CN109652081A - A kind of preparation method of acidic soil conditioner - Google Patents
A kind of preparation method of acidic soil conditioner Download PDFInfo
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- CN109652081A CN109652081A CN201910069890.4A CN201910069890A CN109652081A CN 109652081 A CN109652081 A CN 109652081A CN 201910069890 A CN201910069890 A CN 201910069890A CN 109652081 A CN109652081 A CN 109652081A
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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
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- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention discloses a kind of preparation methods of acidic soil conditioner, to harden gel in discarded concrete as raw material, acidic soil conditioner is obtained through grinding, calcining and dry method high-energy ball milling, this method is simple and easy, technique and appointed condition require low, it is easy to accomplish large-scale industrial production.Obtained acidic soil conditioner porosity is high, partial size is small, alkali dissolving out capability with higher, the calcium content and pH value in acid soil can be effectively improved, reduce the exchangeable aluminum content of acid soil, improve the quality of acid soil, the growth for promoting microbial populations in soil breeding and crops, provides new approaches for sustainable development of agricultural production.The present invention improves the economic value added that gel is hardened in discarded concrete, also for acidic soil conditioner provide it is a kind of it is from a wealth of sources, yield is huge, it is cheap and easy to get, can have wide development and application prospect with the environmentally protective new material of large-scale use.
Description
Technical field
The present invention relates to technical field of mineral processing, in particular to a kind of preparation method of acidic soil conditioner.
Background technique
In past 40 years, due to the fast development of Industrial-Enterprises in China, acidic gas in air content quickly increases
Add, after it is deposited in soil in the form of acid rain, will result in the pH value decline of soil, cause the acidification of soil.According to system
Meter, has averagely had dropped 0.13 ~ 0.80 unit less than half a century China's agricultural land soil pH value.The decline of soil pH can weaken
Ca in soil, Mg, the binding force of the nutrients such as K, Fe and soil are made to cause the loss of Nutrient Elements in Soil
At soil depletion.Meanwhile soil acidification will lead in soil the aluminium ion in stable state originally and heavy metal activity improve and
This process can enhance with the amplitude that soil pH declines, and the aluminium ion and heavy metal ion dissolved out in soil can be in plant
Interior enrichment, so that the normal growth to plant impacts, while may also can be by food chain the heavy metal member being enriched with
Element is gathered in human body, is threatened to human health.Furthermore the reduction of soil pH value can change the life of Soil Microorganism
Environment inhibits microbial populations in soil breeding, so that the circulation of the nutrients such as decomposition and the nitrogen phosphorus of soil with organic matter is influenced,
So as to cause crop production reduction, sustainable development of agricultural production seriously restrict；In addition the transition in China's agricultural production process
Acid chemical fertilizer is relied on, so that above situation becomes more serious.It is received extensively for this purpose, carrying out effective improvement to acid soil
Concern.
During acid soil improvement, mugineic acid soil conditioner is using most effective and widely accepted side
Method.Acid soil improving agent has quick lime, agstone, biological carbon, crops stem, Animal manure and plant ash etc. at present.
Wherein since soil aciditiy can be significantly reduced in the alkaline matter contained in lime and agstone, it is total to improve soil base cations
Amount increases interchangeability calcium in soil, content of magnesium, the content of exchangeable aluminum is effectively reduced thus has obtained relatively broad research
And application.The organic substances such as biological carbon, crops stem, Animal manure and plant ash make because can improve the environment of soil
The type and activity of edaphon increase, and reduce the content of rock picker, eliminate the toxic action of aluminium, and containing big
The nutritional ingredient of amount is also by more and more extensive attention.But during acid soil improvement, acid soil regulator per acre
Amount of application often exceed hundred kilograms, therefore need to exploit and calcine a large amount of natural limestone resource or the improvement of other organic matter classes
Agent.On the one hand, this can undoubtedly increase considerably the cost of soil improvement, while will also result in new environmental pollution and the energy and disappearing
Consumption.For example, by taking the most common acid soil improving agent lime stone of application or quick lime as an example, although lime stone be a kind of reserves compared with
The exhaustion that mineral resources abundant, but since it is with non-renewable, a large amount of exploitation and consumption not only result in resource is same
When will also result in the catastrophic collapse of massif and vegetation, so that soil erosion, biomass and bio-diversity be caused to reduce.So
It develops newly, abundance, environmental-friendly acid soil regulator is of great significance.
