CN110358921B - Treatment process of zinc-containing dust and sludge solid waste - Google Patents
Treatment process of zinc-containing dust and sludge solid waste Download PDFInfo
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- CN110358921B CN110358921B CN201910754087.4A CN201910754087A CN110358921B CN 110358921 B CN110358921 B CN 110358921B CN 201910754087 A CN201910754087 A CN 201910754087A CN 110358921 B CN110358921 B CN 110358921B
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/04—Obtaining zinc by distilling
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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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
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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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- 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
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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
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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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- 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 belongs to the technical field of metallurgical solid waste treatment, and relates to a treatment process of zinc-containing dust and sludge solid waste, which comprises the steps of firstly carrying out classification planning on zinc-containing dust and sludge generated in the production process of a metallurgical enterprise, enabling the zinc content to be more than or equal to 5 percent, enabling the zinc content to be less than 5 percent, enabling the zinc content to enter a pyrogenic process, enabling residues generated in the wet process to enter the pyrogenic process again, enabling secondary zinc oxide powder (the zinc oxide content is less than or equal to 60 percent) generated in the pyrogenic process to enter the wet process again, classifying and planning the original zinc-containing dust and sludge, respectively adopting wet process and pyrogenic process combined treatment according to the difference of the zinc content, and carrying out overall planning; meanwhile, the wet method and the fire method can not be utilized or low-value products are subjected to cross combined deep treatment to supplement each other, so that the zinc-containing dust sludge waste of the metallurgical enterprises is more reasonably treated, and greater economic benefit is realized.
Description
Technical Field
The invention belongs to the technical field of metallurgical solid waste treatment, relates to a treatment process for solid waste containing zinc dust and sludge, and particularly relates to a treatment process for treating the solid waste containing the zinc dust and sludge by combining a pyrogenic process and a wet process.
Background
In actual production, iron and steel/nonferrous metallurgy enterprises can generate solid wastes such as dust, mud, slag and the like with different zinc-containing components. In the traditional treatment process, the wet method is generally suitable for treating the zinc-containing dust and sludge waste with the zinc content of more than or equal to 5%, the fire method is generally suitable for treating the zinc-containing dust and sludge waste with the zinc content of less than 5%, the wet method process comprises an acid method, an alkaline method, an ammonia method and the like, and the fire method process comprises a rotary hearth furnace, a rotary kiln and the like.
In the existing disposal process, only high-zinc dust sludge generated by enterprises is treated by a wet method, the product comprises high-purity zinc oxide powder (the content of zinc oxide is more than or equal to 95 percent) or zinc ingots (the content of zinc is more than or equal to 99 percent), good economic benefits can be generated by direct sale, but as the wet method dezincification rate is lower and is usually less than 70 percent, the residual residue contains about 2 percent of zinc, the residue is returned to production and utilization, and the cyclic enrichment of zinc element is still caused, so that the production is influenced; the pyrogenic process technology generally mixes high-zinc and low-zinc dust sludge waste generated by enterprises uniformly to obtain low-zinc mixed dust sludge, the product comprises secondary zinc oxide powder and metalized pellets, the pyrogenic dezincification rate is higher and is generally more than 90%, and the zinc content in the remaining metalized pellets is less than 0.5%, so that the secondary zinc oxide powder can be directly returned to production for recycling, but in the pyrogenic process technology, potassium, sodium, chlorine, lead and other elements can escape along with the zinc element, so that the secondary zinc oxide powder of the pyrogenic process product is low in grade, and the zinc oxide content is generally less than or equal to 60%, and good economic benefit cannot be realized.
Disclosure of Invention
In view of the above, the invention provides a treatment process for solid waste containing zinc dust and sludge, which aims to solve the problems of single treatment range and poor economic benefit of the traditional treatment method for solid waste containing zinc dust and sludge.
In order to achieve the purpose, the invention provides a treatment process of zinc-containing dust and sludge solid waste, which comprises the following steps:
A. classifying and planning the zinc-containing dust and sludge, namely classifying the zinc-containing dust and sludge into a class of zinc-containing dust and sludge with the zinc content of more than or equal to 5% and a class of zinc-containing dust and sludge with the zinc content of less than 5%, enabling the class of zinc-containing dust and sludge to enter a wet treatment process, and enabling the class of zinc-containing dust and sludge to enter a pyrogenic treatment process;
B. the residue obtained after the wet treatment process and the screened second class of zinc-containing dust sludge are used as raw materials to enter a pyrogenic treatment process for primary zinc extraction, and the secondary zinc oxide powder (the content of zinc oxide is less than or equal to 60%) generated by the pyrogenic treatment process and the screened first class of zinc-containing dust sludge are used as raw materials to enter the wet treatment process for secondary zinc extraction;
C. and B, preparing high-purity zinc oxide powder or zinc ingots from the high-zinc dust sludge obtained after the wet treatment process in the step B, serving as a zinc smelting raw material, and directly selling the high-purity zinc oxide powder or the zinc ingots, preparing metallized pellets from the low-zinc mixed dust sludge obtained after the pyrogenic treatment process, and directly returning the metallized pellets to the blast furnace for production and recycling.
