CN109180224A - A method of faintly acid liquid fertilizer is produced using converter slag - Google Patents
A method of faintly acid liquid fertilizer is produced using converter slag Download PDFInfo
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- CN109180224A CN109180224A CN201811375255.0A CN201811375255A CN109180224A CN 109180224 A CN109180224 A CN 109180224A CN 201811375255 A CN201811375255 A CN 201811375255A CN 109180224 A CN109180224 A CN 109180224A
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- converter slag
- slag
- liquid fertilizer
- acid
- hno
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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
- C05G5/00—Fertilisers characterised by their form
- C05G5/20—Liquid fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
Abstract
The invention discloses a kind of methods using converter slag production faintly acid liquid fertilizer, belong to field of fertilizer production.Including carrying out modifying process to melting converter slag with biomass lime-ash, then converter slag pulverizing and jevigating will be modified, levigate converter slag addition malic acid-HNO3In mixed solution, stirring makes the dissolution of the elements such as calcium, silicon, phosphorus in converter slag, backward filtrate in ammonia spirit is added, adjust filtrate acid-base property and ingredient, liquid fertilizer of the acquisition simultaneously containing multielements such as nitrogen, potassium, magnesium, calcium, silicon, iron.The biomass lime-ash that metallurgical industry waste residue and power industry generation are taken full advantage of in production process of the present invention, has achieved the purpose that " treatment of wastes with processes of wastes against one another "；Leaching process is carried out to the valuable element in waste residue using organic acid and inorganic acid mixed solution, obtain the liquid fertilizer that can be used for agricultural production, not phosphorous tailings can return to smelting and recycle, and the efficient circulation for realizing Industrial Solid Waste utilizes and the high value added utilization of resource.
Description
Technical field
The invention belongs to liquid fertilizer production fields, and in particular to a kind of to produce faintly acid liquid fertilizer using converter slag
Method.
Background technique
It is well known that phosphorus is one of indispensable important element of crop growth, currently, 13.19 hundred million hectares of the whole world
Arable land in there are about 43% scarce phosphorus, there are about 2/3 serious scarce phosphorus in 1.7 hundred million hectares of China farmland.In addition, phosphorus is that one kind can not be again again
Raw mineral resources, according to current explored phosphorus ore reserves and exploitation rate, the existing phosphate rock resource in the world can only maintain 50~
400 years, phosphorus was still most important limiting factor in China or even world agriculture production, and the supply and demand of phosphate fertilizer are not only now even more
One of the conspicuous contradiction of agricultural production in future.
Studies have shown that root system of plant, which can secrete low molecular organic acids, reduces soil pH value, promote slightly solubility phosphoric acid in soil
The dissolution of salt can also occur complex reaction with metal ions such as Fe, Al and Ca, promote plant to slightly solubility phosphorus forms and inhale
It receives.In addition, the P elements in steel slag are not soluble in water, and it is soluble in the organic acid of plant root secretion, belongs to slow release phosphate fertilizer.For
Preferably using the phosphor resource in steel slag, people attempt for steel slag to be manured into soil in make phosphate fertilizer, make in steel slag to the maximum extent
Phosphorus be dissolved in organic acid secreted by plant root, but because steel slag in the lower (w (P of phosphorus content2O5) < 5%) and steel slag
Composition and performance differ greatly, the release rule of phosphorus is still not clear in different steel slags, causes the phosphorus utilization in steel slag too low.
The related scholar of agriculture field confirms that the fixation of soluble phosphoric manure in soil can be reduced by applying Exogenous Organic Acids, promote insoluble phosphorus
The dissolution of fertilizer, compared to organic acid is not applied, average plant height, root weight and the total biomass of plant be increased.Therefore, if
Using the phosphorus in organic acid " active " dissolution steel slag, phosphorous organic acid soln is obtained as liquid phosphate fertilizer be manured into soil, no
It only can solve soil and lack phosphorus problem, may additionally facilitate the dissolution of difficultly soluble phosphatic fertilizer in soil, improve the utilization rate of phosphorus in soil.
