CN113604676A - Method for treating residual pot powder - Google Patents

Method for treating residual pot powder Download PDF

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Publication number
CN113604676A
CN113604676A CN202110798604.5A CN202110798604A CN113604676A CN 113604676 A CN113604676 A CN 113604676A CN 202110798604 A CN202110798604 A CN 202110798604A CN 113604676 A CN113604676 A CN 113604676A
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Prior art keywords
powder
zinc
leaching
residual
boiler
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CN202110798604.5A
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CN113604676B (en
Inventor
王洪亮
陈浩
陈国木
何金
倪源
刘云川
李明超
刘自虎
胡德虎
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YUNNAN YUNTONG ZINC CO Ltd
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YUNNAN YUNTONG ZINC CO Ltd
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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
    • C22B7/02—Working-up flue dust
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/22—Obtaining zinc otherwise than by distilling with leaching with acids
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/26—Refining solutions containing zinc values, e.g. obtained by leaching zinc ores
    • 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
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • 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 method for treating waste pot powder, which comprises the following steps: providing residual boiler powder, wherein the residual boiler powder is obtained by collecting zinc leaching residues produced in the zinc hydrometallurgy process at a waste heat boiler after the zinc leaching residues are subjected to reduction volatilization in a rotary kiln; adding the residual pot powder and the pickle liquor into a reaction tank for neutral leaching reaction to obtain a mixed liquor; filtering the mixed solution to obtain filtrate and filter residue; and sending the filtrate to a zinc hydrometallurgy system, and sending the filter residue to the rotary kiln for reduction and volatilization. According to the invention, the residual pot powder and the electric dust collection powder are separately treated, and because the zinc in the residual pot powder is subjected to neutral leaching and the zinc-containing filtrate is sent to a wet zinc smelting system, the loss of metal zinc caused by the fact that metal zinc is carried in lead slag when the residual pot powder and the electric dust collection powder are mixed together for wet acid leaching treatment is reduced; meanwhile, iron in the residual pot powder enters the kiln slag, so that the final iron slag amount is reduced, and the cost for treating the iron slag is reduced.

Description

Method for treating residual pot powder
Technical Field
The invention relates to the field of zinc hydrometallurgy, in particular to a method for treating waste boiler powder.
Background
In the process of zinc hydrometallurgy, zinc calcine is leached by electrolytic sulfuric acid waste liquid to produce wet-process ore pulp, and the wet-process ore pulp is subjected to plate-and-frame filter pressing to obtain zinc leaching residue (the main component is zinc ferrite, and the chemical formula is ZnO. Fe)2O3) And reducing and volatilizing the zinc leaching residues by a rotary kiln pyrogenic process, and collecting dust to obtain secondary zinc oxide powder (the main component is ZnO). According to the difference of the position and the type of dust collecting equipment, the obtained secondary zinc oxide powder has different components and specific names. The secondary zinc oxide powder collected at the waste heat boiler is named as waste boiler powder, and the main element components comprise, by weight, Zn less than 40%, Fe more than 12%, Pb more than 6%, S more than 3%, C more than 10%, and organic matter more than 14%; the secondary zinc oxide powder collected at the electric dust collection part is named as electric dust collection powder, and the main element components of the secondary zinc oxide powder comprise, by weight, Zn more than 57%, Fe less than 6%, Pb more than 7%, S more than 3%, C less than 3%, and organic matter more than 6%. Compared with electric dust collection, the residual heat boiler is closer to the blanking area of the rotary kiln, and the mixture of leached slag and fuel is seriously carried by the machine, so that the impurity content in the residual boiler powder is high, the valuable metal grade is low, and the impurity Fe content in the residual boiler powder is more than 2 times of that of the electric dust collection powder.
At present, the process for treating the zinc oxide powder of the type is as follows: mixing the rest boiler powder and electric dust-collecting powder, adding acid leaching solution (containing H as main component)2SO4) Leaching Zn which exists in a ZnO form and is easy to leach, and leaching Zn which is difficult to leach such as zinc ferrite and the like in secondary zinc oxide powder sequentially,Secondary acid leaching and tertiary acid leaching, wherein the secondary acid leaching liquor (the main component is H)2SO4) As primary acid leaching solution and tertiary acid leaching filtrate (with main component of H)2SO4) As a secondary pickle liquor. In the processes of primary acid leaching, secondary acid leaching and tertiary acid leaching, the electric dust collection powder and iron in the rest pot powder enter a solution, a large amount of iron slag is produced by subsequent iron precipitation and treated, lead slag containing about 10 percent (mass percent) of zinc is finally produced, and a large amount of metal zinc is lost due to the fact that zinc in the lead slag is not valued at the time of taking out.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for treating waste pot powder, and aims to solve the problem that metal zinc loss is large due to the fact that lead slag produced by treating the waste pot powder in the prior art carries with the metal zinc.
