WO2003037824A1 - Matiere premiere pour fertilisant de phosphate de silicate et son procede de production - Google Patents

Matiere premiere pour fertilisant de phosphate de silicate et son procede de production Download PDF

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Publication number
WO2003037824A1
WO2003037824A1 PCT/JP2002/011133 JP0211133W WO03037824A1 WO 2003037824 A1 WO2003037824 A1 WO 2003037824A1 JP 0211133 W JP0211133 W JP 0211133W WO 03037824 A1 WO03037824 A1 WO 03037824A1
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WIPO (PCT)
Prior art keywords
slag
raw material
phosphate fertilizer
hot metal
silicate
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PCT/JP2002/011133
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English (en)
Japanese (ja)
Inventor
Yasuko Yao
Keiji Watanabe
Tatsuhito Takahashi
Shigeru Inoue
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Jfe Steel Corporation
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Publication date
Application filed by Jfe Steel Corporation filed Critical Jfe Steel Corporation
Priority to KR10-2003-7008638A priority Critical patent/KR20040060838A/ko
Priority to BR0206555-0A priority patent/BR0206555A/pt
Publication of WO2003037824A1 publication Critical patent/WO2003037824A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B5/00—Thomas phosphate; Other slag phosphates

Definitions

  • the present invention relates to a raw material for silicate phosphate fertilizer and a method for producing the same.
  • Silicic fertilizer is a fertilizer mainly intended to supply silicic acid to paddy rice, and generally contains soluble silicic acid of 10 nmss% or more, and is used in large quantities as a soil preservative for paddy fields and as a soil modifier for aging paddy fields. ing.
  • silicic fertilizers have been attracting attention for their ability to strengthen plants and make them less susceptible to pests and insects. They have been used not only for paddy rice but also for vegetables such as cucumber.
  • siliceous fertilizers are also produced from wollastonite, a natural resource, many siliceous fertilizers are now produced from blast furnace slag.
  • An object of the present invention is to provide a raw material for silicic acid phosphate fertilizer which contains an appropriate amount of phosphoric acid, has excellent dissolution characteristics of silicic acid, and can be produced at low cost.
  • Another object of the present invention is to provide a method for producing a raw material for a silicate phosphate fertilizer which is suitable for obtaining the raw material for a silicate phosphate fertilizer.
  • Another object of the present invention is to provide a silicate phosphate fertilizer using the raw material for the silicate phosphate fertilizer and a method for producing the same.
  • the present inventors have repeated studies on raw materials for silicate phosphate fertilizers that meet the above requirements in terms of fertilizer composition and production cost, and as a result, specific slag collected in the hot metal pretreatment process of blast furnace hot metal It has been found that it is extremely suitable as a raw material for phosphate fertilizer, can be used as a raw material for silicate phosphate fertilizer without any special treatment, and has excellent properties as a fertilizer. Among them, it was found that slag having a specific basicity, more preferably slag obtained under specific cooling conditions, exhibited particularly excellent performance as a fertilizer.
  • the raw material for silicate phosphoric acid fertilizer provided by the present invention is slag collected in the hot metal pretreatment process of blast furnace hot metal, A phosphoric acid fertilizer material comprising slag containing at least 10 nmss% of soluble silicic acid.
  • the slag which is a raw material for the silicic acid phosphate fertilizer, preferably contains 2 mass% or more of soluble citric acid in order to enhance the dissolving properties of the silicic acid and obtain the fertilizing effect of the phosphoric acid.
  • Such slag can be obtained from the hot metal pretreatment process in that the raw material for silicate phosphate fertilizer can be obtained without adding special treatment as in the prior art. It is preferable to use phosphorus slag.
  • the slag which is a raw material for the silicate phosphate fertilizer, has a basicity (Ca OZ S i 0 2 ) of 1.5 to 2.5 in terms of the dissolution characteristics of silicic acid and the dephosphorization efficiency in the hot metal dephosphorization step. It is preferred that
  • the temperature range of 130 to 100 ° C is cooled at a cooling rate of less than 100 ° CZ minutes. Slag obtained in this way is preferable because excellent powderability of the slag can be obtained.