Steel slag is the solid waste that steelmaking process generates, and yield is about 10~20% or so of crude steel yield, 2017 years
The crude steel yield in China is about 800,000,000 tons, and the discharge amount of steel slag is close to 100,000,000 tons, since the P elements in steel slag limit it in steel
Effective use inside factory, comprehensive utilization ratio are only 25~30%, and most of steel slag is thrown aside or filled after selecting iron, sternly
Ghost image rings ecological environment.In recent years, with the development and utilization of high-phosphorus iron ore and the implementation of converter duplex dephosphorized technique, steel slag
In P2O5Content has been increased to 10% or more, on the one hand, converter slag reserves are big.The phosphorus content phase of another aspect converter slag
To higher, the especially steel slag that generates of converter duplex technique.In addition, also containing a large amount of nutrition members such as Ca, Mg, Fe, Si in steel slag
Element.Therefore, the valuable elements such as P, Ca, Mg, Fe, Si in converter duplex technique high phosphorus slag are extracted to follow agricultural production, resource
Ring utilizes and environmental protection all has significance.In steel slag in terms of the extraction of valuable element, China Patent No.
CN201510318286.2 discloses a kind of steel slag dephosphorization circulation utilization method, the invention by slag crushing and it is levigate after, use lemon
Acid-NaOH-HCl buffer leaching process, obtains phosphorous filtrate and low-phosphorous steel slag；Low-phosphorous steel slag is dried later
Afterwards, sintering, ironmaking or steel making working procedure are returned, is recycled.
Currently, the biomass energies such as plant, crops are increasingly valued by people, biomass power generation has become China
Indispensable important component in energy adjustment.Along with the fast development of biomass energy, also generated in production process
A large amount of biomass lime-ash, has the lime-ash of half or so to be dropped or fill, a part is used as farmland modifying agent, builds at present
Material, industrial chemicals are built, intrinsic value is not efficiently utilized.Biomass lime-ash belongs to renewable resource, usually contain potassium,
The mineral nutrient elements such as phosphorus, calcium, magnesium, silicon, wherein K in rice lime-ash2O content is higher and contains a certain amount of P2O5, table 1 is portion
Mitogenetic substance lime-ash at being grouped as, cheap potassium base modification agent processing steel slag can be used as in biomass lime-ash.Cause
This promotes the nutrients such as phosphorus and calcium, silicon, magnesium, potassium in mixing slag if modifying using the potassium base in lime-ash to converter slag
Dissolution in acid solution produces liquid fertilizer, can not only reduce the secondary pollution of converter slag and biomass lime-ash to environment,
The high value added utilization for realizing trade waste also can be relieved China's soil and lack phosphorus status and the dependence to rock phosphate in powder, reduces soil
The content of insoluble phosphorus in earth, improves the utilization efficiency of phosphorus.
1 biomass lime-ash of table at being grouped as
Summary of the invention
1. to solve the problems, such as
In order to solve the problem of that the content reduction of insoluble phosphorus in soil improves the utilization efficiency of phosphorus, the present invention provides one
Kind modifies converter slag by biomass lime-ash, promotes in steel slag using the method for converter slag production faintly acid liquid fertilizer
2CaO·SiO2-2CaO·K2O·P2O5And 2CaOSiO2-2CaO·P2O5The formation of solid solution, and increase its content, benefit
With malic acid-HNO3Phosphorus in mixed solution dissolution modification steel slag, filters to obtain phosphorous filtrate, by the way that ammonia is added into phosphorous filtrate
Aqueous solution adjusts filtrate acid-base property, obtains liquid fertilizer.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
A kind of method using converter slag production faintly acid liquid fertilizer of the invention, first in biomass lime-ash
Potassium base component steel slag that converter duplex technique is produced carry out modifying process, by that will modify steel slag grinding, and leach, stir etc.
Intensive treatment, it is final to realize that P elements are shifted from steel slag into organic acid, phosphorous filtrate and dephosphorization tailings are obtained after filtering, it is phosphorous
Ammonia spirit is added in filtrate, adjusts acid-base property and ingredient, obtains liquid fertilizer, and dephosphorization steel slag returns to refining after being dried
Steel.
Biomass lime-ash is added into steel slag and carries out modifying process to steel slag by the present invention, promotes 2CaOSiO2-2CaO·
K2O·P2O5The production quantity of the formation of solid solution and phosphorous solid solution increases, and specifically comprises the following steps:
(1) it is 2mm biomass lime-ash below that granularity is added into molten steel slag, and the grey quantity of slag is 20~40mass%；
(2) by steel slag at 1723~1823K insulation reaction 60min~90min；
(3) control cooling velocity is 3~5K/min, and steel slag is made to be slowly dropped to room temperature；
(4) cooling modification slag crushing grinding is sized to certain partial size, is used for wet-leaching.
