CN108641723A - A kind of high-alkali coal ash for manufacturing for soil conditioner method - Google Patents
A kind of high-alkali coal ash for manufacturing for soil conditioner method Download PDFInfo
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- CN108641723A CN108641723A CN201810611290.1A CN201810611290A CN108641723A CN 108641723 A CN108641723 A CN 108641723A CN 201810611290 A CN201810611290 A CN 201810611290A CN 108641723 A CN108641723 A CN 108641723A
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- alkali
- soil conditioner
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/06—Calcium compounds, e.g. lime
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- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The present invention relates to a kind of high-alkali coal ash for manufacturing for the method for soil conditioner, which mixes with solid base by high-alkali flyash, grinds, washed after heating, filters, drying.Gained soil conditioner has the effect of heavy metal in stable soil, can be used for administering heavy metal pollution of soil.The technique has many advantages, such as that raw material is easy to get, flow is simple, alkali consumption is few compared with other techniques.
Description
Technical field
The present invention relates to a kind of high-alkali total utilization of PCA techniques, and energy is obtained by carrying out alkali process to high-alkali flyash
The soil conditioner of heavy metal, belongs to inorganic chemistry and field of chemical engineering in stable soil.
Technical background
Flyash refers to the fine ash trapped from coal-burning boiler tail flue gas, is that the primary solids of coal-burning power plant's discharge are useless
Object.With the development of power industry, the flyash discharge capacity of coal-burning power plant increases year by year, flyash become the current discharge capacity in China compared with
One of big industrial residue.
The quasi- east area in Xinjiang is expected coal reserves up to 3.9 × 1011T is Chinese maximum self-contained coalfield at present.Quasi- east coal is made
For a kind of low-order coal, reactivity is good, easily after-flame and development cost is low, but due in coal alkali metal content be generally higher than China
Other regional steam coals；With the foundation of the quasi- super-huge coal-electricity base in east, high-alkali utilization of fly ash becomes urgently to be resolved hurrily and asks
Topic.The characteristics of high-alkali flyash is alkali metal content height, and it is bad to will appear the accumulation of salt in the surface soil, embrittlement etc. applied to construction material manufacture field
Phenomenon such as stacks, then can waste land resource, cause damages to air and underground water on the spot.
China Central China and South China face serious acid soil heavy metal pollution problem at present, easily cause agricultural product
And underground water content of beary metal is exceeded, endangers resident's health.It is sieve and silica-sesquioxide and alkali gold that high-alkali flyash, which mainly forms,
Belong to, can sweetening of the soil it is acid, excited by furnace high-temperature in high-alkali flyash forming process, make it have strong ion exchangeable
Energy.
It there is no the technical solution that soil conditioner is prepared using high-alkali flyash as primary raw material in the prior art.
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 heating
The 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 is
High-alkali flyash and solid base are mixed in a certain ratio grinding, washed after heating, is filtered, drying, gained soil conditioner tool
The 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 Application
Value.
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 less
Alkali 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 proportion
Have 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 leaching
Content 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 boiler
The fine ash collected by cleaner in tail flue gas, wherein alkali metal mass percent 2%-20%, silicon mass percent
10%-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 area
For 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 with
The 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 from
0.1-72h。
(5) according to the high-alkali coal ash for manufacturing of (1)-(4) any one of them for soil conditioner method, high-alkali flyash with
The 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 temperature
Ranging 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 packet
Include following one or at least two arbitrary combination：Sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, potassium carbonate, carbonic acid
Hydrogen 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 them
PH 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 gained
Soil 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 production
Product 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 contains
Amount≤50mg/kg；Selenium element content≤3.0mg/kg；Cobalt element content≤40mg/kg；Vanadium unit cellulose content≤130mg/kg；Antimony
Constituent 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 institute
It 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 answered
Soil 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 answered
A 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 answered
Applied 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 answered
Effect 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, cannot
It is applied in soil remediation directly as soil conditioner.In flyash forming process, part heavy metal element is a large amount of in flue gas
It is deposited on fine coal gray surface, forms condensate with sial element, the technique for removing flyash ontology heavy metal is cumbersome, alkali consumption
It 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 reduce
Alkali 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 alkali
Metal, in high-alkali flyash forming process, alkalinity is stronger, and high-alkali this weight of flyash can be destroyed in boiler tail flue gas
The 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 and
Alkaline 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 tests
Cd 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 tests
Cd2+ 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 tests
Cd2+ 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 cooling
Deionized 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 cooling
20 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 cooling
20 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 cooling
50 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 cooling
80 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 flyash
The 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 field
For 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 repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of high-alkali coal ash for manufacturing is for the method for soil conditioner, it is characterised in that：High-alkali flyash is mixed with solid base
Grinding, is washed after heating, is filtered, and soil conditioner is made in drying.
2. high-alkali coal ash for manufacturing according to claim 1 is for the method for soil conditioner, it is characterised in that：High-alkali flyash
Refer to the fine ash collected by cleaner in coal-burning boiler tail flue gas, wherein alkali metal mass percent 2%-20%, silicon
Mass percent 10%-50%, calcium mass percent 1%-20%.
