CN106319232A - Method and system for processing zinc volatilization kiln slag - Google Patents
Method and system for processing zinc volatilization kiln slag Download PDFInfo
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- CN106319232A CN106319232A CN201610684967.5A CN201610684967A CN106319232A CN 106319232 A CN106319232 A CN 106319232A CN 201610684967 A CN201610684967 A CN 201610684967A CN 106319232 A CN106319232 A CN 106319232A
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- kiln slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working 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
- C22B7/04—Working-up slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working 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
- C22B7/001—Dry processes
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a method and system for processing zinc volatilization kiln slag. The method includes the steps that firstly, the zinc volatilization kiln slag is subjected to crushing treatment, so that kiln slag crushed materials can be obtained; secondly, the kiln slag crushed materials are subjected to drying treatment, so that crushed and dried materials can be obtained; thirdly, the crushed and dried materials are subjected to pelletizing, so that pellets can be obtained; and fourthly, the pellets, silica and calcium-series additives are supplied into a fuel gas melt separation furnace, so that smoke dust containing lead and zinc, molten iron and melt separation slag can be obtained. By means of the method, comprehensive recovery of iron, lead, zinc, silver and indium in the zinc volatilization kiln slag can be achieved, the iron recovery rate is higher than 92%, the lead recovery rate is higher than 96%, the zinc recovery rate is higher than 98%, the silver recovery rate is higher than 85%, and the indium recovery rate is higher than 85%.
Description
Technical field
The invention belongs to metallurgical technology field, specifically, the present invention relates to a kind of method processing Zinc volatilization kiln slag and
System.
Background technology
Rotary kiln evaporation method is one of the most widely used method processing zinc leaching residue, and this method uses dried leaching
The coke powder allocated in slag, joins in rotary kiln and processes, and furnace gas temperature general control 1000～1300 degrees Celsius in kiln, in revolution
In kiln volatilization process, processed material mixes with reducing agent, is sometimes additionally added a small amount of Calx and promotes the decomposition of zinc sulfide also
The composition of regulation kiln slag.Metal-oxide in leached mud contacts with coke powder, and the metallic vapour being reduced out enters gas phase, at gas
Oxide it is oxidized to again in mutually.Flue dust imports dust collecting system after cooling, makes lead, zinc oxide be recycled.Rotary kiln is waved
The volatility of the method for sending out is up to 90～95%, and in leached mud, ferrum and the impurity of more than 90% enter kiln slag.
Zinc volatilization kiln slag is a kind of precious resources, but its comprehensive reutilization is a worldwide technological puzzle.Always with
Coming, Zinc volatilization kiln slag is mainly used in laying road surface, making cement filler, and major part does not obtains reasonable employment, is stacked on the whole nation each
Ge Ye zine-smelting plant, had both taken tract resource, easily caused again environmental pollution, wasted social resources.Ferrum in Zinc volatilization kiln slag
Relatively big Deng the recovery difficult of valuable metal, multiple technologies process route is feasible, but economy is poor.
Therefore, the technology of existing process Zinc volatilization kiln slag is further improved.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the present invention
One purpose is to propose a kind of method and system processing Zinc volatilization kiln slag, the method can realize ferrum in Zinc volatilization kiln slag,
The synthetical recovery of lead, zinc, silver and indium, and the response rate of ferrum is more than 92%, and the response rate of lead is more than 96%, and the response rate of zinc is big
In 98%, the response rate of silver is more than 85%, and the response rate of indium is more than 85%.
In one aspect of the invention, the present invention proposes a kind of method processing Zinc volatilization kiln slag.According to the present invention's
Embodiment, the method includes:
(1) Zinc volatilization kiln slag is carried out break process, in order to obtain kiln slag broken material；
(2) described kiln slag broken material is carried out drying and processing, in order to obtain crushing drying material；
(3) described crushing drying material is carried out pelletizing, in order to obtain pelletizing；
(4) by described pelletizing and Silicon stone and the additive supply of calcium system to molten point of stove of combustion gas, in order to obtain containing Pb-Zn dust,
Molten iron and melting slag.