Furthermore, after the wet treatment process in the step C, the zinc oxide content in the high-purity zinc oxide powder is more than or equal to 95%, and the zinc content in the zinc ingot is more than or equal to 99%.
Furthermore, after the pyrogenic treatment process of the step C, the pyrogenic dezincification rate is more than 90%, and the zinc content in the residual metallized pellets is less than 0.5%.
The invention has the beneficial effects that:
1. the treatment process for the solid waste containing the zinc dust and sludge is completely different from the traditional treatment mode of the solid waste containing the zinc dust and sludge, and the treatment process for the solid waste containing the zinc dust and sludge by combining the pyrogenic method and the wet method is characterized in that the original zinc dust and sludge are classified and planned, and the wet method and the pyrogenic method are respectively adopted for combined treatment according to the difference of the zinc content, so that the overall planning is realized; meanwhile, the wet method and the fire method can not be utilized or low-value products are subjected to cross combined deep treatment to supplement each other, so that the zinc-containing dust sludge waste of the metallurgical enterprises is more reasonably treated, and greater economic benefit is realized.
2. According to the treatment process of the zinc-containing dust and sludge solid waste, the zinc-containing dust and sludge solid waste is treated by combining the pyrogenic process and the wet process, on one hand, the zinc extraction rate can be further improved by more than 20% on the basis of the single wet treatment process, meanwhile, the residue which cannot be treated by the wet treatment process is treated by the pyrogenic process, and the iron element is recovered by 100%; on the other hand, the economic value of the secondary zinc oxide powder can be further improved by more than 1 time on the basis of a single pyrogenic process treatment process.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a process flow diagram of the treatment process of solid waste containing zinc dust sludge according to the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The process for treating the zinc-containing dust and sludge solid waste shown in figure 1 comprises the following steps:
A. classifying and planning the zinc-containing dust and sludge, namely classifying the zinc-containing dust and sludge into a class of zinc-containing dust and sludge with the zinc content of more than or equal to 5% and a class of zinc-containing dust and sludge with the zinc content of less than 5%, enabling the class of zinc-containing dust and sludge to enter a wet treatment process, and enabling the class of zinc-containing dust and sludge to enter a pyrogenic treatment process;
B. the residue obtained after the wet treatment process and the screened second class of zinc-containing dust sludge are used as raw materials to enter a pyrogenic treatment process for primary zinc extraction, and the secondary zinc oxide powder (the content of zinc oxide is less than or equal to 60%) generated by the pyrogenic treatment process and the screened first class of zinc-containing dust sludge are used as raw materials to enter the wet treatment process for secondary zinc extraction;
C. b, preparing high-purity zinc oxide powder or zinc ingots from the high-zinc dust sludge subjected to the wet treatment process, wherein the high-purity zinc oxide powder or the zinc ingots are directly sold as zinc smelting raw materials, the zinc oxide content in the high-purity zinc oxide powder is more than or equal to 95%, and the zinc content in the zinc ingots is more than or equal to 99%; the low-zinc mixed dust and sludge after the pyrogenic treatment process is prepared into metallized pellets, the metallized pellets are directly returned to a blast furnace for production and recycling, the pyrogenic dezincification rate is more than 90%, and the zinc content in the remaining metallized pellets is less than 0.5%.
