WO2017185858A1

WO2017185858A1 - Serial flash furnace and smelting method thereof

Info

Publication number: WO2017185858A1
Application number: PCT/CN2017/074026
Authority: WO
Inventors: 李效东; 邱江波; 夏明�; 黄小兵
Original assignee: 天津闪速炼铁技术有限公司
Priority date: 2016-04-28
Filing date: 2017-02-19
Publication date: 2017-11-02
Also published as: CN105925809B; CN105925809A

Abstract

A serial flash furnace, comprising an upper reaction body (5) and a lower reaction body (1), and a connecting channel (7) connecting the upper reaction body (5) and the lower reaction body (1). The upper reaction body (5) is located above the lower reaction body (1) to form a serial structure. At least one melting pool (2) is provided at a lower portion of the lower reaction body (1). The flash furnace further comprises a rising flue (3) for discharging flue gases. The rising flue (3) is in communication with the lower reaction body (1) by means of the melting pool (2). Each melting pool (2) is provided with a slag discharge port.

Description

Tandem flash furnace and smelting method

Technical field

The invention belongs to the field of metallurgy, and in particular relates to a tandem flash furnace and a smelting method.

Background technique

Flash metallurgy has been used only for the smelting of metal sulfide ore from the invention to the present. The main reason is that the existing flash furnace only has one reaction space and is a micro-negative pressure environment in which gas-solid or gas-liquid can be carried out. An oxidation reaction or a weak reduction reaction, but a strong reducing atmosphere cannot be produced to carry out a rapid and effective reduction reaction. For example, a single reaction space using a micro-negative pressure of a flash furnace cannot produce an effective reducing gas (CO + H ₂ ) volume ratio exceeding 73% of the reducing gas, so there is no guarantee that the metal oxide will substantially complete the reduction in the suspended state.

Summary of the invention

In view of this, the present invention aims to provide a tandem flash furnace to solve the problems of low efficiency of direct production of reducing gas in the existing flash furnace space, low concentration of active components, and high cost and high risk of introducing reducing gas from the outside.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A tandem flash furnace comprising an upper reaction body 5, a lower reaction body 1 and a connecting passage 7 communicating the two, the upper reaction body 5 being located at an upper portion of the lower reaction body 1, forming a tandem structure, the lower At least one molten pool 2 is disposed at a lower portion of the reaction body 1; the flash furnace further includes a rising flue 3 for discharging flue gas, and the rising flue 3 is connected to the lower reaction body 1 through the molten pool 2 Each of the molten pools 2 is provided with a slag discharge port. By spraying the oxygen-containing gas (air, oxygen-air mixture or process oxygen) and gasifying agent such as coal powder, coal water slurry, water vapor, natural gas, fuel oil and methane into the upper reaction body 5, the reaction body under the flash furnace 1 A reducing gas (CO + H ₂ ) is produced while supplying heat to the lower reactant 1. The gas pressure in the upper reaction body 5 may be greater than or equal to the pressure of the lower reaction body 1, preferably a high pressure condition, by constructing an independent high temperature and high pressure gasification space, so that the gasifying agent can be well vaporized, thereby improving the effective reducing gas ( Concentration of CO + H ₂ ). The pressure of the upper reaction body 5 can be controlled by adjusting the inner width of the connecting passage 7 and the amount of the oxygen-containing gas and the gasifying agent to be injected per unit time. The tandem flash furnace of the invention has the advantages of compact structure, and can directly supply the heat and reducing atmosphere required for smelting to the reaction body 1 through the upper reaction body 5, and is returned to the smelting after being compared with some existing ones. The gas smelting process avoids the heat loss of the high-temperature gas during the long-distance transportation process and the loss of the transmission pipeline (the high-temperature exhaust gas above 1000 °C has higher requirements on the pipeline material, the pipeline cost is high, and the service life is short); At the same time, since no auxiliary equipment (such as tail gas cracking conversion equipment, gas pressure conveying equipment, etc.) is required, the one-time investment is greatly reduced, and the failure rate of the whole equipment is greatly reduced, thereby reducing equipment cost and maintenance cost; The upper reaction body 5 of the present invention has a simple gas-making principle, and can be realized by a simple chemical reaction using a gasifying agent (such as coal powder) and oxygen, without using other complicated and expensive methods (such as plasma ionization, etc.). Gasification or gas conversion greatly reduces production and use costs. The upper reaction body 5 is located at the upper part of the lower reaction body 1, and is directly connected in series by a connecting passage 7 of not more than 2 m, so that the reducing gas stream produced by the upper reaction body 5 can enter from the top of the lower reaction body 1, thereby making the connection The mineral powder added to the channel 7 and the reducing atmosphere have a longer contact time and increase the reduction rate of the metal oxide to be smelted.