The technical scheme of the invention is as follows:
the invention provides a method for treating waste pan powder, which comprises the following steps:
providing residual boiler powder, wherein the residual boiler powder is obtained by collecting zinc leaching residues produced in the zinc hydrometallurgy process at a waste heat boiler after the zinc leaching residues are subjected to reduction volatilization in a rotary kiln;
adding the residual pot powder and the pickle liquor into a reaction tank for neutral leaching reaction to obtain a mixed liquor;
filtering the mixed solution to obtain filtrate and filter residue;
and sending the filtrate to a zinc hydrometallurgy system, and sending the filter residue to the rotary kiln for reduction and volatilization.
Optionally, the components of the residual boiler powder comprise ZnO and ZnO-Fe2O3、ZnS、PbO。
Optionally, the composition of the pickle liquor comprises H2SO4。
Optionally, the acidity of the pickle liquor is greater than 100 g/L.
Optionally, the temperature of the neutral leaching reaction is 55-65 ℃, and the time of the neutral leaching reaction is 1.5-3 h.
Optionally, the PH of the mixed solution is 4.0-4.5.
Optionally, the mixed liquor is filtered through a plate and frame filter press.
Optionally, the specific step of sending the filter residue to the rotary kiln for reduction and volatilization comprises:
and mixing the filter residue with fuel, and then conveying the mixture to the rotary kiln for reduction and volatilization.
In a second aspect of the present invention, there is provided a method for treating zinc leaching residues produced in a zinc hydrometallurgy process, wherein the method comprises the steps of:
conveying zinc leaching residues produced in the zinc hydrometallurgy process to a rotary kiln for reduction and volatilization to obtain residual pot powder and electric dust collection powder;
the residual pot powder is treated by the method for treating the residual pot powder.
Optionally, after zinc leaching residues produced in the zinc hydrometallurgy process are sent to a rotary kiln for reduction and volatilization, electric dust collection powder can also be obtained; and sequentially carrying out neutral leaching, primary acid leaching, secondary acid leaching and tertiary acid leaching on the electric dust collection powder.
Has the advantages that: the invention provides a method for treating waste boiler powder, which comprises the steps of adding the waste boiler powder and pickle liquor, which are collected at a waste heat boiler after zinc leaching residues produced in a wet zinc smelting process are reduced and volatilized in a rotary kiln, into a reaction tank for reaction to obtain mixed liquor, filtering the mixed liquor to obtain filtrate containing zinc ions and filter residues containing elements such as lead and iron, sending the filtrate containing the zinc ions to a wet zinc smelting system, sending the filter residues containing the elements such as lead and iron to the rotary kiln for continuous reduction and volatilization treatment, recovering lead elements after reduction and volatilization into zinc oxide powder, and finally enabling iron elements to enter kiln residues in the form of iron oxides. Compared with the existing technology in which the residual boiler powder and the electric dust-collecting powder are mixed and treated with acid leaching, the invention separately treats the residual boiler powder and the electric dust-collecting powder, because the zinc in the residual boiler powder is leached neutral and the filtrate containing zinc ions is sent to a zinc hydrometallurgy system, the loss of metal zinc caused by the metal zinc carried by lead slag is reduced; meanwhile, iron in the residual boiler powder enters the kiln slag, so that the problem that the residual boiler powder with high iron content can produce a large amount of iron slag when the residual boiler powder and the electric dust collection powder are subjected to wet acid leaching treatment together is solved, and the cost for treating the iron slag is reduced.
Drawings
FIG. 1 is a flow chart of the existing treatment process of waste pot powder.
Fig. 2 is a flow chart of a waste boiler meal treatment process in the embodiment of the invention.