Malic acid-HNO of the present invention3The key step that mixed solution dissolves out valuable element in steel slag is as follows
It (1) is 45~150 μm by the slag specimen partial size of cooling modification slag crushing grinding screening；
(2) malic acid-HNO that secure ph is 5~63Mixed solution is as leachate, malic acid and HNO3Mixed proportion
For 2:1, liquid feeding system is automatically controlled by SC-200A pH, solution acid-basicity is controlled；
(3) malic acid-HNO prepared with step (2)3Mixed solution carries out leaching process to the steel slag of step (1), wherein
Malic acid-HNO3The extraction temperature that mixed solution handles steel slag is 298~323K, and extraction time is 60~150min, malic acid-
HNO3Mixed solution and the steel slag liquid-solid ratio of the screening are 150~400:1 (mL:g), and electric mixer speed of agitator is
300r/min；
(4) mixed liquor after step (3) leaching process is separated by solid-liquid separation, obtains phosphorous filtrate and dephosphorization steel slag；
(5) the phosphorous filtrate of step (4) is continued cycling through for leaching next group modification converter slag, the phosphorous filter of faintly acid
After liquid recycles 10~20 times, ammonium hydroxide is added into filtrate and adjusts filtrate acid-base property, obtains faintly acid liquid fertilizer；
(6) the dephosphorization steel slag of step (4) metallurgical process is returned to recycle after being dried.
The present invention passes through malic acid-HNO3Mixed solution dissolves out the working principle of phosphorus preparation faintly acid liquid fertilizer in steel slag
Be: phosphorus is in steel slag usually with 2CaOSiO2-3CaO·P2O5The form of solid solution exists, but in the solid solution phosphorus dissolution
Rate is not high, and a large amount of potassium element of content in biomass lime-ash, after carrying out modifier treatment to steel slag using biomass lime-ash, phosphorus,
Potassium element is mainly with 2CaOSiO2-2CaO·K2O·P2O5The form of solid solution exists, this is primarily due to K-Radius with
Ca2+It is close, and with [PO4]3-Binding ability it is stronger, 2CaOSiO can be replaced2-3CaO·P2O5Ca in solid solution2+,
To generate 2CaOSiO2-2CaO·K2O·P2O5Solid solution.Since the solvability of sylvite in aqueous solution is higher, thus
2CaO·SiO2-2CaO·K2O·P2O5The formation of solid solution has conducive to the dissolution of the elements such as phosphorus, potassium.In addition, malic acid-HNO3
H in mixed solution+The phosphate anion in steel slag, the equation of the complex reaction are as follows: CaX can largely be dissolved2·3Ca
(PO4)2+ malic acid+nitric acid → water solubility PO4 2-Malic acid complex+nitrate of+Ca, malic acid and HNO3Ratio is 2:1,
It can promote the formation of the malic acid complex of Ca, while the nutrition such as calcium, silicon, magnesium, potassium in biomass lime-ash and converter slag
Element is also largely dissolved out, and the microelements such as iron, boron, titanium, zinc are partially dissolved out, later by ammonium hydroxide adjust filtrate acid-base property and
Ingredient can form the ingredients such as monoammonium phosphate, Diammonium phosphate (DAP), ammonium nitrate, potassium dihydrogen phosphate, potassium nitrate, calcium nitrate, phosphoric acid, meet
Nutritional ingredient contained by general liquid fertilizer.
As a further improvement of the present invention, preferably 45~48 μm of Sieving and casing of steel slag are modified, partial size appropriate is advantageous
In the dissolution efficiency of raising phosphorus, while reducing the dissolution and cost of iron.
As a further improvement of the present invention, the malic acid-HNO of preferable ph 5.5~63Mixed solution, with to greatest extent
Ground dissolves out phosphorus, while under the pH value, water-soluble PO4 2-, Ca malic acid complex stability it is good, be not susceptible to back reaction,
Guarantee the dissolution efficiency of higher phosphorous.
As a further improvement of the present invention, extraction temperature preferably 303~308K, extraction time is preferably 90~
120min, dissolution reaction temperature appropriate and time both can efficiently dissolve out phosphorus, can also reduce the dissolution of iron.Malic acid-
HNO3With modification steel slag liquid-solid ratio preferably 200~300:1 (mL:g) takes into account phosphorus dissolution rate under this liquid-solid ratio to mixed solution
While, it can also be improved the fertilizer efficiency of liquid fertilizer.
