阅读说明：本技术 无氟低氮硫的钼铁冶炼原料、钼铁绿色冶炼系统及钼铁绿色冶炼方法 (Fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material, ferromolybdenum green smelting system and ferromolybdenum green smelting method ) 是由 徐业兴 郭钰龙 汪正峰 郝不景 胡俊岩 李红霞 戚静 刘振国 孙肖肖 于 2020-09-03 设计创作，主要内容包括：本发明涉及钼铁冶炼技术领域,尤其是涉及一种无氟低氮硫的钼铁冶炼原料、钼铁绿色冶炼系统及钼铁绿色冶炼方法。包括氧化钼4-5份,生石灰0.2-0.4份,铁磷1.2-2份,金属硅粉0.5-1.2份,铝粒0.2-0.4份,钢屑0.4-0.9和镁条0.05×10<Sup>-3</Sup>-0.25×10<Sup>-3</Sup>份。本发明通过无氟低氮硫的钼铁冶炼原料的设计以解决现有技术中存在的当前钼铁冶炼中,或多或少都会使用硝石做为补热剂,硝石反应后产生一定量的二氧化氮气体,再加上环保设备不到位,会导致一定量的二氧化氮排放到空气中,造成环境污染。同时,传统冶炼为改善渣的流动性,会使用萤石,萤石中的氟化钙同样也会对环境造成一定的污染的技术问题。(The invention relates to the technical field of ferromolybdenum smelting, in particular to a fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material, a ferromolybdenum green smelting system and a ferromolybdenum green smelting method, wherein the raw material comprises 4-5 parts of molybdenum oxide, 0.2-0.4 part of quick lime, 1.2-2 parts of iron phosphorus, 0.5-1.2 parts of metal silicon powder, 0.2-0.4 part of aluminum particles, 0.4-0.9 part of steel scraps and 0.05 × 10 part of magnesium strips ‑3 ‑0.25×10 ‑3 And (4) portions are obtained. The invention solves the problems that in the prior ferromolybdenum smelting, more or less saltpeter is used as a heat supplementing agent, a certain amount of nitrogen dioxide gas is generated after saltpeter reaction, and in addition, environmental protection equipment is not in place, a certain amount of nitrogen dioxide is discharged into the air to cause environmental pollution. Meanwhile, fluorite is used for improving the fluidity of slag in the traditional smelting process, and calcium fluoride in the fluorite also causes certain pollution to the environment。)

1. The fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material is characterized by comprising, by weight, 4-5 parts of molybdenum oxide, 0.2-0.4 part of quick lime, 1.2-2 parts of iron phosphorus, 0.5-1.2 parts of metal silicon powder, 0.2-0.4 part of aluminum particles, 0.4-0.9 part of steel scraps and 0.05 × 10 of magnesium strips^-3-0.25×10^-3And (4) portions are obtained.

2. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 1, characterized in that: in the molybdenum oxide, the content of the molybdenum oxide is 52-65%, and the content of sulfur is less than 0.085%.

3. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 2, characterized in that: the granularity of the molybdenum oxide is less than or equal to 15 mm; wherein, the molybdenum oxide with the grain size of 0.5mm accounts for 85.4 percent.

4. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 1, characterized in that: the silicon content in the silicon powder is more than or equal to 92 percent, the sulfur content is less than 0.02 percent, and the granularity of the silicon powder is less than or equal to 200 meshes.

5. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 1, characterized in that: the aluminum content in the aluminum particles is more than or equal to 97 percent, the sulfur content is less than 0.02, and the particle size of the aluminum particles is 0.3 mm-2.5 mm.

6. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 1, characterized in that: the iron content in the iron phosphorus is more than or equal to 76 percent, the sulfur content is less than 0.01, and the granularity of the iron phosphorus is required to be 5-20 mm; the iron content in the steel scrap is more than or equal to 98 percent, the sulfur content is less than 0.01, and the granularity of the steel scrap is 15-40 mm.

7. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 1, characterized in that: the CaO content in the quicklime is more than 90 percent, the sulfur content is less than 0.03, and the particle size of the quicklime is 200-325 meshes.

8. The ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur according to claim 1, characterized in that: the water content of the iron smelting raw material is less than or equal to 0.85 percent.

