CN106048237B - The method for handling incineration of refuse flyash - Google Patents
The method for handling incineration of refuse flyash Download PDFInfo
- Publication number
- CN106048237B CN106048237B CN201610529278.7A CN201610529278A CN106048237B CN 106048237 B CN106048237 B CN 106048237B CN 201610529278 A CN201610529278 A CN 201610529278A CN 106048237 B CN106048237 B CN 106048237B
- Authority
- CN
- China
- Prior art keywords
- furnace
- lead
- fly ash
- slag
- oxidation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 50
- 230000003647 oxidation Effects 0.000 claims abstract description 47
- 230000009467 reduction Effects 0.000 claims abstract description 36
- 239000011701 zinc Substances 0.000 claims abstract description 29
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 27
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000003546 flue gas Substances 0.000 claims abstract description 20
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011787 zinc oxide Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims description 55
- 238000004056 waste incineration Methods 0.000 claims description 55
- 238000003723 Smelting Methods 0.000 claims description 42
- 239000000779 smoke Substances 0.000 claims description 14
- 239000008187 granular material Substances 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- LWUVWAREOOAHDW-UHFFFAOYSA-N lead silver Chemical compound [Ag].[Pb] LWUVWAREOOAHDW-UHFFFAOYSA-N 0.000 claims description 3
- 239000011505 plaster Substances 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 11
- 238000002844 melting Methods 0.000 abstract description 7
- 230000008018 melting Effects 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 238000005469 granulation Methods 0.000 abstract description 2
- 230000003179 granulation Effects 0.000 abstract description 2
- 239000003818 cinder Substances 0.000 abstract 2
- 239000008188 pellet Substances 0.000 abstract 2
- 239000003517 fume Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 44
- 238000006722 reduction reaction Methods 0.000 description 30
- 229910052681 coesite Inorganic materials 0.000 description 23
- 229910052906 cristobalite Inorganic materials 0.000 description 23
- 239000000377 silicon dioxide Substances 0.000 description 23
- 229910052682 stishovite Inorganic materials 0.000 description 23
- 229910052905 tridymite Inorganic materials 0.000 description 23
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 20
- 229910001385 heavy metal Inorganic materials 0.000 description 14
- 230000008901 benefit Effects 0.000 description 12
- 239000004568 cement Substances 0.000 description 12
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000000428 dust Substances 0.000 description 10
- 229910052745 lead Inorganic materials 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 229910052593 corundum Inorganic materials 0.000 description 7
- 239000010813 municipal solid waste Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- 239000002738 chelating agent Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- 229910052787 antimony Inorganic materials 0.000 description 3
- 229910052797 bismuth Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052960 marcasite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C22B13/00—Obtaining lead
- C22B13/02—Obtaining lead by dry processes
- C22B13/025—Recovery from waste materials
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of method for handling incineration of refuse flyash, this method includes：(raw material containing lead is supplied into oxidation furnace and carries out oxidizing semlting processing by (1), to obtain SO containing high concentration2Flue gas, lead bullion and oxidation clinker；(2) by incineration of refuse flyash coal mixing granulation, to obtain mixing pellet；(3) the oxidation clinker is supplied into reduction furnace progress reduction melting processing with mixing pellet, to obtain lead bullion, containing zinc furnace cinder and containing low concentration SO2Flue gas；And described supplied containing zinc furnace cinder into fuming furnace is carried out fuming process by (4), to obtain zinc oxide fumes and innoxious clinker.This method is used by the way that incineration of refuse flyash to be used as to the flux during oxidation clinker reduction melting, it is possible to achieve the innoxious and recycling treatment of incineration of refuse flyash, while refining lead cost can be reduced.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a method for treating waste incineration fly ash.
Background
Urban domestic garbage in developed countries of the world is mostly disposed of by incineration, and China mainly treats municipal domestic garbage by landfill. With the improvement of the degree of urban modernization, the ' twelve five ' national urban domestic garbage harmless treatment facility construction plan ' is provided to 2015, the capacity of the national urban domestic garbage incineration treatment facilities reaches more than 35% of the total capacity of the harmless treatment, the garbage power generation treatment scale needs to be increased from 8.96 ten thousand tons at the end of 2010 to about 30.7 ten thousand tons at the end of 2015, and the annual composite growth rate reaches 28%. The disposal of municipal waste in china is in the transition period from landfill to incineration. Preliminary calculation, about 300 ten thousand tons of waste incineration fly ash can be expected to be produced every year.
