CN111777345A

CN111777345A - Method for co-processing waste incineration fly ash by using cement kiln

Info

Publication number: CN111777345A
Application number: CN202010691862.9A
Authority: CN
Inventors: 尹小林; 宋剑飞
Original assignee: Changsha Zichen Technology Development Co Ltd
Current assignee: Changsha Zichen Technology Development Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-10-16
Anticipated expiration: 2040-07-17
Also published as: CN111777345B

Abstract

A method for co-processing waste incineration fly ash by a cement kiln comprises the steps of modifying the waste incineration fly ash, and sending the modified waste incineration fly ash serving as a combustion-supporting component for clinker sintering in a dry cement production line into a normally-running dry cement production line system for co-processing from a discharge pipeline on the cone part of a preheater or an upstream air pipe of the preheater. The invention has extremely low energy consumption, low treatment cost, no secondary pollution and easy popularization and application; the waste incineration fly ash is modified and treated to be used as a sintering aid for dry cement production, so that the sintering easiness of clinker is improved, the early strength of the clinker is improved, and the energy conservation and emission reduction are facilitated.

Description

Method for co-processing waste incineration fly ash by using cement kiln

Technical Field

The invention relates to a method for disposing waste incineration fly ash, in particular to a method for disposing waste incineration fly ash by using a cement kiln in a coordinated manner.

Background

At present, the fly ash from the incineration of garbage, which is one of the problems in environmental protection treatment of domestic garbage incineration power plants, is the residue collected in the flue gas purification system, and contains the fly ash from dust collectors and the fly ash from absorption towers or the sewage and sludge from washing towers, and the fly ash contains flue dust, added chemical agents and chemical reaction products. Heavy metals such as Zn, Pb, Cu, Cr, Cd and Hg in the incineration fly ash have high concentration, especially under the condition that the current wet garbage is not well incinerated in a furnace, a part of heavy metals are reduced and evaporated by the reducing atmosphere caused by incomplete combustion in the furnace, all heavy metal substances with evaporation points lower than the incineration temperature can be evaporated and enter flue gas, the heavy metal substances in the flue gas are condensed into fine particles along with the reduction of the temperature of the flue gas and are condensed on smoke dust in the flue gas, and finally the fine particles are collected by flue gas dust removal equipment together to form the incineration fly ash. Therefore, the actual waste incineration fly ash is an irregular object formed by gathering particulate matters, reaction products, unreacted products and condensation products, the particle sizes of the particulate matters are different, the surface of the particulate matters is rough and polygonal, the particulate matters are mainly aggregates of microbead-shaped glass phase, cotton flocculent soft particles and small particles, the particle sizes are mainly distributed in the range of 4-100 mu m, the occupancy ratio is up to 71-95%, the porosity is high, the specific surface area is large, heavy metals such as Pb, Zn, Cd, Hg and Cr and a large amount of dioxin-like substances are condensed and enriched, the condensed particulate matters are generally light gray to gray black powder, the water content is mostly 10-29%, and the thermal ignition loss rate is up to 22-51%. At present, the waste incineration fly ash is defined as a two-material hazardous waste with heavy metal hazard characteristics and persistent organic toxicity hazard characteristics, has great hazard to human health and ecological environment, and belongs to hazardous solid waste.

The elements of the fly ash of the waste incineration power plant come from domestic waste and flue gas treatment additives, and are different with the difference of domestic waste sources, process methods and process control parameters. The elements in the fly ash mainly comprise Ca, Si, Cl, S, C, Al, K, Na, Fe, Mg, Pb and Zn, and the trace elements comprise Mn, Cu, Cd, Cr, Ni, Sb, Hg, Ag, Ti, As, Co, Ba and Bi. Typical elements of the waste fly ash (average value of 37 waste incineration power plant fly ash samples in China) are Ca 25.14%, Si 9.73%, Cl11.86%, S3.64%, K3.37%, Al 3.12%, Na 2.69%, Fe 2.36%, Mg 1.19%, C4.13%, Zn3.267%, Pb 1.493%, Mn617.8mg/kg, Cu 394.7Mg/kg, Cr 326.7Mg/kg, Ni 114.5Mg/kg, As167.1mg/kg, Sb 189.5Mg/kg, Ti 121.7Mg/kg, Cd 34.2Mg/kg, Ag 29.4Mg/kg, Hg 24.3Mg/kg and Co 0.00 Mg/kg.

The mineral composition of the incineration fly ash is complex, and the main minerals are quartz, silicate, carbonate, chloride and sulfate, including quartz SiO₂、Ca₃Si₂O₇、CaAl₂Si₂O₈、MgSiO₃、Ca₂Al₂SiO₇、Ca₂SiO₄·0.35H₂O、Ca₉Si₆O₂₁·H₂O、K₂Al₂Si₂O₈·3.8H₂O、Zn₂SiO₄、AlCl₃·4Al（OH）₃·4H₂O、CaCl₂、NaCl、KCl、MgCl₂、FeCl₃、AlCl₃、PbCl₂、 ZnCl₂、ZnSO₄、CaCO₃、CaSO₄、Cu₂CrO₄And a small amount of Fe₂O₃、Zn₂P₆S₆、PbO、PbCl₂O₄、CaO·MgO·Al₂O₃·SiO₂、（Fe，Mg，Al）Al₂Si₆O₂₂（OH）₂、Mg₇Fe₄O₁₃·10H₂O、Pb₂Fe₂O₅、Mg₂Al₆Ti₇O₂₅、Cu₄Al₂（SO₄）（OH）₁₂·2H₂O, and the like.

The fluctuation range of the main chemical components of the incineration fly ash is generally SiO₂9～26%、Al₂O₃3.1～7.5%、Fe₂O₃1.4～4.5%、CaO 27～42%、MgO 1.8～3.0%、SO₃3.0～12%、Cl^-5～20%、R₂O 2.5～12%、TiO₂0.45～0.85%、Loss 20～51%。

Although the chemical composition analysis of the incineration fly ash belongs to SiO_2-Al₂O_3-The metal oxide system, Ca, K, Na and Mg in the fly ash are also beneficial to the sintering temperature, but because the content of dissolved salts in the incineration fly ash is as high as 15% -22%, and mainly the existence of chloride, Pb, Zn and Hg, the cement solidification and landfill of the waste incineration fly ash are not beneficial, in addition, the content of aluminum in the incineration fly ash is lower, the melting vitrification treatment is not beneficial, and the conventional sintering or melting vitrification treatment causes part of the waste incineration fly ash to be partially treatedThe chlorine salt escapes the polluted environment along with the waste gas as chlorine-containing acidic compounds, and the Pb, Zn and Hg heavy metals in the chlorine salt escape the polluted environment along with the waste gas again.