Detailed Description
The invention provides a method for treating waste pan powder, which is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, residual pot powder (the iron content of which is more than twice of that of electric dust collection powder) obtained by reducing and volatilizing leaching residues in a wet zinc smelting process by a rotary kiln pyrogenic process and collecting dust is mixed with the electric dust collection powder and then subjected to acid leaching treatment, and the specific process flow is shown in figure 1, and the residual pot powder and the electric dust collection powder are mixed and then added with acid leaching solution (the main component is H)2SO4) Neutral leaching is carried out, easy-to-leach Zn in the form of ZnO is leached to obtain filtrate and filter residue, the obtained filtrate is sent to a zinc hydrometallurgy system, meanwhile, in order to further leach the Zn which is difficult to leach in the filter residue in a medium way (such as zinc in zinc ferrite), the obtained filter residue needs to be sequentially subjected to primary acid leaching, secondary acid leaching and tertiary acid leaching, wherein secondary acid leaching filtrate (mainly comprising H as a main component)2SO4) As primary acid leaching solution and tertiary acid leaching filtrate (with main component of H)2SO4) As a secondary pickle liquor. In the processes of primary acid leaching, secondary acid leaching and tertiary acid leaching, the electric dust collection powder and iron in the residual pot powder enter a solution, lead slag and a filtrate containing iron ions are obtained after final filtration, a large amount of iron ions exist in the filtrate due to the fact that a large amount of iron exists in the residual pot powder, and a large amount of iron is produced by hydrolysis iron precipitation in the primary acid leaching filtrateSlag, the resulting iron slag, needs to be further processed in the rotary kiln and finally enters the kiln slag, and the processing of a large amount of iron slag costs a lot (e.g., the processing cost of the rotary kiln), so that iron slag is undesirable in the process. In addition, the produced lead slag contains about 10% of metallic zinc by mass, and a large amount of metallic zinc is lost due to the fact that zinc in the lead slag is not valued when the lead slag is sold. That is, in the prior art, the remaining boiler powder and the electric dust collecting powder are mixed and then subjected to acid leaching treatment, so that a large amount of iron slag and lead slag containing 10 mass percent of metallic zinc are finally produced, the former causes the increase of the treatment cost of the iron slag, and the latter causes the loss of a large amount of metallic zinc. Based on this, the embodiment of the present invention provides a method for processing waste boiler powder, which is used for separately processing the waste boiler powder and the electric dust collection powder, and the process flow chart of the method refers to the processing process part of the waste boiler powder in fig. 2, and the method includes the steps of:
s1, providing residual boiler powder, wherein the residual boiler powder is obtained by collecting zinc leaching residues produced in the zinc hydrometallurgy process at a waste heat boiler after the zinc leaching residues are subjected to reduction volatilization in a rotary kiln;
s2, adding the residual pot powder and the pickle liquor into a reaction tank for neutral leaching reaction to obtain a mixed liquor;
s3, filtering the mixed solution to obtain filtrate and filter residue;
and S4, sending the filtrate to a zinc hydrometallurgy system, and sending the filter residue to the rotary kiln for reduction and volatilization.
Zinc leaching residues produced in the zinc hydrometallurgy process contain zinc, valuable metals such as lead and indium, are reduced into metals in a rotary kiln and volatilized, then enter flue gas, are oxidized into oxides in the flue gas, and enter a dust collection system along with the flue gas to be collected, wherein residual boiler powder is collected at a waste heat boiler, and electric dust collection powder is collected at an electric dust collection position. In the embodiment, only the waste boiler powder and the pickle liquor collected at the waste heat boiler are added into a reaction tank for neutral leaching reaction to obtain a mixed liquor, the mixed liquor is filtered to obtain a filtrate containing zinc ions and a filter residue containing elements such as lead and iron, the filtrate containing the zinc ions is sent to a zinc hydrometallurgy system, the filter residue containing the elements such as lead and iron is sent to a rotary kiln for continuous reduction and volatilization treatment, the lead element is reduced and volatilized and enters zinc oxide powder for recovery, and the iron element finally enters the kiln residue in the form of iron oxide. Compared with the existing technology in which the residual boiler powder and the electric dust collection powder are mixed and subjected to acid leaching, in the embodiment, the residual boiler powder and the electric dust collection powder are separately treated, and because the zinc in the residual boiler powder is subjected to neutral leaching and the filtrate containing zinc ions is sent to a zinc hydrometallurgy system, the loss of metal zinc caused by the fact that metal zinc is carried by lead slag is reduced; meanwhile, iron and lead in the residual boiler powder respectively enter kiln slag and zinc oxide powder, so that the problem that a large amount of iron slag can be produced by the residual boiler powder with high iron content when the residual boiler powder and the electric dust collection powder are mixed together for wet acid leaching treatment is solved, the cost for treating the iron slag is reduced, the lead slag amount is reduced, and the loss of metal zinc caused by the fact that the lead slag carries the metal zinc is further reduced. When the method for treating the waste boiler powder in the embodiment is applied to a treatment process of zinc leaching residues produced in a zinc hydrometallurgy process, the existing main process flow does not need to be changed, the existing equipment can be utilized, and the industrial modification production is easy to realize, i.e., the treatment method in the embodiment does not need to change the existing treatment process of the electric dust collection powder (such as the electric dust collection powder treatment process part shown in fig. 2).