The fly ash from waste incineration mainly comprises CaO and CaSO4、SiO2、Al2O3MgO, heavy metals Pb, Cd, Hg, Cr, Cu, Zn, and dioxin. Because it contains dioxin and heavy metals, it is treated as dangerous solid waste at home and abroad. At present, the method for disposing the waste incineration fly ash at home mainly comprises the steps of curing and burying by using a chelating agent and cement, co-processing by using a cement kiln at a small part of the waste incineration fly ash, and performing slag melting vitrification treatment in foreign developed countries.
The chelating agent and cement curing landfill cost is low, but the problems of land occupation and resource waste exist in landfill; the synergistic treatment of the cement kiln needs to remove Cl in fly ash in advance to avoid influencing the cement quality, so the cost is higher, and the influence of heavy metal on the cement quality exists; ash melting is more advanced but at a relatively high cost.
Therefore, the existing technology for treating the waste incineration fly ash needs to be further improved and perfected.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a method for treating fly ash from waste incineration, which can realize harmless and recycling treatment of fly ash from waste incineration.
In one aspect of the invention, a method of treating fly ash from waste incineration is provided. According to an embodiment of the invention, the method comprises:
(1) the lead-containing raw material is fed into an oxidation furnace for oxidation smelting treatment SO as to obtain the lead-containing raw material containing high-concentration SO2Flue gas, lead bullion and oxidation furnace slag;
(2) mixing and granulating the waste incineration fly ash coal so as to obtain mixed granules;
(3) feeding the oxide slag and the mixed granules into a reduction furnace for reduction smelting treatment SO as to obtain crude lead, zinc-containing slag and low-concentration SO2Flue gas; and
(4) and feeding the zinc-containing slag into a fuming furnace for fuming treatment so as to obtain zinc oxide smoke and harmless slag.
Therefore, according to the method for treating the waste incineration fly ash provided by the embodiment of the invention, the lead-containing raw material is supplied to the oxidation furnace for oxidation smelting treatment, and then the waste incineration fly ash is used as the flux in the reduction smelting process of the oxidation furnace slag, so that the flux cost in the lead smelting process can be obviously reduced, the cost for separately treating the fly ash can be saved, dioxin in the waste incineration fly ash can be fully decomposed in the reduction treatment process, and the heavy metals in the fly ash can be effectively recovered, so that not only can harmful substances be effectively treated, but also the serious waste of resources caused by adopting landfill in the past can be avoided, the resource and harmless treatment of the waste incineration fly ash can be realized, and great economic benefits and social benefits are achieved.
In addition, the method for treating waste incineration fly ash according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the lead-containing raw material is at least one selected from the group consisting of lead concentrate, lead paste and lead silver slag.
In some embodiments of the invention, in the step (3), the mass ratio of the waste incineration fly ash to the oxidized slag is (1-5): 100.
in some embodiments of the invention, the temperatures of the oxidation smelting process, the reduction smelting process and the fuming process are each independently not less than 1000 degrees celsius.
In some embodiments of the invention, the method of treating waste incineration fly ash further comprises: (5) the low concentration of SO2The flue gas is sent to a tail gas desulfurization system. Therefore, S in the waste incineration fly ash and S-containing flue gas generated in the lead smelting reduction process are subjected to desulfurization treatment together, so that the environmental pollution of S is avoided.
