CN111424175A - System and method for smelting zinc concentrate and zinc-containing secondary material - Google Patents

System and method for smelting zinc concentrate and zinc-containing secondary material Download PDF

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Publication number
CN111424175A
CN111424175A CN202010293410.5A CN202010293410A CN111424175A CN 111424175 A CN111424175 A CN 111424175A CN 202010293410 A CN202010293410 A CN 202010293410A CN 111424175 A CN111424175 A CN 111424175A
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China
Prior art keywords
zinc
smelting
jet
area
zone
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CN202010293410.5A
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Chinese (zh)
Inventor
李东波
黎敏
邓兆磊
宋言
茹洪顺
曹珂菲
吴卫国
许良
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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Priority to CN202010293410.5A priority Critical patent/CN111424175A/en
Publication of CN111424175A publication Critical patent/CN111424175A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B4/00Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
    • C22B4/04Heavy metals
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B13/00Making spongy iron or liquid steel, by direct processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B13/00Obtaining lead
    • C22B13/02Obtaining lead by dry processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00Obtaining zinc or zinc oxide
    • C22B19/04Obtaining zinc by distilling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B4/00Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
    • C22B4/08Apparatus
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00General methods of reducing to metals
    • C22B5/02Dry methods smelting of sulfides or formation of mattes
    • C22B5/16Dry methods smelting of sulfides or formation of mattes with volatilisation or condensation of the metal being produced

Abstract

The invention discloses a system and a method for smelting zinc concentrate and zinc-containing secondary materials, wherein the system comprises a mixing unit and a jet smelting electrothermal reduction furnace, wherein the mixing unit is provided with a zinc concentrate inlet, a zinc-containing secondary material inlet, a flux inlet and a mixture outlet; an emergent flow smelting area and an electrothermal reduction area are limited in the jet smelting electrothermal reduction furnace, a partition wall is arranged between the jet smelting area and the electrothermal reduction area, the jet smelting area is communicated with the bottom of the electrothermal reduction area, the jet smelting area is provided with a material inlet, an oxygen-containing gas spray gun and a smelting flue gas outlet, the material inlet is connected with the mixture outlet, and the electrothermal reduction area is provided with an electrode, a reducing agent spray gun, a zinc-containing steam outlet, a slag discharge port and a metal melt outlet. By adopting the system, short-flow and low-energy-consumption treatment of zinc concentrate and zinc-containing secondary materials can be realized, valuable metals such as lead, iron, silver, indium, germanium and the like are comprehensively recovered, and the zinc element has higher direct yield.

Description

System and method for smelting zinc concentrate and zinc-containing secondary material
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a system and a method for smelting zinc concentrate and zinc-containing secondary materials.
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, the consumption of zinc raw materials is huge, and the zinc metal industry faces the crisis of ore-free mining and raw material supply shortage. China is a world large zinc-producing country, produces almost 50% of zinc products with less than 20% of the world zinc resource reserves, and due to over development, the reserves of high-grade zinc blende in China are almost exhausted. Since 2000 years, the net export of zinc in China, including the zinc in alloys, has been on a gradual decrease trend, and the zinc supply in China has been in shortage from surplus. Meanwhile, during the use of the metal zinc, a plurality of zinc-containing secondary materials are generated. The stacking of the secondary material containing zinc occupies a large amount of land and causes serious environmental pollution on one hand, and causes great resource waste on the other hand.
Zinc smelting mainly adopts 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 three kinds of pyrometallurgical zinc smelting processes have low direct zinc recovery rate, high zinc content in blast furnace slag and electric furnace slag and low total zinc recovery rate. 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.
Zinc is one of the better metals recycled in the world at present, zinc-containing secondary materials become important raw materials for zinc production, 30 percent of global zinc is derived from the zinc-containing secondary materials, and the annual output of the regenerated zinc is as high as 290 million tons. However, the utilization of secondary zinc-containing materials in China is late, and the difference from foreign countries is large.
At present, the zinc-containing secondary material is treated mainly by a pyrogenic process and a wet process. The pyrogenic process comprises rotary kiln fuming volatilization (Wilz method), plasma furnace smelting, electric heating shaft furnace smelting, vertical jet flame fuming and the like. The rotary kiln fuming and volatilizing process has the problems of complex material preparation process, large energy consumption, large consumption of reducing agent, large kiln maintenance cost, short service life of refractory materials and the like, and fine cigarette ash needs to be pelletized and dried. The plasma furnace smelting process has the problems of small single-series treatment scale, large electric energy consumption (for example, the electric energy consumption is 1400kWh/t of soot) and large investment and the like. The electric heating shaft furnace smelting process has the problems of long process flow, large investment, large electric energy consumption and the like. The vertical jet flame fuming process has the problems of large investment and the like because an oxygen generator station and an air compressor station need to be built. The wet process mainly comprises alkaline leaching and acid leaching. The alkaline leaching process has the problems of low productivity, secondary pollution caused by difficult treatment of leachate and leaching residues and the like. The acid leaching process has the problems of large equipment investment, secondary pollution caused by difficult treatment of leachate and leaching residues and the like.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one purpose of the invention is to provide a system and a method for smelting zinc concentrate and zinc-containing secondary materials, by adopting the system, short-flow and low-energy-consumption treatment of the zinc concentrate and the zinc-containing secondary materials can be realized, in addition, valuable metals such as lead, iron, silver, indium, germanium and the like are comprehensively recovered, and in addition, the zinc element has higher direct yield.
