CN105906454B - A kind of method of heavy metal validity in reduction compost - Google Patents
A kind of method of heavy metal validity in reduction compost Download PDFInfo
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- CN105906454B CN105906454B CN201610190491.XA CN201610190491A CN105906454B CN 105906454 B CN105906454 B CN 105906454B CN 201610190491 A CN201610190491 A CN 201610190491A CN 105906454 B CN105906454 B CN 105906454B
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D5/00—Fertilisers containing magnesium
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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Abstract
The invention discloses a kind of methods for reducing heavy metal validity in compost, and using chicken manure as composting material, it is 25 30 that sawdust or rice bran adjusting raw material C/N ratios are added in into raw material：1, raw material pH6.5 7.5 is adjusted, moisture control is 50 60%, then adds in into raw material and to account for the heavy metal deactivator of raw material weight in wet base 1 5% and be uniformly mixed, using slot type aerobic composting fermentation mode compost fermentation.The present invention is simple and practicable, carries out compost fermentation using specific heavy metal deactivator, can significantly reduce heavy metal validity in compost, and can shorten the compost time, improve dehydration rate, reduces nitrogen loss.
Description
Technical field
The present invention relates to a kind of compost method, more particularly to a kind of method for reducing heavy metal validity in compost.
Background technology
A large amount of uses of feed addictive in the development of modern large-scale cultivation industry make farm animal excrement be supported with tradition dispersion
The feces of livestock and poultry grown has larger change in ingredient, property etc., cultivates in source organic fertilizer because of high sodium and heavy metal
Harmful substance remains, and farmland may be polluted.In view of the composition transfer of organic fertilizer, the current feces of livestock and poultry resource in China
Change using scientific and reasonable technical specification is lacked, the safety of organic fertilizer using in farmland needs to be further improved.
In livestock and poultry cultivation source organic fertilizer material, heavy metal pollution problem has caused highest attention.According to statistics, China uses every year
Trace mineral supplement be about 15~180,000 tons, about 100,000 tons or so are not discharged by animal use with fowl and animal excrement.
According to the investigation to 8 provinces and cities' organic fertilizer of China North China in recent years such as Liu Rongle, content of beary metal in current portions organic waste with
Compared at the beginning of the last century 90's, part content of beary metal increases, in chicken manure and pig manure Zn, Cu, Cr, Cd, As, Hg increase compared with
More, Zn, Cu, As, Hg content increase in cow dung, and sheep manure then changes less.Zn, Cu, Cr increase 2~4 in livestock excrement composting
Times.According to our latest surveys, content of beary metal problem is very prominent in the pig manure of indivedual Animal Raising Zones, and Zn content is up to
2300mg/kg, lead content are up to 400mg/kg.Many experts think that China's heavy metal pollution is just dirty from air, water body to soil
Dye transfer, heavy metal pollution of soil has been enter into one " concentrating the multiple phase ", gradually to resident's health and agricultural product security structure
Into serious threat.
The main path of feces of livestock and poultry heavy metal pollution is administered, first, by changing heavy metal existing forms in feces of livestock and poultry
It is fixed, reduces its mobility and utilizability；Second is that removing heavy metals are removed from excrement.Both at home and abroad in control feces of livestock and poultry
The main method of heavy metal pollution is using livestock excrement composting, i.e., by compost material manual control in certain moisture, C/N ratios
It is acted on under ventilation condition by microbial fermentation, organic matter is converted into the process of fertilizer.At through Composting
The sludge of reason, because of the diluting effect of conditioner, heavy metal about reduces 7.3%-16%, and the form of heavy metal is made to have larger change
Change.At present, heavy metal deactivator is added in Composting Process, makes its heavy metal relatively low from the higher form of activity to activity
Forms Transformation is increasingly valued by people.
