CN105671329A - Rotary hearth furnace and method for treating lead-zinc smelting slag - Google Patents
Rotary hearth furnace and method for treating lead-zinc smelting slag Download PDFInfo
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- CN105671329A CN105671329A CN201610179950.4A CN201610179950A CN105671329A CN 105671329 A CN105671329 A CN 105671329A CN 201610179950 A CN201610179950 A CN 201610179950A CN 105671329 A CN105671329 A CN 105671329A
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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
- 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
Abstract
The invention discloses a rotary hearth furnace and method for treating lead-zinc smelting slag. The rotary hearth furnace comprises a rotatable furnace hearth, an annular combustion chamber, a first partition wall and a second partition wall, wherein a smelting space is defined in the annular combustion chamber, and the smelting space sequentially comprises a feeding region, a lead volatilizing region, a zinc-iron reducing region and a discharging region along the rotating direction of the furnace hearth, wherein a lead outlet is formed in the lead volatilizing region, and a zinc outlet is formed in the zinc-iron reducing region; the first partition wall is arranged between the feeding region and the lead volatilizing region; and the second partition wall is arranged between the lead volatilizing region and the zinc-iron reducing region. By using the rotary hearth furnace, lead, zinc and iron in the lead-zinc smelting slag can be separately separated.
Description
Technical field
The invention belongs to metallurgical technology field, specifically, the present invention relates to a kind of rotary hearth furnace and the method that process lead-zinc smelting slag.
Background technology
Containing the metallurgical slag (dust) of plumbous zinc mainly comprise lead, the waste residue of zinc metallurgical process and Steel Plant produce in inevitable a kind of metallurgical dust.
Plumbous and zinc is the important meals material that can not lack in national economic development process, is widely used in industrial production and mankind's activity. In recent years, lead-zinc smelting enterprise development is swift and violent, and China has become one of the most important lead-zinc production state in the whole world.
China's lead-zinc smelting scope of the enterprise and quantity expand year by year, and plumbous zinc output increases fast, and smelting technology obtains big progress. But, lead-zinc smelting technical process is complicated, and the link that pollutent produces is more. The fast development of lead-zinc smelting, causes the generation of a large amount of waste gas, sewage, waste residue (such as Lead Smelting in Blast Furnace slag, yellow potassium iron vanadium slag) etc., causes serious environmental pollution. Wherein, the generation of waste residue is more. According to the statistics in National Development and Reform Commission's " large solid waste utilizes embodiment ", China is approximately 3.15 hundred million tons in the useless fishing amount of smelting of output in 2010, and wherein only the generation of lead-zinc smelting slag just reaches 4,300,000 tons.
Due to the difference of Iron and Steel Production structure, countries in the world Steel Plant Zn-Pb-containing dusts is also not quite similar. External due to the increase of Electric furnace steel making ratio in process for making and the increase of zinc-plated steel scrap proportioning, make to increase year by year containing the plumbous electric furnace dust amount of zinc, foreign iron and steel factory Zn-Pb-containing dusts, mainly from electric furnace, is secondly converter and blast furnace and other operation. Steel Plant's use in the most of province of south China is containing the plumbous higher iron ore of zinc, and the Dust Capacity of blast furnace output is big, measures higher containing zinc, lead; The increase that same zinc-plated sheet material and wear resisting steel part use, the expansion of EAF steelmaking plant scale and Electric furnace steel making ratio, makes the quantum of output of electric furnace dust increase, and zinc, lead content wherein also increase. China, containing zinc leaded steel ironworks dust mainly blast furnace dust and electric furnace dust, is secondly converter dust.
Lead-zinc smelting slag (dust) is rich in metallic iron, and gallium, indium, gold and the rare precious metal such as silver-colored, also containing the metal that the toxic element such as lead, cadmium, arsenic and transport property are strong. A large amount of lead-zinc smelting slag adopt traditional topple over arbitrarily, the outdoor processing mode banked up or simply fill, take the soil of big area, cause land resources in short supply. As time goes on, due to the effect that weathering and rainwater wash away, the metallic element in lead-zinc smelting slag can invade air, water body and soil, becomes important source of pollution. If not carrying out rational Collection and utilization, not only the health of harm humans and animal, affect the growth of plant and vegetation, and cause the waste of valuable metal resource.
