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite Download PDFInfo
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- CN110698083A CN110698083A CN201911131704.1A CN201911131704A CN110698083A CN 110698083 A CN110698083 A CN 110698083A CN 201911131704 A CN201911131704 A CN 201911131704A CN 110698083 A CN110698083 A CN 110698083A
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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
Abstract
The invention discloses a process for producing fused magnesia by directly floating powdery middlings of low-grade magnesite, and particularly relates to the field of fused magnesia processing, which specifically comprises the following steps: the method comprises the following steps: collecting raw materials, and step two: preparing a modified starch adhesive, and step three: stirring and mixing, and step four: high-pressure balling, step five: drying the balls, and the sixth step: and (5) melting the round balls, and the seventh step: and (5) molding. The method collects the direct flotation powdery middlings produced by flotation of the low-grade magnesite, utilizes the magnesite balls produced by the powdery middlings to process and produce the dead burned magnesite, and the finally prepared dead burned magnesite can reach the performance of high-purity magnesite in performance, so that the magnesite balls can replace magnesite lump ores and serve as raw materials of the dead burned magnesite, the direct flotation powdery middlings produced by production of the dead burned magnesite from the low-grade magnesite can be secondarily utilized, a new way is opened for application of the powdery middlings, resources are saved, and the service life of a mine is prolonged.
Description
Technical Field
The invention relates to the technical field of fused magnesite processing, in particular to a process for producing fused magnesite by directly floating powdery middlings of low-grade magnesite.
Background
In recent years, with the maturity of magnesite flotation technology, a large amount of low-grade magnesite is applied, and a large amount of direct flotation middlings are generated along with the application of the low-grade magnesite. In order to efficiently utilize mineral resources and comprehensively utilize the mineral resources, the fused magnesia is prepared by melting selected special grade a natural magnesite or high-purity light-burned magnesium particles in an electric arc furnace. The product has high purity, large crystal grains, compact structure, strong slag resistance and good thermal shock stability, is an excellent high-temperature electrical insulating material, and is also an important raw material for manufacturing high-grade magnesia bricks, magnesia carbon bricks and unshaped refractory materials.
The raw materials of the electric melting magnesite are all superior magnesite lump ores, and the magnesium ore balls obtained by the method can completely replace the superior magnesite lump ores. The powdery tailings obtained by the direct flotation of the low-grade magnesite not only can be applied, but also saves resources and prolongs the service life of the mine.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the invention provides a process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite, the direct flotation powdery middlings produced by flotation of the low-grade magnesite are collected, and the magnesite balls produced by the powdery middlings are used for processing and producing dead burned magnesite, so that the performance of the dead burned magnesite finally prepared can reach the performance of high-purity magnesite, and the magnesite balls can replace magnesite lump ores and serve as dead burned magnesite raw materials, so that the direct flotation powdery middlings produced during production of dead burned magnesite by low-grade magnesite can be secondarily utilized, a new way is opened up for application of the powdery middlings, resources are saved, and the service life of a mine is prolonged.
In order to achieve the purpose, the invention provides the following technical scheme: a process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite comprises the following steps:
the method comprises the following steps: collecting raw materials, wherein magnesite is blocky and has low taste, purifying the magnesite by a flotation method, introducing the raw materials to generate three varieties, and taking direct flotation powdery middlings as the raw materials;
step two: preparing a modified starch adhesive, wherein the modified starch adhesive comprises 20-30 parts of modified starch, 3-9 parts of sodium hydroxide, 3-9 parts of mullite micropowder, 10-20 parts of borax, 2-5 parts of an anhydrous resin binder, 2-5 parts of polyvinyl alcohol and 30-40 parts of water, adding the polyvinyl alcohol into the water, stirring and heating to 80 ℃ to completely dissolve the polyvinyl alcohol, stirring for 20 minutes, cooling to 50 ℃, adding the modified starch, preserving heat for 1 hour to perform graft modification, then adding the sodium hydroxide, stirring, adding the mullite micropowder, the borax and the anhydrous resin binder, mixing for 40 hours, and finally uniformly stirring;
step three: stirring and mixing, namely placing the powdery middlings prepared in the step one in a stirrer with automatic temperature rise, adding powdery silicon into the stirrer, then adding the modified starch adhesive into the stirrer, raising the temperature of the inside of the stirrer to 40 ℃, stirring the powdery middlings and the powdery middlings by the stirrer at a temperature higher than room temperature, and keeping the mixing time for 10-20 minutes to prepare a mixture;
step four: high-pressure balling, conveying the mixture prepared in the step three to the inside of a ball press, and pressing the mixture by the ball press by adopting a special die so as to form a spherical shape;
step five: drying the round balls, namely placing the pressed round balls in a drying room, heating the drying room by using a hot air blower in the drying room, directly blowing hot air flow blown out by the hot air blower on the surfaces of the round balls, and drying at the temperature of 100 ℃ for 5-8 hours;
step six: melting the round balls, taking the dried round balls out of the drying room, and transporting the round balls to an electric melting furnace for melting by using a conveyor belt, wherein the melting temperature of the electric melting furnace is kept at 2000-3000 ℃, and the melting time is kept at 8-10 hours;
step seven: and (4) molding, and finally preparing the fused magnesia.