Livestock excrement composting heavy metal passivating technique has physical technique, chemical technology and microbial technique.It is more several
Operability, high efficiency, property of low cost and the environmental safety of heavy metals removal method find physical method in removal sludge
Removal efficiency is not as good as chemistry and microbial process during middle heavy metal, but cost is relatively low, easy to operate；And use chemical method and
It is troublesome in poeration because costly although the removal rate of heavy metal is higher when microorganism leaching method reduces content of beary metal, and
Treated, and waste liquid easily causes secondary pollution to environment, still fails to reach the practical stage at present.
Adsorption treatment is carried out to heavy metal in Composting Process using physical method, adsorbent derives from a wealth of sources, Method And Principle
It is fairly simple, easy to operate but not high to the removal efficiency of heavy metal, and adsorbent is difficult to detach with compost, remains on
In composting production.So the screening and isolation technics to high-efficiency adsorbent still need to further study and it is perfect.In view of above-mentioned original
Cause, science that organic fertilizer uses, safety research are very necessary and can urgent and relationship realize that agricultural is benign
The key link and technological difficulties of cycle.The danger of heavy-metal residual can be reduced to the passivating technique research of heavy metal in organic fertilizer
Evil risk, blocks transfer of the heavy metal to food chain, to ensureing that agricultural product quality and safety even people's health has safely very
Important realistic meaning.
Invention content
It is simple and practicable the purpose of the present invention is to provide a kind of method for reducing heavy metal validity in compost, utilize spy
Fixed heavy metal deactivator carries out compost fermentation, can significantly reduce heavy metal validity in compost, and can shorten the compost time, carry
High dehydration rate reduces nitrogen loss.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of method of heavy metal validity in reduction compost, using chicken manure as composting material, into raw material add in sawdust or
It is 25-30 that rice bran, which adjusts raw material C/N ratios,：1, raw material pH6.5-7.5 is adjusted, moisture control is 50-60%, then into raw material
The heavy metal deactivator that addition accounts for raw material weight in wet base 1-5% is uniformly mixed, and is sent out using slot type aerobic composting fermentation mode compost
Ferment.The every turning in 2 days of compost fermentation 1 time.
The present invention carries out compost fermentation by using specific heavy metal deactivator, and can significantly reduce heavy metal in compost has
Effect property, can accelerate compost to start, can shorten 6 days or so compost time in addition, adding in the heavy metal deactivator, improve dehydration rate
10.3%, reduce nitrogen loss 24.2%.Main cause can improve the porosity of compost material for heavy metal deactivator, promote empty
Air-flow leads to that be more advantageous to moisture loss related, while easily faster improves heap temperature, shortening fermentation time.Heavy metal deactivator is in itself
Suction-operated can reduce the ammonia volatilization of megathermal period, therefore can reduce nitrogen loss in composting process to a certain extent.As
It is preferred that the heavy metal deactivator is mixed by the component of following weight percent meter：Brown alga charcoal 30-50%, it is concave-convex
Stick soil 40-60%, sepiolite surplus.The present invention is directed to the characteristics of chicken manure, the heavy metal being applicable in when developing for Chicken Manure Compost
Passivator, using brown alga charcoal, attapulgite as primary raw material, collaboration performance effect when coordinating sea bubble, in particular by specific
Brown alga charcoal, have good passivation effect to heavy metal element Cu, Zn, Pb and As in chicken manure.In addition, the group of the present invention
Point raw material is natural, environmental-friendly, itself is nontoxic, without separation after adding in compost, into soil after be good soil improvement
Agent can improve the fertilizer conservation effect of soil.
It is made preferably, the brown alga charcoal carbonizes after being mixed according to mass percent meter by following raw material components：
Sargassum fusifome 40-60%, Sargassum horneri 30-50%, sargassum thunbergii surplus.Inventor has found by long felt Journal of Sex Research, using Phaeophyta
Several specific seaweed proportionings after charcoal is made, it is found that it has effects that efficient heavy metal is passivated for Chicken Manure Compost,
And production cost is relatively low, it is environmental-friendly.Sargassum fusifome charcoal, cooperation Sargassum horneri charcoal, sargassum thunbergii charcoal synergistic effect, more preferably
More efficient performance heavy metal is passivated effect.Inventor speculates that charcoal made of these three raw materials can have a preferable huge sum of money
Belong to passivation effect may material composition, structure and property with itself particularity it is related, especially they have special knot
Structure air bag is related.