In some embodiments of the invention, the oxidation furnace, the reduction furnace and the fuming furnace are each independently a top-blown furnace, a side-blown furnace or a bottom-blown furnace.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow diagram of a method for treating fly ash from waste incineration according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for treating fly ash from waste incineration according to still another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The inventors completed the present invention based on the following findings: the fly ash from waste incineration mainly comprises CaO and CaSO4、SiO2、Al2O3MgO, heavy metals Pb, Cd, Hg, Cr, Cu, Zn, and dioxin. Because it contains dioxin and heavy metals, it is treated as dangerous solid waste at home and abroad. At present, the method for disposing the waste incineration fly ash at home mainly comprises the steps of curing and burying by using a chelating agent and cement, co-processing by using a cement kiln at a small part of the waste incineration fly ash, and performing slag melting vitrification treatment in foreign developed countries. The chelating agent and cement curing landfill cost is low, but the problems of land occupation and resource waste exist in landfill; the synergistic treatment of the cement kiln needs to remove Cl in fly ash in advance to avoid influencing the cement quality, so the cost is higher, and the influence of heavy metal on the cement quality exists; ash melting is more advanced but relatively costly and further consideration is still needed for its recycling. The inventor of the invention actively explores the treatment process of the waste incineration fly ash, aims to overcome the defects in the prior art and realize the harmless and recycling treatment of the waste incineration fly ash.
In view of the above, in one aspect of the present invention, a method for treating fly ash from waste incineration is provided. According to an embodiment of the invention, the method comprises: (1) the lead-containing raw material is fed into an oxidation furnace for oxidation smelting treatment SO as to obtain the lead-containing raw material containing high-concentration SO2Flue gas, lead bullion and oxidation furnace slag; (2) mixing and granulating the waste incineration fly ash coal so as to obtain mixed granules; (3) feeding the oxide slag and the mixed granules into a reduction furnace for reduction smelting treatment SO as to obtain crude lead, zinc-containing slag and low-concentration SO2Flue gas; and (4) feeding the zinc-containing slag into a fuming furnace for fuming treatment so as to obtain zinc oxide smoke and harmless slag. The inventors have found that not only can significant improvement be achieved by supplying a lead-containing raw material to an oxidizing furnace for oxidation smelting treatment, but also by using waste incineration fly ash as a flux in an oxidation slag reduction smelting processThe method has the advantages that the flux cost in the lead smelting process is reduced, the cost for separately treating the fly ash can be saved, the dioxin in the waste incineration fly ash can be fully decomposed in the reduction treatment process, and the heavy metal in the fly ash can be effectively recovered, so that not only can harmful substances be effectively treated, but also the serious waste of resources caused by landfill in the past can be avoided, the resource and harmless treatment of the waste incineration fly ash can be realized, and the method has great economic benefit and social benefit.
The method for treating waste incineration fly ash according to the embodiment of the present invention will be described in detail with reference to fig. 1. According to an embodiment of the invention, the method comprises:
s100: supplying a lead-containing raw material to an oxidation furnace to perform an oxidation smelting treatment
According to the embodiment of the present invention, the lead-containing raw material is supplied to the oxidizing furnace to be subjected to the oxidizing smelting treatment, whereby the lead-containing raw material containing a high concentration of SO can be obtained2Flue gas, lead bullion, and oxidation furnace slag.
According to an embodiment of the present invention, the lead-containing raw material may be at least one selected from the group consisting of lead concentrate, lead paste, lead silver slag, and the like. Specifically, the lead-containing raw material comprises Pb, Zn, Cu, S, Fe, Si, Ca, Cd, Hg, Cr, Sb, Bi, Ag, Au and the like, and the lead raw material is different in content, but mainly contains Pb, Zn, Cu, S, Fe, Si and Ca.
Specifically, in the process, the chemical reactions in the oxidation furnace mainly include an oxidation reaction of oxygen and PbS and an interaction reaction of PbO and PbS: PbS +3/2O2＝PbO+SO2，Pb+1/2O2＝PbO，2PbO+PbS＝3Pb+SO2After the lead liquid is formed, oxidation reaction of lead takes place by taking lead as a carrier, and Fe is accompanied7S8、FeS2Oxidation and slagging reaction. In other words, only a part of the lead in the lead-containing material can be smelted in the oxidation furnace, and most of the lead is formed by PbO and Fe2O3、SiO2FeO, ZnO, CaO, etc. form low melting eutectic or eutectic, i.e., a bullion melt, from which Pb is derived in the form of a bullion meltAnd discharging the lead from the lead discharge port of the oxidation furnace, wherein a part of Cu, Sb, Bi, Ag, Au and the like enters the crude lead melt, and the other part of Cu, Sb, Bi, Ag, Au and the like enters the oxidation furnace slag. Pb enters flue gas because of being volatile, lead-containing smoke dust is obtained after dust collection and is returned to the batching again, and the smoke dust contains Zn, Cu, Si, Ca and the like. S enters the flue gas containing high-concentration SO2 in the form of sulfur dioxide.