Thus, the method processing Zinc volatilization kiln slag according to embodiments of the present invention is by by Zinc volatilization kiln slag crushing drying material
Reduction reaction is carried out to the molten point stove of combustion gas so that the zinc-silver lead indium chemical combination in Zinc volatilization kiln slag with Silicon stone and the additive supply of calcium system
Thing is recovered so that the form of oxide, sulfide enters flue dust, and the ferrum in kiln slag is reduced further into molten iron by excess carbon,
Carbon residue in Zinc volatilization kiln slag is used as the reducing agent of reduction process simultaneously, and by by after broken for Zinc volatilization kiln slag again
Carry out pelletizing, carbon residue and the contact area of metallic compound in Zinc volatilization kiln slag can be significantly improved, thus be reduced in reduction
Reduction efficiency is improved, it addition, by adding Silicon stone and calcium system additive, adjust liquation basicity, it is ensured that the stream of liquation while Ben
The diffusion of dynamic property, beneficially ferrum and gathering, such that it is able to improve the response rate of ferrum.Thus, employing the present processes can be real
Ferrum, lead, zinc, silver and the synthetical recovery of indium in existing Zinc volatilization kiln slag, and the response rate of ferrum is more than 92%, and the response rate of lead is more than
96%, the response rate of zinc is more than 98%, and the response rate of silver is more than 85%, and the response rate of indium is more than 85%.
It addition, the method for process Zinc volatilization kiln slag slag according to the above embodiment of the present invention can also have following additional
Technical characteristic:
In some embodiments of the invention, in step (1), the particle diameter of described kiln slag broken material is not higher than 3mm.By
This, it is possible to reduce the loss of carbon in kiln slag, and then significantly improve the response rate of ferrum, lead, zinc, silver and indium.
In some embodiments of the invention, in step (2), the water content of described crushing drying material is not higher than
0.5wt%.Thus, it is possible to improve the response rate of ferrum, lead, zinc, silver and indium further.
In some embodiments of the invention, step (4) is carried out according to the following step: (4-1) is by described pelletizing
Part supply carries out making molten bath to molten point of stove of described combustion gas；(4-2) by another part of described pelletizing, described Silicon stone and institute
State the additive supply of calcium system and carry out reduction reaction to described molten bath, in order to obtain containing Pb-Zn dust, molten iron and melting slag.By
This, can improve the response rate of ferrum, lead, zinc, silver and indium further.
In some embodiments of the invention, in step (4-1), by molten for described combustion gas point of furnace temperature 1550～1600
It is incubated 20～40 minutes, preferably insulation 30 minutes under degree Celsius.Thus, it is possible to improve returning of ferrum, lead, zinc, silver and indium further
Yield.
In some embodiments of the invention, in step (4-2), described reduction reaction is at 1550～1600 degrees Celsius
Under carry out 1～2.5 hour.Thus, it is possible to improve the response rate of ferrum, lead, zinc, silver and indium further.
In some embodiments of the invention, in step (4-2), the basicity of described melting slag is 1.1～1.4.Thus,
The mobility of melting slag can be improved, thus improve the response rate of ferrum further.
In some embodiments of the invention, the method for described process Zinc volatilization kiln slag farther includes: (5) contain described
Pb-Zn dust carries out waste heat recovery, in order to obtain flue dust of lowering the temperature；(6) described cooling flue dust is carried out cooling process, in order to cooling
Flue dust；(7) described cooling flue dust is carried out bag collection, in order to collect dust.
In another aspect of the invention, what the present invention proposed a kind of method implementing above-mentioned process Zinc volatilization kiln slag is
System.According to embodiments of the invention, this system includes:
Breaker, described breaker has Zinc volatilization kiln slag entrance and the outlet of kiln slag broken material；
Drying unit, described drying unit has kiln slag broken material entrance and the outlet of crushing drying material, and described kiln slag crushes
Material entrance is connected with the outlet of described kiln slag broken material；
Palletizing device, described palletizing device has crushing drying material entrance and pelletizing outlet, described crushing drying material entrance
It is connected with the outlet of described crushing drying material；
Molten point of stove of combustion gas, the molten point stove of described combustion gas has the outlet of pelletizing entrance, flue dust, molten iron outlet and melting slag outlet,
Described pelletizing entrance is connected with the outlet of described pelletizing.
Thus, the method processing Zinc volatilization kiln slag according to embodiments of the present invention is by by Zinc volatilization kiln slag crushing drying material
Reduction reaction is carried out to the molten point stove of combustion gas so that the zinc-silver lead indium chemical combination in Zinc volatilization kiln slag with Silicon stone and the additive supply of calcium system
Thing is recovered so that the form of oxide, sulfide enters flue dust, and the ferrum in kiln slag is reduced further into molten iron by excess carbon,
Carbon residue in Zinc volatilization kiln slag is used as the reducing agent of reduction process simultaneously, and by by after broken for Zinc volatilization kiln slag again
Carry out pelletizing, carbon residue and the contact area of metallic compound in Zinc volatilization kiln slag can be significantly improved, thus be reduced in reduction
Reduction efficiency is improved, it addition, by adding Silicon stone and calcium system additive, adjust liquation basicity, it is ensured that the stream of liquation while Ben
Dynamic property, such that it is able to significantly improve the response rate of ferrum.Thus, use the present processes can realize ferrum in Zinc volatilization kiln slag,
The synthetical recovery of lead, zinc, silver and indium, and the response rate of ferrum is more than 92%, and the response rate of lead is more than 96%, and the response rate of zinc is big
In 98%, the response rate of silver is more than 85%, and the response rate of indium is more than 85%.