Further, the inner width of the connecting passage 7 is not more than 2/3 of the inner diameter of the lower reaction body 1, and the length is not more than 2 m. The inner width of the connecting passage 7 is adjustable, and by controlling the inner width of the connecting passage 7, the pressure inside the upper reaction body 5 can be controlled, thereby affecting the gas generating efficiency, and at the same time, the upper reaction body 5 can be changed to the inner reaction body 1 to be transported. The speed of the airflow. The length of the connecting channel 7 is not more than 2 m, so as not to affect the efficiency of the upper reaction body 5 transferring heat to the reaction body 1 downward.

Further, the connecting channel 7 is provided with a feeding device. The ore powder to be smelted is added to the flash furnace through a feeding device disposed on the connecting passage 7, so that the ore powder and the reducing gas can be contacted and fully mixed before entering the lower reaction body 1, and the disintegration extends the ore to be smelted. The smelting time of the powder in the lower reaction body 1 increases the reduction rate of the metal oxide to be smelted in the mineral powder. The feeding device is one or more of a nozzle, a spray gun, and a sealing feed port; or a combination of one or more of a nozzle, a spray gun, and a sealing feed port and a burner. The raw materials, fuel and auxiliary materials necessary for smelting are added to the flash furnace by setting a nozzle or a spray gun or a sealed feed port; if necessary, heat can be added to the lower reaction body 1 through the burner. Of course, the feeding device can also be disposed on the top of the lower reaction body 1 or on the side wall of the lower reaction body 1 according to actual needs.

Further, the upper reaction body 5 is provided with a spray gun or a nozzle for spraying an oxygen-containing gas and a gasifying agent into the upper reaction body 5. A spray gun or a nozzle is disposed on the upper reaction body 5, penetrates the inner wall of the upper reaction body 5, and projects into the upper reaction body 5. The spray gun or nozzle can be single or multi-channel, which can spray only one raw material, and the multi-channel spray gun or nozzle can simultaneously spray a variety of raw materials. The spray gun or the nozzle sprays an oxygen-containing gas and a gasifying agent into the upper reaction body 5, such as a combination of one or more of coal powder, coal water slurry, water vapor, natural gas, fuel oil, methane and acetylene, to be used for producing a reduction. The gas supplies heat to the lower reactant 1. Preferably, the gasification agent is pulverized coal, and the coal gasification technology is relatively mature, and at the same time, coal is also the most economical gas-making raw material in China at present.

Further, an upper portion of the space in which the melt is contained in the molten pool 2 is provided with a space of a pyrophoric layer through which the molten charge falls. The upper portion of the molten pool 2 is formed with a pyrophoric layer 6 that passes through the molten charge. One implementation is to add coke to the lower reaction body 1 through a charging device disposed at the top of the connecting passage 7 or the lower reaction body 1, coke. The particle size ranges from 1 to 11 mm, and is rapidly heated in the lower reaction body 1. The heated coke particles fall on the surface of the molten pool 2 to form a porous carbon material-coke filter layer 6; if the coke has a particle size of less than 1 mm, Coke is depleted faster at high temperatures, but the particle size exceeds 11mm. The center of the coke cannot be heated to a sufficient temperature, and the excessive particle size causes the gap between the coke particles to become large, which causes a loss of the metal oxide melt recovery rate through the pyrophoric layer 6. The coke filter layer 6 can also be realized by adding a pulverized coal suitable for coking, and after the pulverized coal is burned off at a high temperature, coke particles can be formed.