3. beneficial effect
Compared with the prior art, the invention has the benefit that
(1) a kind of method using converter slag production faintly acid liquid fertilizer of the invention, it is readily soluble according to phosphorus in steel slag
In plant root secretion citric acid the characteristics of, utilize malic acid-HNO3Mixed solution carries out wet process to steel slag as leachate
Processing, obtains based on phosphorus, simultaneously the faintly acid liquid fertilizer containing nutrients such as calcium, silicon, iron, potassium, magnesium, nitrogen；This liquid
The production and application of body fertilizer can alleviate China's soil significantly and lack phosphorus status and the dependence to rock phosphate in powder, reduce slightly solubility in soil
The content of phosphorus improves the utilization efficiency of phosphorus；And malic acid-HNO3The nitric acid of mixed solution can inhibit while leaching phosphorus
The dissolution of iron；In addition, the ammonium hydroxide that can also be added with the later period forms the nitrogenous compounds such as ammonium nitrate using nitric acid；
(2) a kind of method using converter slag production faintly acid liquid fertilizer of the invention, used steel slag is to turn
The steel slag that furnace duplex technique generates, the P in the steel slag2O5For content 10% or more, phosphor resource is abundant；Using in biomass slag
Potassium base component carries out modifying process to converter slag, and phosphorus is in steel slag mainly with 2CaOSiO after modifying process2-2CaO·
K2O·P2O5Form exist, and the production quantity of phosphorous solid solution increases, and the solvability of sylvite in aqueous solution is higher, changes
2CaOSiO obtained from matter2-2CaO·K2O·P2O5Solid solution may advantageously facilitate the dissolution of phosphorus, and phosphorus dissolution rate can in steel slag
Up to 90% or more；In addition, steel slag is in malic acid-HNO3Potassium, calcium, magnesium, silicon, iron etc. can be also dissolved out in mixed solution simultaneously and promotes agriculture
The nutrient of plant growth, P elements needed for liquid fertilizer can supplement rapidly crops after being manured into soil and other are micro
Element, each material utilization is high, and the faintly acid liquid containing organic acid can be mentioned with insoluble phosphorus in activating soil, potassium nitrate etc.
High plant absorption efficiency and offer potassium element；
(3) a kind of method using converter slag production faintly acid liquid fertilizer of the invention, preparation raw material are at low cost
It is honest and clean, solution ph is controlled using pH automatic control system, it is easy to operate, in addition, using weakly acidic malic acid-HNO3It mixes molten
Liquid, leaching process is lower to equipment requirement, avoids using a series of costs of strong acid treatment bring and problem of environmental pollution；
(4) a kind of method using converter slag production faintly acid liquid fertilizer of the invention, the metallurgical industry of use turn
Furnace steel slag and the biomass lime-ash of power industry are raw material, using organic acid and inorganic acid mixed solution to modification steel slag biology
Matter ash mixture carries out leaching process, obtains faintly acid filtrate and dephosphorization tailings, and faintly acid filtrate can be by repeatedly circulation leaching
Ammonia spirit adjustment acid-base property and ingredient are added after being used for multiple times, obtains faintly acid Liquid Fertilizer for steel slag out, save the cost, filtrate
Material is used for agricultural production, handles filtrate using ammonia spirit, ammonia spirit first is weakly alkaline solution, adjustable filtrate soda acid
Degree, keeps filtrate weakly acidic, in addition, contain ammonium ion in ammonia spirit, can be formed with the ion in filtrate monoammonium phosphate,
Diammonium phosphate (DAP), ammonium nitrate etc. are conducive to the ingredient of plant growth needs, in addition, the tailings after leaching process can return to metallurgical process
It recycles, therefore, the present invention realizes the high value added utilization of valuable element in Industrial Solid Waste, avoids a series of cost
And problem of environmental pollution, there is preferable energy economy & environment benefit.
Detailed description of the invention
Technical solution of the present invention is described in further detail below with reference to drawings and examples, but should
Know, these attached drawings are designed for task of explanation, therefore not as the restriction of the scope of the invention.In addition, except non-specifically
It points out, these attached drawings are meant only to conceptually illustrate structure construction described herein, without to be drawn to scale.
