CN101386480A - Method for producing portland cement clinker using domestic waste incineration residue - Google Patents
Method for producing portland cement clinker using domestic waste incineration residue Download PDFInfo
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- CN101386480A CN101386480A CNA2008101991561A CN200810199156A CN101386480A CN 101386480 A CN101386480 A CN 101386480A CN A2008101991561 A CNA2008101991561 A CN A2008101991561A CN 200810199156 A CN200810199156 A CN 200810199156A CN 101386480 A CN101386480 A CN 101386480A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a method for producing Portland cement clinker with incineration slag of municipal solid waste. The method is to mount a by-way air exhaust device on the prior novel cement kiln so as to solve the problem of crust and blockage caused by chlorine brought into the kiln by the slag. For a kiln system with a kiln row and a furnace row which are independent from each other, the by-way air exhaust device is arranged in an uptake of a kiln end gas chamber in the kiln row close to a five-stage cylinder; while for common industrial kiln, the air exhaust device is arranged between an outlet of decomposing furnace and an inlet of the five-stage cylinder or arranged at an uptake of an outlet of the five-stage cylinder. The use frequency of the by-way air exhaust device is between once per eight hours and once per three days, the temperature of the air entering the by-way air exhaust device is controlled to be more than 950 DEG C. The method is simple in process, low in treatment cost, and complete in toxicity removal due to the fact that heavy metals in the slag are solidified in the Portland cement clinker and are solidified in hydrates during the hydration of the mineral compositions of the Portland cement clinker. The method contributes to the development of cyclic economy and reduces the consumption of natural resources and energy of the cement industry.
Description
Technical field
The present invention relates to the production method of portland cement clinker, particularly relate to the method for utilizing domestic waste incineration residue to produce Portland clinker.This method is by Cement industry kiln recycling domestic waste incineration residue.
Background technology
Domestic garbage burning electricity generation is one of main path of present appropriate developing processing domestic refuse.Dregs of incinerator is the byproduct in burning city domestic garbage power station, and one ton of domestic refuse of every burning produces 0.2 ton of slag (being also referred to as bottom ash) approximately, and it comprises incineration residue residual on the fire grate and the particulate matter from dropping between fire grate.Contain heavy metal and more alkalimetal ion (K such as a certain amount of Cd, Hg, Pd, As, Cr, Se, Zn in the dregs of incinerator
+, Na
+) and chlorion, wherein most of heavy metal content have exceeded the III class soil restriction of GB15618-1995 regulation.Though the stripping of its heavy metal surpasses the specified requirement of GB5085.3-2007 " the Hazardous wastes judging standard---leaching toxicity is differentiated ", belong to Ordinary solid waste, but most heavy metal that is dissolved has exceeded the water quality requirement of the surface water of GB 3838-2002 regulation to some extent.III class soil standard is for ensureing the soil threshold value of agricultural and forestry production and plant normal growth.III class surface water is the requirement of II level protective belt, Drinking Water surface water seedbed; V class surface water is the requirement in agricultural water district and general view requirement waters.Therefore, if make landfill disposal or general disposition of solid waste by existing general mode, both appropriation of land resources, contaminated soil, but also polluted surface water pollute and destroy the mankind's ecotope.And the expense of landfill slag needs 40～50 yuan/ton.Along with the quickening of domestic garbage burning electricity generation factory construction speed, the output of dregs of incinerator is also increasing.How more safely to handle slag, turn harm into good, brought huge social pressure and economic pressures for environmental sanitation department of government.
The recycling approach of slag mainly contains in the world: 1. as the alternative aggregate of bituminous concrete; 2. the part as cement concrete substitutes aggregate; 3. as the covering material of landfill yard, this method is not alleviated the processing pressure of landfill yard waste water; 4. as the packing material of embankment, roadbed, there is pollution problem in this method slag heavy metal stripping to surface water; 5. be used to make wall brick and floor tile, but because slag need pass through pre-treatment, cost raises, downgrade, therefore large-scale popularization is not used.