Preferably, the specific method of the charing is：After raw material components are mixed, in oxygen-free environment, 600-650 DEG C
Lower cracking 3-5 hours, natural cooling.
Preferably, the brown alga charcoal is uses after peracid modification, the method for the acid modification is：
Brown alga charcoal is placed in acid solution, stir process 30-60min, clean with distilled water flushing after taking-up, drying crushes.This
Invention is handled by carrying out above-mentioned acid to brown alga charcoal, can be significantly improved and is passivated effect to the heavy metal in Chicken Manure Compost.
Preferably, the rotating speed of the stir process turns/min for 500-800.
Preferably, the acid solution be nitric acid and the mass concentration 20-30% of mass concentration 10-15% phosphoric acid according to
1:The volume ratio of 1-3 mixes.
Preferably, the attapulgite uses after modification, the method for the modification is：It will be just concave-convex
Stick soil is added in silane coupling agent-ethanol solution that mass concentration is 3-6%, is led under condition of nitrogen gas, is added at 50-60 DEG C
2-4 hours hot, absolute methanol is dried in vacuo 3-5h at washing 3-5 times, 60-70 DEG C.The present invention is by carrying out attapulgite
Modification is stated, can significantly improve and effect is passivated to the heavy metal in Chicken Manure Compost.
Preferably, the silane coupling agent is one kind in KH550, KH560, KH792.
Preferably, also added organic matter decomposing inoculant in raw material, the dosage of organic matter decomposing inoculant is raw material weight in wet base
0.1-0.3% by adding organic matter decomposing inoculant, fermentation time can be shortened.Generally do not add organic matter decomposing inoculant
Fermentation time added the fermentation time after organic matter decomposing inoculant at 30 days or so at 40-50 days.
The beneficial effects of the invention are as follows：It is simple and practicable, compost fermentation is carried out using specific heavy metal deactivator of the invention,
Heavy metal validity in compost can be significantly reduced, and the compost time can be shortened, improves dehydration rate, reduces nitrogen loss.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
In the present invention, if not refering in particular to, used raw material and equipment etc. are commercially available or commonly used in the art.
Method in following embodiments is the conventional method of this field unless otherwise instructed.
Attapulgite is commercially available, and granular size is in 80-120 mesh.Sepiolite is commercially available, and granular size is in 100-150 mesh.Sheep dwells
Dish, Sargassum horneri, sargassum thunbergii are commercially available dry product.
Embodiment 1：
Using chicken manure as composting material, sawdust tune is added in into raw material for a kind of method of heavy metal validity in reduction compost
It is 25 to save raw material C/N ratios：1, raw material pH 6.5 is adjusted, moisture control is 50%, then is added in into raw material and account for raw material weight in wet base
1% heavy metal deactivator is uniformly mixed, and using slot type aerobic composting fermentation mode compost fermentation, (existing conventional compostation is sent out
Ferment mode), fermentation time was at 34-44 days or so.
Heavy metal deactivator is mixed by the component of following weight percent meter：Brown alga charcoal 30%, attapulgite
60%, sepiolite 10%.
The brown alga charcoal is carbonized after being mixed according to mass percent meter by following raw material components and is made：Sargassum fusifome
40%, Sargassum horneri 50%, sargassum thunbergii 10%.The specific method of charing is：After raw material components are mixed, in oxygen-free environment, 600 DEG C
Lower cracking 5 hours, natural cooling.