Fig. 1 is the flow chart of the method for the invention that faintly acid liquid fertilizer is produced using converter slag.
Specific embodiment
Hereafter to the detailed description of exemplary embodiment of the present invention with reference to attached drawing, which forms one of description
Point, it has been shown as example enforceable exemplary embodiment of the invention in the figure.Although these exemplary embodiment quilts
Sufficiently describe in detail so that those skilled in the art can implement the present invention, it is to be understood that can realize other embodiments and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to the embodiment of the present invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature to propose to execute best mode of the invention, and is sufficient to make those skilled in the art
It can implement the present invention.Therefore, the scope of the invention is only defined by the appended claims.
Hereafter detailed description of the present invention and example embodiment are more fully understood in combination with attached drawing.
Electric mixer used in following all examples is electric up-down blender mainly by water-bath sink, control plane
Plate and liftable stirring-head composition are equipped with temperature detect switch (TDS), lifter switch, stirring switch.Bath temperature can reach 100 DEG C,
Revolving speed reaches as high as 2000 revs/min, be additionally provided with can the self-setting time time switch.In use, beaker is put into sink,
Stirring-head is fallen, mixing speed is set, presses the operation key on control panel, blender will be according to the mixing speed of setting
At the uniform velocity stir the solution in beaker.
Embodiment 1
Steel slag caused by the converter duplex technique of certain steel mill production H profile steel is chosen, a kind of of the present embodiment utilizes converter
The method that steel slag produces faintly acid liquid fertilizer, flow chart is as shown in Figure 1, specifically comprise the following steps:
(1) 2mm rice lime-ash below is added into molten steel slag when slagging tap, the grey quantity of slag is 30mass%；
(2) the insulation reaction 90min at 1823K；
(3) control cooling velocity is 3K/min, is slowly dropped to room temperature；
It (4) is 75~150 μm by the slag specimen partial size of cooling modification slag crushing grinding screening；
(5) malic acid-HNO that secure ph is 53Mixed solution 400mL is added in beaker, certainly by SC-200A pH
Dynamic control liquid feeding system controls solution acid-basicity；
(6) the steel slag 1g for taking step (4) to sieve is put into the malic acid-HNO of step (5) preparation3In mixed solution, to steel slag
Leaching process is carried out, control extraction temperature is 298K, and extraction time 90min, electric mixer speed of agitator is 300r/min；
(7) mixed liquor after step (6) leaching process is separated by solid-liquid separation, obtains filtrate and dephosphorization steel slag；
(8) the phosphorous filtrate of step (7) is continued cycling through for leaching next group modification converter slag, filtrate cycle utilizes
After 15 times, ammonium hydroxide is added into filtrate and adjusts filtrate acid-base property, obtains the faintly acid liquid fertilizer of pH=6.5；
(9) the dephosphorization steel slag of step (7) metallurgical process is returned to recycle after being dried.
Embodiment 2
Steel slag caused by the converter duplex technique of certain steel mill production Automobile Plate is chosen, a kind of of the present embodiment utilizes converter
The method that steel slag produces faintly acid liquid fertilizer, specifically comprises the following steps:
(1) 2mm rice lime-ash below is added into molten steel slag when slagging tap, the grey quantity of slag is 20mass%；
(2) the insulation reaction 60min at 1823K；
(3) control cooling velocity is 4K/min, is slowly dropped to room temperature；
It (4) is 45~48 μm by the slag specimen partial size of cooling modification slag crushing grinding screening；
(5) malic acid-HNO that secure ph is 5.53Mixed solution 500mL is added in beaker, passes through SC-200A pH
Liquid feeding system is automatically controlled to control solution acid-basicity；
(6) the steel slag 1g for taking step (4) to sieve is put into the malic acid-HNO of step (5) preparation3In mixed solution, to steel slag
Leaching process is carried out, control extraction temperature is 323K, and extraction time 120min, electric mixer speed of agitator is 300r/
min；
(7) mixed liquor after step (6) leaching process is separated by solid-liquid separation, obtains filtrate and dephosphorization steel slag；
(8) the phosphorous filtrate of step (7) is continued cycling through for leaching next group modification converter slag, filtrate cycle utilizes
After 10 times, ammonium hydroxide is added into filtrate and adjusts filtrate acid-base property, obtains the faintly acid liquid fertilizer of pH=6.5；
(9) the dephosphorization steel slag of step (7) metallurgical process is returned to recycle after being dried.