The domestic resource utilization industry of still not having a slag is used, and domestic research report mainly contains: (1) is as the mixed material of ordinary Portland cement, but its volume only is 5%～10%, excessively will have cement performance decline problem.(2) as the blended material of masonry cement, volume can reach 15%～50%; (3) be used to make concrete product, particularly make building slabs such as kerbstone, lawn brick, pavement bricks, building block and partition plate.
Slag is mainly used in the production of concrete base building material both at home and abroad to slag recycling situation from above-mentioned, and major part is used for road and industrial civil building.There is following deficiency in existing comprehensive utilization of slag technology: (1) is owing to contain plastics bag, cloth, the wood that does not burn in the slag, and relatively large brick and glass, and has certain stink, stink has certain toxicity, therefore before implementing, above-mentioned application technology as the second resource needs slag is carried out sorting and deodorizing pre-treatment, complex process, processing cost increases; When (2) being used for concrete alternative aggregate, alkalimetal ion and chlorion are not arranged in the slag to the report research and the solution of concrete durability (as steel bar corrosion, alkali-aggregate reaction etc.); (2) slag of admixture 5%～10% is as blended material, do not consider in the slag alkali, chlorion etc. to the harm of goods weather resistance, and slag do not possess pozzolanic activity, can only mix and more easily cause cement performance to decline to a great extent as the inertia blended material; (3) big volume is used to make floor tile, and the research and the report of the molten situation of heavy metal of its goods do not arranged, and the heavy metal stripping is then comparatively troubling to surface water, phreatic pollution.
Summary of the invention
The objective of the invention is to overcome the problem that prior art exists, provide that a kind of Cement industry kiln is innoxious, resource utilization and the low-cost method of utilizing domestic waste incineration residue to produce Portland clinker.
Purpose of the present invention realizes by the following technical solutions:
Utilize domestic waste incineration residue to produce the method for Portland clinker, comprise the steps:
(1) transformation of existing kiln: on the basis of existing new type nonaqueous cement kiln, set up the bypass device; Be listed as independently kiln system for kiln, stove two, the bypass device is located at the position of kiln row kiln tail smoke-box increase in pipeline near 5 grades of tubes; For the general industry kiln, before decomposing furnace is exported to 5 grades of tubes inlet or the increase in pipeline place that exports of 5 grades of tubes set up the bypass device;
(2) preparation of raw material: preparation of raw material: common meal by percentage to the quality, respectively with 0.01%～15% slag, 75～88% Wingdales, 0～15% sand shale, 0～15% clay, 0～15% volcanic ash, 0～10% flyash, 0～10% iron powder fragmentation, homogenizing reaches the batching that requires according to grog rate value, become the common meal of fineness (0.08mm sieve tail over)≤25% through the raw mill grinding, with moisture content≤4%, fineness (tailing over of 0.08mm sieve)≤10%, the coal dust of calorific value 〉=5500kcal/kg is sintered into portland cement clinker, and the standard hear rate of grog is 100～120kg mark coal/kg grog;
(3) preparation of cement clinker: in the clinker burning process, coal dust is (55%～65%) according to weight ratio: the ratio of (35%～45%) sprays into from decomposing furnace and kiln hood respectively, common meal is through 1 grade of tube to 4 grade tube drying and preheating, in decomposing furnace, finish the decomposition of lime carbonate, coal ash behind coal dust firing enters the kiln tail carries out grog in rotary kiln calcining through 5 grades of tubes, grog falls into the chamotte cooler cooling from kiln hood, enters clinker warehouse and stores; In the clinker burning process, burning zone temperature maintains 1250 ℃～1450 ℃, and clinkering zone length is 25%～35% of kiln length, and kiln tail smoke-box temperature is 1000 ℃～1200 ℃, the decomposing furnace temperature out is 850 ℃～950 ℃, and heat consumption of clinker is 100～120kg mark coal/kg grog; Bypass is each to be used 1～30 minute, and frequency of utilization is 1 time/8 hours～1 time/3 days, and the gas temperature that enters shunting device is controlled at more than 950 ℃.
