CN212247149U - Suspension smelting electric heating reduction furnace - Google Patents

Suspension smelting electric heating reduction furnace Download PDF

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Publication number
CN212247149U
CN212247149U CN202020559561.6U CN202020559561U CN212247149U CN 212247149 U CN212247149 U CN 212247149U CN 202020559561 U CN202020559561 U CN 202020559561U CN 212247149 U CN212247149 U CN 212247149U
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suspension smelting
zone
smelting
electric heating
reduction
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李东波
黎敏
邓兆磊
尉克俭
茹洪顺
曹珂菲
吴卫国
许良
宋言
苟海鹏
冯双杰
李兵
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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Abstract

The utility model discloses a suspension smelting electric heating reduction furnace, which comprises a suspension smelting electric heating reduction furnace body, wherein a suspension smelting area and an electric heating reduction area are defined in the suspension smelting electric heating reduction furnace body, a partition wall is arranged between the suspension smelting area and the electric heating reduction area, and the bottoms of the suspension smelting area and the electric heating reduction area are communicated; the smelting zone is provided with an auxiliary burner, a material nozzle, an oxygen-containing gas nozzle and a smelting flue gas outlet, and the electric heating reduction zone is provided with an electrode, a reducing agent spray gun, a zinc-containing steam outlet, a slag discharge port and a metal melt outlet. Therefore, the suspension smelting electric heating reduction furnace can realize short-flow and low-energy consumption treatment of zinc concentrate, valuable metals such as lead, iron, silver, indium, germanium and the like are comprehensively recovered, the zinc element has higher direct yield, and the obtained slag has low yield and can be directly sold as common solid waste.

Description

Suspension smelting electric heating reduction furnace
Technical Field
The utility model belongs to the metallurgical field, concretely relates to electric heat reduction furnace is smelted in suspension.
Background
Metallic zinc is an important raw material for industry and agriculture. With the progress of society and the development of human beings, the world demand for zinc resources is rapidly increased, and the consumption of zinc raw materials is huge. At present, zinc smelting is mainly carried out by a wet process, zinc concentrate is leached after being roasted or treated by other means, zinc sulfate solution is obtained, cathode zinc sheets are obtained through liquid purification and electrolytic deposition, and Zn99.995 zinc ingots are obtained through zinc casting. The process has more procedures, complex process, huge investment and high energy consumption, and the direct current power consumption per ton of zinc in a single electrodeposition procedure reaches 3000 kWh. Most importantly, a large amount of leaching slag, iron slag and the like are generated in the wet process, the yield of the leaching slag and the iron slag exceeds 50%, the slag belongs to dangerous waste, and needs to be subjected to harmless treatment, so that a large amount of energy consumption is caused, and new pollution is brought.
Blast furnaces, vertical pots and electric furnaces are the only existing pyrometallurgical zinc-smelting processes at present, and the energy consumption is generally high. Blast furnaces and vertical tanks have high requirements on raw material components and complex material preparation process; the electric furnace needs to control the atmosphere and temperature in the furnace to prevent the large amount of reduction of iron; the zinc direct recovery rate of the three pyrometallurgical zinc smelting processes is lower, the zinc content of blast furnace slag and electric furnace slag is high, and the total zinc recovery rate is low. At present, the capacity of a single blast furnace can reach more than 10 ten thousand tons of zinc per year, and the capacity of a single series of vertical tanks and electric furnaces is only thousands of tons per year, so that the requirement of modern large-scale industrial production can not be met completely.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a suspension smelting electrothermic reduction furnace, which can realize short-flow and low-energy consumption processing of zinc concentrate, and comprehensively recover valuable metals such as lead, iron, silver, indium and germanium, and the zinc element has a higher direct recovery rate, and the obtained slag has a low yield rate, and can be sold directly as general solid waste.