Embodiment 3
Steel slag produced by the double slag techniques of converter of certain steel mill's production flow line steel is chosen, a kind of of the present embodiment utilizes converter steel
The method that slag produces faintly acid liquid fertilizer, specifically comprises the following steps:
(1) 2mm rice lime-ash below is added into molten steel slag when slagging tap, the grey quantity of slag is 20mass%；
(2) the insulation reaction 80min at 1783K；
(3) control cooling velocity is 3K/min, is slowly dropped to room temperature；
It (4) is 45~48 μm by the slag specimen partial size of cooling modification slag crushing grinding screening；
(5) malic acid-HNO that secure ph is 63Mixed solution 400mL is added in beaker, certainly by SC-200A pH
Dynamic control liquid feeding system controls solution acid-basicity；
(6) the steel slag 1g for taking step (4) to sieve is put into the malic acid-HNO of step (5) preparation3In mixed solution, to steel slag
Leaching process is carried out, control extraction temperature is 303K, and extraction time 60min, electric mixer speed of agitator is 300r/min；
(7) mixed liquor after step (6) leaching process is separated by solid-liquid separation, obtains phosphorous filtrate and dephosphorization steel slag；
(8) the phosphorous filtrate of step (7) is continued cycling through for leaching next group modification converter slag, phosphorous filtrate cycle
After 20 times, ammonium hydroxide is added into filtrate and adjusts filtrate acid-base property, obtains the faintly acid liquid fertilizer of pH=6.5；
(9) the dephosphorization steel slag of step (7) metallurgical process is returned to recycle after being dried.
Embodiment 4
Steel slag produced by the double slag techniques of converter of certain steel mill's production flow line steel is chosen, a kind of of the present embodiment utilizes converter steel
The method that slag produces faintly acid liquid fertilizer, specifically comprises the following steps:
(1) 2mm rice lime-ash below is added into molten steel slag when slagging tap, the grey quantity of slag is 40mass%；
(2) the insulation reaction 60min at 1823K；
(3) control cooling velocity is 3K/min, is slowly dropped to room temperature；
It (4) is 75~150 μm by the slag specimen partial size of cooling modification slag crushing grinding screening；
(5) malic acid-HNO that secure ph is 63Mixed solution 200mL is added in beaker, certainly by SC-200A pH
Dynamic control liquid feeding system controls solution acid-basicity；
(6) the steel slag 1g for taking step (4) to sieve is put into the malic acid-HNO of step (5) preparation3In mixed solution, to steel slag
Leaching process is carried out, control extraction temperature is 308K, and extraction time 90min, electric mixer speed of agitator is 300r/min；
(7) mixed liquor after step (6) leaching process is separated by solid-liquid separation, obtains phosphorous filtrate and dephosphorization steel slag；
(8) the phosphorous filtrate of step (7) is continued cycling through for leaching next group modification converter slag, phosphorous filtrate cycle
After 15 times, ammonium hydroxide is added into filtrate and adjusts filtrate acid-base property, obtains the faintly acid liquid fertilizer of pH=6.7；
(9) the dephosphorization steel slag of step (7) metallurgical process is returned to recycle after being dried.
Below with reference to pot experiment of the invention, illustrate the application effect of fluid present invention fertilizer.
The present invention selects the protection band arable layer mellow soil of certain university's long term experiment land used.Test basin diameter 24cm,
High 25cm, every basin dress wind desiceted soil (crossing 2mm sieve) 5kg.Test situation of the present invention is as follows: soil does not apply phosphate fertilizer (A)；Soil only applies
Phosphate fertilizer (calcium superphosphate 0.20g/kg-1)(B)；The liquid phosphate fertilizer under 300mL different conditions, embodiment 1 are applied in soil respectively
(C), embodiment 2 (D), embodiment 3 (E), embodiment 4 (F).Every processing is repeated 10 times.Select the full consistent jade of same kind
Rice seed after disinfection cleaning, is dark vernalization 2d in 25 DEG C/20 DEG C incubators in day night temperature, selects the consistent seed that shows money or valuables one carries unintentionally and broadcast
Kind, every basin broadcasts 6,3 plants of final singling, is placed in the solarium of natural lighting and cultivates.Seedling it is long to two leaves wholeheartedly after every 15d pass through position
Water injection pipe in basin center pours the liquid phosphate fertilizer of 300mL into soil respectively, and A and B pour the clear water of 300mL respectively.Jointing stage, pumping
The biomass and fractional yield of male phase and the fresh sample measurement analysis corn of maturity period plant the results are shown in Table 2.
