CN210089394U - Melting furnace - Google Patents
Melting furnace Download PDFInfo
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- CN210089394U CN210089394U CN201920784342.5U CN201920784342U CN210089394U CN 210089394 U CN210089394 U CN 210089394U CN 201920784342 U CN201920784342 U CN 201920784342U CN 210089394 U CN210089394 U CN 210089394U
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Abstract
The utility model provides a melting furnace, which uses a grid plate to divide the interior of the melting furnace into a drying section, a deamination section and a melting section from top to bottom; the top of the melting furnace is a single-slope top; inclined tower plates which are arranged in a staggered manner are respectively and independently arranged in the drying section and the deamination section, one end of each inclined tower plate is fixed on the furnace wall of the melting furnace, and the other end of each inclined tower plate is suspended to enable materials to pass through; a second air outlet connected with an induced draft fan is arranged on one side of the deamination section, which is close to the drying section, and the induced draft flow is adjusted through a valve arranged on a connecting pipeline; and a burner is arranged in the melting section. Melting furnace compact structure, the material is heated at melting furnace internal homogeneous stability, makes drying, the deamination of ammonium metavanadate material and melts and go on in drying section, deamination section and melting section independently respectively, uses the utility model provides a when melting furnace production vanadium pentoxide, the vanadium rate of recovery is more than 99%.
Description
Technical Field
The utility model belongs to the technical field of vanadium chemical production, a melting furnace is related to.
Background
Vanadium pentoxide is one of basic products of vanadium, and is ammonium polyvanadate obtained by performing the procedures of raw material preparation, roasting, leaching, precipitation and the like on a vanadium-containing raw material. And then melting and casting the ammonium polyvanadate to obtain a flaky vanadium pentoxide product. The melting process is the end process in the vanadium pentoxide production process and is also a very important link, and the operation level and the equipment state during melting directly influence the recovery rate of vanadium.
The loss of vanadium in the melting process mainly comprises volatilization loss caused by higher temperature and entrainment loss caused by furnace gas. The melting process of ammonium polyvanadate mainly comprises electric furnace melting and reverberatory furnace melting, wherein reverberatory furnace melting is to finish dehydration, deamination and melting cast sheet in a furnace at one time, the process is simple, but the temperature fluctuation in the melting furnace is large, thereby bringing fluctuation of vanadium recovery rate.
The research of Wangxiang et al (analysis and countermeasure of vanadium loss in the melting process of ammonium polyvanadate, Sichuan nonferrous metal, 2006, 12.35-39) shows that vanadium is firstly dehydrated, decomposed and deaminated in a heating furnace, wherein ammonia gas generated by decomposition and deamination reduces part of vanadium pentoxide into vanadium suboxide, part of the vanadium suboxide is combined with oxygen in the furnace to be converted into vanadium pentoxide, the solubility of the vanadium pentoxide is increased along with the reduction of the valence state of the vanadium, for example, the melting point of the vanadium pentoxide is 670 ℃, the melting point of the vanadium tetraoxide is as high as 1545 ℃, and the recovery rate of the vanadium is influenced and the purity of the vanadium pentoxide is prepared.
Moreover, after the vanadium pentoxide is melted, the vapor pressure of the vanadium pentoxide rises linearly along with the rise of the temperature, and the vapor pressure is particularly obvious when the temperature is more than 1000 ℃; and the ammonium polyvanadate is changed into powder after being dehydrated, and is all powder vanadium pentoxide before 670 ℃ after being deaminated, and the powder vanadium pentoxide has low relative density, is easy to be pumped out by furnace gas and easily causes furnace gas loss.
In order to reduce the vanadium loss and improve the vanadium recovery rate, CN 102616848A discloses a production method of vanadium pentoxide and a production system thereof, the method carries out the processes of drying, dehydration, calcination, deamination and melting of ammonium polyvanadate in three sets of equipment, and controls the temperature, the retention time of furnace charge and the oxygen supply atmosphere according to different functional sections of drying, deamination and oxidation, thereby leading each functional section to be carried out under the optimal condition. Li Wen Hui (ammonium polyvanadate melting three-step process technology transformation, 23 th national iron alloy academic seminar proceedings, 217-221) also researches the three-step process, and the three-step process completes drying, decomposition and melting in three different devices, thereby avoiding the occurrence of reduction reaction and the formation of vanadium hydration reaction, reducing the melting temperature, reducing the volatilization of vanadium and improving the recovery rate of vanadium pentoxide. But the excessive equipment increases the investment cost, and the occupied area is large, and the heat utilization rate is not high.
