CN103058749A - Method for preparing amino acid liquid fertilizer by hydrolyzing animal proteins with multiple acids and application of amino acid liquid fertilizer - Google Patents
Method for preparing amino acid liquid fertilizer by hydrolyzing animal proteins with multiple acids and application of amino acid liquid fertilizer Download PDFInfo
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Abstract
The invention discloses a method for preparing an amino acid liquid fertilizer by hydrolyzing animal proteins with multiple acids and application of the amino acid liquid fertilizer. The method comprises the following steps: by using waste animal proteins (hair, skin, horns and the like) as raw materials, sequentially adding hydrochloric acid, phosphoric acid and sulfuric acid solutions with proper mass percentage into the animal proteins according to proper mass ratio; and after hydrolyzing the animal proteins, adding cheap alkaline matters (ammonia water, lime and magnesium oxide) for neutralization, filtering the neutralized acidolysis solution, and concentrating to obtain the amino acid liquid fertilizer. The liquid fertilizer contains 17 amino acids, and has high contents of N, P, Ca and Mg. The fertilizer efficiency test indicates that when being applied onto foliage, the amino acid liquid fertilizer can obviously increase the yield of pakchoi and obviously enhance the quality of vegetables, thereby having good economic benefits. The invention has the advantages of simple preparation technique and low production cost, is easy to implement, and is a high-quality fertilizer for producing no-pollution agricultural products.
Description
Technical field
The invention belongs to the fertilizer industry field, be specifically related to a kind of method of polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer.
Background technology
Along with the develop rapidly of economy, living standards of the people day by day improve, grain, the food of the public to depending on for existence, and safety in production and quality are had higher requirement.Producing nuisanceless, green and Organic food is urgent problem in the agriculture production to meet the need of market, and the demand of the new-type fertilizer relevant with its production is also increased thereupon.At present, directed synthetic and be widely used in medical circle and nutrition educational circles with the various functional polypeptides that protein is directly produced through enzymic hydrolysis with amino acid both at home and abroad.And this amino acid kind of producing is single component, produces liquid fertilizer with it and has cost height, characteristics that price is high, because the unicity of its kind, thorough not to some nutritive element chelating, fertilizer efficiency is not ideal enough.Simultaneously, the method exists the drawbacks such as occupied ground is large, fermentation period is grown (30-180d), easy destruction of organic material, deodorizing is not thorough, complex process, investment is large, environment is poor, such as Chinese patent CN1137030A and CN1077942A.Therefore, utilize the producer of the method production amino-acid liquid fertilizer less.On the market also the chelating agents such as useful EDTA, EDDHA come the chelating nutritive element to prepare fertilizer, but also have a problem, be exactly sequestrant this as chemical preparations, can not be utilized by plant absorbing, reduced the biological fertilizer efficiency of unit mass fertilizer.
Another method of Preparation of amino acid is to carry out the acid hydrolysis animal proteinum.Animal ceratin is a kind of biopolymer, mainly with the hair of animal, send out, the forms such as skin, angle exist, its principal character is that disulfide bond content is very high, protein content and the indispensable amino acid kind is many, content is high, molecular structure is tight, is difficult for degraded in physical environment.The annual discarded Keratin sulfate of China has the hundreds of thousands of ton.A large amount of keratic discarded wastes that not only cause resource also cause environmental pollution.Studies show that, contain 3 ~ 4% sulphur in the Keratin sulfate, 5 ~ 7% nitrogen can be used for producing the liquid amino-acid compound fertilizer, and the hydrolyzed solution residue becomes more cheap fertilizer as the substitute of animality ight soil simultaneously.But, just utilize one or both acid that animal proteinum is hydrolyzed in the prior art, the amino acid composition content of gained fertilizer is low.As using the hydrochloric acid hydrolysis animal proteinum in Chinese patent application number 201110161886.4 " nutrient for plants ", 201010183263.2 " a kind of amino acid biological fish fertilizer and preparation method ", 200410023063.5 " self-contained fertilizer of amino acid liquors " and the disclosed technique of 94117725.4 " a kind of liquid plant-foliage fertilizers and preparation method thereof "; Chinese patent 95102783.2 " amino-acid complex fertilizer and manufacture method thereof " uses the sulphuric acid hydrolysis animal proteinum; China Patent No. 201010553873.7 " a kind of preparation method of paper mulberry tree foliage fertilizer " is used sulfuric acid or hydrochloric acid hydrolysis animal ceratin.