Described bypass device mainly is made of the meal classification whirlwind tube, bag filter and the exhaust blower that connect successively, and the bypass device links to each other with the pipeline of kiln system by valve.
By percentage to the quality, the add-on of described slag is 2.0%～7.5% of a common meal.
At present domestic Industrial Stoves are not provided with the bypass device substantially, and the present invention studies show that, chlorine is 950 ℃ of a large amount of volatilizations of beginning, at 1450 ℃ evaporation raties near 100%; Sulphur is 1250 ℃ of a large amount of volatilizations of beginning; Alkali at first with muriatic form volatilization, volatilizees with the form of sulfide then.The skinning that chlorine causes mainly appears at below 900 ℃, and corresponding Industrial Stoves mainly appear at the position that decomposing furnace is exported to 5 grades of tubes, or the upper end of kiln tail funnel uptake is near 5 grades of tube entry positions.The present invention therefore before 5 grades of tubes inlets, the upper end of exit or funnel uptake sets up the bypass device, the skinning problem of solution chlorine.Do not need continuous use in the actual application, just when frequently skinning occurring, just adopt.Bypass can slightly increase the hear rate of grog.The collected a small amount of chloride dust of bypass, because part has formed chloride mineral with the component in the cement slurry in kiln, its harm to the cement steel corrosion can reduce, these dust can mix as a spot of blended material in grinding the cement process, because its quantity is few, under cl content was up to state standards 0.06% prerequisite that requires in satisfying cement, can dissolve fully finished, and can not produce harm to the steel bar corrosion of cement; The skinning that sulphur causes mainly occurs 1000～1200 ℃, mainly is the lower end of smoke-box and funnel uptake corresponding to Industrial Stoves.Because bypass is not remarkable to the skinning problem effect that solves sulphur and cause, the problem that therefore solves the sulphur skinning is mainly by air bubble, prevents that the limit wall that skinning is bonded at kiln or pipeline from causing obstruction.A large amount of sulphur can be solid-solubilized in the grog and be taken out of by grog, and sulphur has no adverse effect to the grog performance.
In addition, the chlorine that slag is brought into, alkali, sulphur have burnt till certain fluxing action to grog, can improve the burn-ability of cement slurry, improve the output of cement kiln, reduce grog and burn till hear rate; But the existence of these components, also reduced simultaneously the actual saturation factor of grog, the resistance to compression that causes cement clinker is strength degradation slightly, can reduce in the slag unwanted component to the influence of cement clinker ultimate compression strength by means such as suitable regulation value prescriptions, also not influence the output of Industrial Stoves simultaneously.Therefore, in cement kiln cooperative disposal slag process,, output, clinker quality and the energy consumption of kiln all do not had disadvantageous effect, realized purpose low-cost, innoxious, comprehensive utilization of resources fully by the optimization that clinker mineral is formed.
Though slag does not contain toxicants such as dioxin, its stink is bigger, and suggestion separately sealing is stacked, measured and prepare burden by existing production technique.