In current Zn-Pb-containing dusts treatment process and approach, pyrogenic attack technique is comparatively ripe, more practical.But the common issue that these thermal process exist is: the product after 1) processing is the secondary dust containing zinc, lead oxides and iron slag mostly, or low-grade metal zinc, lead and molten iron; 2) its process is main for the purpose of the iron reclaimed in dust, and the plumbous secondary dust byproduct of zinc is as the raw material of zinc metallurgy or refining lead; 3) zinc after processing effectively is not separated with lead, will utilize zinc, lead resource, it is necessary to secondary dust is carried out reprocessing, and zinc is separated with lead, and this just considerably increases treatment process and cost. From research report, there is no both at home and abroad at present method process iron content low, containing plumbous high Zn-Pb-containing dusts, disposable separation of Zinc, plumbous effective treating method are not proposed yet.
Summary of the invention
One of technical problem that the present invention is intended to solve in correlation technique at least to a certain extent. For this reason, it is an object of the present invention to propose a kind of rotary hearth furnace and the method that process lead-zinc smelting slag, adopt this rotary hearth furnace can realize the independent separation of lead in lead-zinc smelting slag, zinc, iron.
In one aspect of the invention, the present invention proposes a kind of rotary hearth furnace processing lead-zinc smelting slag. According to embodiments of the invention, this rotary hearth furnace comprises;
At the bottom of rotatable stove;
Annular furnace, limits in described belt burner hearth and smelts space, and along furnace bottom turning direction, described smelting space comprises intake zone, lead volatility district, zinc-iron reduction zone and discharge zone successively, wherein, described lead volatility district has plumbous outlet, and described zinc-iron reduction zone has zinc outlet;
First partition wall, described first partition wall is arranged between described intake zone and described lead volatility district; And
2nd partition wall, described 2nd partition wall equipment is between described lead volatility district and described zinc-iron reduction zone.
Thus, the rotary hearth furnace of process lead-zinc smelting slag according to embodiments of the present invention is by being divided into intake zone successively by smelting space, lead volatility district, zinc-iron reduction zone and discharge zone, and by the temperature in control lead volatility district and zinc-iron reduction zone, plumbous oxide in lead-zinc smelting slag is recovered in lead volatility district, and the pelletizing containing ferric oxide and zinc oxide obtained carries out reduction reaction in zinc-iron reduction zone under the effect of reductive agent, ferric oxide and partial oxidation zinc is made to be reduced to metallic iron and metallic zinc, and the metallic zinc obtained and another part zinc oxide volatilize zinc-iron reduction zone and are recovered, obtain the metallized pellet containing metallic iron, thus solve in prior art plumbous in lead-zinc smelting slag, zinc, the difficult problem that cannot be separated separately of iron, and then avoid and follow-up utilize zinc, secondary dust must be carried out the technical process of reprocessing by lead resource, simultaneously by adopting the rotary hearth furnace of present configuration can realize iron in lead-zinc smelting slag, plumbous, zinc valuable element is recovered in the same apparatus, such that it is able to significantly reduce equipment investment cost, and then improve the economic benefit of enterprise.
In addition, the rotary hearth furnace of process lead-zinc smelting slag according to the above embodiment of the present invention can also have following additional technology feature:
In some embodiments of the invention, the rotary hearth furnace of described process lead-zinc smelting slag comprises further: the first flue, and described first flue is arranged on described lead volatility district and is connected with described lead outlet; And the 2nd flue, described 2nd flue is arranged on described zinc-iron reduction zone and is connected with the outlet of described zinc. Thus, it is possible to realize the independent recovery of plumbous in lead-zinc smelting slag, zinc and iron.
In the second aspect of the invention, the present invention proposes a kind of method processing lead-zinc smelting slag.According to embodiments of the invention, the method adopts the rotary hearth furnace of above-mentioned process lead-zinc smelting slag to carry out. According to a particular embodiment of the invention, the method comprises:
(1) reductive agent is mixed with binding agent carry out pelletizing, obtain female ball, then outside described female ball, wrap the mixture containing lead-zinc smelting slag and binding agent and carry out pelletizing, to obtain the pelletizing containing lead-zinc smelting slag and reductive agent;
(2) the described pelletizing containing lead-zinc smelting slag and reductive agent is made to enter described lead volatility district via described intake zone, to make the plumbous oxide in described pelletizing volatilize;
(3) material obtained in step (2) is made to enter described zinc-iron reduction zone, to make ferric oxide and partial oxidation zinc be reduced to metallic iron and metallic zinc under the effect of described reductive agent in described zinc-iron reduction zone, and zinc oxide volatilization, obtains the metallized pellet containing metallic iron described in described metallic zinc and another part;
(4) described metallized pellet is reclaimed in described discharge zone.