Further, the focal filter layer 6 has a space of 50-250 mm. The space of the pyrophoric layer is 50-250 mm, preferably 100-200 mm. If the coke filter layer 6 is too thick, it will cause coke waste, increase energy consumption, and too thin to achieve the required reduction effect. Depending on the ease with which the metal oxide to be smelted is reduced by carbon, the thickness of the pyrophoric layer can be appropriately adjusted by adjusting the rate at which coke or pulverized coal suitable for coking is added to the lower reactant 1.

Further, each of the molten pools 2 is provided with a side blowing arrangement for injecting fuel and oxygen-containing gas into the molten pool 2. Fuel and gas are injected into the molten pool by side blowing to provide heat to the molten pool to maintain the molten pool at a certain high temperature. The fuel is one of heavy oil, natural gas, liquefied petroleum gas, coal, coke, and hydrocarbon; the oxygen-containing gas is air, an oxygen-air mixture, or process oxygen.

Further, the position of the side blowing arrangement corresponds to a lower middle portion of the slag layer in the molten pool. The side blowing is arranged in the lower part of the slag layer, so that the slag can be convected or tumbling, which facilitates the exchange of heat and substance between the upper and lower layers, thereby reducing the viscosity of the melt and improving the recovery rate of the metal to be smelted.

Further, the side blowing arrangement includes side blowing holes symmetrically disposed on opposite side walls of the molten pool 2 and side blowing nozzles 4 disposed in the side blowing holes.

Further, the number of the molten pools 2 is 1-4. The setting of 1-4 molten pools 2 in the flash furnace can meet the needs of different smelting production.

The present invention also provides a method of smelting using the above-described tandem flash furnace.

The invention also protects the use of the flash furnace described above in smelting.

Compared with the prior art, the tandem flash furnace of the present invention has the following advantages:

The tandem flash furnace of the present invention is capable of producing a high-temperature, high-pressure, high-concentration reducing gas in the upper reaction body 5, and providing the lower reactant 1 with a reducing atmosphere and heat required for smelting, as opposed to being directly under the existing flash furnace. Coal gasification in the reaction body 1 has higher quality of gasification on the one hand, and can provide a higher concentration of effective reducing gas for the smelting process, thereby making the reduction speed of the mineral powder in the lower reaction body 1 faster, and also making some The space needs a high concentration reducing atmosphere to realize the reduction of the metal oxide by flash furnace smelting; on the other hand, the gas-making efficiency is higher, and it is not necessary for the lower reaction body 1 to undertake the task of gas-making again. Entering the flash furnace, it can fully contact with the reducing gas and react, and the phase change extends the mine. The smelting time of the powder in the flash furnace space increases the reduction rate of the metal to be smelted, reduces energy consumption, and improves economic efficiency.

The tandem flash furnace of the present invention connects the reaction body and the lower reaction body in series through a connecting channel of not more than 2 m, so that the reducing atmosphere and heat generated by the upper reaction body can be efficiently and quickly supplied to the lower reaction body, compared with the existing one. Some processes in the metallurgical industry that return the tail gas and then return it as a smelting gas, the process is simple, the one-time investment is small, the energy consumption is low, and the production and maintenance costs are low.