In one aspect of the present invention, the present invention provides a suspension smelting electric heating reduction furnace. According to the utility model discloses an embodiment, suspension smelting electric heat reduction furnace includes:
the suspension smelting electric heating reduction furnace comprises a suspension smelting electric heating reduction furnace body, wherein a suspension smelting area and an electric heating reduction area are defined in the suspension smelting electric heating reduction furnace body, a partition wall is arranged between the suspension smelting area and the electric heating reduction area, and the bottom of the suspension smelting area is communicated with the bottom of the electric heating reduction area;
the auxiliary burner is arranged at the top of the suspension smelting zone;
the material nozzle is arranged at the top of the suspension smelting zone;
the oxygen-containing gas nozzle is arranged in the suspension smelting zone;
a smelting flue gas outlet, which is arranged on the suspension smelting zone;
the electrode extends into the electrothermal reduction zone from the top of the electrothermal reduction zone;
the reducing agent spray gun is arranged at the top of the electric heating reduction zone;
the zinc-containing steam outlet is arranged in the electrothermal reduction area;
the slag discharging port is arranged at the bottom of the electric heating reduction zone;
and the metal melt outlet is arranged at the bottom of the electric heating reduction zone.
According to the utility model discloses suspension smelting electrothermal reduction furnace, through at this internal partition wall that sets up of suspension smelting electrothermal reduction furnace, this partition wall is suspension smelting electrothermal reduction furnace internal interval for suspension smelting district and electrothermal reduction district with suspension smelting district, and suspension smelting district and electrothermal reduction district bottom intercommunication, set up oxygen-containing gas nozzle and supplementary combustor simultaneously at suspension smelting district top, set up the electrode in electrothermal reduction district, reductant spray gun and zinciferous steam outlet, supply the suspension smelting district to suspension smelting electrothermal reduction furnace with the mixture after zinc concentrate mixes with zinc dross and flux, only to suspension smelting district jetting oxygen-containing gas through oxygen-containing gas nozzle, make oxygen-containing gas and zinc concentrate combustion heat supply carry out the oxidation smelting, high-efficient oxidation desulfurization takes place for the mixture, obtain sulphur-containing smelting flue gas, and SiO in the mixture2And the slag is formed, and the formed molten high-zinc slag directly enters an electrothermal reduction area to be reduced to obtain zinc-containing steam and metal melt. Therefore, the efficient suspension smelting furnace and the electrothermal reduction furnace are integrally designed, the occupied area is small, the configuration height difference is reduced, and the smelting furnace and the electrothermal reduction furnace are reducedThe construction investment of a factory building is reduced, the operation of discharging and adding the melt is reduced, the production operation rate is improved, and the consumption of operators and corresponding tools and appliances can be reduced; smelting and reduction are completed in one furnace, and the electric heating reduction zone can also maintain a certain temperature by using the high temperature of the smelting zone, so that the consumption of electric energy during the independent reduction operation is reduced; in addition, the melting bath gives consideration to smelting and reduction operations, the amount of the stored molten metal in the furnace is relatively large, the liquid storage time can be increased, the single-furnace processing capacity is favorably improved, the recovery rate of zinc is improved, and lead, iron, indium, germanium and the like can be simultaneously recovered, and the higher recovery rate is ensured. Specifically, the zinc concentrate processing capacity of the single suspension smelting electrothermal reduction furnace meets various scales of 1-30 ten thousand tons/year and the like, the zinc content of the obtained slag in the electrothermal reduction area is reduced to 0.5-1 wt%, and the yield of the obtained slag is low, so that the slag can be directly sold as common solid waste.
In addition, the suspension smelting electric heating reduction furnace according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the present invention, the suspension smelting zone is a vertical furnace body.
In some embodiments of the present invention, the bottom of the suspension smelting zone and the bottom of the electrothermal reduction zone are stepped down in the direction from the suspension smelting zone to the electrothermal reduction zone. Therefore, the high zinc slag in a molten state obtained in the suspension smelting zone can directly flow into the electrothermal reduction zone by gravity, so that the operation of discharging and adding the melt is reduced, and the production operation rate is improved.
In some embodiments of the present invention, the suspension smelting electric reduction furnace further includes: and the carbonaceous fuel spray gun is arranged in the suspension smelting zone. Thus, the suspension smelting zone smelting efficiency can be improved.