In some embodiments of the invention, the system of described process Zinc volatilization kiln slag farther includes: waste heat recovery fills
Putting, described waste-heat recovery device has flue dust entrance and cooling flue dust outlet, and described flue dust entrance is connected with the outlet of described flue dust；
Chiller, described chiller has cooling flue dust entrance and cooling flue dust outlet, described cooling flue dust entrance and described fall
Temperature flue dust outlet is connected；Bagroom, described bagroom has cooling flue dust entrance, dust outlet and gas outlet,
Described cooling flue dust entrance is connected with the outlet of described cooling flue dust.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram processing Zinc volatilization kiln slag according to an embodiment of the invention；
Fig. 2 is the method flow schematic diagram processing Zinc volatilization kiln slag according to further embodiment of the present invention；
Fig. 3 is the system structure schematic diagram processing Zinc volatilization kiln slag according to an embodiment of the invention；
Fig. 4 is the system structure schematic diagram processing Zinc volatilization kiln slag according to further embodiment of the present invention.
Detailed description of the invention
Embodiments of the invention are described below in detail.The embodiments described below is exemplary, is only used for explaining this
Bright, and be not considered as limiting the invention.Unreceipted concrete technology or condition in embodiment, according to the literary composition in this area
Offer described technology or condition or carry out according to product description.Agents useful for same or instrument unreceipted production firm person, all
For can by city available from conventional products.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In one aspect of the invention, the present invention proposes a kind of method processing Zinc volatilization kiln slag.According to the present invention's
Embodiment, with reference to Fig. 1 and 2, the method includes:
S100: Zinc volatilization kiln slag is carried out break process
In this step, Zinc volatilization kiln slag is carried out break process, in order to obtain kiln slag broken material.Inventor finds, logical
Cross control Zinc volatilization kiln slag and crush particle diameter, it is possible to reduce the loss of carbon in kiln slag, and then significantly improve ferrum, lead, zinc, silver and indium
The response rate.Concrete, Zinc volatilization kiln slag is the solid slag that zinc leaching residue obtains after reduction Water Quenching, and wherein silver content is
(100～150) g/t, and contain the zinc of the ferrum of carbon, 20～40wt%, 1～5wt%, 0.8～the 3.0wt% of 30～40wt%
Other valuable metals such as lead and indium, have and recycle value greatly.
According to one embodiment of present invention, the particle diameter of kiln slag broken material is not particularly restricted, those skilled in the art
Can select according to actual needs, according to a specific embodiment of the present invention, the particle diameter of kiln slag broken material is not higher than
3mm.Inventors be surprised to learn that, Zinc volatilization kiln slag is crushed to this particle diameter can substantially reduce in kiln slag during sequential reduction
The loss of carbon, and then significantly improve the response rate of ferrum, lead, zinc, silver and indium.
S200: kiln slag broken material is carried out drying and processing
In this step, kiln slag broken material is carried out drying and processing, in order to obtain crushing drying material.Concrete, gained breaks
The broken water content drying material is not higher than 0.5wt%, and inventor finds, can be further to this water content by the drying of kiln slag broken material
Improve ferrum, lead, zinc, silver and the response rate of indium.
S300: crushing drying material is carried out pelletizing
In this step, crushing drying material is carried out pelletizing, in order to obtain pelletizing.Concrete, can be by crushing drying material
Pelletizing is carried out in disc balling machine.It should be noted that those skilled in the art can tool to pelletizing according to actual needs
Body particle diameter selects.
S400: pelletizing is divided in stove to combustion gas is molten with Silicon stone and the additive supply of calcium system
In this step, according to embodiments of the invention, pelletizing is divided to combustion gas is molten with Silicon stone and the additive supply of calcium system
In stove, in order to obtain containing Pb-Zn dust, molten iron and melting slag.Inventor finds, calcium system additive and Silicon stone can adjust liquation
Basicity, it is ensured that the diffusion of liquation mobility, beneficially ferrum and gathering, such that it is able to improve the response rate of ferrum.Concrete, calcium system adds
Adding agent can be at least one in calcium oxide and calcium carbonate.