Summary of the invention
The present invention combines the advantage of above-mentioned technique and has overcome its shortcoming, provides a kind of extraction process simple and easy to do, saves the energy and raw material, and cost is low, and environmental pollution is few, the preparation method of the amino-acid liquid fertilizer that amino acid composition content is high.The method is take discarded animal proteinum (hair, send out, skin or angle etc.) as raw material, hydrochloric acid, phosphoric acid and sulphuric acid soln with the appropriate mass percentage concentration add in the animal proteinum than successively by approrpiate wts, after the animal proteinum hydrolysis, add cheap alkaline matter (ammoniacal liquor, lime and magnesium oxide) and neutralize, thereby obtain amino-acid liquid fertilizer.
To achieve these goals, the present invention adopts following technical scheme:
The method of polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer is characterized in that may further comprise the steps:
(1) animal proteinum pre-treatment: animal proteinum is made animal albumen powder after cleaning, drying, pulverizing;
(2) acidolysis: hydrochloric acid, sulfuric acid and phosphoric acid added in the reactor with animal albumen powder in the step (1) according to the weight ratio of 3.5 ~ 8:3.5 ~ 1:3.5 ~ 1 mix, the mass ratio of the total mass of animal albumen powder and sulfuric acid, hydrochloric acid and phosphoric acid is 1:1.6 ~ 2, reaction conditions be under normal pressure in 100 ~ 120 ℃ of acidolysis 6 ~ 8h, obtain acid hydrolysis solution;
The mass percent concentration of described sulfuric acid, hydrochloric acid and phosphoric acid is respectively 20 ~ 40%, 15 ~ 25% and 30 ~ 45%;
The addition sequence of described sulfuric acid, hydrochloric acid and phosphoric acid is followed successively by hydrochloric acid, phosphoric acid and sulfuric acid;
(3) alkali neutralization: the acid hydrolysis solution in the step (2) is cooled to 70 ~ 85 ℃, adds successively 15 ~ 25% ammoniacal liquor, lime and magnesium oxide in the reactor to neutralize, transferring to pH is 3.0 ~ 6.0, at 70 ~ 90 ℃ of chelating 2 ~ 4h, and the acid hydrolysis solution after obtaining neutralizing;
(4) with the acid hydrolysis solution after the neutralization described in the step (3) after filtration, concentrated can obtain amino-acid liquid fertilizer.
In preferred version, animal proteinum described in the step (1) be animal hair, send out, skin or angle;
In preferred version, the mass ratio of hydrochloric acid, sulfuric acid and phosphoric acid is 8: 1: 1 described in the step (2);
In preferred version, the mass ratio of the total mass of animal albumen powder and sulfuric acid, hydrochloric acid and phosphoric acid is 1:2 described in the step (2);
In preferred version, the mass percent concentration of sulfuric acid, hydrochloric acid, phosphoric acid is respectively 20%, 25%, 30% described in the step (2);
In preferred version, the add-on of ammoniacal liquor described in the step (3) is according to the ammoniacal liquor quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=10 ~ 25:100;
In preferred version, the add-on of lime described in the step (3) is according to lime quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=1 ~ 4:100;
In preferred version, magnesian add-on described in the step (3) is according to the magnesium oxide quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=2 ~ 6:100.
The invention has the beneficial effects as follows:
1. to select discarded animal proteinum be raw material in the present invention, not only can reduce the discharging of the waste of contaminate environment, and can reduce the production cost of amino-acid liquid fertilizer.
2. the present invention is with in polyacid (hydrochloric acid, phosphoric acid and the sulfuric acid) hydrolyzed animal protein, improved on the one hand the hydrolysis efficiency of animal proteinum, contained N(amino acid, ammoniacal liquor in the acid hydrolysis solution after the hydrolysis on the other hand), the P(phosphoric acid hydrolysis), disulfide linkage hydrolysis in the S(protein) etc. nutritive ingredient.
3. the hydrochloric acid of the present invention by exploration discovery 25%, 20% sulfuric acid and 30% phosphoric acid are the optimum concns of hydrolyzed animal protein.25% hydrochloric acid, 20% sulfuric acid and 30% phosphoric acid can guarantee the boiling point of mixing solutions between 100 ~ 120 ℃ after joining animal proteinum respectively according to the mass ratio of 8:1:1, are conducive to animal proteinum and are hydrolyzed fully thoroughly, and aminoacids content is higher.