In some embodiments of the present invention, the suspension smelting electrothermal reduction furnace further comprises a plurality of the oxygen-containing gas nozzles, and the plurality of the oxygen-containing gas nozzles are uniformly arranged at the top of the suspension smelting zone.
In some embodiments of the present invention, the above-mentioned electrothermal reduction furnace for suspension smelting further comprises a plurality of said electrodes, and said plurality of electrodes are uniformly distributed in said electrothermal reduction region. Therefore, the temperature in the electric heating reduction zone can be ensured to be uniform.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic longitudinal sectional structure view of a suspension smelting electric heating reduction furnace according to an embodiment of the present invention;
FIG. 2 is a B-B diagram of a suspension smelting electrothermic reduction furnace according to an embodiment of the present invention;
FIG. 3 is a A-A diagram of a suspension smelting electrothermic reduction furnace according to an embodiment of the present invention;
FIG. 4 is a schematic flow diagram of a method for smelting zinc concentrate in a suspension smelting electrothermic reduction furnace according to an embodiment of the present invention;
FIG. 5 is a schematic flow diagram of a method for smelting zinc concentrate in a suspension smelting electrothermic reduction furnace according to yet another embodiment of the present invention;
FIG. 6 is a schematic flow diagram of a method for smelting zinc concentrate in a suspension smelting electrothermic reduction furnace according to yet another embodiment of the present invention;
fig. 7 is a schematic flow chart of a method for smelting zinc concentrate by using a suspension smelting electrothermic reduction furnace according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the present invention, the present invention provides a suspension smelting electric heating reduction furnace. According to an embodiment of the present invention, referring to fig. 1 to 3, the suspension smelting electrothermic reduction furnace includes a suspension smelting electrothermic reduction furnace body 100, a suspension smelting zone 11 and an electrothermic reduction zone 12 are defined in the suspension smelting electrothermic reduction furnace body 100, a partition wall 13 is provided between the smelting zone 11 and the electrothermic reduction zone 12, and the bottoms of the suspension smelting zone 11 and the electrothermic reduction zone 12 are communicated. Specifically, unreacted raw materials are blocked by a partition wall 13 between the suspension smelting zone 11 and the electric heating reduction zone 12, meanwhile, smoke generated by the suspension smelting zone 11 and zinc-containing steam generated by the electric heating reduction zone 12 are completely separated, and only the bottom of the suspension smelting zone 11 is communicated with the bottom of the electric heating reduction zone 12.
According to the embodiment of the present invention, referring to fig. 1-2, the suspension smelting zone 11 is provided with an auxiliary burner 111, a material nozzle 112, an oxygen-containing gas nozzle 113 and a smelting fume outlet 114, preferably, the auxiliary burner 111 is arranged at the top of the suspension smelting zone 11 (used when the auxiliary burner 111 is opened and baked and is stopped for heat preservation), the material nozzle 112 is also arranged at the top of the suspension smelting zone 11, the oxygen-containing gas nozzle 113 is arranged at the top of the suspension smelting zone 11, and the smelting fume outlet 114 is arranged at the top and/or side wall of the suspension smelting zone 11. Specifically, a mixture of zinc concentrate (zinc concentrate is at least one selected from zinc sulfide concentrate and lead-zinc complex ore), zinc slag (zinc slag is wet zinc leaching residue) and flux (flux is at least one selected from siliceous flux, calcareous flux and iron flux) is supplied to the suspension smelting zone 11 in the suspension smelting electrothermal reduction furnace through the material nozzle 112, and oxygen-containing gas is blown only to the suspension smelting zone 11 through the oxygen-containing gas nozzle 113 (the volume concentration of oxygen in the oxygen-containing gas is not less than 80%, the suspension smelting zone 11 is maintainedThe temperature is 1200-1400 ℃, so that the oxygen-containing gas and the zinc concentrate are combusted to supply heat for oxidation smelting, the mixture is subjected to efficient oxidation desulfurization, sulfur-containing smelting flue gas (the volume concentration of sulfur dioxide in the smelting flue gas is not less than 10%) is obtained, and SiO in the mixture2The slag is involved in slag forming to form molten high zinc slag (the slag type of the high zinc slag is ZnO-FeO-SiO)2Type, ZnO-FeO-SiO2CaO type, ZnO-FeO-SiO2CaO-ZnO type) directly into the electrothermal reduction zone 12.