According to still another embodiment of the present invention, the temperature of the oxidation smelting process in this step is not particularly limited, and may be selected by those skilled in the art according to actual needs, and according to a specific embodiment of the present invention, the temperature of the oxidation smelting process may be not lower than 1000 ℃. Therefore, the high-efficiency oxidation smelting treatment can be ensured.
S200: mixing and granulating the waste incineration fly ash and coal
According to the embodiment of the invention, the waste incineration fly ash and coal required for providing heat in the lead reduction and smelting process are mixed and granulated, so that mixed granules can be obtained. Therefore, the waste incineration fly ash can be effectively prevented from being easily taken away by smoke when being directly added into the reduction furnace through granulation, and the increase of smoke dust circulation volume is avoided.
According to an embodiment of the present invention, the ratio of the oxidized slag to the waste incineration fly ash in the mixed granules in this step is not particularly limited and may be selected by those skilled in the art according to actual needs, and according to a specific embodiment of the present invention, the waste incineration fly ash may be compounded in a ratio of the oxidized slag of 1 wt% to 5 wt%. The inventor finds that the lead smelting production is influenced by adding too little or too much waste incineration fly ash, the production of a subsequent fuming furnace is not facilitated by adding too little or too much waste incineration fly ash, and the zinc is easily reduced to enter smoke dust when the zinc is too much, so that the circulation quantity is increased.
S300: feeding the oxide slag and the mixed granules into a reduction furnace for reduction smelting treatment
According to the embodiment of the present invention, the oxide slag and the mixed granules obtained as described above are supplied to a reduction furnace and subjected to reduction smelting, whereby crude lead and lead-containing slag can be obtainedZinc slag and slag containing low concentration of SO2Flue gas. In this step, specifically, the oxide slag mainly undergoes a reduction reaction of lead in the reduction furnace, such as: c + O2＝CO2，2C+O2＝2CO，CO+1/2O2＝CO2，PbO+CO＝Pb+CO2，PbO+C＝Pb+CO，2PbO·SiO2+2FeO+C＝2Pb+2FeO·SiO2+CO2，2PbO·SiO2+2CaO+C＝2Pb+2CaO·SiO2+CO2，ZnO·Fe2O3+SiO2+C＝Zn+2FeO·SiO2+CO2，2FeO+SiO2＝2FeO·SiO2，CaO+SiO2＝CaO·SiO2，2CaO+SiO2＝2CaO·SiO2So as to obtain crude lead and further recover lead, wherein the main components of fly ash are CaO and CaSO4、SiO2、Al2O3MgO, which participates in slagging reactions as a slagging agent, such as: 2FeO + SiO2＝2FeO·SiO2，2PbO+SiO2＝2PbO·SiO2，2CaO+SiO2＝2CaO·SiO2，ZnO+Fe2O3＝ZnO·Fe2O3，CaO+Al2O3＝CaO·Al2O3Etc. to thereby obtain a composition containing ZnO. Fe2O3、2ZnO.SiO2、2CaO·SiO2、3CaO·SiO2、CaO·Al2O3、2MgO·SiO2、CaO·Al2O3And the like, a small amount of heavy metals such as Pb, Cd, Hg, Cr, Cu, Zn and the like in the fly ash can be regarded as part of the oxidation slag to generate corresponding chemical reaction, and dioxin in the fly ash is decomposed at high temperature, and the smoke dust obtained in the process is returned to the ingredients for recycling.
The inventor finds that the waste incineration fly ash is used as the flux in the reduction process of the oxidation furnace slag, so that the flux cost in the lead smelting process can be obviously reduced, the cost for separately treating the fly ash can be saved, dioxin in the waste incineration fly ash can be fully decomposed in the reduction treatment process, and heavy metals in the fly ash can be effectively recovered, so that not only can harmful substances be effectively treated, but also the serious waste of resources caused by adopting landfill in the past can be avoided, the resource and harmless treatment of the waste incineration fly ash can be realized, and great economic benefit and social benefit can be achieved.