Thus, the method of process lead-zinc smelting slag according to embodiments of the present invention is undertaken after pelletizing as female ball by being mixed with binding agent by reductive agent, then outside female ball, wrap the mixture containing lead-zinc smelting slag and binding agent and carry out pelletizing, and the pelletizing that gained is contained lead-zinc smelting slag and reductive agent is supplied to and comprises intake zone successively, lead volatility district, in the rotary hearth furnace of zinc-iron reduction zone and discharge zone, and by the temperature in control lead volatility district and zinc-iron reduction zone, plumbous oxide in lead-zinc smelting slag is recovered in lead volatility district, and the pelletizing containing ferric oxide and zinc oxide obtained carries out reduction reaction in zinc-iron reduction zone under the effect of reductive agent, ferric oxide and partial oxidation zinc is made to be reduced to metallic iron and metallic zinc, and the metallic zinc obtained and another part zinc oxide volatilize zinc-iron reduction zone and are recovered, obtain the metallized pellet containing metallic iron, thus solve in prior art plumbous in lead-zinc smelting slag, zinc, the difficult problem that cannot be separated separately of iron, and then avoid and follow-up utilize zinc, secondary dust must be carried out the technical process of reprocessing by lead resource, simultaneously by adopting the rotary hearth furnace of present configuration can realize iron in lead-zinc smelting slag, plumbous, zinc valuable element is recovered in the same apparatus, such that it is able to significantly reduce equipment investment cost, and then improve the economic benefit of enterprise.
In addition, the method for process lead-zinc smelting slag according to the above embodiment of the present invention can also have following additional technology feature:
In some embodiments of the invention, in step (1), the particle diameter of described female ball is 3～6mm.
In some embodiments of the invention, in step (1), described is 8～12mm containing the particle diameter of lead-zinc smelting slag and the pelletizing of reductive agent.
In some embodiments of the invention, in step (2), described first flue is utilized to reclaim described plumbous oxide. Thus, it is possible to significantly improve lead recovery.
In some embodiments of the invention, in step (1), in the described pelletizing containing lead-zinc smelting slag and reductive agent, C/O mol ratio is 1.2～1.8. Thus, it is possible to significantly improve the rate of recovery of zinc and iron.
In some embodiments of the invention, it is characterised in that, in step (3), utilize described 2nd flue to reclaim described metallic zinc and zinc oxide. Thus, it is possible to improve the rate of recovery of zinc further.
In some embodiments of the invention, the temperature in described lead volatility district is 700～1000 degrees Celsius, it is preferable that 750～950 degrees Celsius.Thus, it is possible to improve the plumbous rate of recovery further.
In some embodiments of the invention, the temperature of described zinc-iron reduction zone is 1200～1350 degrees Celsius. Thus, it is possible to significantly improve the separation efficiency of zinc and iron.
In some embodiments of the invention, the method for described process lead-zinc smelting slag comprises further: (5) are by mill ore magnetic selection or melt point method from described metallized pellet separation elemental metals iron.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage from accompanying drawing below combining to the description of embodiment becoming obviously and it should be readily understood that wherein:
Fig. 1 is the plan structure schematic diagram of the rotary hearth furnace processing lead-zinc smelting slag according to an embodiment of the invention;
Fig. 2 is the plan structure schematic diagram of the rotary hearth furnace of the process lead-zinc smelting slag according to another embodiment of the present invention;
Fig. 3 is the method flow schematic diagram processing lead-zinc smelting slag according to an embodiment of the invention;
Fig. 4 is the method flow schematic diagram of the process lead-zinc smelting slag according to another embodiment of the present invention.