Principle of the present invention: the main chemical compositions in (1) slag is close with the cement raw material composition, as one of raw material of raw material, promptly can satisfy the calcining requirement of cement clinker with it, also can reduce the consumption of Cement industry to natural resource clay and Wingdale.(2) most of heavy metals are lower at 1450 ℃ evaporation rate, can be solid-solubilized in the cement clinker mineral, for the higher heavy metal of evaporation rate under the high temperature (as Pb), because the alkaline environment of flue gas and the temperature lower (＜380 ℃) of fume emission in the kiln, the heavy metal concentration that finally reaches capacity in the flue gas in kiln, most heavy metals still can be solidly soluted in the clinker mineral.Heavy metal in the clinker mineral by hydrated product absorption parcel, still can play good solidification effect in cement hydration process.Because odorous gas can be decomposed into the odorless innoxious substance more than 100 ℃, therefore under Cement industry kiln negative pressure, hot environment, there is not environmental pollution to air.(3) since the mineral composition of the slag volume mixed of cooperative disposal process and grog can adjust and optimize according to the composition of slag, a small amount of unwanted component (alkali, chlorine) that slag is brought in the raw material can be by the high-temperature calcination volatilizing and enriching in the kliner coating of rotary kiln, and is little to the use range influence of grog performance and cement products.(4) cooperate facilities such as air bubble, bypass, can solve the influence of alkali, chlorine, sulphur, ensure the safe handling of Industrial Stoves skinning.
The present invention has following advantage with respect to the disposal technology of existing slag:
(1) thoroughly realize innoxious.Heavy metal in the slag is cured in the cement clinker mineral, in the clinker mineral hydration process, be cured in the hydrated product, even cement products wrecks, hydrated product is carbonized fully, and the stripping of heavy metal still can reach the V class surface water quality requirement of GB 3838-2002 regulation.
(2) realize resource utilization, help developing a circular economy, reduce the consumption of Cement industry natural resource, the energy.For the dry method kiln cement mill of 5000 tons of grogs of a daily output, the volume 3%～5% that accounts for common meal by slag calculates, and can handle slag in one day can reach 200～375 tons, can handle slag 6～70,000 ton in 1 year, can save natural resource 6～70,000 ton/year.Promptly solve the soil anxiety and the problem of environmental pollution of slag landfill, helped the Sustainable development of society again.
(3) disposing technique is simple, and processing costs is low.This invention can make full use of the technology of existing Cement industry kiln, substantially do not increase the production energy consumption of cement clinker in the operational process, than the processing costs of landfill more than 40～60 yuan/ton, processing costs of the present invention is lower, and has slowed down the situation of refuse landfill land resources anxiety.Because slag has stink, also contain wood, cloth, ferrous material and the plastics bag etc. that do not burn, be used for other technologies such as brickmaking and making cement blended material, need it is carried out the pre-treatment of deodorizing, deironing, screening and oven dry, increased processing costs, and the treatment process that the present invention proposes is very high because of temperature in the cement kiln, and the material that does not burn can burn away, decompose, and need not slag is carried out pre-treatment.As for iron block metalloid material,, therefore, need not additionally to add treatment facility because cement slurry was furnished with deironing apparatus before grinding.And by the cooperative disposal of cement kiln, slag all has no adverse effect to furnace output and grog performance, and the comprehensive treating process cost is low in the cooperative disposal process.
Embodiment
In order to understand technical characterstic of the present invention better, the present invention is further illustrated below in conjunction with embodiment, need to prove, embodiment is not a limiting the scope of the invention.
Embodiment 1:
4.75 * 75 meters of Φ, have bi serie (kiln row and stove be listed as) Pyatyi suspended preheater and FLS and spurt and carry out the test that cooperative disposal Lee cheats the garbage incinerating power plant slag on the new type nonaqueous cement kiln of formula decomposing furnace.Ash removing opening, air bubble have all been designed with artificial deashing service platform in the decomposing furnace of this cement kiln, 5 grades of positions such as tube, kiln tail smoke-box and smoke-box funnel uptake.Position (850～950 ℃ of temperature ranges) at the close 5 grades of tubes of kiln tail funnel uptake has increased the bypass device, and this device links to each other with kiln tail funnel uptake by a controlled valve, is furnished with meal classification whirlwind tube and bag filter and exhaust blower.Opening valve can make interior material of part kiln and gas enter bypath system, through meal classification whirlwind tube that material is separated from the gas, material is gone into kiln again, gas effluxes after the bag filter dedusting, the chloride dust that bag filter is collected transports the cement grinding system to, becomes cement as micro-blended material with the grog grinding.