In a preferred embodiment, in the second step, the mullite micropowder, the borax and the anhydrous resin binder are added in the order of mullite micropowder, borax and anhydrous resin binder.
In a preferred embodiment, the powdered silicon in step three is free of larger silicon particle impurities.
In a preferred embodiment, the round balls pressed in the fourth step are directly dropped onto a buffer belt for transportation, so as to ensure the integrity of the round balls.
In a preferred embodiment, the drying room in the fifth step is blown by multiple sets of fans synchronously to drive the air inside the drying room to flow.
In a preferred embodiment, in the sixth step, the flue gas generated in the melting process in the electric melting furnace is directly introduced into the combustion chamber for combustion.
In a preferred embodiment, the fused magnesite in the seventh step is subjected to mass weighing and classification.
The invention has the technical effects and advantages that:
1. according to the invention, the direct flotation powdery middlings generated by flotation of the low-grade magnesite are collected, the magnesite balls produced by the powdery middlings are utilized for processing and producing the dead burned magnesite, and the finally prepared dead burned magnesite can reach the performance of high-purity magnesite in performance, so that the magnesite balls can replace magnesite lump ores and serve as raw materials of the dead burned magnesite, the direct flotation powdery middlings generated in the process of producing the dead burned magnesite by the low-grade magnesite can be secondarily utilized, a new way is developed for application of the powdery middlings, resources are saved, and the service life of a mine is prolonged;
2. according to the invention, the mullite micropowder, the borax and the anhydrous resin bonding agent are added into the components of the modified starch adhesive, and the mullite micropowder, the borax and the anhydrous resin bonding agent have high adaptivity and stability, so that after interaction, the stability of the fused magnesia is effectively improved, and the service life of the fused magnesia is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite comprises the following steps:
the method comprises the following steps: collecting raw materials, wherein magnesite is blocky and has low taste, purifying the magnesite by a flotation method, introducing the raw materials to generate three varieties, and taking direct flotation powdery middlings as the raw materials;
step two: preparing a modified starch adhesive, wherein the modified starch adhesive comprises 20 parts of modified starch, 3 parts of sodium hydroxide, 3 parts of mullite micropowder, 10 parts of borax, 2 parts of an anhydrous resin bonding agent, 2 parts of polyvinyl alcohol and 30 parts of water, adding the polyvinyl alcohol into the water, stirring and heating to 80 ℃, completely dissolving the polyvinyl alcohol, stirring for 20 minutes, cooling to 50 ℃, adding the modified starch, preserving the temperature for 1 hour for graft modification, then adding the sodium hydroxide, stirring, adding the mullite micropowder, the borax and the anhydrous resin bonding agent, mixing for 40 hours, and finally uniformly stirring;
step three: stirring and mixing, namely placing the powdery middlings prepared in the step one in a stirrer with automatic temperature rise, adding powdery silicon into the stirrer, wherein the powdery silicon does not contain large silicon particle impurities, then adding a modified starch adhesive into the stirrer, raising the temperature of the stirrer to 40 ℃, stirring the powdery middlings and the stirrer at the temperature higher than room temperature, and keeping the mixing time for 10 minutes to prepare a mixture;
step four: high-pressure balling, conveying the mixture prepared in the third step to the inside of a ball press, pressing the mixture by the ball press by adopting a special die to form a ball shape, and directly dropping the pressed ball on a buffer belt for transmission so as to ensure the integrity of the ball;
step five: drying the round balls, namely placing the pressed round balls in a drying room, heating the drying room by using a hot air blower in the drying room, directly blowing hot air flow blown out by the hot air blower on the surfaces of the round balls, drying at the temperature of 100 ℃, and keeping the drying time for 5 hours, wherein the inside of the drying room is synchronously blown by a plurality of groups of fans to drive the air in the drying room to flow;
step six: the dried round balls are taken out of the drying room and conveyed to an electric melting furnace by a conveyor belt for burning, wherein the melting temperature of the electric melting furnace is kept at 2000 ℃, the melting time is kept at 8 hours, and in addition, flue gas generated in the melting process in the electric melting furnace is directly introduced into a combustion chamber for combustion;
step seven: and (4) molding, finally preparing the fused magnesia, weighing the fused magnesia by mass, and classifying the fused magnesia.