  • the temperature range of at least 130 to 100 is set to 1 Slag obtained by cooling at a cooling rate of at least 100 ° C. is preferable because a particularly high silicic acid solubility can be obtained.
  • the slag which is a raw material of the above silicate phosphate fertilizer, has as low a fluorine content as possible in order to increase the content of the soluble phosphoric acid as much as possible, and in particular, that the slag is substantially free of fluorine. That is, it is most preferable not to include fluorine other than fluorine inevitably mixed in the slag generation step.
  • the raw material for the silicate phosphate fertilizer is used as it is as a silicate phosphate fertilizer or as a main raw material of a silicate phosphate fertilizer. Accordingly, the present invention provides such a silicate-phosphate fertilizer.
  • the raw material for silicate phosphate fertilizer is a silicate phosphate fertilizer
  • the above raw material for silicate phosphate fertilizer is preferably converted to silicate phosphate fertilizer through a granulation step using an appropriate binder.
  • Silicate phosphate fertilizers are less likely to cause problems such as splashing during fertilization, runoff due to rainwater, and impaired ground permeability and air permeability.
  • the shape is regular and spherical Because it is close to and not square, it is easy to handle.
  • a Ca source and an oxygen source are added to the hot metal to cause an oxidation reaction of silicon in the hot metal and a dephosphorization reaction of the hot metal.
  • the slag having a basicity (CaO / Si02) of 1.5 to 2.5 is recovered and solidified as a raw material for a silicate phosphate fertilizer. Production method.
  • the recovered slag is solidified by cooling at least a temperature range of 130 to 100 at a cooling rate of less than 100 ° CZ.
  • the recovered slag is heated to a temperature range of at least 130 to 100 ° C for at least 100 ° CZ or more.
  • a silicate phosphate fertilizer is produced using the raw materials for the silicate phosphate fertilizer obtained by each of the above production methods. Accordingly, the present invention provides a method for producing such a silicate-phosphate fertilizer. In this case, it is preferable that a crushing and / or sizing step of the raw material for silicate phosphate fertilizer and a granulation step to which a binder is added are performed.
  • the raw material for silicic acid fertilizer of the present invention as described above is produced by the action of the phosphoric acid contained. It has excellent dissolving properties of silicic acid, and it is easy to be absorbed by plants, and phosphoric acid itself also works as a fertilizing component, so there is no need to separately apply fertilizing phosphoric acid or the amount of fertilizing can be reduced. It has excellent properties and can be used at very low cost because slag recovered in the hot metal pretreatment can be used as it is. Further, according to the method for producing a raw material for a silicate phosphate fertilizer of the present invention, a raw material for a silicate phosphate fertilizer having such excellent characteristics can be stably and inexpensively produced. BRIEF DESCRIPTION OF THE FIGURES
  • Figure 1 is a graph showing the relationship between the basicity of hot metal dephosphorization slag and the solubility of silicic acid.
  • Figure 2 is a graph showing the relationship between the basicity of hot metal dephosphorization slag and the content of soluble silicic acid.
  • FIG. 3 is a graph showing the relationship between the basicity of the slag that has been slowly cooled after being recovered and the powderability during cooling.
  • FIG. 4 is an explanatory view showing an example of a granulating step of a raw material for a silicate phosphate fertilizer of the present invention.
  • FIG. 5 is an explanatory view showing another example of the granulating step of the raw material for silicate phosphate fertilizer of the present invention.
  • the raw material for silicate phosphoric acid fertilizer of the present invention is slag recovered in a hot metal pretreatment step of blast furnace hot metal, comprising silicate which is an oxide of silicon in the hot metal and phosphoric acid which is an oxide of phosphorus. And slag containing 10 mass% or more of soluble silicic acid.
  • the soluble silicic acid refers to a silicic acid soluble in a 0.5 mol hydrochloric acid solution
  • the sulfur-soluble phosphoric acid refers to a phosphoric acid soluble in a 2% citric acid solution (pH 2).
  • the analysis The method complies with the fertilizer analysis method (Agriculture and Environment Technology Research Institute Act of the Ministry of Agriculture, Forestry and Fisheries).
  • hot metal dephosphorized slag recovered in the deblasting process of blast furnace hot metal is preferable.