CN 106745250A discloses a device for oxidizing powdery vanadium pentoxide and a production method of flaky vanadium pentoxide, and the device comprises a hollow furnace body and a lower cylinder body arranged below the furnace body, wherein the lower cylinder body is connected with the furnace body, the top of the furnace body is provided with a furnace cover, a plurality of oxidation separation plates which are parallel to each other are arranged in the furnace body from top to bottom, holes for materials to pass through are arranged on the separation plates, the top of the furnace body is provided with a feed inlet, the feed inlet is connected with the feed inlet through a material conveying device, the device utilizes the feed inlet arranged at the top of the furnace body, an air furnace arranged at the bottom of the furnace body, and materials are in countercurrent contact with high-temperature gas, so that the materials enter the furnace body from top to be in contact with waste heat for heating, the heat utilization rate is high, but the device.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a melting furnace, this melting furnace of continuous production vanadium pentoxide's simple structure, area is little, and dry dehydration, deamination and melting through making ammonium metavanadate go on in the three region in melting the stove to the heat that every region produced is utilized to the theory, and energy utilization is high.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a melting furnace uses the grid board will the internal partitioning of melting furnace is for from last drying section, deamination section and the section of melting extremely down.
The furnace top of the melting furnace is a single-slope top, the feeding hole is arranged on the higher side of the single-slope top, the first exhaust port is arranged at the lower end of the single-slope top, and the discharge hole is arranged at the bottom of the melting furnace;
the drying section and the deamination section are respectively and independently provided with inclined tower plates which are arranged in a staggered manner, one end of each inclined tower plate is fixed on the furnace wall of the melting furnace, and the other end of each inclined tower plate is suspended to enable materials to pass through.
One side of the deamination section, which is close to the drying section, is provided with a second air outlet connected with an induced draft fan, and the induced draft flow is adjusted through a valve arranged on a connecting pipeline.
And a burner is arranged in the melting section.
Melting furnace used when preparing vanadic anhydride for melting ammonium metavanadate, ammonium metavanadate can dewater in a large number when 100 ℃, deamination in a large number and deamination completely when 425 ℃ about 280 ℃, begin to melt when 670 ℃. In order to reduce the volatilization loss during melting as much as possible, it is necessary to stably control the melting temperature to 900 ℃ or less.
The melting furnace is internally provided with two layers of grid plates, the interior of the melting furnace is divided into a drying section, a deamination section and a melting section from top to bottom, ammonium metavanadate materials enter from a feed inlet of a single-slope top of the melting furnace, dehydration drying is carried out on a cut-inclined tower plate of the drying section, and the heat of the dehydration drying comes from tail gas heat exchange and heat radiation of the deamination section; the dehydrated and dried ammonium metavanadate slides to a deamination section under the fluctuation of airflow and is deaminated under the heat generated by a melting section; and melting the generated vanadium pentoxide powder in a melting furnace, discharging through a discharge port, and cooling to obtain vanadium flakes.
Be provided with the second gas vent in the deamination section, the second gas vent links to each other with the draught fan, and through the induced air volume of the temperature regulation draught fan in the drying section to prevent the high temperature in the drying section, make ammonium metavanadate decompose and produce ammonia and produce likepowder vanadic anhydride, the condition of ammonia reduction vanadic anhydride not only can appear, still can increase the tail gas and smuggle the vanadium loss who causes secretly.
Melting section in the melting furnace is provided with the nozzle, passes through nozzle spun flame radiation heat transfer, makes powder vanadium pentoxide melt. The stable combustion of nozzle blowout flame can maintain the stability of melting the interior temperature of section, and then guarantees the temperature stability of deaminizing section and drying section.
The fixing method for fixing one end of the inclined tower plate to the furnace wall of the melting furnace comprises but not limited to conventional fixing methods such as welding, riveting or flange connection, and the like, and the technical personnel in the field can reasonably select the fixing method according to the requirement of the treatment capacity of the melting furnace and the material strength.