In one aspect of the invention, a system for smelting zinc concentrate and a zinc-containing secondary material is provided. According to an embodiment of the invention, the system comprises:
the mixing unit is provided with a zinc concentrate inlet, a zinc-containing secondary material inlet, a flux inlet and a mixture outlet;
the jet smelting electric heating reduction furnace is internally provided with an outgoing flow smelting area and an electric heating reduction area, a partition wall is arranged between the jet smelting area and the electric heating reduction area, the jet smelting area is communicated with the bottom of the electric heating reduction area, the jet smelting area is provided with a material inlet, an oxygen-containing gas spray gun and a smelting flue gas outlet, the material inlet is connected with the mixture outlet, and the electric heating reduction area is provided with an electrode, a reducing agent spray gun, a zinc-containing steam outlet, a slag discharge port and a metal melt outlet.
According to the system for smelting the zinc concentrate and the zinc-containing secondary material, provided by the embodiment of the invention, the partition wall is arranged in the jet flow smelting electrothermal reduction furnace, the partition wall separates the interior of the jet flow smelting electrothermal reduction furnace body into a jet flow smelting area and an electrothermal reduction area, and the jet flow smelting electrothermal reduction furnace is provided with the jet flow smelting area and the electrothermal reduction areaThe smelting zone is communicated with the bottom of the electrothermal reduction zone, an oxygen-containing gas spray gun is arranged in the jet smelting zone, an electrode, a reducing agent spray gun and a zinc-containing steam outlet are arranged in the electrothermal reduction zone, a mixed material obtained by mixing zinc concentrate with a zinc-containing secondary material and a flux is supplied to the jet smelting zone in the jet smelting electrothermal reduction furnace, the mixed material is desulfurized and partially melted to obtain sulfur-containing smelting flue gas, and SiO in the mixed material is2And 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 high-efficiency jet 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 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 jet flow 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.
In addition, the system for smelting zinc concentrate and zinc-containing secondary material according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the jet smelting zone is a shaft furnace.
In some embodiments of the invention, the bottom of the jet smelting zone and the bottom of the electrothermal reduction zone are stepped down in the direction from the jet smelting zone to the electrothermal reduction zone. Therefore, the high zinc slag in a molten state obtained in the jet flow smelting zone can directly flow into the electric heating reduction zone by self, so that the operation of discharging and adding the melt is reduced, and the production operation rate is improved.
In some embodiments of the invention, the system further comprises: and the carbonaceous fuel spray gun is arranged in the jet flow smelting zone. Thus, the melting efficiency of the jet melting zone can be improved.
In some embodiments of the invention, the system further comprises: the device comprises a waste heat recovery-dust removal-acid making unit, wherein the waste heat recovery-dust removal-acid making unit is provided with a smelting flue gas inlet and an acid liquid outlet, and the smelting flue gas inlet is connected with the smelting flue gas outlet. Therefore, the resource utilization of the smelting flue gas can be realized.
In some embodiments of the invention, the system further comprises: the condensing unit is provided with a zinc-containing steam inlet, a crude zinc outlet, a crude lead outlet and a flue gas outlet, and the zinc-containing steam inlet is connected with the zinc-containing steam outlet; the purification unit is provided with a flue gas inlet and a coal gas outlet, the flue gas inlet is connected with the flue gas outlet, and the coal gas outlet is connected with the carbonaceous fuel spray gun. Therefore, resource utilization of system materials can be realized.
In a further aspect of the invention, the invention provides a method for smelting zinc concentrate and zinc-containing secondary material by using the system. According to an embodiment of the invention, the method comprises:
(1) feeding zinc concentrate, a zinc-containing secondary material and a flux to the mixing unit for mixing so as to obtain a mixture;
(2) and adding the mixture into a jet flow smelting area of the jet flow smelting electrothermal reduction furnace through the material inlet, so that the mixture is subjected to oxidation smelting with oxygen-containing gas in the jet flow smelting area to obtain smelting smoke and high zinc slag, and supplying the high zinc slag to an electrothermal reduction area of the jet flow smelting electrothermal reduction furnace to be in contact with a reducing agent for reduction treatment so as to obtain zinc-containing steam, metal melt and slag.
According to the method for smelting the zinc concentrate and the zinc-containing secondary material, the mixture obtained by mixing the zinc concentrate, the zinc-containing secondary material and the flux is supplied to the jet smelting area in the jet smelting electrothermal reduction furnace, the mixture is subjected to desulfurization and partial melting and reduction to obtain sulfur-containing smelting smoke, and SiO in the mixture is2Involving in slag formationAnd the formed molten high-zinc slag directly enters an electrothermal reduction region to be reduced to obtain zinc-containing steam and metal melt. Therefore, the high-efficiency jet 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 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 jet flow 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.