By weight percentage, the proportioning of common meal is 2.0% part of slag, 88% part of Wingdale, 3.0% part of sand shale, 7.0% part of iron powder.Wherein slag is without sorting and deodorizing, the original state slag of water ratio about 17%, the slag sealing is stored up, measure through the feed proportioning storehouse, with through broken, homogenizing, be conveyed into raw mill through the bistrique deironing apparatus by belt together with materials such as the Wingdale that measured, sand shale, iron powders, grinding becomes fineness and the qualified raw material powder of chemical ingredients, enters the raw material storage vault through lift.Coal originates from Guizhou Province, and the calorific value of coal dust is 5500kcal/kg, volatile matter 24%, and ash 16%, fineness is 10%, moisture is 4%.
In the clinker burning process, coal dust sprays people's decomposing furnace and kiln hood respectively according to the ratio of 6:4 approximately, common meal is through 1 grade of tube to 4 grade tube drying and preheating, in decomposing furnace, finish the decomposition of lime carbonate, coal ash behind coal dust firing enters the calcining that the kiln tail carries out grog through 5 grades of tubes, grog falls into the chamotte cooler cooling from kiln hood, enters clinker warehouse and stores.The temperature at each reference mark of Industrial Stoves is as follows: burning zone temperature maintains 1250 ℃～1450 ℃, clinkering zone length is 24 meters, kiln tail smoke-box temperature is 1050 ℃～1150 ℃, the decomposing furnace temperature out is 870 ℃～900 ℃, 1 grade of tube temperature out is about 320 ℃～340 ℃, heat consumption of clinker is 105～108kg mark coal/kg grog, and the output of kiln is 5200～5300 tons of grog/skies.Run well for keeping kiln, the high-temperature blower resistance is constant substantially, and the workload of labor cleaning's smoke-box and increase in pipeline skinning is 1 time/8 hours, and the air bubble frequency of usage is 1 time/4 hours, and the bypass frequency of usage is 1 time/3 days, each 20～30 minutes.The heavy metal stripping situation that detects by " solid waste leaches the horizontal succusion of toxicity leaching method " (GB 5086.3-1997) before and after the chemical ingredients of the grog of producing, physicals and the carbonization of 28 days glue sand of cement test specimen thereof is shown in table 1, table 2 and table 3 (wherein the 1# sample is not for mixing the blank sample of slag) respectively.
Form from grog, mix burn slag after f-CaO downtrending is arranged, illustrate that slag has the effect that improves burnability of raw material.Do not compare when burning slag with mixing, the 2# sample is by using bypass, and the content of alkali chlorine still can maintain lower level in its grog, satisfies that cl content is not more than 0.06% production requirement in the cement, and grog and cement performance are safe from harm; From performance, standard consistency changes little, and slightly prolong time of coagulation, and 3d intensity slightly improves, and 28d intensity slightly descends.Still can the be up to state standards requirement of JC/T853-1999 " Portland clinker " 52.5 grades of the intensity of grog.The stripping of heavy metal can reach the requirement of III class surface water after its glue article maintenance to 28 day, and the stripping of its heavy metal still can reach the requirement of V class surface water after the goods carbonization.