3. high-alkali coal ash for manufacturing according to claim 1 is for the method for soil conditioner, it is characterised in that：High-alkali flyash
Surface area is 1-50m2/ g, bulk density 0.8-2g/cm3, particle diameter distribution is 0.5-30 μm.
4. high-alkali coal ash for manufacturing according to claim 1 is for the method for soil conditioner, it is characterised in that：High-alkali flyash
Ranging from the mass ratio of solid base：1：0.05-1：5, temperature ranges are：50-800 DEG C, processing time ranging from 0.1-
72h。
5. high-alkali coal ash for manufacturing according to claim 1 is for the method for soil conditioner, it is characterised in that：Lapping mode packet
Include following one or at least two arbitrary combination：Mechanical quickly stirring, is milled at ball milling.
6. high-alkali coal ash for manufacturing according to claim 1 is for the method for soil conditioner, it is characterised in that：Grinding heating
Afterwards, through washing, filtering, drying, powdered soil conditioner product is obtained；The washing temperature is ranging from：0.1 degree Celsius -80
Degree Celsius；Drying temperature is ranging from：30 degrees Celsius -120 degrees Celsius.
7. high-alkali coal ash for manufacturing according to claim 4 is for the method for soil conditioner, it is characterised in that：The solid base
Arbitrary combination including following one or at least two：Sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, potassium carbonate, carbon
Potassium hydrogen phthalate, ammonium hydrogen carbonate, ammonium carbonate.
8. high-alkali coal ash for manufacturing according to claim 6 is for the method for soil conditioner, it is characterised in that：Drying gained production
Product pH value range is：8-12.
9. high-alkali coal ash for manufacturing according to claim 6 is for the method for soil conditioner, it is characterised in that：Drying gained production
Product alkali metal mass percent is 1%-20%, and silicon mass percent is 10%-50%, and calcium mass percent is 1%-20%.
10. high-alkali coal ash for manufacturing according to claim 6 is for the method for soil conditioner, it is characterised in that：Drying gained
Product 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 contains
Amount≤50mg/kg；Selenium element content≤3.0mg/kg；Cobalt element content≤40mg/kg；Vanadium unit cellulose content≤130mg/kg；Antimony
Constituent content≤5mg/kg.
11. high-alkali coal ash for manufacturing according to claim 6 is for the method for soil conditioner, it is characterised in that：Soil conditioning
Agent product table area is 1-300m2/ g, bulk density 0.4-2g/cm3, particle diameter distribution is 0.5-70 μm.
12. high-alkali coal ash for manufacturing according to claim 6 is for the method for soil conditioner, it is characterised in that：Products application
Soil be 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. high-alkali coal ash for manufacturing according to claim 12 is for the method for soil conditioner, it is characterised in that：Products application
A concentration of 2mg/kg-10000mg/kg of heavy metal in soil.
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| CN201810611290.1A CN108641723B (en) | 2018-06-14 | 2018-06-14 | Method for preparing soil conditioner from high-alkali fly ash |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110606790A (en) * | 2019-09-12 | 2019-12-24 | 北京康地宝生物技术有限公司 | Soil improvement repairing agent and preparation method thereof |
| CN111704905A (en) * | 2020-06-18 | 2020-09-25 | 韶关学院 | Soil remediation agent and preparation method and application thereof |
| CN112111282A (en) * | 2020-09-16 | 2020-12-22 | 国家能源集团宁夏煤业有限责任公司 | Soil conditioner, application thereof and soil conditioning and/or soil remediation method |
| CN112279714A (en) * | 2020-10-09 | 2021-01-29 | 赢享(宁夏)管理咨询有限公司 | Method for preparing fly ash fertilizer capable of preventing heavy metal from polluting soil |
| CN114540037A (en) * | 2022-03-11 | 2022-05-27 | 南昌大学 | Preparation method of modified fly ash-based soil conditioner |
| CN114644928A (en) * | 2022-04-12 | 2022-06-21 | 中国环境科学研究院 | Process for producing and processing soil conditioner by taking fly ash as raw material |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110606790A (en) * | 2019-09-12 | 2019-12-24 | 北京康地宝生物技术有限公司 | Soil improvement repairing agent and preparation method thereof |
| CN111704905A (en) * | 2020-06-18 | 2020-09-25 | 韶关学院 | Soil remediation agent and preparation method and application thereof |
| CN112111282A (en) * | 2020-09-16 | 2020-12-22 | 国家能源集团宁夏煤业有限责任公司 | Soil conditioner, application thereof and soil conditioning and/or soil remediation method |
| CN112111282B (en) * | 2020-09-16 | 2021-08-17 | 国家能源集团宁夏煤业有限责任公司 | Soil conditioner, application thereof and soil conditioning and/or soil remediation method |
| CN112279714A (en) * | 2020-10-09 | 2021-01-29 | 赢享(宁夏)管理咨询有限公司 | Method for preparing fly ash fertilizer capable of preventing heavy metal from polluting soil |
| CN114540037A (en) * | 2022-03-11 | 2022-05-27 | 南昌大学 | Preparation method of modified fly ash-based soil conditioner |
| CN114644928A (en) * | 2022-04-12 | 2022-06-21 | 中国环境科学研究院 | Process for producing and processing soil conditioner by taking fly ash as raw material |
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| CN108641723B (en) | 2020-09-11 |
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