Preferably, be provided with 2-8 blocks of slope column plates in the dry section, for example can be 2, 3, 4, 5, 6, 7 or 8, the column plate that slope column plate was arranged for the slope in the dry section, can make the material constantly move down under the action of gravity, can guarantee the heating time to the material again, but too much slope column plate needs great tower height, increases equipment investment cost, still can cause the area of melting furnace too big, consequently the utility model discloses be provided with 2-8 fast slope column plates in the dry section, preferably 2-4, further preferred 3.
Preferably, the angle of inclination of the inclined trays in the drying section is from 5 to 20 °, which may be, for example, 5 °, 6 °, 7 °, 8 °, 9 °, 10 °, 11 °, 12 °, 13 °, 14 °, 15 °, 16 °, 17 °, 18 °, 19 ° or 20 °. When the angle of slope column plate is undersize, can't guarantee that the material moves down under the action of gravity, cause the piling up of a large amount of materials to make the production process obstructed, too big inclination not only can cause the dwell time of material too short, still can occupy a large amount of furnace space, causes the increase of equipment investment, consequently, the inclination of slope column plate is 5-20 in the dry section, preferred 8-15.
Preferably, be provided with 2-6 blocks of slope column plates in the deamination section, for example can be 2, 3, 4, 5 or 6, the tower plate that inclines in the deamination section was arranged for the slope can make the material constantly move down under the action of gravity, can guarantee the heat time to the material again, but too much slope column plate needs great tower height, increases equipment investment cost, still can cause the area of melting furnace too big, consequently the utility model discloses be provided with 2-6 fast slope column plates in the dry section, preferably 3-5, further preferred 4.
Preferably, the inclination angle of the inclined tower plate in the deamination section is 5-20 degrees. For example, it may be 5 °, 6 °, 7 °, 8 °, 9 °, 10 °, 11 °, 12 °, 13 °, 14 °, 15 °, 16 °, 17 °, 18 °, 19 °, or 20 °. When the angle undersize of slope column plate, can't guarantee that the material moves down under the action of gravity, cause the piling up of a large amount of materials to make the production process obstructed, too big inclination not only can cause the dwell time of material too short, still can occupy a large amount of furnace space, causes the increase of equipment investment, consequently, the inclination of slope column plate is 5-20 in the deamination section, preferred 8-15.
Preferably, the inclined tower plate is provided with through holes for gas to pass through. High-temperature gas's density is lower, has gathered in the contained angle of slope column plate and furnace body, though can be through the heat-conduction with the column plate come the heat transfer heating material, but efficiency is lower, and sets up the through-hole that supplies gaseous passing through on the slope column plate, can not only utilize gaseous material that turns over, makes material thermally equivalent, can also improve heat conduction efficiency to even discharge the ammonia that produces in the messenger deamination section, in order to prevent ammonia reduction powder vanadium pentoxide.
In addition, after a part of high-temperature gas is cooled in an included angle between the inclined tower plate and the furnace body, the entrained powder vanadium pentoxide can fall back; and the rest of high-temperature gas passing through the through holes can mix the entrained powder vanadium pentoxide with the materials due to the pressure drop of the high-temperature gas.
The entrained powder vanadium pentoxide can also be in the included angle between the inclined tower plate and the furnace body
Preferably, the slope of the single-slope top is 15-30 °. For example, it may be 15 °, 16 °, 17 °, 18 °, 19 °, 20 °, 21 °, 22 °, 23 °, 24 °, 25 °, 26 °, 27 °, 28 °, 29 °, or 30 °. The ammonium metavanadate material is added from the lower end of the single-slope top, and the high-temperature gas is gathered at the higher end of the single-slope top and is discharged from the first exhaust port.
Preferably, a combustion gas pipeline and a combustion-supporting gas pipeline are arranged in the burner, and the combustion-supporting gas pipeline is arranged in the combustion gas pipeline. The utility model discloses used nozzle comprises combustion gas pipeline and combustion-supporting gas pipeline, and wherein the combustion-supporting gas pipeline sets up in the inside of combustion gas pipeline, and above-mentioned this can make combustion-supporting gas and combustion gas homogeneous mixing to it is stable to make nozzle spun flame burning.
Preferably, the combustion gas comprises converter gas and/or propane gas, preferably propane gas, the calorific value of the propane gas is high, and oxygen required by the combustion of the propane gas is less, so that the stability of combustion can be ensured, the working condition of a melting section in the melting furnace is stable, and the working condition of the whole melting furnace is further ensured to be stable.