According to an embodiment of the present invention, the temperature of the reduction treatment in this step is not particularly limited, and may be selected by those skilled in the art according to actual needs, and according to a specific embodiment of the present invention, the temperature of the reduction treatment may be not lower than 1000 ℃. Therefore, the lead reduction efficiency can be obviously improved, the lead recovery rate is improved, and the complete decomposition of dioxin in the fly ash can be ensured.
S400: feeding the zinc-containing slag into a fuming furnace for fuming
According to an embodiment of the invention, the zinc-containing slag is fed to a fuming furnace for fuming treatment, so as to obtain zinc oxide fume and harmless slag. In the step, specifically, zinc is reduced in the step and enters the flue in the form of zinc vapor, and is oxidized in the flue to exist in zinc oxide smoke dust in the form of oxide, and zinc can be further recovered. Other elements which do not enter the smoke enter the slag and exist in the form of molten glass, and the slag is harmless and can be used as building materials.
According to an embodiment of the present invention, the temperature of the fuming treatment in this step is not particularly limited, and may be selected by those skilled in the art according to actual needs, and according to a specific embodiment of the present invention, the temperature of the fuming treatment may be not lower than 1000 ℃. This can significantly improve the recovery rate of zinc.
According to still another embodiment of the present invention, the oxidation furnace, the reduction furnace and the fuming furnace may be independently a top-blown furnace, a side-blown furnace or a bottom-blown furnace, respectively.
According to the method for treating the waste incineration fly ash provided by the embodiment of the invention, the lead-containing raw material is supplied to the oxidation furnace for oxidation smelting treatment, and then the waste incineration fly ash is used as the flux in the reduction smelting process of the oxidation furnace slag, so that the cost of the flux in the lead smelting process can be obviously reduced, the cost for separately treating the fly ash can be saved, dioxin in the waste incineration fly ash can be fully decomposed in the reduction smelting treatment process, and the heavy metals in the fly ash can be effectively recovered, so that not only can harmful substances be effectively treated, but also the serious waste of resources caused by adopting landfill in the past can be avoided, the resource and harmless treatment of the waste incineration fly ash can be realized, and great economic benefits and social benefits are achieved.
Referring to fig. 2, the method of treating waste incineration fly ash according to an embodiment of the present invention further includes:
s500: sending the flue gas containing low-concentration SO2 to a tail gas desulfurization system
In this step, the flue gas containing low concentration SO2 obtained in step S300 is sent to a tail gas desulfurization system. Therefore, S in the waste incineration fly ash and S-containing flue gas generated in the lead smelting reduction process are subjected to desulfurization treatment together, so that the environmental pollution of S is avoided.
As described above, the method of treating waste incineration fly ash according to an embodiment of the present invention may have at least one of the following advantages selected from:
according to the invention, by utilizing the complexity and diversity of the lead smelting raw materials, the heavy metals contained in the fly ash are all in the lead raw materials, so that the heavy metals are not a problem in lead smelting, Pb, Cu, Zn and the like in the fly ash are recycled, Ca, Si, Al, Mg and the like in the fly ash are not a problem, limestone, quartz stone and the like are replaced as a solvent, and the heavy metals are finally introduced into fuming furnace slag basically by 2FeO2、3CaO.SiO2、2MgO.SiO2、Al2O3.SiO2And the like, and can be used as building materials. Therefore, the invention not only solves the environmental protection problem of the incineration fly ash, but also reduces the cost of lead smelting.
The invention directly utilizes the existing mature lead smelting system to carry out harmless and resource treatment on the garbage fly ash, can realize effective treatment on the garbage fly ash, does not need to build special equipment, greatly reduces the cost, recovers Pb, Zn and S in the fly ash, and makes Ca, Al and Mg enter the furnace slag, thereby not only effectively treating harmful substances, but also fully utilizing resources.