Example 2:
a process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite comprises the following steps:
the method comprises the following steps: collecting raw materials, wherein magnesite is blocky and has low taste, purifying the magnesite by a flotation method, introducing the raw materials to generate three varieties, and taking direct flotation powdery middlings as the raw materials;
step two: preparing a modified starch adhesive, wherein the modified starch adhesive comprises 15 parts of modified starch, 5 parts of sodium hydroxide, 5 parts of mullite micropowder, 15 parts of borax, 3 parts of an anhydrous resin bonding agent, 3 parts of polyvinyl alcohol and 35 parts of water, adding the polyvinyl alcohol into the water, stirring and heating to 80 ℃, completely dissolving the polyvinyl alcohol, stirring for 20 minutes, cooling to 50 ℃, adding the modified starch, preserving the temperature for 1 hour for graft modification, then adding the sodium hydroxide, stirring, adding the mullite micropowder, the borax and the anhydrous resin bonding agent, mixing for 40 hours, and finally uniformly stirring;
step three: stirring and mixing, namely placing the powdery middlings prepared in the step one in a stirrer with automatic temperature rise, adding powdery silicon into the stirrer, wherein the powdery silicon does not contain large silicon particle impurities, then adding a modified starch adhesive into the stirrer, raising the temperature of the stirrer to 40 ℃, stirring the powdery middlings and the stirrer at the temperature higher than room temperature, and keeping the mixing time for 15 minutes to prepare a mixture;
step four: high-pressure balling, conveying the mixture prepared in the third step to the inside of a ball press, pressing the mixture by the ball press by adopting a special die to form a ball shape, and directly dropping the pressed ball on a buffer belt for transmission so as to ensure the integrity of the ball;
step five: drying the round balls, namely placing the pressed round balls in a drying room, heating the drying room by using a hot air blower in the drying room, directly blowing hot air flow blown out by the hot air blower on the surfaces of the round balls, drying at the temperature of 100 ℃, and keeping the drying time for 6 hours, wherein the inside of the drying room is synchronously blown by a plurality of groups of fans to drive the air in the drying room to flow;
step six: the dried round balls are taken out of the drying room and conveyed to an electric melting furnace by a conveyor belt for burning, wherein the melting temperature of the electric melting furnace is kept at 2500 ℃, the melting time is kept at 9 hours, and in addition, flue gas generated in the melting process in the electric melting furnace is directly introduced into a combustion chamber for combustion;
step seven: and (4) molding, finally preparing the fused magnesia, weighing the fused magnesia by mass, and classifying the fused magnesia.