According to a particular embodiment of the invention, step S400 is carried out according to the following step: (4-1) is by described pelletizing
Part supply carries out making molten bath to molten point of stove of described combustion gas；(4-2) by another part of described pelletizing, described Silicon stone and institute
State the additive supply of calcium system and carry out reduction reaction to described molten bath, in order to obtain containing Pb-Zn dust, molten iron and melting slag.Specifically
, first the part supply of pelletizing being carried out making molten bath to molten point of stove of combustion gas, pelletizing fusing in molten point of stove of combustion gas is formed
Liquid state molten pool, when bath surface reach combustion gas melt point stove furnace height three/for the moment, another part of pelletizing is supplied extremely
Molten point of stove of combustion gas, makes bath surface reach combustion gas and melts 3/5ths of point stove furnace height, and then by Silicon stone and calcium system additive
Supplying and carry out reduction reaction to the molten point stove of combustion gas, valuable metal lead, zinc and silver in kiln slag are with sulfide, oxide and sulfate
Presented in, under the high temperature conditions, sulphate decomposition is oxide and sulfur dioxide, and valuable metal is vulcanized by the carbon in kiln slag
Thing and oxide are reduced to simple substance, so metallic element to be volatized into flue by secondary oxidation be that oxide is received by dust arrester installation
Collection, further, the iron oxides in molten bath is reduced by excess carbon in kiln slag deeply, and ferrum element is converted into molten iron, it is achieved slag ferrum
Separate.Thus, it is possible to realize the synthetical recovery of ferrum, lead, zinc, silver and indium in Zinc volatilization kiln slag, after testing, the response rate of ferrum is more than
92%, the response rate of lead is more than 96%, and the response rate of zinc is more than 98%, and the response rate of silver is more than 85%, and the response rate of indium is more than
85%.
According to one embodiment of present invention, in step (4-1), the temperature of point stove is melted in combustion gas and temperature retention time is not subject to
Limiting especially, those skilled in the art can select according to actual needs, according to a specific embodiment of the present invention, combustion
Gas melts the temperature of point stove and can be 1550～1600 degrees Celsius and be incubated 20～40 minutes, preferably 30 minutes.
According to still a further embodiment, in step (4-2), the temperature and time of reduction reaction is not by especially
Limiting, those skilled in the art can select according to actual needs, and according to a specific embodiment of the present invention, reduction is anti-
Should carry out under 1500～1600 degrees Celsius 1.25 hours.Inventor by experiment it was unexpectedly observed that the temperature of reduction reaction
Spend the lowest, liquation poor fluidity, be unfavorable for reduction and the diffusion of ferrum, and if reduction reaction temperature is the highest, energy-output ratio is big, warp
Ji cost is poor；And temperature retention time is the shortest, slag ferrum can not sufficiently separate, and the time is oversize, and production efficiency can be made to reduce, and energy consumption
Strengthen.
According to still another embodiment of the invention, the basicity of molten bath inner melt is not particularly restricted, people in the art
Member can select according to actual needs, and according to a specific embodiment of the present invention, the basicity of molten bath inner melt can be
1.1～1.4.Inventor it was unexpectedly observed that the basicity of liquation is the highest by experiment, can be made liquation viscosity increase, and then make liquation
Mobility be deteriorated, affect reduction and the gathering of ferrum.
Thus, the method processing Zinc volatilization kiln slag according to embodiments of the present invention is by by Zinc volatilization kiln slag crushing drying material
Reduction reaction is carried out to the molten point stove of combustion gas so that the zinc-silver lead indium chemical combination in Zinc volatilization kiln slag with Silicon stone and the additive supply of calcium system
Thing is recovered so that the form of oxide, sulfide enters flue dust, and the ferrum in kiln slag is reduced further into molten iron by excess carbon,
Carbon residue in Zinc volatilization kiln slag is used as the reducing agent of reduction process simultaneously, and by by after broken for Zinc volatilization kiln slag again
Carry out pelletizing, carbon residue and the contact area of metallic compound in Zinc volatilization kiln slag can be significantly improved, thus be reduced in reduction
Reduction efficiency is improved, it addition, by adding Silicon stone and calcium system additive, the flowing of melting slag can be significantly improved while Ben
Property, such that it is able to significantly improve the response rate of ferrum.Thus, use the present processes can realize ferrum in Zinc volatilization kiln slag, lead,
The synthetical recovery of zinc, silver and indium, and the response rate of ferrum is more than 92%, and the response rate of lead is more than 96%, and the response rate of zinc is more than
98%, the response rate of silver is more than 85%, and the response rate of indium is more than 85%.
With reference to Fig. 2, the method processing Zinc volatilization kiln slag according to embodiments of the present invention farther includes:
S500: Pb-Zn dust will be contained and carry out waste heat recovery
In this step, according to embodiments of the invention, obtain S400 carrying out waste heat recovery containing Pb-Zn dust, dropped
Temperature flue dust.Thus, by obtained is carried out waste heat recovery containing Pb-Zn dust, can be used for generating electricity by this part of waste heat, and
And the temperature of cooling flue dust is down to 400 degrees centigrade, thus realize maximally utilizing of resource.