Due to the above characteristics of fly ash from incineration of household garbage, fly ash from incineration of household garbage has been a dangerous solid waste which is extremely difficult to be properly treated in power plants from incineration of household garbage, and for a long time, a great deal of research and practice has been carried out by scientific and technological workers at home and abroad, and the technical scheme mainly focuses on stabilization treatment of fly ash.

The content of alkali metal chloride in the incineration fly ash of domestic garbage in Europe and America abroad is lower due to living habits, and the technical scheme focuses on converting fly ash into cement clinker minerals by doping fly ash ingredients into a cement kiln and calcining and preparing cement concrete aggregate or mixed material by using the incineration fly ash of the garbage; in China such as Japan and Korean, because the content of plastic substances in household garbage is high, the content of alkali metal chloride in incineration fly ash is high, the stability of a cement solidification method is extremely poor, the strength and the soaking durability of an obtained solidified body are poor, and the technical scheme mainly focuses on the aspect of resource utilization of high-temperature melting vitrification treatment.

The prior treatment method of the waste incineration fly ash in China can be summarized as follows:

(1) a safe landfill method: the method is called as the safest and reliable means for treating the fly ash from the current refuse incineration, and is also the fly ash treatment method commonly adopted by the current domestic refuse incineration power plants, namely, the fly ash from the refuse incineration is mixed and pretreated by an organic complex or an inorganic stabilizer and then sent into a safe landfill site which is subjected to asphalt felt anti-seepage treatment. However, the method needs continuous land filling, the construction and operation cost of the safe land filling field is not low, the safe land filling field is only safe and stable for a limited period of time, and toxic and harmful organic matters, heavy metal ions, mercury and the like in the waste incineration fly ash are not eliminated and are still transferred to pollute underground water and soil.

(2) Curing and burying method: the solidification landfill technical method promoted at present comprises cement solidification landfill, asphalt solidification landfill, landfill after melting solidification, landfill after chemical agent solidification, wherein in the melting solidification landfill method, although organic matters such as dioxin and the like can be digested and reduced in the heat treatment process, serious secondary pollution such as chlorine-containing acidic flue gas and mercury volatilization and diffusion and the like generally exists, the treatment investment and the cost are extremely high, the energy consumption is high, and meanwhile, the waste of resources is also caused; according to the method for treating the waste incineration fly ash by cement curing and landfill, asphalt curing and landfill and chemical agent curing, toxic and harmful organic matters, heavy metal ions, mercury and the like in the waste incineration fly ash are not eliminated, particularly, dioxin and dissolved salts have almost no stabilizing effect, the method is still a limited-period safe landfill treatment mode which is not seen as clean by eyes, and finally the toxic and harmful organic matters, the heavy metal ions, the mercury and the like in the fly ash can still migrate to pollute underground water and soil.

(3) Wet chemical treatment (resource extraction separation utilization method): namely, acid and alkali dissolution separation or microorganism and biological agent are adopted to extract and separate the heavy metals in the fly ash for resource utilization respectively. The enrichment degree of the heavy metals in the waste incineration fly ash is far less than the economic degree of the extraction of other waste residues rich in the heavy metals, namely, the technical method for extracting the heavy metals has the defects of serious secondary pollution of waste water and waste residues, and objective resource consumption and increment and expansion or diffusion of pollutants no matter the economy is not available.

(4) Phosphoric acid washing method: the method is helpful to improve the chemical stability of heavy metals in the fly ash and the thermal stability of the fly ash (generating phosphate sediment), but a large amount of organic matters and inorganic salts are still distributed in the fly ash and the phosphoric acid, thereby wasting limited phosphorus resources.

(5) Manufacturing building material products such as building blocks: at present, the method for making building material products by utilizing waste incineration fly ash as resources is to firstly stabilize the waste incineration fly ash, namely, the fly ash is stabilized by adopting fly ash pretreatment processes such as washing, crushing and the like, and then the fly ash is mixed with cement and aggregate to prepare cement concrete building blocks or bricksThe strength of the cement concrete building block or brick is low, the durability is poor, and simultaneously, the Fe in the cement cured building block or brick is influenced by excessive chloride ions²⁺、Cu²⁺、Zn²⁺、Pb²⁺、Cd²⁺The plasma is easy to leach out, which causes the pollutant to exceed the standard.

(6) Washing and drying as a cement production raw material or a concrete admixture: the method is to wash the waste incineration fly ash to remove most of soluble chloride and part of organic pollutants, dry the waste incineration fly ash and then put the waste incineration fly ash into a raw material mill, or wash a filter cake with water into the raw material mill as a raw material for cement raw material blending, or dry and grind the waste incineration fly ash into cement or commercial concrete blending material, so as to reduce the serious influence on the cement production and the strength and the volume stability and durability of the concrete, for example, the FWD washing desalination technology developed by Beijing Zhongkou Guohun environmental protection technology Co. However, in the first method, heavy metals and toxic organic matters adsorbed in the fine particles are difficult to effectively clean and remove, and certain organic pollutants such as heavy metals and dioxin are carried in kiln tail flue gas. And secondly, the sewage containing high salinity, heavy metal and organic matters is difficult to treat by washing, the washing membrane separation technology is similar to the 'one-liquid' membrane separation concentrated solution containing the extremely headache of a waste incineration plant, which is objectively dangerous waste liquid), the pollution is caused in the drying treatment process, and the drying energy consumption is not low. And thirdly, the processing cost is high.

On the other hand, the residue after the waste incineration fly ash is washed by water to remove most of soluble chloride and part of organic pollutants is dried or dried and ground, wherein the calcium aluminosilicate mineral is also a stable mineral, has no hydration activity and no potential hydraulic activity, is only equivalent to the alumino-silicate waste soil containing heavy metal and carbon organic matters, and is objectively a toxic and harmful filler when being used as a cement or commercial concrete admixture.

(7) And (2) performing a volcanic ash/agglomerated stone stabilizing method: the treatment method is similar to a pollutant transfer method in a visual sense, toxic and harmful organic matters, a large amount of soluble inorganic salts, heavy metal ions, mercury and the like in the waste incineration fly ash are not eliminated, and finally the toxic and harmful organic matters, the heavy metal ions, the mercury and the like in the fly ash can be transferred to pollute underground water and soil.