And (3) volatilizing and reducing zinc leaching residues produced in the zinc hydrometallurgy process in a rotary kiln, collecting residual boiler powder at a waste heat boiler, collecting electric dust collection powder at an electric dust collection position, and in step S1, only adding the residual boiler powder collected at the waste heat boiler and acid leaching solution into a reaction tank for neutral leaching reaction to obtain a mixed solution.
In step S1, in one embodiment, the components of the residual pot powder include ZnO, ZnO-Fe2O3ZnS, PbO, but not limited thereto. In this embodiment, the remaining pot powder mainly contains ZnO, ZnO. Fe2O3ZnS, PbO, ZnS and some organic matters, in this embodiment, Zn element in the remaining pot powder is mainly ZnO, ZnO. Fe2O3ZnS, the Fe element in the rest of the pot powder is mainly ZnO-Fe2O3The Pb element in the residual pot powder mainly exists in the form of PbO, and the S element in the residual pot powder mainly exists in the form of ZnS.
The residual pot powder comprises the following elements in percentage by weight: zn is less than 40%, Fe is more than 12%, Pb is more than 6%, S is more than 3%, and C is more than 10%. The content of Fe element impurity in the residual boiler powder is more than 2 times of that of electric dust collection powder (Fe is less than 6 percent).
In step S2, in one embodiment, the composition of the pickle liquor includes H2SO4The pickle liquor can be an acidic solution generated in the zinc hydrometallurgy process, but is not limited to the acid solution.
In step S2, Zn existing in the form of ZnO in the remaining pot powder is mainly leached, and the main chemical reaction of the neutral leaching reaction of the remaining pot powder and the pickle liquor is as follows:
ZnO+H2SO4＝ZnSO4+H2O
zinc and Zn in zinc oxide in residual pot powder after neutral leaching reaction2+Is present in the filtrate, while the other components are filtered off in the form of filter residue.
In one embodiment, the acidity of the pickle liquor is greater than 100 g/L. The acidity can ensure the leaching of zinc in the zinc oxide in the residual pot powder.
In one embodiment, the temperature of the neutral leaching reaction is 55-65 ℃, the time of the neutral leaching reaction is 1.5-3h, and the pH of the mixed solution is 4.0-4.5. That is, the reaction temperature of the remaining pot powder and the pickle liquor should be kept at 55-65 ℃ during the mixing reaction in the reaction tank, the reaction time is 1.5-3h, and the pH value of the solution system at the end of the reaction is controlled at 4.0-4.5, so that the zinc leaching rate is high while the iron leaching is avoided during the mixing reaction of the remaining pot powder and the pickle liquor in the reaction tank.
In one embodiment, the reaction tank is provided with a steam pipeline, and the temperature in the reaction tank is regulated and controlled by steam in the steam pipeline, so that the reaction temperature is controlled to be 55-65 ℃.
In step S3, the mixed solution is filtered to obtain a filtrate containing zinc ions and a filter residue containing elements such as iron and lead, and the filter residue contains unleached zinc and other elements in addition to the iron and lead, and the elements exist in the filter residue in the form of solid oxides or sulfides, and the filter residue is sent to a rotary kiln for further reduction and volatilization treatment, and finally enters the kiln residue.
In one embodiment, the mixed solution is filtered through a plate and frame filter press, but is not limited thereto.