S600: cooling flue dust is carried out cooling process
According to embodiments of the invention, cooling flue dust obtained above is carried out cooling process, can be cooled flue dust.
Concrete, cooling flue dust temperature after surface-cooler obtained above is down to 250 degrees centigrade.
S700: cooling flue dust is carried out bag collection
According to embodiments of the invention, cooling flue dust obtained above is carried out bag collection, such that it is able to collect dust.
As it has been described above, the method processing Zinc volatilization kiln slag according to embodiments of the present invention can have selected from following advantages extremely
One of few:
The method processing Zinc volatilization kiln slag according to embodiments of the present invention processes Zinc volatilization kiln by utilizing molten point of stove of combustion gas
Slag, can significantly reduce process energy consumption.
The method processing Zinc volatilization kiln slag according to embodiments of the present invention may be implemented in the volatilization of noble metal under hot conditions
Rate is not less than 95%.
The method processing Zinc volatilization kiln slag according to embodiments of the present invention can realize utilizing the carbon residue pair in Zinc volatilization kiln slag
Iron oxides in molten bath carries out drastic reduction, thus significantly reduces processing cost.
In another aspect of the invention, what the present invention proposed a kind of method implementing above-mentioned process Zinc volatilization kiln slag is
System.According to embodiments of the invention, with reference to Fig. 3 and Fig. 4, this system includes: breaker 100, drying unit 200, pelletizing fill
Put 300 and molten point of stove 400 of combustion gas.
According to embodiments of the invention, breaker 100 has Zinc volatilization kiln slag entrance 101 and the outlet of kiln slag broken material
102, and be suitable to Zinc volatilization kiln slag is carried out break process, in order to obtain kiln slag broken material.Concrete, Zinc volatilization kiln slag is zinc leaching
Slagging tap the solid slag that obtains after reduction Water Quenching, wherein silver content be (100～150) g/t, and contains 30～40wt%
The lead of the zinc of the ferrum of carbon, 20～40wt%, 1～5wt%, 0.8～3.0wt% and other valuable metals such as indium, have greatly
Recycling be worth.Inventor finds, is crushed to particle diameter by controlling Zinc volatilization kiln slag, it is possible to reduce the damage of carbon in kiln slag
Lose, and then significantly improve the response rate of ferrum, lead, zinc, silver and indium.
According to one embodiment of present invention, the particle diameter of kiln slag broken material is not particularly restricted, those skilled in the art
Can select according to actual needs, according to a specific embodiment of the present invention, the particle diameter of kiln slag broken material is not higher than
3mm.Inventors be surprised to learn that, Zinc volatilization kiln slag is crushed to this particle diameter can substantially reduce in kiln slag during sequential reduction
The loss of carbon, and then significantly improve the response rate of ferrum, lead, zinc, silver and indium.
According to embodiments of the invention, drying unit 200 has kiln slag broken material entrance 201 and the outlet of crushing drying material
202, kiln slag broken material entrance 201 and kiln slag broken material outlet 102 is connected, and is suitable to kiln slag broken material and carries out drying and processing, with
Just crushing drying material is obtained.Concrete, the water content of gained crushing drying material is not higher than 0.5wt%, and inventor finds, by kiln slag
Broken material drying can improve the response rate of ferrum, lead, zinc, silver and indium further to this water content.
According to embodiments of the invention, palletizing device 300 has crushing drying material entrance 301 and pelletizing outlet 302, broken
Dry material entrance 301 to be connected with crushing drying material outlet 202, and be suitable to crushing drying material is carried out pelletizing, in order to obtain pelletizing.
Concrete, crushing drying material can be carried out in disc balling machine pelletizing.