(8) The molten vitrification treatment method comprises the following steps: mixing the fly ash with crushed waste glass, pelletizing, melting at 1000 deg.c to form solidified glass, heating to 1400 deg.c, cooling to form slag, burying, or adding SiO in large proportion into fly ash₂、MgO、TiO₂The method has the advantages that the energy consumption and the cost are high on one hand, serious secondary pollution such as chlorine-containing acidic smoke exists on the other hand, strict subsequent smoke treatment needs to be carried out on volatile heavy metal elements such as Pb, Cd, Zn, Hg and the like, and the treatment investment and the cost are extremely high.

(9) Firing ceramsite method: for example, CN1830885 discloses a ceramsite prepared by mixing fly ash from waste incineration with clay, granulating, and calcining at l 000-1400 deg.C, wherein 20-80% of fly ash and 80-20% of clay are used as raw materials, and the mixture is subjected to mixing, granulating, and calcining at l 000-1400 deg.C to obtain the ceramsite product. The method has the advantages that the calcination temperature is high, the energy consumption and the cost are high, serious secondary pollution such as chlorine-containing acidic flue gas is generated, the volatile heavy metal elements such as Pb, Cd, Zn and Hg need to be subjected to strict subsequent flue gas treatment, and the treatment investment and the cost are high.

(10) A cement kiln co-processing method: the cement kiln cooperative disposal method mainly comprises a cement production raw material ingredient cooperative disposal method, a Japanese mortar spraying decomposing furnace method and a kiln head spraying burning method.

The cement production raw material ingredient synergic disposal method is characterized in that waste incineration fly ash is doped into raw material ingredients in dry cement production, the raw material powder is prepared by mixing and grinding, the homogenized raw material powder is sent into a C2 upstream air pipe of a dry cement production line preheater system, is gradually preheated and heated by an anoxic C1-C4 preheater, then is sent into a decomposing furnace, is collected by a C5 preheater and is sent into a rotary kiln to be calcined into clinker. TheThe method is simple and easy to implement, but once the temperature is gradually increased to 740-800 ℃ in the reducing atmosphere and then the kiln tail smoke enters the decomposing furnace, the kiln tail smoke contains a large amount of heavy metals and hydrocarbon volatile matters, and SO in the smoke₂The concentration rises; secondly, the volatilization of chlorine, alkali, sulfur and heavy metal and the gradual aggravated reduction effect cause the crusting of a preheater, a smoke chamber and the like, and influence the working condition of the kiln system. Namely, the method for cooperatively treating the waste incineration fly ash by the cement kiln cannot effectively fix heavy metals and chlor-alkali sulfur in the waste incineration fly ash, and influences the working condition and energy consumption.

The method of spraying mortar into a decomposing furnace in Japan is to prepare low-chlorine refuse incineration fly ash or refuse incineration fly ash from which chloride salts are eluted with water into slurry and then spray the slurry into the decomposing furnace for treatment. The method influences the combustion of fuel in the decomposing furnace, increases the heat consumption of clinker sintering, is easy to generate crust to influence the working condition of a kiln system, and increases the discharge amount of pollutants such as heavy metal, hydrocarbon and the like in smoke.

The kiln head spraying burning method is a synergistic treatment method of using compressed air to directly spray the refuse burning fly ash into the rotary kiln from the kiln head of the rotary kiln. The method can generate a large amount of chloric acid aerosol by chlorine in the fly ash, and can strengthen the crusting of the sulfur alkali and prevent the solid melting of the alkali besides causing the loosening and corrosion of refractory materials. Secondly, the chlorine in the fly ash is not effective in forming calcium chloroaluminate minerals. And then, the heavy metals such as mercury in the fly ash which are easy to reduce and volatilize migrate along with the hot gas flow through the decomposing furnace and the preheater, and finally escape in the humidifying tower and the flue gas to cause pollution diffusion.

Obviously, the existing various treatment methods of 'one solid' waste incineration fly ash are not satisfactory, so that the fly ash of a waste incineration power plant still has to be treated by a 'safe landfill method' under the condition that a landfill site is difficult to find, and the pollution of land resources is caused.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects in the prior art and provide a method for cooperatively treating waste incineration fly ash by using a cement kiln, which can utilize combustible substances and silicon-aluminum components in the waste incineration fly ash as resources, efficiently solidify heavy metals and chlor-alkali sulfur in the waste incineration fly ash and eliminate the influence of organic matters and chlor-alkali sulfur in the waste incineration fly ash on the working condition of the kiln system.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for co-processing waste incineration fly ash by a cement kiln comprises the steps of modifying the waste incineration fly ash, using the modified waste incineration fly ash as a combustion-supporting component for dry-process cement production line clinker sintering, and sending the modified waste incineration fly ash into a normally-running dry-process cement production line system from a preheater system C5 or C6 for co-processing.

Furthermore, the treatment amount of the waste incineration fly ash subjected to modification treatment is 0.1-5.0% of the mass of the raw materials of the dry cement production line, and preferably 0.3-3.0%.

Further, the modification treatment is to perform strong oxidation curing treatment on the waste incineration fly ash, namely adding a modification treatment agent into the waste incineration fly ash for mixing reaction in the processes of stirring, mixing, rolling, mixing or grinding and mixing.

Further, the addition amount of the modification treatment agent is 0.1-5.0%, preferably 0.3-3.0%, and more preferably 0.5-2% of the mass of the waste incineration fly ash.

Further, the modifying treatment agent is a strong oxidant or a mixture of the strong oxidant and at least one of silicon micro-gel and aluminum micro-gel.

Further, the mass ratio of the strong oxidant to the silicon micro-gel and the aluminum micro-gel in the modifying treatment agent is 1: 1-10; preferably 1: 3-8; more preferably 1: 4 to 6.

Further, the strong oxidant is at least one of chlorine dioxide, fluorosulfonic acid, fluoroantimonic acid and ferrate; the silicon micro-gel is at least one of silica gel powder, silica gel liquid, silica fume powder and water glass; the aluminum micro-gel is at least one of metaaluminate, activated alumina and aluminum hydroxide.

Further, when the modifying treatment agent is used for modifying, the strong oxidant is premixed with the silica micro-gel and the aluminum micro-gel or directly added into the waste incineration fly ash or added into the waste incineration fly ash step by step for use.

Further, at least one of lime, carbide slag, cement powder, slag powder, silicon powder, calcium carbonate powder, bentonite, attapulgite powder or liquid-solid substances containing hydrocarbon is added as an auxiliary material in the process of adding a modification treatment agent into the waste incineration fly ash for mixing reaction to carry out modification treatment; the doping amount of the auxiliary materials is 0.1-15% of the mass of the waste incineration fly ash.