A large amount of building waste can be generated in the construction industries activity such as the construction of building or structures, finishing, removal, and
With the quickening of China's infrastructure quickly propelled with urbanization rate, building waste yield continues to increase.China is annual
The yield of building waste accounts for the 30% ~ 40% of municipal refuse total amount.It has been reached according to ASSOCIATE STATISTICS China's building waste yield in 2017
To 23.79 hundred million tons, 2.97 hundred million tons compared with 2001 increase nearly as many as 7 times.It is sent out simultaneously according to house and town and country construction portion
The most recent layout of cloth will also create 30,000,000,000 square metres of houses to the year two thousand twenty China, and resulting building waste is at least up to 50
Hundred million tons.Building waste does not only take up a large amount of valuable arable lands, while itself and the water phase in ambient enviroment during accumulation and landfill
Interaction, percolate will cause the pollution of surface water or underground water.Discarded concrete is the important component of building waste,
Account for about the 34% of building waste total amount.Not only land occupation resource also causes certain journey to environment for its a large amount of accumulation and landfill
The pollution of degree, so carrying out effective resource utilization to it is always the technology neck that national and local governments are advocated and encouraged
Domain.And China's discarded concrete resource utilization rate is less than 5%.The main resource utilization ways of discarded concrete are at present
Aggregate of recycled concrete is prepared, but a large amount of hardening gel fine powders can be generated in broken and screening process, since its is higher
Porosity and water absorption rate and make recycled aggregate mechanical properties decrease compared with low-intensity, regeneration concrete workability is deteriorated, hardening
Volume stability deteriorates afterwards.Recycled aggregate is prepared so largely hardening gel in discarded concrete and becoming restriction discarded concrete
Principal element.Opposite to the research of utilization for hardening gel in discarded concrete at present to lack, only research is big
Focus mostly on preparation the field of building materials, such as prepare building block or again pre-burned for cement etc..But it is hard due to what is discarded
It is big to change gel fine powder porosity, marks that thick water requirement is high, activity index is low, all there is limit doped amount in use, uses it
The building material product workability and mechanical property of preparation are poor.Simultaneously because the gelled matrix separated from discarded concrete contains
A certain amount of inertia silica, this pre-burning also to cement raw grinding and clinker bring difficulty, make f-CaO content in clinker
Increase, clinker quality decline, increased production cost.
Summary of the invention
In view of the above shortcomings of the prior art, the object of the present invention is to provide a kind of preparations of acidic soil conditioner
Method solves to make in existing acidic soil conditioner preparation method using natural crystal or artificial synthesized reagent as main raw material(s)
At the at high cost and big problem of environmental loads, while new Technology Ways are provided for the higher value application of discarded concrete.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions: a kind of acidic soil conditioner
Preparation method, comprising the following steps:
1) hardening gel fine powder is stirred evenly with carbon dust, obtains mixture, then the mixture is transferred in nodulizer,
Water and sodium silicate aqueous solution are added in nodulizer rotation process, when the diameter of pellet is less than or equal to 5mm outside discharge ball disk；
2) it after the pellet drying obtained step 1), is put into Muffle furnace and is calcined, is cooled to room temperature, then by the pellet
Carry out dry method high-energy ball milling, control discharging-material size less than 5000 mesh, then by its vacuum drying to get arrive the acid soil tune
Manage agent.