In addition, the method for smelting zinc concentrate and zinc-containing secondary material according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, in step (1), the zinc concentrate is at least one selected from the group consisting of zinc sulfide concentrate and lead-zinc complex ore.
In some embodiments of the invention, in step (1), the zinc-containing secondary material is at least one selected from brass, zinc-plated slag, zinc material processing semi-finished waste, steel industry produced steel dust, and chemical industry zinc waste.
In some embodiments of the invention, in step (1), the flux is at least one of a siliceous flux, a calcareous flux, and a ferrous flux.
In some embodiments of the invention, in the step (1), the mass ratio of iron to silicon in the mixture is 1.0 to 1.5 or the mass ratio of calcium to silicon is 0.3 to 0.5.
In some embodiments of the invention, in step (2), the temperature of the oxidative smelting is not less than 1150 ℃.
In some embodiments of the invention, in step (2), the oxygen-containing gas has an oxygen concentration of not less than 50% by volume.
In some embodiments of the invention, in step (2), the reducing agent is at least one selected from the group consisting of coke, coal gas, and natural gas.
In some embodiments of the present invention, in the step (2), the temperature of the reduction treatment is not lower than 1200 ℃, preferably 1450 to 1600 ℃.
In some embodiments of the invention, in step (2), the carbonaceous fuel is supplied to the jet smelting zone using carbonaceous fuel lances for concurrent heating.
In some embodiments of the invention, the method further comprises: (3) and supplying the smelting flue gas to a preheating recovery-dedusting-acid making unit, and making acid after waste heat recovery and dedusting. Therefore, the resource utilization of the smelting flue gas can be realized.
In some embodiments of the invention, the method further comprises: (4) feeding the zinc-containing steam to a condensing unit for condensation so as to obtain crude zinc, crude lead and flue gas; (5) feeding the flue gas to a purification unit for purification in order to obtain a coal gas, and feeding the coal gas to the jet smelting zone for use as the carbonaceous fuel. Therefore, resource utilization of system materials can be realized.
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 view of a system for smelting zinc concentrate and a zinc-containing secondary material according to an embodiment of the present invention;
FIG. 2 is a B-B diagram of a jet smelting electrothermic reduction furnace in a system for smelting zinc concentrate and a zinc-containing secondary material according to an embodiment of the present invention;
FIG. 3 is an A-A diagram of a jet smelting electrothermic reduction furnace in a system for smelting zinc concentrate and a zinc-containing secondary material according to one embodiment of the present invention;
fig. 4 is a schematic view of a system for smelting zinc concentrate and a zinc-containing secondary material according to still another embodiment of the present invention;
fig. 5 is a schematic view of a system for smelting zinc concentrate and zinc-containing secondary material according to still another embodiment of the present invention;
FIG. 6 is a schematic flow diagram of a method of smelting zinc concentrate and a zinc-containing secondary material according to one embodiment of the present invention;
FIG. 7 is a schematic flow diagram of a method of smelting zinc concentrate and a zinc-containing secondary material according to yet another embodiment of the present invention;
fig. 8 is a schematic flow diagram of a method of smelting zinc concentrate and a zinc-containing secondary material according to yet another embodiment of the present invention;
fig. 9 is a schematic flow diagram of a method of smelting zinc concentrate and zinc-containing secondary material according to yet 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 or similar 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 illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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," "secured," and the like are to be construed broadly and can, 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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 invention, a system for smelting zinc concentrate and a zinc-containing secondary material is provided. Referring to fig. 1, the system includes a mixing unit 100 and a jet smelting electrothermic reduction furnace 200.
According to an embodiment of the invention, referring to fig. 1, the mixing unit 100 has a zinc concentrate inlet 101, a zinc containing secondary material inlet 102, a flux inlet 103 and a mix outlet 104 and is adapted to mix the zinc concentrate, the zinc containing secondary material and the flux so as to obtain a mix. Specifically, the zinc concentrate is at least one selected from zinc sulfide concentrate and lead-zinc composite ore; the zinc-containing secondary material is at least one selected from brass, zinc-plated slag, zinc material processing semi-finished waste, steel ash produced in the steel industry and chemical industry zinc waste; the flux is at least one of siliceous flux, calcareous flux and ferrous flux; preferably, the mass ratio of iron to silicon in the mixture is 1.0-1.5 or the mass ratio of calcium to silicon is 0.3-0.5.
According to an embodiment of the present invention, referring to fig. 1, a jet smelting electrothermic reduction furnace 200 defines a jet smelting zone 21 and an electrothermic reduction zone 22 therein, a partition wall 23 is provided between the jet smelting zone 21 and the electrothermic reduction zone 22, and the bottom of the jet smelting zone 21 and the bottom of the electrothermic reduction zone 22 are communicated. Specifically, the separation wall 23 is used for separating unreacted raw materials from the jet smelting zone 21 and the electrothermal reduction zone 22, and meanwhile, the flue gas generated by the jet smelting zone 21 and the zinc-containing steam generated by the electrothermal reduction zone 22 are completely separated, and only the bottom of the jet smelting zone 21 is communicated with the bottom of the electrothermal reduction zone 22.