Further, the dry method cement clinker production line preheater system comprises a five-stage cyclone preheater and a six-stage cyclone preheater, namely, the modified waste incineration fly ash is sent into the dry method cement production line system which normally operates from a discharge pipeline of a cone part of the C5 or C6 preheater which contains a large amount of high-temperature calcium oxide powder for cooperative treatment, or is sent into the dry method cement production line system which normally operates from an upstream pipe of the C5 or C6 preheater which is rich in calcium oxide micropowder for cooperative treatment.

The modified waste incineration fly ash is sent into a normally-running dry cement production line system from a discharge pipeline at the cone part of a C5 or C6 preheater containing a large amount of high-temperature calcium oxide powder for cooperative treatment, cold modified waste incineration fly ash fed from a discharge chute at the cone part of a C5 or C6 cyclone preheater is flushed into a kiln tail smoke chamber along with hot material powder containing a large amount of high-temperature calcium oxide powder and enters a rotary kiln for calcination in an oxidizing atmosphere, the waste incineration fly ash particles wrapped by strong-base high-temperature powder under the protection of a modification treatment agent quickly exceed the volatilization, cracking and reduction temperature (300-900 ℃) section of carbon organic matters in the waste incineration fly ash particles, the reduction volatilization of heavy metals and chlor-alkali sulfur is inhibited, and combustible matters such as carbon, dioxin organic matters and the like contained in the waste incineration fly ash particles in the quickly-preheated mixed raw material powder are quickly burnt out in the rotary kiln, inorganic mineral in the waste incineration fly ash particles is thermally decomposed into active oxides which are all components of raw materials, heavy metal ions are trapped and melted by high-activity aluminosilicate radical under the synergistic effect of the modification treatment agent, and chlorine and sulfur are trapped and melted by Cl in a non-reducing atmosphere in a rotary kiln^-、SO₃Combined with new high-activity CaO to be converted into calcium chloride and calcium sulfate to participate in calcium chloroaluminate and calcium sulfoaluminate reactions (calcium chloroaluminate minerals do not corrode reinforcing steel bars), and alkali metal ions are combined with high-activity alumino silicate groups to form siliconAluminate minerals (solid alkali calcium aluminosilicate minerals improve early strength but have a slight effect on later strength).

The modified garbage incineration fly ash fed from the upstream air pipe of the C5 cyclone preheater is quickly preheated and mixed with hot raw meal powder by the C4 cyclone preheater to form mixed raw meal powder, and the mixed raw meal powder is discharged into a decomposing furnace (takes about 8 seconds) to be suspended and smokeless to burn along with pulling air, namely, the modified garbage incineration fly ash is quickly heated to 680-800 ℃ from normal temperature and cold state in the environment of alkaline powder in the upstream air pipe and the C4 cyclone preheater of the anoxic C5 cyclone preheater, and quickly passes over the volatilization cracking reduction temperature (300-800 ℃) section of carbon organic matters in the garbage incineration fly ash particles under the protection of a modifying treatment agent, so that the reduction volatilization of heavy metals and chlor-alkali sulfur is inhibited, the quick heating only comes to obtain and remove internal water and combined water which inhibit the heating and the burning in the garbage incineration fly ash, and the organic carbon class in the garbage incineration fly ash particles is achieved, The temperature range (580-800 ℃) of the rapid oxidation combustion of the combustible materials such as sulfide and the like is higher than that of the cold fuel entering a decomposing furnace, the combustion performance of the combustible materials of the rapidly preheated (dehydrated and puffed) waste incineration fly ash particles suspended in the decomposing furnace along with the pulling wind is better than that of the cold fuel entering the decomposing furnace, organic matter combustible materials such as carbon, dioxin and the like contained in the waste incineration fly ash particles in the rapidly preheated mixed raw material powder are rapidly burnt out in the smokeless suspension combustion in the decomposing furnace, inorganic minerals in the waste incineration fly ash particles are thermally decomposed into active oxides which are all components of raw material components, heavy metal ions are trapped and dissolved by high-activity aluminosilicate root groups under the synergistic action of a modifying treatment agent, and chlorine and sulfur are trapped and dissolved by Cl and Al groups under the non-reducing atmosphere in^-、SO₃The compound is combined with new high-activity CaO and converted into calcium chloride and calcium sulfate to participate in the reaction of calcium chloroaluminate and calcium sulfoaluminate, and alkali metal ions are combined with high-activity alumino-silicate radicals (the early strength is improved but the later strength is slightly influenced).

The invention relates to a method for cooperatively treating waste incineration fly ash by a cement kiln, which directly solves the problems that carbon, organic matters, sulfide combustible substances, chlor-alkali sulfur and heavy metals in the waste incineration fly ash are gradually heated and volatilized in C1, C2, C3 and C4 grade preheaters of a multi-grade preheater, reductive decomposition is carried out, the reducibility and reducibility of raw materials are gradually increased, the reducing atmosphere in a decomposing furnace is further increased, the reduction skinning and sticking in the C5 grade preheater, a kiln tail smoke chamber, a throat and even a rotary kiln are further increased in a linkage manner, thereby further influencing the stability of kiln conditions of dry cement production, simultaneously solving the problem of difficult control of greatly increasing the concentration of heavy metal, hydrocarbon volatile matters and sulfur dioxide pollutants caused by the cooperative disposal of waste incineration fly ash, heavy metal and chlorine alkali sulfur in the waste incineration fly ash are effectively utilized to a certain extent to improve the easy burning property of the clinker and improve the early strength of the clinker.

The invention has the following beneficial effects: 1) The method is simple, the investment is low, the treatment energy consumption is extremely low, the treatment cost is low, no secondary pollution is caused, and the popularization and the application are easy; 2) The advantages of mature dry cement production line process equipment and the characteristics of aluminosilicate minerals are combined, carbon-containing organic matters and inorganic matters in the waste incineration fly ash are fully utilized as resources, all organic pollutants including dioxin are burnt out cleanly, heavy metals and alkali are fused in a silicon-aluminum radical group/silicate radical group/aluminate radical group crystal lattice, chlorine and sulfur are converted into early-strength calcium chloroaluminate and calcium sulfoaluminate clinker minerals, meanwhile, the waste incineration fly ash is modified and treated to serve as a sintering aid for dry cement production, the sintering easiness of clinker is improved, the early strength of the clinker is improved, and energy conservation and emission reduction are facilitated.

Detailed Description

The present invention will be further described with reference to the following examples.

The chemicals used in examples 1 to 5 of the present invention were obtained from conventional commercial sources unless otherwise specified.