In this way, due to discarded concrete hardening gel fine powder in joined carbon dust be granulated after, under the high temperature conditions into
When row calcining, the burned carbon dioxide formed of one side carbon dust is escaped from pellet forms flourishing porous structure；It is another
It is solidifying that sodium silicate solution added by aspect can harden hydrated calcium silicate contained in gel with discarded concrete at this temperature
Sintering reaction occurs together for glue, forms the higher Silicon-rich skeleton of mechanical strength, pellet will not be made to be formed because carbon dioxide escapes
Porous structure and collapse.In addition, the porous structure being stabilized in pellet, reduce pellet neutral and alkali substance dissolution resistance and
Difficulty is dissolved out, and then improves calcium dissolution efficiency.
Further, the hardening gel fine powder is prepared by the following method:
S1: being crushed to particle of the partial size less than 10 mm for discarded concrete, then by the particle at 500 ~ 800 DEG C at pre-burning
After managing 10 ~ 30min, it is cooled to room temperature；
S2: the particle after step 1) preheating is crushed and is separated in electromagnetic type concussion pulverizer, then is used
60 ~ 325 meshes are sieved, and are collected screenings and are obtained subparticle；
S3: by the subparticle grinding, and specific surface area >=400m of milling body is controlled out2/ kg, then by the powder into
Row arrives the hardening gel fine powder except iron processing.
Discarded concrete through broken, pre-burning, crush separation and grinding screening and etc. obtain small hardening gel fine powder,
It eliminates the larger coarse aggregate of partial size and hardens the big particle in gel.It is certain due to containing in gel in discarded concrete
The presence of the siliceous component of amount, said components will reduce effective calcareous constituent content that gel is hardened in discarded concrete.With
Calcareous component contained in hardening gel is compared, since siliceous component has the characteristics of hardness is high, non-breakable and grinding,
So calcareous component is broken with grinding to thinner degree in above-mentioned broken and grinding process, and siliceous component is still with phase
Exist to biggish particle, above-mentioned siliceous particles can be effectively removed after screened selection subparticle, to improve in powder
Effective calcareous constituent content.
Pre-burning is carried out at a temperature of 500 ~ 600 DEG C, curable paste on the one hand can be made to coagulate body and quickly lost under high temperature action
In conjunction with water, shrinkage stress is generated, will be generated after generated shrinkage stress is more than the tensile strength of hardening gel itself
A large amount of microfissures, and then hardening gel can be isolated from discarded concrete；The discarded coagulation that still further aspect can make
Carbon dioxide and water evolution that gel is combined are hardened in soil improves the hardening molten calcium performance of gel to increase porosity.
Further, the mass ratio of the powder and carbon dust is 10 ~ 20:1.
Further, the mass ratio of the mixture, water and sodium silicate aqueous solution is 90 ~ 96:2 ~ 5:2 ~ 5；The sodium metasilicate
The mass concentration of aqueous solution is 30% ~ 40%.
Further, the calcining is to be warming up to 700 DEG C ~ 900 DEG C with the heating rate of 5 DEG C/min, and heated at constant temperature 10 ~
30min。
Further, shaking frequency is 600 ~ 1200 beats/min in the dry method high-energy ball milling, and Ball-milling Time is 1 ~ 5h.
Further, the mass ratio of pellet and abrasive media is 1:2 ~ 1:3 when the dry method high-energy ball milling；The abrasive media
For agate ball.
In dry method Process During High Energy Ball Milling, prepared pellet is by the abrasive media impact several times of high-speed motion and pulverizes,
So that the pellet being put into is become progressively smaller until micron level, subsequent powder neutral and alkali material surface generates a series of key fracture,
Lattice generates defect, and then defect constantly expands, therefore prepared acidic soil conditioner can be further enhanced after ball milling
Alkali dissolving out capability, and then enhance the using effect of prepared acid soil regulator.
Further, the drying temperature is 90 ~ 120 DEG C, and the time is 2 ~ 6h.
The application for the acidic soil conditioner that above-mentioned preparation method obtains, by the acidic soil conditioner with the side of base manure
Formula is applied in acid soil, and amount of application is 100 ~ 200kg/ mus.
