CN107043854B - The synthetical recovery equipment and technique of a variety of non-ferrous metal materials - Google Patents

The synthetical recovery equipment and technique of a variety of non-ferrous metal materials Download PDF

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Publication number
CN107043854B
CN107043854B CN201710041935.8A CN201710041935A CN107043854B CN 107043854 B CN107043854 B CN 107043854B CN 201710041935 A CN201710041935 A CN 201710041935A CN 107043854 B CN107043854 B CN 107043854B
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heat preservation
external crucible
furnace
height
melt
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CN201710041935.8A
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CN107043854A (en
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梁瑞兵
梁超
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梁瑞兵
梁超
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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
    • C22B7/00Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001Dry 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
    • C22B13/025Recovery from waste materials
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00Obtaining copper
    • C22B15/0026Pyrometallurgy
    • C22B15/0028Smelting or converting
    • 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
    • C22B19/20Obtaining zinc otherwise than 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
    • C22B19/00Obtaining zinc or zinc oxide
    • C22B19/30Obtaining zinc or zinc oxide from metallic residues or scraps
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The present invention relates to the synthetical recovery equipment of a variety of non-ferrous metal materials and techniques.Recycling lead, zinc, the reduction furnace of each process of copper, fuming furnace, converter are linked together by the synthetical recovery equipment of a variety of non-ferrous metal materials by keeping the temperature external crucible.Technique of the invention is once to feed intake, continuous output lead bullion, blister copper, zinc oxide.Beneficial effects of the present invention are:Raw material, which is disposably put into, extract each valuable metal, reduces smelting procedure, makes with short production cycle, smelting process easy;Take full advantage of the thermal energy in smelting process, significantly saving heat energy source, reduce energy consumption;Entreprise cost has been saved, Business Economic Benefit has been improved, reduces production cost and reduction enterprise one-time fixes assets investment.

Description

The synthetical recovery equipment and technique of a variety of non-ferrous metal materials
Technical field
The invention belongs to metal smelt fields, and in particular to the synthetical recovery equipment and work of one kind of multiple non-ferrous metal materials Skill.
Background technique
There is pyrogenic process smelting to the process for carrying out regeneration feed smelting containing a variety of non-ferrous metals such as lead, zinc, copper, gold, silver Refining and two kinds of hydrometallurgy, wet method smelting process is not also overripened in the world, under test.Therefore, smelting both domestic and external Method is all made of pyrometallurgical smelting process.
International and domestic at present is all according to the characteristic of each metal using the different smelting type of furnaces, and construction is smelted back at independent Knock off sequence, a procedure recycles a kind of metal.First of oxygen-enriched side-blown reducing furnace smelting procedure recycles lead (copper), hereafter by clinker The poor matte of middle precipitation and separation is sent into lower road matte furnace and is enriched with into rich matte, then rich matte is sent to converting furnace blowing into blister copper. Being sent to rotary kiln recycling zinc oxide after water quenching containing zinc furnace cinder (or slag directly used in not water quenching after oxygen-enriched side-blown reducing furnace recycling lead Packet hangs in blast furnace fuming recycling zinc oxide).This its production cycle of conventional smelting process is long, process route is complicated, repeats It consumes heat energy and investment in fixed assets is huge.
Summary of the invention
In order to solve production cycle of the existing technology it is long, largely consume the energy, process route is complicated the problems such as, this hair The bright synthetical recovery equipment and technique for providing one kind of multiple non-ferrous metal materials, have reduce smelting procedure, reduce energy consumption, The features such as reducing cost.
The technical scheme adopted by the invention is as follows:
Before the synthetical recovery equipment of one kind of multiple non-ferrous metal materials, including reduction furnace, fuming furnace, converter, the first heat preservation Bed and the second heat preservation external crucible, wherein
The reduction furnace offers melt outlet and lead discharging mouth;
First heat preservation external crucible, offers melt inlet, row's copper mouth and overflow outlet, the melt outlet and the melt into Mouth is connected, so that hot melt flows into the first heat preservation external crucible in the reduction furnace;Row's copper mouth and the converter connect It is logical, the matte in the first heat preservation external crucible is released into the converter;
Second heat preservation external crucible, offers overflow inlet and dross outlet, and the overflow inlet is connected with overflow outlet Lead to, so that in the scum overflow in the first heat preservation external crucible to the second heat preservation external crucible;The dross outlet and the fuming furnace Connection drains into dross hot in the second heat preservation external crucible in the fuming furnace.