In accordance with an embodiment of the present invention, and with reference to FIGS. 1-2, jet smelting zone 21 is provided with a material inlet 211, oxygen-containing gas injection lances 212 and a smelt flue gas outlet 213, preferably, material inlet 211 is provided at the top of jet smelting zone 21, oxygen-containing gas injection lances 212 are provided at the side walls of jet smelting zone 21, and smelt flue gas outlet 213 is provided at the top and/or side walls of jet smelting zone 21. Specifically, the mixture obtained by mixing the zinc concentrate, the zinc-containing secondary material and the flux is supplied to a jet smelting zone 21 of the jet smelting electrothermal reduction furnace 200 through a material inlet 211, oxygen-containing gas and fuel are blown to the jet smelting zone 21 through an oxygen-containing gas spray gun 212 to supply heat (the temperature of the smelting zone 11 is maintained to be not lower than 1150), the mixing ratio of the oxygen-containing gas (the volume concentration of oxygen in the oxygen-containing gas is not lower than 50%) and the fuel is controlled, the mixture is subjected to desulfurization reaction and is melted and partially reduced at the same time to obtain sulfur-containing smelting flue gas, and SiO in the mixture is2The slag is formed by the slag forming, and the formed molten high zinc slag (the high zinc slag contains 20 to 60 weight percent of zinc, and the slag type of the high zinc slag is ZnO-FeO-SiO2Type, ZnO-FeO-SiO2CaO type, ZnO-FeO-SiO2CaO-ZnO type) Directly into the electro-thermal reduction zone 22.
Further, the furnace type of the jet smelting zone 21 can be selected by those skilled in the art according to actual needs, and a vertical furnace body is preferably adopted in the jet smelting zone 21. Meanwhile, carbonaceous fuel lances (not shown) may be disposed on the jet smelting zone 21 according to actual needs to inject carbonaceous fuel into the jet smelting zone 21 to participate in combustion to supplement heat for the jet smelting zone 21, preferably, the 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 lances according to actual needs, for example, the carbonaceous fuel lances may be disposed on the top and/or side wall of the jet smelting zone 21, and a plurality of oxygen-containing gas lances 212 may be disposed on the side wall of the jet smelting zone 21, and the plurality of oxygen-containing gas lances 212 may be symmetrically disposed on the side wall of the jet smelting zone 21.
According to an embodiment of the present invention, referring to fig. 1 and 3, the electro-thermal reduction zone 22 is provided with an electrode 221, a reducing agent spray gun 222, a zinc-containing vapor outlet 223, a slag discharge port 224 and a metal melt outlet 225. Preferably, the electrode 221 extends into the electrothermal reduction zone 22 from the top of the electrothermal reduction zone 22, and the reducing agent spray gun 222 is arranged on the top and/or the side wall of the electrothermal reduction zone 22; the zinc-containing steam outlet 223 is arranged at the top of the electrothermal reduction zone 22; the slag discharge port 224 is arranged at the bottom of the electrothermal reduction zone 22; the metal melt outlet 225 is arranged at the bottom of the electrothermal reduction zone 22. Specifically, the temperature of the electrothermal reduction zone 22 is maintained to be not lower than 1200 ℃ under the heating of the electrode 221, preferably 1450-1600 ℃ (the temperature is 1200-1400 ℃, lead is reduced in the electrothermal reduction zone to obtain crude lead, most of indium, germanium and the like are enriched along with the volatilization of zinc steam, the operation temperature is increased to about 1450-1600 ℃, pig iron is reduced and discharged in the furnace, the increase of the operation temperature of the electrothermal reduction zone is beneficial to the more efficient reduction and volatilization of zinc, indium, germanium and the like, a reducing agent (the reducing agent is at least one selected from coke, coal gas and natural gas) is blown into the electrothermal reduction zone 22 through a reducing agent spray gun 222, meanwhile, molten high-zinc slag formed in the jet smelting zone 21 directly enters the electrothermal reduction zone 22 to be reduced by contacting with the reducing agent, and most of indium, germanium and the like in the high-zinc slag are enriched. The obtained zinc-containing steam is discharged from a zinc-containing steam outlet 223 arranged at the electrothermal reduction area 22 and then enters a condensing system to produce crude zinc, meanwhile, iron, lead and the like in high-zinc slag can be reduced in the electrothermal reduction area 22 to obtain a metal melt containing iron and lead, the rest slag (containing 0.1-1 wt% of zinc in the slag) is discharged from a slag discharge port 224 arranged at the bottom of the electrothermal reduction area 22, the slag is sold to building material enterprises to produce building materials such as cement and the like after being crushed by water, and the metal melt containing iron and lead is discharged from a metal melt outlet 225 arranged at the bottom of the electrothermal reduction area 22. It should be noted that, the slag discharge port 224 and the molten metal outlet 225 of the electrothermal reduction zone 22 in the present application may be the same port or two separate ports, and those skilled in the art may set them according to actual needs, and will not be described herein again.