2 jointing stage of table, the biomass of tasseling stage and the fresh sample measurement analysis corn of maturity period plant and fractional yield
As shown in table 2, added compared with A, in soil liquid phosphate fertilizer of the invention be remarkably improved it is low-phosphorous under the conditions of corn
Biomass；In jointing stage, tasseling stage and maturity period, the biomass of C, D, E, F processing is all remarkably higher than A.Meanwhile with the corn of B
Grain yield is 100, then the yield of A, C, D, E, F processing is respectively 52.52,92.78,88.55,81.86 and 93.73.This says
It is bright apply liquid phosphate fertilizer of the invention can significantly improve it is low-phosphorous under the conditions of corn yield, and reach the production of normal Phosphorus-supplying Level
80% or more of amount.
Claims (10)
1. a kind of method using converter slag production faintly acid liquid fertilizer, which is characterized in that including with biomass lime-ash pair
It melts converter slag and carries out modifying process, then converter slag pulverizing and jevigating will be modified, malic acid-is added in levigate converter slag
HNO3In mixed solution, stirring dissolves out the valuable element in converter slag, and ammonia spirit, adjustment filter are finally added into filtrate
Liquid acid-base property obtains faintly acid liquid fertilizer.
2. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 1, which is characterized in that
Biomass lime-ash is added in the melting converter slag, modifying process is carried out to steel slag, specifically comprises the following steps:
(1) to melting converter slag in be added 2mm biomass lime-ash below, at 1723~1823K insulation reaction 60min~
After 90min, converter slag is slowly dropped to room temperature；
(2) cooling modification converter slag crushing grinding is sized to certain partial size, is used for wet-leaching.
3. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 2, which is characterized in that
It is 20~40mass% that the biomass ash quantity of slag, which is added, in the step (1), and it is 3~5K/min that converter slag, which controls cooling velocity,.
4. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 2, which is characterized in that
The converter slag slag specimen partial size of step (2) screening is 45~150 μm.
5. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 2, which is characterized in that
The lime-ash that the step (1) is added is power plant burning rice straw, biomass ash caused by corn stover or wheat stalk
Slag.
6. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 4, which is characterized in that
The converter slag slag specimen partial size of the screening is 45~48 μm.
7. according to a kind of described in any item methods using converter slag production faintly acid liquid fertilizer of claim 2 to 6,
It is characterized in that, malic acid-HNO is added in the modification converter slag of screening3Leaching in mixed solution, reaction solution is filtered,
Backward filtrate in be added ammonia spirit adjust solution acid-basicity, obtain faintly acid liquid fertilizer, specific steps are as follows:
(1) malic acid-HNO that secure ph is 5~63Mixed solution is as leachate, malic acid and HNO3Mixed proportion is 2:
1, liquid feeding system is automatically controlled by SC-200A pH, solution acid-basicity is controlled；
(2) malic acid-HNO prepared with step (1)3Mixed solution carries out leaching process to modification steel slag, wherein malic acid-
HNO3The extraction temperature that mixed solution handles steel slag is 298~323K, and extraction time is 60~150min, the malic acid-HNO3
Mixed solution and the steel slag liquid-solid ratio of the screening are 150~400mL:1g, speed of agitator 300r/min；
(3) mixed liquor after step (2) leaching process is separated by solid-liquid separation, obtains filtrate and tailings；
(4) filtrate described in step (3) is continued cycling through for leaching next group modification converter slag, faintly acid filtrate cycle benefit
After 10~20 times, ammonium hydroxide is added into filtrate and adjusts filtrate acid-base property, obtains faintly acid liquid fertilizer；
(5) dephosphorization tailings returns to metallurgical process after being dried and recycles.
8. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 7, which is characterized in that
Malic acid-the HNO that the step (1) is prepared3Mixed solution pH value is 5.5~6.
9. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 8, which is characterized in that
Step (2) extraction temperature is 303~308K, and extraction time is 90~120min.
10. a kind of method using converter slag production faintly acid liquid fertilizer according to claim 8, feature exist
In step (2) malic acid-HNO3The liquid-solid ratio of mixed solution and the steel slag of the screening is 200~300mL:1g.
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