The chemical ingredients of table 1 embodiment 1 grog and rate value
| Sample | The slag volume | Loss | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | f-CaO | SO 3 | K 2O | Na 2O | C1 |
| 1# | 0 | 0.62 | 21.04 | 5.20 | 5.17 | 64.81 | 1.03 | 1.02 | 1.10 | 0.64 | 0.08 | 0.045 |
| 2# | 2.0 | 0.48 | 21.39 | 5.85 | 4.16 | 64.88 | 1.23 | 0.67 | 1.12 | 0.68 | 0.12 | 0.048 |
The physicals of table 2 embodiment 1 grog
Heavy metal stripping situation before and after the table 3 embodiment 1 cement 28d glue article carbonization
Embodiment 2
By 4.8 * 72 meters of Φ, new type dry kiln production line cooperative disposal Lee who has bi serie Five Classics level suspended preheater and RSP decomposing furnace cheats the slag test of garbage incinerating power plant.This production line has additional the bypass device at 5 grades of tube outlet positions.By weight percentage, adopt 5.0% part of slag, 15.0% part of volcanic ash, 4.2% part of high clunch, 75.8% part of Wingdale carries out the batching of common meal.The slag that is shipped by garbage incinerating power plant need not pass through sorting, drying and deodorizing and stack separately, by entering the pre-homogenization yard of siliceous material after the batching scale metering, be deposited in the bottom, continue to stack clay product (both can play homogenizing, and also can prevent and reduce the effusion of stink) above by the covering of clay seam.After deironing apparatus is delivered to raw mill by belt, qualified raw material powder rises to the storage of raw material homogenizing storehouse to be prepared into fineness according to the various material meterings of the proportioning of raw material.Coal is Indonesia's coal and the coal that mixes of Fujian coal, calorific value 5800kcal/kg, and volatile matter 15%, ash 19%, grinding to moisture is 2.0%, fineness is that 6% coal dust is stored in Pulverized Coal Bin.
In the clinker burning process, clinkering zone length is 22 meters, burning zone temperature is 1250 ℃～1450 ℃, the smoke-box temperature is 1100 ℃～1200 ℃, 900～920 ℃ of decomposing furnace temperature outs, 5 grades of tube temperature outs are 860 ℃～880 ℃, 1 grade of tube temperature out is 290 ℃～320 ℃, the output of kiln is 5600～5700 tons of grog/skies, and heat consumption of clinker is 100～103kg standard coal/kg grog.When grog rate value was low, the skinning of smoke-box and decomposing furnace increased, and the workload that the workman clears up skinning reaches 2 times/8 hours, air bubble operating frequency 1 time/hour.The skinning showed increased of Pyatyi tube, cl content reaches 0.41% in 5 grades of hot raw material of tube after testing, needs to use bypass device (this moment, the decomposing furnace temperature out need be increased to 950 ℃, and 5 grades of tube temperature outs are about 880～900 ℃).The frequency of bypass is about 1 time/16 hours, each about 20～30 minutes.Kiln output is suitably improved (being increased to 5400～5500 tons of grog/skies) or batching rate value and slightly adjust back (slag 5%, volcanic ash 15%, high clunch 2.0%, Wingdale 78%), skinning can suitably improve, labor cleaning's skinning 1 time/8 hours, air bubble 1 time/4 hours, bypass 1 time/12 hours, each 10～20 minutes.The slag volume is adjusted at 0.01% o'clock (be common meal consist of slag 0.01%, sand shale 15%, volcanic ash 5%, high clunch 1.49%, Wingdale 78.5%), the skinning degree of kiln can reduce significantly, basically identical when control of kiln processing parameter and slag 5.0%, the bypass frequency of usage is reduced to 1 time/3 days, each 1～10 minute.The chemical ingredients of duration of test grog, physicals are respectively shown in table 4, table 5.