Furthermore, in the direction from the jet smelting zone 21 to the electrothermal reduction zone 22, the bottom of the jet smelting zone 21 and the bottom of the electrothermal reduction zone 22 are gradually reduced in a stepped manner, so that the molten high-zinc slag obtained from the jet smelting zone can directly flow into the electrothermal reduction zone by gravity, the operation of discharging and adding the melt is reduced, and the production operation rate is improved. Meanwhile, the furnace bottom step height between the jet smelting zone 21 and the electrothermal heat exchange zone 22 can be set by a person skilled in the art according to actual needs. In addition, a plurality of electrodes 221 are disposed on the electrothermal reduction region 22, and the plurality of electrodes 221 are uniformly distributed on the electrothermal reduction region 22. Therefore, the temperature in the electric heating reduction zone can be ensured to be uniform. And the electric heating reduction area 22 is designed with a good furnace body sealing structure according to the process characteristics of zinc volatilization, and the parts of the jet smelting area 21 and the electric heating reduction area 22 adopt different cooling modes according to the requirements, and simultaneously, the furnace body is in an integral elastic framework furnace type so as to ensure the service life of the furnace body.
According to the system for smelting the zinc concentrate and the zinc-containing secondary material, provided by the embodiment of the invention, the partition wall is arranged in the jet flow smelting electrothermal reduction furnace, the partition wall separates the interior of the jet flow smelting electrothermal reduction furnace body into a jet flow smelting area and an electrothermal reduction area, the bottom parts of the jet flow smelting area and the electrothermal reduction area are communicated, an oxygen-containing gas spray gun is arranged in the jet flow smelting area, an electrode, a reducing agent spray gun and a zinc-containing steam outlet are arranged in the electrothermal reduction area, and a mixed material obtained by mixing the zinc concentrate, the zinc-containing secondary material and the flux is supplied toIn a jet flow smelting area in the jet flow smelting electric heating reduction furnace, the mixture is desulfurized, partially melted and reduced to obtain sulfur-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 smelting furnace and the electrothermal reduction furnace are designed in an integrated manner, 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 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 jet flow 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 production capacity of the system can meet various scales of 1-20 ten thousand tons/year and the like.
Further, referring to fig. 4, the system for smelting zinc concentrate and zinc-containing secondary material further includes: the waste heat recovery-dust removal-acid making unit 300 is provided with a smelting flue gas inlet 301 and an acid liquor outlet 302, wherein the smelting flue gas inlet 301 is connected with the smelting flue gas outlet 213 and is suitable for carrying out waste heat recovery and dust removal on sulfur-containing smelting flue gas obtained in the jet smelting zone 21, so that the waste heat of the smelting flue gas is recycled, and the residual gas containing sulfur trioxide gas and the like enters an acid making system to make acid, thereby realizing the resource utilization of the smelting flue gas. Specifically, the waste heat recovery-dust removal-acid making unit 300 is composed of a waste heat recovery device, a dust removal device and an acid making device which are connected in sequence, for example, the waste heat recovery device can adopt a waste heat boiler, and the dust removal process adopts electric dust removal. 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. 5, the system for smelting zinc concentrate and zinc-containing secondary material further includes: a condensing unit 400 and a purifying unit 500.
According to an embodiment of the present invention, the condensing unit 400 is provided with a zinc-containing steam inlet 401, a crude zinc outlet 402, a crude lead outlet 403 and a flue gas outlet 404, the zinc-containing steam inlet 401 is connected with the zinc-containing steam outlet 223 and is adapted to condense the zinc-containing steam obtained from the above-mentioned electrothermal reduction zone 22 so as 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.
According to an embodiment of the present invention, the purification unit 500 is provided with a flue gas inlet 501 and a gas outlet 502, wherein the flue gas inlet 501 is connected with the flue gas outlet 404, and the gas outlet 502 is connected with a carbonaceous fuel spray gun (not shown), and is adapted to purify the flue gas obtained after the above condensation to obtain a gas, and supply the gas to the carbonaceous fuel spray gun on the jet smelting zone 21 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.
In a further aspect of the invention, the invention proposes a method for smelting zinc concentrate and zinc-containing secondary material using the above system. According to an embodiment of the invention, referring to fig. 6, the method comprises:
s100: feeding zinc concentrate, zinc-containing secondary material and flux to a mixing unit for mixing
In this step, zinc concentrate, a zinc-containing secondary material and a flux are fed to a mixing unit to be mixed, so that a mixed material is obtained. Specifically, the zinc concentrate is at least one selected from zinc sulfide concentrate and lead-zinc composite ore; the zinc-containing secondary material is at least one selected from brass, zinc-plated slag, zinc material processing semi-finished waste, steel ash produced in the steel industry and chemical industry zinc waste; the flux is at least one of siliceous flux, calcareous flux and ferrous flux; preferably, the mass ratio of iron to silicon in the mixture is 1.0-1.5 or the mass ratio of calcium to silicon is 0.3-0.5.