Compared with prior art, the invention has the following beneficial effects:
1, the present invention is obtained using the hardening gel in discarded concrete as raw material through grinding, calcining and dry method high-energy ball milling
Acidic soil conditioner, simple for process, at low cost, appointed condition requires low, it is easy to accomplish large-scale industrial production,
Obtained acidic soil conditioner porosity is high, partial size is micron level, reduces dissolution resistance and the dissolution of its alkaline matter
Difficulty improves calcium dissolution efficiency and alkali dissolving out capability, to reduce the content of the exchangeable aluminum of acid soil, improves acid soil
Calcium content and pH value in earth effectively improve the quality of acid soil, promote microbial populations in soil breeding and crops
Growth provide new approaches to improve the yield of crops for sustainable development of agricultural production.
2, raw materials of the present invention are the hardening gel separated in discarded concrete, from a wealth of sources, low in cost,
This provides a new approach to harden the resource utilization of gel in flood tide discarded concrete；Also it is improved for acid soil
Agent provide it is a kind of it is from a wealth of sources, yield is huge, it is environmental-friendly, cheap and easy to get, with large-scale use and national correlation can be met
The environmentally protective new material of support policy has wide development and application prospect.
3, the technical application of hardening gel this building castoff in discarded concrete is widened acidity by the present invention
Soil remediation field improves the economic value added of discarded hardening gel.It utilizes in discarded concrete simultaneously and hardens gel
Preparing acidic soil conditioner, there is no limit doped amount problems, improve the resource utilization efficiency of hardening gel, overcome
Its high porosity, high water absorbing capacity, low strong during preparing regeneration concrete material, building block or calcination of cement clinker again
Degree, volume are limited etc. the problem of bringing.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
One, the preparation method of acidic soil conditioner
Embodiment 1
1) discarded concrete is chosen from building waste, use small-sized hammer mill carry out just it is broken and control discharging-material size≤
10mm, through just it is broken after discarded concrete be fitted into corundum crucible and be put into chamber type electric resistance furnace under different temperature schedules into
Row pre-burning, control calcined temperature are 500 DEG C；It is taken out after furnace temperature cools to 100 DEG C or less, by it in electromagnetism after being cooled to room temperature
It is crushed and is separated in formula concussion pulverizer, and controlling concussion grinding time is that 3 ~ 10s pours into 60 mesh sides after concussion separation
In hole sizer, the separation of coarse aggregate and fine powder in discarded concrete is carried out by screening, the coarseer aggregate of partial size is trapped in square hole
On sieve, the lesser discarded concrete fine powder of partial size then passes through sieve pore as screenings, and collects the subparticle of sieving up to hard
Change gel.
Since above-mentioned preparation process is using discarded concrete as raw material, and the coarseer aggregate of wherein partial size is eliminated, therefore
Above-mentioned subparticle is mainly the hardening gel in discarded concrete, essential mineral group become hydrated calcium silicate gel and its
Due to long-time stored up under atmospheric environment be carbonized by Carbon Dioxide in Air after be formed by carbonized product, and be partially separated not
Complete silica.Its chemical composition is SiO2: 10% ~ 50%, CaO:20% ~ 50%, Fe2O3: 1%-5%, Al2O3: 1%-
5%, Na2O:0.1% ~ 1%, K2O: 0.1%~1%, MgO: 0.1%~1%。
2) the hardening gel of acquisition is subjected to grinding processing using ball mill, control grinding time is 20min, grinding knot
Shu Hou, according to method and steps specified in GB8074-2008 " Method of determination for specific surface of cement Bo Shi method ", using Bo Shi ratio
Surface Area Analyzer carries out specific area measuring to the sample after grinding, and controls out specific surface area >=400m of milling body2/
Kg carries out iron removal by magnetic separation for the first time using dry type iron remover after grinding, removes the ferromagnetic material in powder.
3) powder and carbon dust are put into the revolving speed in high speed mixer with 200rpm according to the ratio ingredient of mass ratio 10:1
Be stirred 20 ~ 30min, draw off after mixing, obtain mixture, and the mixture is transferred in nodulizer, at
Addition water and concentration are 30% sodium silicate aqueous solution in ball machine rotation process, wherein the matter of mixture, water and sodium silicate aqueous solution
Amount is than being 90:5:5, when the diameter of pellet is less than or equal to 5mm outside discharge ball disk.
