CN114292969A - Method for co-processing waste incineration fly ash by blast furnace ironmaking - Google Patents
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- 239000010881 fly ash Substances 0.000 title claims abstract description 93
- 238000004056 waste incineration Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012545 processing Methods 0.000 title description 4
- 238000005406 washing Methods 0.000 claims abstract description 35
- 239000012065 filter cake Substances 0.000 claims abstract description 27
- 239000000706 filtrate Substances 0.000 claims abstract description 25
- 238000006298 dechlorination reaction Methods 0.000 claims abstract description 20
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims abstract description 19
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 230000008020 evaporation Effects 0.000 claims abstract description 18
- 239000002244 precipitate Substances 0.000 claims abstract description 18
- 238000001556 precipitation Methods 0.000 claims abstract description 16
- 239000002738 chelating agent Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 3
- 230000002195 synergetic effect Effects 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000011085 pressure filtration Methods 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910052801 chlorine Inorganic materials 0.000 description 11
- 239000002893 slag Substances 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 229910052700 potassium Inorganic materials 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical group O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000010813 municipal solid waste Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000010794 food waste Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
The invention discloses a method for cooperatively treating waste incineration fly ash by blast furnace ironmaking, belonging to the technical field of waste incineration fly ash treatment and comprising the following steps of: step one, washing with water for dechlorination: feeding the waste incineration fly ash into a washing dechlorination system for dechlorination, wherein three-level countercurrent washing is adopted in the washing to obtain primary precipitate and primary filtrate; step two, impurity removal: adding a heavy metal chelating agent into the primary filtrate to remove impurities, and then filtering to obtain secondary precipitate and secondary filtrate; thirdly, merging the primary precipitation and the secondary precipitation, performing filter pressing to obtain a fly ash filter cake, performing evaporation salt separation on the secondary filtrate, performing multiple-effect evaporation on the evaporation salt separation, and fourthly, drying: the fly ash filter cake is dried by a hot-blast stove and then added into an iron-making blast furnace to complete the comprehensive utilization of the waste incineration fly ash, and the method has mature and simple working procedures.
Description
Technical Field
The invention belongs to the technical field of waste incineration fly ash treatment, and particularly relates to a method for co-processing waste incineration fly ash by blast furnace ironmaking.
Background
The fly ash is a powder substance which is collected in a flue gas pipeline, a flue gas purification, a separator, a dust removal device and the like in the waste incineration process and has light volume weight and fine particle size. The fly ash has complex components and is related to various factors such as garbage components, incinerator types, flue gas purification processes and the like. The fly ash mainly comprises Ca, Cl, Na, K and Si, wherein the Ca is mainly derived from deacidified excess lime, and the Cl is mainly derived from chlorine-containing plastics and food waste. The fly ash contains high content of CaO (40-50%), Cl (3-30%), Na (1-10%), K (0.5-10%) and SiO22-8% of MgO, 0.5-5% of Al2O3About 0.1-3% by weight of Fe2O3The proportion is about 0.1-2%.
Blast furnace iron making is a process of reducing solid iron oxides to liquid molten iron at high temperature. In order to produce high-quality molten iron with a high and stable yield in a blast furnace, a proper slag formation process is required, i.e., good properties of the liquid slag formed after the gangue in the iron ore, the ash in the fuel and the components in the flux are melted. On the premise of ensuring the low-temperature pulverization property, the drum strength and the reducibility of the sinter, the SiO in the sinter is reduced as much as possible2MgO and CaO slag forming substance content can obviously improve the reducibility and air permeability of the sintered ore at the high temperature of over 1000 ℃, but because the blast furnace desulfurization requires to maintain certain slag amount and slag components, a certain amount of SiO needs to be additionally supplemented2MgO and CaO slag-forming substances.
The existing disposal approaches of the fly ash comprise landfill, high-temperature melting, high-temperature sintering, cement kiln cooperative disposal and the like, the disposal approaches are not healthy and environment-friendly enough, and part of the disposal approaches have requirements on the chlorine content of the fly ash, so that the pollution problem cannot be thoroughly solved.
