阅读说明：本技术 微波能焙烧菱镁矿石连续生产氧化镁和二氧化碳的装置 (Device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy ) 是由 何平 吕卫 于 2021-08-27 设计创作，主要内容包括：本发明涉及微波能焙烧菱镁矿石连续生产氧化镁和二氧化碳的装置,包括炉体、换热机构、微波源阵列；所述的炉体为不锈钢结构,从上至下分为原料段、焙烧段、成品段,炉体顶部设有二氧化碳收集口、进料口；原料段与焙烧段之间固定有上网板,焙烧段与成品段之间固定有下网板,吸波炉套上下两端分别与上网板、下网板固定连接,吸波炉套外部均匀固定连接有微波源阵列,用于为吸波炉套内的原料加热。本发明的优点是：设备结构简单,占地面积小,便于普及应用,实现连续化不间断生产,提高了生产效率。(The invention relates to a device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy, which comprises a furnace body, a heat exchange mechanism and a microwave source array; the furnace body is of a stainless steel structure and is divided into a raw material section, a roasting section and a finished product section from top to bottom, and a carbon dioxide collecting port and a feeding port are formed in the top of the furnace body; an upper screen plate is fixed between the raw material section and the roasting section, a lower screen plate is fixed between the roasting section and the finished product section, the upper end and the lower end of the wave-absorbing furnace sleeve are respectively and fixedly connected with the upper screen plate and the lower screen plate, and a microwave source array is uniformly and fixedly connected to the outside of the wave-absorbing furnace sleeve and used for heating the raw material in the wave-absorbing furnace sleeve. The invention has the advantages that: the equipment has simple structure and small occupied area, is convenient to popularize and apply, realizes continuous and uninterrupted production and improves the production efficiency.)

1. The device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite ore by microwave energy is characterized by comprising a furnace body, a heat exchange mechanism and a microwave source array;

the furnace body is of a stainless steel structure and is divided into a raw material section, a roasting section and a finished product section from top to bottom, and a carbon dioxide collecting port and a feeding port are formed in the top of the furnace body;

an upper screen plate is fixed between the raw material section and the roasting section, a lower screen plate is fixed between the roasting section and the finished product section, the upper end and the lower end of the wave-absorbing furnace sleeve are respectively and fixedly connected with the upper screen plate and the lower screen plate, and a microwave source array is uniformly and fixedly connected outside the wave-absorbing furnace sleeve and used for heating the raw material in the wave-absorbing furnace sleeve;

the heat exchange mechanism comprises a cooling device, a residual heat release pipeline and a residual heat recovery pipeline, the residual heat release pipeline is arranged on the raw material section, the residual heat recovery pipeline is arranged on the finished product section, the residual heat release pipeline and the residual heat recovery pipeline are connected with the cooling device, and the residual heat release pipeline is connected with the residual heat recovery pipeline.

2. The apparatus of claim 1, wherein the raw material section is vertically provided with a gas release pipe in the middle, the top of the gas release pipe corresponds to the carbon dioxide collecting port, and the bottom of the gas release pipe passes through the upper screen and extends into the wave-absorbing furnace sleeve.

3. The apparatus for continuous production of magnesium oxide and carbon dioxide by calcining magnesite with microwave energy according to claim 1, wherein a speed regulation plate inclining downwards is fixed in the wave-absorbing furnace sleeve.

4. The apparatus for continuous production of magnesium oxide and carbon dioxide by calcining magnesite with microwave energy according to claim 1, wherein the upper and lower screens are provided with through holes.

5. The apparatus for continuous production of magnesium oxide and carbon dioxide by calcining magnesite with microwave energy according to claim 4, wherein the arrangement density of the through holes of the upper mesh plate is greater than that of the through holes of the lower mesh plate.

6. The method for continuously producing magnesium oxide and carbon dioxide by roasting magnesite through microwave energy, which is realized by the device according to any one of claims 1 to 5, is characterized by comprising the following steps:

1) putting magnesite powder with the particle size less than or equal to 1mm into a raw material section in the furnace from a feeding hole;

2) the microwave source array heats the magnesite powder entering the roasting section through the wave-absorbing furnace sleeve, so that the inside and the outside of magnesite powder particles are simultaneously heated; the generated carbon dioxide gas is discharged and collected from a carbon dioxide collecting port; solid powder enters a finished product section through a lower mesh plate;

3) the solid powder is discharged from a discharge hole at the bottom of the furnace body and is collected by a magnesium oxide collecting bin.