DRAWINGS

The accompanying drawings, which are incorporated in the claims In the drawing:

1 is a schematic structural view of a tandem flash furnace according to an embodiment of the present invention;

2 is a schematic view showing a second structure of a tandem flash furnace according to an embodiment of the present invention;

3 is a schematic view showing a third structure of a tandem flash furnace according to an embodiment of the present invention;

4 is a fourth structural schematic view of a tandem flash furnace according to an embodiment of the present invention;

5 is a fifth structural schematic view of a tandem flash furnace according to an embodiment of the present invention;

6 is a sixth structural schematic view of a tandem flash furnace according to an embodiment of the present invention;

7 is a seventh structural schematic view of a tandem flash furnace according to an embodiment of the present invention;

8 is a schematic structural view of an eighth type of a tandem flash furnace according to an embodiment of the present invention;

9 is a schematic view showing a ninth structure of a tandem flash furnace according to an embodiment of the present invention;

10 is a schematic structural view of a tenth type of a tandem flash furnace according to an embodiment of the present invention;

FIG. 11 is a schematic view showing a tenth structure of a tandem flash furnace according to an embodiment of the present invention.

Description of the reference signs:

1- lower reaction body, 2-melt pool, 3-rise flue, 4-side blow nozzle, 5-upper reaction body, 6-pyro filter layer, 7-connected channel.

detailed description

It should be noted that the embodiments in the present invention and the features in the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications of "upright", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and The simplification of the description is not intended to limit or imply that the device or component that is referred to has a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting. Moreover, the terms "first", "second", and the like are used for the purpose of description only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first", "second", etc. may include one or more of the features, either explicitly or implicitly.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components. The specific meaning of the above terms in the present invention can be understood by a person of ordinary skill in the art.

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

A tandem flash furnace, as shown in FIGS. 1-11, includes an upper reaction body 5, a lower reaction body 1 and a connecting passage 7 communicating the two, and the upper reaction body 5 is located at an upper portion of the lower reaction body 1 to form a tandem structure. The lower part of the lower reaction body 1 is provided with at least one molten pool 2; the flash furnace further comprises a rising flue 3 for discharging flue gas, and the rising flue 3 is connected to the lower reaction body 1 through the molten pool 2, each molten pool 2 There are slag discharge ports on the top, and the slag discharge ports are not marked in Figure 1-11.

The working process of the present example: the gas-generating fuel and the oxygen-containing gas are sprayed into the upper reaction body 5 to generate a high concentration of reducing gas and release heat, and the dry metal oxide ore powder, the flux and the molten material are sprayed into the reaction body 1 downward. Coke, in the lower reaction body 1 with high temperature and high temperature and full of reducing atmosphere, through the heat transfer, mass transfer and gas-solid, gas-liquid reaction, the reduction and melting of the metal oxide to be smelted in the powder are rapidly completed; The dispersed oxide melt formed in the droplet falls into the molten pool and enters the pyrophoric layer 6. When the melt penetrates the pyrophoric layer 6, the metal oxide to be smelted which is not completely reduced is reduced by carbothermal .

In the molten pool 2, the gangue and the flux in the ore powder undergo a slagging reaction to form a slag having a low melting point. If necessary, a side blowing arrangement may be provided in the molten pool 2, and the fuel and the oxygen-containing gas are respectively injected into the melt by the side blowing. In this embodiment, the coal powder and the oxygen are respectively injected into the melt to be melted. The pool 2 provides heat and achieves the tumbling of the melt, while maintaining the molten pool 2 in a strong reducing environment, and the remaining metal oxide to be smelted is completely reduced in the molten pool 2, thereby improving the recovery rate of the metal to be smelted. The reduced low-boiling metal into the flue gas exits the furnace through the ascending flue 3, and can be collected by condensation or fuming, and the remaining molten metal is precipitated and layered in the molten pool 2 to form a layer. Metal layer and slag layer, metal The melt is discharged from the molten pool 2 to obtain a crude metal, and the molten slag is discharged from the slag discharge port.