4) by above-mentioned pellet in constant temperature blast drying oven with 105 DEG C of drying 2h, the pellet after drying is put into Muffle furnace
In, 700 DEG C, and heated at constant temperature 10min are warming up to the heating rate of 5 DEG C/min, taken out from furnace after natural cooling.
5) pellet for obtaining step 4) is put into progress dry method high-energy ball milling, ball milling in jarring formula high energy ball mill ball grinder
The mass ratio for controlling pellet and agate ball in the process is 1:2, and shaking frequency is 600 beats/min, High Energy Ball Milling Time 1h, when
It is drawn off when discharging-material size is less than 5000 mesh, and under vacuum conditions by the material drawn off, 105 DEG C are dried to get acidity is arrived
Soil conditioner.
Embodiment 2
1) discarded concrete is chosen from building waste, use small-sized hammer mill carry out just it is broken and control discharging-material size≤
10mm, through just it is broken after discarded concrete be fitted into corundum crucible and be put into chamber type electric resistance furnace under different temperature schedules into
Row pre-burning, control calcined temperature are 550 DEG C；It is taken out after furnace temperature cools to 100 DEG C or less, by it in electromagnetism after being cooled to room temperature
It is crushed and is separated in formula concussion pulverizer, and controlling concussion grinding time is that 3 ~ 10s pours into 200 mesh sides after concussion separation
In hole sizer, the separation of coarse aggregate and fine powder in discarded concrete is carried out by screening, the coarseer aggregate of partial size is trapped in square hole
On sieve, the lesser discarded concrete fine powder of partial size then passes through sieve pore as screenings, and collects the subparticle of sieving up to hard
Change gel.
Since above-mentioned preparation process is using discarded concrete as raw material, and the coarseer aggregate of wherein partial size is eliminated, therefore
Above-mentioned subparticle is mainly the hardening gel in discarded concrete, essential mineral group become hydrated calcium silicate gel and its
Due to long-time stored up under atmospheric environment be carbonized by Carbon Dioxide in Air after be formed by carbonized product, and be partially separated not
Complete silica.Its chemical composition is SiO2: 10% ~ 50%, CaO:20% ~ 50%, Fe2O3: 1%-5%, Al2O3: 1%-
5%, Na2O:0.1% ~ 1%, K2O: 0.1%~1%, MgO: 0.1%~1%。
2) the hardening gel of acquisition is subjected to grinding processing using ball mill, control grinding time is 30min, grinding knot
Shu Hou, according to method and steps specified in GB8074-2008 " Method of determination for specific surface of cement Bo Shi method ", using Bo Shi ratio
Surface Area Analyzer carries out specific area measuring to the sample after grinding, and controls out specific surface area >=400m of milling body2/
Kg carries out iron removal by magnetic separation for the first time using dry type iron remover after grinding, removes the ferromagnetic material in powder.
3) it by powder and carbon dust according to mass ratio 15:1 ingredient, is put into mixed with the revolving speed stirring of 300rpm in high speed mixer
20 ~ 30min is closed, draws off after mixing, obtains mixture, and the mixture is transferred in nodulizer, is turned in nodulizer
Water and concentration are added during dynamic as 35% sodium silicate aqueous solution, the mass ratio of mixture, water and sodium silicate aqueous solution is 94:
5:3, when the diameter of pellet is less than or equal to 5mm outside discharge ball disk.
4) by above-mentioned pellet in constant temperature blast drying oven with 105 DEG C of drying 4h, the pellet after drying is put into Muffle furnace
In, 800 DEG C, and heated at constant temperature 20min are warming up to the heating rate of 5 DEG C/min, taken out from furnace after natural cooling.
5) pellet for obtaining step 4) is put into progress dry method high-energy ball milling, ball milling in jarring formula high energy ball mill ball grinder
The mass ratio for controlling pellet and agate ball in the process is 1:2.5, and shaking frequency is 900 beats/min, High Energy Ball Milling Time 3h,
It is drawn off when discharging-material size is less than 5000 mesh, and under vacuum conditions by the material drawn off, 105 DEG C are dried to get acid is arrived
Property soil conditioner.