4. the addition sequence of polyacid is followed successively by hydrochloric acid, phosphoric acid and sulfuric acid in the discovery polyacid hydrolyzed animal protein of the invention, such addition sequence is except experiment safety is considered, also have two reasons: (1) hydrochloric acid is volatile acid, if directly add sulfuric acid, because the heat release of sulfuric acid can cause the volatilization in the hydrochloric acid adition process, is unfavorable for the hydrolysis of animal proteinum, also may work the mischief, so add first hydrochloric acid.Shock absorption can be played with phosphoric acid in the centre, adds sulfuric acid again, has namely alleviated the volatilization of hydrochloric acid, and phosphoric acid and amino acid have good mating reaction simultaneously, can reduce amino acid whose further hydrolysis, reduce nitrogen loss.(2) sulfuric acid has strong hydrolysis exothermic effects, and sulfuric acid adds at last, is conducive to improve temperature of reaction, increases heat of reaction, can reduce like this energy consumption in next step heat-processed, makes the more environmental protection and energy saving of whole production technique.
5. the present invention is after animal proteinum hydrolysis, and adding ammoniacal liquor, lime and magnesium oxide in the acid hydrolysis solution carries out neutralization reaction.On the one hand, ammoniacal liquor, lime and magnesium oxide are cheap alkaline matters, have reduced production cost; On the other hand, the ammonium nitrogen after the hydrolysis (amino acid hydrolysis, ammoniacal liquor), phosphate radical (phosphoric acid hydrolysis), calcium and magnesium are the essential nutrients of plant-growth, and these nutrients processes and various chelating amino acids are conducive to the absorption of plant.
Description of drawings
Fig. 1 is amino-acid liquid fertiliser production synoptic diagram
Fig. 2 is 12 prescription amino-acid liquid fertilizer product figure
Fig. 3 is the standard amino acid collection of illustrative plates
Fig. 4 is sulphuric acid hydrolysis prescription amino acid collection of illustrative plates
Fig. 5 is sulfuric acid+phosphoric acid hydrolysis prescription amino acid collection of illustrative plates
Fig. 6 is sulfuric acid+phosphoric acid+hydrochloric acid hydrolysis prescription amino acid collection of illustrative plates
Fig. 7 is that different ingredients amino-acid liquid fertilizer is processed the blue or green Plantula Brassicae chinensis pictorial diagram in Shanghai
Embodiment
Below in conjunction with accompanying drawing and embodiment and Comparative Examples the present invention is described in further detail, employed test method is ordinary method if no special instructions among the following embodiment; Employed material, reagent etc. if no special instructions, are reagent and the material that can obtain from commercial channels.
Embodiment 1
The concrete steps of present embodiment are seen Fig. 1.
(1) pre-treatment of animal proteinum: after having cleared up plastics, wooden unit and the metal impurities in the discarded pig hair, under the sun, be exposed to the sun 2 days, then use the drying drum blower fan in 60 ℃ of dryings 6 hours, dry good pig hair is prepared into pig hair meal through the hair pulverizer, namely can be used as the raw materials of amino-acid liquid fertilizer
(2) acidolysis: to be 25% hydrochloric acid, 30% phosphoric acid and 20% sulfuric acid according to mass ratio add in the reactor successively with pig hair meal in the step (1) mixes with mass percent concentration by the content of each component of appointment in the following table 1, and the mass ratio of the total mass of pig hair meal and hydrochloric acid, phosphoric acid and sulfuric acid is 1:2; Be heated to 80 ℃, temperature controls to 110 ℃ behind the 2h, and the acidolysis time is 7h, obtains acid hydrolysis solution
(3) neutralization: after acidolysis is complete, adds successively 25% ammoniacal liquor, lime, magnesium oxide in the reactor and neutralize, the add-on of ammoniacal liquor is according to the ammoniacal liquor quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=10:100; The add-on of lime is according to lime quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=1:100; The magnesium oxide add-on is according to the magnesium oxide quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=2:100; The pH value is transferred to 4, and in 75 ℃ of chelatings, the chelating time is 3h;
(4) filter: behind the acidolysis solution left standstill 6h after the neutralization, after cooling, filter with belt filter press, the filter residue water cleans 1 time, the amino acid solution after namely obtaining filtering.
(5) concentrated: with high-efficiency concentrator the amino acid solution after filtering is concentrated, temperature is controlled at 60 ℃, and concentrated 2 hours, concentrated ratio was 1:2.Namely obtain amino-acid liquid fertilizer shown in VII among Fig. 2.