The tandem flash furnace provided by the invention is applied to the smelting of soot in a steel plant:

Iron and steel enterprises produce a large amount of soot in the blast furnace, electric furnace, converter, sintering and other sections. The soot contains oxides of valuable metals such as zinc, lead, antimony, indium and iron, of which the content of indium and antimony is relatively low. The following is a table of the main metal components obtained from the weighted average of zinc-containing soot components in a domestic steel plant, as shown in Table 1:

Table 1:

FeFe	PbPb	ZnZn	BiBi	InIn
30.2％30.2%	3.5％3.5%	7.5％7.5%	0.3％0.3%	0.010％0.010%

The outer wall of the upper reaction body 5 and the connecting passage 7 is double-layer steel plate, the cooling water is passed in the middle, and the refractory brick is built on the inner wall. The cooling water forms a chilled wall, which is favorable for the ash in the coal to form a slag on the inner wall to protect the furnace wall. The upper reaction body 5 is provided with four spray guns on the side wall, and pulverized coal and oxygen gas (which can be added with water vapor) are sprayed from the spray gun 2 into the upper reaction body 5, and the pulverized coal in the upper reaction body 5 is rapidly burned and vaporized to form a temperature of A reducing gas stream having a volume ratio of effective reducing gas (CO + H ₂ ) of 90% at 1380 ° C is ejected from the outlet of the upper reactant 5 .

The connecting passage 7 has a length of 0.8 m and an inner width of about 2/5 of the inner diameter of the lower reaction body 1. The feeding passage 7 is provided with a feeding device. In this embodiment, the feeding device is a sealed feeding port having a three-layer channel structure. Through the sealed feeding port of the three-layer channel structure, the compressed air is used to send the steel plant soot, flux and coke into the flash furnace. The general dust particle size of the steel plant is below 100 mesh, no need to carry out grinding treatment. Drying to a water content of %0.3%; flux is limestone, containing more than 90% CaCO ₃ , particle size less than 1mm, drying to less than 1% water; coke particle size in the range of 1-11mm.

The soot particles are thoroughly mixed with the reducing gas ejected from the upper reaction body 5 at the moment of being sprayed into the flash furnace, and are floated into the lower reaction body 1 at a high temperature of about 1100 ° C to 1450 ° C, and the metal oxide in the soot. It is mass-extended in a very high specific surface area in the lower reaction body 1 filled with reducing gas, and rapidly completes zinc, lead, iron and antimony in the powder by rapid heat transfer, mass transfer and gas-solid and gas-liquid reaction. The metal oxide such as indium is reduced and melted, and falls in the molten pool in the lower portion of the lower reaction body 1. The reduced Zn is rapidly vaporized and enters the ascending flue 3, and can be recovered by means of lead rain/zinc rain condensation or fuming.

The metal oxide melt such as iron and zinc which is not completely reduced in the lower reactant 1 enters the 150 mm thick coke filter layer 6 in the form of droplets, and is reduced by carbon when the melt penetrates the pyrophoric layer 6 downward. Therefore, the metal oxides such as ZnO and FeO which are relatively difficult to reduce are also substantially reduced.

In the molten pool 2, the gangue in the ore powder and the added flux slag are sprayed with oxygen and pulverized coal into the molten pool 2 through the side blowing nozzle 4 (process oxygen concentration is 99.6%, and pulverized coal particle size is 5 mm-8 mm) The molten pool 2 is supplemented with heat, and the molten pool 2 is formed into a high-temperature reducing environment of 1300 ° C to 1650 ° C. The position of the side blowing is located at the lower part of the slag layer, and the melt can be tumbling, so that a small amount of unreduced zinc oxide, lead bismuth, indium and the like in the slag layer is sufficiently contacted with the carbon reducing agent to completely complete the reduction. In the molten pool 2, Most of the reduced Zn will rapidly vaporize away from the melt into the ascending flue 3, and the remaining metal droplets will be concentrated down through the less dense slag layer, and the Fe and Pb will melt. The body is completely immiscible, and the metal layer is divided into a molten iron layer and a crude lead alloy layer. Due to the difference in density, the molten pool 1 forms a three-layer structure of a slag layer, a molten iron layer and a crude lead alloy layer from top to bottom. A small amount of Bi, In and a small amount of unvaporized Zn are easily dissolved in the lead liquid, and are trapped by the lead liquid and then enter the crude lead alloy layer. After the crude lead alloy is discharged, the Pb can be purified by refining or the like. metal.