Embodiment
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish. It is exemplary below by the embodiment being described with reference to the drawings, it is intended to for explaining the present invention, and limitation of the present invention can not be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", it is based on orientation shown in the drawings or position relation that the orientation of the instruction such as " circumference " or position are closed, it is only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device referred to or element must have specific orientation, with specific orientation structure and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " the 2nd " are only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technology feature. Thus, be limited with " first ", the feature of " the 2nd " can express or implicit comprise at least one this feature. In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, such as, it is possible to be fixedly connected with, it is also possible to be removably connect, or integral; Can be mechanically connected, it is also possible to be electrical connection; Can be directly be connected, it is also possible to be indirectly connected by intermediary, it is possible to be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction. For the ordinary skill in the art, it is possible to understand above-mentioned term concrete implication in the present invention according to particular case.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact. And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature. Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or tiltedly lower section, or only represent that fisrt feature level height is less than second feature.
In one aspect of the invention, the present invention discloses a kind of rotary hearth furnace processing lead-zinc smelting slag. With reference to figure 1, the rotary hearth furnace of process lead-zinc smelting slag according to embodiments of the present invention comprises: at the bottom of rotatable stove 100, annular furnace 200, first partition wall 300 and the 2nd partition wall 400.
According to embodiments of the invention, annular furnace 200 limits and smelts space (not shown), and along furnace bottom turning direction, smelt space and comprise intake zone 21 successively, lead volatility district 22, zinc-iron reduction zone 23 and discharge zone 24, and it is adapted so that the pelletizing containing lead-zinc smelting slag and reductive agent is successively through intake zone 21, lead volatility district 22, there is lead volatility reaction and reduction reaction in zinc-iron reduction zone 23 and discharge zone 24, and lead volatility district 22 has plumbous outlet 201, zinc-iron reduction zone 23 has zinc outlet 202, such that it is able to accomplished lead, zinc is separated with the independent of iron.
According to embodiments of the invention, the following step is adopted to obtain containing the pelletizing of lead-zinc smelting slag and reductive agent: first to be mixed with binding agent by reductive agent and carry out pelletizing, the pelletizing obtained is as female ball, then outside female ball, wrap the mixture containing lead-zinc smelting slag and binding agent and carry out pelletizing, obtain compound pelletizing, and the compound pelletizing obtained is dried. contriver finds, it is re-used as female ball and carries out the mode of pelletizing containing the mixture of lead-zinc smelting slag and binding agent after first reductive agent and binding agent being carried out pelletizing, it is rolled in innermost layer by reductive agent, reductive agent can be avoided directly to contact with lead-zinc smelting slag, such that it is able to make plumbous oxide first volatilize at low temperatures, and owing to reductive agent can not directly contact with lead-zinc smelting slag, make zinc oxide in lead volatility district can not be reduced to metallic zinc and volatilize, and in zinc-iron reduction zone, owing to plumbous oxide volatilization makes to be formed pore in pelletizing, reductive agent in pelletizing such as carbon can burn generation carbon monoxide, such that it is able to ferric oxide and partial oxidation zinc are reduced, the metallic zinc obtained and the volatilization of another part zinc oxide are discharged zinc-iron reduction zone and are recovered, and metallic iron is stayed and is formed metallized pellet in pelletizing, such that it is able to realize in lead-zinc smelting slag plumbous, zinc is separated with the independent of iron. it should be noted that, those skilled in the art can and according to actual needs the particular type of reductive agent and binding agent is selected, such as reductive agent can adopt carbonaceous reducing agent.
According to one embodiment of present invention, blending ratio containing lead-zinc smelting slag and reductive agent in the pelletizing of lead-zinc smelting slag and reductive agent is also not particularly limited, those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, middle reductive agent containing lead-zinc smelting slag and the pelletizing of reductive agent and lead-zinc smelting slag are 1.2～1.8 mix according to C/O mol ratio.
According to still a further embodiment, the female spherolite footpath containing reductive agent and binding agent is 3～6mm, can be 8～12mm containing the particle diameter of lead-zinc smelting slag and the pelletizing of reductive agent. Thus, it is possible not only to the volatilization efficiency significantly improving plumbous oxide, and the reduction reaction of ferric oxide and zinc oxide can be significantly improved, thus improve the independent receipts rate of lead, zinc and iron.
Another embodiment according to the present invention, the temperature in lead volatility district can be 700～1000 degrees Celsius, it is preferable that 750～950 degrees Celsius. Contriver finds, the beginning volatilization temperature of plumbous oxide is 750 degrees Celsius, and the beginning volatilization temperature of zinc oxide is 1200 degrees Celsius, by adopt this temperature can so that in pelletizing plumbous oxide volatilized, and zinc oxide can not volatilize, thus realize plumbous independent Separation and Recovery.