Preferably, the combustion supporting gas comprises air and/or oxygen, preferably oxygen. Preferably, the combustion supporting gas is in excess. Melting furnace during operation, there is a large amount of ammonia in the deaminizing section, and is excessive through making combustion-supporting gas to guarantee to contain a large amount of oxidizing gas in the high-temperature gas that rises from the melting section, not only can obstruct the ammonia to the oxidation of powder vanadic anhydride, can also be with being oxidized again by the vanadium oxide of reduction for vanadic anhydride, and then guarantee the rate of recovery of vanadium.
Preferably, the combustion gas pipeline and the combustion-supporting gas pipeline are respectively and independently provided with an adjusting valve, and the opening degree of the adjusting valve is adjusted according to the temperature in the combustion section so as to maintain the temperature in the combustion section stable and not more than 900 ℃.
Preferably, the grid plate is a grid plate composed of condensation pipes. Required temperature is different in dry section and the deamination section, in order to maintain the stability of each section temperature, separates used grid board with condenser pipe group component, and the refrigerant can be rationally selected according to the technology needs.
Preferably, one end of the second exhaust port is connected with the induced draft fan, the other end of the second exhaust port extends into the deamination section from the furnace wall of the melting furnace, one end of the deamination section extends into the deamination section is a bevel pipe, and the bevel face of the bevel pipe faces towards the melting section.
Preferably, a filter screen is arranged on the oblique cutting plane of the oblique cutting pipe. The utility model discloses a filter screen retrieves the powder vanadium pentoxide that smugglies secretly in the second gas vent gas of flowing through, has improved the vanadium rate of recovery.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the melting furnace provided by the utility model has compact structure, the furnace top of the melting furnace is set as a single slope top, and the inclined tower plates are independently and alternately arranged in the drying section and the deamination section respectively, so that the material is uniformly and stably heated in the melting furnace, and the heating time of the material is ensured, thereby the drying, deamination and melting of the ammonium metavanadate material are independently carried out in the drying section, the deamination section and the melting section respectively;
(2) melting furnace is through arranging dry section, deamination section and melting section from the top down in proper order, makes the heat that the combustion gas burning produced utilize layer upon layer, and energy utilization efficiency is high, uses the utility model provides a during melting furnace production vanadic anhydride, the vanadium rate of recovery is more than 99%.
Drawings
Fig. 1 is a schematic structural view of a melting furnace provided in example 1.
Wherein: 1, a feed inlet; 2, a first exhaust port; 3, a melting section; 4, deamination section; 5, a drying section; 6, a grid plate; 7, burning a burner; 8, a second exhaust port.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The utility model provides a melting furnace, the melting furnace uses grid plate 6 will the internal partitioning of melting furnace is for from last drying section 5, deamination section 4 and melting section 3 extremely down.
The furnace top of the melting furnace is a single-slope top with the gradient of 15-30 degrees, the feed inlet 1 is arranged on the higher side of the single-slope top, the first exhaust port 2 is arranged at the lower end of the single-slope top, and the discharge port is arranged at the furnace bottom of the melting furnace.
The drying section 5 and the deamination section 4 are respectively and independently provided with inclined tower plates which are arranged in a staggered manner, one end of each inclined tower plate is fixed on the furnace wall of the melting furnace, the other end of each inclined tower plate is suspended to enable materials to pass through, 2-8 inclined tower plates with the inclination angle of 5-20 degrees are arranged in the drying section 5, 2-6 inclined tower plates with the inclination angle of 5-20 degrees are arranged in the deamination section 4, and the inclined tower plates are provided with through holes for gas to pass through.
One side of the deamination section 4 close to the drying section 5 is provided with a second air outlet 8 connected with an induced draft fan, and the induced draft flow is adjusted through a valve arranged on a connecting pipeline.
A burner 7 is arranged in the melting section 3, a combustion gas pipeline and a combustion-supporting gas pipeline are arranged in the burner 7, and the combustion-supporting gas pipeline is arranged in the combustion gas pipeline.