The invention can reduce the cost of lead smelting other flux by using the waste incineration fly ash as the flux of the oxidation slag, and simultaneously saves the cost of separate disposal of the fly ash.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Examples
The lead-containing raw material is subjected to oxidation smelting treatment in an oxidation furnace (the furnace type can be a bottom blowing furnace, a top blowing furnace or a side blowing furnace), the temperature of the oxidation smelting treatment is controlled to be 1000-1100 ℃, and S is basically SO2The flue gas containing high concentration SO2 is sent to a sulfuric acid system for acid preparation; most of Pb and Cu are in crude lead, and a small part of Pb and Cu are in oxidation slag and lead-containing smoke dust, and the smoke dust is in closed cycle; zn, Ca, Mg, Al and the like enter into oxidation furnace slag, then mixed particles obtained by mixing and granulating the oxidation furnace slag, waste incineration fly ash and coal required by lead reduction and smelting are supplied into a reduction furnace for reduction smelting treatment, the furnace type of the reduction furnace can be a bottom blowing furnace, a top blowing furnace or a side blowing furnace, the mass of the waste incineration fly ash accounts for 1-5 wt% of the oxidation furnace slag, the reduction temperature is controlled at 1200-1300 ℃, dioxin in the fly ash is decomposed at high temperature to obtain crude lead, zinc-containing furnace slag and low-concentration SO-contained slag2Flue gas, then the obtained zinc-containing slag is supplied to a fuming furnace, finally Zn enters zinc oxide smoke dust which can be used as a zinc smelting raw material, Ca, Mg, Al and the like enter final slag, and the final slag is molten glass body, is harmless slag and can be usedAs a building material.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. A method for treating fly ash from waste incineration, comprising:
(1) the lead-containing raw material is fed into an oxidation furnace for oxidation smelting treatment SO as to obtain the lead-containing raw material containing high-concentration SO2Flue gas, lead bullion and oxidation furnace slag;
(2) mixing and granulating the waste incineration fly ash coal so as to obtain mixed granules;
(3) feeding the oxide slag and the mixed granules into a reduction furnace for reduction smelting treatment SO as to obtain crude lead, zinc-containing slag and low-concentration SO2Flue gas; and
(4) feeding the zinc-containing slag into a fuming furnace for fuming treatment so as to obtain zinc oxide smoke and harmless slag,
wherein,
in the step (1), the lead-containing raw material is at least one selected from lead concentrate, lead plaster and lead silver slag,
in the step (3), the mass ratio of the waste incineration fly ash to the oxidation furnace slag is (1-5): 100.
2. the method of claim 1, wherein the temperatures of the oxidation smelting process, the reduction smelting process, and the fuming process are each independently not less than 1000 degrees celsius.
3. The method of claim 1, further comprising:
(5) the low concentration of SO2The flue gas is sent to a tail gas desulfurization system.
4. The method according to claim 1, wherein the oxidation furnace, the reduction furnace and the fuming furnace are each independently a top-blown furnace, a side-blown furnace or a bottom-blown furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610529278.7A CN106048237B (en) | 2016-07-06 | 2016-07-06 | The method for handling incineration of refuse flyash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610529278.7A CN106048237B (en) | 2016-07-06 | 2016-07-06 | The method for handling incineration of refuse flyash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106048237A CN106048237A (en) | 2016-10-26 |
| CN106048237B true CN106048237B (en) | 2018-05-11 |
Family
ID=57202091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610529278.7A Active CN106048237B (en) | 2016-07-06 | 2016-07-06 | The method for handling incineration of refuse flyash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106048237B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734051B (en) * | 2016-11-21 | 2019-10-08 | 郴州市金贵银业股份有限公司 | The processing method of CRT flint glass |
| CN108486387A (en) * | 2018-04-16 | 2018-09-04 | 广东环境保护工程职业学院 | A kind of lead smelts method and the application for the treatment of incinerated fly ash of domestic garbage with cooperation |
| CN108517418A (en) * | 2018-04-16 | 2018-09-11 | 广东环境保护工程职业学院 | A kind of method of Copper making treating incinerated fly ash of domestic garbage with cooperation and application |