Another embodiment according to the present invention, the temperature of zinc-iron reduction zone is 1200～1350 degrees Celsius. Thus, it is possible not only to partial oxidation zinc is volatilized, and can so that ferric oxide and another part zinc oxide are reduced to metallic iron and metallic zinc, the recovery and the metallic zinc obtained is volatilized, thus realize the independent Separation and Recovery of zinc.
According to embodiments of the invention, the first partition wall 300 is arranged between intake zone 21 and lead volatility district 22, thus is separated out in intake zone and lead volatility, and only retains the distance that material passes through between the lower-most point of the first partition wall and furnace bottom.
According to embodiments of the invention, the 2nd partition wall 400 is arranged between lead volatility district 22 and zinc-iron reduction zone 23, thus is separated in lead volatility district and zinc-iron reduction zone, and only retains the distance that material passes through between the lower-most point of the 2nd partition wall and furnace bottom.
Concrete, pelletizing containing lead-zinc smelting slag and reductive agent is entered lead volatility district via intake zone, plumbous oxide in pelletizing is volatilized, and discharge through being arranged on the plumbous outlet in lead volatility district, and the rotation along with rotary hearth furnace, take off the pelletizing after except lead and enter zinc-iron reduction zone, partial oxidation zinc in pelletizing is volatilized, and ferric oxide and another part zinc oxide in pelletizing is reduced to metallic iron and metallic zinc under the effect of reductive agent, and partial oxidation zinc and metallic zinc are discharged through being arranged on the zinc outlet of zinc-iron reduction zone, metallic iron is stayed in pelletizing, obtain metallized pellet, and metallized pellet delivers to mill ore magnetic selection system or molten sub-system after coming out of the stove, isolate metallic iron and tailings.
The rotary hearth furnace of process lead-zinc smelting slag according to embodiments of the present invention is by being divided into intake zone successively by smelting space, lead volatility district, zinc-iron reduction zone and discharge zone, and by the temperature in control lead volatility district and zinc-iron reduction zone, plumbous oxide in lead-zinc smelting slag is recovered in lead volatility district, and the pelletizing containing ferric oxide and zinc oxide obtained carries out reduction reaction in zinc-iron reduction zone under the effect of reductive agent, ferric oxide and partial oxidation zinc is made to be reduced to metallic iron and metallic zinc, and the metallic zinc obtained and another part zinc oxide volatilize zinc-iron reduction zone and are recovered, obtain the metallized pellet containing metallic iron, thus solve in prior art plumbous in lead-zinc smelting slag, zinc, the difficult problem that cannot be separated separately of iron, and then avoid and follow-up utilize zinc, secondary dust must be carried out the technical process of reprocessing by lead resource, simultaneously by adopting the rotary hearth furnace of present configuration can realize iron in lead-zinc smelting slag, plumbous, zinc valuable element is recovered in the same apparatus, such that it is able to significantly reduce equipment investment cost, and then improve the economic benefit of enterprise.
With reference to figure 2, the rotary hearth furnace of process lead-zinc smelting slag according to embodiments of the present invention comprises further: the first flue 500 and the 2nd flue 600.
According to embodiments of the invention, the first flue 500 is arranged on lead volatility 22 district and exports 201 with lead and is connected, and is suitable for collecting the plumbous oxide exporting through lead and volatilizing.
According to embodiments of the invention, the 2nd flue 600 is arranged on zinc-iron reduction zone 23 and exports with zinc and 202 is connected, and is suitable for collecting and exports the metallic zinc volatilized and zinc oxide through zinc.