7. The method for continuously producing magnesium oxide and carbon dioxide by roasting magnesite with microwave energy according to claim 6, wherein the residual heat release pipeline in step 1) preheats magnesite powder entering the raw material section; and 3, absorbing the heat of the solid powder at the finished product section by the waste heat recovery pipeline.

8. The method for continuously producing magnesium oxide and carbon dioxide by roasting magnesite with microwave energy according to claim 6, wherein the carbon dioxide generated in step 2) is discharged through a gas discharge pipe.

9. The method for continuous production of magnesium oxide and carbon dioxide by calcining magnesite with microwave energy according to claim 6, wherein the magnesite powder entering the wave-absorbing furnace jacket in the step 2) is adjusted by a speed adjusting plate to fall, so as to adjust the heating time of the magnesite powder.

Technical Field

The invention belongs to the technical field of metallurgy, and relates to a device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy.

Background

Magnesium oxide is an important inorganic chemical raw material and product, has a melting point of 2850 ℃ and a boiling point of 3600 ℃, and is an excellent raw material for manufacturing refractory materials. The physical and chemical properties of the magnesium oxide are greatly different due to different preparation processes, the magnesium oxide prepared under the condition of lower temperature has incomplete crystal structure development, fine crystal grains, small bulk density and unstable chemical properties, and can slowly react with water and carbon dioxide to produce magnesium hydroxide and basic magnesium carbonate to deteriorate when exposed in the air; the magnesium oxide obtained by high-temperature roasting has perfect crystal lattice development, compact and ordered arrangement, large crystal grains and very stable chemical property, and does not react with water or carbon dioxide, thereby having high fire resistance and insulation performance. Raw materials for producing the magnesium oxide can be simply divided into solid mineral resources, such as magnesite, dolomite, serpentine and other natural magnesium-containing minerals; and liquid mineral resources such as seawater, salt lake water, well brine and other magnesium-containing liquids. The production of the magnesium oxide mainly uses magnesium-containing minerals such as magnesite and the like, has simple process and low production cost, and can be used for large-scale batch production.

The main component of magnesite ore is MgCO₃In the prior art, magnesite ore is generally used as a raw material to produce magnesium oxide, the preparation process is complex, uneven heating exists in the preparation process, the cost is too high, and the problem of carbon dioxide emission exists.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy comprises a furnace body, a heat exchange mechanism and a microwave source array;

the furnace body is of a stainless steel structure and is divided into a raw material section, a roasting section and a finished product section from top to bottom, and a carbon dioxide collecting port and a feeding port are formed in the top of the furnace body;

an upper screen plate is fixed between the raw material section and the roasting section, a lower screen plate is fixed between the roasting section and the finished product section, the upper end and the lower end of the wave-absorbing furnace sleeve are respectively and fixedly connected with the upper screen plate and the lower screen plate, and a microwave source array is uniformly and fixedly connected outside the wave-absorbing furnace sleeve and used for heating the raw material in the wave-absorbing furnace sleeve;

the heat exchange mechanism comprises a cooling device, a residual heat release pipeline and a residual heat recovery pipeline, the residual heat release pipeline is arranged on the raw material section, the residual heat recovery pipeline is arranged on the finished product section, the residual heat release pipeline and the residual heat recovery pipeline are connected with the cooling device, and the residual heat release pipeline is connected with the residual heat recovery pipeline.

The middle of the raw material section is vertically provided with an air escape pipe, the top of the air escape pipe corresponds to the carbon dioxide collecting port, and the bottom of the air escape pipe penetrates through the upper screen plate and extends into the wave-absorbing furnace sleeve.

And a downward inclined speed regulating plate is fixed in the wave absorbing furnace sleeve.

The upper screen plate and the lower screen plate are provided with through holes.

The arrangement density of the through holes of the upper screen plate is greater than that of the through holes of the lower screen plate.

The method for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy comprises the following steps:

1) putting magnesite powder with the particle size less than or equal to 1mm into a raw material section in the furnace from a feeding hole;

2) the microwave source array heats the magnesite powder entering the roasting section through the wave-absorbing furnace sleeve, so that the inside and the outside of magnesite powder particles are simultaneously heated; the generated carbon dioxide gas is discharged and collected from a carbon dioxide collecting port; solid powder enters a finished product section through a lower mesh plate;

3) the solid powder is discharged from a discharge hole at the bottom of the furnace body and is collected by a magnesium oxide collecting bin.