The chemical ingredients (%) and the rate value of table 4 embodiment 2 grogs
| Sample | The slag volume | Loss | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | f-CaO | SO 3 | Na 2The O equivalent | C1 | KH | n | p |
| 3# | 5.0 | 0.38 | 21.49 | 5.85 | 4.68 | 64.33 | 1.97 | 0.29 | 0.16 | 0.52 | 0.038 | 0.880 | 2.04 | 1.25 |
| 4# | 5.0 | 0.28 | 21.39 | 5.85 | 4.16 | 64.88 | 2.23 | 0.67 | 0.12 | 0.50 | 0.034 | 0.896 | 2.14 | 1.41 |
| 5# | 0.01 | 0.69 | 21.60 | 6.00 | 3.41 | 65.48 | 1.96 | 0.65 | 0.06 | 0.46 | 0.012 | 0.898 | 2.30 | 1.76 |
Annotate: Na
2O equivalent=Na
2O+0.658K
2O
The physicals of table 5 embodiment 2 grogs
As the data of table 3～table 5 as seen, compare with the 5# grog, sulphur, alkali, cl content all have certain increase in 3#, the 4# grog, but all can reach the requirement of standard code, to the not influence of use range of its cement products.Especially use the bypass device, when the slag volume increases by a relatively large margin, still can keep cl content level lower in the grog.When grog rate value is low, because slag to the improvement effect of burn-ability, can be used to improve the output of kiln, perhaps improve the rate value of grog, obtain the higher grog of intensity.After mixing the burning slag, by optimizing the rate value of grog, its standard consistency, time of coagulation, bending and compressive strength can be kept the strength level of not mixing the grog that burns slag substantially.In general, mix slag in the raw material after, the incinerating grog all can reach the above requirement of JC/T853-1999 " Portland clinker " standard 52.5 grades.
Embodiment 3
4.0 * 60 meters of Φ, have the test of carrying out the slag of cooperative disposal domestic garbage burning electricity generation factory on the new type dry kiln production line of single series Pyatyi suspended preheater and CDCR type decomposing furnace.Be carrying out smoothly of guaranteeing to test, the increase in pipeline place that is exported to 4 grades of tubes at 5 grades of tubes of this production line has increased the bypass device.
The slag of 15% part of Shenzhen Yantian garbage incinerating power plant is adopted in test, and 10% part of flyash carries out the preparation of common meal with 75% part of Wingdale.Water ratio is 15% and seals stacking separately without sorting de-odorised slag, measure through the raw meal proportioning storehouse according to raw-meal ingredient, be sent to raw mill by belt with Wingdale, flyash through fragmentation, homogenizing and metering behind deironing apparatus, the raw material powder that it is qualified that grinding becomes fineness enters the raw material homogenizing storehouse and stores.Coal originates from the Hunan, and calorific value is 6000kcal/kg, volatile matter 7%, and ash 16%, being prepared into fineness is 2%, the coal dust of moisture 1.5% is stored in the Pulverized Coal Bin.
In the clinker burning process, clinkering zone length is 18 meters, burning zone temperature is 1250 ℃～1450 ℃, the smoke-box temperature is 1050 ℃～1150 ℃, 860～900 ℃ of decomposing furnace temperature outs, 5 grades of tube temperature outs are 830 ℃～870 ℃, 1 grade of tube temperature out is 320 ℃～340 ℃, the output of kiln is 2650～2700 tons of grog/skies, and heat consumption of clinker is 118～120kg standard coal/kg grog.Do not compare when burning slag with mixing, kiln output increases about 100 tons/day.In the process of the test, labor cleaning's skinning is 3 times/8 hours, about 1 time/45 minutes of air bubble, bypass 1 time/8 hours, each 10～15 minutes.The chemical ingredients of the grog of firing and physicals are respectively shown in table 6, table 7.The heavy metal stripping situation that (GB7023-86) detects by " solid waste leaches the horizontal succusion of toxicity leaching method " (GB 5086.3-1997) and " the long-term leaching test of solidification of radwaste body " before and after the carbonization of 28 days glue sand of sample test specimen is shown in table 8, table 9.