Further, the furnace type of the suspension smelting zone 11 can be selected by those skilled in the art according to actual needs, and preferably, the suspension smelting zone 11 is a shaft furnace body. Meanwhile, carbonaceous fuel injection lances (not shown) may be disposed on the suspension smelting zone 11 according to actual needs to inject carbonaceous fuel into the suspension smelting zone 11 to supplement heat for the suspension smelting zone 11, the preferred carbonaceous fuel may be at least one of natural gas, pulverized coal and high calorific value gas, and a person skilled in the art may select specific arrangement positions of the carbonaceous fuel injection lances according to actual needs, for example, the carbonaceous fuel injection lances may be disposed on the top of the suspension smelting zone 11, and a plurality of oxygen-containing gas nozzles 113 may be disposed on the top of the suspension smelting zone 11, and a plurality of oxygen-containing gas nozzles 112 may be symmetrically disposed on the top of the suspension smelting zone 11. Preferably, the material injection nozzles 112 are in communication with the oxygen-containing gas injection nozzles 113, i.e. the material is injected into the suspension smelting zone 11 using an oxygen-containing gas as a carrier gas.
According to the embodiment of the present invention, referring to fig. 1 and 3, the electrothermal reduction zone 12 is provided with an electrode 121, a reducing agent spray gun 122, a zinc-containing steam outlet 123, a slag discharge port 124 and a metal melt outlet 125. Preferably, the electrode 121 extends into the electrothermal reduction zone 12 from the top of the electrothermal reduction zone 12, and the reducing agent spray gun 122 is arranged at the top of the electrothermal reduction zone 12; the zinc-containing steam outlet 123 is arranged at the top of the electrothermal reduction zone 12; the slag discharge port 124 is arranged at the bottom of the electric heating reduction zone 12; the molten metal outlet 125 is arranged at the bottom of the electrothermal reduction zone 12. Specifically, the temperature of the electrothermal reduction region 12 is maintained at 1200-1600 ℃ under the heating of the electrode 121, a reducing agent (coke and/or natural gas) is blown into the electrothermal reduction region 12 through a reducing agent spray gun 122, meanwhile, molten high-zinc slag formed in the suspension smelting region 11 directly enters the electrothermal reduction region 12 to be in contact with the reducing agent for reduction, and most of indium, germanium and the like in the high-zinc slag are enriched along with the volatilization of zinc vapor. The obtained zinc-containing steam is discharged from a zinc-containing steam outlet 123 arranged at the electrothermal reduction area 12 and then enters a condensation system to produce crude zinc, meanwhile, iron, lead and the like in high zinc slag can be reduced in the electrothermal reduction area 12 to obtain a metal melt containing iron and lead, the rest slag (containing 0.5-1 wt% of zinc) is discharged from a slag discharge opening 124 arranged at the bottom of the electrothermal reduction area 12, the slag is sold to building material enterprises to produce building materials such as cement after being crushed by water, and the metal melt is discharged from a metal melt outlet 125 arranged at the bottom of the electrothermal reduction area 12. It should be noted that, the 12 slag discharge port 124 and the metal melt outlet 125 of the electrothermal reduction zone of the present application may be the same port or two separate ports, and those skilled in the art can set them according to actual needs, and are not described herein again.
Furthermore, in the direction from the suspension smelting zone 11 to the electrothermal reduction zone 12, the bottom of the suspension smelting zone 11 and the bottom of the electrothermal reduction zone 12 are gradually reduced in a stepped manner, so that the molten high-zinc slag obtained from the suspension smelting zone 11 can directly flow into the electrothermal reduction zone 12 by gravity, the discharge and addition operation of the high-zinc slag is reduced, and the production operation rate is improved. Meanwhile, the height of the furnace bottom step between the suspension smelting zone 11 and the electrothermal reduction zone 12 can be set by those skilled in the art according to actual needs. In addition, a plurality of electrodes 121 are disposed on the electrothermal reduction region 12, and the plurality of electrodes 121 are uniformly distributed on the electrothermal reduction region 12. Therefore, the temperature in the electric heating reduction zone can be ensured to be uniform. And the electric heating reduction zone 12 is designed with a good furnace body sealing structure according to the process characteristics of zinc volatilization, and the suspension smelting zone 11 and each part of the electric heating reduction zone 12 adopt different cooling modes according to the requirements and adopt an integral elastic framework furnace type to ensure the service life of the furnace body.