Embodiment 2
Press the method for each component concentration repetition embodiment 1 of appointment in the following table 1, the amino-acid liquid fertilizer that obtains is shown in VIII among Fig. 2.
Embodiment 3
Press the method for each component concentration repetition embodiment 1 of appointment in the following table 1, the amino-acid liquid fertilizer that obtains is shown in IX among Fig. 2.
Embodiment 4
Press the method for each component concentration repetition embodiment 1 of appointment in the following table 1, the amino-acid liquid fertilizer that obtains is shown in X among Fig. 2.
Press the method for each component concentration repetition embodiment 1 of appointment in the following table 1, the amino-acid liquid fertilizer that obtains is shown in XI among Fig. 2.
Embodiment 6
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but replace the pig hair as material with hair, the amino-acid liquid fertilizer that obtains is shown in XII among Fig. 2.
Comparative Examples 1
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but only be hydrolyzed the pig hair with a kind of acid (hydrochloric acid), neutralize with two kinds of neutralizing agents (ammoniacal liquor and lime), the amino-acid liquid fertilizer that obtains is shown in I among Fig. 2.
Comparative Examples 2
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but only be hydrolyzed the pig hair with a kind of acid (sulfuric acid), neutralize with two kinds of neutralizing agents (ammoniacal liquor and lime), the amino-acid liquid fertilizer that obtains is shown in II among Fig. 2.
Comparative Examples 3
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but only be hydrolyzed the pig hair with a kind of acid (phosphoric acid), neutralize with two kinds of neutralizing agents (ammoniacal liquor and lime), the amino-acid liquid fertilizer that obtains is shown in III among Fig. 2.
Comparative Examples 4
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but only be hydrolyzed the pig hair with two kinds of acid (sulfuric acid+hydrochloric acid), neutralize with two kinds of neutralizing agents (ammoniacal liquor and lime), the amino-acid liquid fertilizer that obtains is shown in IV among Fig. 2.
Comparative Examples 5
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but only be hydrolyzed the pig hair with two kinds of acid (hydrochloric acid+phosphoric acid), neutralize with two kinds of neutralizing agents (ammoniacal liquor and lime), the amino-acid liquid fertilizer that obtains is shown in V among Fig. 2.
Comparative Examples 6
Repeat the method for embodiment 1 by each component concentration of appointment in the following table 1, but only be hydrolyzed the pig hair with two kinds of acid (sulfuric acid+phosphoric acid), neutralize with two kinds of neutralizing agents (ammoniacal liquor and lime), the amino-acid liquid fertilizer that obtains is shown in VI among Fig. 2.
Table 1 amino-acid liquid fertilizer formula embodiment (unit: kilogram)
Used pig hair source family or the large-scale slaughterhouse of raising pigs provide among the embodiment discarded pig hair and appurtenant thereof, hair derives from the discarded hair that barber shop or each hairdressing place provide, pig hair or hair can be for the preparation of amino acid starting materials after the drying of being exposed to the sun under the sun after cleaning.
Described input amount is animal proteinum and three kinds of acid solutions, and three kinds of acid solutions are respectively 20% sulfuric acid, 25% hydrochloric acid and 30% phosphoric acid.20% sulfuric acid is that industrial sulphuric acid obtains 20% sulfuric acid by the suitable proportion dilution; 25% hydrochloric acid is 25% hydrochloric acid that technical hydrochloric acid obtains by suitable dilution proportion; 30% phosphoric acid is that industrial phosphoric acid obtains 30% phosphoric acid by the suitable proportion dilution.
Described neutralizing agent is three kinds of alkaline matters, is respectively ammoniacal liquor, lime and magnesium oxide.Ammoniacal liquor, lime and magnesium oxide all are industrial rank.
Measure the nutrient composition (N: full-automatic azotometer, 2300, Sweden of the prepared amino-acid liquid fertilizer of Comparative Examples 1 ~ 6 and embodiment 1 ~ 6; P
2O
5: the yellow colorimetry of vanadium molybdenum, UV-1700, China; Ca, Mg: atomic absorption spectrophotometer, Z-5700, Japan; Total amino acid content: ninhydrin colorimetry, UV-1700, China), heavy metal content (Cd, Pb: atomic absorption spectrophotometer, Z-5700, Japan), amino acid kind, quantity (automatic analyzer for amino acids, L-8800, Japan; Fig. 3 is the standard amino acid collection of illustrative plates; Fig. 4 is sulphuric acid hydrolysis prescription amino acid collection of illustrative plates; Fig. 5 is sulfuric acid+phosphoric acid hydrolysis prescription amino acid collection of illustrative plates; Fig. 6 is sulfuric acid+phosphoric acid+hydrochloric acid hydrolysis prescription amino acid collection of illustrative plates) and cost budgeting, the result sees Table respectively 2,3,4.