Disclosure of Invention
The invention aims to provide a method for utilizing blast furnace iron-making to cooperatively dispose waste incineration fly ash, which combines the waste incineration fly ash with a blast furnace iron-making process, utilizes the chemical reaction of the waste incineration fly ash and various raw materials in an iron-making blast furnace to realize the decomposition of dioxin in the waste incineration fly ash and the comprehensive utilization of the fly ash, and has important significance for environmental protection.
The purpose of the invention can be realized by the following technical scheme:
a method for utilizing blast furnace ironmaking to cooperate with disposing of waste incineration fly ash comprises the following steps:
step one, washing with water for dechlorination: feeding the waste incineration fly ash into a washing dechlorination system for dechlorination, washing Cl, K and Na in main components of the fly ash with water to remove, and washing with three-stage countercurrent washing to obtain primary precipitate and primary filtrate;
step two, impurity removal: adding a heavy metal chelating agent into the primary filtrate for impurity removal, removing impurities from the heavy metal through the filtrate to generate a precipitate, and then filtering to obtain a secondary precipitate and a secondary filtrate;
thirdly, merging the primary precipitation and the secondary precipitation, performing filter pressing to obtain a fly ash filter cake, and performing evaporation salt separation on the secondary filtrate, wherein the evaporation salt separation adopts multiple-effect evaporation;
step four, drying: and drying the fly ash filter cake by using a hot-blast stove, and then adding the fly ash filter cake into an iron-making blast furnace to finish the comprehensive utilization of the waste incineration fly ash.
Further, the liquid-solid ratio in the dechlorination process of water washing is 3-5mL/g, and after the water washing is finished, the centrifugal dehydration is carried out for 5-10min at the rotating speed of 3000r/min, so as to obtain primary precipitate.
Furthermore, the dosage of the heavy metal chelating agent is 0.8-2% of the mass of the waste incineration fly ash.
Further, the heavy metal chelating agent is a heavy metal chelating agent comprising sodium hydroxide, sodium carbonate and diatomite according to a mass ratio of 1: 1: 2, mixing the components.
And further, the primary precipitation and the secondary precipitation are combined and then are subjected to pressure filtration by a membrane filter press, and the water content of a filter cake is 39.5-40.5%.
Furthermore, the fly ash filter cake is dried and then added into the iron-making blast furnace to be used as a slag former, meanwhile, harmful components in the fly ash, heavy metals are solidified at high temperature, dioxin is thoroughly decomposed, and the like, so that the aim of harmless recycling of the fly ash is fulfilled.
The invention has the beneficial effects that:
because the iron ore and the sinter contain SiO impurity2And S and the like, so that a certain amount of slag former is required to be added when the slag former enters a blast furnace for iron making, and the conventional slag former comprises limestone, serpentine and the like. The fly ash filter cake after refuse incineration is dried, and the main component of the fly ash filter cake is CaO and also contains a small amount of SiO2、MgO、Al2O3The waste incineration fly ash, the sintering ash and the blast furnace ash are dechlorinated, demetallized and ball-milled and then are added into an iron-making blast furnace as a slagging agent, and on the one hand, the slagging agent is mixed with SiO in the sintering ore2Reacting to produce calcium silicate, and removing SiO impurity from the sintered ore2Removal, reaction is as follows: CaO + SiO2→CaSiO3(ii) a On the other hand, the catalyst can be used as an active agent to promote the removal of the impurity S in the sinter. And dioxin in the waste incineration fly ash filter cake is decomposed at high temperature to complete the detoxification process, heavy metals and trace chlorine elements generated after the decomposition of the dioxin are volatilized into blast furnace dust, and the blast furnace dust and other steel dust sludge can be treated in a rotary kiln to be rich in iron and extract zinc, so that the resource utilization is realized. The invention can dispose the waste incineration fly ash of dangerous waste in a blast furnace ironmaking process in a synergic manner, so that the waste incineration fly ash is utilized in a full resource manner, the working procedures are mature and simple, the crushing and ball milling working procedures of the waste incineration fly ash are reduced compared with the conventional slagging agent, and the waste incineration fly ash can be dried and then directly enters the blast furnace in a mode of blowing from a seal.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the method for co-disposing waste incineration fly ash by blast furnace ironmaking according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to FIG. 1, the fly ash from the incineration plant of the domestic garbage of Changsha city is used as one of the raw materials, and the fly ash contains 18.95 wt% of Cl, 0.52 wt% of Zn, 0.21 wt% of Pb, 0.11 wt% of Sn, 0.10 wt% of Cu, and 0.09 wt% of Cr.