In step S4, in one embodiment, the filtrate is sent to a zinc hydrometallurgy system, and subjected to purification, electrodeposition, and the like to obtain metallic zinc.
In one embodiment, the step of feeding the filter residue to the rotary kiln for reduction and volatilization comprises the following specific steps:
and mixing the filter residue with fuel, and then conveying the mixture to the rotary kiln for reduction and volatilization, so that valuable metals such as lead and the like can be recovered.
In one embodiment, the fuel is selected from one or two of coke powder and anthracite, but is not limited thereto.
The embodiment of the invention also provides a method for treating zinc leaching residues produced in the zinc hydrometallurgy process, the process flow of which is shown in figure 2, wherein the method comprises the following steps:
conveying the zinc leaching residues to a rotary kiln for reduction and volatilization to obtain residual pot powder;
the excess pan powder is processed by adopting the excess pan powder processing method of the embodiment of the invention;
in one embodiment, after zinc leaching residues produced in the zinc hydrometallurgy process are sent to a rotary kiln for reduction and volatilization, electric dust collection powder can be obtained, and the electric dust collection powder is treated by neutral leaching, primary acid leaching, secondary acid leaching and tertiary acid leaching in sequence. Sequentially carrying out neutral leaching, primary acid leaching, secondary acid leaching and tertiary acid leaching on the electric dust collection powder to obtain primary acid leaching filtrate and lead slag; neutralizing and precipitating indium and hydrolyzing and precipitating iron on the primary acid leaching filtrate in sequence to obtain indium slag and iron slag; and (4) conveying the iron slag to a rotary kiln for reduction and volatilization.
This is described in detail below with reference to fig. 2: leaching zinc calcine with electrolytic sulfuric acid waste liquid to produce wet-process pulp, and press-filtering the wet-process pulp with plate-and-frame machine to obtain filtrate containing zinc ions and zinc leaching residue (mainly containing zinc ferrite with chemical formula of ZnO. Fe)2O3) And (3) sending the filtrate containing zinc ions to a zinc hydrometallurgy system, and sending the zinc leaching residue to a rotary kiln for pyrogenic reduction volatilization and dust collection to obtain residual boiler powder, electric dust collection powder and kiln slag. Mixing the rest pot powder with pickle liquor (from acidic solution generated in zinc hydrometallurgy process, and containing H as main ingredient2SO4) And (2) neutral leaching to obtain filtrate containing zinc ions and filter residue containing iron and lead elements, sending the filtrate containing the zinc ions to a zinc hydrometallurgy system, sending the filter residue containing the iron and lead elements to a rotary kiln for continuous reduction and volatilization, and finally respectively entering kiln residue and zinc oxide powder. Then, mixing the electric dust collection powder with acid leaching solution for neutral leaching, leaching most of Zn existing in a ZnO form to obtain filtrate (zinc-containing ions) and filter residue, sending the filtrate (zinc-containing ions) to a zinc hydrometallurgy system, carrying out primary acid leaching on the filter residue (the acid leaching solution is secondary acid leaching solution obtained by secondary acid leaching) to obtain primary acid leaching filter residue and primary acid leaching filtrate, respectively carrying out neutralization indium precipitation and hydrolysis iron precipitation on the primary acid leaching filtrate to obtain indium slag and iron slag, sending the iron slag to a rotary kiln for continuous reduction and volatilization, and sending the filtrate obtained after the neutralization indium precipitation and the hydrolysis iron precipitation to the zinc hydrometallurgy system (not identified in the figure). And performing secondary acid leaching on the primary acid leaching filter residue (the acid leaching solution is a tertiary acid leaching filtrate obtained by tertiary acid leaching), so as to obtain a secondary acid leaching filtrate and a secondary acid leaching filter residue, wherein the secondary acid leaching filtrate is used as the acid leaching solution of the primary acid leaching, the secondary acid leaching filter residue is subjected to tertiary acid leaching, so as to obtain lead slag and a tertiary acid leaching filtrate, and the tertiary acid leaching filtrate is used as the acid leaching solution of the secondary acid leaching.