Embodiment 2：
Using chicken manure as composting material, rice bran tune is added in into raw material for a kind of method of heavy metal validity in reduction compost
It is 30 to save raw material C/N ratios：1, raw material pH 7.5 is adjusted, moisture control is 60%, then is added in into raw material and account for raw material weight in wet base
5% heavy metal deactivator and the organic matter decomposing inoculant (commercially available) for accounting for raw material weight in wet base 0.1%, are uniformly mixed, and use
Slot type aerobic composting fermentation mode compost fermentation, fermentation time was at 24-30 days or so.
Heavy metal deactivator is mixed by the component of following weight percent meter：Brown alga charcoal 50%, attapulgite
40%, sepiolite 10%.
The brown alga charcoal is carbonized after being mixed according to mass percent meter by following raw material components and is made：Sargassum fusifome
60%, Sargassum horneri 30%, sargassum thunbergii 10%.The specific method of charing is：After raw material components are mixed, in oxygen-free environment, 650 DEG C
Lower cracking 3 hours, natural cooling.
Embodiment 3：
Using chicken manure as composting material, sawdust tune is added in into raw material for a kind of method of heavy metal validity in reduction compost
It is 28 to save raw material C/N ratios：1, raw material pH 7.0 is adjusted, moisture control is 55%, then is added in into raw material and account for raw material weight in wet base
3% heavy metal deactivator and the organic matter decomposing inoculant (commercially available) for accounting for raw material weight in wet base 0.3%, are uniformly mixed, and use
Slot type aerobic composting fermentation mode compost fermentation, fermentation time was at 24-30 days or so.
Heavy metal deactivator is mixed by the component of following weight percent meter：Brown alga charcoal 40%, attapulgite
50%, sepiolite 10%.
The brown alga charcoal is carbonized after being mixed according to mass percent meter by following raw material components and is made：Sargassum fusifome
50%, Sargassum horneri 40%, sargassum thunbergii 10%.The specific method of charing is：After raw material components are mixed, in oxygen-free environment, 650 DEG C
Lower cracking 4 hours, natural cooling.
Embodiment 4：
The present embodiment difference from Example 3 is：Brown alga charcoal is uses after peracid modification, the acid
The method of modification is：Brown alga charcoal is placed in acid solution, 500 turns/min stir process 60min, with distillation after taking-up
Water is rinsed well, is dried, and is crushed.The acid solution is the nitric acid of mass concentration 10% and the phosphoric acid of mass concentration 30% according to 1:
1 volume ratio mixes.
The other the same as in Example 3.
Embodiment 5：
The present embodiment difference from Example 3 is：Brown alga charcoal is uses after peracid modification, the acid
The method of modification is：Brown alga charcoal is placed in acid solution, 800 turns/min stir process 30min, with distillation after taking-up
Water is rinsed well, is dried, and is crushed.The acid solution is the nitric acid of mass concentration 15% and the phosphoric acid of mass concentration 20% according to 1:
3 volume ratio mixes.
The other the same as in Example 3.
Embodiment 6：
The present embodiment difference from Example 3 is：The attapulgite uses after modification, the modification
The method of processing is：First attapulgite is added in silane coupling agent-ethanol solution that mass concentration is 3%, leads to nitrogen
It under the conditions of gas, is heated 4 hours at 50 DEG C, absolute methanol is dried in vacuo 5h at washing 3 times, 60 DEG C.The silane coupling agent is
KH550。
The other the same as in Example 3.
Embodiment 7：
The present embodiment difference from Example 3 is：The attapulgite uses after modification, the modification
The method of processing is：First attapulgite is added in silane coupling agent-ethanol solution that mass concentration is 6%, leads to nitrogen
It under the conditions of gas, is heated 2 hours at 60 DEG C, absolute methanol is dried in vacuo 3h at washing 5 times, 70 DEG C.The silane coupling agent is
KH792。
The other the same as in Example 3.