In the second aspect of the invention, the present invention proposes a kind of method processing lead-zinc smelting slag. According to embodiments of the invention, the method adopts the rotary hearth furnace of above-mentioned process lead-zinc smelting slag to carry out. Below with reference to Fig. 3, the method for the process lead-zinc smelting slag of the embodiment of the present invention is described in detail. According to embodiments of the invention, the method comprises:
S100: mixed with binding agent by reductive agent and carry out pelletizing, obtains female ball, then wraps the mixture containing lead-zinc smelting slag and binding agent outside female ball and carries out pelletizing
According to embodiments of the invention, reductive agent is mixed with binding agent and carries out pelletizing, obtain female ball, then outside female ball, wrap the mixture containing lead-zinc smelting slag and binding agent and carry out pelletizing, such that it is able to obtain the pelletizing containing lead-zinc smelting slag and reductive agent. Contriver finds, it is re-used as female ball and carries out the mode of pelletizing containing the mixture of lead-zinc smelting slag and binding agent after first reductive agent and binding agent being carried out pelletizing, it is rolled in innermost layer by reductive agent, reductive agent can be avoided directly to contact with lead-zinc smelting slag, such that it is able to make plumbous oxide first volatilize at low temperatures, and owing to reductive agent can not directly contact with lead-zinc smelting slag, make zinc oxide in lead volatility district can not be reduced to metallic zinc and volatilize, and then plumbous independent separation can be realized. It should be noted that, those skilled in the art can and according to actual needs the particular type of reductive agent and binding agent is selected, such as reductive agent can adopt carbonaceous reducing agent.
According to one embodiment of present invention, blending ratio containing lead-zinc smelting slag and reductive agent in the pelletizing of lead-zinc smelting slag and reductive agent is also not particularly limited, those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, middle reductive agent containing lead-zinc smelting slag and the pelletizing of reductive agent and lead-zinc smelting slag are 1.2～1.8 mix according to C/O mol ratio. According to still a further embodiment, can be 3～6mm containing female spherolite footpath of reductive agent and binding agent, can be 8～12mm containing the particle diameter of lead-zinc smelting slag and the pelletizing of reductive agent. Thus, it is possible not only to the volatilization efficiency significantly improving plumbous oxide, and the reduction reaction of ferric oxide and zinc oxide can be significantly improved, thus improve the independent receipts rate of lead, zinc and iron.
S200: make the pelletizing containing lead-zinc smelting slag and reductive agent enter lead volatility district via intake zone
According to embodiments of the invention, the pelletizing containing lead-zinc smelting slag and reductive agent is made to enter lead volatility district via intake zone, so that the plumbous oxide in pelletizing volatilizees and enters the first flue from lead outlet and reclaim.
Another embodiment according to the present invention, the temperature in lead volatility district can be 700～1000 degrees Celsius, it is preferable that 750～950 degrees Celsius. Contriver finds, the beginning volatilization temperature of plumbous oxide is 750 degrees Celsius, and the beginning volatilization temperature of zinc oxide is 1200 degrees Celsius, by adopt this temperature can so that in pelletizing plumbous oxide volatilized, and zinc oxide can not volatilize, thus realize plumbous independent Separation and Recovery.
S300: make the material obtained in step S200 enter zinc-iron reduction zone
According to embodiments of the invention, the pelletizing after the lead volatility obtained in step S200 is made to enter zinc-iron reduction zone, to make ferric oxide and partial oxidation zinc be reduced to metallic iron and metallic zinc under the effect of reductive agent in zinc-iron reduction zone, and metallic zinc and another part zinc oxide volatilize and enter the 2nd flue from zinc outlet and reclaim, and obtain the metallized pellet containing metallic iron.Concrete, in zinc-iron reduction zone, owing to making to be formed pore in pelletizing in the volatilization of lead volatility district plumbous oxide, reductive agent in pelletizing such as carbon can burn generation carbon monoxide, such that it is able to ferric oxide and partial oxidation zinc are reduced, the metallic zinc obtained and the volatilization of another part zinc oxide are discharged zinc-iron reduction zone and are recovered, and metallic iron is stayed and formed metallized pellet in pelletizing, are separated such that it is able to realize plumbous in lead-zinc smelting slag, zinc with the independent of iron.
Another embodiment according to the present invention, the temperature of zinc-iron reduction zone is 1200～1350 degrees Celsius. Thus, it is possible not only to partial oxidation zinc is volatilized, and can so that ferric oxide and another part zinc oxide are reduced to metallic iron and metallic zinc, the recovery and the metallic zinc obtained is volatilized, thus realize the independent Separation and Recovery of zinc.
S400: at discharge zone Footwall drift pellet
According to embodiments of the invention, along with the rotation of rotary hearth furnace, the metallized pellet that zinc-iron reduction zone obtains is come out of the stove through discharge zone.
