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Material for phosphate fertilizer and for producing thereof

A technology for phosphate fertilizer and raw materials, which is applied in the directions of phosphate fertilizer granulation/granulation, phosphate fertilizer, inorganic fertilizer, etc., can solve the problems of reduced concentration of molten iron P, insoluble phosphoric acid, and inability to obtain fertilizer characteristics, and achieves low cost and high dephosphorization. The effect of efficiency

Inactive Publication Date: 2004-06-30
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] However, in order to obtain slag with high phosphoric acid concentration in these prior art, additional special steps are required, and there is a problem that the cost of dephosphorization treatment and recovery of slag becomes high. In addition, since the above-mentioned technologies of ① and ② are based on the premise of increasing the P concentration of molten iron, Sometimes it is difficult to reduce the concentration of P in molten iron after dephosphorization treatment to a specified level
In addition, it has also been recognized that even if the phosphoric acid in the slag is made to have a high concentration using these prior art techniques, the phosphoric acid contained in it is difficult to dissolve in many cases, so that sufficient fertilizer properties expected in terms of the phosphoric acid concentration cannot be obtained.

Method used

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  • Material for phosphate fertilizer and for producing thereof
  • Material for phosphate fertilizer and for producing thereof
  • Material for phosphate fertilizer and for producing thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0231] A 300t converter is used for dephosphorization reaction treatment of blast furnace molten iron. In this dephosphorization reaction treatment, after the molten iron is loaded into the converter, a specified amount of CaO source is added, and oxygen blowing is carried out from the top blowing lance. In addition, dephosphorization reaction treatment was performed for the same treatment time in both the examples of the present invention and the comparative examples.

[0232] In the comparative example, the molten iron after tapping does not carry out desiliconization treatment, but implements dephosphorization reaction treatment. Desiliconization: Desiliconization treatment is performed to reduce the Si content to 0.07% by mass or less, and then dephosphorization reaction treatment is performed. In the example of the present invention, CaF is not added 2 .

[0233]Table 2 shows the dephosphorization reaction treatment conditions and the composition of the produced slag. ...

Embodiment 2

[0236] The molten iron tapped from the blast furnace is desiliconized in the casting house and in the ladle as needed, desulfurized in the ladle by mechanical stirring, and dephosphorized in a 250-ton converter. The temperature of the molten iron before and after the dephosphorization reaction is 1250-1350°C. The source of CaO is quicklime mainly CaO, and the sieve with a particle size below 200 mesh is used. According to the difference of Si concentration in the molten iron, the unit consumption of CaO is 5~15kg / ton of molten iron.

[0237] Such as Figure 10 As shown, in this dephosphorization reaction treatment, the CaO source is sprayed onto the bath surface through a top blowing lance with oxygen as the carrier gas, and the CaO source and the oxygen source are supplied (blowing time: 10 minutes). Speed ​​A (Nm 3 / min / ton of molten iron) and the ratio A / B of the CaO source supply rate B (kg / min / ton of molten iron) are operated under various conditions. In addition witho...

Embodiment 3

[0245] The molten iron tapped from the blast furnace is desiliconized in the casting house and in the ladle as needed, desulfurized in the ladle by mechanical stirring, and dephosphorized in a 250-ton converter. The temperature of the molten iron at the end of the dephosphorization reaction treatment is 1360-1450° C., the CaO source is quicklime mainly CaO, and the undersieve with a particle size of 200 mesh or less is used.

[0246] Such as Figure 10 As shown, in this dephosphorization reaction treatment, the oxygen supply rate A (Nm 3 / min / ton of molten iron) and CaO source supply rate B (kg / min / ton of molten iron) ratio A / B satisfies the condition of 0.3-7 to supply CaO source and oxygen source (blowing time: 10 minutes). In addition without adding CaF 2 .

[0247] Nitrogen as a stirring gas is 0.05-0.15Nm 3 / min / ton The flow rate of molten iron is sprayed from the bottom blowing nozzle at the bottom of the furnace to the molten iron.

[0248] Table 4 shows the compos...

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Abstract

Provided is a raw material for phosphate fertilizer having excellent fertilizer characteristics, which raw material consists essentially of a slag containing phosphate generated from dephosphorization reaction in molten iron, and is a method for manufacturing the raw material suitable for manufacturing the phosphate fertilizer. The raw material for phosphate fertilizer consists essentially of a slag containing phosphate generated from dephosphorization reaction in molten iron. As for the slag composition, the phosphate content satisfies the formula (1), and preferably the formula (2): [P2O5]>=5.6x[F]+7 (1) [P2O5]>=5.6x[F]+10 (2) where, [P2O5] is the phosphate content in slag, (mass %) and [F] is the fluorine content in slag, (mass %). The method for manufacturing the raw material thereof is a method of charging an oxygen source and a CaO source to a molten iron which decreases the Si concentration therein to a sufficient level, thus inducing the dephosphorization reaction in the molten iron, or a method of charging a CaO source and a gas oxygen in respective specified configurations and conditions to the molten iron, thus inducing the dephosphorization reaction in the molten iron.

Description

technical field [0001] The present invention relates to a raw material for phosphate fertilizer consisting of slag containing phosphoric acid produced in a dephosphorization reaction of molten iron, and a method for producing the same. Background technique [0002] At present, phosphate rock is mostly used as a raw material for the production of phosphate fertilizer raw materials, and the supply of phosphate rock as a raw material may be urgent in the future. On the other hand, it is necessary to effectively utilize the slag recovered in the iron and steel production process, so in recent years extensive research has been carried out on the use of slag containing phosphoric acid as a raw material for phosphate fertilizer. Considering that the phosphoric acid contained in the slag is insoluble in water, it is suitable to be used as a generalized environment-friendly agricultural slow-acting fertilizer. [0003] A well-known phosphate fertilizer using slag as a raw material i...

Claims

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Application Information

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IPC IPC(8): C05B5/00C05B19/00C05D3/04
CPCC05D3/04C05B19/00C05B5/00
Inventor 高桥达人田边治良八尾泰子井上茂渡边圭儿矶尾典男小平悟史川畑凉白山章松野英寿村井刚
Owner JFE STEEL CORP
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