  • This hot metal dephosphorization slag usually contains not less than 1011% of soluble silicic acid, an appropriate amount of phosphoric acid (usually, dissolvable phosphoric acid: not less than 2 ma SS %), and further contains calcium (usually, CaO: 2). It also contains iron (more than 5 mass%) and iron (usually T. Fe: more than 1.5 mass%).
  • the slag used as the raw material for the silicic acid phosphate fertilizer contains soluble silicic acid in an amount of 1 Omass% or more, preferably 20 mass% or more. Moreover, the slag than 2mass% of click-soluble phosphate to obtain a fertilizer effect by and phosphate enhances the solubility characteristics of the silicate, it is desirable that preferably contains 3 ma SS% or more.
  • hot metal de-slag contains silicic acid and phosphoric acid, and both the solubility of silicic acid and the dissolution rate of phosphoric acid are 70% or more, so that soluble silicic acid is 10 mass% or more, and soluble phosphoric acid is 2%. Contains at least nmss% and has excellent dissolution characteristics as a fertilizer.
  • slag used as a raw material for silicate phosphate fertilizers preferably has a high soluble silicic acid content.
  • slag particularly, hot metal It was found that suitable conditions exist for the basicity (C a OZS i 0 2 ) of the dephosphorized slag and the cooling rate of the slag after recovery.
  • Fig. 2 shows the results of Fig. 1 organized by the content of soluble silicic acid in the slag.
  • those obtained by gradually cooling the recovered slag have a slag basicity of about 1.0 or more and a silicic acid solubility of about 80%.
  • the quenched recovered slag has a slag basicity of about 1.0 or more and a silica solubility of about 95% or more.
  • a soluble silicic acid content of about 15 mass% or more.
  • the recovered slag in order to obtain the effect shown in FIGS. 1 and 2 by quenching, the recovered slag must be at least 130 ° C. to 100 ° C., preferably. It was found that cooling (rapid cooling) should be performed at a cooling rate of 100 / min or more, preferably 200 ° C. / or more, in a temperature range of 140 to 950, preferably 200 ° C./min.
  • This cooling rate of slag of 100 ° C / min or more can be said to be a sufficiently high cooling rate compared to the normal cooling state of slag (gradual cooling).
  • the specific method for rapidly cooling the collected slag at the above-mentioned cooling rate in the above-mentioned specific temperature range is not particularly limited.
  • the generated slag is blown with low-pressure air to be scattered, Cooling and granulating (air crushing method), high pressure water Spraying, scattering, cooling and granulating (water granulation method), desiliconization slag generated on the thick steel plate, flowing out, and forced cooling by the thick steel plate and cooling by heat radiation to the air. Either method may be used.
  • slow cooling which is a normal cooling mode
  • slag is generally received in a slag pot and then discharged to a slag processing plant.
  • Figs. 1 and 2 The relationship between the slag basicity and the silicic acid solubility and soluble silicic acid content is shown in Figs. 1 and 2, and the desired silicic acid solubilization ratio is less than 1.5 and more than 2.5.
  • the slag basicity is particularly preferably in the range of 1.5 to 2.5.
  • the slag will pulverize (collapse) when cooled, and must be crushed when it is turned into fertilizer. There is an advantage that it can be reduced or omitted. This will volume expansion by transformation upon 2 C A_ ⁇ ⁇ S i 0 2 in the slag component (Dicalcium silicate) is cooled (slowly cooled), thereby because the slag is pulverized.
  • Figure 3 shows the relationship between the basicity of slag and the powdering property during cooling (powdering index) of the recovered slag that was gradually cooled at a cooling rate of less than 100 ° C. Indicates the percentage (mass%) of particles of 5 mm or less when the cooled slag is passed through a 65 mm sieve. According to Fig. 3, a high powdering index is obtained when the slag basicity of the slowly cooled slag is in the range of 1.5 to 2.5. On the other hand, less slag basicity 1.5, 2. the amount of 2 C a ⁇ ⁇ S i 0 2 except compounds in the 5 greater range multi no longer, 2 ratio of C a O 'S i 0 2 is Due to the decrease, the powderability decreases.
  • the hot metal de-slag has as little F content as possible, and preferably contains substantially no F (ie, except for the F contained as an unavoidable impurity, the F derived from the dephosphorizing agent). Is not included).