The following examples of the present invention relate to criteria including: DB 37/T1939-2011 is used for solid wastes in cement production, GB 18597-2001-standard for controlling pollution of storage of dangerous wastes, Standard Corrosion differentiation of dangerous wastes (GB 5085.1-2007), Standard Leaching toxicity differentiation of dangerous wastes (GB 5085.3-2007), general rules of Standard differentiation of dangerous wastes (GB 5085.7), Standard content differentiation of toxic substances of Standard differentiation of dangerous wastes (GB 5085.6), Standard reactivity differentiation of hazardous wastes (GB 5085.5), Standard Specification of hazardous wastes differentiation (HJ/T298), and the content of clinker is mg/L through TCLP experiment detection of toxicity characteristic Leaching method.

Example 1

The embodiment is carried out on a cement production line with a pre-decomposition kiln drying method of a phi 4 × 60m and a five-stage cyclone preheater of a certain enterprise, when the cement production line is in normal production, a kiln tail smoke chamber, a necking, a kiln inner skin and a long ring are formed, the stability of the kiln condition is poor, about 10% of a glutinous rice dumpling yellow reducing material is mixed in clinker, the average yield of the clinker under the normal kiln condition is 2678t/d, the actual standard coal consumption of the clinker is 110.7kg/t, the fluctuation of the vertical rising weight of the clinker is 1160-g/L, the fluctuation of f-CaO is 0.5-1.2%, the fluctuation of the clinker strength is 24.6-32.4 MPa and 52.8-57.6 MPa at 3d, the fluctuation of the standard water demand is 22.5-27.5%, the fluctuation of the coagulation time is 104-137 min at the initial coagulation time, the final coagulation is 139-168 min, and chloride ions (Cl)^-) The content is 0.013%.

The waste incineration fly ash used in the embodiment is derived from waste incineration fly ash stored in a household waste incineration power plant, and the elemental analysis of the waste incineration fly ash is SiO₂9.06%、Al₂O₃4.04%、 Fe₂O₃1.50%、 CaO 37.98%、 MgO2.65%、 Cl 11.96%、SO₃4.80%、K₂O 2.69%、Na₂O 1.50%、C 4.33%、Zn 2.892%、Pb 1.578%、Mn607.4mg/kg、Cu 384.5mg/kg、Cr 306.4mg/kg、Ni 107.9mg/kg、As 160.5mg/kg、Sb179.6mg/kg、 Ti 123.7mg/kg、Cd 38.9mg/kg、 Ag 35.8mg/kg、Hg 27.9mg/kg、Co 0.01mg/kg。

The modifying agent used in this example uses a self-made strong oxidant potassium ferrate as a raw material.

The embodiment comprises the following steps: stirring and mixing the waste incineration fly ash with the humidity of 5-20% and a modification treatment agent according to the mass ratio of 100: 0.38 for reaction for 60min, so that volatile heavy metal particles such as mercury, lead, zinc, cadmium and the like adsorbed in the waste incineration fly ash are oxidized and converted into heavy metal ions, the heavy metal ions are preliminarily stabilized, volatile peculiar smell is removed, the heavy metal ions are used as combustion-supporting components for sintering clinker, and then the modified waste incineration fly ash is sent into a normally-operated dry cement production line system from a discharge pipeline of a cone part of a C5 preheater containing high-temperature calcium oxide powder for synergistic treatment.

The co-processing amount of the waste incineration fly ash is gradually increased to 3.5 percent of the mass of the raw materials entering the dry cement production line from 0.5 percent.

In order to track the fluctuation condition of the clinker quality, a round of clinker samples are taken every 2 hours.

The test is continuously operated for 72 hours, the kiln condition is obviously improved, the preheater, a kiln tail smoke chamber, a throat and the kiln are not obviously skinned and stuck, the kiln head is clear, no flying sand exists basically, the caking property of clinker is good, no reducing material exists, the fluctuation of the vertical lifting weight of the clinker is 1287-1386 g/L, the fluctuation of f-CaO is 0.3-0.9%, and the operation condition of a kiln system is normal. The kiln tail exhaust emission has no negative influence, and the environmental protection on-line flue gas monitoring shows SO₂The emission value and the denitration ammonia water consumption are equivalent.

The average standard coal consumption of 3 days per ton of clinker is reduced to 103.9kg/t, and the standard coal consumption of per ton of clinker is reduced by 6.8 kg/t.

The clinker yield in 3 days is 2794t/d averagely, and is improved by 96 t/d.

The intensity fluctuation of the clinker is 32.6-35.7 MPa in 3d compressive strength and 56.4-59.7 MPa in 28d compressive strength, the water requirement fluctuation of the standard consistency is 22.2-26.0%, the fluctuation of the setting time is 101-126 min in initial setting and 136-159 min in final setting, and all physical and mechanical performance indexes of the clinker are improved.

The material sample is cooked for 3 days, the detected content fluctuation of the chloride ions is 0.031-0.053%, and the detected content fluctuation is all lower than the standard that the chloride ions in the cement industry are less than 0.06%.

3-day detection of clinker sample TCLP experiment: chromium, lead, mercury, zinc and cadmium are all 0.00mg/kg, namely the lixiviant 2 is not detected, and heavy metals are completely and fixedly dissolved in the crystal lattice of the aluminosilicate mineral.

The production test shows that the method for treating the waste incineration fly ash by the cement kiln in a synergistic way, namely modifying the waste incineration fly ash to be used as a sintering aid for sintering the clinker is feasible, can effectively improve the kiln condition, reduce the heat consumption of sintering the clinker, save partial calcium and siliceous raw materials, improve the quality and the physical and mechanical properties of the clinker to a certain extent and have no negative influence on the emission of smoke.

Example 2

The method is carried out on a cement production line with a pre-decomposition kiln dry method of a kiln tail smoke chamber, a necking, a moderate crust and a long ring in a kiln in a certain enterprise of phi 4.2 × 64m, when the cement production line is in normal production, a kiln tail smoke chamber and a necking are formed in the kiln, the kiln is stable in kiln conditions, a small amount of Zongzi reducing materials are mixed in clinker, the average yield of the clinker under normal kiln conditions is 3189t/d, the actual standard coal consumption of the clinker is 108.5kg/t, the vertical rise weight fluctuation of the clinker is 1180-1340 g/L, the fluctuation of f-CaO is 0.5-1.2%, the fluctuation of the clinker strength is 25.6-32.8 MPa at 3d, the fluctuation of the clinker strength is 53.8-58.9 MPa at 28d, the water demand fluctuation of the standard consistency is 22-28%, the fluctuation of the coagulation time is 98-130 min at initial coagulation, the final coagulation is 135-168^-) The content is 0.017 percent.