9. A ferromolybdenum green smelting system based on the fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material according to any one of claims 1 to 8, characterized in that:

the device comprises a plurality of raw material accurate weighing devices (1) which correspond to raw materials one by one, wherein each raw material accurate weighing device (1) is communicated with a repeated material bin (3) through a closed bucket type transmission belt (2), a discharge hole of the repeated material bin (3) is communicated with a feed hole of a first electromagnetic vibration feeder (4), a discharge hole of the first electromagnetic vibration feeder (4) is communicated with a feed hole of a mixer (5), a discharge hole of the mixer (5) is provided with a discharge pipe (6) extending downwards, a dust collection closed smoke hood (7) is closely sleeved on the discharge pipe (6), and the dust collection closed smoke hood (7) can move up and down along the discharge pipe (6) through an up-down moving mechanism (8); the device also comprises a smelting furnace (9) and a dust remover (10) arranged above the smelting furnace (9), wherein the smelting furnace (9) is fixed on an electronic double-drive track flat car (12) through a sand base disc (11); the outer diameter of the dust collection closed smoke hood (7) is larger than that of the smelting furnace (9);

wherein, accurate weighing device of raw materials (1) includes former feed bin (101), the discharge gate of former feed bin (101) and the feed inlet intercommunication of screw conveyer (102), the discharge gate of screw conveyer (102) and the feed inlet intercommunication of second electromagnetic vibration batcher (103), the discharge gate of second electromagnetic vibration batcher (103) and the feed inlet intercommunication of feed bin (104) of weighing, the discharge gate of feed bin (104) and the feed inlet intercommunication of sealed bucket type transmission belt (2), the discharge gate of sealed bucket type transmission belt (2) and the feed inlet intercommunication of multiple feed bin (3).

10. The ferromolybdenum green smelting method based on the ferromolybdenum green smelting system according to claim 9, characterized by comprising: the method comprises the following steps:

1) all the raw materials are respectively conveyed to a second electromagnetic vibration feeder (103) through a screw conveyor (102), all the raw materials are conveyed to a corresponding weighing bin (104) by each second electromagnetic vibration feeder (103), after all the weighing bins (104) accurately weigh the raw materials, the weighed raw materials are respectively conveyed to a re-weighing bin (3) through a closed bucket type conveying belt (2) according to the feeding sequence of iron scale, molybdenum oxide, aluminum particles, quick lime, steel scraps and metal silicon powder, after all the raw materials enter the re-weighing bin (3), the raw materials enter a mixer (5) through a first electromagnetic vibration feeder (4), and the materials are mixed for 10-20 minutes to obtain a mixture;

2) fixing a smelting furnace (9) on an electronic dual-drive track flat car (12) through a sand base disc (11), moving the electronic dual-drive track flat car (12) to be under a discharge pipe (6) of a mixer (5), covering a dust collection closed smoke hood (7) on the smelting furnace (9) through an up-down moving mechanism (8), discharging a mixture into the smelting furnace (9), moving the dust collection closed smoke hood (7) up through the up-down moving mechanism (8) after discharging is finished, and moving the smelting furnace (9) to be under a dust remover (10) through the electronic dual-drive track flat car (12);

3) starting the dust remover (10), then starting the smelting furnace (9) to smelt the mixture to obtain a ferromolybdenum smelting product;

feeding is carried out when the mixer (5) rotates forwards, discharging is carried out when the mixer (5) rotates backwards, the forward rotation frequency of the mixer (5) is greater than the reverse rotation frequency of the mixer (5), and the reverse rotation frequency of the mixer (5) is greater than the vibration frequency of the first electromagnetic vibration feeder (4); in the smelted ferromolybdenum smelting product, the molybdenum recovery rate is more than or equal to 99.5 percent; the dust concentration of the gas discharged into the atmosphere is 4-10mg/Nm³(ii) a The working frequency of the fan of the dust remover is more than or equal to 30 HZ.

Technical Field

The invention relates to the technical field of ferromolybdenum smelting, in particular to a fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material, a ferromolybdenum green smelting system and a ferromolybdenum green smelting method.

Background

At present ferromolybdenum is smelted, more or less the saltpeter that will use as the heat-supplementing agent produces a certain amount of nitrogen dioxide gas after the saltpeter reaction, and environmental protection equipment is not in place in addition, can lead to a certain amount of nitrogen dioxide to discharge in the air, causes environmental pollution. Meanwhile, fluorite is used for improving the fluidity of slag in the traditional smelting process, and calcium fluoride in the fluorite also causes certain pollution to the environment.