The hydrous ammonium metavanadate material is added from the feed inlet 1, and is moved downwards in a staggered manner on the inclined tower plates arranged in a staggered manner under the action of gravity, and the hydrous ammonium metavanadate material is largely dehydrated in the drying section 5 by controlling the temperature of the drying section 5; then, the dehydrated ammonium metavanadate material moves downwards to a deamination section 4, the temperature in the deamination section 4 is higher than that in the drying section 5, the dehydrated ammonium metavanadate is deaminated, and the deaminated gas is used for maintaining the stability of the temperature in the drying section 5; the deaminized powder vanadium pentoxide is stably melted in the melting section 3, and high-temperature gas generated by melting is used for maintaining the stability of the temperature of the deaminizing section 4.
Furthermore, the grid plate 6 is the grid plate 6 that comprises the condenser pipe, and the refrigerant in the condenser pipe can be rationally selected according to the technology needs, and the setting of grid plate 6 can prevent the temperature surge in deaminizing section 4 and drying section 5 to guarantee the stability of the interior operating mode of melting furnace.
Furthermore, 8 one end of second gas vent is connected with the draught fan, and the other end by the oven of melting furnace stretches into deamination section 4, the one end of stretching into deamination section 4 is the scarf, and the scarf of scarf orientation of scarf pipe melts section 3, be provided with the filter screen on the scarf of scarf pipe. The filtering energy can recover powder vanadium pentoxide carried in the gas flowing through the second exhaust port 8.
Example 1
The embodiment provides a melting furnace, the structure of which is schematically shown in fig. 1, and the melting furnace uses a grid plate 6 consisting of condensation pipes to divide the interior of the melting furnace into a drying section 5, a deamination section 4 and a melting section 3 from top to bottom.
The furnace top of the melting furnace is a single-slope top with the gradient of 30 degrees, the feed inlet 1 is arranged on the higher side of the single-slope top, the first exhaust port 2 is arranged at the lower end of the single-slope top, and the discharge port is arranged at the furnace bottom of the melting furnace.
The drying section 5 and the deamination section 4 are respectively and independently provided with inclined tower plates which are arranged in a staggered manner, one end of each inclined tower plate is fixed on the furnace wall of the melting furnace, the other end of each inclined tower plate is suspended to enable materials to pass through, 8 inclined tower plates with the inclination angles of 5 degrees are arranged in the drying section 5, 6 inclined tower plates with the inclination angles of 5 degrees are arranged in the deamination section 4, and the inclined tower plates are provided with gas passing through holes.
One side of the deamination section 4 close to the drying section 5 is provided with a second air outlet 8 connected with an induced draft fan, and the induced draft flow is adjusted through a valve arranged on a connecting pipeline.
A burner 7 is arranged in the melting section 3, a combustion gas pipeline and a combustion-supporting gas pipeline are arranged in the burner 7, and the combustion-supporting gas pipeline is arranged in the combustion gas pipeline.
Example 2
This example provides a melting furnace, and compared with example 1, the present example is the same as example 1 except that the inclined trays in the drying section 5 are removed into 6 pieces and are re-staggered so that the inclination angle of the inclined trays is 10 °.
Example 3
This example provides a melting furnace, and compared with example 1, the present example is the same as example 1 except that the inclined trays in the drying section 5 are removed into 4 pieces and are again staggered so that the inclination angle of the inclined trays is 15 °.
Example 4
This example provides a melting furnace, and compared with example 1, the present example is the same as example 1 except that the inclined trays in the drying section 5 are removed into 2 pieces and are again staggered so that the inclination angle of the inclined trays is 20 °.
Example 5
This example provides a melting furnace, and compared with example 1, the present example removes the inclined trays in the deamination section 4 into 4 pieces and re-staggers the inclined trays so that the inclined angle is 10 °, and the rest is the same as example 1.
Example 6
This example provides a melting furnace, and compared to example 1, the present example removes 2 inclined trays in the deamination section 4 and re-interleaves the inclined trays to 20 ° apart, all as in example 1.
Example 7
Compared with the embodiment 1, the melting furnace provided by the embodiment has the advantages that one end of the second exhaust port 8 extending into the deamination section 4 is a beveled pipe, the beveled surface of the beveled pipe faces the melting section 3 and is provided with a filter screen, and the rest parts are the same as those in the embodiment 1.