Example 3:
a process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite comprises the following steps:
the method comprises the following steps: collecting raw materials, wherein magnesite is blocky and has low taste, purifying the magnesite by a flotation method, introducing the raw materials to generate three varieties, and taking direct flotation powdery middlings as the raw materials;
step two: preparing a modified starch adhesive, wherein the modified starch adhesive comprises 30 parts of modified starch, 9 parts of sodium hydroxide, 9 parts of mullite micropowder, 20 parts of borax, 5 parts of an anhydrous resin bonding agent, 5 parts of polyvinyl alcohol and 40 parts of water, adding the polyvinyl alcohol into the water, stirring and heating to 80 ℃, completely dissolving the polyvinyl alcohol, stirring for 20 minutes, cooling to 50 ℃, adding the modified starch, preserving the temperature for 1 hour for graft modification, then adding the sodium hydroxide, stirring, adding the mullite micropowder, the borax and the anhydrous resin bonding agent, mixing for 40 hours, and finally uniformly stirring;
step three: stirring and mixing, namely placing the powdery middlings prepared in the step one in a stirrer with automatic temperature rise, adding powdery silicon into the stirrer, wherein the powdery silicon does not contain large silicon particle impurities, then adding a modified starch adhesive into the stirrer, raising the temperature of the stirrer to 40 ℃, stirring the powdery middlings and the stirrer at the temperature higher than room temperature, and keeping the mixing time for 20 minutes to prepare a mixture;
step four: high-pressure balling, conveying the mixture prepared in the third step to the inside of a ball press, pressing the mixture by the ball press by adopting a special die to form a ball shape, and directly dropping the pressed ball on a buffer belt for transmission so as to ensure the integrity of the ball;
step five: drying the round balls, namely placing the pressed round balls in a drying room, heating the drying room by using a hot air blower in the drying room, directly blowing hot air flow blown out by the hot air blower on the surfaces of the round balls, drying at the temperature of 100 ℃, and keeping the drying time at 8 hours, wherein the inside of the drying room is synchronously blown by a plurality of groups of fans to drive the air in the drying room to flow;
step six: the dried round balls are taken out of the drying room and conveyed to an electric melting furnace by a conveyor belt for burning, wherein the melting temperature of the electric melting furnace is kept at 3000 ℃, the melting time is kept at 10 hours, and in addition, flue gas generated in the melting process in the electric melting furnace is directly introduced into a combustion chamber for combustion;
step seven: and (4) molding, finally preparing the fused magnesia, weighing the fused magnesia by mass, and classifying the fused magnesia.
Twenty parts of fused magnesite prepared in the above examples 1 to 3 were respectively prepared for each group, and sixty parts in total, and the fused magnesite was subjected to performance tests, so that the following data were obtained:
| amount of fused magnesite | Content of magnesium oxide | Average degree of high temperature resistance and no deformation | The case of fused magnesite (as opposed to ordinary times) | |
| Example 1 | 20 | Greater than 92% | 50％ | The deformation is more obvious |
| Example 2 | 20 | More than 96 percent | 34％ | The deformation is relatively insignificant |
| Example 3 | 20 | Greater than 90 percent | 46％ | The deformation is more obvious |
As can be seen from the above table, in example 2, the raw material mixing ratio is moderate, the forward flotation powdery middlings produced by flotation of low-grade magnesite are collected, the magnesite balls produced from the powdery middlings are used for processing and producing the dead burned magnesite, and the performance of the dead burned magnesite finally prepared can reach the performance of high-purity magnesite, so that the magnesite balls can replace magnesite lump ores and serve as raw materials of the dead burned magnesite, the forward flotation powdery middlings produced during production of the dead burned magnesite from low-grade magnesite can be reused, a new way is opened up for application of the powdery middlings, resources are saved, and the service life of the mine is prolonged.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. A process for producing fused magnesia by direct flotation of powdery middlings of low-grade magnesite is characterized by comprising the following steps: the method specifically comprises the following steps:
the method comprises the following steps: collecting raw materials, wherein magnesite is blocky and has low taste, purifying the magnesite by a flotation method, introducing the raw materials to generate three varieties, and taking direct flotation powdery middlings as the raw materials;
step two: preparing a modified starch adhesive, wherein the modified starch adhesive comprises 20-30 parts of modified starch, 3-9 parts of sodium hydroxide, 3-9 parts of mullite micropowder, 10-20 parts of borax, 2-5 parts of an anhydrous resin binder, 2-5 parts of polyvinyl alcohol and 30-40 parts of water, adding the polyvinyl alcohol into the water, stirring and heating to 80 ℃ to completely dissolve the polyvinyl alcohol, stirring for 20 minutes, cooling to 50 ℃, adding the modified starch, preserving heat for 1 hour to perform graft modification, then adding the sodium hydroxide, stirring, adding the mullite micropowder, the borax and the anhydrous resin binder, mixing for 40 hours, and finally uniformly stirring;
step three: stirring and mixing, namely placing the powdery middlings prepared in the step one in a stirrer with automatic temperature rise, adding powdery silicon into the stirrer, then adding the modified starch adhesive into the stirrer, raising the temperature of the inside of the stirrer to 40 ℃, stirring the powdery middlings and the powdery middlings by the stirrer at a temperature higher than room temperature, and keeping the mixing time for 10-20 minutes to prepare a mixture;
step four: high-pressure balling, conveying the mixture prepared in the step three to the inside of a ball press, and pressing the mixture by the ball press by adopting a special die so as to form a spherical shape;
step five: drying the round balls, namely placing the pressed round balls in a drying room, heating the drying room by using a hot air blower in the drying room, directly blowing hot air flow blown out by the hot air blower on the surfaces of the round balls, and drying at the temperature of 100 ℃ for 5-8 hours;
step six: melting the round balls, taking the dried round balls out of the drying room, and transporting the round balls to an electric melting furnace for melting by using a conveyor belt, wherein the melting temperature of the electric melting furnace is kept at 2000-3000 ℃, and the melting time is kept at 8-10 hours;
step seven: and (4) molding, and finally preparing the fused magnesia.