According to embodiments of the invention, the molten point stove 400 of combustion gas has pelletizing entrance 401, flue dust outlet 402, molten iron outlet
403 and melting slag outlet 404, pelletizing entrance 401 and pelletizing outlet 302 is connected, and is suitable to pelletizing and Silicon stone and the interpolation of calcium system
Agent supply divides in stove to combustion gas is molten, in order to obtain containing Pb-Zn dust, molten iron and melting slag.Concrete, first by the one of pelletizing
Dividing supply to carry out making molten bath to molten point of stove of combustion gas, pelletizing melts in combustion gas and divides fusing in stove to form liquid state molten pool, works as bath surface
Reach combustion gas melt point stove furnace height three/for the moment, another part of pelletizing is supplied to molten point of stove of combustion gas, makes molten bath liquid
Face reaches combustion gas and melts 3/5ths of point stove furnace height, and then Silicon stone and the additive supply of calcium system is carried out to the molten point stove of combustion gas
Reduction reaction, valuable metal lead, zinc and silver in kiln slag are presented in sulfide, oxide and sulfate, at high temperature bar
Under part, sulphate decomposition is oxide and sulfur dioxide, and valuable metal sulfide and oxide are reduced to list by the carbon in kiln slag
Matter, so metallic element to be volatized into flue by secondary oxidation be that oxide is collected by dust arrester installation, further, in kiln slag
Iron oxides in molten bath is reduced by excess carbon deeply, and ferrum element is converted into molten iron, it is achieved slag sluicing system.Thus, it is possible to realize zinc
Ferrum, lead, zinc, silver and the synthetical recovery of indium in volatilization kiln slag, after testing, the response rate of ferrum is more than 92%, and the response rate of lead is more than
96%, the response rate of zinc is more than 98%, and the response rate of silver is more than 85%, and the response rate of indium is more than 85%.
According to one embodiment of present invention, the temperature of point stove is melted in combustion gas and temperature retention time is not particularly restricted, ability
Field technique personnel can select according to actual needs, and according to a specific embodiment of the present invention, the temperature of point stove is melted in combustion gas
Degree can be 1550～1600 degrees Celsius and be incubated 20～40 minutes, preferably 30 minutes.
According to still a further embodiment, the temperature and time of reduction reaction is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to a specific embodiment of the present invention, reduction reaction can be 1500
～carry out under 1600 degrees Celsius 1.25 hours.Inventor passes through to test it was unexpectedly observed that the temperature of reduction reaction is the lowest, liquation stream
Dynamic property is poor, is unfavorable for reduction and the diffusion of ferrum, and if reduction reaction temperature is the highest, greatly, Financial cost is poor for energy-output ratio；And protect
The temperature time is the shortest, and slag ferrum can not sufficiently separate, and the time is oversize, and production efficiency can be made to reduce, and energy consumption strengthens.
According to still another embodiment of the invention, the basicity of molten bath inner melt is not particularly restricted, people in the art
Member can select according to actual needs, and according to a specific embodiment of the present invention, the basicity of molten bath inner melt can be
1.1～1.4.Inventor it was unexpectedly observed that the basicity of liquation is the highest by experiment, can be made liquation viscosity increase, and then make liquation
Mobility be deteriorated, affect reduction and the gathering of ferrum.
The system processing Zinc volatilization kiln slag according to embodiments of the present invention is by by Zinc volatilization kiln slag crushing drying material and silicon
Stone and the supply of calcium system additive carry out reduction reaction to the molten point stove of combustion gas so that the zinc-silver lead indium compound in Zinc volatilization kiln slag with
Oxide, the form of sulfide enter flue dust and are recovered, and the ferrum in kiln slag is reduced further into molten iron by excess carbon, simultaneously
Carbon residue in Zinc volatilization kiln slag is used as the reducing agent of reduction process, and by carrying out again after broken for Zinc volatilization kiln slag
Pelletizing, can significantly improve carbon residue and the contact area of metallic compound in Zinc volatilization kiln slag, thus reduce reduction cost
Improve reduction efficiency simultaneously, it addition, by adding Silicon stone and calcium system additive, the mobility of melting slag can be significantly improved, from
And the response rate of ferrum can be significantly improved.Thus, the present processes is used can to realize ferrum, lead, zinc, silver in Zinc volatilization kiln slag
With the synthetical recovery of indium, and the response rate of ferrum is more than 92%, and the response rate of lead is more than 96%, and the response rate of zinc is more than 98%,
The response rate of silver is more than 85%, and the response rate of indium is more than 85%.
With reference to Fig. 4, the system processing Zinc volatilization kiln slag according to embodiments of the present invention farther includes: waste-heat recovery device
500, chiller 600 and bagroom 700.
According to embodiments of the invention, surplus heat collection device 500 has flue dust entrance 501 and cooling flue dust outlet 502, cigarette
Dirt entrance 501 is connected with flue dust outlet 402, and is suitable to obtain rotary kiln carrying out waste heat recovery containing Pb-Zn dust, is lowered the temperature
Flue dust.Thus, by obtained is carried out waste heat recovery containing Pb-Zn dust, can be used for generating electricity by this part of waste heat, and
The temperature of cooling flue dust is down to 400 degrees centigrade, thus realizes maximally utilizing of resource.