The melting furnace provided by the embodiment 1-7 is applied to produce vanadium pentoxide, the raw material is ammonium polyvanadate with the water content of 20%, the combustion gas is propane gas, the combustion-supporting gas is oxygen, the temperature of the melting section is stably changed within 850 ℃ and 900 ℃ by adjusting the flow of the combustion gas and the combustion-supporting gas, and the volume fraction of the oxygen in the deamination section is maintained to be 20-30%. The temperature in the deamination section is stably changed within 450-480 ℃ and the temperature in the drying section is stably changed within 120-150 ℃ by adjusting the flow of the refrigerant in the grating plate.
The ammonium polyvanadate is produced into vanadium pentoxide by using the melting furnace provided in the embodiment 1-7, and the recovery rate of vanadium is over 99%, wherein when the ammonium polyvanadate is produced into vanadium pentoxide by using the melting furnace provided in the embodiment 7, the recovery rate of vanadium is as high as 99.5%.
To sum up, the melting furnace provided by the utility model has compact structure, the furnace top of the melting furnace is set as a single slope top, and the inclined tower plates are independently arranged in the drying section and the deamination section in a staggered way respectively, so that the material is uniformly and stably heated in the melting furnace, and the heating time of the material is ensured, thereby the drying, deamination and melting of the ammonium metavanadate material are independently carried out in the drying section, the deamination section and the melting section respectively; melting furnace is through arranging dry section, deamination section and melting section from the top down in proper order, and the heat that makes the combustion gas burning produce obtains utilizing layer upon layer, and energy utilization efficiency is high. When the melting furnace provided by the utility model is used for producing vanadium pentoxide, the recovery rate of vanadium is more than 99%.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. A melting furnace is characterized in that a grating plate is used for dividing the interior of the melting furnace into a drying section, a deamination section and a melting section from top to bottom;
the furnace top of the melting furnace is a single-slope top, the feeding hole is arranged on the higher side of the single-slope top, the first exhaust port is arranged at the lower end of the single-slope top, and the discharge hole is arranged at the bottom of the melting furnace;
inclined tower plates which are arranged in a staggered manner are respectively and independently arranged in the drying section and the deamination section, one end of each inclined tower plate is fixed on the furnace wall of the melting furnace, and the other end of each inclined tower plate is suspended to enable materials to pass through;
a second air outlet connected with an induced draft fan is arranged on one side of the deamination section, which is close to the drying section, and the induced draft flow is adjusted through a valve arranged on a connecting pipeline;
and a burner is arranged in the melting section.
2. The melting furnace according to claim 1, wherein 2-8 inclined trays are provided in said drying section, the inclined trays having an angle of inclination of 5-20 °.
3. The melting furnace of claim 1, wherein 2-6 inclined trays are provided in the deamination section, the inclined trays having an angle of 5-20 °.
4. The melting furnace according to claim 2 or 3, wherein said inclined plates are provided with through holes for the passage of gas.
5. The melting furnace according to claim 1, wherein the slope of said single-slope roof is 15-30 °.
6. The melting furnace according to claim 1, wherein a combustion gas line and a combustion-supporting gas line are provided in said burner, said combustion-supporting gas line being provided inside said combustion gas line.
7. The melting furnace according to claim 6, wherein said combustion gas line and said combustion-supporting gas line are provided with respective regulating valves independently.
8. The melting furnace of claim 1, wherein the grid plates are grid plates comprised of condenser tubes.
9. The melting furnace of claim 1, wherein one end of the second exhaust port is connected with an induced draft fan, the other end of the second exhaust port extends into the deamination section from the furnace wall of the melting furnace, one end of the deamination section extending into the deamination section is a bevel pipe, and the bevel face of the bevel pipe faces the melting section.
10. The melting furnace according to claim 9, wherein a filter is provided on a chamfered surface of the chamfered pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920784342.5U CN210089394U (en) | 2019-05-28 | 2019-05-28 | Melting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920784342.5U CN210089394U (en) | 2019-05-28 | 2019-05-28 | Melting furnace |
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| CN210089394U true CN210089394U (en) | 2020-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114538514A (en) * | 2022-02-16 | 2022-05-27 | 河钢承德钒钛新材料有限公司 | System for preparing vanadium pentoxide by three-step method |
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2019
- 2019-05-28 CN CN201920784342.5U patent/CN210089394U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114538514A (en) * | 2022-02-16 | 2022-05-27 | 河钢承德钒钛新材料有限公司 | System for preparing vanadium pentoxide by three-step method |
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