In the step 1), the residual heat release pipeline preheats magnesite powder entering a raw material section; and 3, absorbing the heat of the solid powder at the finished product section by the waste heat recovery pipeline.

Discharging the carbon dioxide generated in the step 2) through the air discharging pipe.

The falling speed of the magnesite powder entering the wave-absorbing furnace sleeve in the step 2) is adjusted by the speed adjusting plate, so that the heating time of the magnesite powder is adjusted.

Compared with the prior art, the invention has the beneficial effects that:

the device has simple structure, small occupied area and convenient popularization and application, realizes continuous and uninterrupted production and improves the production efficiency. The temperature of the roasting section is controllable by adopting microwave heating, the temperature uniformity can be ensured, the stability is good, and the magnesite powder particles passing through the roasting section are simultaneously heated inside and outside, so that the roasting efficiency is greatly improved; the microwave leakage meets the national safety standard. The heat exchange mechanism realizes waste heat recycling, directly preheats magnesite powder of the raw material section, and realizes energy conservation. The carbon dioxide can be completely recovered, zero emission is realized, and the collected high-purity CO₂Can create higher additional economic value.

The magnesite powder falls from a discharge port of a raw material bin above a furnace body in a free falling mode, passes through a plurality of sections of roasting sections, falls into a magnesium oxide collecting bin at the bottom of the furnace, passes through a discharge port of the collecting bin, and is conveyed to a next production link by a conveying belt; and a large amount of high-temperature high-purity carbon dioxide gas generated in the roasting process passes through a raw material bin above the furnace body and is recovered by a carbon dioxide recovery device arranged at the top end of the furnace body, so that the aim of zero emission of carbon dioxide is fulfilled.

Drawings

FIG. 1 is a schematic diagram I of the structure of a device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy.

Fig. 2 is a schematic structural diagram II of a device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy.

Fig. 3 is a schematic structural diagram three of a device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy.

In the figure: 1-furnace body 2-raw material section 3-roasting section 4-finished product section 5-microwave source array 6-carbon dioxide collecting port 7-feed inlet 8-upper net plate 9-lower net plate 10-wave-absorbing furnace jacket 11-cooling device 12-waste heat releasing pipeline 13-waste heat recycling pipeline 14-discharge port 15-air leakage pipe 16-speed regulating plate.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.

Referring to fig. 1, the device for continuously producing magnesium oxide and carbon dioxide by roasting magnesite by microwave energy comprises a furnace body 1, a heat exchange mechanism and a microwave source array 5; the furnace body 1 is divided into a raw material section 2, a roasting section 3 and a finished product section 4 from top to bottom, and the top of the furnace body 1 is provided with a carbon dioxide collecting port 6 and a feeding port 7; an upper screen plate 8 is fixed between the raw material section 2 and the roasting section 3, a lower screen plate 9 is fixed between the roasting section 3 and the finished product section 4, the upper end and the lower end of the wave-absorbing furnace sleeve 10 are respectively and fixedly connected with the upper screen plate 8 and the lower screen plate 9, and a microwave source array 5 is uniformly and fixedly connected to the outer part of the wave-absorbing furnace sleeve 10 and used for heating the raw materials in the wave-absorbing furnace sleeve 10. The wave-absorbing furnace sleeve 10 can be made of the furnace sleeve wave-absorbing material disclosed in the Chinese patent CN 104926330A.

The heat exchange mechanism comprises a cooling device 11, a waste heat release pipeline 12 and a waste heat recovery pipeline 13, the waste heat release pipeline 12 is arranged on the raw material section 2, the waste heat recovery pipeline 13 is arranged on the finished product section 4, the waste heat release pipeline 12 and the waste heat recovery pipeline 13 are connected with the cooling device 11, and the waste heat release pipeline 12 is connected with the waste heat recovery pipeline 13. The residual heat release pipeline 12 and the residual heat recovery pipeline 13 can be arranged in a snake shape, cooling water is introduced into the pipeline, and the cooling device 11 provides cooling water circulation power outside the heat dissipation function.

Referring to fig. 2 and 3, the middle of the raw material section 2 is vertically provided with an air release pipe 15, the top of the air release pipe 15 corresponds to the carbon dioxide collecting port 6, and the bottom of the air release pipe penetrates through the upper screen plate 8 and extends into the wave-absorbing furnace sleeve 10. In addition, the air leakage pipe 15 also plays a role of preventing the magnesite powder from caking in a large area.

A downward inclined speed regulating plate 16 is fixed in the wave absorbing furnace sleeve 10, and the speed regulating plate can be made of a stainless steel screen plate and can be of a multi-section reciprocating structure, so that the stroke of magnesite powder is prolonged.