In addition, materials required by ferromolybdenum smelting are fine in granularity and dry, certain dust can be generated in the processes of proportioning, transferring and mixing, and unreasonable dust collection exists in the traditional process equipment or process, so that a certain amount of dust is emitted to a workshop in the material conveying process, and the environment pollution of the workshop is caused. Meanwhile, ferromolybdenum smelting belongs to exothermic reaction, a large amount of high-temperature flue gas is generated in the reaction process, a smelting furnace is fixed in the traditional smelting mode, the generated flue gas is collected by moving a chimney cover, and the mode has serious flue gas leakage and incomplete collection, and has no cooling system design, so that a large amount of flue gas is discharged into the atmosphere along with dust.

Therefore, in order to solve the above problems, the present invention urgently needs to provide a fluorine-free low-nitrogen sulfur ferromolybdenum smelting raw material, a ferromolybdenum green smelting system and a ferromolybdenum green smelting method.

Disclosure of Invention

The invention aims to provide a ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur, a ferromolybdenum green smelting system and a ferromolybdenum green smelting method. Meanwhile, fluorite is used for improving the fluidity of slag in the traditional smelting process, and calcium fluoride in the fluorite also causes certain pollution to the environment.

The invention provides a fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material which comprises, by weight, 4-5 parts of molybdenum oxide, 0.2-0.4 part of quicklime, 1.2-2 parts of iron phosphorus, 0.5-1.2 parts of metal silicon powder, 0.2-0.4 part of aluminum particles, 0.4-0.9 part of steel scraps and 0.05 × 10 parts of magnesium strips^-3-0.25×10^-3And (4) portions are obtained.

Preferably, the molybdenum oxide has a molybdenum oxide content of 52-65% and a sulfur content of < 0.085%.

Preferably, the particle size of the molybdenum oxide is less than or equal to 15 mm; wherein, the molybdenum oxide with the grain size of 0.5mm accounts for 85.4 percent.

Preferably, the silicon content in the silicon powder is more than or equal to 92 percent, the sulfur content is less than 0.02 percent, and the particle size of the silicon powder is less than or equal to 200 meshes.

Preferably, the aluminum content in the aluminum particles is more than or equal to 97 percent, the sulfur content is less than 0.02, and the particle size of the aluminum particles is 0.3 mm-2.5 mm.

Preferably, the iron content in the iron phosphorus is more than or equal to 76 percent, the sulfur content is less than 0.01, and the granularity of the iron phosphorus is required to be 5-20 mm; the iron content in the steel scrap is more than or equal to 98 percent, the sulfur content is less than 0.01, and the granularity of the steel scrap is 15-40 mm.

Preferably, the CaO content in the quicklime is more than 90 percent, the sulfur content is less than 0.03, and the particle size of the quicklime is 200-325 meshes.

Preferably, the water content of the iron smelting raw material is less than or equal to 0.85%.

The invention also provides a ferromolybdenum green smelting system based on the fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material, which is characterized in that:

the device comprises a plurality of raw material accurate weighing devices which correspond to raw materials one by one, wherein each raw material accurate weighing device is communicated with a repeated material bin through a closed bucket type transmission belt, a discharge hole of the repeated material bin is communicated with a feed hole of a first electromagnetic vibration feeder, a discharge hole of the first electromagnetic vibration feeder is communicated with a feed hole of a mixer, a discharge hole of the mixer is provided with a discharge pipe extending downwards, a dust collection closed smoke hood is closely sleeved on the discharge pipe, and the dust collection closed smoke hood can move up and down along the discharge pipe through an up-and-down moving mechanism; the smelting furnace is fixed on the electronic dual-drive track flat car through a sand base disc; the outer diameter of the dust collection closed smoke hood is larger than that of the smelting furnace;

wherein, the accurate weighing device of raw materials includes former feed bin, and the discharge gate and screw conveyer's of former feed bin feed inlet intercommunication, screw conveyer's discharge gate and second electromagnetic vibration batcher's feed inlet intercommunication, second electromagnetic vibration batcher's discharge gate and the feed inlet intercommunication of feed bin of weighing, the discharge gate and the feed inlet intercommunication of sealing bucket type transmission belt of feed bin of weighing, the discharge gate and the feed inlet intercommunication of compound feed bin of sealing bucket type transmission belt.