S200: the mixture obtained in the step S100 is supplied to a jet flow smelting area of the jet flow smelting electrothermal reduction furnace through a material inlet, so that the mixture is smelted and reduced in the jet flow smelting area and the electrothermal reduction area in sequence
In the step, the mixture obtained by mixing the zinc concentrate, the zinc-containing secondary material and the flux is supplied to a jet flow smelting zone 21 of the jet flow smelting electrothermal reduction furnace 200 through a material inlet 211, oxygen-containing gas and fuel are blown to the jet flow smelting zone 21 through an oxygen-containing gas spray gun 212 to supply heat (the temperature of the smelting zone 11 is maintained to be not lower than 1150), the mixing proportion of the oxygen-containing gas (the volume concentration of oxygen in the oxygen-containing gas is not lower than 50 percent) and the fuel is controlled, the mixture is subjected to desulfurization reaction and is melted simultaneously to obtain sulfur-containing smelting flue gas, and SiO in the2The slag is formed by the slag forming, and the formed molten high zinc slag (the high zinc slag contains 20 to 60 weight percent of zinc, and the slag type of the high zinc slag is ZnO-FeO-SiO2Type, ZnO-FeO-SiO2CaO type, ZnO-FeO-SiO2Of the CaO-ZnO type) directly into the electrothermal reduction zone 22. The electric heating reduction zone 22 maintains the temperature not lower than 1200 ℃ under the heating of the electrode 221, preferably 1450-1600 ℃ (when the temperature is 1200-1400 ℃), lead is reduced in the electric heating reduction zone to obtain crude lead, most of indium, germanium and the like are enriched along with the volatilization of zinc steam, the operation temperature is increased to about 1450-1600 ℃, reduction in the furnace is carried out and pig iron is discharged, the operation temperature of the electric heating reduction zone is increased, more efficient reduction and volatilization of zinc, indium, germanium and the like are facilitated, a reducing agent (the reducing agent is at least one selected from coke, coal gas and natural gas) is blown into the electric heating reduction zone 22 through a reducing agent spray gun 222, meanwhile, molten high zinc slag formed in the jet smelting zone 21 directly enters the electric heating reduction zone 22 to be reduced and most of indium, germanium and the like in the high zinc slag are enriched along with the volatilization. The obtained zinc-containing steam is discharged from a zinc-containing steam outlet 223 arranged in the electrothermal reduction area 22 and then enters a condensing system to produce crude zinc, meanwhile, iron, lead and the like in high-zinc slag can be reduced in the electrothermal reduction area 22 to obtain a metal melt containing iron and lead, the rest slag (the slag contains 0.1-1 wt% of zinc) is discharged from a slag discharge port 224 arranged at the bottom of the electrothermal reduction area 22, and the slag is sold to building material enterprises to produce building materials such as cement and the like after being crushed by waterThe material, and the iron-lead containing metal melt is discharged from a metal melt outlet 225 provided at the bottom of the electrically heated reduction zone 22.
Further, according to actual needs, carbonaceous fuel can be injected into the jet smelting zone 21 through a carbonaceous fuel spray gun arranged on the jet smelting zone 21 to participate in combustion so as to supplement heat for the jet smelting zone 21, and the preferred carbonaceous fuel can be at least one of natural gas, pulverized coal and high-calorific-value gas.
According to the method for smelting the zinc concentrate and the zinc-containing secondary material, the mixture obtained by mixing the zinc concentrate, the zinc-containing secondary material and the flux is supplied to the jet smelting area in the jet smelting electrothermal reduction furnace, the mixture is subjected to desulfurization and partial melting and reduction to obtain sulfur-containing smelting smoke, and SiO in the mixture is2And 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 high-efficiency jet 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 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 jet flow 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 production capacity of the system can meet various scales of 1-20 ten thousand tons/year and the like.