The method of process lead-zinc smelting slag according to embodiments of the present invention carries out the mode of pelletizing by being re-used as female ball and the mixture containing lead-zinc smelting slag and binding agent after first reductive agent and binding agent being carried out pelletizing, it is rolled in innermost layer by reductive agent, reductive agent can be avoided directly to contact with lead-zinc smelting slag, such that it is able to make plumbous oxide first volatilize at low temperatures, and owing to reductive agent can not directly contact with lead-zinc smelting slag, make zinc oxide in lead volatility district can not be reduced to metallic zinc and volatilize, and in zinc-iron reduction zone, owing to plumbous oxide volatilization makes to be formed pore in pelletizing, reductive agent in pelletizing such as carbon can burn generation carbon monoxide, such that it is able to ferric oxide and partial oxidation zinc are reduced, the metallic zinc obtained and the volatilization of another part zinc oxide are discharged zinc-iron reduction zone and are recovered, and metallic iron is stayed and is formed metallized pellet in pelletizing, such that it is able to realize in lead-zinc smelting slag plumbous, zinc is separated with the independent of iron.
With reference to figure 4, the method for process lead-zinc smelting slag according to embodiments of the present invention comprises further:
S500: by mill ore magnetic selection method separating metal fe from metallized pellet
According to embodiments of the invention, metallized pellet carries out process separation through mill ore magnetic selection system after coming out of the stove in discharge zone and obtains metal simple-substance iron and tailings. It should be noted that, the concrete condition of mill ore magnetic selection can be selected by those skilled in the art according to actual needs.
It should be noted that, the feature and advantage described by the above-mentioned rotary hearth furnace for process lead-zinc smelting slag are equally applicable to the method for this process lead-zinc smelting slag, repeat no more herein.
Below with reference to specific embodiment, present invention is described, it is necessary to explanation, and these embodiments are only descriptive, and do not limit the present invention in any way.
Embodiment 1
The rotary hearth furnace of the process lead-zinc smelting slag of the embodiment of the present invention is utilized to be processed by lead-zinc smelting slag, this lead-zinc smelting slag ingredient is: TFe35.22wt%, PbO8.25wt%, ZnO5.55wt%, first by Jiao's powder and wilkinite in mass ratio for 100:2 mix after pelletizing, pelletizing size is not higher than 5mm, the pelletizing made is as female ball, then outside female ball, the mixture containing lead-zinc smelting slag and organic binder bond is wrapped, wherein lead-zinc smelting slag and organic binder bond are 100:5 Homogeneous phase mixing in mass ratio, the final size of the pelletizing obtained is 10mm, pelletizing is distributed in rotary hearth furnace after drying, in control lead volatility district, temperature is 950 DEG C ± 20 DEG C, plumbous oxide in pelletizing is volatilized, and collect lead oxide powder dirt in the first flue volatilized in district by being arranged on, in control zinc-iron reduction zone, temperature is 1320 DEG C ± 20 DEG C, this district's temperature passes through on-line monitoring, it is controlled to reducing atmosphere, make this district's interior portion zinc oxide volatilization, simultaneous oxidation iron is become metallic iron and metallic zinc with another part zinc oxide by Carbon monoxide reduction, and collect metallic zinc and zinc oxide dust by the 2nd flue being located in zinc-iron reduction zone, and during metallic iron stays, obtain metallized pellet after coming out of the stove in discharge zone, pass through mill ore magnetic selection, iron is separated with slag, obtain metal iron powder.
Embodiment 2
The rotary hearth furnace of the process lead-zinc smelting slag of the embodiment of the present invention is utilized to be processed by lead-zinc smelting slag, this lead-zinc smelting slag ingredient is: TFe28.22wt%, PbO7.25wt%, ZnO15.55wt%, first by Jiao's powder and wilkinite in mass ratio for 100:2 mix after pelletizing, pelletizing size is not higher than 4mm, the pelletizing made is as female ball, then outside female ball, the mixture containing lead-zinc smelting slag and organic binder bond is wrapped, wherein lead-zinc smelting slag and organic binder bond are 100:5 Homogeneous phase mixing in mass ratio, the final size of the pelletizing obtained is 9mm, pelletizing is distributed in rotary hearth furnace after drying, in control lead volatility district, temperature is 950 DEG C ± 20 DEG C, plumbous oxide in pelletizing is volatilized, and collect lead oxide powder dirt in the first flue volatilized in district by being arranged on, in control zinc-iron reduction zone, temperature is 1320 DEG C ± 20 DEG C, this district's temperature passes through on-line monitoring, it is controlled to reducing atmosphere, make this district's interior portion zinc oxide volatilization, simultaneous oxidation iron is become metallic iron and metallic zinc with another part zinc oxide by Carbon monoxide reduction, and collect metallic zinc and zinc oxide dust by the 2nd flue being located in zinc-iron reduction zone, and during metallic iron stays, obtain metallized pellet after coming out of the stove in discharge zone, pass through mill ore magnetic selection, iron is separated with slag, obtain metal iron powder.