Compared with the prior art, in the embodiment, the zinc leaching residue is reduced and volatilized by a rotary kiln pyrogenic process, the residual pot powder and the electric dust collection powder are obtained after dust collection and are separately processed, the primary separation of zinc, lead and iron in the residual pot powder is realized, most of zinc in the residual pot powder exists in the filtrate in the form of zinc ions and is sent to a wet zinc smelting system, the iron and the lead in the residual pot powder are not leached in the neutral leaching process, but enter the rotary kiln in the form of filter residues, and finally enter the kiln slag and the zinc oxide powder respectively. Therefore, in the embodiment, only the electric dust collection powder is subjected to primary acid leaching, secondary acid leaching and tertiary acid leaching, so that the problem that a large amount of iron slag is produced by the residual boiler powder with high iron content when the residual boiler powder and the electric dust collection powder are mixed together for wet acid leaching treatment is solved, the amount of lead slag can be reduced, and the loss of metal zinc caused by the fact that the lead slag carries metal zinc can be reduced.
The invention is further illustrated by the following specific examples.
Example 1
9000 tons of zinc leaching residues are treated by a certain zinc smelting enterprise in a certain month, and 988.2 tons of residual boiler powder and 1912.5 tons of electric dust collection powder are respectively obtained after the zinc leaching residues are reduced and volatilized by a rotary kiln. The residual pot powder comprises the following main element components in percentage by weight: zn-39.15%, Fe-13.59%, Pb-6.37%; the electric dust collecting powder comprises the following main element components: zn-59.81%, Fe-5.38%, Pb-7.25%. According to the existing process flow (as shown in figure 1), the residual pot powder and the electric dust collection powder are mixed and then subjected to neutral leaching, primary acid leaching, secondary acid leaching and third acid leaching, 643.80 tons of iron slag and 1120.03 tons of lead slag are produced, the zinc content of the lead slag is 10.1 percent, and the loss of metal zinc caused by the sold lead slag is 113.12 tons.
Example 2
8970.9 tons of leaching residues are treated by a certain zinc smelting enterprise in a certain month, and 924.3 tons of residual boiler powder and 1898.1 tons of electric dust collection powder are respectively obtained after the zinc leaching residues are reduced and volatilized by a rotary kiln. The residual pot powder comprises the following main element components in percentage by weight: zn 39.72%, Fe 12.42%, Pb 6.82%; the electric dust collecting powder comprises the following main element components: zn 60.2%, Fe 5.81%, Pb 7.74%. By adopting the treatment process of the residual boiler powder (as shown in figure 2), the residual boiler powder and the pickle liquor are mixed in a reaction tank, the reaction temperature is controlled at 60 ℃, the pH of a solution system at the end of the reaction is 4.5, the reaction time is 2 hours, a plate-and-frame filter press is used for filter pressing after the reaction is finished, the filtrate is sent to a wet zinc smelting system, and the filter residue and the fuel are mixed and then treated in a rotary kiln. Mixing electric dust collection powder and acid leaching solution in a reaction tank, controlling the reaction temperature to be 60 ℃, controlling the pH value of a solution system at the end of reaction to be 4.5, controlling the reaction time to be 2h, carrying out filter pressing by using a plate-and-frame filter press after the reaction is finished, and carrying out primary acid leaching, secondary acid leaching and tertiary acid leaching on filter residues to obtain 299.33 tons of iron slag, 816.18 tons of lead slag, 9.6% of lead slag and 78.35 tons of metal zinc loss caused by sold lead slag.
Compared with the prior art, the process flow of the invention reduces 344.47 tons of produced iron slag per month and 34.77 tons of metal zinc loss caused by lead slag under the condition of 9000 tons of treatment capacity per month.