2. The process for producing fused magnesite by direct flotation of powdery middlings of low-grade magnesite according to claim 1, is characterized by comprising the following steps: in the second step, the mullite micropowder, the borax and the anhydrous resin binder are added in sequence.
3. The process for producing fused magnesite by direct flotation of powdery middlings of low-grade magnesite according to claim 1, is characterized by comprising the following steps: the powdered silicon in step three does not contain larger silicon particle impurities.
4. The process for producing fused magnesite by direct flotation of powdery middlings of low-grade magnesite according to claim 1, is characterized by comprising the following steps: the round balls pressed and formed in the fourth step directly fall onto the buffer belt for transmission, so that the integrity of the round balls is ensured.
5. The process for producing fused magnesite by direct flotation of powdery middlings of low-grade magnesite according to claim 1, is characterized by comprising the following steps: and in the fifth step, the drying room is internally blown synchronously by a plurality of groups of fans to drive the air in the drying room to flow.
6. The process for producing fused magnesite by direct flotation of powdery middlings of low-grade magnesite according to claim 1, is characterized by comprising the following steps: in the sixth step, the flue gas generated in the melting process in the electric melting furnace is directly introduced into the combustion chamber for combustion.
7. The process for producing fused magnesite by direct flotation of powdery middlings of low-grade magnesite according to claim 1, is characterized by comprising the following steps: and seventhly, weighing the fused magnesite by mass and classifying the fused magnesite.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111302672A (en) * | 2020-04-13 | 2020-06-19 | 鞍山盈丰新材料科技有限公司 | Processing raw material of fused magnesia and preparation method thereof |
| CN112094106A (en) * | 2020-08-19 | 2020-12-18 | 辽宁东和新材料股份有限公司 | Preparation method of large-crystal magnesia with low silicon dioxide content |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406196A (en) * | 2013-08-16 | 2013-11-27 | 辽宁东和耐火材料集团有限公司 | Multi-stage segmental ore-dressing, purifying, and comprehensive utilization method for low-grade magnesite |
| CN106186740A (en) * | 2016-07-12 | 2016-12-07 | 海城市恒镁科技有限公司 | A kind of method utilizing magnesite concentrate one one-step baking highly-purity magnesite |
| CN107354297A (en) * | 2016-05-09 | 2017-11-17 | 华东理工大学 | A kind of compound binding agent and the powder pelletizing obtained by the compound binding agent |
| CN110040987A (en) * | 2019-04-16 | 2019-07-23 | 大连地拓环境科技有限公司 | A kind of method that magnesite flotation tailing prepares caustic-calcined magnesite |
-
2019
- 2019-11-19 CN CN201911131704.1A patent/CN110698083B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406196A (en) * | 2013-08-16 | 2013-11-27 | 辽宁东和耐火材料集团有限公司 | Multi-stage segmental ore-dressing, purifying, and comprehensive utilization method for low-grade magnesite |
| CN107354297A (en) * | 2016-05-09 | 2017-11-17 | 华东理工大学 | A kind of compound binding agent and the powder pelletizing obtained by the compound binding agent |
| CN106186740A (en) * | 2016-07-12 | 2016-12-07 | 海城市恒镁科技有限公司 | A kind of method utilizing magnesite concentrate one one-step baking highly-purity magnesite |
| CN110040987A (en) * | 2019-04-16 | 2019-07-23 | 大连地拓环境科技有限公司 | A kind of method that magnesite flotation tailing prepares caustic-calcined magnesite |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111302672A (en) * | 2020-04-13 | 2020-06-19 | 鞍山盈丰新材料科技有限公司 | Processing raw material of fused magnesia and preparation method thereof |
| CN112094106A (en) * | 2020-08-19 | 2020-12-18 | 辽宁东和新材料股份有限公司 | Preparation method of large-crystal magnesia with low silicon dioxide content |
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