Nutrient composition and the heavy metal content of table 2 formulation Example amino-acid liquid fertilizer
As can be seen from Table 2, N rich content in the 12 seed amino acids prescription liquid fertilizer, average range is 13 ~ 29%; The total amino acid content average range is about 20%; P in the amino acid prescription liquid fertilizer of phosphoric acid hydrolysis is arranged
2O
5The content average range is 2 ~ 7%; Ca, Mg content are all about 1% in the amino acid prescription liquid fertilizer of processing with lime and magnesium oxide; Cd in country's specified value (GB/T 17419.1998)≤0.002%, Pb≤0.01%, as seen from the table, all prescription liquid fertilizer heavy metal cadmiums and lead are all well below national specified value.
Amino acid kind in the table 3 different ingredients amino-acid liquid fertilizer and content (%)
As can be seen from Table 3,12 kinds the prescription liquid fertilizer in amino acid A wide selection of colours and designs (17 kinds).Fig. 3, Fig. 4, Fig. 5 and Fig. 6 represent respectively standard amino acid collection of illustrative plates, a kind of acid (sulfuric acid) hydrolysis prescription amino acid collection of illustrative plates, two kinds of acid (sulfuric acid+phosphoric acid) hydrolysis prescription amino acid collection of illustrative plates, three kinds of acid (sulfuric acid+phosphoric acid+hydrochloric acid) hydrolysis prescription amino acid collection of illustrative plates.As can be known, various types of aminoacids content is all more than 0.1% from table 3 and Fig. 3,4,5,6.Different hydrolyzed solutions is processed different, and 17 seed amino acid quantity there are differences in the amino-acid liquid fertilizer.Wherein, aspartic acid Asp, Serine Ser, L-glutamic acid Glu, glycine Gly, L-Ala Ala, arginine Arg equal size are higher, greatly about 1 ~ 3%.
The cost budgeting (by 1 ton) of table 4 different ingredients amino-acid liquid fertilizer
Annotate: hydrochloric acid: annotate: hydrochloric acid: 100 yuan/tons; Sulfuric acid: 400 yuan/tons; Phosphoric acid: 4300 yuan/tons; Ammoniacal liquor: 750 yuan/tons; Calcium oxide: 600 yuan/tons; 500 yuan/tons in magnesium oxide.
Table 4 is 12 seed amino acid Recipe cost budgetings, raw material, hydrolyzed solution, neutralizing agent and charges for water and electricity etc. are calculated by the market raw materials cost, except formula I II reaches 4360 yuan because phosphoric acid cost height causes total cost, other each amino acid prescription cost is probably about 1000 ~ 3000 yuan, and according to 30% amino-acid liquid fertilizer city price on the market 5000 ~ 10000 yuan of scopes, therefore, the amino acid cost of this explained hereafter is well below the price of ammino acid liquid fertilizer on the market, and, the amino-acid liquid fertilizer nutrient content of this explained hereafter is far above like product on the market, and the amino-acid liquid fertilizer of this technique preparation can extensively be promoted.
Application Example 1.
Pot experiment: the amino-acid liquid fertilizer of the present invention's preparation is used for spraying the blue or green Plantula Brassicae chinensis in Shanghai, tests as follows: this is tested in July, 2012 to September and carries out in money ring institute solarium, Wushan South China Agricultural University ,Guangzhou City ,Guangdong Province.Utilization take pig hair or hair as solid-state animal proteinum raw material invention 12 prescription amino-acid liquid fertilizer and on the market 30% amino-acid liquid fertilizer the blue or green Plantula Brassicae chinensis in Shanghai is carried out potted plant manure trial, every basin is planted 3 strains, every group is repeated (see figure 7)s 3 times.Measured the blue or green Quality of Chinese Cabbage (soluble proteins: Xylene Brilliant Cyanine G colorimetry in Shanghai in rear 30 days in plantation; Vc:2,6-dichloroindophenol volumetry; Soluble sugar: anthrone colorimetry; NO
3 -: the Whitfield's ointment nitrofication process), physical signs (POD: guaiacol colorimetric method; The thiobarbituricacidα-colorimetry) and output etc. MDA:, the results are shown in Table 5 and table 6:
Table 5 different ingredients amino-acid liquid fertilizer is on the impact of the blue or green Quality of Chinese Cabbage in Shanghai and physical signs
As can be seen from Table 5, compared with the control, the blue or green Plantula Brassicae chinensis soluble proteins in the Shanghai that 12 seed amino acids prescriptions liquid fertilizer is processed, Vc content, soluble sugar and POD content have increased respectively 8 ~ 42%, 16 ~ 52%, 34 ~ 415% and 20 ~ 77%, NO
3 -Descended respectively 16 ~ 57% and 2 ~ 19% with MDA content, shown, used the enhancing that amino-acid liquid fertilizer is conducive to the blue or green quality in Shanghai and anti-ageing ability.