In summary, the method for processing the waste boiler powder provided by the invention separately processes the waste boiler powder and the electric dust collection powder, the zinc leaching residue produced in the wet zinc smelting process is reduced and volatilized by a rotary kiln, the waste boiler powder and the acid leaching solution collected at a waste heat boiler are added into a reaction tank for reaction, mixed liquor is obtained and filtered, filtrate containing zinc ions and filter residue containing lead and iron elements are obtained, the filtrate containing the zinc ions is sent to a wet zinc smelting system, the filter residue containing lead, iron and other elements is sent to the rotary kiln for continuous reduction and volatilization, and the iron elements and the lead elements finally enter the kiln residue and the zinc oxide powder respectively. Compared with the existing technology in which the residual boiler powder and the electric dust-collecting powder are mixed and treated with acid leaching, the invention separately treats the residual boiler powder and the electric dust-collecting powder, because the zinc in the residual boiler powder is leached neutral and zinc-containing filtrate is sent to a zinc hydrometallurgy system, the loss of metal zinc caused by the metal zinc carried by lead slag is reduced; meanwhile, iron and lead in the residual boiler powder respectively enter the kiln slag and the zinc oxide powder, so that the problem that a large amount of iron slag is produced by the residual boiler powder with high iron content when the residual boiler powder and the electric dust collection powder are mixed together for wet acid leaching treatment is solved, the cost for treating the iron slag is further reduced, and in addition, compared with the case that the residual boiler powder and the electric dust collection powder are mixed together for acid leaching treatment, the method reduces the lead slag amount. Meanwhile, the treatment method does not need to change the existing main process flow, can utilize the existing equipment, and is easy to realize industrial modification production.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (10)

1. A method for processing waste pot powder is characterized by comprising the following steps:
providing residual boiler powder, wherein the residual boiler powder is obtained by collecting zinc leaching residues produced in the zinc hydrometallurgy process at a waste heat boiler after the zinc leaching residues are subjected to reduction volatilization in a rotary kiln;
adding the residual pot powder and the pickle liquor into a reaction tank for neutral leaching reaction to obtain a mixed liquor;
filtering the mixed solution to obtain filtrate and filter residue;
and sending the filtrate to a zinc hydrometallurgy system, and sending the filter residue to the rotary kiln for reduction and volatilization.
2. The method for treating the waste boiler meal as claimed in claim 1, wherein the components of the waste boiler meal comprise ZnO, ZnO-Fe2O3、ZnS、PbO。
3. The method for processing waste pan powder of claim 1, wherein the pickle liquor comprises H as a component2SO4。
4. The method for treating the waste pot meal as claimed in claim 1, wherein the acidity of the pickle liquor is more than 100 g/L.
5. The method for treating the waste boiler meal as claimed in claim 1, wherein the temperature of the neutral leaching reaction is 55-65 ℃, and the time of the neutral leaching reaction is 1.5-3 h.
6. The method for treating waste pot meal according to claim 1, wherein the pH of the mixed solution is 4.0-4.5.
7. The method for treating waste boiler meal according to claim 1, wherein the mixed liquor is filtered through a plate and frame filter press.
8. The method for treating the residual boiler meal as claimed in claim 1, wherein the specific step of conveying the filter residue into the rotary kiln for reduction and volatilization comprises the following steps:
and mixing the filter residue with fuel, and then conveying the mixture to the rotary kiln for reduction and volatilization.
9. A method for treating zinc leaching residues produced in a zinc hydrometallurgy process is characterized by comprising the following steps:
conveying zinc leaching residues produced in the zinc hydrometallurgy process to a rotary kiln for reduction and volatilization to obtain residual pot powder;
treating the waste pan powder by the method for treating waste pan powder according to any one of claims 1 to 8.
10. The method for treating zinc leaching residues produced in the zinc hydrometallurgy process according to claim 9, wherein after the zinc leaching residues produced in the zinc hydrometallurgy process are sent to a rotary kiln for reduction and volatilization, electric dust collecting powder can be obtained, and the electric dust collecting powder is treated by neutral leaching, primary acid leaching, secondary acid leaching and tertiary acid leaching in sequence.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754209A1 (en) * 1997-12-06 1999-06-10 Gock Eberhard Prof Dr Ing Habi Steelworks dust is treated by partially reduction, selective zinc leaching and lead compound flotation
CN103667720A (en) * 2013-12-26 2014-03-26 河南豫光锌业有限公司 Method for recovering zinc, indium, iron, and lead from high-iron zinc oxide mixture smelted with zinc
CN106115768A (en) * 2015-10-05 2016-11-16 李果 A kind of comprehensive cyclic utilization method of steel plant zinc smoke ash

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754209A1 (en) * 1997-12-06 1999-06-10 Gock Eberhard Prof Dr Ing Habi Steelworks dust is treated by partially reduction, selective zinc leaching and lead compound flotation
CN103667720A (en) * 2013-12-26 2014-03-26 河南豫光锌业有限公司 Method for recovering zinc, indium, iron, and lead from high-iron zinc oxide mixture smelted with zinc
CN106115768A (en) * 2015-10-05 2016-11-16 李果 A kind of comprehensive cyclic utilization method of steel plant zinc smoke ash

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