Embodiment 8：
The present embodiment difference from Example 3 is：
To be used after peracid modification, the method for the acid modification is the brown alga charcoal：Brown alga is given birth to
Object charcoal is placed in acid solution, and 600 turns/min stir process 40min, clean with distilled water flushing after taking-up, drying crushes.It is described
Acid solution is the nitric acid of mass concentration 10% and the phosphoric acid of mass concentration 25% according to 1:2 volume ratio mixes.
The attapulgite uses after modification, and the method for the modification is：First attapulgite is added in
In the silane coupling agent-ethanol solution for being 5% to mass concentration, lead under condition of nitrogen gas, heated 3 hours at 55 DEG C, it is anhydrous
Methanol is dried in vacuo 4h at washing 4 times, 65 DEG C.The silane coupling agent is KH550.
The other the same as in Example 3.
Performance test：
1st, materials and methods：
Composting material：Chicken manure comes from Ningbo Zhong Ci organic fertilizers Co., Ltd.
Heavy metal additive：Arsanilic acid (to phenalgin arsenic acid, total arsenic content 34%)), copper sulphate, lead acetate is purchased from
Reagent Company.
Selecting chicken manure, its content of beary metal is shown in Table 1 for compost raw material, is previously added a certain amount of heavy metal additive：Cu
(practical dried poultrymanure per ton adds in 394g CuSO to about 100ppm (butt), Pb 75ppm, As 30ppm4.5H2O, 137.4g
Lead acetate, 88g arsanilic acids (to phenalgin arsenic acid, total arsenic content 34%)), abundant mixing.Then the blunt of different disposal is added
Agent (ratio of passivator is counted on the basis of chicken manure weight in wet base weight in wet base) carries out the technique compost fermentation of the present invention.28 days left sides of composting
Right to terminate fermentation, sieving crushes, and becomes organic fertilizer.
Content of beary metal in 1 compost raw material of table
5 processing of experiment setting：CK is compareed (being not added with heavy metal deactivator)；T1,7.5% concave convex rod of addition chicken manure weight in wet base
Native (PAL)；T2,7.5% sepiolite of addition chicken manure weight in wet base；T3,1% brown alga charcoal of addition chicken manure weight in wet base；T4, addition chicken manure are wet
Weigh the heavy metal deactivator of 5% present invention.Test site is Ningbo Cixi City Zhong Ci organic fertilizers Co., Ltd.T1, T2, T3 and T4
Each about 1000 kilograms of fresh chicken manures of processing (estimation finished product organic fertilizer is 0.5 ton).The additive amount of each group substance is with chicken manure
It is calculated on the basis of weight in wet base.
Sampling：Ferment 0d (before being not added with passivator) and when 28d acquire respectively compost sample measure As, Pb, Cu,
The bio-available Zn concentration and full dose of Zn.
The measure of organic fertilizer nutrient and heavy metal full dose is adopted with reference to organic fertilizer professional standard NY525-2012, bio-available Zn concentration
(NY/T 890-2004) is measured with after DTPA extraction methods.
According to measurement result, the apportionment ratio of available heavy metal is calculated as follows：Apportionment ratio=(available heavy metal
Content/heavy metal full dose) × 100%, the heavy metal passivation effect of compost=(before heap after available heavy metal content-heap effectively
State content of beary metal) available heavy metal content × 100% before/heap.Bioavailability of heavy metals after each passivator processing compost
Reducing effect computational methods：Passivation effect (%)=(control content-processing content)/control content × 100%.Data side
Difference analysis is analyzed with the result of multiple comparisons using SPSS13.0 statistical softwares.
2nd, result
Various passivator are in composting process to the passivation effect of heavy metal
Table 2 is the heavy metal full dose of compost, and in composting fermentation process, different content of beary metal have increase to be also reduced.