Table 6 different ingredients amino-acid liquid fertilizer is on the output of the blue or green Plantula Brassicae chinensis in Shanghai and the impact of economic benefit
Annotate: economic benefit is calculated by the blue or green Plantula Brassicae chinensis in every mu of 40000 strain Shanghai.5 yuan of/kilogram calculating of local market valency.
As can be seen from Table 6, compared with the control, the blue or green Plantula Brassicae chinensis number of blade in Shanghai, chlorophyll content, biomass, output and productivity ratio that 12 seed amino acids prescription liquid fertilizer is processed have increased respectively 0 ~ 27%, 3 ~ 13%, 38 ~ 92%, 46 ~ 160% and 18 ~ 43%, and economic benefit has increased by 46 ~ 160%.
Claims (8)
1. the method for a polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer is characterized in that may further comprise the steps:
(1) animal proteinum pre-treatment: animal proteinum is made animal albumen powder after cleaning, drying, pulverizing;
(2) acidolysis: hydrochloric acid, sulfuric acid and phosphoric acid added in the reactor with animal albumen powder in the step (1) according to the mass ratio of 3.5 ~ 8:3.5 ~ 1:3.5 ~ 1 mix, the mass ratio of the total mass of animal albumen powder and sulfuric acid, hydrochloric acid and phosphoric acid is 1:1.6 ~ 2, reaction conditions be under normal pressure in 100 ~ 120 ℃ of acidolysis 6 ~ 8h, obtain acid hydrolysis solution;
The mass percent concentration of described sulfuric acid, hydrochloric acid and phosphoric acid is respectively 20 ~ 40%, 15 ~ 25% and 30 ~ 45%;
The addition sequence of described sulfuric acid, hydrochloric acid and phosphoric acid is followed successively by hydrochloric acid, phosphoric acid and sulfuric acid;
(3) alkali neutralization: the acid hydrolysis solution in the step (2) is cooled to 70 ~ 85 ℃, adds successively 15 ~ 25% ammoniacal liquor, lime and magnesium oxide in the reactor to neutralize, transferring to pH is 3.0 ~ 6.0, at 70 ~ 90 ℃ of chelating 2 ~ 4h, and the acid hydrolysis solution after obtaining neutralizing;
(4) with the acid hydrolysis solution after the neutralization described in the step (3) after filtration, concentrated can obtain amino-acid liquid fertilizer.
2. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1, it is characterized in that animal proteinum described in the step (1) be animal hair, send out, skin or angle.
3. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1, the mass ratio that it is characterized in that hydrochloric acid, sulfuric acid and phosphoric acid described in the step (2) is 8: 1: 1.
4. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1 is characterized in that the mass ratio of the total mass of animal albumen powder described in the step (2) and sulfuric acid, hydrochloric acid and phosphoric acid is 1:2.
5. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1 is characterized in that the mass percent concentration of sulfuric acid, hydrochloric acid, phosphoric acid described in the step (2) is respectively 20%, 25% and 30%.
6. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1, the add-on that it is characterized in that ammoniacal liquor described in the step (3) are according to the ammoniacal liquor quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=10 ~ 25:100.
7. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1, the add-on that it is characterized in that lime described in the step (3) are according to lime quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=1 ~ 4:100.
8. the method for polyacid hydrolyzed animal protein Preparation of amino acid liquid fertilizer as claimed in claim 1 is characterized in that magnesian add-on described in the step (3) is according to the magnesium oxide quality: hydrochloric acid, phosphoric acid and sulfuric acid total mass=2 ~ 6:100.
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