The method provided by the invention has the advantages that the residue product which is produced by the wet process and cannot be directly utilized and the semi-finished product zinc hypoxide product produced by the pyrogenic process are subjected to crossed combined deep treatment inside the working procedure, and supplement each other, so that the zinc-containing dust sludge waste of the metallurgical enterprises is more reasonably treated, and meanwhile, greater economic benefit is realized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. A treatment process of zinc-containing dust and sludge solid waste is characterized by comprising the following steps:
A. classifying and planning the zinc-containing dust and sludge, namely classifying the zinc-containing dust and sludge into a class of zinc-containing dust and sludge with the zinc content of more than or equal to 5% and a class of zinc-containing dust and sludge with the zinc content of less than 5%, enabling the class of zinc-containing dust and sludge to enter a wet treatment process, and enabling the class of zinc-containing dust and sludge to enter a pyrogenic treatment process;
B. the residue after the wet treatment process and the screened second class of zinc-containing dust and sludge residues are used as raw materials to enter a pyrogenic treatment process for primary zinc extraction, and secondary zinc oxide powder generated by the pyrogenic treatment process and the screened first class of zinc-containing dust and sludge residues are used as raw materials to enter the wet treatment process for secondary zinc extraction, wherein the content of zinc oxide in the secondary zinc oxide powder is less than or equal to 60%;
C. and B, preparing high-purity zinc oxide powder or zinc ingots from the high-zinc dust sludge obtained after the wet treatment process in the step B, serving as a zinc smelting raw material, and directly selling the high-purity zinc oxide powder or the zinc ingots, preparing metallized pellets from the low-zinc mixed dust sludge obtained after the pyrogenic treatment process, and directly returning the metallized pellets to the blast furnace for production and recycling.
2. The process for treating solid waste containing zinc dust and sludge as defined in claim 1, wherein the zinc oxide content in the high purity zinc oxide powder is not less than 95% and the zinc content in the zinc ingot is not less than 99% after the wet treatment in step C.
3. The process for disposing of solid waste containing zinc dust as claimed in claim 2, wherein the rate of dezincification by pyrogenic process after the pyrogenic process disposal process of step C is more than 90%, and the zinc content in the remaining metallized pellet is less than 0.5%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910754087.4A CN110358921B (en) | 2019-08-15 | 2019-08-15 | Treatment process of zinc-containing dust and sludge solid waste |
| PCT/CN2020/106824 WO2021027634A1 (en) | 2019-08-15 | 2020-08-04 | Treatment process of zinc-containing dust sludge solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910754087.4A CN110358921B (en) | 2019-08-15 | 2019-08-15 | Treatment process of zinc-containing dust and sludge solid waste |
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| Publication Number | Publication Date |
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| CN110358921A CN110358921A (en) | 2019-10-22 |
| CN110358921B true CN110358921B (en) | 2021-02-02 |
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| CN201910754087.4A Active CN110358921B (en) | 2019-08-15 | 2019-08-15 | Treatment process of zinc-containing dust and sludge solid waste |
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| CN (1) | CN110358921B (en) |
| WO (1) | WO2021027634A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110358921B (en) * | 2019-08-15 | 2021-02-02 | 重庆赛迪热工环保工程技术有限公司 | Treatment process of zinc-containing dust and sludge solid waste |
| CN110724831A (en) * | 2019-10-31 | 2020-01-24 | 重庆赛迪热工环保工程技术有限公司 | Carbon circulating system and method for producing zinc oxide by industrially recycling zinc |
| CN114309020B (en) * | 2022-01-04 | 2023-06-13 | 重庆赛迪热工环保工程技术有限公司 | Pyrometallurgical zinc-containing dust sludge pyrogenic time-sharing disposal method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| BR0100348B1 (en) * | 2001-01-24 | 2012-03-20 | concentration and calcination process of zinc silicate minerals and concentrated zinc silicate product | |
| CN101624637A (en) * | 2009-08-13 | 2010-01-13 | 首钢总公司 | System and method for centralized classification treatment of steel metallurgic dust mud |
| CN102776376B (en) * | 2012-08-08 | 2013-10-30 | 汉源县广超有色金属综合回收有限责任公司 | Method for recovering valuable metal from waste residue containing lead and zinc through wet-fire combination process |
| JP6090080B2 (en) * | 2013-09-20 | 2017-03-08 | 住友金属鉱山株式会社 | Operation method of reduction roasting furnace |
| CN105293564A (en) * | 2015-10-05 | 2016-02-03 | 李果 | Method for recycling zinc-containing dust ash in steel plant |
| CN106119556A (en) * | 2016-06-27 | 2016-11-16 | 李果 | A kind of Application way of steel plant zinc smoke ash |
| CN110358921B (en) * | 2019-08-15 | 2021-02-02 | 重庆赛迪热工环保工程技术有限公司 | Treatment process of zinc-containing dust and sludge solid waste |
| CN110724831A (en) * | 2019-10-31 | 2020-01-24 | 重庆赛迪热工环保工程技术有限公司 | Carbon circulating system and method for producing zinc oxide by industrially recycling zinc |
| CN110775998A (en) * | 2019-10-31 | 2020-02-11 | 重庆赛迪热工环保工程技术有限公司 | System and method for producing nano zinc oxide by industrially recycling zinc |
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| Publication number | Publication date |
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| WO2021027634A1 (en) | 2021-02-18 |
| CN110358921A (en) | 2019-10-22 |
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