Embodiment 3
1) discarded concrete is chosen from building waste, use small-sized hammer mill carry out just it is broken and control discharging-material size≤
10mm, through just it is broken after discarded concrete be fitted into corundum crucible and be put into chamber type electric resistance furnace under different temperature schedules into
Row pre-burning, control calcined temperature are 800 DEG C；It is taken out after furnace temperature cools to 100 DEG C or less, by it in electromagnetism after being cooled to room temperature
It is crushed and is separated in formula concussion pulverizer, and controlling concussion grinding time is that 3 ~ 10s pours into 325 mesh sides after concussion separation
In hole sizer, the separation of coarse aggregate and fine powder in discarded concrete is carried out by screening, the coarseer aggregate of partial size is trapped in square hole
On sieve, the lesser discarded concrete fine powder of partial size then passes through sieve pore as screenings, and collects the subparticle of sieving up to hard
Change gel.
Since above-mentioned preparation process is using discarded concrete as raw material, and the coarseer aggregate of wherein partial size is eliminated, therefore
Above-mentioned subparticle is mainly the hardening gel in discarded concrete, essential mineral group become hydrated calcium silicate gel and its
Due to long-time stored up under atmospheric environment be carbonized by Carbon Dioxide in Air after be formed by carbonized product, and be partially separated not
Complete silica.Its chemical composition is SiO2: 10% ~ 50%, CaO:20% ~ 50%, Fe2O3: 1%-5%, Al2O3: 1%-
5%, Na2O:0.1% ~ 1%, K2O: 0.1%~1%, MgO: 0.1%~1%。
2) the hardening gel of acquisition is subjected to grinding processing using ball mill, control grinding time is 40min, grinding knot
Shu Hou, according to method and steps specified in GB8074-2008 " Method of determination for specific surface of cement Bo Shi method ", using Bo Shi ratio
Surface Area Analyzer carries out specific area measuring to the sample after grinding, and controls out specific surface area >=400m of milling body2/
Kg carries out iron removal by magnetic separation for the first time using dry type iron remover after grinding, removes the ferromagnetic material in powder.
3) it by powder and carbon dust according to mass ratio 20:1 ingredient, is put into mixed with the revolving speed stirring of 500rpm in high speed mixer
20 ~ 30min is closed, draws off after mixing, obtains mixture, and the mixture is transferred in nodulizer, is turned in nodulizer
Water and concentration are added during dynamic as 40% sodium silicate aqueous solution, the mass ratio of control mixture, water and sodium silicate aqueous solution is
96:2:2, when the diameter of pellet is less than or equal to 5mm outside discharge ball disk.
4) by above-mentioned pellet in constant temperature blast drying oven with 105 DEG C of drying 6h, the pellet after drying is put into Muffle furnace
In, 900 DEG C, and heated at constant temperature 30min are warming up to the heating rate of 5 DEG C/min, taken out from furnace after natural cooling.
5) pellet for obtaining step 4) is put into progress dry method high-energy ball milling, ball milling in jarring formula high energy ball mill ball grinder
The mass ratio for controlling pellet and agate ball in the process is 1:3, and shaking frequency is 1200 beats/min, High Energy Ball Milling Time 5h, when
It is drawn off when discharging-material size is less than 5000 mesh, and under vacuum conditions by the material drawn off, 105 DEG C are dried to get acidity is arrived
Soil conditioner.
Two, the application of the preparation method of acidic soil conditioner
It is tested in the rice field of certain clay matter, medium fertility acid soil (pH value 5.4), randomly selects 6 pieces of areas
For 40m2Rectangle experimental field, the protection row of 2m or more is stayed around experimental plot, minizone does the isolation ridge of 20cm wide, uses plastics
Film spreads the ridge, prevents string fertilizer.