Through holes are arranged on the upper screen plate 8 and the lower screen plate 9, and the diameter of the through hole of the upper screen plate 8 can be different from that of the through hole of the lower screen plate 9. The upper screen plate 8 and the lower screen plate 9 can be made of stainless steel plates. The arrangement density of the through holes of the upper screen plate 8 is greater than that of the through holes of the lower screen plate 9, and the speed reduction of the magnesite powder in the wave-absorbing furnace sleeve 10 is adjusted according to the arrangement density ratio of the through holes of the upper screen plate 8 to the through holes of the lower screen plate 9.

Referring to fig. 1, the method for continuous production of magnesium oxide and carbon dioxide by roasting magnesite by microwave energy comprises the following steps:

1) magnesite powder with the grain diameter less than or equal to 1mm is freely dropped into a raw material section 2 in the furnace from a feed port 7; magnesite powder directly enters a wave-absorbing furnace sleeve 10 of the roasting section 3 through an upper net plate 8;

2) the microwave source array 5 heats the magnesite powder entering the roasting section 3 through the wave-absorbing furnace sleeve 10, so that the magnesite powder particles are heated inside and outside simultaneously; carbon dioxide gas generated in the roasting process passes through the raw material section 2 and is discharged, collected and recycled through the carbon dioxide collecting port 6, so that the aim of zero emission of carbon dioxide is fulfilled;

the solid powder enters the finished product section 4 through the lower mesh plate 9; the generated carbon dioxide is discharged through the upper mesh plate 8 or through the upper mesh plate 8 and the air discharge pipe 15, as shown in fig. 2.

3) The solid powder falls to a finished product section 4, waste heat is recovered, and finally the solid powder is discharged from a discharge hole 14 at the bottom of the furnace body 1, collected by a magnesium oxide collecting bin, and conveyed to the next production link by a conveying belt.

The residual heat release pipeline 12 preheats magnesite powder entering the raw material section 2; the waste heat recovery pipeline 13 absorbs the heat of the solid powder in the finished product section 4.

Referring to fig. 3, the method for continuous production of magnesium oxide and carbon dioxide by roasting magnesite by microwave energy comprises the following steps:

1) magnesite powder with the grain diameter less than or equal to 1mm is put into a raw material section 2 in the furnace from a feed inlet 7; magnesite powder enters a wave absorbing furnace sleeve 10 of the roasting section 3 through an upper net plate 8;

2) the microwave source array 5 heats the magnesite powder entering the roasting section 3 through the wave-absorbing furnace sleeve 10, so that the magnesite powder particles are heated inside and outside simultaneously; carbon dioxide gas generated in the roasting process passes through the raw material section 2 and is discharged, collected and recycled through the carbon dioxide collecting port 6, so that the aim of zero emission of carbon dioxide is fulfilled; the solid powder enters the finished product section 4 through the lower mesh plate 9; the generated carbon dioxide is discharged through the upper net plate 8 and the air discharging pipe 15. The falling speed of the magnesite powder entering the wave-absorbing furnace sleeve 10 is adjusted by the speed adjusting plate 16, and the heating time of the magnesite powder is further adjusted.

3) The solid powder falls to a finished product section 4, waste heat is recovered, and finally the solid powder is discharged from a discharge hole 14 at the bottom of the furnace body 1, collected by a magnesium oxide collecting bin, and conveyed to the next production link by a conveying belt.

The residual heat release pipeline 12 preheats magnesite powder entering the raw material section 2; the waste heat recovery pipeline 13 absorbs the heat of the solid powder in the finished product section 4.

The microwave energy intensity of different sections can be gathered and regulated to heat, the magnesite ore powder penetrating through the wave-absorbing furnace sleeve 10 is roasted to continuously produce active magnesium oxide, high-purity carbon dioxide is recycled, and the magnesium oxide is efficiently produced with energy conservation and without carbon dioxide emission. In different sections, the purpose of regulating and controlling the temperature of the sections is achieved by controlling the intensity of microwave energy; the material of the wave-absorbing furnace sleeve 10 has good high-temperature resistance, strong wave-absorbing performance and quick induced coupling reaction, so that the temperature in the wave-absorbing furnace sleeve 10 is quickly raised, the temperature uniformity can be ensured, and the stability is good; the ore powder particles passing through the roasting section 3 can be simultaneously heated inside and outside, thereby greatly improving the roasting efficiency.