Further, referring to fig. 7, the method for smelting zinc concentrate and zinc-containing secondary material further includes:
s300: the smelting flue gas is supplied to a preheating recovery-dust removal-acid making unit for acid making after waste heat recovery and dust removal
In the step, the sulfur-containing smelting flue gas obtained in the jet smelting zone 21 is supplied to a preheating recovery-dedusting-acid making unit for acid making after waste heat recovery and dedusting, so that the sulfur-containing smelting flue gas waste heat is recycled, and the residual gas containing sulfur trioxide gas and the like enters an acid making system for acid making, thereby realizing resource utilization of the smelting flue gas. Specifically, the waste heat recovery-dust removal-acid making unit 300 is composed of a waste heat recovery device, a dust removal device and an acid making device which are connected in sequence, for example, the waste heat recovery device can adopt a waste heat boiler, and the dust removal process adopts electric dust removal. 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. 8, the method for smelting zinc concentrate and zinc-containing secondary material further includes:
s400: feeding the zinc-containing vapor to a condensing unit for condensation
In this step, the zinc-containing steam obtained in the above-mentioned electrically heated reduction zone 22 is supplied to a condensing unit for condensation, so as to obtain crude zinc, crude lead and flue gases. 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: supplying the flue gas to a purification unit for purification and supplying the coal gas to a jet 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 a carbonaceous fuel lance on the jet smelting zone 21 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. 9, zinc concentrate (Zn: 50.1 wt.%), zinc-containing secondary material (steel soot, Zn: 20 wt.%) and flux (FeO, SiO)2And CaO) in a mass ratio of 7:2:1Mixing, directly adding the obtained mixture from a material inlet arranged in a jet flow smelting area of the jet flow smelting electrothermal reduction furnace, spraying oxygen-enriched air (the oxygen volume concentration in the oxygen-enriched air is 80%) from an oxygen-containing gas spray gun in the jet flow smelting area, then contacting the mixture with the oxygen-enriched air to carry out oxidation smelting (the smelting temperature is 1200 ℃) to obtain sulfur-containing smelting smoke and high-zinc slag, cooling the sulfur-containing smelting smoke obtained in the jet flow smelting area by a waste heat boiler, conveying the smoke to an electric dust collector to prepare acid, and obtaining the high-zinc slag with the slag type of ZnO-FeO-SiO2Type, ZnO-FeO-SiO2CaO type, ZnO-FeO-SiO2And (2) CaO-ZnO type, putting the high-zinc slag into an electrothermal reduction zone of the jet flow smelting electrothermal reduction furnace through a communication channel between the partition wall and the bottom wall of the furnace body, simultaneously carrying out electrothermal reduction (at 1250 ℃) under the heating action of the heating electrode and the reduction action of the reducing agent coke to obtain zinc-containing steam and slag, and condensing the zinc-containing steam to obtain crude zinc, crude lead and coal gas.
Example 2
The difference from example 1 is that: the smelting temperature of the electrothermal reduction zone of the jet smelting electrothermal reduction furnace is 1350 ℃.
Example 3
The difference from example 1 is that: the smelting temperature of the electrothermal reduction zone of the jet smelting electrothermal reduction furnace is 1450 ℃, and the zinc-containing steam, the slag and the iron-containing melt are obtained in the electrothermal reduction zone of the jet smelting electrothermal reduction furnace.
Example 4
The difference from example 3 is that: the smelting temperature of an electrothermal reduction zone of the jet 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 jet smelting electrothermal reduction furnace is 1600 ℃.
The recovery of zinc and iron in the smelting process of zinc concentrate and zinc containing secondary material in examples 1 to 5 is shown in table 1.
TABLE 1
From examples 1 to 5, it is understood that limiting the temperature of the electrothermal reduction zone of the jet smelting electrothermal reduction furnace within the range of the present application is advantageous for further improving the recovery rate of metallic zinc and iron.
Example 6
The difference from example 1 is that: the zinc concentrate is changed into lead-zinc composite ore (containing 29.1 wt% of Zn and 23.5 wt% of Pb), the zinc-containing secondary material is changed into galvanized slag (containing 65 wt% of Zn), the jet flow smelting zone of the jet flow smelting electrothermal reduction furnace adopts pure oxygen, the smelting temperature is 1200 ℃, and the electrothermal reduction zone of the jet flow smelting electrothermal reduction furnace obtains zinc-containing steam, slag and lead-containing melt.
Example 7
The difference from example 6 is that: the smelting temperature of an electrothermal reduction zone of the jet smelting electrothermal reduction furnace is 1300 ℃.
Example 8
The difference from example 6 is that: the smelting temperature of an electrothermal reduction zone of the jet smelting electrothermal reduction furnace is 1450 ℃. And obtaining zinc-containing steam, slag and a lead-containing iron melt in an electrothermal reduction zone of the jet smelting electrothermal reduction furnace.
Example 9
The difference from example 8 is that: the smelting temperature of an electrothermal reduction zone of the jet smelting electrothermal reduction furnace is 1500 ℃.
Example 10
The difference from example 8 is that: the smelting temperature of an electrothermal reduction zone of the jet smelting electrothermal reduction furnace is 1600 ℃.
The recovery rates of zinc, lead and iron in the smelting processes of zinc concentrate and zinc-containing secondary material in examples 6 to 10 are shown in table 2.
TABLE 2
From examples 6 to 10, it is understood that limiting the temperature of the electrothermal reduction zone of the jet smelting electrothermal reduction furnace within the range of the present application is advantageous for further improving the recovery rate 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 above, 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 within the scope of the present invention.

Claims (10)

1. A system for smelting zinc concentrate and zinc-containing secondary materials is characterized by comprising the following components:
the mixing unit is provided with a zinc concentrate inlet, a zinc-containing secondary material inlet, a flux inlet and a mixture outlet;
the jet smelting electric heating reduction furnace is internally provided with an outgoing flow smelting area and an electric heating reduction area, a partition wall is arranged between the jet smelting area and the electric heating reduction area, the jet smelting area is communicated with the bottom of the electric heating reduction area, the jet smelting area is provided with a material inlet, an oxygen-containing gas spray gun and a smelting flue gas outlet, the material inlet is connected with the mixture outlet, and the electric heating reduction area is provided with an electrode, a reducing agent spray gun, a zinc-containing steam outlet, a slag discharge port and a metal melt outlet.