The waste incineration fly ash used in the embodiment is derived from waste incineration fly ash stored in a household waste incineration power plant, and the elemental analysis of the waste incineration fly ash is SiO₂9.60%、Al₂O₃3.78%、Fe₂O₃1.72%、 CaO 39.05%、 MgO2.66%、Cl 17.81%、SO₃5.79%、K₂O 2.15%、Na₂O 1.12%、C 4.01%、Zn 1.983%、Pb 1.793%、Mn614.8mg/kg、Cu 396.7mg/kg、Cr 314.8mg/kg、Ni 113.7mg/kg、As 171.7mg/kg、Sb196.4mg/kg、Ti 125.8mg/kg、Cd 40.9mg/kg、 Ag 32.7mg/kg、Hg 30.9mg/kg、Co 0.00mg/kg。

The modifying agent used in this example uses a self-made strong oxidant potassium ferrate and commercially available sodium metaaluminate as raw materials, wherein the mass ratio of potassium ferrate to sodium metaaluminate is 27: 73.

The embodiment comprises the following steps: rolling and mixing wet (humidity of 10-23%) waste incineration fly ash and a modification treatment agent according to the mass ratio of 100: 2.2 for 30min, so that volatile heavy metal particles such as mercury, lead, zinc, cadmium and the like adsorbed in the waste incineration fly ash are oxidized and converted into heavy metal ions, the heavy metal ions are preliminarily stabilized, volatile peculiar smell is removed, the heavy metal ions are used as combustion-supporting components for clinker combustion, and then the modified waste incineration fly ash is sent into a normally-operated dry cement production line system from an upstream air pipe of a C5 preheater rich in calcium oxide micro powder for cooperative treatment.

The co-processing amount of the waste incineration fly ash is gradually increased to 3.0 percent from 0.5 percent of the mass of the raw materials entering the dry cement production line.

The test is continuously operated for 72 hours, the preheater, the kiln tail smoke chamber, the necking and the kiln are not obviously skinned and stuck, the kiln head is clear, no flying sand exists basically, the caking property of the clinker is good, no reducing material exists, the fluctuation of the vertical lifting weight of the clinker is 1287-1386 g/L, the fluctuation of f-CaO is 0.3-1.0%, and the operation condition of the kiln system is normal. The kiln tail exhaust emission has no negative influence, and the environmental protection on-line flue gas monitoring shows SO₂The emission value and the denitration ammonia water consumption are equivalent.

The average standard coal consumption of 3 days per ton of clinker is reduced to 101.6kg/t, and the standard coal consumption of per ton of clinker is reduced by 6.9 kg/t.

The clinker yield in 3 days is 3304t/d averagely, and is improved by 115 t/d.

The intensity fluctuation of the clinker is 32.1-35.8 MPa in 3d compressive strength and 56.8-60.3 MPa in 28d compressive strength, the water requirement fluctuation of the standard consistency is 22.2-26.0%, the fluctuation of the setting time is 97-123 min in initial setting and 135-151 min in final setting, and all physical and mechanical property indexes of the clinker are improved.

The material sample is cooked for 3 days, the detected content fluctuation of the chloride ions is 0.030-0.054%, and the detected content fluctuation is all lower than the standard that the chloride ions in the cement industry are less than 0.06%.

Example 3

This embodiment is as followsThe method is carried out on a cement production line with a pre-decomposition kiln drying method for a 4.3 × 64.5.5 m kiln with a five-stage cyclone preheater in a certain enterprise, when the cement production line is in normal production, a kiln tail smoke chamber, a throat, slight skinning and long rings in a kiln are formed, the stability of the kiln condition is good, a small amount of glutinous rice dumpling yellow reducing material is mixed in clinker, the average yield of the clinker under the normal kiln condition is 3326t/d, the actual standard coal consumption of the clinker is 107.9kg/t, the fluctuation of the vertical lifting weight of the clinker is 1180-1330 g/L, the fluctuation of f-CaO is 0.5-1.2%, the fluctuation of the clinker strength is 24.6-33.9 MPa and 52.8-59.2 MPa at 3d, the fluctuation of the standard water demand is 22.5-27.5%, the fluctuation of the setting time is 100-137 min at the initial setting, 133-165 min at the final setting, and chloride ions^-) The content is 0.009%.

The waste incineration fly ash used in the embodiment is derived from waste incineration fly ash stored in a household waste incineration power plant, and the elemental analysis of the waste incineration fly ash is SiO₂9.59%、Al₂O₃4.06%、Fe₂O₃1.48%、CaO 38.95%、MgO 2.55%、Cl 19.24%、SO₃4.84%、K₂O 3.97%、Na₂O 3.14%、C 4.52%、Zn 3.122%、Pb 1.678%、Mn624.8mg/kg、Cu 387.6mg/kg、Cr 342.8mg/kg、Ni 121.7mg/kg、As 161.7mg/kg、Sb189.4mg/kg、Ti 142.6mg/kg、Cd 40.7mg/kg、 Ag 39.6mg/kg、Hg 30.5mg/kg、Co 0.00mg/kg。

The modifying treatment agent used in the embodiment adopts commercially available strong oxidants of chlorine dioxide, sodium metaaluminate and water glass as raw materials, wherein the mass ratio of the chlorine dioxide to the sodium metaaluminate to the water glass is 19.5: 47.5: 33.

the embodiment comprises the following steps: rolling and mixing the garbage incineration fly ash containing moisture (with the humidity of 5-18%) and a modification treatment agent according to the mass ratio of 100: 4.5 for 30min, so that volatile heavy metal particles such as mercury, lead, zinc, cadmium and the like adsorbed in the garbage incineration fly ash are oxidized and converted into heavy metal ions, the heavy metal ions are preliminarily stabilized, volatile peculiar smell is removed, the heavy metal ions are used as combustion-supporting components for clinker combustion, and then the garbage incineration fly ash subjected to modification treatment is sent into a normally-operated dry cement production line system from a discharge pipeline at the cone part of a C5 preheater containing high-temperature calcium oxide powder for synergistic treatment.

The co-processing amount of the waste incineration fly ash is gradually increased to 3.8 percent from 0.5 percent of the mass of the raw materials entering the dry cement production line.

The test is continuously operated for 72 hours, the kiln condition is obviously improved, the preheater, a kiln tail smoke chamber, a throat and the kiln are not obviously skinned and stuck, the kiln head is clear, no flying sand exists basically, the caking property of clinker is good, no reducing material exists, the fluctuation of the vertical lifting weight of the clinker is 1280-1380 g/L, the fluctuation of f-CaO is 0.3-0.9%, and the operation condition of a kiln system is normal. The kiln tail exhaust emission has no negative influence, and the environmental protection on-line flue gas monitoring shows SO₂The emission value and the denitration ammonia water consumption are equivalent.