Select same seedbed ad eundem rice seedling transplanting in experimental field, and same amount of water is transplanted in every piece of experimental plot
Rice sprouts.Three pieces of experimental fields are randomly selected, as experimental group, in addition three pieces of experimental fields are as a control group.Experimental group application is implemented
Acidic soil conditioner prepared by example 1, is applied in a manner of base manure according to 100 ~ 200kg/ mus of amount of application；Control group is not applied
Soil conditioner, and keep other conditions constant, experimental group and control group are applied fertilizer, sprayed and are irrigated simultaneously, and dosage
It is all the same.
Respectively after rice seedling transplanting when two weeks, 1 month and two months to the soil in the rice field of experimental group and control group
Earth is sampled in a manner of quartering, is analyzed after air-drying and sieving, the results are shown in Table 1.
Table 1
The results show that compared with the control group, experimental group rice seedling transplanting after two weeks, 1 month and soil after two months
The pH value of sample is all significantly improved, and pH value averagely improves about 0.5 unit, and compared with the control group, experimental group soil exchangeable
Aluminium content in turn reduces about 23.0.%, 46.3% and 36.9%,；Simultaneously in experimental group rice field commutative calcium containing in turn increasing
23.7%, 30.8% and 28.9%.It can be seen that soil conditioner prepared by the present invention improves acid soil to a certain extent
In calcium content, indispensable nutriment is provided for plant, and effectively increase the soil pH value of acid soil,
The content for reducing the exchangeable aluminum of acid soil, is more advantageous to the growth of plant, therefore acidic soil conditioner effectively improves
The quality of acid soil, and then can effectively promote the yield of crop.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not limitation with the present invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of preparation method of acidic soil conditioner, which comprises the following steps:
1) hardening gel fine powder is stirred evenly with carbon dust, obtains mixture, then the mixture is transferred in nodulizer,
Water and sodium silicate aqueous solution are added in nodulizer rotation process, when the diameter of pellet is less than or equal to 5mm outside discharge ball disk；
2) it after the pellet drying obtained step 1), is put into Muffle furnace and is calcined, is cooled to room temperature, then by the pellet
Carry out dry method high-energy ball milling, control discharging-material size less than 5000 mesh, then by its vacuum drying to get arrive the acid soil tune
Manage agent.
2. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that the hardening gel fine powder
It is prepared by the following method:
S1: being crushed to particle of the partial size less than 10 mm for discarded concrete, then by the particle at 500 ~ 800 DEG C at pre-burning
After managing 10 ~ 30min, it is cooled to room temperature；
S2: the particle after step 1) preheating is crushed and is separated in electromagnetic type concussion pulverizer, then is used
60 ~ 325 meshes are sieved, and are collected screenings and are obtained subparticle；
S3: by the subparticle grinding, and specific surface area >=400m of milling body is controlled out2/ kg, then by the powder into
Row arrives the hardening gel fine powder except iron processing.
3. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that the hardening gel fine powder
Mass ratio with carbon dust is 10:1 ~ 20:1.
4. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that the mixture, water and silicon
The quality of acid sodium aqueous solution is 90 ~ 96:2 ~ 5:2 ~ 5.
5. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that the sodium silicate aqueous solution
Concentration is 30% ~ 40%.
6. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that it is described calcining be with 5 DEG C/
The heating rate of min is warming up to 700 DEG C ~ 900 DEG C, and 10 ~ 30min of heated at constant temperature.
7. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that in the dry method high-energy ball milling
Shaking frequency is 600 ~ 1200 beats/min, and Ball-milling Time is 1 ~ 5h.
8. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that when the dry method high-energy ball milling
The mass ratio of pellet and abrasive media is 1:2 ~ 3.
9. the preparation method of acidic soil conditioner according to claim 1, which is characterized in that the drying temperature be 90 ~
120 DEG C, the time is 2 ~ 6h.
10. such as the application for the acidic soil conditioner that any one of claim 1 ~ 9 preparation method obtains, which is characterized in that
The acidic soil conditioner is applied in acid soil in a manner of base manure, amount of application is 100 ~ 200kg/ mus.
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