As can be seen from Table 3, composting process has preferable passivation effect to Pb and As.T1 processing only has Zn certain passivation effect
Fruit.T2 only has Cu certain passivation effect.T3 processing have good passivation effect to 4 Heavy Metallic Elements, to Cu, Zn,
The passivation effect of Pb and As is respectively up to 29.58%, 23.02%, 45.19% and 21.88%.T4 processing has Cu, Zn, Pb, As
There is best passivation effect, deactivation rate is respectively 30.07%, 36.19%, 48.30%, 32.25%.According to available state in compost
From the point of view of distribution of heavy metals rate variation (table 4), T3 and T4 processing can significantly reduce the apportionment ratio of available heavy metal in compost, and
T1, T2 only have the available state apportionment ratio of Zn or Cu certain reduction effect.
The result shows that T4 processing is best to the passivation effect of heavy metal in composting process.
The compost heavy metal full dose of the different passivator processing of table 2
The different passivator processing composting process available heavy metal contents of table 3 and passivation effect
The available heavy metal apportionment ratio variation (%) of 4 compost of table
Note:Apportionment ratio accounts for the percentage of its total amount for the content of available state, changes as apportionment ratio difference, "-" expression distribution
It is reduced after rate difference heap, "+" represents to increase.
The present invention adds in heavy metal deactivator in composting process compost to be accelerated to start, with being not added with heavy metal deactivator phase
Than that can shorten the compost time 6 days or so, improve dehydration rate 10.3%, reduce nitrogen loss 24.2%.
Embodiment described above is a kind of preferable scheme of the present invention, and not the present invention is made in any form
Limitation also has other variants and remodeling under the premise of without departing from the technical solution recorded in claim.
Claims (8)
- A kind of 1. method for reducing heavy metal validity in compost, it is characterised in that：Using chicken manure as composting material, add into raw material It is 25-30: 1 to enter sawdust or rice bran adjusting raw material C/N ratios, adjusts raw material pH6.5-7.5, and moisture control is 50-60%, then It is added in into raw material and accounts for the heavy metal deactivator of raw material weight in wet base 1-5% and be uniformly mixed, using slot type aerobic composting fermentation side Formula compost fermentation；The heavy metal deactivator is mixed by the component of following weight percent meter：Brown alga charcoal 30-50%, concave convex rod Native 40-60%, sepiolite surplus；The brown alga charcoal is carbonized after being mixed according to mass percent meter by following raw material components and is made Into：Sargassum fusifome 40-60%, Sargassum horneri 30-50%, sargassum thunbergii surplus.
- 2. according to the method described in claim 1, it is characterized in that：The specific method of the charing is：Raw material components are mixed Afterwards, it in oxygen-free environment, is cracked 3-5 hours at 600-650 DEG C, natural cooling.
- 3. method according to claim 1 or 2, it is characterised in that：The brown alga charcoal is after peracid modification It uses, the method for the acid modification is：Brown alga charcoal is placed in acid solution, stir process 30-60min, after taking-up It is clean with distilled water flushing, it dries, crushes.
- 4. according to the method described in claim 3, it is characterized in that：The rotating speed of the stir process turns/min for 500-800.
- 5. according to the method described in claim 3, it is characterized in that：The acid solution be mass concentration 10-15% nitric acid with The phosphoric acid of mass concentration 20-30% is mixed according to 1: 1-3 volume ratio.
- 6. method according to claim 1 or 2, it is characterised in that：The attapulgite uses after modification, institute The method for stating modification is：First attapulgite is added to silane coupling agent-ethanol solution that mass concentration is 3-6% In, lead under condition of nitrogen gas, heated 2-4 hours at 50-60 DEG C, absolute methanol is dried in vacuo 3-5h at washing 3-5 times, 60-70 DEG C.
- 7. according to the method described in claim 6, it is characterized in that：The silane coupling agent is in KH550, KH560, KH792 One kind.
- 8. method according to claim 1 or 2, it is characterised in that：It also added organic matter decomposing inoculant in raw material, it is organic The dosage of material decomposing agent is the 0.1-0.3% of raw material weight in wet base.
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