  • insoluble compounds fluorine apatite C a 5 (P0 4) 3 F
  • silicon Cano tie bets 5 C a O. P 2 0 Since 5 ⁇ S i 0 2 ) or nagelschmitite (7C a O'P 2 0 5 '2 S i 0 2 ) increases, the proportion of potassium-soluble phosphoric acid increases.
  • the raw material for silicate phosphate fertilizer of the present invention described above can be used as it is or after crushing (crushing) treatment and grain size adjustment (particle size adjustment). Further, the raw material for silicate phosphate fertilizer, particularly, the raw material for silicate phosphate fertilizer that has been subjected to crushing treatment or sizing, is preferably converted into silicate phosphate fertilizer through a granulation step using a suitable binder. Silicate phosphate fertilizers are unlikely to cause problems such as scattering during fertilization, runoff due to rainwater, and impaired water permeability and air permeability of the ground. Also, the shape is regular and Since it is almost spherical and not square, it is easy to handle.
  • additive components may be blended with the raw material for silicate phosphate fertilizer of the present invention to obtain a silicate phosphate fertilizer.
  • the raw material for the silicate phosphate fertilizer of the present invention is made of hot metal dephosphorized slag, a preferable production method will be described.
  • Hot metal dephosphorization slag is slag produced by dephosphorization of blast furnace hot metal.
  • This dephosphorization is performed by adding a lime source and an oxygen source as dephosphorizing agents to hot metal.
  • a lime source Normally, quick lime is used as a lime source, but it is not limited to this.
  • the oxygen source a gaseous oxygen source (oxygen gas or oxygen-containing gas) and / or a solid oxygen source (for example, iron ore, iron oxide such as mill scale) are used. Further, it is preferable to use those which do not contain a C a F 2 substantially as dephosphorization agent as previously described.
  • the amount of the dephosphorizing agent to be added is determined according to the phosphorus concentration in the hot metal before the treatment, the target phosphorus concentration after the treatment, and the above-mentioned preferable slag basicity.
  • the container for dephosphorization is usually performed using a ladle-type container such as a hot metal ladle, a topped car, or a converter-type container.
  • the dephosphorization treatment is performed on the hot metal from which the slag generated in the previous process (eg, the desiliconization process) has been separated.
  • the acid can be supplied by any method such as top blowing with an acid lance, injecting into hot metal, or bottom blowing.
  • a solid oxygen source it can be supplied into the hot metal by an arbitrary method such as injection by immersion lance and top loading.
  • dephosphorization is performed by using an acid lance when performing dephosphorization using a converter type vessel or hot metal pot, and immersion is performed when using a torpedo. Injection into hot metal by lance is common.
  • the lime source can be supplied to the hot metal by any method such as induction into the hot metal by means of an immersion lance and overhead charging. it can.
  • the injection into the hot metal by the immersion lance may be performed together with the solid oxygen source described above.
  • a lime source can be projected (sprayed) from above the hot metal bath surface using a carrier gas onto the bath surface.
  • the carrier gas nitrogen, an inert gas, or gaseous oxygen described above can be used.
  • the lime source and the oxygen source can be supplied at any position on the bath surface or in the bath.However, the lime source and the oxygen source can be supplied to the same position on the bath surface or in the bath in order to increase the dephosphorization efficiency. it can.
  • a lime source and an oxygen source were integrated into part or all of the dephosphorizing agent.
  • a FeO-CaO-based dephosphorizing agent can be used.
  • the dephosphorization treatment using a converter-type vessel produces a particularly large effect (delivery efficiency). This is because the converter-type vessel has a larger freeboard compared to a ladle or torpedo, so that the stirring power can be increased, which causes rapid slagging and P mass transfer.
  • oxygen is blown from an acid supply lance or the like.
  • the hot metal in order to further improve the dephosphorization reaction efficiency, it is preferable to agitate the hot metal with gas.
  • This gas stirring is performed by blowing an inert gas such as a nitrogen gas or an argon gas into the hot metal through, for example, an injection lance or a bottom blowing nozzle.
  • the supply amount of such a stirring gas is 0.02 N mmin Z hot metal ton or more in order to obtain sufficient bath stirring properties, and the generated FeO in the hot metal Since the rate of C reduction becomes too high, the content is preferably set to 0.3 NmVmin / hot metal ton or less.
  • the Si concentration in the hot metal before the treatment is as low as possible, and this also reduces the amount of slag. Can be.
  • the hot metal is dephosphorized, and a dephosphorization slurry of a silicate phosphoric acid fertilizer composition is placed on the hot metal. Generated.
  • the hot metal dephosphorization slag is removed from the hot metal holding vessel, cooled and solidified. Cooling and solidification may be performed when removing from the hot metal holding container, or may be performed when removing from the container after storing in the container.
  • high-pressure air is blown onto the generated hot metal dephosphorization slag to disperse and cool.
  • High-pressure water is sprayed on the hot metal dephosphorization slag to scatter it, cooled and granulated (water granulation method), and the hot metal dephosphorization slag generated on the steel plate is discharged.
  • a method of cooling by forced cooling with a thick steel plate and heat radiation to the air can be adopted.
  • hot metal dephosphorization slag which is a raw material for silicate phosphate fertilizer, can be obtained.
  • the raw material for silicate phosphate fertilizer produced as described above can be used as it is as long as the particle size is appropriate, but if the shape after cooling and solidification is a lump, crushing (crushing) After treatment and / or sizing (particle size adjustment by sieving, etc.), silicate phosphate fertilizer is obtained. In some cases, other additive components may be blended to form a silicate phosphate fertilizer.
  • pulverization can be performed using a pulverizer such as a jaw crusher, a rod mill, a blade mill, an impeller breaker, or the like.
  • the sieving may be carried out by using an optional sieving apparatus or the like, and the sizing may be carried out after the raw material for the silicate phosphoric acid fertilizer is pulverized.
  • the crushed and / or sized raw material for silicate phosphate fertilizer is preferably converted into a silicate phosphate fertilizer through a granulation step using an appropriate binder, and the silicate phosphate fertilizer thus granulated. Scattered during fertilization, runoff due to rainwater, Difficult to solve problems such as impaired temper. In addition, since the shape is regular, nearly spherical, and not square, it is easy to handle.
  • a general granulation method can be adopted.
  • a pulverized material obtained by the above-mentioned pulverization process and a binder are mixed with a mixer, and an appropriate amount of water is mixed.
  • the granules can be granulated with a granulator while adding the water, and then dried.
  • the granulator those generally used, for example, a rotating dish granulator, a rotating cylindrical granulator, etc. can be used. Those which do not fall within a predetermined particle size range after granulation can be used directly. It is preferable to adopt a continuous granulation method in which after the treatment such as contacting or pulverizing, the mixture is returned to the mixer again and reused as a part of the raw material.
  • Fig. 4 shows an example of the granulation process of the raw material for silicate phosphate fertilizer.
  • the pulverized material (raw material for silicate phosphate fertilizer) 1 obtained by the above-mentioned powder frame treatment is loaded into a hopper 2 by a shovel loader or the like.
  • the measured and crushed material 1 is supplied from a hopper 2 to a drum-type rotary granulator 4 via a conveyor 3.
  • a predetermined amount of the binder 5 stored in the container 6 is also supplied to the drum-type rotary granulator 4, and the crushed material 1 and the binder 5 are mixed by rotating the drum-type rotary granulator 4. Granulated.
  • the granulated material is dried by the drier 7, supplied to the sieving device 9 by the elevator 8, sieved, and further cooled by the cooler 10 to be granulated fertilizer.
  • the drier 7 supplied to the sieving device 9 by the elevator 8, sieved, and further cooled by the cooler 10 to be granulated fertilizer.
  • Fig. 5 shows another example of the granulation process of the raw material for silicate phosphoric acid fertilizer.
  • the crushed material 1 obtained by the above crushing treatment is charged into a hopper 12 and the weighed crushed material 1 is placed in the hopper. Charged from 1 2 to mixer 15
  • a predetermined amount of the binder 13 stored in the container 14 is also charged into the mixer 15.
  • the powdered material 1 and the binder 13 are mixed in the mixer 15, and the mixture is supplied to the dish-shaped granulator 16, and is granulated in the dish-shaped granulator 16.
  • the granules granulated by the dish granulator 16 It is placed on a belt conveyor 17, and after that, it is dried by a drier 7, supplied to a sieving device 9 by an elevator 8 and sieved as in the process of FIG. 4, and further cooled by a cooler 10 to form a granulated fertilizer. Become.
  • the binder used in the granulation process is selected from phosphoric acid, clay, bentonite, polyvinyl alcohol, carboxymethylcellulose, polyacrylic acid, molasses, lignin, magnesium sulfate, starch, etc. Species or more can be used alone or as a mixture, but starch, magnesium sulfate, and lignin are suitable from the viewpoints of granulation properties and disintegration of fertilizer particles after fertilization, and are selected from these. It is preferable to use one or more as the main component of the binder.
  • the properties required for the binder are as follows: (1) excellent granulation properties; (2) fertilizer particles after fertilization. ) Can easily disintegrate and disperse in soil, 3 have a hardness so that particles do not collapse during production and handling from distribution to fertilization, and 4 the environment in which one binder component contains soil
  • the starch, magnesium sulfate, and lignin all satisfy these characteristics.
  • starch when starch is used, the hardness of the granulated fertilizer particles is particularly high, and starch dissolves in rain or moisture in the soil to disintegrate the fertilizer particles at an appropriate speed. Particularly preferred.
  • starch is gelatinized by adding water, and then solidified by drying, so that it has excellent granulation properties, and is further degraded by soil microorganisms, which adversely affects plants and the environment. Not even.
  • starch used as a binder examples include those made from corn, tapiochi, wheat, potato, rice, and the like. Depending on the raw materials, these starches are combined with the constituent amylose (d-glucose linked in long linear form). The proportion of amylopectin (d-glucose bound in a branched manner) is different, and the proportion of amylopectin is high in waxy rice and waxy maize. Further, the type of starch may be raw starch as it is, or modified starch treated with heat, acid, alkali, salt, enzyme or the like. Regardless of their type, starch having a gelatinizing property is suitable as a granulated binder.
  • the average particle size of the silicate phosphoric acid fertilizer thus granulated is preferably 0.5 to 6 mm. If the average particle size is less than 0.5 mm, it will be blown away by the wind when fertilizer is applied, resulting in poor manageability. On the other hand, if it exceeds 6 mm, it will be difficult to spray uniformly. A more preferred particle size is 1 to 5 mm.
  • Dephosphorization treatment was performed on hot metal with a Si concentration of 0.15 mass% using a hot metal ladle to produce dephosphorized slag as a raw material for silicate phosphate fertilizer.
  • a dephosphorizing agent quick lime
  • the bath was agitated by the injection carrier gas.
  • the produced slag was recovered as raw material for silicate phosphate fertilizer.
  • the composition of these slags is shown in Table 1.
  • the raw materials for the silicic acid phosphate fertilizers of the examples all contain phosphoric acid and have a soluble silicic acid content of 10 niass% or more.
  • slag obtained by cooling (quenching) the temperature range of 130 to 100 ° C at a cooling rate of 100 ° C or more after recovery is approximately 9%.
  • Silicic acid solubility of 5% or more is obtained.
  • the slag basicity is 1 In the case of 5-2.5, good pulverizability is obtained.
  • the ratio of grains of 5mm or less when passed through a 65mm sieve is 50mass% or more.
  • the raw material for silicic acid phosphate fertilizer of the present invention comprises silicic acid which is an oxide of silicon in the hot metal and phosphoric acid which is an oxide of phosphorus, and is made of slag containing soluble silicic acid of 10 ma SS % or more. It is useful for producing silicate phosphate fertilizer having excellent fertilizer properties. Further, the method for producing a raw material for a silicate phosphate fertilizer of the present invention is useful as a method for producing a raw material for a silicate phosphate fertilizer which is inexpensive and has excellent fertilizer characteristics because the above-mentioned slag can be stably produced.

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Abstract

La présente invention concerne un fertilisant de phosphate de silicate comprenant un laitier récupéré dans un procédé de prétraitement pour une coulée de haut-fourneau contenant des silicates sous forme d'oxydes de silicium et des phosphates sous forme d'oxydes de phosphores et renfermant un acide silicique soluble dans l'acide en une quantité d'au moins 10 % en pourcentage massique. L'invention concerne également un procédé permettant la production de la matière première qui comporte l'ajout d'une source de CaO et d'une source d'oxygène à la coulée dans le processus de prétraitement pour une coulée de haut-fourneau pour réaliser l'oxydation du silicium et la déphosphoration de la fonte, et la récupération d'un laitier contenant des silicates et des phosphates formés par lesdites réactions, suivie d'une solidification, afin de produire un laitier renfermant un acide silicique soluble dans l'acide en une quantité d'au moins 10 % en pourcentage massique et également des phosphates. La matière première présente d'excellentes propriétés en tant que fertilisant, étant donné qu'elle présente d'excellentes caractéristiques de dissolution de silicates et une absorption améliorée par les plantes, due à l'effet des phosphates présents, et elle agit également en tant que fertilisant phosphaté, et il peut être produit à un coût considérablement réduit étant donné que le laitier récupéré dans un processus de prétraitement de coulée peut être utilisé tel quel.
PCT/JP2002/011133 2001-10-31 2002-10-28 Matiere premiere pour fertilisant de phosphate de silicate et son procede de production WO2003037824A1 (fr)

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KR10-2003-7008638A KR20040060838A (ko) 2001-10-31 2002-10-28 규산인산비료용 원료 및 그 제조방법
BR0206555-0A BR0206555A (pt) 2001-10-31 2002-10-28 Matéria-prima para fertilizante de silicato-fosfato e método para produção do mesmo

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RU2707811C1 (ru) * 2017-06-28 2019-11-29 Ниппон Стил Корпорейшн Сталеплавильный шлак в качестве сырья для удобрения, способ производства сталеплавильного шлака в качестве сырья для удобрения, способ производства удобрения и способ применения удобрения
CN109641810A (zh) * 2017-06-28 2019-04-16 新日铁住金株式会社 肥料原料用炼钢炉渣、肥料原料用炼钢炉渣的制造方法、肥料的制造方法及施肥方法
CN108456050A (zh) * 2018-01-24 2018-08-28 天津水泥工业设计研究院有限公司 一种低成本的生产圆颗粒矿物肥料的造粒添加剂

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JPH02277709A (ja) * 1989-04-19 1990-11-14 Kawasaki Steel Corp 溶銑予備処理スラグからの燐酸質肥料用原料回収法
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JPH11130569A (ja) * 1997-08-11 1999-05-18 Nkk Corp 緩効性カリ肥料
JPH11158526A (ja) * 1997-11-28 1999-06-15 Sumitomo Metal Ind Ltd 高ｐスラグの製造方法
JP2000226285A (ja) * 1999-02-05 2000-08-15 Nkk Corp 緩効性カリ肥料
JP2000290090A (ja) * 1999-02-05 2000-10-17 Nkk Corp 緩効性カリ肥料
JP2001261471A (ja) * 2000-01-14 2001-09-26 Nippon Steel Corp 珪酸質肥料及び珪酸質肥料の製造方法

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JPS56127717A (en) * 1980-03-11 1981-10-06 Nippon Steel Corp Steel making process discharging slag suited as phosphatic fertilizer
JPH02277709A (ja) * 1989-04-19 1990-11-14 Kawasaki Steel Corp 溶銑予備処理スラグからの燐酸質肥料用原料回収法
JPH04243992A (ja) * 1991-01-29 1992-09-01 Nippon Chem Ind Co Ltd 溶成複合肥料
JPH11130569A (ja) * 1997-08-11 1999-05-18 Nkk Corp 緩効性カリ肥料
JPH11158526A (ja) * 1997-11-28 1999-06-15 Sumitomo Metal Ind Ltd 高ｐスラグの製造方法
JP2000226285A (ja) * 1999-02-05 2000-08-15 Nkk Corp 緩効性カリ肥料
JP2000290090A (ja) * 1999-02-05 2000-10-17 Nkk Corp 緩効性カリ肥料
JP2001261471A (ja) * 2000-01-14 2001-09-26 Nippon Steel Corp 珪酸質肥料及び珪酸質肥料の製造方法

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