Further, the height of the melt outlet is higher than the height of the melt inlet, the height of the overflow outlet Higher than the height of row's copper mouth, the height of row's copper mouth is higher than the height of the import of the converter.
Further, the height of the overflow outlet is higher than the height of the overflow inlet, the height of the dross outlet Higher than the height of the import of the fuming furnace.
Further, multiple spray guns are provided in the reduction furnace, multiple spray guns tilt down, and each described Angle between spray gun and horizontal plane is 10~45 °.
Further, the furnace height of the reduction furnace is 4~6 meters.
Further, the top of the first heat preservation external crucible and the second heat preservation external crucible is covered with heat-preserving cover plate.
The comprehensive recycling process of one kind of multiple non-ferrous metal materials, includes the following steps:
(1) coke, a variety of non-ferrous metal materials, flux are successively put into melting in reduction furnace, reduction obtains lead bullion and heat The melt of state;
(2) melt is put into the first heat preservation external crucible, continues to restore the melt, continuous precipitation and separation obtain matte and Dross;
(3) matte is released into converter, the dross constantly overflows in the second heat preservation external crucible;
(4) it keeps the temperature the hot dross accumulated in external crucible for second to be discharged into fuming furnace, the fuming in the fuming furnace Recycle zinc oxide;
(5) in the converter, by the matte smelting at blister copper.
Further, in the first heat preservation external crucible, the temperature of the melt is maintained at 1200~1400 DEG C.
Further, in the second heat preservation external crucible, the temperature of the dross is maintained at 1000~1200 DEG C
Further, in step (1), the content of lead is 0.5~0.8% in the melt.
Beneficial effects of the present invention are:
(1) unique connected furnace design:By be used to recycle lead, zinc, copper each smelting furnace by first heat preservation external crucible and Second heat preservation external crucible connects, and forms the integrated equipment line that can continuously recycle a variety of non-ferrous metals;
(2) energy saving, reduce cost:Each outlet, import be directly connected to and high low setting, previous step reaction product are straight Connect the reaction raw materials as next step, transported without equipment, without the melting that heats up again again after hot material water quenching, save water resource, Saving heat energy;
(3) spray gun tilts down in reduction furnace, and bulk gas directly sprays to the surface of material, increases surface of material pressure, Improve out lead speed;
Heat-preserving cover plate on (4) two heat preservation external crucibles can retain the heat in hot material, prevent from scattering and disappearing;
(5) present invention process realize once feed intake can continuous output lead bullion, blister copper, zinc oxide, reduce smelting procedure, Simplify process route, shorten the production cycle;
(6) thermal energy that hot material itself in smelting process is made full use of in production process, reduces energy consumption, reduce enterprise at This, improves Business Economic Benefit.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is prior art reduction furnace procedure technology process;
Fig. 2 is prior art recycling zinc oxide procedure technology process;
Fig. 3 is prior art concentrated matte procedure technology process;
Fig. 4 is prior art blister copper blowing procedure technology process;
Fig. 5 is process flow chart of the invention;
Fig. 6 is the structural schematic diagram of one embodiment of the present of invention.
1- reduction furnace in figure;2- first keeps the temperature external crucible;3- second keeps the temperature external crucible;4- fuming furnace;5- converter.
Specific embodiment
It is to the smelting process of the nonferrous metal material of leaded, zinc, copper, gold, silver and rare precious metal at present:First use Reduction furnace restores lead bullion (and the gold and silver of enriched and other rare precious metals);Furnace slag granulating is sent at Water Quenching Slag to revolution again Kiln volatilization extracting zinc oxide (or not water quenching directly hangs in blast furnace fuming recycling zinc oxide with cinder ladle);In addition from clinker heavy The poor matte of precipitation and separation is sent into after matte furnace is enriched with into rich matte in shallow lake pot (or precipitating external crucible), then rich matte is sent to blowing Furnace blows into blister copper.The process flow of its each procedure is summarized as follows:
1. reduction furnace procedure technology process is:
As shown in Figure 1, after matching, melting in oxygen-enriched side-blown reducing furnace is added in the material from each feed bin.Lead bullion (enrichment A large amount of gold and silver and rare precious metal) than great, lower layer of reduction furnace internal crucible area is sunk to, lead bullion is released by lead outlet, melt (clinker and ice Copper) on internal crucible area upper layer, clarifying kettle is flowed by top cinder notch.Bottom is deposited in clarifying kettle is matte, and top is clinker.Furnace Slag produces substandard products zinc oxide through water quenching, the road Song Xia rotary kiln evaporation.
2. recycling zinc oxide procedure technology process
As shown in Fig. 2, mix Water Quenching Slag supplying 30-35% coke powder thoroughly laggard rotary kiln, make zinc oxide in material and easily The metal oxide of volatilization first carries out being reduced into metal and flashes to metal vapors, metal vapors kiln body high-temperature space by oxygen Change, zinc re-oxidation is at zinc oxide (substandard products zinc oxide), and cloth pocket is gathered dust after air-introduced machine sucking surface-cooler is cooling, is received The flue dust of collection is exactly substandard products zinc oxide.Emptying after tail gas send desulfurizing tower tail gas absorption sulphur removal up to standard.
3. concentrated matte procedure technology process
As shown in figure 3, from the poor matte of clarifying kettle (or external crucible) separation output since deposition efficiency is poor after reduction furnace melting Separating effect is bad, therefore cupric is low, more (generally containing Pb2-5%, Cu1-3%) containing clinker, it is necessary to after secondary enrichment could incite somebody to action Rich the blowing refinement of the matte is summarized as follows at blister copper, concentrated matte process:
It will be added in matte reduction furnace after the coke and a certain proportion of flux of poor matte supplying 13-15%, through high temperature melting After refining, rich matte (capturing whole gold and silver and rare precious metal in rich matte) is sent from the matte mouth of matte reduction furnace outflow ingot casting blows Furnace blowing is washed into Water Quenching Slag, the ash-laden gas of matte reduction furnace output cooling, cloth through cooler from cinder notch discharge at blister copper, clinker After pocket is gathered dust, flue gas empties after sending desulfurizing tower desulfurization;Flue dust uses after returning to oxygen-enriched side-blown reducing furnace ingredient.
The procedure technology process 4. blister copper blows
As shown in figure 4, rich matte blows through being sent into converter, converting process heavy oil makees fuel, and it is molten that quartz sand is added Agent slag making, the additional amount of quartz sand flux is depending on matte ingredient and converter slag ingredient.Converting process is by the blowing refinement of the matte at blister copper (capturing whole gold and silver and rare precious metal in blister copper), iron enters clinker after being oxidized, and sulphur enters flue gas with sulfur dioxide.
Applicant's prior art processes there are many defects:
(1) process is more, complex process for construction:From raw material into factory to a whole valuable metals are extract, to build 4 big Process, take up a large area, invest that big, the construction period is long, complex process;
(2) heat utilization efficiency is low, energy consumption is high:From the slag and matte that oxygen-enriched side-blown reducing furnace comes out after water quenching and condensation, It repeats to melt into the smelting furnace of next procedure again, had both had lost preceding working procedure heat, and consumed energy melting again again, make that energy consumption is high Amplitude increases;
(3) entreprise cost is high, economic benefit is low:(I) since process is more, construction investment scale increases, and maintenance cost is big; (II) since process is more, recruitment is more, and recruitment cost increases;(III) since each procedure repeats to smelt fusing, energy consumption is significantly It increases, it is at high cost.
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work Other embodiment belongs to the range that the present invention is protected.
As shown in fig. 6, the connection type of process equipment:
Lead-zinc response line:The melt outlet of reduction furnace 1 is connected with the first heat preservation 2 melt inlet of external crucible, is restored Furnace 1 is linked into one with the first heat preservation external crucible 2;The overflow of the overflow inlet of second heat preservation external crucible 3 and the first heat preservation external crucible 2 exports It is connected, so that the second heat preservation external crucible 3 is kept the temperature external crucible 2 with first and be linked into one;The dross mouth and fuming furnace of second heat preservation external crucible 3 4 feed inlet connection.
Lead-copper response line:First heat preservation external crucible 2 row copper mouth and converter 5 feed inlet connection, first heat preservation external crucible 2 and Converter 5 is linked into one.
The setting of each outlet and import, it then follows outlet height is higher than the principle of corresponding inlet height, specially:It is described The height of slag outlet is higher than the height of the clinker import, and the height of the overflow outlet is higher than the height of row's copper mouth, The height of row's copper mouth is higher than the height of the import of the converter;The height of the overflow outlet is higher than the overflow inlet Highly, the height of the dross outlet is higher than the height of the import of the fuming furnace.
Reduction furnace, converter, fuming furnace are up to several meters of large-scale smelting equipment, how to design and accomplish that outlet is higher than import Not a duck soup.An embodiment of the invention is:It, will by reduction furnace, two heat preservation external crucible designs in the same basic platform In configuration platform, the height of basic platform is higher than the height of configuration platform for fuming furnace, Converter Design, according to reduction furnace, fireworks furnace, The capacity of converter is designed to different differences in height.In order to feed intake into reduction furnace, it is also devised with proportioning platform, by reduction furnace original Expect library, ingredient, briquetting, charging scffold and desulfurizing tower and part facilty design on this proportioning platform.
Landform is sorted out to the plane of three steps from top to bottom, most on be the 1st plane, be oxygen-enriched side-blown reducing furnace Raw material storage, ingredient, briquetting, charging scffold and desulfurizing tower and part assist the plane of installations and facilities;The 2nd plane from top to bottom Drop is 7.5 meters, is the basic plane of oxygen-enriched side-blown reducing furnace, two heat preservation external crucibles;From the 2nd plane to the 3rd minimum plane Drop is 6.5 meters, for fuming furnace, blows copper basis converter and the configuration plane of other facilities.
It should be pointed out that height signified in the present invention is the acquisition compared with same level.
Enter First together from the melt (matte of dross and lower layer including upper layer) of reduction furnace reduction fusing to keep the temperature Precipitation and separation after external crucible stores in scum overflow to second heat preservation external crucible, will after meeting the quantity of slag required for each furnace fuming Liquid dross is put into blast furnace fuming recycling zinc oxide.The matte precipitated in First heat preservation external crucible flows into after filling through matte mouth Bessemerize into blister copper.
As shown in figure 5, specific process flow is described below:
(I) briquetting
Outsourcing is leaded, zinc, copper and rare precious metal waste material or low-grade nonferrous metals ore and various returning charges (such as the two of collection Secondary flue dust) etc. mixed with lead mud after, put into briquetting in briquetting machine, moisture control is 10%, briquetting lumpiness 50mm~200mm.
(II) is dry
Briquetting material moisture content is higher, and bad mechanical strength, the poor air permeability of furnace charge in oxygen-enriched side-blown reducing furnace melting, The reduction for influencing metal, must be dried it before entering furnace, and the block group after briquetting spontaneously dries 3~4 using briquetting storehouse It, moisture content H at this time2O≤3%, mechanical strength can reach 500 pressure, after measured, in agglomerate lead content be 16~20%, Iron content 18~23%, silicone content 7~8%, calcium content 5% or so.Material is submitted by charge hoisting bucket to reduction furnace after drying Loading hopper.
The furnace melting of (III) oxygen-enriched side-blown reducing
Melting in reduction furnace, the charging sequence of oxygen-enriched side-blown reducing furnace melting is added in material from each feed bin after matching For coke, ingredient mass, flux.The furnace height for designing reduction furnace is 4~6 meters, and multiple sprays are provided in the reduction furnace Rifle, multiple spray guns tilt down, and the angle between each spray gun and horizontal plane is 10~45 °.
In fusion process, lead bullion (enriched gold and silver and rare precious metal) sinks to the most lower of reduction furnace internal crucible area than great Layer, melt (including dross and matte) is on internal crucible area upper layer.Lead bullion is released by lead discharging mouth, is cooled and shaped in moulds in casting wheel, Lead bullion can direct marketing factory after molding.
The spray gun tilted down in reduction furnace is capable of increasing the pressure of surface of material, improves out lead rate;Meanwhile increasing Burner hearth can effectively prevent lead volatility to be oxidized to lead oxide, and enter melt layer.Through detecting, contain in the melt of melting of the present invention Lead amount is 0.5%~0.8%, and lead content is 1.5~2% in melt in the prior art.
(IV) first heat preservation external crucible precipitating shunts
Melt (matte and dross) flows into the first heat preservation external crucible by the melt outlet of reduction furnace.Matte is deposited in the first external crucible Bottom, clinker float on matte.The top of the first heat preservation external crucible is covered with heat-preserving cover plate, and the first heat preservation external crucible is outer Wall, which is equipped with, thickeies heat preservation brick wall.Temperature of the melt in the first heat preservation external crucible is maintained at 1200~1400 DEG C, therefore, can be realized Further to restore, the copper in dross is constantly precipitate into the matte layer of bottom.The matte taste for being detected the first external crucible is reachable 20% or so, significantly larger than in the prior art 5% or so matte taste.When matte is filled, the first heat preservation external crucible is opened Pai Tongkou, matte is put into blow copper converter blown (converting process is shown in aforementioned) at blister copper sell dispatch from the factory.
The dross on upper layer constantly overflows to the second heat preservation external crucible by overflow outlet, and the top of the second heat preservation external crucible is equal Be covered with heat-preserving cover plate, and the outer wall of the second heat preservation external crucible is equipped with and thickeies heat preservation brick wall, can keep the temperature of dross 1000~ 1200℃.After dross is filled in second heat preservation external crucible, it is discharged into fuming furnace by the dross outlet of the second heat preservation external crucible bottom. It is sprayed into after a small amount of fine coal makes zinc reduction evaporation to fuming furnace, through flue gas is cooling and cloth pocket gathers dust to obtain time after being oxidized again The sale factory of product zinc oxide product.
Matte into converter and the dross into fuming furnace are the very high hot material of temperature, rather than after water quenching Therefore cold slag can greatly reduce energy consumption when smelting again.
The tail gas that oxygen-enriched side-blown reducing furnace, fuming furnace, converter generate send double alkali method desulfurizing tower to purify with air-introduced machine, after up to standard Emptying.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (2)

1. the synthetical recovery equipment of one kind of multiple non-ferrous metal materials, it is characterised in that:Including reduction furnace, fuming furnace, converter, One heat preservation external crucible and the second heat preservation external crucible, wherein
The reduction furnace offers melt outlet and lead discharging mouth;
First heat preservation external crucible offers melt inlet, row's copper mouth and overflow outlet, the melt outlet and the melt inlet phase Connection, so that hot melt flows into the first heat preservation external crucible in the reduction furnace;Row's copper mouth is connected to the converter, with Matte in the first heat preservation external crucible is released into the converter;
Second heat preservation external crucible, offers overflow inlet and dross outlet, and the overflow inlet is connected with overflow outlet, with Make in the scum overflow to the second heat preservation external crucible in the first heat preservation external crucible;The dross outlet is connected to the fuming furnace, To drain into dross hot in the second heat preservation external crucible in the fuming furnace, the height of slag outlet is higher than clinker import Highly, the height of overflow outlet is higher than the height of row's copper mouth, the height of row's copper mouth be higher than the converter into The height of mouth, the height of the overflow outlet are higher than the height of overflow inlet, and the height of the dross outlet is higher than the fuming The height of the import of furnace is provided with multiple spray guns in the reduction furnace, and multiple spray guns tilt down, and each spray Angle between rifle and horizontal plane is 10~45 °, and the furnace height of the reduction furnace is 4~6 meters, the first heat preservation external crucible and The top of the second heat preservation external crucible is covered with heat-preserving cover plate.
2. technique used in a kind of synthetical recovery equipment of a variety of non-ferrous metal materials as described in claim 1, it is characterised in that: Include the following steps:
(1) coke, a variety of non-ferrous metal materials, flux are successively put into melting in reduction furnace, reduction obtains lead bullion and hot Melt;
(2) melt is put into the first heat preservation external crucible, continues to restore the melt, continuous precipitation and separation obtains matte and floats Slag;
(3) matte is released into converter, the dross constantly overflows in the second heat preservation external crucible;
(4) it keeps the temperature the hot dross accumulated in external crucible for second to be discharged into fuming furnace, fuming is recycled in the fuming furnace Zinc oxide;
(5) in the converter, by the matte smelting at blister copper,
In the first heat preservation external crucible, the temperature of the melt is maintained at 1200~1400 DEG C,
In step (1), the content of lead is 0.5~0.8% in the melt.
CN201710041935.8A 2017-01-20 2017-01-20 The synthetical recovery equipment and technique of a variety of non-ferrous metal materials Expired - Fee Related CN107043854B (en)

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JP3865496B2 (en) * 1998-03-19 2007-01-10 三井金属鉱業株式会社 Slag reforming method
CN101514399B (en) * 2009-04-03 2010-12-29 湖南宇腾有色金属股份有限公司 Balancing lead smelting process for comprehensive resource utilization and device thereof
CN101705368B (en) * 2009-12-07 2011-02-09 河南豫光金铅股份有限公司 Process and device for treating decopperized slag by adopting bottom-blowing molten pool to produce wet lead and raw copper
CN101768670B (en) * 2010-02-25 2011-05-04 北京矿冶研究总院 Method for smelting lead-containing material
CN102312103A (en) * 2011-09-16 2012-01-11 北京矿冶研究总院 Direct reduction melting method of molten liquid lead contained slag
CN103993176B (en) * 2014-05-13 2016-04-13 中国恩菲工程技术有限公司 Oxygen-enriched top blowing melting-liquid high lead dross side-blown direct-reduction refining splicer skill

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