The average standard coal consumption of 3 days per ton of clinker is reduced to 100.9kg/t, and the standard coal consumption of per ton of clinker is reduced by 7.0 kg/t.

The clinker yield in 3 days is 3513t/d averagely, and is improved by 187 t/d.

The intensity fluctuation of the clinker is 32.4-35.8 MPa in 3d compressive strength and 56.7-61.3 MPa in 28d compressive strength, the water requirement fluctuation of the standard consistency is 22.5-26.5%, the fluctuation of the setting time is 96-124 min in initial setting and 126-154 min in final setting, and all physical and mechanical performance indexes of the clinker are improved.

And (3) cooking the material sample for 3 days, wherein the detected content fluctuation of the chloride ions is 0.029-0.054%, and the detected content fluctuation is all lower than the standard that the chloride ions in the cement industry are less than 0.06%.

Example 4

In the embodiment, phi 4.5 × 54m pre-decomposition kiln with six-stage cyclone preheater for a certain enterpriseThe dry cement production line is carried out, when the dry cement production line is in normal production, a kiln tail smoke chamber, a necking and a kiln are internally provided with moderate crusts and long rings, the kiln condition is stable, and a small amount of the glutinous rice dumpling yellow reducing material is mixed in clinker. The average output of clinker under normal kiln conditions is 3782t/d, the actual standard coal consumption of the clinker is 107.3kg/t, the vertical rise weight fluctuation of the clinker is 1160-1310 g/L, the f-CaO fluctuation is 0.5-1.2%, the clinker strength fluctuation is 24.9-32.6 MPa in 3d compressive strength and 52.8-58.9 MPa in 28d compressive strength, the water requirement fluctuation of standard consistency is 23-28%, the fluctuation of condensation time is 98-130 min in initial setting and 135-168 min in final setting, and chloride ions (Cl)^-) The content is 0.009%.

The waste incineration fly ash used in the embodiment is derived from waste incineration fly ash stored in a household waste incineration power plant, and the elemental analysis of the waste incineration fly ash is SiO₂19.60%、Al₂O₃4.18%、 Fe₂O₃1.93%、 CaO 29.05%、MgO2.37%、 Cl 7.85%、SO₃3.28%、K₂O 2.15%、Na₂O 1.12%、C 4.36%、Zn 1.083%、Pb 1.582%、Mn624.9mg/kg、Cu 408.6mg/kg、Cr 317.5mg/kg、Ni 113.8mg/kg、As 137.7mg/kg、Sb195.3mg/kg、Ti 405.8mg/kg、Cd 40.6mg/kg、 Ag 32.4mg/kg、Hg 30.1mg/kg、Co 0.00mg/kg。

The embodiment comprises the following steps: mixing, grinding and ageing the waste incineration fly ash and a modification treatment agent according to the mass ratio of 100: 2.8 for 1-8 hours, so that volatile heavy metal particles such as mercury, lead, zinc, cadmium and the like adsorbed in the waste incineration fly ash are oxidized and converted into heavy metal ions, the heavy metal ions are preliminarily stabilized, volatile peculiar smell is removed, the heavy metal ions are used as combustion-supporting components for sintering clinker, and then the modified waste incineration fly ash is sent into a normally-operated dry cement production line system from a C6 preheater upstream air pipe rich in calcium oxide micro powder for synergistic treatment.

The co-processing amount of the waste incineration fly ash is gradually increased to 4.9 percent from 0.5 percent of the mass of the raw materials entering the dry cement production line.

The test is continuously operated for 72 hours, the preheater, the kiln tail smoke chamber, the necking and the kiln are not obviously skinned and stuck, the kiln head is clear, no flying sand exists basically, the caking property of the clinker is good, no reducing material exists, the fluctuation of the vertical lifting weight of the clinker is 1280-1380 g/L, the fluctuation of f-CaO is 0.3-1.0%, and the operation condition of the kiln system is normal. The kiln tail exhaust emission has no negative influence, and the environmental protection on-line flue gas monitoring shows SO₂The emission value and the denitration ammonia water consumption are equivalent.

The average standard coal consumption of 3 days per ton of clinker is reduced to 100.9kg/t, and the standard coal consumption of per ton of clinker is reduced by 6.4 kg/t.

The clinker yield in 3 days is 3987t/d averagely, and is improved by 205 t/d.

The intensity fluctuation of the clinker is 32.9-36.4 MPa in 3d compressive strength and 56.8-60.7 MPa in 28d compressive strength, the water requirement fluctuation of the standard consistency is 22.5-26.5%, the fluctuation of the setting time is 97-123 min in initial setting and 135-151 min in final setting, and all physical and mechanical property indexes of the clinker are improved.

The material sample is cooked for 3 days, the detected content fluctuation of the chloride ions is 0.027-0.054%, and the detected content fluctuation is all lower than the standard that the chloride ions in the cement industry are less than 0.06%.

The production test shows that the embodiment is feasible for modifying the waste incineration fly ash as a sintering aid for sintering the clinker, can effectively improve the kiln condition, reduce the heat consumption of sintering the clinker, save partial calcium and siliceous raw materials, improve the quality and the physical and mechanical properties of the clinker to a certain extent, and has no negative effect on the emission of flue gas.

Example 5

This example was carried out on a cement production line by a predecomposition kiln drying method with a 4.8 × 74m and a five-stage cyclone preheater in a certain enterprise, and during normal production, the kiln tail smoke chamber, the throat, the interior of the kiln were lightly skinned and long-looped, the stability of the kiln conditions was stable, and a small amount of the Zongzi-like reducing material was mixed in the clinkerThe average clinker yield is 5776t/d, the actual standard coal consumption of the clinker is 107.6kg/t, the vertical lifting weight fluctuation of the clinker is 1230-1340 g/L, the f-CaO fluctuation is 0.5-1.0%, the clinker strength fluctuation is 3d compressive strength 24.6-32.9 MPa and 28d compressive strength 52.8-58.9 MPa, the water requirement fluctuation of the standard consistency is 23-28%, the coagulation time fluctuation is 104-137 min in initial coagulation and 139-168 min in final coagulation, and chloride ions (Cl)^-) The content is 0.013%.