Step one, washing with water for dechlorination: feeding the waste incineration fly ash of the plant into a washing dechlorination system for dechlorination, washing Cl, K and Na in main components of the fly ash by three-stage countercurrent washing, wherein the solid-to-liquid ratio of the washing is 3mL/g, and dewatering for 5min in a centrifugal mode at a rotating speed of 3000r/min after the washing is finished to obtain primary precipitate;
step two, impurity removal: adding a heavy metal chelating agent into the primary filtrate for impurity removal, removing impurities from the heavy metal through the filtrate to generate a precipitate, and then filtering to obtain a secondary precipitate and a secondary filtrate;
thirdly, merging the primary precipitation and the secondary precipitation, and then performing filter pressing by using a diaphragm filter press to obtain a fly ash filter cake, wherein the water content of the fly ash filter cake is 39.5%, performing evaporation salt separation on the secondary filtrate, and performing multi-effect evaporation for the evaporation salt separation;
step four, drying: the fly ash filter cake is dried by a hot-blast stove and then added into an iron-making blast furnace to finish the comprehensive utilization of the waste incineration fly ash, and the fly ash filter cake can be added from the top of the blast furnace in a block form or can be sprayed from a tuyere in a powder form.
Wherein the heavy metal chelating agent is sodium hydroxide, sodium carbonate and diatomite according to a mass ratio of 1: 1: 2, the dosage of the fly ash is 0.8 percent of the mass of the waste incineration fly ash.
Example 2
Referring to FIG. 1, the fly ash from the incineration plant of the domestic garbage of Changsha city is used as one of the raw materials, and the fly ash contains 18.95 wt% of Cl, 0.52 wt% of Zn, 0.21 wt% of Pb, 0.11 wt% of Sn, 0.10 wt% of Cu, and 0.09 wt% of Cr.
Step one, washing with water for dechlorination: feeding the waste incineration fly ash of the plant into a washing dechlorination system for dechlorination, washing Cl, K and Na in main components of the fly ash by three-stage countercurrent washing, wherein the solid-to-liquid ratio of the washing is 4mL/g, and dewatering for 8min in a centrifugal mode at a rotating speed of 3000r/min after the washing is finished to obtain primary precipitate;
step two, impurity removal: adding a heavy metal chelating agent into the primary filtrate for impurity removal, removing impurities from the heavy metal through the filtrate to generate a precipitate, and then filtering to obtain a secondary precipitate and a secondary filtrate;
thirdly, merging the primary precipitation and the secondary precipitation, and then performing filter pressing by using a diaphragm filter press to obtain a fly ash filter cake, wherein the water content of the fly ash filter cake is 39.8%, performing evaporation salt separation on the secondary filtrate, and performing multi-effect evaporation for the evaporation salt separation;
step four, drying: the fly ash filter cake is dried by a hot-blast stove and then added into an iron-making blast furnace to finish the comprehensive utilization of the waste incineration fly ash, and the fly ash filter cake can be added from the top of the blast furnace in a block form or can be sprayed from a tuyere in a powder form.
Wherein the heavy metal chelating agent is sodium hydroxide, sodium carbonate and diatomite according to a mass ratio of 1: 1: 2, the dosage of the fly ash is 1 percent of the mass of the waste incineration fly ash.
Example 3
Referring to FIG. 1, the fly ash from the incineration plant of the domestic garbage of Changsha city is used as one of the raw materials, and the fly ash contains 18.95 wt% of Cl, 0.52 wt% of Zn, 0.21 wt% of Pb, 0.11 wt% of Sn, 0.10 wt% of Cu, and 0.09 wt% of Cr.