According to embodiments of the invention, chiller 600 has cooling flue dust entrance 601 and cooling flue dust outlet 602, fall
Temperature flue dust entrance 601 is connected with cooling flue dust outlet 502, and is suitable to cooling flue dust obtained above is carried out cooling process, can
To obtain cooling down flue dust.Concrete, chiller can be surface-cooler, and flue dust temperature after surface-cooler of lowering the temperature
It is down to 250 degrees centigrade.
According to embodiments of the invention, bagroom 700 has cooling flue dust entrance 701, dust outlet 702 and gas
Outlet 703, cooling flue dust entrance 701 is connected with cooling flue dust outlet 602, and is suitable to cooling flue dust obtained above is carried out cloth
Bag gathers dust, such that it is able to collect dust.
Below with reference to specific embodiment, present invention is described, it should be noted that these embodiments are only to describe
Property, and limit the present invention never in any form.
Embodiment 1
Iron content 24wt% in Zinc volatilization kiln slag, wherein metallic iron accounts for full ferrum 53wt%, and lead content is 1.5wt%, Zn content
For 3.8wt%, silver content is 110g/t, and carbon content is 35wt%, and indium content is 180g/t；First Zinc volatilization kiln slag is crushed to
Particle diameter is not higher than 3mm with post-drying, obtains moisture and is not higher than 0.5wt% kiln slag and dries material, then passes through disc balling machine
Carry out pelletizing, obtain pelletizing, molten for a combustion gas point furnace temperature is raised to 1560 degrees Celsius, is incubated 30 minutes, then put into after drying
Pelletizing carries out making molten bath, makes bath surface reach combustion gas and melts 1/3rd of point stove height, after molten bath is made, throws continuously
Material, the process of feeding intake must assure that the material of last batch all melts and casts a batch of material the most again, makes bath surface reach combustion
Gas melts 3/5ths of point stove height, and feed intake end, adds Silicon stone and calcium oxide, it is ensured that in molten bath, the basicity of liquation is 1.2,
Being incubated 1.5 hours at 1560 DEG C, leaded zinc-silver indium flue dust is discharged from flue, it is achieved slag sluicing system and the volatilization of valuable metal,
Obtaining the molten iron of Iron grade 95% eventually, dust arrester installation can collect the dust of Zn content 62wt%, after testing, the response rate of ferrum
Being 92.11%, the response rate of lead is 96.58%, and the response rate of zinc is 98.29%, and the response rate of silver is 85.63%, returning of indium
Yield is 85.01%.
Embodiment 2
Iron content 32wt% in Zinc volatilization kiln slag, wherein metallic iron accounts for full ferrum 55wt%, and lead content is 1.8wt%, Zn content
For 4.3wt%, silver content is 120g/t, and carbon content is 38wt%, and indium content is 220g/t；Zinc volatilization kiln slag is crushed to particle diameter
Not higher than 3mm, with post-drying, is obtained moisture and is not higher than 0.5wt% drying broken material, then carried out by disc balling machine
Pelletizing, obtains pelletizing, molten for a combustion gas point furnace temperature is raised to 1580 degrees Celsius, is incubated 30 minutes, then put into the pelletizing after drying
Carry out making molten bath, make bath surface reach combustion gas and melt 1/3rd of point stove height, after molten bath is made, carry out continuous dosing,
The process of feeding intake must assure that the material of last batch all melts and casts a batch of material the most again, makes bath surface reach combustion gas and melts
Dividing 3/5ths of stove height, feed intake end, adds Silicon stone and calcium oxide, it is ensured that in molten bath, the basicity of liquation is 1.2,1580
Being incubated 2.5 hours under degree Celsius, leaded zinc-silver indium flue dust is discharged from flue, it is achieved slag sluicing system and the volatilization of valuable metal.?
Obtaining the molten iron of Iron grade 96% eventually, dust arrester installation can collect the dust of Zn content 63wt%, after testing, the response rate of ferrum
Being 93.28%, the response rate of lead is 97.02%, and the response rate of zinc is 98.55%, and the response rate of silver is 86.22%, returning of indium
Yield is 86.99%
Embodiment 3
Iron content 38wt% in Zinc volatilization kiln slag, wherein metallic iron accounts for full ferrum 49wt%, and lead content is 3.0wt%, Zn content
For 5.0wt%, silver content is 138g/t, and carbon content is 33wt%, and indium content is 256g/t；First Zinc volatilization kiln slag is crushed to
Particle diameter is not higher than 3mm with post-drying, obtains moisture and is not higher than the crushing drying material of 0.5wt%, then by disk pelletizing
Machine carries out pelletizing, obtains pelletizing, molten for a combustion gas point furnace temperature is raised to 1600 degrees Celsius, is incubated 30 minutes, then put into after drying
Kiln slag pelletizing carry out making molten bath, make bath surface reach combustion gas and melt 1/3rd of point stove height, after molten bath is made, carry out
Continuous dosing, the process of feeding intake must assure that the material of last batch all melts and casts a batch of material the most again, makes bath surface
Reaching combustion gas and melt 3/5ths of point stove height, feed intake end, adds Silicon stone and calcium carbonate, it is ensured that in molten bath, the basicity of liquation exists
1.4, under 1600 degrees Celsius, it is incubated 2.5 hours, leaded zinc-silver indium flue dust is discharged from flue, it is achieved slag sluicing system and valuable metal
Volatilization, finally give the molten iron of Iron grade 98%, dust arrester installation can collect the dust of Zn content 64wt%, after testing,
The response rate of ferrum is 94.27%, and the response rate of lead is 98.50%, and the response rate of zinc is 99.00%, and the response rate of silver is
87.25%, the response rate of indium is 88.87%.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
One or more embodiments or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification.