According to the utility model discloses suspension smelting electrothermal reduction furnace, through at this internal partition wall that sets up of suspension smelting electrothermal reduction furnace, this partition wall will be this internal interval of suspension smelting electrothermal reduction furnace for suspension smelting district and electric heat reduction district to suspension smelting district and electric heat reduction district bottom intercommunication set up oxygen-containing gas nozzle and electric heat reduction district bottom the suspension smelting simultaneously at suspension smelting district topAn auxiliary burner, wherein an electrode, a reducing agent spray gun and a zinc-containing steam outlet are arranged in an electric heating reduction zone, a mixture obtained by mixing zinc concentrate, zinc slag and a flux is supplied to a suspension smelting zone in a suspension smelting electric heating reduction furnace, an oxygen-containing gas is only sprayed to the suspension smelting zone through an oxygen-containing gas nozzle, so that the oxygen-containing gas and the zinc concentrate are combusted to supply heat for oxidation smelting, the mixture is subjected to efficient oxidation desulfurization to obtain sulfur-containing smelting flue gas, and SiO in the mixture is oxidized to obtain sulfur-containing smelting flue gas2And the slag is formed, and the formed molten high-zinc slag directly enters an electrothermal reduction area to be reduced to obtain zinc-containing steam and metal melt. Therefore, the efficient suspension smelting furnace and the electrothermal reduction furnace are integrally designed, so that the occupied area is small, the configuration height difference is reduced, the construction investment of the smelting furnace and a factory building is reduced, the operation of discharging and adding the melt is reduced, the production operation rate is improved, and the consumption of operators and corresponding tools and appliances can be reduced; smelting and reduction are completed in one furnace, and the electric heating reduction zone can also maintain a certain temperature by using the high temperature of the smelting zone, so that the consumption of electric energy during the independent reduction operation is reduced; in addition, the melting bath gives consideration to smelting and reduction operations, the amount of the stored molten metal in the furnace is relatively large, the liquid storage time can be increased, the single-furnace processing capacity is favorably improved, the recovery rate of zinc is improved, and lead, iron, indium, germanium and the like can be simultaneously recovered, and the higher recovery rate is ensured. Specifically, the zinc concentrate processing capacity of the single suspension smelting electrothermal reduction furnace meets various scales of 1-30 ten thousand tons/year and the like, the zinc content of the obtained slag in the electrothermal reduction area is reduced to 0.5-1 wt%, and the yield of the obtained slag is low, so that the slag can be directly sold as common solid waste.
For convenience of understanding, a method of smelting zinc concentrate using the above-described suspension smelting electrothermic reduction furnace will be described below. According to an embodiment of the present invention, referring to fig. 4, the method includes:
s100: mixing zinc concentrate, zinc slag and flux
In the step, the zinc concentrate, the zinc slag and the flux are mixed according to the mass ratio of iron to silicon in the mixed mixture of 1.0-1.5 or the mass ratio of calcium to silicon of 0.3-0.5. Specifically, the flux is at least one of a siliceous flux, a calcareous flux and an iron flux, for example, the siliceous flux is quartz stone, the calcareous flux is limestone, the iron flux is ferrous oxide, the zinc concentrate is at least one selected from zinc sulfide concentrate and lead-zinc composite ore, and the zinc slag is wet zinc leaching slag.