The process for treating steel soot by using the tandem flash furnace provided by the invention is shorter than the existing rotary kiln process or wet process, and can comprehensively recover a plurality of valuable metals, and the comprehensive energy consumption is reduced by more than 40%. Pollution is reduced by 90%.

The main chemical reactions occurring in the lower reactant 1 are:

CaCO ₃ =CaO+CO ₂

ZnO+CO=Zn(g)+CO ₂

PbO+CO=Pb+CO ₂

Bi ₂ O ₃ +3CO=2Bi+3CO ₂

In ₂ O ₃ +3CO=2In+3CO ₂

3Fe ₂ O ₃ +CO=2Fe ₃ O ₄ +CO ₂

Fe ₃ O ₄ +CO=3FeO+CO ₂

FeO+CO=Fe+CO ₂

The main chemical reactions occurring in the molten pool 2 are as follows:

(PbO) _slag + C = Pb (l) + CO

(ZnO) _slag + C = Zn (g) + CO

(ZnO) _slag + Fe(l) = Zn(g) + (FeO) _slag

(PbO) _slag + Fe(l) = Pb(g) + (FeO) _slag

(FeO) _slag + C = Fe(l) + CO

(Bi ₂ O ₃ ) _slag +3C=2Bi(l)+3CO

(In ₂ O ₃ ) _slag +3C=2In(l)+3CO

According to an embodiment of the invention, the inner width of the connecting passage 7 is not more than 2/3 of the inner diameter of the lower reaction body 1, while the length is not more than 2 m. The inner width of the connecting passage 7 affects the pressure inside the upper reaction body 5, thereby affecting the gas generating efficiency. The length of the connecting passage 7 is not more than 2 m, so as not to affect the efficiency of the upper reaction body 5 transferring heat to the reaction body 1 downward.

According to an embodiment of the present invention, the connecting channel 7 is provided with a feeding device, as shown in FIG. 1, through which the ore powder to be smelted can be fed, the mineral powder and the reducing gas are contacted in advance, and the mineral powder is increased. The reduction rate of metal oxides to be smelted. The feeding device is one or more of a nozzle, a spray gun, and a sealing feed port; or a combination of one or more of a nozzle, a spray gun, and a sealing feed port and a burner. Add the raw materials, fuel and auxiliary materials necessary for smelting to the flash furnace by setting a nozzle or a spray gun or a sealed feed port. The feeding device may also be disposed at the top end of the lower reaction body 1, as shown in Fig. 2, and two sets of burners are disposed at the top of the lower reaction body 1 to supplement the heat of the lower reaction body 1. Further, the feeding means may be provided on the side wall of the lower reaction body 1 as needed.

According to an embodiment of the present invention, the upper reaction body 5 is provided with a spray gun or a nozzle for blowing an oxygen-containing gas and a gasifying agent into the upper reaction body 5. The spray gun or nozzle is disposed on the upper reaction body 5, penetrates the inner wall of the upper reaction body 5, and extends into the upper reaction body 5, as shown in FIGS. 1 and 2. The lance or the nozzle sprays an oxygen-containing gas and a gasifying agent into the reaction body 5. The dual-channel spray gun injects oxygen and pulverized coal into the reaction body 5 to generate a reducing gas (CO + H ₂ ) and provide heat to the lower reaction body 1.

According to an embodiment of the invention, a space above the space in which the melt is contained in the molten pool 2 is provided with a space for the filter layer. The upper portion of the melt of the molten pool 2 is formed with a pyrophoric layer 6 which passes through the molten charge. As shown in FIG. 2, an embodiment is to add coke to the lower reaction body 1 through a nozzle disposed at the top of the lower reaction body 1, coke. The particle size ranges from 1 to 11 mm, and is rapidly heated in the lower reaction body 1, and the heated coke particles fall on the surface of the molten pool 2 to form a porous carbon material-coke filter layer 6. If the blockiness is less than 1mm, the coke will lose faster at high temperature, but the particle size of more than 11mm will make the center of the coke not be heated to a sufficient temperature, and the excessive particle size will make the gap between the coke particles larger, which will lead to the passage. Loss of the recovery of the metal oxide melt to be smelted by the pyrophoric layer 6. The coke filter layer 6 can also be realized by spraying a pulverized coal suitable for coking, and after the pulverized coal is burned off at a high temperature, coke particles can be formed.

According to one embodiment of the invention, the focal filter layer space is 50-250 mm high, preferably 100-200 mm, as shown in FIG. According to the difficulty of carbon reduction of the metal to be smelted, the thickness of the pyrophoric layer is appropriately adjusted by adjusting the speed at which coke or pulverized coal is added to the lower reaction body 1.

In accordance with an embodiment of the present invention, each of the molten pools 2 is provided with a side blowing arrangement for injecting a carbonaceous fuel and an oxygen containing gas into the molten pool 2, as shown in Figures 3-4 and 6-11.

According to an embodiment of the present invention, the position of the side blowing arrangement corresponds to the lower middle portion of the slag layer in the molten pool, and the side blowing is provided. Placed in the lower part of the slag layer, the slag can be convected or tumbling, which facilitates the exchange of heat and substances between the upper and lower layers, thereby reducing the viscosity of the melt and improving the metal recovery rate.

According to one embodiment of the invention, the number of ascending flues 3 coincides with the number of molten pools 2, as shown in Figures 10 and 11.

According to an embodiment of the invention, the number of molten pools 2 is 1-4. The setting of 1-4 molten pools 2 in the flash furnace can meet the needs of different smelting production.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

A tandem flash furnace characterized by comprising an upper reaction body (5), a lower reaction body (1) and a connecting passage (7) communicating the two, the upper reaction body (5) being located in the lower reaction body The upper part of (1) forms a tandem structure, and the lower part of the lower reaction body (1) is provided with at least one molten pool (2); the flash furnace further includes a rising flue (3) for discharging flue gas, The rising flue (3) is in communication with the lower reaction body (1) through the molten pool (2), and each of the molten pools (2) is provided with a slag discharge port.
The tandem flash furnace according to claim 1, characterized in that the inner width of the connecting passage (7) is not more than 2/3 of the inner diameter of the lower reaction body (1) and the length is not more than 2 m.
The tandem flash furnace according to any one of claims 1-2, characterized in that the connecting channel (7) is provided with a feeding device.
The tandem flash furnace according to claim 3, characterized in that the upper reaction body (5) is provided with a spray gun or a nozzle for blowing an oxygen-containing gas and a gasifying agent into the upper reaction body (5).
The tandem flash furnace according to claim 1, characterized in that the upper portion of the space in the molten pool (2) containing the melt is provided with a space of the pyrophoric layer through which the molten charge falls.
A tandem flash furnace according to claim 5, wherein said pyrophoric layer has a space of 50-250 mm.
A tandem flash furnace according to claim 1, characterized in that each of said molten pools (2) is provided with a side blowing arrangement for injecting fuel and oxygen-containing gas into said molten pool (2).
The tandem flash furnace according to claim 7, wherein the position of the side blowing arrangement corresponds to a lower middle portion of the slag layer in the molten pool.
The tandem flash furnace according to claim 1, characterized in that the number of the molten pools (2) is 1-4.
A method of smelting using the flash furnace of claims 1-9.