Claims (10)
1. the method processing Zinc volatilization kiln slag, it is characterised in that including:
(1) Zinc volatilization kiln slag is carried out break process, in order to obtain kiln slag broken material；
(2) described kiln slag broken material is carried out drying and processing, in order to obtain crushing drying material；
(3) described crushing drying material is carried out pelletizing, in order to obtain pelletizing；
(4) described pelletizing is divided in stove to combustion gas is molten with Silicon stone and the additive supply of calcium system, in order to obtain containing Pb-Zn dust, molten iron
And melting slag.
Method the most according to claim 1, it is characterised in that in step (1), the particle diameter of described kiln slag broken material is the highest
In 3mm.
Method the most according to claim 1, it is characterised in that in step (2), the water content of described crushing drying material is not
Higher than 0.5wt%.
Method the most according to claim 1, it is characterised in that step (4) is carried out according to the following step:
(4-1) carry out making molten bath to molten point of stove of described combustion gas by the part supply of described pelletizing；
(4-2) another part of described pelletizing, described Silicon stone and the additive supply of described calcium system are carried out also to described molten bath
Former reaction, in order to obtain containing Pb-Zn dust, molten iron and melting slag.
Method the most according to claim 4, it is characterised in that in step (4-1), exists molten for a described combustion gas point furnace temperature
It is incubated 20～40 minutes, preferably insulation 30 minutes under 1550～1600 degrees Celsius.
Method the most according to claim 4, it is characterised in that in step (4-2), described reduction reaction be 1550～
Carry out under 1600 degrees Celsius 1～2.5 hour.
Method the most according to claim 5, it is characterised in that in step (4-2), the basicity of described molten bath inner melt is
1.1～1.4.
Method the most according to claim 4, it is characterised in that farther include:
(5) waste heat recovery is carried out described containing Pb-Zn dust, in order to obtain flue dust of lowering the temperature；
(6) described cooling flue dust is carried out cooling process, in order to cooling flue dust；
(7) described cooling flue dust is carried out bag collection, in order to collect dust.
9. the system of the method processing Zinc volatilization kiln slag implemented according to any one of claim 1-8, it is characterised in that
Including:
Breaker, described breaker has Zinc volatilization kiln slag entrance and the outlet of kiln slag broken material；
Drying unit, described drying unit has kiln slag broken material entrance and the outlet of crushing drying material, and described kiln slag broken material enters
Mouth is connected with the outlet of described kiln slag broken material；
Palletizing device, described palletizing device has crushing drying material entrance and pelletizing outlet, described crushing drying material entrance and institute
State the outlet of crushing drying material to be connected；
Molten point of stove of combustion gas, the molten point stove of described combustion gas has the outlet of pelletizing entrance, flue dust, molten iron outlet and melting slag outlet, described
Pelletizing entrance is connected with the outlet of described pelletizing.
System the most according to claim 9, it is characterised in that farther include:
Waste-heat recovery device, described waste-heat recovery device has flue dust entrance and cooling flue dust outlet, described flue dust entrance and institute
State flue dust outlet to be connected；
Chiller, described chiller has cooling flue dust entrance and cooling flue dust outlet, described cooling flue dust entrance and institute
State cooling flue dust outlet to be connected；
Bagroom, described bagroom has cooling flue dust entrance, dust outlet and gas outlet, described cooling flue dust
Entrance is connected with the outlet of described cooling flue dust.
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| CN107746962A (en) * | 2017-10-17 | 2018-03-02 | 江苏省冶金设计院有限公司 | The method for handling white cigarette dirt |
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| CN109182771A (en) * | 2018-11-13 | 2019-01-11 | 常宁市华兴冶化实业有限责任公司 | A method of recycling zinc from Zinc volatilization kiln slag |
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