S200: the mixture obtained in the step S100 is supplied to a suspension smelting zone of the suspension smelting electrothermal reduction furnace through a material nozzle, so that the mixture is smelted and reduced in the suspension smelting zone and the electrothermal reduction zone in sequence
In the step, the mixture obtained in the step S100 is supplied to a suspension smelting zone 11 of the suspension smelting electrothermal reduction furnace through a material nozzle 112, meanwhile, oxygen-containing gas is only blown to the suspension smelting zone 11 through an oxygen-containing gas nozzle 113 (the temperature of the smelting zone 11 is maintained at 1200-1400 ℃), and the oxygen-containing gas (the volume concentration of oxygen in the oxygen-containing gas is not less than 80%) is controlled, so that the oxygen-containing gas and zinc concentrate are combusted to supply heat for oxidation smelting, the mixture is subjected to efficient oxidation desulfurization, sulfur-containing smelting flue gas (the volume concentration of sulfur dioxide in the smelting flue gas is not less than 10%) is obtained2The slag is involved in slag forming to form molten high zinc slag (the slag type of the high zinc slag is ZnO-FeO-SiO)2Type, ZnO-FeO-SiO2CaO type, ZnO-FeO-SiO2-CaO-ZnO type) directly enters the electrothermal reduction zone 12, the electrothermal reduction zone 12 maintains the temperature of 1200-1600 ℃ under the heating of the electrode 121 (the temperature is 1200-1400 ℃, lead is reduced in the electrothermal reduction zone 12 to obtain crude lead, most of indium, germanium and the like are enriched along with the volatilization of zinc vapor, the operation temperature is increased to about 1450-1600 ℃, pig iron can be discharged from the furnace, the increase of the operation temperature of the electrothermal reduction zone is beneficial to the more efficient and thorough reduction and volatilization of zinc, indium, germanium and the like, a reducing agent (coke and/or natural gas) is blown into the electrothermal reduction zone 12 through a reducing agent spray gun 123, meanwhile, molten high zinc slag formed in the suspension smelting zone 11 directly enters the electrothermal reduction zone 12 to be reduced along with the contact of the reducing agent, and most of indium, germanium and the like in the high zinc slag are enriched along with the volatilization of the zinc vapor. The obtained zinc-containing steam is discharged from a zinc-containing steam outlet 123 arranged in the electric heating reduction zone and enters a condensing system to produce crude zinc, and simultaneouslyIron, lead and the like in the high zinc slag can be reduced in the electric heating reduction area 12 to obtain metal melt, the residual slag (the slag contains 0.5-1 wt% of zinc) is discharged from a slag discharge port 124 at the bottom of the electric heating reduction area 12, the slag is sold to building material enterprises to produce building materials such as cement after being crushed by water, and the metal melt containing iron and lead is discharged from a metal melt outlet 125 at the bottom of the electric heating reduction area 12.
Further, according to actual needs, carbonaceous fuel can be injected into the suspension smelting zone 11 through a carbonaceous fuel spray gun arranged on the suspension smelting zone 11 to participate in combustion so as to supplement heat for the suspension smelting zone 11, and the preferred carbonaceous fuel can be at least one of natural gas, pulverized coal and high-calorific-value gas.
According to the utility model discloses method for smelting zinc concentrate, the mixture after mixing zinc concentrate with zinc dross and flux is supplied to the suspension smelting district in above-mentioned suspension smelting electrothermal reduction furnace, only blows oxygenous gas to suspension smelting district through oxygenous gas nozzle for oxygenous gas and zinc concentrate combustion heat supply carry out the oxidation smelting, and high-efficient oxidation desulfurization takes place for the mixture, obtains the smelting flue gas that contains sulphur, and SiO in the mixture2And the slag is formed, and the formed molten high-zinc slag directly enters an electrothermal reduction area to be reduced to obtain zinc-containing steam and metal melt. Therefore, the suspension smelting electric heating reduction furnace is adopted to smelt zinc concentrate, so that the occupied area is small, the configuration height difference is reduced, the construction investment of the smelting furnace and a workshop is reduced, the operation of discharging and adding melt is reduced, the production operation rate is improved, and the consumption of operators and corresponding tools and appliances can be reduced; smelting and reduction are completed in one furnace, and the electric heating reduction zone can also maintain a certain temperature by using the high temperature of the smelting zone, so that the consumption of electric energy during the independent reduction operation is reduced; in addition, the melting bath gives consideration to smelting and reduction operations, the amount of the stored molten metal in the furnace is relatively large, the liquid storage time can be increased, the single-furnace processing capacity is favorably improved, the recovery rate of zinc is improved, and lead, iron, indium, germanium and the like can be simultaneously recovered, and the higher recovery rate is ensured.
Further, referring to fig. 5, the method for smelting zinc concentrate further includes:
s300: the smelting flue gas is subjected to waste heat recovery and dust removal and then is subjected to acid making
In this step, the sulfur-containing smelting flue gas obtained in the suspension smelting zone 11 is subjected to waste heat recovery and dust removal, for example, a waste heat boiler can be used for waste heat recovery, electric dust removal is used in the dust removal process, so that the waste heat of the smelting flue gas can be recycled, and the residual gas enters an acid making system for acid making, thereby realizing resource utilization of the smelting flue gas. It should be noted that the acid making process is a conventional operation in the prior art, and is not described herein again.
Further, referring to fig. 6, the method for smelting zinc concentrate further includes:
s400: condensing the zinc-containing vapor
In this step, the zinc-containing steam obtained in the electrothermal reduction zone 12 is condensed to obtain crude zinc, crude lead and flue gas. It should be noted that, a person skilled in the art may select specific operating conditions of the condensation process according to actual needs, as long as separation of zinc and lead can be achieved, and details are not described herein.
S500: purifying the flue gas and supplying the gas to the suspension smelting zone
In this step, the flue gas obtained by the condensation is purified to obtain a coal gas, and the coal gas is supplied to the suspension smelting zone 11 to be used as a carbonaceous fuel. Therefore, the resource utilization of the flue gas is realized. It should be noted that, those skilled in the art can select specific operations of the flue gas purification process according to actual needs, and details are not described herein.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
Referring to FIG. 7, zinc concentrate (Zn: 50.1 wt%), solvent (FeO, SiO)2And CaO) and zinc slag (Zn-containing: 19.7 wt%) according to the mass ratio of 7:1:2, drying and screening, spraying the obtained mixture and industrial pure oxygen into a suspension smelting zone from a material nozzle at the top of the suspension smelting zone of the suspension smelting electrothermal reduction furnace,then the zinc concentrate is contacted with oxygen-enriched air for oxidation smelting (the smelting temperature is 1200 ℃) to obtain sulfur-containing smelting smoke and high zinc slag, the smoke in the suspension smelting zone of the suspension smelting electric heating reduction furnace is cooled by a waste heat boiler, dust is collected by an electric dust collector and then is sent to the smoke for acid making, and the slag type of the obtained high zinc slag is ZnO-FeO-SiO2Type, ZnO-FeO-SiO2CaO type, ZnO-FeO-SiO2And (2) a CaO-ZnO type, wherein the high-zinc slag is placed into an electrothermal reduction zone of the suspension smelting electrothermal reduction furnace through a communication channel between the partition wall and the bottom wall of the furnace body, and is subjected to electrothermal reduction under the heating action of the heating electrode and the reduction action of the reducing agent coke (the temperature of the electrothermal reduction zone is 1200 ℃) to obtain zinc-containing steam and slag, the zinc-containing steam comprises zinc steam, lead steam and CO, and the zinc-containing steam is subjected to waste heat recovery and electric precipitation to obtain crude zinc, crude lead and coal gas.
Example 2
The difference from example 1 is that: the smelting temperature of an electrothermal reduction zone of the suspension smelting electrothermal reduction furnace is 1300 ℃.
Example 3
The difference from example 1 is that: the smelting temperature of the electrothermal reduction zone of the suspension smelting electrothermal reduction furnace is 1450 ℃, and zinc-containing steam, furnace slag and lead-containing iron melt are obtained in the electrothermal reduction zone of the suspension smelting electrothermal reduction furnace.
Example 4
The difference from example 3 is that: the smelting temperature of an electrothermal reduction zone of the suspension smelting electrothermal reduction furnace is 1550 ℃.