The chemical ingredients (%) and the rate value of table 6 embodiment 3 grogs
| Sample | The slag volume | Loss | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | f-CaO | SO 3 | Na 2The O equivalent | C1 | KH | n | p |
| 6# | 15 | 0.56 | 21.80 | 5.64 | 3.31 | 65.41 | 2.22 | 0.88 | 0.05 | 0.54 | 0.038 | 0.90 | 2.44 | 1.70 |
Annotate: Na
2O equivalent=Na
2O+0.658K
2O
The physicals of table 7 embodiment 3 grogs
Table 8 embodiment 3 cement clinker glue article heavy metal stripping concentration
Annotate: "-" expression instrument fails to detect;
Concentration is leached on table 9 embodiment 3 cement clinker glue article heavy metals surface
By data in the above-mentioned table as seen, mix slag in the raw material after, the incinerating grog still can reach the above requirement of JC/T853-1999 " Portland clinker " standard 52.5 grades.By table 8 as seen, mix slag 15% its goods of incinerating cement because cement clinker mineral solidification effect preferably, the heavy metal content of its leach liquor can reach II class surface water quality standard and safe drinking water standard, and therefore the cement that can use slag to mix burning is made storing facilities of waters such as water pipe, tank.Can be seen that by table 9 stripping of heavy metal mainly concentrates on (0-7d) in early days in the test specimen, the heavy metal surface impregnation liquid in each length of time all can reach II class surface water standard and safe drinking water requirement behind the 7d.
Claims (3)
1, utilizes domestic waste incineration residue to produce the method for Portland clinker, it is characterized in that comprising the steps:
(1) transformation of existing kiln: on the basis of existing new type nonaqueous cement kiln, set up the bypass device; Be listed as independently kiln system for kiln, stove two, the bypass device is located at the position of kiln row kiln tail smoke-box increase in pipeline near 5 grades of tubes; For the general industry kiln, before decomposing furnace is exported to 5 grades of tubes inlet or the increase in pipeline place that exports of 5 grades of tubes set up the bypass device;
(2) preparation of raw material: common meal by percentage to the quality, respectively with 0.01%～15% slag, 75～88% Wingdales, 0～15% sand shale, 0～15% clay, 0～15% volcanic ash, 0～10% flyash, 0～10% iron powder fragmentation, homogenizing reach the batching that requires according to grog rate value, become the common meal of fineness≤25% through the raw mill grinding, with moisture content≤4%, fineness≤10%, the coal dust of calorific value 〉=5500kcal/kg is sintered into portland cement clinker, and the standard hear rate of grog is 100～120kg mark coal/kg grog;
(3) preparation of cement clinker: in the clinker burning process, coal dust is (55%～65%) according to weight ratio: the ratio of (35%～45%) sprays into from decomposing furnace and kiln hood respectively, common meal is through 1 grade of tube to 4 grade tube drying and preheating, in decomposing furnace, finish the decomposition of lime carbonate, coal ash behind coal dust firing enters the kiln tail carries out grog in rotary kiln calcining through 5 grades of tubes, grog falls into the chamotte cooler cooling from kiln hood, enters clinker warehouse and stores; In the clinker burning process, burning zone temperature maintains 1250 ℃～1450 ℃, clinkering zone length is 25%～35% of kiln length, kiln tail smoke-box temperature is 1000 ℃～1200 ℃, the decomposing furnace temperature out is 850 ℃～950 ℃, bypass is each to be used 1～30 minute, and frequency of utilization is 1 time/8 hours～1 time/3 days, and the gas temperature that enters shunting device is controlled at more than 950 ℃.
2, the method for utilizing domestic waste incineration residue to produce Portland clinker according to claim 1, it is characterized in that: described bypass device mainly is made of the meal classification whirlwind tube, bag filter and the exhaust blower that connect successively, and the bypass device links to each other with the pipeline of kiln system by valve.
3, the method for utilizing domestic waste incineration residue to produce Portland clinker according to claim 1, it is characterized in that: by percentage to the quality, the add-on of described slag is 2.0%～7.5% of a common meal.
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| CN200810199156A CN101386480B (en) | 2008-10-15 | 2008-10-15 | Method for producing portland cement clinker using domestic waste incineration residue |
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