| CN108486389A (en) * | 2018-04-16 | 2018-09-04 | 广东环境保护工程职业学院 | A kind of tin smelts method and the application for the treatment of incinerated fly ash of domestic garbage with cooperation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268557A (en) * | 2011-08-02 | 2011-12-07 | 云南锡业集团（控股）有限责任公司 | One-step oxidizing smelting, retailoring and slag fuming volatilization method for lead sulphide concentrate |
| CN102634674A (en) * | 2012-04-27 | 2012-08-15 | 湖南华信有色金属有限公司 | Oxygen bottom-blowing smelting and liquid-state high-lead slag side-blowing direct reduction process |
| CN104263965A (en) * | 2014-10-11 | 2015-01-07 | 中南大学 | Method for recovering gold and lead by smelting refractory gold ore and lead-containing waste residue raw materials through oxygen enrichment molten pool |
| CN105671314A (en) * | 2016-04-20 | 2016-06-15 | 长沙有色冶金设计研究院有限公司 | Direct smelting method and system for producing metallic lead and zinc at the same time |
-
2016
- 2016-07-06 CN CN201610529278.7A patent/CN106048237B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268557A (en) * | 2011-08-02 | 2011-12-07 | 云南锡业集团（控股）有限责任公司 | One-step oxidizing smelting, retailoring and slag fuming volatilization method for lead sulphide concentrate |
| CN102634674A (en) * | 2012-04-27 | 2012-08-15 | 湖南华信有色金属有限公司 | Oxygen bottom-blowing smelting and liquid-state high-lead slag side-blowing direct reduction process |
| CN104263965A (en) * | 2014-10-11 | 2015-01-07 | 中南大学 | Method for recovering gold and lead by smelting refractory gold ore and lead-containing waste residue raw materials through oxygen enrichment molten pool |
| CN105671314A (en) * | 2016-04-20 | 2016-06-15 | 长沙有色冶金设计研究院有限公司 | Direct smelting method and system for producing metallic lead and zinc at the same time |
Non-Patent Citations (1)
| Title |
|---|
| 城市生活垃圾与煤混烧灰渣与熔融特性及成分分析;胡建杭 等;《环境科学学报》;20030731;第23卷(第4期);540-545 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106048237A (en) | 2016-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106048248B (en) | The method for handling incineration of refuse flyash | |
| CN102965510B (en) | Reduction sulfur-fixing bath smelting method and device of low-sulfur lead-containing secondary material and iron-rich heavy metal solid waste | |
| CN106048237B (en) | The method for handling incineration of refuse flyash | |
| CN103320617B (en) | Technology for cleanly and harmlessly processing high-calcium waste residue and high-iron waste residue | |
| CN102433448A (en) | Smelting method of antimony-zinc-lead-containing concentrate | |
| CN102965509A (en) | Method and device for treating daub and iron-rich heavy metal solid waste of waste lead-acid storage battery | |
| CN104313328B (en) | Lead and the method for gold is reclaimed based on difficult-treating gold mine sulfur melting bath melting solid with the reduction of lead containing sludge raw material | |
| CN112795776B (en) | Method for co-processing waste incineration fly ash and copper-containing sludge | |
| CN104278162A (en) | Method of selectively smelting antimony-lead-containing complex materials in smelting tank | |
| CN110923455B (en) | Crude copper converting process | |
| CN111893310A (en) | Harmless recycling treatment method for solid hazardous waste | |
| CN106734051B (en) | The processing method of CRT flint glass | |
| CN103882243A (en) | Clean production balanced lead making technology | |
| CN106048249B (en) | The method for handling incineration of refuse flyash | |
| CN108517418A (en) | A kind of method of Copper making treating incinerated fly ash of domestic garbage with cooperation and application | |
| CN107191943A (en) | Incineration disposal draff processing method | |
| CN111961861B (en) | Electroplating sludge resource utilization method | |
| CN103397214A (en) | Low-carbon treatment method of ardealite in pyrometallurgy of nonferrous metal | |
| CN108486387A (en) | A kind of lead smelts method and the application for the treatment of incinerated fly ash of domestic garbage with cooperation | |
| CN113860365B (en) | Method for treating arsenic-containing gypsum slag by using tin-smelting fuming furnace | |
| CN111809058B (en) | Method for one-step volatilization reduction treatment of smelting tailings | |
| CN114438323B (en) | Environment-friendly harmless treatment method for iron slag, cobalt slag, lead slag and sulfur tailings | |
| CN112143908B (en) | Smelting process for treating complex gold ore | |
| CN108118158A (en) | The method that valuable metal is extracted from vulcanized slag and blast furnace dust | |
| CN113774227A (en) | Smelting treatment method of incineration fly ash |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |