Invention content
High-alkali flyash by being mixed in a certain ratio with solid base, grinding by the present invention, again through washing, mistake after heatingThe soil conditioner for being applied to processing heavy metal pollution of soil is obtained after filter, drying and processing.
The purpose of the present invention is designing a kind of technique of high-alkali flyash low temperature alkali process synthesis soil conditioner, feature isHigh-alkali flyash and solid base are mixed in a certain ratio grinding, washed after heating, is filtered, drying, gained soil conditioner toolThe effect for having heavy metal in stable soil can be used for administering heavy metal pollution of soil.
Since technique alkali charge is low, low energy consumption, flow is simple for this, compared with prior art, there is good commercial ApplicationValue.
The present invention makes full use of the alkali-activated carbonatite in high-alkali flyash forming process, reduces rear end alkali charge, and use is lessAlkali number and cleaning water can substantially reduce the content of beary metal in raw material, improve the ability of its curing soil heavy metal.
The technical solution adopted by the present invention is as follows：
(1) a kind of high-alkali coal ash for manufacturing for soil conditioner method, which mixes high-alkali flyash with solid base,Grinding, is washed after heating, is filtered, and soil conditioner is made in drying.Gained soil conditioner is applied to heavy metal pollution in proportionHave the effect of heavy metal in stable soil in soil, it is dense to apply front and back measurement Heavy Metals from Polluted Soils with Heavy Metals ion leachingContent of beary metal in degree and the front and back agricultural product of application.
(2) according to the high-alkali coal ash for manufacturing described in (1) for the method for soil conditioner, high-alkali flyash refers to coal-burning boilerThe fine ash collected by cleaner in tail flue gas, wherein alkali metal mass percent 2%-20%, silicon mass percent10%-50%, calcium mass percent 1%-20%.
(3) according to the high-alkali coal ash for manufacturing described in (1) or (2) for the method for soil conditioner, high-alkali flyash surface areaFor 1-50m2/ g, bulk density 0.8-2g/cm3, particle diameter distribution is 0.5-30 μm.
(4) according to the high-alkali coal ash for manufacturing of (1)-(3) any one of them for soil conditioner method, high-alkali flyash withThe mixing quality ratio of solid base is ranging from：1：0.05-1：5, temperature ranges are：50-800 DEG C, processing time is ranging from0.1-72h。
(5) according to the high-alkali coal ash for manufacturing of (1)-(4) any one of them for soil conditioner method, high-alkali flyash withThe lapping mode of solid base includes following one or at least two arbitrary combination：Mechanical quickly stirring, is milled at ball milling.
(6) according to the high-alkali coal ash for manufacturing of (1)-(5) any one of them for the method for soil conditioner, after grinding heating,Through washing, filtering, drying.Wherein washing temperature is ranging from：0.1 degree Celsius -80 degrees Celsius, preferably 20 degrees Celsius；Drying temperatureRanging from：30 degrees Celsius -120 degrees Celsius, preferably 50 degrees Celsius.
(7) according to the high-alkali coal ash for manufacturing of (1)-(6) any one of them for the method for soil conditioner, the solid base packetInclude following one or at least two arbitrary combination：Sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, potassium carbonate, carbonic acidHydrogen potassium, ammonium hydrogen carbonate, ammonium carbonate.
(8) products obtained therefrom is dried for the method for soil conditioner according to the high-alkali coal ash for manufacturing of (1)-(7) any one of themPH value range is：8-12, preferably 9-11.
(9) according to the high-alkali coal ash for manufacturing of (1)-(8) any one of them for the method for soil conditioner, the drying gainedSoil conditioner alkali metal quality accounting is 1%-20%, and siliceous amount accounting is 10%-50%, and calcareous amount accounting is 1%-20%.
(10) according to the high-alkali coal ash for manufacturing of (1)-(9) any one of them for the method for soil conditioner, drying gained productionProduct arsenogen cellulose content≤5mg/kg；Rapid determination of content of cadmium element≤0.2mg/kg；Mercury element content≤0.1mg/kg；Lead element content≤50mg/kg；Chromium content≤100mg/kg；Copper coin cellulose content≤50mg/kg；Nickel element content≤50mg/kg；Zn-ef ficiency containsAmount≤50mg/kg；Selenium element content≤3.0mg/kg；Cobalt element content≤40mg/kg；Vanadium unit cellulose content≤130mg/kg；AntimonyConstituent content≤5mg/kg.
(11) according to the high-alkali coal ash for manufacturing of (1)-(10) any one of them for the method for soil conditioner, the drying instituteIt is 1-300m to obtain soil conditioner surface area2/ g, bulk density 0.4-2g/cm3, particle diameter distribution is 0.5-70 μm.
(12) according to the high-alkali coal ash for manufacturing of (1)-(11) any one of them for the method for soil conditioner, the product is answeredSoil is acid soil, exceeded heavy metal be one of the following or at least two arbitrary combination：Lead, nickel, cadmium, chromium, copper,Zinc, arsenic, antimony, mercury, cobalt, vanadium.
(13) according to the high-alkali coal ash for manufacturing of (1)-(12) any one of them for the method for soil conditioner, the product is answeredA concentration of 2mg/kg-10000mg/kg of heavy metal in soil.
(14) according to the high-alkali coal ash for manufacturing of (1)-(13) any one of them for the method for soil conditioner, the product is answeredApplied amount in heavy-metal contaminated soil is 0.1-500kg/m2。
(15) according to the high-alkali coal ash for manufacturing of (1)-(14) any one of them for the method for soil conditioner, the product is answeredEffect in heavy-metal contaminated soil is that heavy metal leaching concentration declines 1%-100%.
Advantageous effects of the present invention are：Flyash is large Industrial Solid Waste, and ontology content of beary metal is higher, cannotIt is applied in soil remediation directly as soil conditioner.In flyash forming process, part heavy metal element is a large amount of in flue gasIt is deposited on fine coal gray surface, forms condensate with sial element, the technique for removing flyash ontology heavy metal is cumbersome, alkali consumptionIt is high.The present invention is mixed in a certain ratio grinding by high-alkali flyash and solid base, is washed after heating, filters, and drying can reduceAlkali charge reaches more preferable effect.
The forming process of high-alkali flyash is similar with ordinary fly ash, and difference is in high-alkali flyash that there are a large amount of alkaliMetal, in high-alkali flyash forming process, alkalinity is stronger, and high-alkali this weight of flyash can be destroyed in boiler tail flue gasThe condensate that the sial element of metal and high-alkali fine coal gray surface is formed.Therefore can substantially reduce the energy consumption of subsequent technique, water consume andAlkaline consumption.
Specific implementation mode
Comparative example 1：
Take 1g ordinary fly ashes Z-1 and 50g Cd2+Contaminated soil ground and mixed, before HJ/T299-2007 standard testsCd afterwards2+Leaching concentration changes, and calculates leaching rate, as shown in table 1.
Comparative example 2：
Take 1g business 4A zeolites Z-2 and 50g Cd2+Contaminated soil ground and mixed, before HJ/T299-2007 standard testsCd2+ leaching concentrations change afterwards, calculate leaching rate, as shown in table 1.
Comparative example 3：
Take the high-alkali flyash Z-3 of 1g and 50g Cd2+Contaminated soil ground and mixed, before HJ/T299-2007 standard testsCd2+ leaching concentrations change afterwards, calculate leaching rate, as shown in table 1.
Comparative example 4：
It takes ordinary fly ash 5g to be ground with 10g sodium hydroxides, is heated to 120 degrees Celsius and is kept for 4 hours.It is used after taking out coolingDeionized water washing, filtering, drying, are labeled as Z-4.
Take 1g Z-4 samples and 50g Cd2+Contaminated soil ground and mixed, according to Cd before and after HJ/T299-2007 standard tests2+Leaching concentration changes, and calculates leaching rate, as shown in table 1.
Example 1：
It takes high-alkali flyash 5g to be ground with 5g sodium hydroxides, is heated to 100 degrees Celsius and is kept for 4 hours.It is used after taking out cooling20 degrees Celsius of deionized water washings, filtering, the drying of 50 degrees celsius, are labeled as Y-1.
Take 1gY-1 samples and 50g Cd2+Contaminated soil ground and mixed, according to Cd before and after HJ/T299-2007 standard tests2+Leaching concentration changes, and calculates leaching rate, as shown in table 1.
Example 2：
It takes high-alkali flyash 5g to be ground with 5g sodium hydroxides, is heated to 120 degrees Celsius of C and is kept for 2 hours.It is used after taking out cooling20 degrees Celsius of deionized water washings, filtering, the drying of 50 degrees celsius, are labeled as Y-2.
Take 1g Y-2 samples and 50g Cd2+Contaminated soil ground and mixed, according to Cd before and after HJ/T299-2007 standard tests2+Leaching concentration changes, and calculates leaching rate, as shown in table 1.
Example 3：
It takes high-alkali flyash 5g to be ground with 5g sodium hydroxides, is heated to 300 degrees Celsius and is kept for 2 hours.It is used after taking out cooling50 degrees Celsius of deionized water washings, filtering, the drying of 50 degrees celsius, are labeled as Y-3.
Take 1g Y-3 samples and 50g Cd2+ contaminated soil ground and mixed, according to Cd before and after HJ/T299-2007 standard tests2+Leaching concentration changes, and calculates leaching rate, as shown in table 1.
Example 4：
It takes high-alkali flyash 5g to be ground with 20g sodium hydroxides, is heated to 120 degrees Celsius and is kept for 2 hours.It is used after taking out cooling80 degrees Celsius of deionized water washings, filtering, the drying of 80 degrees celsius, are labeled as Y-4..
Take 1g Y-4 samples and 50g Cd2+Contaminated soil ground and mixed, according to Cd before and after HJ/T299-2007 standard tests2+Leaching concentration changes, and calculates leaching rate, as shown in table 1.
1 leaching effect of table compares
By the above example it is found that reach same treatment effect, in technique of the present invention, high-alkali flyashThe energy consumption of technique, alkaline consumption are lower.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this fieldFor art personnel, the present invention can have various changes and variation.All within the spirits and principles of the present invention, that is done any repaiiesChange, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.