2. The system for smelting zinc concentrate and zinc-containing secondary material according to claim 1, wherein the jet smelting zone is a vertical furnace body;
optionally, the bottom of the jet smelting zone and the bottom of the electrothermal reduction zone are gradually reduced in a step manner in the direction from the jet smelting zone to the electrothermal reduction zone.
3. The system for smelting zinc concentrate and zinc-containing secondary material according to claim 1 or 2, further comprising:
and the carbonaceous fuel spray gun is arranged in the jet flow smelting zone.
4. The system for smelting zinc concentrate and zinc-containing secondary material according to claim 1, further comprising:
the device comprises a waste heat recovery-dust removal-acid making unit, wherein the waste heat recovery-dust removal-acid making unit is provided with a smelting flue gas inlet and an acid liquid outlet, and the smelting flue gas inlet is connected with the smelting flue gas outlet.
5. The system for smelting zinc concentrate and zinc-containing secondary material according to claim 3, further comprising:
the condensing unit is provided with a zinc-containing steam inlet, a crude zinc outlet, a crude lead outlet and a flue gas outlet, and the zinc-containing steam inlet is connected with the zinc-containing steam outlet;
the purification unit is provided with a flue gas inlet and a coal gas outlet, the flue gas inlet is connected with the flue gas outlet, and the coal gas outlet is connected with the carbonaceous fuel spray gun.
6. A method for smelting zinc concentrate and zinc-containing secondary material using the system of any one of claims 1 to 5, comprising:
(1) feeding zinc concentrate, a zinc-containing secondary material and a flux to the mixing unit for mixing so as to obtain a mixture;
(2) and adding the mixture into a jet flow smelting area of the jet flow smelting electrothermal reduction furnace through the material inlet, so that the mixture is subjected to oxidation smelting with oxygen-containing gas in the jet flow smelting area to obtain smelting smoke and high zinc slag, and supplying the high zinc slag to an electrothermal reduction area of the jet flow smelting electrothermal reduction furnace to be in contact with a reducing agent for reduction treatment so as to obtain zinc-containing steam, metal melt and slag.
7. The method according to claim 6, wherein in step (1), the zinc concentrate is at least one selected from the group consisting of zinc sulfide concentrate and lead-zinc complex ore;
optionally, in the step (1), the zinc-containing secondary material is at least one selected from brass, zinc-plated slag, zinc material processing semi-finished waste, steel industry steel ash and chemical industry zinc waste;
optionally, in step (1), the flux is at least one of a siliceous flux, a calcareous flux and an iron flux;
optionally, in the step (1), the mass ratio of iron to silicon in the mixture is 1.0-1.5 or the mass ratio of calcium to silicon is 0.3-0.5.
8. The method of claim 6, wherein in step (2), the temperature of the oxidative smelting is not lower than 1150 ℃;
optionally, in the step (2), the oxygen volume concentration in the oxygen-containing gas is not lower than 50%;
optionally, in the step (2), the reducing agent is at least one selected from coke, coal gas and natural gas;
optionally, in the step (2), the temperature of the reduction treatment is not lower than 1200 ℃, preferably 1450-1600 ℃;
optionally, in step (2), supplying carbonaceous fuel to the jet smelting zone for concurrent heating using carbonaceous fuel lances.
9. The method of claim 8, further comprising:
(3) and supplying the smelting flue gas to a preheating recovery-dedusting-acid making unit, and making acid after waste heat recovery and dedusting.
10. The method of claim 9, further comprising:
(4) feeding the zinc-containing steam to a condensing unit for condensation so as to obtain crude zinc, crude lead and flue gas;
(5) feeding the flue gas to a purification unit for purification in order to obtain a coal gas, and feeding the coal gas to the jet smelting zone for use as the carbonaceous fuel.
CN202010293410.5A 2020-04-15 2020-04-15 System and method for smelting zinc concentrate and zinc-containing secondary material Pending CN111424175A (en)

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Publication number Priority date Publication date Assignee Title
CN111926133A (en) * 2020-10-10 2020-11-13 中国恩菲工程技术有限公司 Method and apparatus for smelting iron-based mineral

Citations (1)

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Publication number Priority date Publication date Assignee Title
CN110129584A (en) * 2019-05-31 2019-08-16 中国恩菲工程技术有限公司 Short route pyrometallurgy of zinc device and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110129584A (en) * 2019-05-31 2019-08-16 中国恩菲工程技术有限公司 Short route pyrometallurgy of zinc device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111926133A (en) * 2020-10-10 2020-11-13 中国恩菲工程技术有限公司 Method and apparatus for smelting iron-based mineral

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