The waste incineration fly ash used in the embodiment is derived from waste incineration fly ash stored in a household waste incineration power plant, and the elemental analysis of the waste incineration fly ash is SiO₂9.47%、Al₂O₃4.15%、Fe₂O₃1.54%、 CaO 35.86%、MgO 2.65%、Cl 11.47%、SO₃4.36%、K₂O 2.79%、Na₂O 1.57%、C 4.39%、Zn 2.861%、Pb 1.574%、Mn606.9mg/kg、Cu 388.7mg/kg、Cr 306.9mg/kg、Ni 115.8mg/kg、As 163.9mg/kg、Sb179.5mg/kg、Ti 128.5mg/kg、Cd 38.9mg/kg、 Ag 35.9mg/kg、Hg 29.7mg/kg、Co 0.00mg/kg。

The modifying agent used in this example uses a self-made strong oxidant potassium ferrate, commercially available silica fume powder, and sodium metaaluminate as raw materials, wherein the mass ratio of potassium ferrate, silica fume powder, and sodium metaaluminate is 13.5: 36.5: 50.

The embodiment comprises the following steps: rolling and mixing wet (humidity 10-31%) waste incineration fly ash and a modification treatment agent according to the mass ratio of 100: 1.9 for 60min, so that volatile heavy metal particles such as mercury, lead, zinc, cadmium and the like adsorbed in the waste incineration fly ash are oxidized and converted into heavy metal ions, the heavy metal ions are preliminarily stabilized, volatile peculiar smell is removed, the heavy metal ions are used as combustion-supporting components for clinker combustion, and then the modified waste incineration fly ash is sent into a normally-operated dry cement production line system for cooperative treatment from a discharge pipeline at the cone part of a C5 preheater containing high-temperature calcium oxide powder.

The co-processing amount of the waste incineration fly ash is gradually increased to 3.1 percent from 0.5 percent of the mass of the raw materials entering the dry cement production line.

Test ofThe continuous operation is carried out for 72 hours, the kiln condition is obviously improved, the preheater, a kiln tail smoke chamber, a throat and the kiln are not obviously skinned and stuck, the kiln head is clear, no flying sand exists basically, the caking property of clinker is good, no reducing material exists, the fluctuation of the vertical lifting weight of the clinker is 1280-1380 g/L, the fluctuation of f-CaO is 0.3-0.9%, and the operation condition of a kiln system is normal. The kiln tail exhaust emission has no negative influence, and the environmental protection on-line flue gas monitoring shows SO₂The emission value and the denitration ammonia water consumption are equivalent.

The average standard coal consumption of 3 days per ton of clinker is reduced to 102.3kg/t, and the standard coal consumption of per ton of clinker is reduced by 5.3 kg/t.

The clinker yield in 3 days is 5973t/d averagely, and is improved by 197 t/d.

The intensity fluctuation of the clinker is 32.7-36.6 MPa in 3d compressive strength and 56.6-60.8 MPa in 28d compressive strength, the water requirement fluctuation of the standard consistency is 22.5-26.5%, the fluctuation of the setting time is 98-124 min in initial setting and 130-153 min in final setting, and all physical and mechanical property indexes of the clinker are improved.

And (3) after the material sample is cooked for 3 days, the fluctuation of the detected content of the chloride ions is 0.027-0.050%, and the content is all lower than the standard that the chloride ions in the cement industry are less than 0.06%.

Claims

1. A method for treating waste incineration fly ash by using a cement kiln in a synergic manner is characterized by comprising the following steps: and (3) modifying the waste incineration fly ash, wherein the modified waste incineration fly ash is used as a sintering aid component for sintering clinker in the dry cement production line, namely the modified waste incineration fly ash is sent into a normally-running dry cement production line system from a preheater system C5 or C6 for cooperative treatment.

2. The method for the cement kiln co-disposal of waste incineration fly ash according to claim 1, wherein: the treatment capacity of the waste incineration fly ash is 0.1-5.0% of the quality of the raw material of the dry cement production line.

3. The method for the cement kiln co-disposal of waste incineration fly ash according to claim 1 or 2, characterized in that: the modification treatment is to carry out strong oxidation curing treatment on the waste incineration fly ash, namely adding a modification treatment agent into the waste incineration fly ash for mixing reaction in the processes of stirring, mixing, rolling, mixing or grinding and mixing.

4. The method for the cement kiln co-disposal of waste incineration fly ash according to claim 3, wherein: the addition amount of the modification treatment agent is 0.1-5.0% of the mass of the waste incineration fly ash, and preferably 0.3-3.0%.

5. The method for the cement kiln co-disposal of waste incineration fly ash according to claim 3 or 4, wherein: the modifying treatment agent is a strong oxidant or a mixture of the strong oxidant and at least one of silicon micro-gel and aluminum micro-gel.

6. The method for the cement kiln co-disposal of waste incineration fly ash according to claim 5, wherein: in the mixture of the strong oxidant, the silicon micro-gel and the aluminum micro-gel, the mass ratio of the strong oxidant to the silicon micro-gel to the aluminum micro-gel is 1: 1-10.

7. The method for the cement kiln co-disposal of waste incineration fly ash according to claim 5 or 6, wherein: the strong oxidant is at least one of chlorine dioxide, fluorosulfonic acid, fluoroantimonic acid and ferrate; the silicon micro-gel is at least one of silica gel powder, silica gel liquid, silica fume powder and water glass; the aluminum micro-gel is at least one of metaaluminate, activated alumina and aluminum hydroxide.

8. The method for the cement kiln co-disposal of waste incineration fly ash according to one of claims 3 to 7, wherein: when the modifying treatment agent is used for modifying, the strong oxidant is premixed with the silica micro-gel and the aluminum micro-gel or directly added into the waste incineration fly ash or added into the waste incineration fly ash step by step for use.

9. The method for the cement kiln co-disposal of waste incineration fly ash according to one of claims 3 to 8, wherein: adding a modifying treatment agent into the waste incineration fly ash for mixing reaction, and adding at least one of lime, carbide slag, cement powder, slag powder, silicon powder, calcium carbonate powder, bentonite, attapulgite powder or a liquid-solid substance containing hydrocarbon as an auxiliary material in the modifying treatment process; the doping amount of the auxiliary materials is 0-15% of the mass of the waste incineration fly ash.

10. The method for the cement kiln co-disposal of waste incineration fly ash according to one of claims 1 to 9, wherein: the preheater system comprises a five-stage cyclone preheater and a six-stage cyclone preheater, namely modified waste incineration fly ash is conveyed into a normally-operated dry cement production line system from a discharge pipeline at the cone part of the C5 or C6 preheater containing a large amount of high-temperature calcium oxide powder for cooperative treatment, or conveyed into the normally-operated dry cement production line system from an upstream air pipe of the C5 or C6 preheater rich in calcium oxide micropowder for cooperative treatment.