Step one, washing with water for dechlorination: feeding the waste incineration fly ash of the plant into a washing dechlorination system for dechlorination, washing Cl, K and Na in main components of the fly ash by three-stage countercurrent washing, wherein the solid-to-liquid ratio of the washing is 5mL/g, and centrifugally dewatering for 10min at the rotating speed of 3000r/min after the washing is finished to obtain primary precipitate;
step two, impurity removal: adding a heavy metal chelating agent into the primary filtrate for impurity removal, removing impurities from the heavy metal through the filtrate to generate a precipitate, and then filtering to obtain a secondary precipitate and a secondary filtrate;
thirdly, merging the primary precipitation and the secondary precipitation, and then performing filter pressing by using a diaphragm filter press to obtain a fly ash filter cake, wherein the water content of the fly ash filter cake is 40.5%, performing evaporation salt separation on the secondary filtrate, and performing multi-effect evaporation for the evaporation salt separation;
step four, drying: the fly ash filter cake is dried by a hot-blast stove and then added into an iron-making blast furnace to finish the comprehensive utilization of the waste incineration fly ash, and the fly ash filter cake can be added from the top of the blast furnace in a block form or can be sprayed from a tuyere in a powder form.
Wherein the heavy metal chelating agent is sodium hydroxide, sodium carbonate and diatomite according to a mass ratio of 1: 1: 2, the dosage of the fly ash is 2 percent of the mass of the waste incineration fly ash.
The chlorine content of the dried fly ash filter cake obtained in the fourth step of examples 1 to 3 was measured, and the test results are shown in table 1:
TABLE 1
| Item | Chlorine content (%) |
| Example 1 | 0.86 |
| Example 2 | 0.82 |
| Example 3 | 0.85 |
It can be seen from the contents of table 1 and examples 1-3 that the method for co-processing waste incineration fly ash by blast furnace ironmaking according to the present invention not only removes high chlorine in the waste incineration fly ash, but also realizes the comprehensive utilization of the waste incineration fly ash, and the process is mature and simple, the crushing and ball milling processes of the waste incineration fly ash are reduced compared with the conventional slag former, and the waste incineration fly ash can be directly fed into the blast furnace through the mode of blowing from the seal after being dried.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for utilizing blast furnace ironmaking to dispose waste incineration fly ash in a synergic manner is characterized by comprising the following steps:
step one, washing with water for dechlorination: feeding the waste incineration fly ash into a washing dechlorination system for dechlorination, wherein three-level countercurrent washing is adopted in the washing to obtain primary precipitate and primary filtrate;
step two, impurity removal: adding a heavy metal chelating agent into the primary filtrate to remove impurities, and then filtering to obtain secondary precipitate and secondary filtrate;
thirdly, merging the primary precipitation and the secondary precipitation, performing filter pressing to obtain a fly ash filter cake, and performing evaporation salt separation on the secondary filtrate, wherein the evaporation salt separation adopts multiple-effect evaporation;
step four, drying: and drying the fly ash filter cake by using a hot-blast stove, and then adding the fly ash filter cake into an iron-making blast furnace to finish the comprehensive utilization of the waste incineration fly ash.
2. The method for co-disposing waste incineration fly ash through blast furnace ironmaking according to claim 1, wherein a liquid-solid ratio in a washing dechlorination process is 3-5mL/g, and after washing, centrifugal dehydration is performed for 5-10min at a rotating speed of 3000r/min to obtain primary precipitate.
3. The method for the synergistic treatment of the waste incineration fly ash by using blast furnace ironmaking according to claim 1, wherein the heavy metal chelating agent is prepared from sodium hydroxide, sodium carbonate and diatomite according to a mass ratio of 1: 1: 2, mixing the components.
4. The method for co-disposing waste incineration fly ash through blast furnace ironmaking according to claim 1, wherein the amount of the heavy metal chelating agent is 0.8-2% of the mass of the waste incineration fly ash.
5. The method for co-disposing waste incineration fly ash through blast furnace ironmaking according to claim 1, characterized in that the primary precipitation and the secondary precipitation are combined and then subjected to pressure filtration by a membrane filter press.
6. The method for co-disposing waste incineration fly ash through blast furnace ironmaking according to claim 1, wherein the water content of the fly ash filter cake is 39.5-40.5%.
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| CN115259761A (en) * | 2022-08-10 | 2022-11-01 | 浙江方远新材料股份有限公司 | Process for manufacturing baking-free bricks by using waste incineration fly ash |
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