The invention also provides a ferromolybdenum green smelting method based on the ferromolybdenum green smelting system, which comprises the following steps of:

1) conveying the raw materials to second electromagnetic vibration feeders through screw conveyors respectively, conveying the raw materials to corresponding weighing bins by the second electromagnetic vibration feeders, conveying the weighed raw materials to a repeating bin through a closed bucket type conveying belt respectively according to the feeding sequence of iron scale, molybdenum oxide, aluminum particles, quicklime, steel scraps and metal silicon powder after the raw materials are accurately weighed by the weighing bins, conveying the raw materials into the repeating bin through a first electromagnetic vibration feeder after all the raw materials enter the repeating bin, and mixing for 10-20 minutes to obtain a mixture;

2) fixing a smelting furnace on an electronic dual-drive track flat car through a sand base plate, moving the electronic dual-drive track flat car to be under a discharge pipe of a mixer, covering a dust collection closed smoke hood on the smelting furnace through an up-down moving mechanism, discharging a mixture into the smelting furnace, after discharging is finished, moving the dust collection closed smoke hood upwards through the up-down moving mechanism, and moving the smelting furnace to be under a dust remover through the electronic dual-drive track flat car;

3) starting the dust remover, then starting the smelting furnace, and smelting the mixture to obtain a ferromolybdenum smelting product;

feeding is carried out when the mixer rotates forwards, discharging is carried out when the mixer rotates backwards, the forward rotation frequency of the mixer is greater than the reverse rotation frequency of the mixer, and the reverse rotation frequency of the mixer is greater than the vibration frequency of the first electromagnetic vibration feeder; in the smelted ferromolybdenum smelting product, the molybdenum recovery rate is more than or equal to 99.5 percent; the dust concentration of the gas discharged into the atmosphere is 4-10mg/Nm³(ii) a The working frequency of the fan of the dust remover is more than or equal to 30 HZ.

Compared with the prior art, the fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material, the ferromolybdenum green smelting system and the ferromolybdenum green smelting method provided by the invention have the following progress:

1. the invention provides a ferromolybdenum smelting raw material without fluorine and low nitrogen and sulfur, the ferromolybdenum smelting adopts a fluorine-free ultralow nitrogen and sulfur formula design, the requirements of the current environmental protection policy can be completely met, the ferromolybdenum smelting method conforms to the modern green factory development concept, and meanwhile, the molybdenum recovery rate reaches more than 99%.

2. The ferromolybdenum smelting adopts a fluorine-free ultralow nitrogen and sulfur formula design, and the dust concentration in a workshop operation area is lower than 4mg/Nm³The flue gas is free of fluorine and has ultralow nitrogen and sulfur emission, the requirements of the current environmental protection policy can be completely met, the development concept of local and green factories is met, the working environment of workers can be greatly improved, and the labor intensity can be greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of the ferromolybdenum green smelting system disclosed by the invention;

FIG. 2 shows a ferromolybdenum green smelting method disclosed by the invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

The invention provides a fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw material which comprises, by weight, 4-5 parts of molybdenum oxide, 0.2-0.4 part of quicklime, 1.2-2 parts of iron phosphorus, 0.5-1.2 parts of metal silicon powder, 0.2-0.4 part of aluminum particles, 0.4-0.9 part of steel scraps and 0.05 × 10 parts of magnesium strips^-3-0.25×10^-3And (4) portions are obtained.

Specifically, the molybdenum oxide contains 52-65% of molybdenum oxide and less than 0.085% of sulfur.

Specifically, the granularity of the molybdenum oxide is less than or equal to 15 mm; wherein, the molybdenum oxide with the grain size of 0.5mm accounts for 85.4 percent.

Specifically, the silicon content in the silicon powder is more than or equal to 92 percent, the sulfur content is less than 0.02 percent, and the particle size of the silicon powder is less than or equal to 200 meshes.

Specifically, the aluminum content in the aluminum particles is more than or equal to 97 percent, the sulfur content is less than 0.02, and the particle size of the aluminum particles is 0.3 mm-2.5 mm.