In the description of this specification sheets, at least one embodiment that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to be contained in the present invention in conjunction with concrete feature, structure, material or feature that this embodiment or example describe or example. In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example. And, the concrete feature of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner. In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can be carried out combining and combining by the technician of this area.
Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and above-described embodiment can be changed, revises, replace and modification by the those of ordinary skill of this area within the scope of the invention.
Claims (10)
1. one kind processes the rotary hearth furnace of lead-zinc smelting slag, it is characterised in that, comprising:
At the bottom of rotatable stove;
Annular furnace, limits in described belt burner hearth and smelts space, and along furnace bottom turning direction, described smelting space comprises intake zone, lead volatility district, zinc-iron reduction zone and discharge zone successively, wherein, described lead volatility district has plumbous outlet, and described zinc-iron reduction zone has zinc outlet;
First partition wall, described first partition wall is arranged between described intake zone and described lead volatility district; And
2nd partition wall, described 2nd partition wall equipment is between described lead volatility district and described zinc-iron reduction zone.
2. rotary hearth furnace according to claim 1, it is characterised in that, comprise further:
First flue, described first flue is arranged on described lead volatility district and is connected with described lead outlet; And
2nd flue, described 2nd flue is arranged on described zinc-iron reduction zone and is connected with the outlet of described zinc.
3. one kind utilizes the method for the process lead-zinc smelting slag of the rotary hearth furnace described in claim 1 or 2, it is characterised in that, comprising:
(1) reductive agent is mixed with binding agent carry out pelletizing, obtain female ball, then outside described female ball, wrap the mixture containing lead-zinc smelting slag and binding agent and carry out pelletizing, to obtain the pelletizing containing lead-zinc smelting slag and reductive agent;
(2) the described pelletizing containing lead-zinc smelting slag and reductive agent is made to enter described lead volatility district via described intake zone, to make the plumbous oxide in described pelletizing volatilize;
(3) material obtained in step (2) is made to enter described zinc-iron reduction zone, to make ferric oxide and partial oxidation zinc be reduced to metallic iron and metallic zinc under the effect of described reductive agent in described zinc-iron reduction zone, and zinc oxide volatilization, obtains the metallized pellet containing metallic iron described in described metallic zinc and another part;
(4) described metallized pellet is reclaimed in described discharge zone.
4. method according to claim 3, it is characterised in that, in step (1), the particle diameter of described female ball is 3～6mm.
5. method according to claim 3 or 4, it is characterised in that, in step (1), described is 8～12mm containing the particle diameter of lead-zinc smelting slag and the pelletizing of reductive agent.
6. method according to any one of claim 3～5, it is characterised in that, in step (2), utilize described first flue to reclaim described plumbous oxide.
7. method according to any one of claim 3～6, it is characterised in that, in step (3), utilize described 2nd flue to reclaim described metallic zinc and zinc oxide.
8. method according to claim 7, it is characterised in that, the temperature in described lead volatility district is 700～1000 degrees Celsius, it is preferable that 750～950 degrees Celsius.
9. method according to claim 7, it is characterised in that, the temperature of described zinc-iron reduction zone is 1200～1350 degrees Celsius.
10. method according to claim 3, it is characterised in that, comprise further:
(5) by mill ore magnetic selection or molten point of method from described metallized pellet separation elemental metals iron.
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| CN106399702A (en) * | 2016-09-27 | 2017-02-15 | 江苏省冶金设计院有限公司 | Technology for recycling nonferrous metals in process of treating lead-zinc slag through rotary hearth furnace |
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| CN113774215A (en) * | 2021-09-13 | 2021-12-10 | 云南华鼎再生资源开发有限公司 | Method for recovering valuable metals in high-zinc high-lead smelting slag |
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| CN115259704A (en) * | 2022-05-18 | 2022-11-01 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | High-strength cementing material and preparation method and application thereof |
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