Example 5
The difference from example 3 is that: the smelting temperature of an electrothermal reduction zone of the electrothermal suspension smelting reduction furnace is 1600 ℃.
Example 6
The difference from example 1 is that: the zinc concentrate is changed into lead-zinc composite ore (containing Zn: 27.9 wt%, containing Pb: 23.1 wt%). And obtaining zinc-containing steam, slag and a lead-containing metal melt in an electrothermal reduction zone of the electrothermal suspension smelting reduction furnace.
Example 7
The difference from example 6 is that: the smelting temperature of an electrothermal reduction zone of the electrothermal suspension smelting reduction furnace is 1300 ℃.
Example 8
The difference from example 6 is that: the smelting temperature of an electrothermal reduction zone of the suspension smelting electrothermal reduction furnace is 1450 ℃, and zinc-containing steam, furnace slag and lead-containing iron melt are obtained in the electrothermal reduction zone of the suspension smelting electrothermal reduction furnace.
Example 9
The difference from example 8 is that: the smelting temperature of an electrothermal reduction zone of the suspension smelting electrothermal reduction furnace is 1550 ℃.
Example 10
The difference from example 8 is that: the smelting temperature of an electrothermal reduction zone of the electrothermal suspension smelting reduction furnace is 1600 ℃.
The recovery rates of zinc and iron elements in the smelting processes of zinc concentrate in examples 1 to 5 are shown in table 1.
TABLE 1
It is understood from comparative examples 1 to 5 that the limitation of the temperature of the electrically heated reduction zone within the range of the present application is advantageous in further improving the recovery rates of metallic zinc and iron.
Examples 6-10 the recovery rates of zinc element, lead element and iron element in the melting methods of lead-zinc composite ores are shown in table 2.
TABLE 2
It is understood from comparative examples 6 to 10 that the limitation of the temperature of the electrically heated reduction zone within the range of the present application is advantageous in further improving the recovery of metallic zinc, lead and iron.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (6)

1. A suspension smelting electrothermal reduction furnace is characterized by comprising:
the suspension smelting electric heating reduction furnace comprises a suspension smelting electric heating reduction furnace body, wherein a suspension smelting area and an electric heating reduction area are defined in the suspension smelting electric heating reduction furnace body, a partition wall is arranged between the suspension smelting area and the electric heating reduction area, and the bottom of the suspension smelting area is communicated with the bottom of the electric heating reduction area;
the auxiliary burner is arranged at the top of the suspension smelting zone;
the material nozzle is arranged at the top of the suspension smelting zone;
the oxygen-containing gas nozzle is arranged in the suspension smelting zone;
a smelting flue gas outlet, which is arranged on the suspension smelting zone;
the electrode extends into the electrothermal reduction zone from the top of the electrothermal reduction zone;
the reducing agent spray gun is arranged at the top of the electric heating reduction zone;
the zinc-containing steam outlet is arranged in the electrothermal reduction area;
the slag discharging port is arranged at the bottom of the electric heating reduction zone;
and the metal melt outlet is arranged at the bottom of the electric heating reduction zone.
2. The suspension smelting electrothermic reduction furnace of claim 1, wherein the suspension smelting zone is a shaft furnace body.
3. The electrothermic reduction furnace for suspension smelting according to claim 1, wherein a bottom of the suspension smelting zone and a bottom of the electrothermic reduction zone are gradually lowered in a stepwise manner in a direction from the suspension smelting zone to the electrothermic reduction zone.
4. The suspension smelting electrothermic reduction furnace according to any one of claims 1 to 3, further comprising: and the carbonaceous fuel spray gun is arranged in the suspension smelting zone.
5. The suspension smelting electrothermic reduction furnace according to claim 4, including a plurality of the oxygen-containing gas nozzles arranged evenly at the top of the suspension smelting zone.
6. The suspension smelting electrothermic reduction furnace of claim 4, comprising a plurality of said electrodes evenly distributed in the electrothermic reduction zone.
CN202020559561.6U 2020-04-15 2020-04-15 Suspension smelting electric heating reduction furnace Active CN212247149U (en)

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