Specifically, the iron content in the iron phosphorus is more than or equal to 76 percent, the sulfur content is less than 0.01, and the granularity of the iron phosphorus is required to be 5-20 mm; the iron content in the steel scrap is more than or equal to 98 percent, the sulfur content is less than 0.01, and the granularity of the steel scrap is 15-40 mm.

Specifically, the CaO content in the quicklime is more than 90 percent, the sulfur content is less than 0.03, and the particle size of the quicklime is 200-325 meshes.

Specifically, the water content of the iron smelting raw material is less than or equal to 0.85 percent.

As shown in fig. 1, the invention also provides a ferromolybdenum green smelting system based on the fluorine-free low-nitrogen-sulfur ferromolybdenum smelting raw materials, which comprises a plurality of raw material accurate weighing devices 1 corresponding to the raw materials one by one, wherein each raw material accurate weighing device 1 is communicated with a repeated material bin 3 through a closed bucket type transmission belt 2, a discharge hole of the repeated material bin 3 is communicated with a feed hole of a first electromagnetic vibration feeder 4, a discharge hole of the first electromagnetic vibration feeder 4 is communicated with a feed hole of a mixer 5, a discharge hole of the mixer 5 is provided with a discharge pipe 6 extending downwards, a dust collection closed smoke hood 7 is closely sleeved on the discharge pipe 6, and the dust collection closed smoke hood 7 can move up and down along the discharge pipe 6 through an up-down moving mechanism 8; the smelting furnace 9 is fixed on an electronic dual-drive track flat car 12 through a sand base plate 11; the outer diameter of the dust collection closed smoke hood 7 is larger than that of the smelting furnace 9; wherein, accurate weighing device 1 of raw materials includes former feed bin 101, and the discharge gate of former feed bin 101 and screw conveyer 102's feed inlet intercommunication, screw conveyer 102's discharge gate and second electromagnetic vibration feeder 103's feed inlet intercommunication, and second electromagnetic vibration feeder 103's discharge gate and weighing bin 104's feed inlet intercommunication, weighing bin 104's discharge gate and the feed inlet intercommunication of sealing bucket type transmission belt 2, and sealing bucket type transmission belt 2's discharge gate and the feed inlet intercommunication of compound feed bin 3.

As shown in fig. 2, the invention also provides a ferromolybdenum green smelting method based on the ferromolybdenum green smelting system, which comprises the following steps:

s1) conveying the raw materials to second electromagnetic vibration feeders 103 through screw conveyors 102 respectively, conveying the raw materials to corresponding weighing bins 104 through the second electromagnetic vibration feeders 103, conveying the weighed raw materials to a repeated material bin 3 through a closed bucket type conveying belt 2 respectively according to the feeding sequence of iron scale, molybdenum oxide, aluminum particles, quicklime, steel scraps and metal silicon powder after the raw materials are accurately weighed by the weighing bins 104, conveying the raw materials into a mixer 5 through a first electromagnetic vibration feeder 4 after all the raw materials enter the repeated material bin 3, and mixing for 10-20 minutes to obtain a mixture;

s2) fixing the smelting furnace 9 on the electronic dual-drive track flat car 12 through the sand base plate 11, moving the electronic dual-drive track flat car 12 to be under a discharge pipe 6 of the mixer 5, covering the dust collection closed smoke hood 7 on the smelting furnace 9 through the up-down moving mechanism 8, discharging the mixture into the smelting furnace 9, moving the dust collection closed smoke hood 7 upwards through the up-down moving mechanism 8 after discharging is finished, and moving the smelting furnace 9 to be under a dust remover 10 through the electronic dual-drive track flat car 12;

s3) starting the dust remover 10, then starting the smelting furnace 9, and smelting the mixture to obtain a ferromolybdenum smelting product;

feeding is carried out when the mixer 5 rotates forwards, discharging is carried out when the mixer 5 rotates backwards, the forward rotation frequency of the mixer 5 is greater than the reverse rotation frequency of the mixer 5, and the reverse rotation frequency of the mixer 5 is greater than the vibration frequency of the first electromagnetic vibration feeder 4; in the smelted ferromolybdenum smelting product, the molybdenum recovery rate is more than or equal to 99.5 percent; the dust concentration of the gas discharged into the atmosphere is 4-10mg/Nm³(ii) a The working frequency of the fan of the dust remover is more than or equal to 30 HZ.